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Hemisphere GPS Crescent V100 User Manual

Crescent v100 series
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Crescent V 100 Series
User Guide
Part No. 875-0174-000 Rev. A1

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Summary of Contents for Hemisphere GPS Crescent V100

  • Page 1 Crescent V 100 Series User Guide Part No. 875-0174-000 Rev. A1...
  • Page 2 Hemisphere GPS Inc. Trademarks Hemisphere GPS and the Hemisphere GPS logo, Satloc and the Satloc logo, Mapstar, Air Star Outback Guidance and eDrive are trademarks of Hemisphere GPS. Other trademarks are the properties of their respective owners.
  • Page 4 Hemisphere GPS, of any defective Products or components thereof. The end user shall notify Hemisphere GPS or a Hemisphere GPS approved service center immediately of any claimed defect. Repairs shall be made through a Hemisphere GPS approved service center only.
  • Page 5 IMITATION OF IABILITY THE EXTENT OF HEMISPHERE GPS' LIABILITY FOR DAMAGES OF ANY NATURE TO THE END PURCHASER OR ANY OTHER PERSON OR ENTITY WHETHER IN CONTRACT OR TORT AND WHETHER TO PERSONS OR PROPERTY SHALL IN NO CASE EXCEED, IN THE AGGREGATE, THE COST OF CORRECTING THE DEFECT IN THE PRODUCT OR, AT HEMISPHERE GPS' OPTION, THE COST OF REPLACING THE DEFECTIVE ITEM.

  • Page 6: Table Of Contents

    Fixed-Base Mounting 9 Pole and Rail Mount 16 Powering the Crescent V100 ....28 Power Considerations 28 Connecting to a Power Source 28 Electrical Isolation 29 Connecting the Crescent V100 to External Devices .
  • Page 7 GPS Overview ....... 44 GPS Operation 44 Differential Operation 45 Understanding the Crescent V100 ....48 Moving Base Station RTK 48 Supplemental Sensors 49...

  • Page 8: Overview

    GPS heading is not available due to signal blockage. Note: The Crescent V100 model is identical to the V110 with the exception that it does not contain a DGPS beacon module. If you...
  • Page 9 The GPS antennas inside the Crescent V100 are separated by 0.5 meters (0.55 yards) between antenna phase centers, resulting in a ° 0.30 RMS heading performance. The Crescent V100 provides heading and positioning updates of up to 20 Hz and delivers positioning accuracy of 60 centimeters (23.62 inches) 95% of the...

  • Page 10: 1: Installation

    1: I NSTALLATION Mounting Locations Mounting Options Powering the Crescent V100 Connecting the Crescent V100 to External Devices...

  • Page 11: Mounting Location

    • It is important to locate any transmitting antennas away from the Crescent V100 by at least a few feet. This will ensure that tracking performance is not compromised, giving you the best performance possible. •...

  • Page 12: Beacon Reception

    By monitoring the SNR, you can determine the optimum location with respect to beacon reception. The SNR is available in the $CRMSS NMEA message described in Hemisphere GPS’ GPS Technical Reference manual.

  • Page 13: Crescent V100 Environmental Considerations

    ° while the For example, if a gyrocompass heading provides 183.2 Crescent V100 provides a heading of 184.0, a bias of -0.8 (the bias is added) should be programmed into the Crescent V100 to calibrate its heading. The Crescent V100 could be physically...

  • Page 14: Crescent V100 Alignment

    Crescent V100 to correct the heading. A feature is present in the Crescent V100 to change the sign of the roll/pitch measurement to be positive or negative, depending on the required conversion for positive/negative roll, if needed.
  • Page 15 Crescent V100 alignment within the Crescent V100 software configuration. Alternatively, you may wish to physically adjust the heading of the Crescent V100 so that it renders the correct heading measurement, however, adding a software offset is an easier process.

