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Hemisphere GPS Crescent A100 User Manual

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Crescent A100
User Guide
Part No. 875-0163-000 Rev. C1

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Summary of Contents for Hemisphere GPS Crescent A100

  • Page 1 Crescent A100 User Guide Part No. 875-0163-000 Rev. C1...
  • Page 2 Hemisphere GPS Inc. RADEMARKS 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: Warranty Notice

    GPS approved service center shall render this warranty null and void. Hemisphere GPS does not warrant claims asserted after the end of the warranty period. Hemisphere GPS does not warrant or guarantee the precision or accuracy of positions obtained when using Products. Products are not intended for primary navigation or for use in safety of life applications.
  • Page 5 Obtaining Warranty Service In order to obtain warranty service, the end purchaser must bring the Product to a Hemisphere GPS approved service center along with the end purchaser's proof of purchase. For any questions regarding warranty service or to obtain information regarding the location of any of Hemisphere GPS'...

  • Page 6: Table Of Contents

    Crescent A100 Placement 7 Mounting the Crescent A100 ....10 Powering the Crescent A100 ....13 Connecting the Crescent A100 to External Devices .
  • Page 7 B: Specifications ......28 D: Crescent A100 Accessories ... . . 32...

  • Page 8: Installation

    1: Installation Features Installation Mounting the Crescent A100 Powering the Crescent A100 Connecting Crescent A100 to External Devices...

  • Page 9: Introduction

    Introduction Congratulations on buying Hemisphere GPS’ new Crescent A100. The Crescent A100 is a smart antenna that tracks GPS and SBAS (WAAS and EGNOS) signals. The Crescent A100 provides sub-meter performance with50 centimeter accuracy 95% of the time. This chapter provides information on the following: •...

  • Page 10: Features

    Crescent A100 User Guide Features The Crescent A100 has several new features that will enhance your product’s performance. The main features are: • 2 RS232 serial ports • • Radar-simulated pulse output • CAN communication RS232 Serial Port The RS232 serial is used for NMEA 0183, Hemisphere GPS interface protocol, RTCM SC-104 and upgrading firmware.
  • Page 11 1: Installation The Crescent A100 uses pin 12 for the speed out pin. Pin 12 will output a square wave with a 50% duty cycle. The frequency of the square wave varies directly with speed. 94 Hz represents a speed of 1 meter per second, or a 28.65 pulse per foot traveled.

  • Page 12: Installation

    Crescent A100 User Guide Installation The Crescent A100 is a smart antenna that tracks GPS and SBAS (WAAS and EGNOS). It utilizes Hemisphere GPS’ exclusive COAST ™ technology during differential outages. The Crescent A100 is also ® ® capable of using Hemisphere GPS’ e-Dif and L-Dif technology.

  • Page 13: Cable Interface

    Power Additional extension cables may be purchased, as necessary, for other installations. This allows the Crescent A100 to be quickly and easily moved form one installation to another. If an extension cable is damaged in the field, it can be replaced without returning the complete Crescent A100 system.

  • Page 14: Extension Power/Data Cable

    Crescent A100 User Guide Extension Power/Data Cable The Crescent A100 system is quickly installed with one of the various extension cables. The location of the extension cable should be made with the following requirements in mind: • Power leads at the “Y” end must reach a power source.
  • Page 15 This will ensure that GPS satellites are not masked by obstructions, which can potentially reduce system performance. To place the Crescent A100: Mount the Crescent A100 on, or as close to, the center of your point of measurement. Position the Crescent A100 as high as possible.
  • Page 16 Crescent A100 User Guide Figure 1-2. Crescent A100 placement on a vehicle...

  • Page 17: Mounting The Crescent A100

    1: Installation Mounting the Crescent A100 The Crescent A100 can be mounted in several ways: • Magnetic mount • Surface mount • Pole mount Magnetic Mount The magnetic mount can be screwed into the bottom of the Crescent A100 and mounts to metal surfaces. A metal disc and foam adhesive are included with each magnetic mount.
  • Page 18 Crescent A100 User Guide Place the Crescent A100 on top of the metal disc. (See Figure 1-3 for the magnetic mounted Crescent A100.) Figure 1-3. Magnetic mounted Crescent A100 Surface Mount As an alternative to the magnetic mount, the Crescent A100 is easily attached to the surface with four machine screws (no.
  • Page 19 Warning: Install the Crescent A100 only hand-tight. Damage resulting from overtightening the Crescent A100 is not covered by warranty. Pole Mount The center thread of the Crescent A100 is 5/8 inches for compatibility with a survey pole (not included).

  • Page 20: Powering The Crescent A100

    Be careful not to provide a voltage higher than the input range. This will damage the antenna. The Crescent A100 accepts an input voltage between 7 and 36 VDC via the cable. For best performance, the supplied power should be continuous and clean.
  • Page 21 This may vary depending where you are in the world. Note: The Crescent A100 can take up to five minutes for a full ionoshperic map to be received from SBAS. Optimum accuracy will be obtained once the Crescent A100 is processing corrected...

