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Sercel MRU User Manual

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MRU
User's Manual
Software version 2.0
Issue : January 2002
Documentation Part No. 0311355

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  • Page 1 MRU User's Manual Software version 2.0 Issue : January 2002 Documentation Part No. 0311355...
  • Page 2 SERCEL has been advised, or knew or should have known of the possibility of such damages.
  • Page 3 SERCEL MRU units. An MRU is a special transceiver performing the following functions : - When configured for use in a vehicle to be tracked the MRU provides a radio link that allows the vehicle to transmit its position and status to the base station and receive messages from it.
  • Page 4 Introduction The MRU is configured by simply connecting one of its serial port to a PC computer and running a configuration program. A typical application is one for SN388 seismic data acquisition system users, consisting of implementing an MRU network to track a seismic crew's...
  • Page 5 - A refresh rate (10, 30 or 60 seconds; the same rate for all vehicles). - Choosing a master MRU to be the sync master. This should be an MRU equipped with a high-accuracy master oscillator. The sticker on the rear panel of the MRU tells you whether it is a Master MRU (i.e.
  • Page 6 Labelled «MRU Software Setup» MRU-PC RS232C cable (part No. 1A17075074) • Content of the «MRU Software Setup» diskette (part No. 1A17075136) BASE.BAT Command file intended for « base » MRU (i.e. MRUs installed in central or monitoring station) BASE.12 Configuration file intended for base MRU not used as the sync master BASE_MST.12...
  • Page 7 Configuring an MRU network • Configuration procedure Now that your MRU is connected to a PC as indicated in the previous paragraph, do the following : - Insert the diskette into drive A - Select the A drive - Type in one of the following commands depending on whether the attached MRU is intended to be used at the central or monitoring station («...
  • Page 8 Configuring an MRU network • Examples A: \ >base 4900 camp Configures the MRU as the unit to be used at the monitoring station and operating on freq. Channel # 4900 A: \ >base 4900 lab master Configures the MRU as the unit to be used at the central station and operating on freq.
  • Page 9 PC screen. You can disconnect the MRU and then repeat the configuration step with another MRU that you first connect to the PC. Repeat this operation until the whole network of MRUs is configured. 2-3 CONFIGURING MRU...
  • Page 10 The syntax is the same as with a PC. See par. 2-2 above for a description of the procedure and parameters. Examples : mru -b 4900 camp mru -b 4900 Lab master mru -m 4900 10 10 0311355 Issue : January 2002...

  • Page 11: Installation

    Installation INSTALLATION 3-1 MRU • Mounting dimensions Two mounting bars and four shock absorbers are provided so that you can install the MRU in a vehicle. EMERGENCY Hole dia. 6 mm Receive Transmit MADE IN FRANCE Shock absorber 160 mm...

  • Page 12: Base Station

    - equipped with a high-accuracy master oscillator (this is signalled by the mention "Master MRU" on the sticker on the rear panel), - and configured as sync master (see par. 2-2 to configure an MRU as Sync Master). IMPORTANT : If two base stations are implemented (a Central Station and a Monitoring station), only one should be configured as Sync Master.
  • Page 13 Workstation's display unit SPARC STATION 5 Serial B Serial A (9600 Bd) (4800 Bd) To Printer or Workstation serial B port Printer MRU-Workstation cable (part No.1A17075075) See Appendix 2 (9600 Bd) MADE IN FRANCE Master MRU keyboard mouse mouse pad SN388...
  • Page 14 Printer Port A (4800 Bd) Port B To printer or workstation port B MRU-Workstation cable (part No.1A17075075) See Appendix 2 (9600 Bd) MADE IN FRANCE Master MRU Note for SN388 users: See Appendix 4 0311355 Issue : January 2002...

