1. Features
‧ Builds Skytraq Venus 6 high performance and low power consumption GPS Chipset.
‧ 65 parallel satellite-tracking channels for fast acquisition and reacquisition.
‧ Built in high gain LNA.
‧ Extremely fast Time-To-First-Fix(TTFF) at low signal level.
‧ Support NMEA 0183 v3.01 data protocol.
‧ For Car Navigation,Marine Navigation,Fleet Management,AVL and Location-Based Services,Auto Pilot,Personal Navigation or touring devices,Tracking devices/systems and mapping devices application.
2. Technical Specifications
(1) Receiver Type
‧ L1 frequency
‧ GPS C/A code
‧ 65-channel architecture
(2) Sensitivity
‧ -160dBm Acquisition
‧ -165dBm tracking
(3) Open sky Acquisition time
‧ 38 second cold start TTFF
‧ 1 second hot start
(4) Position accuracy
‧ Position 5m CEP without SA
‧ Velocity 0.1m/sec
‧ Timing 60ns
(5) Operational Limits
‧ Altitude <18,000meters (60,000 feet )
‧ Velocity < 515m/s
‧ Acceleration: 4 G, max
(6) Physical Characteristics
‧ Dimension: 53 * 53 * 15 mm
(7) Environmental Characteristics
‧ Operating temperature:
-40 to + 85
‧ Storage temperature:
-45 to +100
‧ Operating humidity:
5% to 90% No condensing.
‧ Power consumption
< 70mW at 3.0 - 5.5V input
(8) Protocol
‧ Datum: Default WGS-84
‧ NMEA output protocol: V.3.01
‧ Baud rate: 9600 bps
‧ Update Rate: 1 Hz
‧ Format: default GGA, GSA, GSV, RMC, VTG
3. Physical Dimension
| IO Interface | Voltage level |
| 4 pin 2.5/3.5mmEarphone Jack | UART(TTL level) |
| CN1 Pin | Pin define | Level |
| 1 | VCC | 3.0—5V Dc |
| 2 | RXD | TTL input/ RS232 |
| 3 | TXD | TTL output/ RS232 |
| 4 | GND | Ground |
| Pin | Description | Internal wire color |
| 1 | NC | |
| 2 | GND | Ground |
| 3 | RXD | TTL input/ RS232 |
| 4 | TXD | TTL output/ RS232 |
| 5 | VDD | 3.0—5V Dc |
| 6 | NC | |
| Pin | Pin define | Level |
| 1 | VCC | 3.0—5V Dc |
| 2 | TXD | TTL input/ RS232 |
| 3 | RXD | TTL output/ RS232 |
| 4 | GND | Ground |
| 5 | GND | Ground |
4. Software Interface
The output data in NMEA-0183 format as defined by the National Marine Electronics Association (NMEA), Version 3.01 Standard.
The default communication parameters for NMEA output are 9600 baud, 8 data bits, stop bit, and no parity.
Table 4-1 NMEA-0183 Output Messages
| NMEA Record | Description |
| GPGGA | Global positioning system fixed data |
| GPGLL | Geographic position- latitude/longitude |
| GPGSA | GNSS DOP and active satellites |
| GPGSV | GNSS satellites in view |
| GPRMC | Recommended minimum specific GNSS data |
| GPVTG | Course over ground and ground speed |
NMEA Message
The full descriptions of supported NMEA messages are provided at the following paragraphs.
GGA - Global Positioning System Fix Data
Time, position and fix related data for a GPS receiver.
Structure:
$GPGGA,hhmmss.sss,ddmm.mmmmm,a,dddmm.mmmmm,a,x,xx,x.x,x.xx,M,x.xx,M,,xxxx*hh<CR><LF>
1 2 3 4 5 6 7 8 9 10 11 12
Example:
$GPGGA,212742.954,2448.13492,N,12058.16712,E,1,09,1.0,19.31,M,19.40,M,,0000*60<CR><LF>
| Field | Name | Example | Description |
| 1 | UTC Time | 212742.954 | UTC of position in hhmmss.sss format, (000000.000 ~ 235959.999) |
| 2 | Latitude | 2448.13492 | Latitude in ddmm.mmmmm format Leading zeros transmitted |
| 3 | N/S Indicator | N | Latitude hemisphere indicator, ‘N’ = North, ‘S’ = South |
| 4 | Longitude | 12058.16712 | Longitude in dddmm.mmmmm format Leading zeros transmitted |
| 5 | E/W Indicator | E | Longitude hemisphere indicator, 'E' = East, 'W' = West |
| 6 | GPS quality indicator | 1 | GPS quality indicator 0: position fix unavailable 1: valid position fix, SPS mode 2: valid position fix, differential GPS mode 3: GPS PPS Mode, fix valid 4: Real Time Kinematic. System used in RTK mode with fixed integers 5: Float RTK. Satellite system used in RTK mode. Floating integers 6: Estimated (dead reckoning) Mode 7: Manual Input Mode 8: Simulator Mode |
| 7 | Satellites Used | 09 | Number of satellites in use, (00 ~ 12) |
| 8 | HDOP | 1.0 | Horizontal dilution of precision, (00.0 ~ 99.9) |
| 9 | Altitude | 19.31 | mean sea level (geoid), (-9999.99 ~ 17999.99) |
| 10 | Geodal Separation | 19.40 | Geoidal separation (-9999.99 ~ 17999.99) |
| 11 | DGPS Station ID | 0000 | Differential reference station ID, 0000 ~ 1023 NULL when DGPS not used |
| 12 | Checksum | 60 | |
GLL – Latitude/Longitude
Latitude and longitude of current position, time, and status.