  • Page 16: Mounting Options

    Pole-and-rail mounting Fixed-Base Mounting The fixed base supplied with the Crescent V100 is intended to allow you to mount the system to a flat surface. This surface may be something that you fabricate for the sake of the installation, or may be something that already exists on your vessel or an off-the-shelf item, such as a radar mounting plate.
  • Page 17 The base has four tunnels that allow you to bring the power/data cable out from within the mount in order to route it along the surface of the plate beneath the Crescent V100 system. Alternatively, you may wish to route the power/data cable through the mounting surface rather than bringing it out through one of the tunnels.
  • Page 18 Before mounting the antenna on the fixed base: • Decide if you need the roll measurement. If you do, the Crescent V100 will need to be installed perpendicular to the vessel axis. If you do not require roll, install the Crescent V100 parallel with the vessel’s axis...
  • Page 19 1: Installation Routing the cable To install the Crescent V100 using the fixed base: Insert either end of the power/data cable through the center of the fixed base. (See Figure 1-6 and Figure 1-7 on page 12 and page 13.)
  • Page 20 Crescent V100 Series User Guide Figure 1-7. Running cable through fixed base Align the connector keyway of the cable to the key of the connector mounted on the Crescent V100 enclosure. (See Figure 1-8.) Insert the cable mount connector into the bulkhead connector, aligning the locking ring at the same time.
  • Page 21 Crescent V100 Once you have secured the connector, slide the fixed base up to the bottom of the Crescent V100 enclosure. There are two alignment keys on top of the base that just fit into two holes of the Crescent V100 enclosure.
  • Page 22 Crescent V100 Series User Guide Figure 1-10 and Figure 1-11 show the location of the screw holes. Figure 1-10. Fastening the fixed base to the Crescent V100 Figure 1-11. Fastening the fixed base to the Crescent V100...

  • Page 23: Pole And Rail Mount

    The pole mount incorporates a 1-14-UNS thread. To aid in the installation of the Crescent V100, we have supplied a hex jam nut and washer. These are used to secure the antenna in a particular direction without bottoming out the system on the threaded pole.
  • Page 24 • Decide if you need the roll measurement. If you need roll measurement, the Crescent V100 will need to be installed perpendicular to the vessel axis. If it you do not need roll measurement, install the Crescent V100 parallel with the vessel’s axis.
  • Page 25 (See Figures 1-13 to 1-15 on page 19 to page 20.) Note: Be sure to have some slack to move the cable in and out of the pole mount by a few inches (centimeters). This will allow you to connect the cable to the Crescent V100 easily.
  • Page 26 Crescent V100 Series User Guide Figure 1-13. Running cable through the pole base Figure 1-14. Running cable through the pole base...
  • Page 27 1: Installation Figure 1-15. Running cable through the pole base...
  • Page 28 Crescent V100 Series User Guide Once you have routed the cable correctly through the pole mount base and the mounting pole, the mounting assembly should look like Figure 1-16. Figure 1-16. Completed cable run...
  • Page 29 1: Installation Mounting to pole mount thread To mount the pole mount base: Thread the pole mount base onto the pole mount four to five full turns. (See Figure 1-17.) Figure 1-17. Threading the pole base onto the mount...
  • Page 30 Ensure that there is a gap between the lock nut, washer and pole mount base. This will allow you to orient the combination of the Crescent V100 and pole mount base to the vessel. (See Figure 1-18.) Figure 1-18. Pole base threaded onto mount To connect the cable to the Crescent V100: Fasten the cable to the Crescent V100 connector.
  • Page 31 1: Installation Once the cable-mount connector is fully seated, rotate the locking ring clockwise until it locks once the cable-mount connector is seated fully. You will feel the ring “click” when it is locked. (See Figure 1-19 and Figure 20.) Connector Connector Keypad...
  • Page 32 Crescent V100 Series User Guide Fastening the Crescent V100 to the pole mount base To fasten the Crescent V100 to the pole mount base with the supplied self-taping screws: Fasten the Crescent V100 enclosure to the pole mount base using the supplied self-tapping screws.
  • Page 33 Crescent V100. (See Figure 1-22.) Figure 1-22. Threading the lock nut against the pole base Orient the Crescent V100 using the sights on the top of the enclosure. Use an adjustable wrench to tighten the lock nut against the Crescent V100 while ensuring accurate alignment of the antenna system.
  • Page 34 Routing and securing the power/data cable The Crescent V100 comes with a 15 meter (16.40 yards) power/data cable (optional 30 meter (32.80 yards) power/data cable available). When choosing a route for the antenna extension cable: •...

  • Page 35: Powering The Crescent V100

    Connecting to a Power Source The first step to powering the Crescent V100 is to terminate the wires of the power cable as required. There are a variety of power connectors and terminals on the market from which to choose, depending on your specific requirements.

