Holux GR-89 User Manual

GPS

Product series

With HOLUX, You never lose the way!

GR-89

GPS Engine Board

User’s Guide

June 22, 2006

Version A

Holux Technology Inc.

1F, No. 30, R&D Rd. II, Hsinchu City 300, Science-based Industrial Park, Taiwan.

Phone: [phone] Fax: [phone]

E-Mail: [e-mail] Web: www.holux.com.tw

All Right Reserved

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

1

GPS

Product series

With HOLUX, You never lose the way!

TABLE OF CONTENTS

1. Introduction ..................................................................................................3

2. Main Feature................................................................................................4

3. Technical Specifications ...............................................................................5

3.1. Electrical Characteristics....................................................................5

3.2. Environmental Characteristics ...........................................................6

3.3. Physical Characteristics.....................................................................6

4. Software Interface........................................................................................7

4.1 NMEA Transmitted Messages.............................................................7

4.2 Manufacture Default .........................................................................13

5. Mechanical Dimensions .............................................................................14

5.1 . GR-89 outline:.................................................................................14

5.2 . Pin assignment: ..............................................................................16

6. Operation and Test.....................................................................................18

Appendix A : Reference Design.....................................................................21

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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GPS

Product series

With HOLUX, You never lose the way!

1. Introduction

The GR-89 series consists of SiRF GSC3f chipsets technology, LNA and

proprietary software. The system function block is described as follows.

HOLUX GR-89 is a high performance, low power consumption, small size,
very easy integrated GPS engine board designed for a broad spectrum of
OEM system applications. This product is based on the proven technology
found in other HOLUX 20 channel GPS receivers and SiRF GSC3f chipset
solution. The GPS engine board will track up to 12 satellites at a time while
providing fast time-to-first-fix and one-second navigation updates. Its far
reaching capability meets the sensitivity requirements of car navigation as well
as other location-based applications. Therefore, HOLUX GR-89 engine board
is very fit to the customers who devote themselves to AVL system integration
and location-based service.

The GR-89 design utilizes the latest surface mount technology (BGA) and
high level circuit integration to achieve superior performance while minimizing
space and power requirements. This hardware capability combined with
software intelligence makes the board easy to be integrated and used in all
kinds of navigation applications or products. The application system may
communicate with the engine board set via two RS232 compatible
bi-directional communication channels with CMOS 3V voltage level.

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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GPS

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With HOLUX, You never lose the way!

2. Main Feature

z Build on high performance SiRF GSC3f chipset.
z Average Cold Start time and under 42 seconds.
z Low power consumption

z 20 channels “All-in-View” tracking.

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

acquisitions
z Integrated ARM7TDMI CPU with software engineering services and

available for embedded customer defined applications.

z On chip 1Mb SRAM.
z Dual CMOS 3V serial ports with one for GPS receiver command message

interface.
z Compact Board Size 25.4x25.4x3 mm for easy integration into hand-held

device.

z Reacquisition Time 0.1 seconds
z Support Standard NMEA-0183 and SiRF Binary protocol
z Support Accurate 1PPS Output Signal Aligned with GPS Timing

z Multi-path Mitigation Hardware

z On-board WAAS/EGNOS Demodulator

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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GPS

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3. Technical Specifications

3.1. Electrical Characteristics

3.1.1 General

1). Frequency：L1, 1575.42 MHz

2). C/A code：1.023 MHz chip rate

3). Channels：20

3.1.2 Accuracy

1). Position：10 meters, 2D RMS

2). 7 meters 2D RMS, WAAS corrected

3). 1-5 meters, DGPS corrected

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

5). Velocity：0.1 meters/second

※

(Open Sky)

6). Time 1 microsecond synchronized to GPS time

3.1.3 Datum

1). Default：WGS-84

2). Other Support different datum by request

3.1.4 Acquisition Rate (Open sky, stationary requirements)

1). Hot start：1 sec., average

2). Warm start：38 sec., average

3). Cold start：42 sec., average

3.1.5 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

3.1.6 Power

1). Input power：3.3~5.5 VDC

2). Input current: Less than 65 mA (without antenna)

3.1.7 RF interface

1). RF signal input to RFIN pin from external antenna. DC supply from

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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VCC_ANT_IN (pin 19). If 2.85 V is used, VC_ANT_IN can be
connected with VCC_RF_O (pin 20).

2). Minimum signal tracked: -159 dBm※.

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3.1.8 Serial Port

1). Two full duplex serial communication, CMOS 3V interface, with user
selectable baud rate (4800-Default, 9600, 19200, 38400)

2). NMEA 0183 Version 2.2 ASCII output (GGA, GSA, GSV, RMC (VTG ,
GLL and ZDA for optional))

3). SiRF binary-position, velocity, altitude, status output

3.1.9 TIMEMARK-1PPS Pulse

1). Level CMOS 3V

2). Pulse duration 1 microsecond

3). Time reference At the pulse positive edge

4). Measurements aligned to GPS second,

3.2. Environmental Characteristics

1). Operating temperature range -20 ℃ to +70 ℃

2). Storage temperature range -40 ℃ to +85 ℃

.

3.3. Physical Characteristics

1) Active Size: 25.4(W) x 25.4(D) x 3(H) (mm)

2) Weight: 3 g

※: According to SiRF GSC3 specification.

±1 microsecond

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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GPS

Product series

With HOLUX, You never lose the way!

4. Software Interface

The GR-89 interface protocol is based on the National Marine Electronics
Association's NMEA 0183 ASCII interface specification, which is defined in
NMEA 0183, Version 2.2.

As soon as the initial self-test is complete, the GR-89 begins the process
of satellite acquisition and tracking automatically. Under normal circumstances,
it takes approximately 42 seconds to achieve a position fix, 38 seconds if
ephemeris data is known. After a position fix has been calculated, information
about valid position, velocity and time is transmitted over the output channel.

The GR-89 utilizes initial data, such as last stored position, date, time and
satellite orbital data, to achieve maximum acquisition performance. If
significant inaccuracy exists in the initial data, or the orbital data is obsolete, it
may take more time to achieve a navigation solution. The GR-89 Auto-locate
feature is capable of automatically determining a navigation solution without
intervention from the host system. However, acquisition performance can be
improved as the host system initializes the GR-89 in the following situation:

z Moving further than 500 kilometers.
z Failure of Data storage due to the inactive internal memory battery.

4.1 NMEA Transmitted Messages

The default communication parameters for NMEA output are 4800 baud, 8

data bits, stop bit, and no parity.

Table 4-1 NMEA-0183 Output Messages

NMEA Record

GPGGA Global positioning system fixed data

Description

GPGLL Geographic position- latitude/longitude
GPGSA GNSS DOP and active satellites

GPGSV GNSS satellites in view

GPRMC Recommended minimum specific GNSS data

GPVTG Course over ground and ground speed

GPMSS Radio-beacon Signal-to-noise ratio, signal strength,

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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