REFERENCE MANUAL - FTP Directory Listing - Trimble

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INTERFACE CHARACTERISTICS 3 Serial Port Default Settings The Copernicus GPS Receiver supports two serial ports. The default settings are provided in the table below. Table 3.4 Copernicus GPS Receiver Serial Port Default Settings Port Port Direction Pin # Protocol Characteristics Baud Rate Data Bits Parity Stop Bits Flow Control A TXD-A 23 TSIP-Out 38.4 K 8 None 1 NO RXD-A 21 TSIP-IN 38.4 K 8 None 1 NO B TXD-B 24 NMEA-Out 4800 8 None 1 NO RXD-B 20 NMEA-IN 4800 8 None 1 NO Note – Data Bits, Parity, Stop Bits and Flow Control are not configurable. Only Protocol and Baud rates are configurable. Detailed descriptions of these protocols are defined in the Appendices. Copernicus GPS Receiver 47
3 INTERFACE CHARACTERISTICS GPS Timing In many timing applications, such as time/frequency standards, site synchronization systems, and event measurement systems, GPS receivers are used to discipline local oscillators. The GPS constellation consists of 24 orbiting satellites. Each GPS satellite contains a highly-stable atomic (Cesium) clock, which is continuously monitored and corrected by the GPS control segment. Consequently, the GPS constellation can be considered a set of 24 orbiting clocks with worldwide 24-hour coverage. GPS receivers use the signals from these GPS clocks to correct their internal clock which is not as stable or accurate as the GPS atomic clocks. GPS receivers like the Copernicus GPS output a highly accurate timing pulse (PPS) generated by an internal clock which is constantly corrected using the GPS clocks. This timing pulse is synchronized to UTC within ±100 ns rms. In addition to serving as a highly accurate stand-alone time source, GPS receivers are used to synchronize distant clocks in communication or data networks. This synchronization is possible since all GPS satellite clocks are corrected to a common master clock. Therefore, the relative clock error is the same, regardless of which satellite or satellites are used. For timing applications requiring a common clock, GPS is the ideal solution. Position and time errors are related by the speed of light. Therefore, a position error of 100 meters corresponds to a time error of approximately 333 ns. The hardware and software implementation affects the GPS receiver's PPS accuracy level. The receiver's clocking rate determines the PPS steering resolution. Serial Time Output Time must be taken from the timing messages in the TSIP, TAIP, or NMEA protocols because position messages contain a timestamp which is usually 1 to 2 seconds in the past. Table 3.5 Serial Time Output Protocol Timing Message TSIP Report packets 41 and 8F-21 TAIP TM message NMEA ZDA message Note – GPS time differs from UTC (Universal Coordinated Time) by a variable, integer number of seconds UTC=(GPS time)-(GPS UTC offset). As of January 2006, the GPS UTC offset was 14 seconds. The offset has historically increased by 1 second about every 18 months. System designers should plan to read the offset value as a part of the timing interface to obtain UTC. The GPS week number is in reference to a base week (Week #0), starting January 6, 1980. 48 Copernicus GPS Receiver
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REFERENCE MANUAL Copernicus GPS Re
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Corporate Office Trimble Navigation
Page 6 and 7: Table of Contents Table of Contents
Page 8 and 9: Table of Contents 7 MECHANICAL SPEC
Page 10 and 11: Table of Contents Command Packet 0x
Page 12 and 13: Table of Contents X1 Extended Statu
Page 14 and 15: CHAPTER 1 STARTER KIT 1 In this cha
Page 16 and 17: STARTER KIT 1 Starter Kit The Coper
Page 18 and 19: STARTER KIT 1 Figure 1.3 USB Cable
Page 20 and 21: STARTER KIT 1 Interface Connections
Page 22 and 23: STARTER KIT 1 Removing the Referenc
Page 24 and 25: STARTER KIT 1 Quick Start Guide 1.
