Holux GR-87 User Manual

GPS Engine Board

GR-87
SPECIFICATION

No.1-1, Innovation Rd.1, HsinChu City 300, Science-based Industrial Park, Taiwan

(300) 新竹市科學園區創新一路 1-1 號

TEL: [phone] FAX: [phone]

Website: www.holux.com

All Right Reserved

GR-87

GPS Module series

1. Main Feature

THE PRO NAME IN GPS

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Build on high performance SiRF StarIII chipset.

Average Cold Start time and under 45 seconds.

Low power consumption

20 channels “All-in-View” tracking.

200,000+ effective correlators for fast TTFF and high sensitivity

acquisitions

Integrated ARM7TDMI CPU with software engineering services and

available for embedded customer defined applications.

On chip 1Mb SRAM.

Dual TTL level serial ports with one for GPS receiver command message

interface, another one for RTCM-104 DGPS input.

Compact Board Size 1”x1”x0.27”(25.4x25.4x7mm) for easy integration

into hand-held device.

Reacquisition Time 0.1 seconds

Support Standard NMEA-0183 and SiRF Binary protocol

Support Accurate 1PPS Output Signal Aligned with GPS Timing

Multi-path Mitigation Hardware

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On-board RTCM SC-104 DGPS and WAAS /EGNOS Demodulator

Built-in a lithium battery make GPS fast positioning

2. Technical Specifications

2.1. Electrical Characteristics

2.1.1 General

1). Frequency：L1, 1575.42 MHz。

2). C/A code：1.023 MHz chip rate。

3). Channels：20。

2.1.2 Accuracy (Open Sky)

1). Position：10 meters, 2D RMS。

2). 7 meters 2D RMS, WAAS corrected。

3). 1-5 meters, DGPS corrected。

HOLUX Technology, Inc.
1F, No.30, R&D Road, Hsinchu 300, Taiwan (Hsinchu Science Industrial Park)
TEL: [phone] FAX: [phone] E-mail:[e-mail]
Website:www.holux.com.tw

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GR-87

GPS Module series

4). Altitude：< ± 35m Vertical in term of 95%。

5). Velocity：0.1 meters/second。

6). Time 1 microsecond synchronized to GPS time。

THE PRO NAME IN GPS

2.1.3 Datum

1). Default：WGS-84。

2). Other Support different datum by request。

2.1.4 Acquisition Rate (Open sky, stationary requirements)

1). Reacquisition：0.1 sec., average。

2). Snap start：2 sec., average。

3). Hot start：8 sec., average。

4). Warm start：38 sec., average。

5). Cold start：42 sec., average。

2.1.5 Dynamic Conditions

1). Altitude : 18,000 meters (60,000 feet) max。

2). Velocity : 515 meters/second (1000 knots) max。

3). Acceleration : 4g, max。

4). Jerk : 20 meters/second, max。

2.1.6 Power

1). Input power : 3.3 ~ 5.5 VDC input。

2). Input current: Less than 80 mA (without antenna) 。

3). Backup power: 3V Rechargeable Lithium cell battery, up to 500 hours

discharge。

2.1.7 RF interface

1). Antenna connector type: MMCX, output 2.8~3 VDC. (optional output

VCC_IN)

2). Minimum signal tracking: -159 dBm。

2.1.8 Serial Port

1). Two full duplex serial communication, CMOS interface, with user

selectable baud rate (4800-Default, 9600, 19200, 38400)。

2). NMEA 0183 Version 2.2 ASCII output (GGA, GSA, GSV, RMC (VTG ,

HOLUX Technology, Inc.
1F, No.30, R&D Road, Hsinchu 300, Taiwan (Hsinchu Science Industrial Park)
TEL: [phone] FAX: [phone] E-mail:[e-mail]
Website:www.holux.com.tw

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