  • Page 15: Mobile Unit

    This port can be connected to a printer or to the Serial B port of the workstation. The pin assignment of the connector on the rear panel of the MRU is shown in Appendix 2. If you choose to connect the MRU's B-port to the workstation (Serial B), then service messages will be displayed in the lower pane of the Message Setup dialog box (see par.
  • Page 16 Installation 0311355 Issue : January 2002...
  • Page 17 4-1 Prerequisites Prior to configuring your workstation for the vehicle tracking function, make sure SOLARIS and SERCEL MRU software has been installed and the startup configuration has been set. (The startup configuration has to be set the first time you start your workstation or after installing a new software release).
  • Page 18 Configuring a base station Clicking APPLY saves the selected parameters and Datum type to the data base. You select the Datum type to be used through the Projection Type Setup dialog box (from the menu bar, select Setup > Geodetic > Projection). 4-3 The Projection type setup Your DGPS receivers normally output GPGGA-type messages (Latitude, Longitude, Altitude above the ellipsoid).
  • Page 19 Configuring a base station The format of angular parameters (Central Meridian, Latitude origin, Reference Latitude, North Latitude, South Latitude, Skew Angle) is : dddmmss.ss (Degrees, Minutes, Seconds with two decimal places). → Examples : Latitude North 16° 4' 56.24" 160456.24 →...

  • Page 20: The Map Setup

    Configuring a base station 4-5 The Map setup Selecting Image from the Setup menu opens a dialog box allowing you to load a graphic file (containing a scanned map or a satellite photo map) from the database to the Positioning main window. The IMPORT button in the lower pane allows you to load a graphic file from the /tmp UNIX directory to the database.
  • Page 21 Configuring a base station The scale does not need to be set if the necessary data are provided along with the graphic file (e.g. satellite photo map file). If the graphic file originates from a scanner, then you need to enter the coordinates of two marks chosen on the scanned map.
  • Page 22 Configuring a base station (5) In the SCALE IMAGE dialog box - Enter the Easting and Northing of the second mark into the respective text boxes in the "Second Point coordinates" pane. - click SELECT (in the "Second Point coordinates" pane). - Click APPLY.

  • Page 23: Marker Setup

    Configuring a base station 4-6 MARKER SETUP Selecting Marker from the Setup menu opens a dialog box allowing you to load a .DXF file (containing a graticule to be superimposed on a map) from the database to the Positioning main window. The IMPORT button in the lower pane allows you to load a graticule file from the /tmp UNIX directory to the database.
  • Page 24 Configuring a base station 0311355 Issue : January 2002...

