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Garmin GP35-LVS manual

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Table of contents for the manual

  • Page 1

    GPS 35 LP TracPak TM GPS SMART ANTENNA TECHNICAL SPECIFICATION Models: GPS35-LVC GPS35-LVS GPS35-HVS ____________________________________________________________ GARMIN · 1200 E. 151st Street · Olathe, Kansas 66062 · (913) 397-8200 · (913) 397-8282 FAX[...]

  • Page 2

    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. Information in this document is subject to c[...]

  • Page 3

    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. Use the GPS 35LP at your own risk. To reduce the risk, carefull[...]

  • Page 4

    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. Hardware Interface 8 3.1 Mechanical Dimensions 8 3.2 Mounting Configurations and Opti[...]

  • Page 5

    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. Based on the proven technology found in other GARMIN 12 channel GPS receivers, the GPS 35LP will track up to 12 satellites at a time while pr[...]

  • Page 6

    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. 1.3 Naming Conventions The GPS 35LP Series TrackPack™ receiv[...]

  • Page 7

    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: 2.7V threshold 1.4.4 Performance 1) Tracks up to 12 satellites (up to 11 with PPS active) 2) U[...]

  • Page 8

    4 4) One-pulse-per-second timing output 5) Binary Format Phase Data 1.5 APPLICATION Fig. 1, TYPICAL APPLICATION ARCHITECTURE[...]

  • Page 9

    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. 2.1 SELF TEST After input power has been applied to the GPS 35LP and periodically thereafter, the unit will perform critical self test func[...]

  • Page 10

    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. The host system, at its option, may command the GPS 35LP to choose a specific mode of navigation, such as 2D[...]

  • Page 11

    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.[...]

  • Page 12

    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. 3.1.1 GPS 35 Dimensions (General tolerance ± ± 0.50mm) Fig. 2 GPS 35LP Dimensions[...]

  • Page 13

    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. Fig. 3, Magnetic Mount Attachment[...]

  • Page 14

    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[...]

  • Page 15

    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[...]

  • Page 16

    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. Fig. 6, Flange Mount Attachment[...]

  • Page 17

    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. Typical operating current is 120 mA. Transients and overvoltages are [...]

  • Page 18

    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.O. Box 50040, Mobile, AL, 36605, USA) and the Radio Technical Commission for Maritime Services?[...]

  • Page 19

    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. If there are no errors in the sentence, it will be echoed u[...]

  • Page 20

    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. 4.1.4 Additional Sensor Configuration Information (PGRMC1) The $PGRMC1 sentence provides additional information used to configure the sensor board opera[...]

  • Page 21

    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. $PSLIB ,<1>,<2>*hh<CR><LF> &[...]

  • Page 22

    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. Regardless of the selected baud rate, the information transmitted by the GPS 35LP is referenced to the on[...]

  • Page 23

    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. After the initial position fix, the date and time of day are calculated using GPS satellite information and are s[...]

  • Page 24

    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, 0.5 to 99.9 <9> Antenna height above/below mean sea level, -[...]

  • Page 25

    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 GPVTG sentence reports track and velocity information with a checksum: $GPVTG ,<1>,T,<2>,M,<3>,N,<4>,K,<5>*hh<CR>&[...]

  • Page 26

    22 $PGRMF ,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,<10>,<11>,<12>,<13>,<14>,<15>*hh<CR><LF> <1> GPS week number (0 - 1023) <2> GPS seconds (0 - 604799) <3> UTC date of position fix, ddmmyy format <4> UTC time of position fix, hh[...]

  • Page 27

    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. Th[...]

  • Page 28

    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, Senegal, Sudan 1 AFGOOYE - Somalia 2 AIN EL ABD 1970 - Bahrain Island, Saudi Arabia 3 ANNA 1 ASTRO 1965 - Cocos Island 4 ARC 1950 - Botswana, Lesotho, M[...]

  • Page 29

    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 48 LUZON - Phillippines (excluding Mindanao Island) 49 MAHE 1971 - Mahe Island 50 MARCO ASTRO - Salvage Islands 51 MASSA WA - Eritrea (Ethiopia) 52 MER[...]

  • Page 30

    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 Sabah) 94 TOKYO - Japan, Korea, Okinawa 95 TRISTAN ASTRO 1968 - Tristan da Cunha 96 User defined earth datum 97 VITI LEVU 1916 - Viti Levu Island (Fiji I[...]

  • Page 31

    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. To install the e[...]

  • Page 32

    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.EXE can be invoked from a DOS prompt: < path>gps25pm.exe [/com<x>] [/b:&[...]

  • Page 33

    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. The records are sent at a default baud rate of 9600 baud, 8 bits, no parity. Record[...]

  • Page 34

    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 first byte) - 0x29 (receiver record identifier) - 0xE2 (size of data) - cpo _rcv_type (see below) - one byte chksum (the addition of bytes between th[...]

  • Page 35

    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 = 0; rx _state_type rx_state = dat; void add_to_que( char data ) { # define dle_byte 0x10 # define etx_byte 0x03 if ( rx_state == dat) { if (data == dle[...]

  • Page 36

    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.EXE is designed to interface with a Garmin GPS 25 XL or GPS 25LP sensor boards and t[...]

  • Page 37

    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.EXE will create the file ALMANAC.DAT and locate it the current working directory. If an ALMANAC.[...]

  • Page 38

    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) : -7.771752131E-009 SQRT(A) (m^1/2): 5153.589843 Right Ascen at TOA( rad): 8.032501489E-002 Ar[...]

  • Page 39

    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 delimiters should equal 0) - 0x10 ( dle) - 0x03 ( etx) typedef struct /* ephemeris record */ { char svid; /* Satellite number (0 - 31) */ int wn; /* week [...]

  • Page 40

    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 176.5 21135153.13 2069992 RCV 19 47 T 145.2 21190271.83 2182643 RCV 31 45 T 75.8 212403[...]

  • Page 41

    37 GARMIN Corporation 1200 East 151st Street Olathe, KS 66062 (913 )397-8200 (913 )397-8282 FAX 190-00148-00 Rev. E[...]