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ashtech ZY-12 Information Supplement

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THALES NAVIGATION
THALES NAVIGATION
www.thalesnavigation.com
www.thalesnavigation.com
Z-Xtreme
ZY-12
GPS Receiver
GPS Receiver
Information Supplement
Opern
nca
™

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Summary of Contents for ashtech ZY-12

  • Page 1 THALES NAVIGATION THALES NAVIGATION Z-Xtreme ZY-12 ™ GPS Receiver GPS Receiver Information Supplement Opern www.thalesnavigation.com www.thalesnavigation.com...
  • Page 3 (Part No. 630810-01) to cover all operating aspects of the ZY-12 GPS receiver. Chapter 1 is a copy of chapter 1 from P/N 630810-01 with two additional sections: • a Back Panel section describing the ZY-12 back panel and the pin-outs for the Power and Port X connectors •...

  • Page 5: Table Of Contents

    Table of Contents General Information ........1 Screen Summary .
  • Page 6 Screen 0 - Skysearch Information ......20 Screen 1 - Orbit Information ......22 Screen 2 - Navigation Information .

  • Page 7: General Information

    General Information This manual describes the features of the ZY-12 GPS receiver, Figure 1.1, telling you how to set up the receiver, how to collect data, and how the receiver operates. Many field procedures, such as kinematic surveying, are also described.

  • Page 8: Screen Summary

    The ZY-12 receiver is easy to operate. After you position your tripod, you need only turn the power on. Operating controls are on the front; input and output connections on the back. Screen Summary The receiver functions are accessed through various screens, as summarized in Table 1.1.

  • Page 9: Front Panel

    Front Panel The receiver front panel, Figure 1.2, includes an 8-line x 40-character backlit LCD display, and various keys for controlling the receiver and entering data. Figure 1.2. Front Panel Table 1.2 describes the keys that activate the receiver's functions. Table 1.2.

  • Page 10: Back Panel

    Or you can connect two batteries at once for long unattended observations; the receiver operates from the battery with the higher charge. Table 1.3 describes the items on the back panel. Figure 1.3. Back Panel ZY-12 GPS Receiver...
  • Page 11 1PPS BNC connector outputs a one-pulse-per-second signal synchronized with GPS time. POWER Two power connectors in parallel to apply input voltage to ZY-12 (see previ- ously) PWR OFF Toggle switch for Power Red LED Crypto not keyed...

  • Page 12: Power Connectors

    Figure 1.4. Power Connector RS-232 Connectors The RS-232 cables used with the ZY-12 receiver should mate with the female 16- pin circular connectors on the receiver (see Figure 1.5 below). Figure 1.5. RS232 Connector (Port 1, Port 2)

  • Page 13: Upgrading Firmware

    Figure 1.4 below lists pin assignments. Table 1.4. RS232 Connector Pin-Out Pin Number Description Abbreviation Ground Transmit data port A/B TXD0 Receive data port A/B RXD0 Request to send port A/B RTS0 Clear to send port A/B CTS0 Data set ready port A/B DSR0 Ground Data carrier detect port A/B...

  • Page 14: Specifications

    When it is not keyed SA will degrade the accuracy. Currently SA is not active. Zeroizing Procedure The ZY-12 is operational when keyed. The zeroizing key will put the ZY-12 into Z- tracking mode. There are two ways to zeroize: 1.

  • Page 15: Getting Started

    Getting Started Operating the Receiver Set up the receiver and start operation as described in the following procedure. 1. Connect one end of the power cable to a 10-32 VDC power source (generally a battery pack) and the other end to either of the two POWER connectors on the rear panel of the receiver (Figure 2.1).
  • Page 16 5. On Screen 0, adjust contrast by pressing the up or down key. You do not have to enter any information for your survey if the default parameters are suitable. For a static survey, accept the defaults and go to step 8. ZY-12 GPS Receiver...
  • Page 17 6. Go to Screen 4, Mode Control (Figure 2.3) where you can change operational parameters. To access Screen 4, press the [4] key. Figure 2.3. Screen 4 - Mode Control 7. The default values work very well for static surveys. However, if you choose to alter a value, press [e] to shift to data entry mode.

  • Page 18: Receiver Configuration

    Issue command 888 by pressing the [e] key, the [8] key three times, then the [e] key again. The configuration of your receiver appears on the display (Figure 2.6). You need this information when contacting Customer Support. Figure 2.6. Receiver Configuration ZY-12 GPS Receiver...