  • Page 25: Operating Instructions

    5-1 At the base station 5-1-1 PREREQUISITES Each vehicle to be tracked should be equipped with an MRU unit so that it can send its position (computed by a radiopositioning receiver) and status to the base station (central station and/or monitoring station), and receive waypoints and/or messages from the base station.
  • Page 26 Operating instructions • How to use the Zoom function With the mouse pointer resting anywhere in either pane, press the left button of the mouse. The mouse pointer should change to a left-pointing hand. Drag the mouse pointer slowly toward the lower-right corner. This causes an elastic frame to show up that enlarges until you stop dragging the mouse pointer.
  • Page 27 Operating Instructions Drag the mouse pointer (without releasing the button) to the other end. As a result the corresponding distance (D) is displayed above the upper pane. To cancel the zoom view appearing when you release the button, press the mouse right button. •...
  • Page 28 Operating instructions 5-1-3 HOW TO LOAD A GRAPHIC FILE TO THE HARD DISK To load a file from a floppy disk to the /tmp directory: Insert the floppy disk into the drive. Open the “File Manager” window (with the mouse center button). Open the /tmp directory (double-click the respective icons).
  • Page 29 Operating Instructions 5-1-4 THE MAIN WINDOW Each tracked vehicle has an identification number that appears as a green circled number in the POSITIONING window's graphic pane. Every ten seconds the vehicle reports its latest position (no more than 2 seconds old) and status to the base station, which updates the position of the vehicle shown in the POSITIONING main window.
  • Page 30 5-1-5 ALERT SCHEME • Alarm Actuating the EMERGENCY button on a mobile MRU generates an alarm status. As a result the identification number of the corresponding vehicle turns red at the base station when the next position message is received, and a beep sounds until you reset the alarm.
  • Page 31 Operating Instructions If you wish to reset the alarm on a specific vehicle, select “To Specified No.” from the BROADCAST option button and type the vehicle number in the associated text box. Click APPLY. This resets all alarms or the specified alarm, depending on the option you selected, WHETHER OR NOT the message text box contains a message to be transmitted.
  • Page 32 Release the button and key. As a result: - On the vehicle: a waypoint is input to the vehicle's radiopositioning receiver (via the MRU) and printed out. The coordinates of the waypoint are those of the point where you dropped the vehicle number on the map.
  • Page 33 Operating Instructions 5-1-8 SENDING A MESSAGE TO A VEHICLE See The Message setup window. 0311355 Issue : January 2002...
  • Page 34 Operating instructions 5-2 The Vehicle Log setup window The position of each tracked vehicle is logged into a daily file (unless you disabled this function when you installed the system with the INSTALL utility), with the julian day number as file identification. Selecting VEHICLE then LOG from the SETUP menu opens a dialog box that lets you select a daily log file and a vehicle and plot its trackline on the map in the graphic pane.
  • Page 35 Operating Instructions The option button above the list boxes allows you to have the trackline daily log files prompted in two different ways : - With the list of vehicles to the left, you select (by clicking) a vehicle, then the list of available daily files appears to the right.
  • Page 36 Operating instructions • Floppy Disk This option allows you to select recorded positions from a floppy disk. The Copy to Internal Disk button is used to copy the file currently selected from the floppy disk to the hard disk. The Delete button deletes the currently selected file from the floppy disk.
  • Page 37 Operating Instructions 5-3 The Base setup window Selecting BASE from the SETUP menu opens the Base setup dialog box with two buttons used to enable/disable the display of a base station icon on any map in the graphic pane. 5-3-1 To place a base station icon into your survey map view Activate the desired base station button (“Lab”...
  • Page 38 Operating instructions 5-3-3 To delete the base station icon Click (de-activate) the appropriate button in the Base setup dialog box. Click APPLY. 5-4 The Watchdog setup window Selecting “Watchdog” from the SETUP menu opens the Watchdog setup dialog box that allows you to specify alert conditions for the tracked service vehicles (not for tracked vibrators).
  • Page 39 Operating Instructions • No reply Watchdog: This watchdog alerts you if the position of a vehicle fails to be refreshed within the time (seconds) you specify in the “Watchdog” field, for instance if no position message is received from the vehicle. Entering 0 disables this watchdog.
  • Page 40 5-5 The Message setup window Selecting MESSAGE from the SETUP menu opens a dialog box that allows you to send messages to any service vehicle equipped with an MRU unit. To send a message, do the following : - Type the message text in the Message setup dialog box.
  • Page 41 NOTES 1 - The lower pane in the Message Setup dialog box is used to view service messages if the B-port of the MRU is connected to the workstation (Serial B port) instead of a printer. 2- To drag and drop, do the following : .
  • Page 42 Identity number of a vehicle, defined when you configure the MRU for the vehicle. (See chapter 2). LABEL Label you wish to assign to the vehicle identified in the Id text box.
  • Page 43 Operating Instructions any waypoint yet and those which have a waypoint counter at 100. • How to generate a Vehicle Identity Setup The list box to the left of the ADD button shows the list of existing vehicle labels. To define a new label, enter the desired Id Number and Label into the appropriate text boxes, select the desired option, then click ADD.
  • Page 44 5-7-2 MRU BOX After you power on the MRU, the « Receive » indicator light remains ON for a few seconds, until the MRU gets synchronized. Then the « Transmit » indicator light should briefly light up every 10 seconds, indicating that the MRU is transmitting properly.