  • Page 36: Electrical Isolation

    (-) Once the Crescent V100 system has been installed, you are ready to turn the system on by applying power to it. The Crescent V100 smart antenna will start when an acceptable voltage is applied to the power leads of the extension cable. Be careful not to provide a voltage higher than the input range as this will damage the receiver.

  • Page 37: Connecting The Crescent V100 To External Devices

    EVICES Interfacing the Crescent V100 The Crescent V100 uses a single cable for application of power and to facilitate the input and output operations. The cable is 15 meters (16.4 yards) in length and is terminated on the receiver end with an environmentally sealed 18-pin connection.
  • Page 38 Crescent V100 Series User Guide 15 m/30 m 100 mm Strip and tin 3 mm Figure 1-24. Cable, IO-X, CIRC(F) 18-PT, 30M Table 1-2 provides the Cable, IO-X, CIRC(F) 18-PT, 15 M or 30 M Wiring. Table 1-2: Cable, IO-X, CIRC(F) 18-PT, 15M or 30M wiring...
  • Page 39 1: Installation Note: PPS is supported on pins 17 and 18 on the Crescent V100/V110, but not connected in the standard cables. Figure 1-25. Cable, IO-X, CIRC(F) 18-PT, 30M rear view Table 1-3, on page 33, provides cable, IO-X, CIRC(F) 18-PT, 15 m or 30m cable connector pin out.
  • Page 40 Crescent V100 Series User Guide Table 1-3: Cable, IO-X, CIRC(F) 18-PT, 15 m or 30M pin out Wire Signal Name Wire color number Gauge Power input + 18 AWG Power input - 18 AWG Port A TX RS232 24 AWG...

  • Page 41: Serial Port Interface

    1: Installation Serial Port Interface The Crescent V100 offers position and heading data via both RS-232 and RS-422 level serial ports. The answer of which serial port level to use resides with the serial port level(s) supported by the other electronics involved. You may find that the other electronics need either serial port level or a mixture of both.

  • Page 42: Serial Port Configuration

    Crescent V100 Series User Guide Serial Port Configuration You may configure Port A or B of the GPS receiver to output any combination of data that you wish. Port A can have a different configuration from Port B in terms of data message output, data rates, and the baud rate of the port.
  • Page 43 Figure 1-26. DB9 female socket numbering Note: For successful communications, the baud rate of the Crescent V100 serial ports must be set to match that of the devices to which they are connected. When interfacing to other devices, make sure that the transmit data output from the Crescent V100 is connected to the data input of the other device.

  • Page 44: Default Parameters

    There is likely not much reason to connect the receive data input of the Crescent V100 to another device unless it is able to send configuration commands to the V100. Since the V100 uses...
  • Page 45 1: Installation Table 1-6: Default port settings Default Baud NMEA Port update Wires rate messages rate Port A 19200 GPGGA, GPVTG, 1 Hz Blue (RS-232) GPGSV, GPZDA, BLK with BLU GPHDT, GPROT Port B 19200 GPGGA, GPVTG, 1 Hz (RS-232) GPGSV, GPZDA, BLK with BRN GPHDT, GPROT...
  • Page 46 Crescent V100 Series User Guide Table 1-7: IEC approved sentences Output Sentence Description rate GPDTM Datum reference 0 - 20 Hz* GPGBS GNSS satellite fault detection 0 - 20 Hz* GPGGA GPS fix data 0 - 20 Hz* GPGNS GNSS fix data...
  • Page 47 1: Installation * Note: 10 Hz is the standard maximum. 20 Hz is the maximum available to purchase. Note: GRS, GSA, GST and GSV support external integrity checking. They are to be synchronized with corresponding fix data (GGA or GNS). Note: The data bits, parity and stop bit are not adjustable.
  • Page 48 Crescent V100 Series User Guide Table 1-9: Available baud rates Baud Rates 4800 9600 19200 38400 Table 1-10: Correction age and elevation mask defaults Elevation Max DGPS age mask 2700 seconds ° Table 1-11: Default differential mode Crescent V100 Crescent V110...
  • Page 49 1: Installation The internal beacon module operates in full automatic mode by default as shown in the table 1-12. Table 1-12: Frequency selection Frequency MSK rate Selection selection Automatic Automatic...

  • Page 50: 2: Crescent V100 Operation

    2: C V100 RESCENT PERATION GPS Overview Understanding the Crescent V100...

