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Garmin GPS 35 LP Technical Specification

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

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  • Page 1 GPS 35 LP TracPak GPS SMART ANTENNA TECHNICAL SPECIFICATION Models: GPS35-LVC GPS35-LVS GPS35-HVS ____________________________________________________________ 66062 · (913) 397-8200 · (913) 397-8282 FAX GARMIN · 1200 E. 151st Street · Olathe, Kansas...
  • Page 2 GARMIN. Information in this document is subject to change without notice. GARMIN reserves the right to change or improve their products and to make changes in the content without obligation to notify any person or organization of such changes or improvements.
  • Page 3 · Consult the dealer or an experienced radio/TV technician for help. This device contains no user-serviceable parts. Repairs should only be performed by an authorized GARMIN service center. Unauthorized repairs or modifications to this device could void your warranty and your authority to operate this device under Part 15 regulations.

  • Page 4: Table Of Contents

    Introduction Overview Features Naming Conventions Technical Specifications Application Operational Characteristics Self Test Initialization Navigation Satellite Data Collection Hardware Interface Mechanical Dimensions Mounting Configurations and Options Connection Wiring Description Software Interface NMEA Received Sentences NMEA Transmitted Sentences Baud Rate Selection One-Pulse-Per-Second Output RTCM Received Data Earth Datums GPS 35LP Evaluation Kits...

  • Page 5: Introduction

    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 providing fast time-to-first-fix, one second navigation updates and low power consumption.

  • Page 6: Naming Conventions

    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™...
  • Page 7 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)

  • Page 8: Application

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

  • Page 9: 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 functions and report the results over the output channel(s).

  • Page 10: Satellite Data Collection

    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 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: Hardware Interface

    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: Mounting Configurations And Options

    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 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 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 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: Connection Wiring Description

    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.

  • Page 18: Software Interface

    19087, Washington, DC, 20036, USA). The GPS 35LP interface protocol, in addition to transmitting navigation information as defined by NMEA 0183, transmits additional information using the convention of GARMIN proprietary sentences. The following sections describe the data format of each sentence transmitted and received by the GPS 35LP sensor.
  • Page 19 4.1.2 Sensor Initialization Information (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 upon receipt. If an error is detected, the echoed PGRMI sentence will contain the current default values.
  • Page 20 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 operation.
  • Page 21 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> <1> Beacon tune frequency, 0.0, 283.5 – 325.0 kHz in 0.5 kHz steps <2>...

  • Page 22: Nmea Transmitted Sentences

    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 one-pulse-per-second output pulse immediately preceding the GPRMC sentence.
  • Page 23 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 synchronized with the one-pulse-per-second output.
  • Page 24 <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>...
  • Page 25 Mode indicator (only output if NMEA 2.30 active), A = Autonomous, D = Differential, E = Estimated, N = Data not valid 4.2.11 Estimated Error Information (PGRME) The GARMIN Proprietary sentence $PGRME reports estimated position error information. $PGRME,<1>,M,<2>,M,<3>,M*hh<CR><LF> <1> Estimated horizontal position error (HPE), 0.0 to 999.9 meters <2>...
  • Page 26 Time dilution of precision, 0 to 9 (rounded to nearest integer value) 4.2.13 Sensor Status Information (PGRMT) The GARMIN Proprietary sentence $PGRMT gives information concerning the status of the sensor board. This sentence is transmitted once per minute regardless of the selected baud rate. $PGRMT,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>*hh<CR><LF>...

  • Page 27: Baud Rate Selection

    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.

  • Page 28: 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): ADINDAN - Ethiopia, Mali, Senegal, Sudan AFGOOYE - Somalia AIN EL ABD 1970 - Bahrain Island, Saudi Arabia...
  • Page 29 KANDAWALA - Sri Lanka KERGUELEN ISLAND - Kerguelen Island KERTAU 1948 - West Malaysia, Singapore L.C. 5 ASTRO - Cayman Brac Island LIBERIA 1964 - Liberia LUZON - Mindanao Island LUZON - Phillippines (excluding Mindanao Island) MAHE 1971 - Mahe Island MARCO ASTRO - Salvage Islands MASSAWA - Eritrea (Ethiopia) MERCHICH - Morocco...
  • Page 30 SOUTHEAST BASE - Porto Santo and Madeira Islands SOUTHWEST BASE - Faial, Graciosa, Pico, Sao Jorge, and Terceira Islands (Azores) TIMBALAI 1948 - Brunei and East Malaysia (Sarawak and Sabah) TOKYO - Japan, Korea, Okinawa TRISTAN ASTRO 1968 - Tristan da Cunha User defined earth datum VITI LEVU 1916 - Viti Levu Island (Fiji Islands) WAKE-ENIWETOK 1960 - Marshall Islands...

  • Page 31: Gps 35Lp Evaluation Kits

    Windows. NMEAVWR.EXE The NMEAVWR.EXE program in the GARMIN program group can accept NMEA data from either the com1 or com2 PC serial port at 1200, 2400, 4800, 9600 or 19200 baud. The default settings are com1 at 4800 baud. NMEAVWR receives NMEA sentences and displays sentence information in a formatted display on the screen.
  • Page 32 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:<yyyy>]...

  • Page 33: Phase Data Output

    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. Records begin with a delimiter byte (10 hex).
  • Page 34 Latitude (rad) Longitude (rad) lon_vel Longitude velocity (mt/sec) lat_vel Latitude velocity (mt/sec) alt_vel Altitude velocity (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 the delimiters should equal 0) - 0x10 (dle)
  • Page 35 dle and etx bytes: Software written to receive the two records should filter dle and etx bytes as described below: typedef enum dat, dle, } rx_state_type; char in_que[256]; in_que_ptr = 0; rx_state_type rx_state = dat; void add_to_que( char data ) #define dle_byte 0x10 #define...
  • Page 36 - 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 the GPS 35LP sensors. The program will perform the following functions: - display and log phase data output by GPS sensors.
  • Page 37 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.
  • Page 38 File Formats ALMANAC.DAT Example almanac entry: **** Week 794 almanac for PRN-01 ************ Health: Eccentricity: Time of Applicability(s): Orbital Inclination(rad): Rate of Right Ascen(r/s): SQRT(A) (m^1/2): Right Ascen at TOA(rad): Argument of Perigee(rad): Mean Anom(rad): Af0(s): Af1(s/s): week: Almanac information for satellites with a bad health status will not be included in this file when downloaded from the GPS25 sensor and should not be included when uploading to the GPS25 sensor.
  • Page 39 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...
  • Page 40 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 RCV 29 50 T 133.2 20364313.25 RCV 28 45 T 176.5 21135153.13 RCV 19 47 T 145.2 21190271.83...
  • Page 41 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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Gps35-lvcGps35-lvsGps35-hvs

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