  • Page 45: Theory Of Operation

    Appendix 1 1 : TDG BOARD PPENDIX THEORY OF OPERATION A1.1 - INTRODUCTION The TDGx is a fully configurable, multi-purpose data communications board intended for use in applications where a number of devices have to communicate with each other from distant places. The TDGx board interfaces with the user equipment by way of one or two RS232C ports used both as control inputs (to configure the board) and as inputs/outputs in the data transmission process.
  • Page 46 Appendix 1 However the data transmission scheme departs from a conventional RS232 line in three ways : • A UHF link (operating on frequency Channel x) is placed «in series» with the RS232 line. This radio link offers ranges from 10 to 50 km, depending on the propagation conditions.
  • Page 47 Appendix 1 A1.2 - TDG BLOCK DIAGRAM The TDGx board falls into two main sections (see also the block diagram below) : • A UHF transceiver section. • A data processing section mainly composed of : - 2 serial ports (A and B) of the RS232C type - 2 FIFO buffers implemented at the input and output of the serial ports.
  • Page 48 Appendix 1 A1.3 - THEORY OF OPERATION A1.3 -1 THE FUNDAMENTAL PARAMETERS TheTDGx is based on the principle of Time Division Multiple Access (TDMA). With this technique, the design engineer has to allocate a particular time (time channel) to each of the radio links he/she wants to implement. Each allocation is exclusive, which means that there can only be one transmitting unit in a given time channel.
  • Page 49 Appendix 1 • The rank in the subframe Defined as the number of the format (in the subframe) containing the slot used to transmit radiolocating data. All these parameters make up the time scale of any equipment using a TDGx board to perform data transmission (see diagram below). 1 format 0 1 2 0 1 2...
  • Page 50 Appendix 1 A1.3 - 2 TRANSMISSION SPECIFICATIONS Channel bandwidth : 12.5 kHz Two frequency sub-bands : 408 to 440 MHz and 430 to 470 MHz, de- pending on the country (450 to 470 MHz for the USA). Frequency/Channel allocation table : see A1.4 Slot duration : 20 ms Format length : 2 to 60 slots, programmable Usable slots (outside sync slot) : all slots except slot 00 used for calibration...
  • Page 51 Appendix 1 A1.3 - 3 SYNCHRONIZING A NETWORK OF TDG BOARDS Introduction The synchronization step is a prior requirement to allowing any radio link to take place. In this step all the time scales of the considered TDGx boards are made synchronous with that of a TDGx board taken as the reference and called the sync master.
  • Page 52 Appendix 1 Synchronization procedure The process of synchronizing a TDGx board onto the sync master TDGx board is achieved through the following steps : - The non-synchronized TDGx board is switched to reception mode every other slot, in search of the preamble character present in every message received.
  • Page 53 Appendix 1 - After receiving three consecutive sync messages, the TDGx board can de- termine the format parameter from the time interval between any two consecutive sync messages and the frame count (also provided in the sync message). - At this stage, the TDGx board has acquired all the parameters needed to synchronize its frame onto that of the sync master.
  • Page 54 (1, 2, or 3 bytes) Format appended or not (1) As per NMEA standard or Sercel standard. Interpreted and re-arranged by TDGx (2) Not interpreted by the TDGx, hence « transparent » transmission mode. 0311355 Issue : May 1998...
  • Page 55 Appendix 1 A1.3 - 6 BOARD CONFIGURING TOOLS A library of commands applicable locally to either of the RS232C ports of the TDGx board allows the sytem engineer to design a «configuration» for the board. At the user (or installer) level, the board configuration step just consists of running a program file (some additional parameters may have to be specified in the command line) containing a list of commands which the board then executes for self-configuration purposes.