  • Page 19: Saving And Resetting User Parameters

    S/N is the serial number of the receiver. OPT is a list of option codes, as listed in Table 2.1. The order is important. A dash (-) means your receiver does not have the corresponding option. Table 2.1. Option Codes Code Installed Option D or U...

  • Page 20: Resetting Memory

    If more than 10 files are in memory, files are stored on a different "page" of the screen. To scroll through the pages of files, press the up and down arrows. When the memory is full, the receiver stops recording. Previously recorded data are not overwritten or lost. ZY-12 GPS Receiver...

  • Page 21: Closing A File

    Closing a File Files automatically close when the receiver is powered off. During data recording, you can close a file and open a new one without turning off the power: 1. From Screen 8, press [e] to shift to data-entry mode. Use the number keys, and enter [1] [2] [3].

  • Page 22: System-Level Commands

    Save user parameters Initialize (reset) RTCM Display configuration identification (information such as serial number, list of installed options, firmware version. Trigger photogrammetry on falling edge of pulse. Trigger photogrammetry on rising edge of pulse. Delete all photogrammetry pictures. ZY-12 GPS Receiver...

  • Page 23: Rtcm Differential Set Up

    RTCM Differential Set Up General To use the RTCM differential option, do the following: 1. On Screen 4, press [e] to shift to data-entry mode. 2. If the receiver is the base station, a previously surveyed antenna position must be entered in the POS line. Also, you should lower the elevation mask to about 5°.

  • Page 24: Setting Rtcm Format Type 10

    Setting RTCM Format Type 10 1. Highlight C/A code and +/- to toggle to “L1 P-code”. 2. Highlight RTCM format and press [e] to view message types. Type 10 will be displayed instead of type 1. ZY-12 GPS Receiver...

  • Page 25: Screen Descriptions

    Screen Descriptions This chapter presents detailed descriptions of the various screens that allow you to control the receiver and observe results. Table 3.1 summarizes the screen functions. Table 3.1. Screen Summary Screen Display Function Page Skysearch Information Orbit Information Navigation Information Tracking Information Mode Control Differential Information...

  • Page 26: Screen 0 - Skysearch Information

    When a signal proves to be a satellite signal, the receiver reports LK (locked on), and then reads the satellite's ephemeris and almanac files. Status generally changes to LK within 2 minutes of operation. ZY-12 GPS Receiver...
  • Page 27 Indicates the lock status of the P2 code channel. Like the C/A code channel, reports SN (Sniff), LZ (Z tracking, locked without crypto) or LY (P code). ZY-12 1Y07- Reports the type of receiver and the software version number. When calling 1DY4 a service representative with any problem, have this number at hand.

  • Page 28: Screen 1 - Orbit Information

    The satellite's angle above horizon, ranging from 0° to 90°. Geodetic azimuth of the satellite clockwise from 0° geodetic north in units of 10° (geodetic north according to WGS-84 coordinates). When it displays 12, read it as 120°. ZY-12 GPS Receiver...
  • Page 29 Table 3.3. Screen 1- Orbit Parameters (continued) Parameter Description Indicates the range accuracy of each satellite. When 0, the accuracy is high; when over 8, the accuracy is low. Displays the satellite's health (general condition) in hexadecimal. Shows how many minutes have passed since lock was lost on the satellite. For example, when ELV is 35 and AGE is 12, the satellite was at an elevation of 35°...

  • Page 30: Screen 2 - Navigation Information

    E for east and W for west. Altitude is the ellipsoidal height, in meters. COG (course over ground) is the heading in degrees. The default unit is in true degrees (Tr). Magnetic mode can be selected in Screen 6. ZY-12 GPS Receiver...
  • Page 31 Table 3.4. Screen 2 - Page 1 Parameters (continued) Parameter Description SOG (speed over ground) is the receiver's velocity. Can be displayed in miles per hour (labeled MPH), kilometers per hour (KM/H), or knots (KN). The units are set on Screen 6, function 8: Unit Selection option. FOM (figure of merit) indicates the accuracy of the stand-alone position based upon satellite range residuals and PDOP.
  • Page 32 (KM) or miles (MI). >>>>>+<<<<< A visual representation of the direction in which to proceed in order to get back on track to the next TO waypoint. This example indicates you take a heading more to the right. ZY-12 GPS Receiver...

  • Page 33: Screen 3 - Tracking Information

    Screen 3 - Tracking Information Screen 3 (Figure 3.5) displays the data recorded for each tracked satellite. Table 3.6 describes the screen parameters. Figure 3.5. Screen 3 - Tracking Information Table 3.6. Screen 3 Parameters Parameter Description . (dot) Indicates no data are recorded for that satellite. * (star) Indicates data are recorded for that satellite.