  • Page 22: Devices

    Crescent A100 User Guide Connecting the Crescent A100 to External Devices The serial ports of the Crescent A100 operates at the RS-232C interface level to communicate with external data loggers, navigation systems and other devices. The serial ports are accessible via the extension cable that features a DB9 female data connector.
  • Page 23 Transmit Crescent A100 NMEA 0183, binary and RTCM Receive Crescent A100 NMEA 0183, binary and RTCM input Signal ground Factory parameters Tables 1-4 to 1-6 identify the default Crescent A100 configuration. Table 3-4: DGPS Application 1 SBAS (WAAS, EGNOS, etc.) Application 2 e-Dif (unsubscribed)
  • Page 24 10 Hz receiver) Custom Configuring the Crescent A100 All aspects of the Crescent A100 may be configured through the serial port with the use of Hemisphere GPS commands. The user can configure the following items: •...

  • Page 25: Environmental Considerations

    1: Installation Environmental Considerations The Crescent A100 is designed to withstand various outdoor environments. However, there are specific environmental limits that you should meet when storing and using the Crescent A100. See Table B-4: Environmental specifications in Appendix B.

  • Page 26: 2: Gps Overview

    2: GPS Overview GPS Operation Differential Operation...

  • Page 27: Gps Overview

    Crescent A100 are pre-configured. The receiver will work out of the box, and for most applications, little user set up is necessary. When powered for the first time, the Crescent A100 will perform a “cold start, ” which involves acquiring the available GPS satellites in view and the SBAS differential service.

  • Page 28: Differential Operation

    Positioning • Satellite acquisition quality When the Crescent A100 is properly positioned on your vehicle, the satellites transmit coded information to the antenna in a specific frequency that allows the receiver to calculate a range to each satellite. GPS is essentially a timing system. The ranges are calculated by timing how long it takes for the GPS signal to reach the GPS antenna.
  • Page 29 EGNOS is a similar service that is available in Europe and Western Russia. Automatic SBAS tracking - The Crescent A100 will automatically scan and track the satellite signals. This automatic tracking allows you to focus on other aspects of differential operation without the need to tune the receiver.
  • Page 30 Crescent A100 User Guide e-Dif requires a subscription. Once the Hemisphere GPS e-Dif capable Crescent A100 computes a differential correction. The user can operate for unlimited time and provide good relative accuracy. Alternatively, the operator can regularly update e-Dif to maintain...
  • Page 31 2: GPS Overview...

  • Page 32: Appendix

    Appendix Troubleshooting Crescent A100 Specifications Network Crescent A100 accessories Surface mount template...

  • Page 33: A: Troubleshooting

    Appendix A: Troubleshooting Table A-1 provides a checklist to troubleshoot common problems and their solutions for the Crescent A100. Table A-1: Troubleshooting Problem Possible solution Receiver fails to • Verify polarity of power leads power • Check integrity of power cable connections •...
  • Page 34 Crescent A100 User Guide Table A-1: Troubleshooting Problem Possible solution No SBAS lock • Check integrity of cable connections • Verify Crescent A100’s unobstructed view of the sky • Check SBAS visibility map...

  • Page 35: B: Specifications

    Appendix B: Specifications Table B-1 to B-5 provides the power, mechanical, communication, environmental and DGPS specifications for the Crescent A100. Table B-1: Power specifications Item Specification Input voltage 7 - 36 VDC Power consumption < 2 W @ 12 VDC (typical)
  • Page 36 Crescent A100 User Guide Table B-3: Communication specifications Item Description Serial ports 2 full duplex RS232 NMEA 2000 broadcast Pulse output 1 PPS (HCMOS, active high, rising edge sync) Baud rates 4800 - 57600 Differential correction RTCM SC-104 I/O protocol...
  • Page 37 Appendix Table B-4: Environmental specifications Item Specification Humidity 100% Enclosure Waterproof and dust proof Compliance FCC, CE Shock IEC 68-2-27 Vibration ISO 16750-1 EMI certification FCC part 15, E-Mark Table B-5: GPS sensor specifications Item Specification Receiver type L1, C/A code with carrier phase smoothing (Patented COAST technology during differential signal outage) Channels...
  • Page 38 Crescent A100 User Guide * Depends on multipath environment, number of satellites in view, satellite geometry, baseline length (for local services) and ionspheric activity **Depends on multipath environment, number of satellites in view, satellite geometry and ionspheric activity.

  • Page 39: D: Crescent A100 Accessories

    875-0066 Warranty Table D-3: Crescent A100 cable accessories Part Number Cables 051-0129 Cable, Crescent A100 power, single port DB9, 3 m (10 ft) 051-0130 Cable: Crescent A100 power, dual port DB-9, 3 m (10 ft) 051-0132 Cable: Guidance console port, single port DB9,...
  • Page 40 Crescent A100 User Guide Table D-3: Crescent A100 cable accessories Part Number Cables 051-0134 Cable adaptor converts 051-0132 guidance console port to a console port and speed port 051-0136 Cable adaptor converts 051-0132 guidance console port to DB9 and speed port...
  • Page 41 Appendix This page is intentionally left blank...

  • Page 42: E: Surface Mount Template

    Crescent A100 User Guide E: Surface Mount Template The following template should be used to plan for the location of the mounting holes used when surface mounting the Crescent A100.
  • Page 43 Appendix This page is intentionally left blank.
  • Page 44 www.hemispheregps.com e-mail: info@hemispheregps.com...

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