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USER GUIDE
®
AgGPS 332 GPS Receiver
56370-00_332GPS_reciever_MC_7.25x9_0805.indd 1 15/08/2005 9:28:10 a.m.
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Trimble Navigation Limited Trimble Navigation Limited Trimble Navigation Limited Agriculture Business Area Corporate Headquarters Agriculture Business Area 7401 Church Ranch Blvd 935 Stewart Drive Water Management Division Westminster, CO 80021 Sunnyvale, CA 94085, 5475 Kellenburger Road USA USA Dayton, Ohio, 45424-1099 +1-913-495-2700 Phone +1-408-481-8000 Phone USA +1-937-233-8921 Phone w w w . t r i m b l e . c o m 56370-00_332GPS_reciever_MC_7.25x9_0805.indd 2 15/08/2005 9:28:10 a.m.
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USER GUIDE ® AgGPS 332 GPS Receiver Version 1.00 Revision A Part number 56370-00-ENG September 2005
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Corporate Office For purposes of this warranty the following definitions shall apply: (1) “Fix Update” means an error correction or other Trimble Navigation Limited update created to fix a previous software version that does 645 North Mary Avenue not substantially conform to its published specifications; (2) PO Box 3642 “Minor Update” occurs when enhancements are made to Sunnyvale, CA 94085 current features in a software program; and (3) “Major USA Upgrade” occurs when significant new feat
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THE FOREGOING LIMITED WARRANTY TERMS STATE limits are designed to provide reasonable protection against TRIMBLE'S ENTIRE LIABILITY, AND YOUR EXCLUSIVE harmful interference in a residential installation. This REMEDIES, RELATING TO PERFORMANCE OF THE equipment generates, uses, and can radiate radio frequency TRIMBLE PRODUCT. EXCEPT AS OTHERWISE EXPRESSLY energy and, if not installed and used in accordance with the PROVIDED HEREIN, THE PRODUCT AND instructions, may cause harmful interference to
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Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . 1 Welcome . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 About the Product . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Related Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
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Contents Optional components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Mounting the Receiver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Choosing a location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Environmental conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Electrical interfe
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Contents OmniSTAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 WAAS/EGNOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Configuring the AgGPS Receiver to Operate in Beacon Mode . . . . . . . . . . 49 Configuring the AgGPS Receiver to Operate in RTK Mode . . . . . . . . . . . . 50 Configuring the Communication Ports . . . . . . . . . .
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Contents C NMEA-0183 Messages . . . . . . . . . . . . . . . . . 77 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 NMEA-0183 Message Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 Symbols and delimiters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 Checksum values . . . . . . . . . . .
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CHAPTER 1 Introduction 1 In this chapter: Welcome About the Product Related Information Technical Assistance Your Comments AgGPS 332 GPS Receiver User Guide 1
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1 Introduction 1.1 Welcome ® This manual describes how to install and configure the Trimble ® AgGPS 332 receiver. Even if you have used other Global Positioning System (GPS) products before, Trimble recommends that you spend some time reading this manual to learn about the special features of this product. If you are not familiar with GPS, visit the Trimble website (www.trimble.com) for an interactive look at Trimble and GPS. 1.2 About the Product The AgGPS 332 receiver is an innovative
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APPENDIX 2 Overview 2 In this chapter: Introduction Receiver Connections Receiver Input/Output GPS Positioning Methods AgGPS 332 GPS Receiver User Guide 3
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2 Overview 2.1 Introduction This chapter describes the AgGPS 332 receiver and gives an overview of GPS, DGPS, and related information. The AgGPS 332 receiver combines high-performance GPS reception with a DGPS-capable receiver in a lightweight, durable housing. The AgGPS 332 receiver also contains the ultimate choice in technology enabling WAAS/EGNOS, OmniSTAR, or Coast Guard Beacon Tower real-time differential capabilities. When used with a Real-Time Kinematic (RTK) base statio
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Overview 2 21.1 Standard Features A standard AgGPS 332 receiver provides the following features: • 10 Hz (10 positions per second) output rate • 12 GPS (C/A-code, L1and L2) tracking channels, code carrier channels • Submeter differential accuracy (RMS), assuming at least five satellites and a PDOP (Position Dilution of Precision) of less than 1 four (when used with SBAS correction) • LED display • Outputs a 1 PPS (pulse per second) strobe signal on both ports. This signal enables an ext
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2 Overview 2.2 Receiver Connections Figure 2.1 shows the connector ports on the AgGPS 332 receiver. Figure 2.1 AgGPS 332 receiver connector ports The two connectors (Port A and Port B) can perform the following functions: • accept power • accept TSIP, RTCM, ASCII, and (if enabled) CMR inputs • output RTCM, TSIP, and NMEA messages • output 1 PPS signals • provide support for the J1939 (CAN) serial bus For more information about the inputs, outputs, and LCD display, see the information in t
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Overview 2 2.3 Receiver Input/Output The AgGPS 332 receiver data/power cable (P/N 30945) connects to a receiver connector port to supply power. It also enables the following data exchanges: • TSIP, RTCM, and ASCII input from an external device The receiver is able to receive ASCII data from an external device, convert this data into an NMEA message, and export the message to another device. TSIP command packets configure and monitor GPS and DGPS parameters. The receiver is also able to
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2 Overview • 1 PPS output To synchronize timing between external instruments and the internal clock in the receiver, the connection port outputs a strobe signal at 1 PPS (pulse per second). To output this signal, the receiver must be tracking satellites and computing GPS positions. • J1939 (CAN) bus Both connection ports on the receiver support the J1939 Controller Area Network (CAN) bus protocol. This protocol standardizes the way multiple microprocessor-based electronic control unit
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Overview 2 2.4 GPS Positioning Methods GPS positioning systems are used in different ways to provide different levels of accuracy. Accuracy is measured in absolute terms (you know exactly where you are in a fixed reference frame). Table 2.1 summarizes the GPS positioning methods. Imperial units in this table are rounded to two decimal places. The values shown are 2sigma. Table 2.1 Absolute accuracy of GPS positioning method GPS positioning Corrections used Approximate absolute accuracy m
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2 Overview A transmitter in the base station sends the corrections through a radio link to the rover radio, which sends the corrections to the AgGPS 332 receiver. The rover receiver uses RTK corrections from the base station to calculate its position to centimeter-level accuracy. As part of this process, the rover receiver must calculate an initialization. This takes a few seconds. While the receiver is initializing, an RTK Float solution is generated. Once initialized, an RTK Fixed so