  • Page 34: Screen 4 - Mode Control

    • Datum Selection • Modem Setup • Subcommands • Mission duration parameter setting and Zeroize command. Access the applicable subscreen via Screen 4. Table 3.7 describes the Screen 4 parameters. Figure 3.6. Screen 4 - Mode Control ZY-12 GPS Receiver...
  • Page 35 Table 3.7. Screen 4 Parameters Parameter Description First line of display The entire first line of the display shows the coordinates of the antenna - latitude, longitude, and altitude per the WGS-84 ellipsoid. Press the numbered keys, typing zero where necessary. When a field is full, the cursor automatically jumps to the next one.

  • Page 36: Position Fix Parameters

    You can also enable the ionospheric model to be used for position computation, display computed position in Screen 2 using UTM coordinates, and use point positioning mode. Figure 3.7. Position Fix Parameters ZY-12 GPS Receiver...
  • Page 37 To set a parameter, push the [e] key and use the arrow keys to move to the desired parameter. Press the numbered keys, typing zero where necessary. When a field is full, the cursor automatically jumps to the next one. Press [e] to save the values and return to Screen 4.

  • Page 38: Differential Mode Selection

    (Figure 3.8). This screen also gives access to lower-level screens where you specify parameters such as RTCM format parameters. This is accessed by selecting DIFFERNTL on Screen 4 and pressing the [e] key. If you ZY-12 GPS Receiver...
  • Page 39 do not have the Differential (D) option installed, this subscreen is unavailable. Table 3.9 describes the screen parameters. Figure 3.8. Differential Mode Selection Subscreen Table 3.9. Differential Mode Parameters Parameter Description BASE Toggle field sets the receiver to BASE, REMOTE, or DISABLED mode. Use an arrow key to highlight the mode indicator and press the + or - key to toggle it.

  • Page 40: Session Program Parameters

    Remote Monitor program in your computer. With the Remote Monitor program and a modem, you can operate a receiver that has been left in a remote location, and download its data files from across the world if necessary. ZY-12 GPS Receiver...
  • Page 41 Initial settings can be made on the receiver and it can be left running. Access this screen (Figure 3.10) from SESSION on Screen 4. Figure 3.10. SESSION Subscreen The first column on the left contains the session identifier. Ten sessions, labeled A through J, are possible.
  • Page 42 101, the start time for session A is 02:06 and the end time is 03:06, or 4 minutes earlier than day 100, thus the receiver can observe the same part of the window every day. ZY-12 GPS Receiver...

  • Page 43: Receiver Control Subscreen

    Receiver Control Subscreen Use the RECEIVER CONTROL subscreen (Figure 3.11) to control the operating mode of the receiver and how data and positions are stored. Figure 3.11. Receiver Control Subscreen Z MODE allows you to control when Z tracking is implemented. Z tracking is a method of providing full-wavelength dual-band P-Code data when anti-spoofing (A/S) is present.

  • Page 44: Port A/Port B/Port C/Port D Parameter Selection

    REAL TIME Toggles the serial output of real-time or raw data messages. Highlight REAL TIME and press the [+] or [-] key to toggle it on. Press [1] to access the REAL TIME message subscreen. ZY-12 GPS Receiver...

  • Page 45: External Frequency Setup

    External Frequency Setup This option lets you input an external frequency to override the receiver’s internal oscillator. To configure an external frequency, go to Screen 4 and select EXT FREQ (Figure 3.13). Table 3.13 describes the screen parameters. Figure 3.13. External Frequency Setup Screen Table 3.13.
  • Page 46 Output time message once every second, synchronized with GPS B:N C:N D:N time (rising edge of pulse is also synchronized with GPS time) through serial port A, B, C, or D. Message format is: $PASHR,PPS,dddddd where dddddd is the time in seconds of the week ZY-12 GPS Receiver...

  • Page 47: Datum Select Subscreen

    After issuing the 990 command, the falling edge of the pulse is synchronized with GPS time. After issuing the 991 command, the rising edge is synchronized with GPS time. Datum Select Subscreen This option lets you specify the datum of the receiver calculated pseudo-range option, or input the parameters for a user-defined datum.
  • Page 48 Appendix A. USER lets you input your own datum parameters (Figure 3.18). Table 3.15 describes the screen parameters. Figure 3.18. User Datum Subscreen ZY-12 GPS Receiver...