  • Page 56 Appendix 1 For an informative purpose, a brief description of the commands used to implement these functions is listed hereafter. CONF_A Reads/changes configuration of port A CONF_B Reads/changes configuration of port B Reads/changes frequency channels used in reception and transmission CF_EMA Reads/Changes slots defined as transmit slots allotted to port A...
  • Page 57 Appendix 1 A1.4 - CHANNEL/FREQUENCY TABLE 0 : 400000.0 kHz 67 : 400837.5 kHz 134 : 401675.0 kHz 201 : 402512.5 kHz 268 : 403350.0 kHz 335 : 404187.5 kHz 1 : 400012.5 kHz 68 : 400850.0 kHz 135 : 401687.5 kHz 202 : 402525.0 kHz 269 : 403362.5 kHz 336 : 404200.0 kHz...
  • Page 58 Appendix 1 402 : 405025.0 kHz 475 : 405937.5 kHz 548 : 406850.0 kHz 621 : 407762.5 kHz 694 : 408675.0 kHz 767 : 409587.5 kHz 403 : 405037.5 kHz 476 : 405950.0 kHz 549 : 406862.5 kHz 622 : 407775.0 kHz 695 : 408687.5 kHz 768 : 409600.0 kHz 404 : 405050.0 kHz...
  • Page 59 Appendix 1 840 : 410500.0 kHz 913 : 411412.5 kHz 986 : 412325.0 kHz 1059 : 413237.5 kHz 1132 : 414150.0 kHz 1205 : 415062.5 kHz 841 : 410512.5 kHz 914 : 411425.0 kHz 987 : 412337.5 kHz 1060 : 413250.0 kHz 1133 : 414162.5 kHz 1206 : 415075.0 kHz 842 : 410525.0 kHz...
  • Page 60 Appendix 1 1278 : 415975.0 kHz 1351 : 416887.5 kHz 1424 : 417800.0 kHz 1497 : 418712.5 kHz 1570 : 419625.0 kHz 1643 : 420537.5 kHz 1279 : 415987.5 kHz 1352 : 416900.0 kHz 1425 : 417812.5 kHz 1498 : 418725.0 kHz 1571 : 419637.5 kHz 1644 : 420550.0 kHz 1280 : 416000.0 kHz...
  • Page 61 Appendix 1 1716 : 421450.0 kHz 1789 : 422362.5 kHz 1862 : 423275.0 kHz 1935 : 424187.5 kHz 2008 : 425100.0 kHz 2081 : 426012.5 kHz 1717 : 421462.5 kHz 1790 : 422375.0 kHz 1863 : 423287.5 kHz 1936 : 424200.0 kHz 2009 : 425112.5 kHz 2082 : 426025.0 kHz 1718 : 421475.0 kHz...
  • Page 62 Appendix 1 2154 : 426925.0 kHz 2227 : 427837.5 kHz 2300 : 428750.0 kHz 2373 : 429662.5 kHz 2446 : 430575.0 kHz 2519 : 431487.5 kHz 2155 : 426937.5 kHz 2228 : 427850.0 kHz 2301 : 428762.5 kHz 2374 : 429675.0 kHz 2447 : 430587.5 kHz 2520 : 431500.0 kHz 2156 : 426950.0 kHz...
  • Page 63 Appendix 1 2592 : 432400.0 kHz 2665 : 433312.5 kHz 2738 : 434225.0 kHz 2811 : 435137.5 kHz 2884 : 436050.0 kHz 2957 : 436962.5 kHz 2593 : 432412.5 kHz 2666 : 433325.0 kHz 2739 : 434237.5 kHz 2812 : 435150.0 kHz 2885 : 436062.5 kHz 2958 : 436975.0 kHz 2594 : 432425.0 kHz...
  • Page 64 Appendix 1 3030 : 437875.0 kHz 3103 : 438787.5 kHz 3176 : 439700.0 kHz 3249 : 440612.5 kHz 3322 : 441525.0 kHz 3395 : 442437.5 kHz 3031 : 437887.5 kHz 3104 : 438800.0 kHz 3177 : 439712.5 kHz 3250 : 440625.0 kHz 3323 : 441537.5 kHz 3396 : 442450.0 kHz 3032 : 437900.0 kHz...
  • Page 65 Appendix 1 3468 : 443350.0 kHz 3541 : 444262.5 kHz 3614 : 445175.0 kHz 3687 : 446087.5 kHz 3760 : 447000.0 kHz 3833 : 447912.5 kHz 3469 : 443362.5 kHz 3542 : 444275.0 kHz 3615 : 445187.5 kHz 3688 : 446100.0 kHz 3761 : 447012.5 kHz 3834 : 447925.0 kHz 3470 : 443375.0 kHz...
  • Page 66 Appendix 1 3906 : 448825.0 kHz 3979 : 449737.5 kHz 4052 : 450650.0 kHz 4125 : 451562.5 kHz 4198 : 452475.0 kHz 4271 : 453387.5 kHz 3907 : 448837.5 kHz 3980 : 449750.0 kHz 4053 : 450662.5 kHz 4126 : 451575.0 kHz 4199 : 452487.5 kHz 4272 : 453400.0 kHz 3908 : 448850.0 kHz...
  • Page 67 Appendix 1 4344 : 454300.0 kHz 4417 : 455212.5 kHz 4490 : 456125.0 kHz 4563 : 457037.5 kHz 4636 : 457950.0 kHz 4709 : 458862.5 kHz 4345 : 454312.5 kHz 4418 : 455225.0 kHz 4491 : 456137.5 kHz 4564 : 457050.0 kHz 4637 : 457962.5 kHz 4710 : 458875.0 kHz 4346 : 454325.0 kHz...
  • Page 68 Appendix 1 4782 : 459775.0 kHz 4855 : 460687.5 kHz 4928 : 461600.0 kHz 5001 : 462512.5 kHz 5074 : 463425.0 kHz 5147 : 464337.5 kHz 4783 : 459787.5 kHz 4856 : 460700.0 kHz 4929 : 461612.5 kHz 5002 : 462525.0 kHz 5075 : 463437.5 kHz 5148 : 464350.0 kHz 4784 : 459800.0 kHz...
  • Page 69 Appendix 1 5220 : 465250.0 kHz 5284 : 466050.0 kHz 5348 : 466850.0 kHz 5412 : 467650.0 kHz 5476 : 468450.0 kHz 5540 : 469250.0 kHz 5221 : 465262.5 kHz 5285 : 466062.5 kHz 5349 : 466862.5 kHz 5413 : 467662.5 kHz 5477 : 468462.5 kHz 5541 : 469262.5 kHz 5222 : 465275.0 kHz...
  • Page 70 Appendix 1 0311355 Issue : May 1998 A1-26...