  • Page 51: Gps Operation

    For your convenience, both the GPS and SBAS operation of the Crescent V100 features automatic operational algorithms. When powered for the first time, the Crescent V100 system will perform a “cold start,” which involves acquiring the available GPS satellites in view and the SBAS differential service.

  • Page 52: Differential Operation

    Crescent V100 also tracks a differential correction. The Crescent Crescent V100 uses these corrections to improve its position to less than 1 meter (1.09 yards). The Crescent V100 has an accuracy of 2.5 meters (2.7 yards) with no differential and 60 centimeters (23.6 inches) with differential.
  • Page 53 Automatic SBAS (WAAS, EGNOS, MSAS and others) Tracking The Crescent V100 will automatically scan and track SBAS signals without the need to tune the receiver. The Crescent V100 features two-channel tracking that provides an enhanced ability to maintain a lock on a SBAS satellite when more than one satellite is in view.
  • Page 54 Crescent V100 Series User Guide however, it depends on how tolerable your application is to drift, as e-Dif can be used for longer periods. Our testing has shown that accuracy will often be better than 1 meter (1.09 yards) virtually...

  • Page 55: Understanding The Crescent V100

    One antenna is designated as the Primary GPS, while the other is designated as the Secondary GPS. Positions computed by the Crescent V100 are referenced to the phase center of the Primary GPS antenna. Heading data references the vector formed from the Primary GPS antenna phase center to the Secondary GPS antenna phase center.

  • Page 56: Supplemental Sensors

    Crescent V100 Series User Guide The Crescent V100 places a constraint on the RTK solution with the prior knowledge of the fact that the Secondary GPS antenna has a fixed separation of 0.50 meters (1.64 feet) from the Primary GPS antenna inside the enclosure.

  • Page 57: Tilt Aiding

    Tilt Aiding The Crescent V100’s internal tilt sensor (accelerometer) is enabled by default, is factory calibrated, and constrains the RTK heading solution beyond the volume associated with just a fixed antenna separation, since the Crescent V100 knows the approximate inclination of the secondary antenna with respect to the primary.

  • Page 58: Gyro Aiding

    3 minutes in times of GPS loss for either antenna. If the outage lasts longer than three minutes, the gyro will be deemed to have drifted too far and the Crescent V100 will begin outputting null fields in the heading output messages. There is no user control over the time-out period of the gyro.

  • Page 59: Time Constants

    2: Crescent V100 Operation example, if you will be using the Crescent V100 on a high speed, maneuverable craft, it is essential that when gyro aiding in the Crescent V100 is first turned on and is used in an environment that has high dynamics for the first 5 to 10 minutes instead of sitting stationary.
  • Page 60 Crescent V100 Series User Guide time constant will increase the level of heading smoothing and increase lag. The pitch time constant allows you to adjust the level of responsiveness of the pitch measurement provided in the $PSAT,HPR message. The default value of this constant is 0.5 seconds of smoothing.

  • Page 61: Alarm Functionality

    2: Crescent V100 Operation LARM UNCTIONALITY A relay is located on the Type Heading Device (THD) circuit board. The relay contacts are isolated from all circuitry in the THD. The THD is connected to the coil side of the relay, but not to the contacts that are connected to the external pins through the main IO connector.

  • Page 62: Common Commands And Messages

    Tables 2-1 to 2-7, on pages 55 to 59, provide the common commands and brief description of what they do. Refer to Hemisphere GPS’ GPS Technical Reference for more details. Note: The messages have a default update rate of up to 10 Hz and optional 20 Hz with a subscription.
  • Page 63 2: Crescent V100 Operation Table 2-3: Serial port setting commands Command Description $JBAUD RS-232C, RS-422 (output) communication rate Table 2-4: NMEA messages status and update rate Command Description $GPGGA GPS fix data $GPGLL Geographic position - lat/long $GPGSA GNSS DOP and active satellites...
  • Page 64 Crescent V100 Series User Guide Table 2-4: NMEA messages status and update rate Command Description $GPHDM Magnetic heading (based on RTK-derived GPS and magnetic declination) $J4STRING Output GPGGA, GPVTG, GPGSA AND GPZDA (1 Hz MAX) Note: The GP of the message is the talker ID.
  • Page 65 2: Crescent V100 Operation Table 2-5: Heading parameters Command Description $JATT,HBIAS Set/query heading bias (-180.0 to 180.0 degrees) $JATT,PBIAS Set/query pitch/roll bias (-15.0 to 15.0 degrees) $JATT,NEGTILT Enable/disable negative tilt $JATT,ROLL Configure for roll or pitch output $JATT,NMEAHE Changed the HDT and ROT, HDM and HDG...
  • Page 66 Crescent V100 Series User Guide Table 2-7: Binary messages Message Description $JBIN1 GPS position $JBIN2 GPS DOP’s $JBIN80 SBAS $JBIN93 WAAS ephemeris data $JBIN94 Ionosphere and UTC conversion parameters $JBIN95 Ephemeris $JBIN96 Code and carrier phase $JBIN97 Process statistics $JBIN98...