  • Page 49: Modem Setup Subscreen

    Table 3.15. User Datum Parameters Parameter Description DELTA-A The difference in the length of the semi-major axis between the WGS-84 reference ellipsoid and the user-defined reference ellipsoid. DELTA-F The difference in flattening parameters (1/f × 10 ) between the WGS-84 reference ellipsoid and the user-defined ellipsoid. DELTA-X The difference in the X, Y, and Z translation parameters between DELTA-Y...
  • Page 50 #,*,&,+, etc. After you have entered the string, press the up button until you see CARRIAGE RTN. Enter CARRIAGE RTN, then press the up button again to display LINE FEED. Enter LINE FEED. Now press the [e] key to save the string. ZY-12 GPS Receiver...

  • Page 51: Subcommands Subscreen

    Subcommands Subscreen The SUBCMDS option lets you enter system-level commands; this can also be done through Screen 8. To enter a command, go to Screen 4 and select the SUBCMDS option (Figure 3.21). Figure 3.21. Subcommands Subscreen To enter a system-level command, press [e] for data-entry mode, then use the numbered keys to enter a 3-digit command.

  • Page 52: Sec. Module Subscreen

    For a detailed explanation of each of the commands, see Screen 8. SEC. Module Subscreen This subscreen (Figure 3.22) allows you to set the duration of the mission, in days, and also to run the “Zeroize” command. Figure 3.22. SEC. Module Subscreen ZY-12 GPS Receiver...

  • Page 53: Screen 5 - Differential Information/Residuals Error/Msk Status

    Screen 5 - Differential Information/Residu- als Error/MSK Status Three different displays are available in this screen: • Page 1 displays differential information • Page 2 displays range residuals and position error information • Page 3 displays MSK status. To toggle between the pages, press the up or down arrows.
  • Page 54 1 message until a new type 1 message is generated. The communication-quality factor, defined as: (number of good messages / total number of messages) x 100 OFFSET The number of bits from the beginning of the RTCM byte in case of bit slippage. ZY-12 GPS Receiver...

  • Page 55: Range Residuals

    Range Residuals Page 2 of Screen 5 (Figure 3.24) displays the range residuals and position errors determined during position computation. Table 3.19 describes the screen parameters. Figure 3.24. Screen 5, Page 2 Table 3.19. Range Residual Parameters Parameter Description PRN number of satellites being tracked. Range residual associated with each satellite.

  • Page 56: Msk Status Menu

    Figure 3.25. Screen5, Page 3 - MSK Status Table 3.20. MSK Transmission Parameters Parameter Description Freq Frequency of the MSK transmission in KHz. Speed Speed of the MSK transmission in bits per second. Signal-to-noise ratio Signal strength ZY-12 GPS Receiver...