Page 26 and 27: STARTER KIT 1 Trimble GPS Monitor T
Page 28 and 29: STARTER KIT 1 4. Click the Device M
Page 30 and 31: STARTER KIT 1 Connect to the GPS Re
Page 32 and 33: STARTER KIT 1 Configure GPS Ports 1
Page 34 and 35: STARTER KIT 1 Configure PPS Output
Page 36 and 37: STARTER KIT 1 Creating a Log Follow
Page 38 and 39: STARTER KIT 1 3. Select one of the
Page 40 and 41: CHAPTER 2 PRODUCT DESCRIPTION 2 In
Page 42 and 43: PRODUCT DESCRIPTION 2 Block Diagram
Page 44 and 45: PRODUCT DESCRIPTION 2 Electrical El
Page 46 and 47: PRODUCT DESCRIPTION 2 Absolute Mini
Page 48 and 49: PRODUCT DESCRIPTION 2 Power Consump
Page 50 and 51: CHAPTER 3 INTERFACE CHARACTERISTICS
Page 52 and 53: INTERFACE CHARACTERISTICS 3 Pin Des
Page 54 and 55: INTERFACE CHARACTERISTICS 3 Table 3
Page 58 and 59: INTERFACE CHARACTERISTICS 3 Acquiri
Page 60 and 61: INTERFACE CHARACTERISTICS 3 Enablin
Page 62 and 63: CHAPTER 4 OPERATING MODES 4 In this
Page 64 and 65: OPERATING MODES 4 Changing the Run/
Page 66 and 67: OPERATING MODES 4 Serial Port Activ
Page 68 and 69: OPERATING MODES 4 Saving Almanac, E
Page 70 and 71: CHAPTER 5 APPLICATION CIRCUITS 5 In
Page 72 and 73: APPLICATION CIRCUITS 5 Figure 5.2 P
Page 74 and 75: APPLICATION CIRCUITS 5 • Antenna
Page 76 and 77: APPLICATION CIRCUITS 5 Following is
Page 78 and 79: CHAPTER 6 RF LAYOUT CONSIDERATIONS
Page 80 and 81: RF LAYOUT CONSIDERATIONS 6 In the p
Page 82 and 83: RF LAYOUT CONSIDERATIONS 6 PCB Cons
Page 84 and 85: RF LAYOUT CONSIDERATIONS 6 Striplin
Page 86 and 87: CHAPTER 7 MECHANICAL SPECIFICATIONS
Page 88 and 89: MECHANICAL SPECIFICATIONS 7 Solderi
Page 90 and 91: MECHANICAL SPECIFICATIONS 7 Paste M
Page 92 and 93: CHAPTER 8 PACKAGING 8 In this chapt
Page 94 and 95: PACKAGING 8 Reel The 13-inch reel t
Page 96 and 97: CHAPTER 9 SHIPPING and HANDLING 9 I
Page 98 and 99: SHIPPING and HANDLING 9 Moisture Pr
Page 100 and 101: SHIPPING and HANDLING 9 Recommended
Page 102 and 103: SHIPPING and HANDLING 9 Grounding t
Page 104 and 105: CHAPTER 10 COPERNICUS REFERENCE BOA
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COPERNICUS REFERENCE BOARD 10 IMAGE
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COPERNICUS REFERENCE BOARD 10 Refer
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CHAPTER 11 FIRMWARE UPGRADE 11 In t
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FIRMWARE UPGRADE 11 Firmware Binary
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FIRMWARE UPGRADE 11 Pseudo-Code Exp
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FIRMWARE UPGRADE 11 Error Recovery
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FIRMWARE UPGRADE 11 Packet ID - 0x8
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FIRMWARE UPGRADE 11 Packet ID - 0x8
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FIRMWARE UPGRADE 11 Loading Firmwar
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APPENDIX A TRIMBLE STANDARD INTERFA
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TRIMBLE STANDARD INTERFACE PROTOCOL
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APPENDIX B TRIMBLE ASCII INTERFACE
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TRIMBLE ASCII INTERFACE PROTOCOL (T
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APPENDIX C NMEA 0183 C In this appe
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NMEA 0183 C The NMEA 0183 Communica
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NMEA 0183 C Note - Spaces are only
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NMEA 0183 C General NMEA Parser Req
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NMEA 0183 C Table C.4 Copernicus GP
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NMEA 0183 C GLL - Geographic Positi
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NMEA 0183 C RMC - Recommended Minim
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NMEA 0183 C AH - Almanac Health Thi
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NMEA 0183 C AS - Almanac Status Thi
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NMEA 0183 C EP - Ephemeris This sen
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NMEA 0183 C IO Ionosphere This sent
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NMEA 0183 C PS - PPS Configuration
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NMEA 0183 C RT - Reset This sentenc
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NMEA 0183 C Table C.29 SG - Set Bit
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NMEA 0183 C TF - Receiver Status an
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NMEA 0183 C VR - Version This sente
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