Holux GR-87 User manual
No.1-1, Innovation Rd.1, HsinChu City 300, Science-based Industrial Park, aiwan
(300) 新竹市科學園區創新一路 1-1 號
EL: 03-6687000 FAX: 03-6687111
Website: www.holux.com
All Right Reserved
GR-87
SPECIFICA ION
GPS Engine Board
GR-87
GPS Module series
HE PRO NAME IN GPS
HOLUX echnology, Inc.
1F, No.30, R&D Road, Hsinchu 300, aiwan (Hsinchu Science Industrial Park)
EL: 886-3-6687000 FAX: 886-3-6687111 E-mail:info@holux.com.tw
Website:www.holux.com.tw
2
1. Main Feature
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 FF and high sensitivity
acquisitions
Integrated ARM7 DMI CPU with software engineering services and
available for embedded customer defined applications.
On chip 1Mb SRAM.
Dual L level serial ports with one for GPS receiver command message
interface, another one for R CM-104 DGPS input.
Compact Board Size 1”x1”x0.27”(25.4x25.4x7mm) for easy integration
into hand-held device.
Reacquisition ime 0.1 seconds
Support Standard NMEA-0183 and SiRF Binary protocol
Support Accurate 1PPS Output Signal Aligned with GPS iming
Multi-path Mitigation Hardware
On-board R CM 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。
GR-87
GPS Module series
HE PRO NAME IN GPS
HOLUX echnology, Inc.
1F, No.30, R&D Road, Hsinchu 300, aiwan (Hsinchu Science Industrial Park)
EL: 886-3-6687000 FAX: 886-3-6687111 E-mail:info@holux.com.tw
Website:www.holux.com.tw
3
4). Altitude：< ± 35m Vertical in term of 95%。
5). Velocity：0.1 meters/second。
6). ime 1 microsecond synchronized to GPS time。
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). wo 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 (V G ,
GR-87
GPS Module series
HE PRO NAME IN GPS
HOLUX echnology, Inc.
1F, No.30, R&D Road, Hsinchu 300, aiwan (Hsinchu Science Industrial Park)
EL: 886-3-6687000 FAX: 886-3-6687111 E-mail:info@holux.com.tw
Website:www.holux.com.tw
4
GLL and ZDA for optional))。
3). DGPS protocol R CM 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). ime 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 ℃。
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 。
GR-87
GPS Module series
HE PRO NAME IN GPS
HOLUX echnology, Inc.
1F, No.30, R&D Road, Hsinchu 300, aiwan (Hsinchu Science Industrial Park)
EL: 886-3-6687000 FAX: 886-3-6687111 E-mail:info@holux.com.tw
Website:www.holux.com.tw
5
3. Mechanical Dimensions
3.1. GR-87-T0A, GR-87-T0C outline:
Picture
Design Layout Diagram: (unit mm)
GR-87
GPS Module series
HE PRO NAME IN GPS
HOLUX echnology, Inc.
1F, No.30, R&D Road, Hsinchu 300, aiwan (Hsinchu Science Industrial Park)
EL: 886-3-6687000 FAX: 886-3-6687111 E-mail:info@holux.com.tw
Website:www.holux.com.tw
6
3.2. GR-87-T0B, GR-87-T0D outline:
Picture
Design Layout Diagram: (unit mm)
GR-87
GPS Module series
HE PRO NAME IN GPS
HOLUX echnology, Inc.
1F, No.30, R&D Road, Hsinchu 300, aiwan (Hsinchu Science Industrial Park)
EL: 886-3-6687000 FAX: 886-3-6687111 E-mail:info@holux.com.tw
Website:www.holux.com.tw
7
3.3. Pin assignment of connector:
able 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.
able 4-1 J1 connector pin definition:
Pin
Pin Name Function description
1 VCC_5V +3.5~5.5VDC power input
2 XA Serial Data output port A(CMOS Level: Voh 2.4V ≧
Vol 0.4V Ioh=Iol=2mA)≦
3 RXA Serial Data input port A(CMOS Level Vih≧0.7*VCC
Vil≦0.3*VCC)
4 RXB Serial Data input port B(CMOS Level Vih≧0.7*VCC
Vil≦0.3*VCC)
5 GND Power ground
6 IMEMARK/
RESE (option)
IMEMARK: 1PPS ime mark output(Vil≦0.2V Pulse
Width 1 usec)。
RESE : Reset Input (Active Low)(option function)
3.3.1 VCC_5V
his is the main DC power supply for a +3.3~ 5.5 V engine board。
3.3.2 TXA
his is the main transmitting channel and is used to output navigation and
measurement data for user written software。
3.3.3 RXA
his is the main receiving channel and is used to receive software commands
to the board from user written software。
3.3.4 RXB
his 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。
GR-87
GPS Module series
HE PRO NAME IN GPS
HOLUX echnology, Inc.
1F, No.30, R&D Road, Hsinchu 300, aiwan (Hsinchu Science Industrial Park)
EL: 886-3-6687000 FAX: 886-3-6687111 E-mail:info@holux.com.tw
Website:www.holux.com.tw
8
3.3.6 TIMEMARK default)/ RESET option)
his 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. he output
is a CMOS 3V positive level signal. Only upon a situation of tracking or
navigating will output once per second. his is not available in rickle-Power
mode。
he 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. ( his second function setting need contact factory)。
4. Ordering Information
Model No.
Output Level
CMOS 3V or
RS-232)
RF interface
output v
oltage
V)
Back-up battery
Rechargeable
Lithium)
Power
Saving
RF Connector
Type
GR-87-T0A CMOS 3V 2.8 Y Y MMCX 180∘
∘∘
∘)
GR-87-T0B CMOS 3V 2.8 Y Y MMCX 90∘
∘∘
∘)
GR-87-T0C CMOS 3V VCC_IN Y Y MMCX 180∘
∘∘
∘)
GR-87-T0D CMOS 3V VCC_IN Y Y MMCX 90∘
∘∘
∘)
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