Holux GR-90 User Manual

GPS

Product series

With HOLUX, You never lose the way!

GR-90

GPS Engine Board

User’s Guide

October 01, 2006

V ersion 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 .hol ux.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 S pecifications...............................................................................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 RTCM Received Data....................................................................................13

4.3 Manufacturing Default:..................................................................................14

5. Mechanical Dimensions.............................................................................15

5.1 GR-90 outline: ...............................................................................................15

5.2 Pin Assignment:.............................................................................................17

6. Operation and Test.....................................................................................19

Appendix A : Reference Design.....................................................................22

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!

1. Introduction

The GR-90 series consists of SiRF GSC2x chipsets technology, LNA and

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

GPS Antenna

CMOS 3

V signal

RX

TX

GSC 2 x filter LNA

HOLUX GR-90 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 12 channel GPS receivers and SiRF GSC2x 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. It’s far reaching capability
meets the sensitivity requirements of car navigation as well as other
location-based applications. Therefore, HOLUX GR-90 engine board is very fit
to the customers who devote themselves to AVL system integration and
location-based service.

The GR-90 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 RS-232 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

Product series

With HOLUX, You never lose the way!

2. Main Feature

z Build on high performance SiRF GSC2x chipset.

※1

z Average Cold Start time and under 48 seconds.
z Low power consumption

※2

z 12 channels “All-in-View” tracking.

z High speed signal acquisition using 1920 time/frequency search channels

2

z Integrated ARM7TDMI CPU with software engineering services and

available for embedded customer defined applications.

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

interface, another one for RTCM-104 DGPS input.
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 RTCM SC-104 DGPS and 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

Product series

With HOLUX, You never lose the way!

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：12 ※2

3.1.2 Accuracy (Open Sky)

1). Position：<10 meters, 2D RMS

2). < 5 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

※2

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). Reacquisition：0.1 sec., average

2). Hot start：8 sec., average

3). Warm start：38 sec., average

4). Cold start：48 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

※2

※1

3.1.6 Power

1). Input power：3.3~5.5 VDC

2). Input current: Less than 40mA (without antenna)

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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3.1.7 RF interface

1). Minimum signal tracked: -142 dBm. (Based on SiRF GSC2x spec.)

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). DGPS protocol RTCM SC-104 message types 1, 2 and 9

4). 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

※2

4). Measurements Aligned to GPS second,

3.2. Environmental Characteristics

1). Operating temperature range -25 ℃ to +80 ℃

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

±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-90 interface protocol is based on the National Marine Electronics
Association's NMEA 0183 ASC interface specification, which is defined in Ⅱ
NMEA 0183, Version 2.2 and the Radio Technical Commission for Maritime
Services (RTCM Recommended Standards For Differential Navstar GPS
Service, Version 2.1, RTCM Special Committee No.104).

As soon as the initial self-test is complete, the GR-90 begins the process of
satellite acquisition and tracking automatically. Under normal circumstances, it
takes approximately 48 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-90 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-90 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-90 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

Description

GPGGA Global positioning system fixed data

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

GPRMC Recommended minimum specific GNSS data

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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