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GPS 35 LP TracPak TM GPS SMART ANTENNA TECHNICAL SPECIFICATION Models: GPS35-LVC GPS35-LVS GPS35-HVS ____________________________________________________________ GARMIN · 1200 E.
ii © 2000 GARMIN Corporation, 1200 E. 151st Street, Olathe, KS 66062 All rights reserved. No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, for any purpose without the express written permission of GARMIN.
iii CAUTION The GPS system is operated by the government of the United States which is solely responsible for its accuracy and maintenance. Although the GPS 35LP is a precision electronic NAVigation AID (NAVAID), any NAVAID can be misused or misinterpreted, and therefore become unsafe.
iv TABLE OF CONTENTS 1. Introduction 1 1.1 Overview 1 1.2 Features 1 1.3 Naming Conventions 2 1.4 Technical Specifications 2 1.5 Application 4 2. Operational Characteristics 5 2.1 Self Test 5 2.2 Initialization 5 2.3 Navigation 5 2.4 Satellite Data Collection 6 3.
1 SECTION 1 INTRODUCTION 1.1 OVERVIEW The GARMIN GPS 35LP is a complete GPS receiver, including an embedded antenna, designed for a broad spectrum of OEM (Original Equipment Manufacturer) system applications.
2 10) Binary Format Phase Data Output on TXD2 11) Flexible input voltage levels of 3.6Vdc to 6 .0Vdc with overvoltage protection in the - LVx versions, and 6.0Vdc to 40Vdc in the - HVx versions. 12) FLASH based program memory. New software revisions upgradeable through serial interface.
3 2) Input current : 120 mA typical 140 mA max - LVx versions, 20 mA while in power down. 870mW typical 1000mW max - HVx version, 300uA while in power down. 3) Backup power : 3V Rechargeable Lithium cell battery, up to 6 month charge. 4) Power Down Input: 2.
4 4) One-pulse-per-second timing output 5) Binary Format Phase Data 1.5 APPLICATION Fig. 1, TYPICAL APPLICATION ARCHITECTURE.
5 SECTION 2 OPERATIONAL CHARACTERISTICS This section describes the basic operational characteristics of the GPS 35LP. Additional information regarding input and output specifications are contained in Section 4.
6 1) Latitude/longitude/altitude 2) Velocity 3) Date/time 4) Error estimates 5) Satellite and receiver status Normally the GPS 35LP will select the optimal navigation mode (2D or 3D) based on available satellites and geometry considerations.
7 minutes to calculate a navigation solution. AutoLocate ™ , unlike search the sky, does not require that the receiver continue to operate after a fix has been obtained.
8 SECTION 3 HARDWARE INTERFACE 3.1 MECHANICAL DIMENSIONS The GPS 35LP is a complete GPS receiver including antenna in a uniquely styled waterproof package.
9 3.2 MOUNTING CONFIGURATIONS AND OPTIONS The following mounting options are available for the GPS 35LP. Mounting is user configurable. 3.2.1 Magnetic Mount The magnetic mount provides a firm, removable mounting attachment to any ferrous metal surface.
10 3.2.2 Trunk Lip Mount The trunk lip mount provides a semi-permanent attachment to the trunk lip of most automobiles. Fig. 4, Trunk Lip Mount Attachment.
11 3.2.3 Suction Cup Mount The suction cup bracket provides a removable mounting surface attached to the inside of a vehicle's windshield. Fig. 5, Suction Cup Mount Attachment.
12 3.2.4 Flange Mount The flange mount allows for a permanent installation on a flat surface. This mounting configuration is ideal in applications in which the far side of the mounting surface is inaccessible.
13 3.3 CONNECTION WIRING DESCRIPTION The GPS 35LP features a stripped and pre-tinned cable assembly for connection flexibility. The following is a functional description of each wire in the cable assembly. Red: Vin - Regulated +3.6V to +6V, 150 mA (maximum) in the - LVx versions.
14 Software Interface The GPS 35LP interface protocol design is based on the National Marine Electronics Association’s NMEA 0183 ASCII interface specification, which is fully defined in “NMEA 0183, Version 2.0” (copies may be obtained from NMEA, P.
15 4.1.2 Sensor Initialization Informati on (PGRMI) The $PGRMI sentence provides information used to initialize the sensor board set position and time used for satellite acquisition. Receipt of this sentence by the board set causes the software to restart the satellite acquisition process.
16 All configuration changes take effect after receipt of a valid value except baud rate and PPS mode. Baud rate and PPS mode changes take effect on the next power cycle or an external reset event.
17 4) $PGRMO ,GPALM,1 will cause the sensor board to transmit all stored almanac information. All other NMEA sentence transmission will be temporarily suspended. 4.1.6 Tune DGPS Beacon Receiver (PSLIB) The $PSLIB sentence provides the ability to tune a GARMIN GBR-21 or equivalent beacon receiver.