  • Page 57: Screen 6 - Waypoint Control

    Screen 6 - Waypoint Control The Navigation Option allows you to define a navigation route and enter the latitude and longitude of each waypoint included in the route. Knowing the route information and the coordinates of each point, the receiver can compute the distance between the present position and the next destination point (DTD), the course to follow to reach the next destination point (CTD), the time required to reach this point (TTD) based on the present speed over ground, and the cross...
  • Page 58 XX is the next sequential number beginning from 01. Up to 99 positions (HERE_01 to HERE_99) can be logged this way. The logged position is momentarily displayed in Screen 6, in the first waypoint line, acknowledging it was ZY-12 GPS Receiver...
  • Page 59 stored. Next time Screen 6 is accessed, the first waypoint line shows the first waypoint of the route (Figure 3.28). Figure 3.28. Screen 6 - Waypoints 2: Set Display This function specifies whether the list of records displayed in Screen 6 is the list of waypoints that make the route, or a specific set of selected waypoints.
  • Page 60 5. Press [e] and the set of selected waypoints display in Screen 6. To return Screen 6 to the waypoints list, select AUTOMATIC. 3: Edit Waypoint This function lets you create, edit and/or clear a waypoint, and to copy the information of one waypoint to another. ZY-12 GPS Receiver...
  • Page 61 To access this function highlight EDIT WAYPOINT, and press [e] (Figure 3.31). Figure 3.31. Edit Waypoint To edit a waypoint proceed as follows: 1. With the waypoint number highlighted, cycle through the list of waypoints, using the up and down arrows, until the desired waypoint is displayed. Alternatively, using the numbered keys, enter the waypoint number.
  • Page 62 3. Press [e] and the FROM waypoint information is copied to the TO waypoint. Edit the copied information if necessary. 4. From the data field, press [e] to save the waypoint. If desired, you can now edit a new point. If not, press [e] to return to Screen 6. ZY-12 GPS Receiver...
  • Page 63 4: Edit Route This option allows you to create or modify a route. You can edit, add, or remove waypoints from the route, and also reverse the order of the waypoints in the route.To select this option, highlight EDIT ROUTE and press [e] (Figure 3.33). Figure 3.33.
  • Page 64 To select this function do the following: 1. Select RESTART ROUTE and press [0] (Figure 3.34). Figure 3.34. Restart Route 2. Using the + or - keys, toggle between "start at beginning" and "start at nearest". Select one. ZY-12 GPS Receiver...
  • Page 65 3. Press [e] and the receiver restarts the route. If "start at beginning" were selected, the receiver points TO the first waypoint and uses the current position at that time to navigate FROM. The first waypoint is highlighted. If "start at nearest"...
  • Page 66 (highlight WAYPT. SWITCH and press the [e] key), the receiver advances to the next leg of the route (Figure 3.36). Figure 3.36. Next Leg 7: Range Bearing This function calculates the range and bearing between any two consecutive waypoints in the route. ZY-12 GPS Receiver...
  • Page 67 To use this function, highlight RANGE/BEARING and press [e] (Figure 3.37). Figure 3.37. Route Display The display shows the route being followed. One of the legs is highlighted and the coordinates of the waypoints associated with this leg are being displayed in the next two lines.
  • Page 68 This function allows you to define the magnetic variation mode used when displaying the COG and CTD values in Screen 2 and VTG NMEA message, and the bearing value displayed in 7: RANGE/BEARING (Screen 6), and the APA and BWC NMEA messages. ZY-12 GPS Receiver...
  • Page 69 To select this function, highlight 9:MAGVAR MODE and press [e]. The magnetic variation mode screen (Figure 3.39) displays. Figure 3.39. Magvar Mode With the magnetic variation field highlighted, press + or - to toggle between the three modes available: TRUE, AUTOMATIC, or MANUAL. When the TRUE mode is selected, the COG, CTD, and bearing values are displayed using true degrees (°T).
  • Page 70 AUTO field is the value used when the AUTOMATIC mode is selected and is displayed just for reference. To save the selection, press the [e] key. To exit without saving, press the [c] key. ZY-12 GPS Receiver...

  • Page 71: Screen 7 - Satellite Selection Control

    Screen 7 - Satellite Selection Control Use Screen 7 (Figure 3.41) to specify whether to include or omit specific satellites for tracking. Y indicates that the associated satellite are used; N means that are not used. Figure 3.41. Screen 7 - Satellite Selection Control Also on this screen, you can put the receiver in AUTOMATIC selection or in MANUAL mode by entering either a Y or an N in the AUTO SELECTION field.

  • Page 72: Screen 8 - File Display And System Control

    Indicates the available memory in equivalent hours and percent. For AVAIL example, a ZY-12 receiver with the standard one megabyte of memory displays 19.5 EQHR when empty; this is equivalent to 19.5 hours of record capability at 20 seconds record interval for 5 satellites.
  • Page 73 Table 3.21. File Control Parameters (continued) Parameter Description PICS In photogrammetry applications, displays the count of camera signals recorded. Updated each time a picture is taken or event recorded. For more information refer to Application 3, Photogrammetry Option. Page Page of the screen where the files being displayed are stored. System-Level Commands Several system-level commands are available to the user.
  • Page 74 2. Press [e] to shift to date-entry mode. Highlight the site (file) you want to delete. 3. Use the number keys and enter [4][5][6]. Press [e] again and wait until the end of the current cycle for the file to be deleted and erased from the display. ZY-12 GPS Receiver...

  • Page 75: Screen 9 - Site And Session Control

    Screen 9 - Site and Session Control Use Screen 9 (Figure 3.43) to enter information about a specific site. Site information can be entered during data collection and does not affect or interrupt the collection process. Table 3.23 describes the screen parameters. Figure 3.43.
  • Page 76 When the values are acceptable, press [e] again to save them in memory. Pressing [c] cancels all entries. Pressing [e] or [c] after data entry returns the screen to display mode. ZY-12 GPS Receiver...