  • Page 71: Cable Pinouts

    Appendix 2 2 : C PPENDIX ABLE INOUTS MRU-PC RS232C line Connector 9-C SubD Male Female Port A Connector Plug Plug (Compulsory) Red (Power supply) + 12 V White Transmit A Receive Yellow Receive A Transmit Red (not connected) DTR (Data Terminal Ready)
  • Page 72 Ground Ground B To printer (9600 Bd) or to Transmit B workstation B-port Receive B Black (power supply) Cable part No. 1A17075075 MRU-GPS receiver RS232C line 9-C SubD Male Connector Plug Red (Power supply) + 12 V White Transmit A...
  • Page 73 Appendix 3 3 : D PPENDIX ATA COMMUNICATIONS SCHEME ... MRU, mobile # n ... MRU, mobile # 2 ... MRU, mobile # Port A Port B S05, S06 S05, S06 S08, S09 S08, S09 Position Waypoint, Waypoint, (NMEA Message...
  • Page 74 Appendix 3 0311355 Issue : January 1997 A3-2...
  • Page 75 The following directory : /users/sn388/sn388Hci/binsh Contains the following files : BASE.SUN : Command file intended for « base » MRU (i.e. MRU installed in the recording cab or at the base camp). BASE.12 : Configuration file intended for base MRU not used as the sync master.
  • Page 76 - Type stopAppli (press RETURN) - Type in one of the following commands depending on whether the at- tached MRU is intended to be used at the base camp or in the recording cab (“base “ MRU), or in a mobile ("mobile" MRU).
  • Page 77 HCI screen. You can disconnect the MRU and then repeat the configuration step with another MRU that you first connect to the HCI. Repeat this operation until the whole MRU network is configured. - Type runAppli (press RETURN)
  • Page 78 Use an MRU-Workstation cable (part No. 1A17075075). See Appen- dix 2. The MRU unit should be connected to the A port on your HCI work- station. If a DPG is used then the A port is not available. In that case, a second workstation is required, installed as X-Terminal emulation.

