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Home --> GPS Antenna --> GPS Receiver

GM88-USB



Description


GM88-mini is a GPS Mouse receiver build-in well-known SiRF StarIII GPS chipset. GM88-mini provides customer high position, velocity and time accuracy performances as well as high sensitivity and tracking capabilities. Customers benefit from the strength of both companies.Thanks to the low power consumption technology, the GPS-Mouse receiver is ideal for many portable applications such as PDA, Tablet PC, smart phone etc.

Features
Built-in high performance SiRF Star III low power chipset.
Current consumption 40mA
20 channels parallel.
Average Cold Start in 42 seconds.
-159 dBm sensitivity in tracking mode
NMEA0183 compliant protocol
Extreme fast TTFF at low signal level
Water proof IPX6

Applications
Automotive
Personal/Portable Navigation (PDA)
Geographic Surveying
Sports and Recreation
Marine Navigation
Fleet Management
AVL and Location-Based Services

Specifications

GPS Features Datum
Chipset SiRF Star III LP chipset WGS-84
Frequency L1, 1575.42MHz  
C/A Code 1.023MHz chip rate Dynamic Conditions
Channels  20 channels Altitude <18,000 m (60,000feet)
Antenna Built-in 25x25x4mm patch antenna Velocity <515 m/s (1000 knots)
  Acceleration <4G
Sensitivity Motional Jerk 20m/sec3 max.
To - 159dBm Tracking,  
Superior Urban Canyon Performance Interface
  GPS Protocol: NMEA-0183 - GGA, GSA, GSV, RMC, VTG(Default)
Time to First Fix (TTFF)  
Cold Start 42 sec, average Data bit: 8, stop bit: 1 (Default)
Warm Start 38 sec, average Baud Rate : 9600 (Default)
Hot Start 6 sec, average Device Size and Weight
Reacquisition 0.1 sec 41.0x36.0x15.0 mm
Update rate 1 Hz (std.)    
    Environmental Characteristics
Accuracy Operating Temperature - 10°C to + 80°C
Position 5m CEP without SA, 10m 2D, RMS  Storage Temperature - 30°C to + 85°C
Velocity 0.1m/sec, without SA    
Time 1μs synchronized to GPS time Power
Cable 3M Operation Current 55mA (Average)
Connector USB-Male Power Input 5V ±5% VDC input
Water Proof IPX6

All specifications are subject to change without notice

Pin Assignment of A Type USB connector (figure 2)

Pin Signal
1 +5VDC
2 D-
3 D+
4 GND

Output NMEA Messages

Table 3 NMEA-0183 V2.3 Output Messages
NMEA Sentence Description
GGA (default) Global Positioning System Fixed Data
GLL (default) Geographic Position - Latitude/Longitude
GSA (default) GNSS DOP and Active Satellites
GSV (default) GNSS Satellites in View
RMC (default) Recommended Minimum Specific GNSS data
VTG (default) Course Over Ground and Ground Speed
ZDA (default) Time and Date

GGA--- Global Positioning System Fixed Data
Table 4 contains the values for the following example:
$GPGGA,092725.00,4717.11399,N,00833.91590,E,1,8,1.01,499.6,M,48.0,M,,0*5B

Table 4 GGA Data Format
Name Example Units Description
Message ID $GPGGA   GGA protocol header
UTC Time 092725.00   hhmmss.ss, Current time
Latitude 4717.11399   ddmm.mmmmm, Degrees + minutes
N/S Indicator N   N=north or S=south
Longitude 00833.91590   dddmm.mmmmm, Degrees + minutes
E/W Indicator E   E=east or W=west
Position Fix Indicator 1   See Table 5
Satellites Used 8   Range 0 to 12
HDOP 1.01   Horizontal Dilution of Precision
MSL Altitude 499.6 m  
Units M meters Meters (fixed field)
Geoid Separation 48.0 m  
Units M meters Meters (fixed field)
Age of Differential Corrections   second Blank (Null) fields when DGPS is not used
Diff. Ref. Station ID 0    
Checksum *5B    
<CR> <LF>     End of message termination

Table 5 Position Fix Indicator

Value Description
0 No fix or invalid
1 Standard GPS (2D/3D)
2 Differential GPS
6 Estimated (DR) Fix

GLL---Geographic Position - Latitude/Longitude
Table 6 contains the values for the following example:
$GPGLL,4717.11364,N,00833.91565,E,092321.00,A,A*60

Table 6 GLL Data Format
Name Example Units Description
Message ID $GPGLL   GLL protocol header
Latitude 4717.11364   ddmm.mmmmm, Degrees + minutes
N/S Indicator N   N=north or S=south
Longitude 00833.91565   dddmm.mmmmm, Degrees + minutes
E/W Indicator E   E=east or W=west
UTC Time 092321.00   hhmmss.ss, Current time
Status A   V = Data Invalid / Receiver Warning,
A=Data Valid
Status A   N=No Fix, A=Autonomous GNSS Fix,
D=Differential GNSS Fix,
E=Estimated/Dead Reckoning Fix
Checksum *60    
<CR> <LF>     End of mes End of message termination

