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

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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。

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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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GR-87

GPS Module series

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。

2.1.9 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, ±1 microsecond。

2.2. Environmental Characteristics

1). Operating temperature range -10 ℃ to +60 ℃。

2). Storage temperature range -20 ℃ to +85 ℃。

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2.3. Physical Characteristics

1) Active Size: 25.4(W) x 25.4(D) x 7(H) (mm) 。

2) Weight: 2 g。

3) Interface connector 6-pin straight male header, 1.25 mm pitch 。

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

3. Mechanical Dimensions

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3.1. GR-87-T0A, GR-87-T0C outline:

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Picture

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Design Layout Diagram: (unit mm)

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

3.2. GR-87-T0B, GR-87-T0D outline:

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Picture

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Design Layout Diagram: (unit mm)

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

6

GR-87

GPS Module series

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3.3. Pin assignment of connector:

Table 4-1 is pin list of the 6-Pin Interface Connector. Connector is Male header

1.25mm pitch DIP R/A type. Actual pin size see appendix B.

Table 4-1 J1 connector pin definition:

Pin

Pin Name Function description

1 VCC_5V +3.5~5.5VDC power input

Serial Data output port A(CMOS Level: Voh 2.4V ≧

2 TXA

Vol 0.4V Ioh=Iol=2mA)≦

Serial Data input port A(CMOS Level Vih≧0.7*VCC

3 RXA

Vil≦0.3*VCC)

Serial Data input port B(CMOS Level Vih≧0.7*VCC

4 RXB

Vil≦0.3*VCC)

5 GND Power ground

TIMEMARK: 1PPS Time mark output(Vil≦0.2V Pulse

TIMEMARK/

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Width 1 usec)。

RESET (option)

RESET: Reset Input (Active Low)(option function)

3.3.1 VCC_5V

This is the main DC power supply for a +3.3~ 5.5 V engine board。

3.3.2 TXA

This is the main transmitting channel and is used to output navigation and
measurement data for user written software。

3.3.3 RXA

This is the main receiving channel and is used to receive software commands
to the board from user written software。

3.3.4 RXB

This is the auxiliary receiving channel and is used to input differential
corrections to the board to enable DGPS navigation。

3.3.5 GND

GND provides the ground for the board. Connect all grounds。

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

7

GR-87

CMOS 3V or

oltage

GPS Module series

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3.3.6 TIMEMARK (default)/ RESET (option)

This pin default is provides 1 pulse per second output from the GR-87 engine

board, which is synchronized to within 1 microsecond of GPS time. The output

is a CMOS 3V positive level signal. Only upon a situation of tracking or

navigating will output once per second. This is not available in Trickle-Power
mode。

The secondary option function is provides an active-low reset input to the

engine board. It causes the engine board to reset and start searching for
satellites. (This second function setting need contact factory)。

4. Ordering Information

Output Level

Model No.

GR-87-T0A CMOS 3V 2.8 Y Y

GR-87-T0B CMOS 3V 2.8 Y Y

GR-87-T0C CMOS 3V VCC_IN Y Y

GR-87-T0D CMOS 3V VCC_IN Y Y

(

RS-232)

RF interface

output v

(V)

Back-up battery

Power

(Rechargeable

Saving

Lithium)

RF Connector

Type

MMCX(180∘∘∘∘)

MMCX(90∘∘∘∘)

MMCX(180∘∘∘∘)

MMCX(90∘∘∘∘)

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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