  • Page 77: Screen 10 - All-In-View Information

    Screen 10 - All-in-View Information Screen 10 (Figure 3.44) shows a polar plot of the currently available satellites and their orbital paths. The display is reliable once the receiver has a complete almanac and a valid position in Screen 2. From cleared internal memory, the receiver takes about 12 minutes after lock to acquire a full almanac and display correct information.
  • Page 78 This is reached by pressing the up or down arrow on the All-in-View screen. The track starts at the satellite's rising elevation and azimuth and ends at the satellite's current position. This display is updated every 10 minutes. Table 3.25 describes the screen parameters. Figure 3.45. Orbital Track ZY-12 GPS Receiver...
  • Page 79 Table 3.25. Orbital Track Parameters Parameter Description PRN: 12 LOCKED displays the current satellite number, as well as its current elevation (EL) and its azimuth (AZ). It reports status as LOCKED or AVAILABLE. (PRN 12 is an example.) When you press the up arrow, the receiver displays the orbital track of the next higher number available/locked satellite.

  • Page 80: Screen 11 - Visibility Information

    Table 3.26. Visibility Parameters Parameters Description HORIZONTAL LINES Satellite availability windows shown in ascending order with PRN 01 at the bottom and PRN 32 at the top. The start/end times are accurate to 10 minutes GMT:03:25:23 GMT time ZY-12 GPS Receiver...
  • Page 81 Table 3.26. Visibility Parameters (continued) Parameters Description PRN 11 In the upper right corner, contains the number of the PRN whose window is currently marked by the dotted reader-line. Pressing the up or down arrow raises or lowers the reader-line. VERTICAL LINES 2-hour time marks.

  • Page 82: Screen 12 - Bar Code Control

    If you try to enter more, the receiver rejects the last scan, displays an error message, and issues a long beep. Error messages are cleared when an entry is made within the 80-character limit. ZY-12 GPS Receiver...
  • Page 83 Each entry is displayed in reverse video. If you make an entry error, you can delete it by scanning the backspace (BKSP) bar code or pressing the down arrow. To clear an entire entry sequence, scan the CLEAR ALL bar code or press the [c] key.
  • Page 84 When using the epoch counter in kinematic surveying, first enter the site name and then the number of epochs to be counted down. When the name is acceptable, press [e] to save it in memory and return to display mode. ZY-12 GPS Receiver...

  • Page 85: Serial Port Output

    Real-time data, or raw data, can be output through any of the ZY-12’s four serial ports (A, B, C, D). It is typically sent to a computer or other data terminal equipment.

  • Page 86: Setup For Real-Time Data Output

    This procedure describes setup for Port A: 1. Connect a download cable between Port A on the receiver and a COM port on your computer. If COM1 is not available, use COM2. ZY-12 GPS Receiver...
  • Page 87 2. On Screen 4, Figure 4.1, press [e] to activate the data-entry mode. Use the arrow keys to highlight Port A. Figure 4.1. ZY-12 Screen 4 3. Press [e] to call the Port A Parameter Selection screen, Figure 4.2. Figure 4.2. Port A Parameter Selection...

