Holux GR-87 User manual

GPS
Productseries With HOLUX, You never lose the way!
HOLUX Technology, Inc.
1F, No.30, R&D Road, Hsinchu 300, Taiwan (Hsinchu Science Industrial Park)
TEL: [phone] FAX:[phone] E-mail:[email protected]om.tw Website:www.holux.com.tw
1
GR-87 GPS Receiver Module
1. Main Feature
zBuild on high performance SiRF StarIII chipset.
zAverage Cold Start time and under 45 seconds.
zLow power consumption
z20 channels “All-in-View” tracking.
z200,000+ effective correlators for fast TTFF and high sensitivity
acquisitions
zIntegrated ARM7TDMI CPU with software engineering services and
available for embedded customer defined applications.
zOn chip 1Mb SRAM.
zDual TTL level serial ports with one for GPS receiver command message
interface, another one for RTCM-104 DGPS input.
zCompact Board Size 1”x1”x0.27”(25.4x25.4x7mm) for easy integration
into hand-held device.
zReacquisition Time 0.1 seconds
zSupport Standard NMEA-0183 and SiRF Binary protocol
zSupport Accurate 1PPS Output Signal Aligned with GPS Timing
zMulti-path Mitigation Hardware
zOn-board RTCM SC-104 DGPS and WAAS /EGNOS Demodulator
zBuilt-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.

GPS
Productseries With HOLUX, You never lose the way!
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
2
4). Altitude ：< ± 35m Vertical in term of 95%.
5). Velocity：0.1 meters/second.
6). Time 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). Hot start：1 sec., average.
3). Warm start：38 sec., average.
4). 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 input：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 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 ,
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.

GPS
Productseries With HOLUX, You never lose the way!
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
3
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 ℃.
.
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 .
3. Mechanical Dimensions
3.1 . GR-87-T0A, GR-87-T0C outline:
zPicture
zDesign Layout Diagram: (unit mm)
Pin 1
J1 Connector
MMCX Active Ant connector

GPS
Productseries With HOLUX, You never lose the way!
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
4
3.2 . GR-87-T0B, GR-87-T0D outline:
zPicture
zDesign Layout Diagram: (unit mm)
J1 Connector
MMCX Active Ant connector
Pin 1

GPS
Productseries With HOLUX, You never lose the way!
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
5
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
2 TXA
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 TIMEMARK/
RESET (option)
TIMEMARK: 1PPS Time mark output(Vil≦0.2V Pulse
Width 1 usec).
RESET: Reset Input (Active Low)(option function)

GPS
Productseries With HOLUX, You never lose the way!
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
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.
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
Model No.
Output Level
(CMOS 3V or
RS-232)
RF interface
output voltage (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∘)