  • Page 68: Appendix A: Troubleshooting

    PPENDIX ROUBLESHOOTING...
  • Page 69 (this can be done through PocketMAX or with $JSHOW in any terminal program) • Ensure that the baud rate of the Crescent V100 matches that of the receiving device • Check integrity and connectivity of power and data cable connections...
  • Page 70 • Potentially, the volume of data requested to be output by the Crescent V100 could be higher than the current baud rate supports. Try using 19,200 as the baud rate for all devices or reduce the amount of data being output No GPS lock •...
  • Page 71 Port A will cause the receiver to expect the corrections to be input through Port B No SBAS lock • Verify Crescent V100’s clear view of the sky • Verify the lock status of SBAS satellites (this can be done with PocketMAX - monitor BER value) •...
  • Page 72 • Heading is from Primary to incorrect heading Secondary antenna, so the arrow on value the underside of the Crescent V100 should be directed to the bow side • $JATT,SEARCH command forces the Crescent V100 to acquire a new heading solution (unless gyro is enabled) •...

  • Page 74: Appendix B: Specifications

    PPENDIX PECIFICATIONS...
  • Page 75 Appendix B: Specifications B: Specifications Table B-1 to B-6, on pages 68 to 70, provides the Crescent V100’s communication, beacon sensor, GPS sensor, mechanical, power and environmental specifications. Table B-1: Communication specifications Item Specification Serial ports 2 full duplex RS-232 and 2 half-duplex...
  • Page 76 Crescent V100 Series User Guide Table B-3: GPS sensor specifications Item Specification Receiver type L1, C/A code with carrier phase smoothing Channels Two 12-channel, parallel tracking (two 10-channel when tracking SBAS) Update Rate Standard 10 Hz, optional 20 Hz (position and heading) Horizontal accuracy <...
  • Page 77 Appendix B: Specifications Table B-4: Mechanical specifications Item Specification Enclosure UV resistant, white plastic (AES HW 600G) (Non-corrosive, self extinguishing) Power/data connector 18-pin, environmentally sealed Dimensions 60 cm L x 16 cm W x 18 cm H (not including mounts) (23.6 in L x 6.3 in W x 7.1 in H) Weight 1.50 kg (3.3 lb)
  • Page 78 Crescent V100 Series User Guide Note: This is the minimum safe distance measured when the product is placed in the vicinity of the steering magnetic compass. The ISO 694 defines “vicinity,” relative to the compass as within 5 meter (5.47 yards) separation.

  • Page 80: Appendix C: Parts List

    PPENDIX ARTS...
  • Page 81 Appendix C: Parts List C: Parts List Table C-1 to C-3, on pages 74 and 75, provides the Crescent V100 parts list. Note: The Crescent V100 parts comply with IEC 60945’s section 4.4: “exposed to the weather.” Table C-1: Equipment...
  • Page 82 Crescent V100 Series User Guide Table C-3: Documentation Part number Description Quantity Warranty page 875-0174 Crescent V100 Series User Guide 875-0185 Crescent V100 Series User Guide...

  • Page 84: Index

    Crescent V100 Series User Guide RS-422 30, 34, 35, 37, 56, 68 NDEX Serial Port Configuration 35 Understanding the Crescent V100 Alarm Functionality 54 48–53 Alarm Signal 54 Gyro Aiding 51–52 Watchdog 54 Moving Base Station RTK 48– Beacon Operation 46 Common Commands and Mes- Supplemental Sensors 49–50...
  • Page 86 www.hemispheregps.com e-mail: info@hemispheregps.com...

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