18 4.2 NMEA Transmitted Sentences The subsequent paragraphs define the sentences which can be transmitted on TXD1 by the GPS 35LP receivers. 4.2.1 Sentence Transmission Rate Sentences are transmitted with respect to the user selected baud rate.
19 4.2.2 Transmitted Time The GPS 35LP receivers output UTC (Coordinated Universal Time) date and time of day in the transmitted sentences. Prior to the initial position fix, the date and time of day are provided by the on- board clock.
20 <6> GPS quality indication, 0 = fix not available, 1 = Non-differential GPS fix available, 2 = Differential GPS (DGPS) fix available 6 = Estimated <7> Number of satellites in use, 00 to 12 (leading zeros will be transmitted) <8> Horizontal dilution of precision, 0.
21 <12> Mode indicator (only output if NMEA 2.30 active), A = Autonomous, D = Differential, E = Estimated, N = Data not valid 4.2.8 Track Made Good and Ground Speed with GPS Talker ID (VTG) The .
22 $PGRMF ,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,<10>,<11>,<12>,<13>,<14>,<15>*hh<CR><LF> <1> .
23 4.3 Baud Rate Selection Baud rate selection can be performed by sending the appropriate configuration sentence to the sensor board as described in the NMEA input sentences selection. (Section 4.1) 4.4 One-Pulse-Per-Second Output The highly accurate one-pulse-per-second output is provided for applications requiring precise timing measurements.
24 Appendix A Earth Datums The following is a list of the GARMIN GPS 35LP earth datum indexes and the corresponding earth datum name (including the area of application): 0 ADINDAN - Ethiopia, Mali, Se.
25 42 KANDAWALA - Sri Lanka 43 KERGUELEN ISLAND - Kerguelen Island 44 KERTAU 1948 - West Malaysia, Singapore 45 L.C. 5 ASTRO - Cayman Brac Island 46 LIBERIA 1964 - Liberia 47 LUZON - Mindanao Island 4.
26 91 SOUTHEAST BASE - Porto Santo and Madeira Islands 92 SOUTHWEST BASE - Faial, Graciosa, Pico, Sao Jorge, and Terceira Islands (Azores) 93 TIMBALAI 1948 - Brunei and East Malaysia ( Sarawak and Sab.
27 Appendix B GPS 35LP Evaluation Kits GPS 35LP evaluation materials kit (part number 010-10186-00) is available from Garmin International. This kit includes two DB-9 connectors with solder pots, various mounting brackets, hookup wire, technical specification, and software to monitor the GPS 35LP outputs and configure the receiver.
28 GPS25PM.EXE The Garmin Phase Monitor Program, GPS25PM.EXE , provides the following functions: - Display and log phase data output from TXD2 - Upload almanac, position, and time information via RXD2 - Download almanc and ephemeris information upon command GPS25PM.
29 Appendix C Phase Output Data Binary Format Two records are transmitted once per second by the GPS 35LP. One record contains primarily post- process information such as position and velocity information. The second record contains receiver measurement information.
30 lat Latitude ( rad) lon Longitude ( rad) lon _vel Longitude velocity ( mt/sec) lat _vel Latitude velocity ( mt/sec) alt _vel Altitude vel ocity ( mt/sec) Receiver Measurement Record - 0x10 ( dle is.
31 dle and etx bytes: Software written to receive the two records should filter dle and etx bytes as described below: typedef enum { dat, dle, etx } rx _state_type; char in_que[256]; int in_que_ptr = .
32 GARMIN Phase Monitor Program - gps25pm.exe Command Line Arguments default: /com1 - selects which PC serial port to use for communication - com1, com2 (com1 default). /b :9600 - selects the baud rate - 1200, 2400, 4800, or 9600 (9600 default) Description: GPS25PM.
33 The bottom section contains program messages. Upload and download status messages will appear here as well as any program error messages. Commands: D - Download Almanac: The GPS25 sensor will be sent a command to download almanac information. GPS25PM.
34 File Formats ALMANAC.DAT Example almanac entry: **** Week 794 almanac for PRN-01 ************ ID: 01 Health: 000 Eccentricity: 3 .414630890E-003 Time of Applicability(s) : 380928.0000 Orbital Inclination( rad): 9.549833536E-001 Rate of Right Ascen(r/s) : -7.
35 Ephemeris Record - 0x10 ( dle is first byte) - 0x2A (ephemeris record identifier) - 0x74 (size of data) - eph _type (see description below) - one byte chksum (the addition of bytes between the deli.
36 TIM time_of_week week_number RCV svid snr (T )rack/(C) ycle_slip phase pseudo_range cycles PVT time lat lon alt lat_vel lon_vel alt_vel epe eph epv TIM 235537.99855650 794 RCV 18 50 T 120.2 19964528.44 2068193 RCV 29 50 T 133.2 20364313.25 1950557 RCV 28 45 T 176.
37 GARMIN Corporation 1200 East 151st Street Olathe, KS 66062 (913 )397-8200 (913 )397-8282 FAX 190-00148-00 Rev. E.
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