  • Page 79: Software Installation

    5 : SOFTWARE INSTALLATION PPENDIX A5-1 PREREQUISITES The MRU Vehicle Tracking software is designed to run on a workstation under the UNIX operating system. The workstation should be equipped with SOLARIS 5.7 or higher and MOTIF, with a multiwindowing system such as OPENWIN and with the VOLUME Manager.
  • Page 80 . Press <RETURN> to install MRU software to the default directory prompted, assuming you have created this directory (/opt/mru), . or specify the path to the directory you have created for the MRU software (e. g. /opt/softMru). - After MRU software installation is complete, type : <RETURN>...
  • Page 81 <RETURN> mru -i NOTE : If you did not choose the default path ( /opt/mru ) when you installed the MRU application, type the path you chose instead of /opt/mru , in the cd command. This opens the dialog box shown below, used to :...
  • Page 82 <RETURN> /opt/mru/sn388Hci/binsh If you did not choose the default path (/opt/mru) when you installed the MRU application, type the path you chose instead of /opt/mru. You will not have to type the above command if you enter the path into the PATH variable.
  • Page 83 6 : COORDINATES PPENDIX TRANSFORMATION UTILITY The coordinates transformation utility used in the MRU software applica- tion can be started individually so that you can convert coordinates from WGS84 to your favourite geodetic system or the other way round. To start the coord transformation utility, open a Shell window, select the MRU application's directory and type the following command : <RETURN>...
  • Page 84 Appendix 6 0311355 Issue : January 1997 A6-2...
  • Page 85 MRU Specifications APPENDIX 7 : MRU SPECIFICATIONS PHYSICAL Size : Height : 80 mm Depth : 295 mm Width : 155 mm Weight : 1.5 kg ENVIRONMENTAL Storage temperature : - 40°C to +70°C Operating temperature : Master : 0°C to +40°C Slave : 0°C to 45°C...
  • Page 86 Electrical No master oscillator. Special features The Slave MRU is allowed to switch to the transmitting mode on condition that : it receives the signal from the Master MRU for locking the TDG12 board's oscillator and synchronizing the transmission so that the slave MRU transmits during the desired time slot.

  • Page 87: Reference Information

    Appendix 8 8 : REFERENCE INFORMATION PPENDIX A8.1 MRU BLOCK DIAGRAM Power supply serial port A serial port B ONLY ON MRPW MASTER BOARD 10 MHz MASTER MRU + 5 V V. Batt + 12 V to UHF Power - 12 V...
  • Page 88 Appendix 8 A8.3 UHF OUTPUT AMPLIFIER CIRCUITRY BLOCK DIAGRAM +8VE OL.UHF Duplexer UHF output 3-pole filter 2-pole filter 3-pole filter Modulated Tx/Rx S21M 21.250 MHz IF signal IC31 IC13 G = 18 dB MHW707-2 Power amplifier G = 38 dB 0311355 Issue : May 1998 A8-2...
  • Page 89 Appendix 8 A8.4 MODULATION MODE Theory of operation Those frequency modulation techniques in which the phase variation is continuous on bit transitions are of special interest as they significantly increase the spectral efficiency. The special case where the modulation factor is 0.5 in those continuous- phase modulation techniques is known as MSK.
  • Page 90 Appendix 8 a band 1.5 times the bit frequency, that is 7.5 kHz. In comparison, with a QPSK modulation 99% of energy would lie in a 40-kHz band. With a filtered variant of the MSK modulation (GMSK, SMSK, etc.) the energy band is still narrower.
  • Page 91 Appendix 8 DATA bits Modulated 21.25 MHz signal (Frequency vs. data bits) 0311355 Issue : May 1998 A8-5...
  • Page 92 Appendix 8 Data transmit format (general case) Data zone Encryptable zone Content depends on input protocol used 8 × 8 bits 8 bits 16 bits 8 bits Auxiliary User Data Data Postamble Preamble checksum (11 bits) Encryption code parity Depends on input protocol used 0311355 Issue : May 1998 A8-6...
  • Page 93 Appendix 8 For Sync Master configuration, the high- accuracy oscillator should be installed MRPW Master board 0311355 Issue : May 1998 A8-7...
  • Page 94 Appendix 8 For Mobile configuration, S14should be shorted with solder (and S15 should be open) For Sync Master configuration, S15 should be shorted with solder (and S14 should be open) TDG12 board 0311355 Issue : May 1998 A8-8...
  • Page 95 Appendix 8 TDG12 board 0311355 Issue : May 1998 A8-9...
  • Page 96 Appendix 8 0311355 Issue : May 1998 A8-10...
  • Page 97 WGS84 latitude/longitude to a latitude /longitude on whatever Datum you are surveying on. This is done by on-line Datum transformation routines in SERCEL software. This is why you are required to select the appropriate Datum (in the Projection Type Setup dialog box).
  • Page 98 Glossary of basic geodesy terms 0311355 Issue : September 1996...

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