  • Page 88: Contents Of Real-Time Messages

    7. Check the Baud Rate field. If the baud rate does not match the baud rate of the device to which the ZY-12 is connected, use the arrow keys to highlight the baud rate field and toggle [+] or [-] to chose the correct rate.
  • Page 89 The header field always contains "$PASHR". The message identifier field contains a three character string and is followed by a field containing the binary data string. The header, identifier, and data fields are comma delimited. Depending on the message selected, the checksum is contained in the last one or two bytes of the binary data string.
  • Page 90 (29) P code on L1 block (same format as C/A code data block) (29) P code on L2 block (same format as C/A code data block) unsigned character Checksum, a bytewise exclusive OR (XOR) total bytes ZY-12 GPS Receiver...
  • Page 91 For details on warning flag and good/bad flag, see MBN message structure in ASCII. The structure of the MBN message in ASCII format is shown below: $PASHR,MPC,d1,d2,d3,d4,d5,d6,d7,d8,d9,d10,d11,f12,f13,f14,f15, d16,d17,d18,d19,d20,d21,f22,f23,f24,f25,d26,d27,d28,d29,d30,d31, f32,f33,f34,f35,d36,hh Table 4.4. MBN Message Structure [ASCII format] Parameter Description Units Range Sequence tag.
  • Page 92 Range smoothing quality 0 - 200 Checksum Displayed in decimal. A bytwise exclusive OR (XOR) on all bytes from the sequence tag to the checksum (starts after MPC, and includes the last comma before the checksum). ZY-12 GPS Receiver...
  • Page 93 Table 4.5. Warning Flag Settings Description of parameter d Bits Index Combination of bit 1 and bit 2 same as 22 in good/bad flag same as 24 in good/bad flag same as 23 in good/bad flag carrier phase questionable code phase (range) questionable range not precise (code phase loop not settled) Z tracking mode...
  • Page 94 Receiver time with seconds of the week when code is 0 - 604800.00 received Station position: ECEF-X (meters) ±9999999.9 Station position: ECEF-Y (meters) ±9999999.9 Station position: ECEF-Z (meters) ±9999999.9 Latitude in degrees and decimal minutes (ddmm.mmmmmm) ±90 Positive north. ZY-12 GPS Receiver...
  • Page 95 Table 4.8. $PASHR,PBN Message Structure (ASCII) (continued) Parameter Description Range Longitude in degrees and decimal minutes ±180 (dddmm.mmmmmm) Positive east. Altitude (meters) ±99999.999 Velocity in ECEF-X (m/sec). ±999.99 Velocity in ECEF-Y (m/sec). ±999.99 Velocity in ECEF-Z (m/sec). ±999.99 Number of satellites used for position computation. 3 -12 Site name 4 character...
  • Page 96 The SALM message contains much of the same data available in the SNV message, but also includes an almanac week reference. Like SNAV, the SALM message is output in binary format only. One SALM message is output for each ZY-12 GPS Receiver...
  • Page 97 satellite for which the receiver has collected almanac data. Table 4.10 below outlines the contents of the SALM message. The structure of the SALM message is shown below: $PASHR,ALM,<Almanac Data + Checksum> Table 4.10. ALM Message Structure Type Size Contents short Satellite PRN -1 short...
  • Page 98 # of bytes Description data length unsigned short number of bytes in <packed data> part packed data unsigned char[] data length see below ChkSum unsigned short Accumulative unsigned short summation of the <packed data>, after <data length> before <ChkSum> ZY-12 GPS Receiver...
  • Page 99 <packed data> Parameter: Table 4.12. $PASHR,RPC Packed Parameter Descriptions Data Compressed Symbol Range Resolution Description Type # Bits double rcvtime 0 - 604800000 1 msec Receiver time in GPS milliseconds of week char[4] site ID Receiver’s four character’s site ID long PRN for the satellites which have data in this message.
  • Page 100 The EPB message contains actual broadcast ("raw") ephemeris data. See the ICD-GPS-200 for a definition of the parameters. Each subframe word is right- justified in a 32-bit long integer. The structure of the EPB message is shown below: $PASHR,EPB,d,<Ephemeris Data + Checksum> ZY-12 GPS Receiver...
  • Page 101 Table 4.14 outlines the response format. Table 4.14. $PASHR,EPB Response Format Type Size Contents PRN number struct long Subframe 1, word 1 long Subframe 1, word 2 long Subframe 1, word 3 long Subframe 1, word 4 long Subframe 1, word 5 long Subframe 1, word 6 long...
  • Page 102 Table 4.14. $PASHR,EPB Response Format (continued) Type Size Contents long Subframe 3, word 8 long Subframe 3, word 9 long Subframe 3, word 10 short Word checksum begin with header ‘P’. total = struct size ZY-12 GPS Receiver...

  • Page 103: Security Function Tests

    Security Function Tests Contact the security officer and give the number and serial number of the units ready for the security function tests. All the following tests are performed in a temperature chamber set at 55° C, but this is not a requirement. Many of the following tests can be performed and verified either by the receiver's front panel controls and display or by serially communicating with the receiver from a PC.
  • Page 104 GPS to UTC time in the $PASHR,STA response. [Note this may take from 10 to 20 minutes.] The satellite locked status can also be monitored by observing the ZY-12's screen 0. Where satellites are locked, the "STAT" row will show "LK". For PL1 and PL2, "LZ"...
  • Page 105 10. ENSURE RECEIVER ENTERS "Y-MODE" 1. The ZY-12 should stay locked to the satellites. Observe screen 0 for the status of the satellites locked. By computer, type "$PASHQ,STA" <Enter> 2. When the receiver has locked to satellites, check that the receiver has a key and has entered Y-mode by the following steps: •...
  • Page 106 "1" up to the satellite noted in Step 11.1. Leave that satellite set to "Y". Press <e>. Now go to screen 8. Press <e>. The 3- digit field at the bottom of the screen should be highlighted. Enter in "987" in that field and press <e>. ZY-12 GPS Receiver...
  • Page 107 "24" for L1 and L2 frequency. Note when 12 channels are locked, then there should be 24 indications of the "24" response. 4. To exit the Channel test, perform a "soft" reset of the ZY-12 with the following command: Type "$PASHS,INI,5,5,5,5,0,0" <ENTER>.
  • Page 108 If you do not observe the proper zeroize response, repeat the command to confirm that the security key was erased. If the security key cannot be confirmed as erased with the proper response, immediately notify the security officer and follow security procedures for an incomplete key erase. ZY-12 GPS Receiver...