GSA---GNSS DOP and Active Satellites
Table 7 contains the values for the following example:
$GPGSA,A,3,23,29,07,08,09,18,26,28,,,,,1.94,1.18,1.54*0D

Table 7 GSA Data Format
Name Example Units Description
Message ID $GPGSA   GSA protocol header
Mode 1 (Smode) A   See Table 8
Mode 2 (Fix Status) 3   See Table 9
Satellite Used 23   SV on Channel 1
Satellite Used 29   SV on Channel 2
      Repeated for each channel
Satellite Used     Sv on Channel 12
PDOP 1.94   Position Dilution of Precision (00.0 to 99.99)
HDOP 1.18   Horizontal Dilution of Precision (00.0 to 99.99)
VDOP 1.54   Vertical Dilution of Precision (00.0 to 99.99)
Checksum *0D    
<CR> <LF>     End of message termination

Table 8 Mode 1 (Smode)

Value Description
M Manual- forced to operate in 2D or 3D mode
A Automatic-allowed to automatically switch 2D/3D

Table 9 Mode 2 (Fix Status)

Value Description
1 Fix not available
2 2D Fix
3 3D Fix

GSV---GNSS Satellites in View
Table 10 contains the values for the following example:
$GPGSV,3,1,10,23,38,230,44,29,71,156,47,07,29,116,41,08,09,081,36*7F
$GPGSV,3,2,10,10,07,189,,05,05,220,,09,34,274,42,18,25,309,44*72
$GPGSV,3,3,10,26,82,187,47,28,43,056,46*77

Table 10 GSV Data Format
Name Example Units Description
Message ID $GPGSV   GSV protocol header
Number of Messages 3   Total number of GPGSV messages being output, Range 1 to 3
Message Number 1   Number of this message, Range 1 to 3
Satellites in View 10    
Satellite ID 23   SV ID (GPS: 1-32, SBAS 33-64 (33=PRN120))
Elevation 38 degree Maximum 90
Azimuth 230 degree Range 0 to 359
SNR (C/No) 44 dBHz Range 0 to 99, null when not tracking
      Data of 2nd, 3rd Satellite (same as above)
Satellite ID 29   SV ID
Elevation 71 degree Maximum 90
Azimuth 156 degree Range 0 to 359
SNR (C/No) 47 dBHz Range 0 to 99, null when not tracking
       
Checksum *7F    
<CR> <LF>     End of message termination

RMC---Recommended Minimum Specific GNSS Data
Table 11 contains the values for the following example:
$GPRMC,083559.00,A,4717.11437,N,00833.91522,E,0.004,77.52,091202,,,A*57

Table 11 RMC Data Format
Name Example Units Description
Message ID $GPRMC   RMC protocol header
UTC Time 083559.00   hhmmss.ss, Current time
Status A   A=data valid or V=data not valid
Latitude 4717.11437   ddmm.mmmmm, Degrees + minutes
N/S Indicator N   N=north or S=south
Longitude 00833.91522   dddmm.mmmmm, Degrees + minutes
E/W Indicator E   E=east or W=west
Speed 0.004 knots Speed Over Ground
COG 77.52 degree Course Over Ground (true)
Date 091202   Ddmmyy, Current Date in Day, Month Year format
Magnetic Variation   degrees E=east or W=west (Not being output by receiver)
Magnetic variation E/W indicator     Not being output by receiver
Mode Indicator A   N=No Fix, A=Autonomous GNSS Fix,
D=Differential GNSS Fix,
E=Estimated/Dead Reckoning Fix
Checksum *53    
<CR> <LF>     End of message termination

VTG---Course Over Ground and Ground Speed
Table 12 contains the values for the following example:
$GPVTG,77.52,T,,M,0.004,N,0.008,K,A*06

Table 12 VTG Data Format
Name Example Units Description
Message ID $GPVTG   VTG protocol header
COG 77.52 degrees Course Over Ground (true)
  T   True
COG   degrees Course Over Ground (maganetic) (Not being output by receiver)
  M   Magnetic
Speed 0.004 knots Speed over ground
Units N   Knots
Speed 0.008 km/hr Speed over ground
Units K   Kilometer per hour
Mode A   N=No Fix, A=Autonomous GNSS Fix, D=Differential GNSS Fix, E=Estimated/Dead Reckoning Fix
Checksum *0B    
<CR> <LF>     End of message termination

ZDA---Time and Date
Table 13 contains the values for the following example:
$GPZDA,082710.00,16,09,2002,00,00*64

Table 13 ZDA Data Format
Name Example Units Description
Message ID $GPZDA   ZDA protocol header
UTC Time 081727.00 degrees hhmmss.ss
Day 16   01 to 31
Month 09   01 to 12
Year 2002   4 digit year
Local zone hours 00   (Not being output by receiver) (fixed to 00)
Local zone minutes 00   (Not being output by receiver) (fixed to 00)
Checksum *64    
<CR> <LF>     End of message termination


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