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 |
|