  • Page 109: Key Loading Instructions

    Key Loading Instructions Receiver Firmware Upload 1. Be sure the receiver is loaded with the latest firmware “1Y07". Initial Self Test & Crypto Board Test 1. Plug in the power and antenna cables into the respective outlets on back of the receiver.
  • Page 110 If the key was loaded successfully, the load indicator light on the interface box will flash. 6. Turn the KYK-13 command knob to OFF. 7. If more keys need to be loaded, turn the selection knob to the desired buffer and start at Step 4. ZY-12 GPS Receiver...

  • Page 111: Datums

    Datums This appendix presents transformation parameters that are used by GPS receivers to convert pseudo-range positions, shown on Screen 2, from WGS-84 into the desired datum. The datums are from Deptartment of Defense document SS-M/V-500, Rev. P, 16 Oct. 1991. Receiver datum codes are selected from a subscreen of Screen 4 on the receiver DATUM SELECT option.
  • Page 112 European 1979 Austria, Int'l. -251 -0.14192702 -119 Finland, Netherlands, Norway, Spain, Sweden, Switzerland Gandajika Base Rep. of Maldives Int'l. -251 -0.14192702 -133 -321 Geodetic Datum New Zealand Int'l. -251 -0.14192702 1949 Hjorsey 1955 Iceland Int'l. -251 -0.14192702 ZY-12 GPS Receiver...
  • Page 113 Table A.1. Datum Translation Parameters (continued) Reciver Transformatio Parameter Differences Local Geodetic eference Datum Area Parameters System Ellipsoid a (m) f ×10 Codes X(M) Y(M) Z(M) IND-A Indian Thailand, Everest 860.655 0.28361368 Vietnam IND-M Indian Bangladesh, Everest 860.655 0.28361368 India, Nepal Ireland 1965 Ireland Modified Airy 796.811...
  • Page 114 0.28361368 -689 Malaysia, Sarawak, Sabah TOY-M Tokyo Japan, Korea, Bessel 1841 739.845 0.10037483 -128 Okinawa WGS 72 WGS 1972 WGS 72 -2.0 -0.3121057 -4.5 WGS 84 WGS 1984 WGS 84 Zanderij Surinam Int'l. -251 -0.14192702 -265 -358 ZY-12 GPS Receiver...
  • Page 115 ....77 INDEX barcoder (computer program) ........4 battery voltage .....61 bearing and range values ..........70, beep Symbols ........48 bit slippage ..........62 ........91 $PASHR,ALM ........94 $PASHR,EPB ........84 $PASHR,MPC ..........21 C/A code ........88 $PASHR,PBN ........3 cancel an entry ........92 $PASHR,RPC ......92 carrier phase differential ........89 $PASHR,SNV .........44...
  • Page 116 ..........71 polar plot .......65 ..........17 include or omit satellites ......16, ......29 installed options position computation ........14 internal RAM criteria ......30 ....41 ionospheric model position stored in memory ........48 .........29 issue of data post-processing ........5 power switch ..........48 ...........23 ZY-12...
  • Page 117 ......41, 42, pseudo-range screen 9, site and session control table summary ........41 select a datum ........48 quality factor ........41 selected datum ..........4 selecting .....16 Serial number of receiver ........23 range accuracy .....46 serial number of receiver ........25 range residual ........38 serial port cables ......48 range-rate correction...
  • Page 118 ........25, VDOP ........31 VDOP MASK ..........74 visibility ........4 voltage (input) ..........62 ..........38 .......22, 29, WGS-84 ..........66 ........44 Worldblazer ...........26, ..........22 Z mode ..........48 Z-count ZY-12...
  • Page 120 In Germany +49 81 6564 7930 • Fax +49 81 6564 7950 In Russia +7 095 956 5400 • Fax +7 095 956 5360 In the Netherlands +31 78 61 57 988 • Fax +31 78 61 52 027 Email surveysalesemea@thalesnavigation.com Web site www.thalesnavigation.com ©2004 Thales Navigation, Inc. All rights reserved.

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