Structure:
$GPGLL,ddmm.mmmmm,a,dddmm.mmmmm,a,hhmmss.sss,A,a*hh<CR><LF>
1 2 3 4 5 6 7 8
Example:
$GPGLL,2447.96928,N,12059.63137,E,211903.945,A,A*5F<CR><LF>
| Field | Name | Example | Description |
| 1 | Latitude | 2447.96928 | Latitude in ddmm.mmmmm format Leading zeros transmitted |
| 2 | N/S Indicator | N | Latitude hemisphere indicator ‘N’ = North ‘S’ = South |
| 3 | Longitude | 12059.63137 | Longitude in dddmm.mmmmm format Leading zeros transmitted |
| 4 | E/W Indicator | E | Longitude hemisphere indicator 'E' = East 'W' = West |
| 5 | UTC Time | 211903.945 | UTC time in hhmmss.sss format (000000.000 ~ 235959.999) |
| 6 | Status | A | Status, ‘A’ = Data valid, ‘V’ = Data not valid |
| 7 | Mode Indicator | A | Mode indicator ‘N’ = Data not valid ‘A’ = Autonomous mode ‘D’ = Differential mode ‘E’ = Estimated (dead reckoning) mode ‘M’ = Manual input mode ‘S’ = Simulator mode 8 Checksum 09 Number of satellites in use, (00 ~ 12) |
| 8 | Checksum | 09 | Number of satellites in use, (00 ~ 12) |
GSA – GNSS DOP and Active Satellites
GPS receiver operating mode, satellites used in the navigation solution reported by the GGA or GNS sentence and DOP values.
Structure:
$GPGSA,A,x,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,x.x,x.x,x.x*hh<CR><LF>
1 2 3 3 3 3 3 3 3 3 3 3 3 3 4 5 6 7
Example:
$GPGSA,A,3,05,12,21,22,30,09,18,06,14,01,31,,1.2,0.8,0.9*36<CR><LF>
| Field | Name | Example | Description |
| 1 | Mode | A | Mode ‘M’ = Manual, forced to operate in 2D or 3D mode ‘A’ = Automatic, allowed to automatically switch 2D/3D |
| 2 | Mode | 3 | Fix type 1 = Fix not available 2 = 2D 3 = 3D |
| 3 | Satellite used 1~12 | 05,12,21,22,30,09,18,06,14,01,31,, | Satellite ID number, 01 to 32, of satellite used in solution, up to 12 transmitted |
| 4 | PDOP | 1.2 | Satellite ID number, 01 to 32, of satellite used in solution, up to 12 transmitted |
| 5 | HDOP | 0.8 | Horizontal dilution of precision (00.0 to 99.9) |
| 6 | VDOP | 0.9 | Vertical dilution of precision (00.0 to 99.9) |
| 7 | Checksum | 36 | |
GSV – GNSS Satellites in View
Number of satellites (SV) in view, satellite ID numbers, elevation, azimuth, and SNR value. Four satellites maximum per transmission.
Structure:
$GPGSV,x,x,xx,xx,xx,xxx,xx,…,xx,xx,xxx,xx *hh<CR><LF>
1 2 3 4 5 6 7 4 5 6 7 8
Example:
$GPGSV,3,1,12,05,54,069,45,12,44,061,44,21,07,184,46,22,78,289,47*72<CR><LF>
$GPGSV,3,2,12,30,65,118,45,09,12,047,37,18,62,157,47,06,08,144,45*7C<CR><LF>
$GPGSV,3,3,12,14,39,330,42,01,06,299,38,31,30,256,44,32,36,320,47*7B<CR><LF>
| Field | Name | Example | Description |
| 1 | Number of message | 3 | Total number of GSV messages to be transmitted (1-3) |
| 2 | Sequence number | 1 | transmitted (1-3) |
| 3 | Satellites in view | 12 | Total number of satellites in view (00 ~ 12) |
| 4 | Satellite ID | 05 | Satellite ID number, GPS: 01 ~ 32, SBAS: 33 ~ 64 (33=PRN120) |
| 5 | Elevation | 54 | Satellite elevation in degrees, (00 ~ 90) |
| 6 | Azimuth | 069 | Satellite azimuth angle in degrees, (000 ~ 359 ) |
| 7 | SNR | 45 | C/No in dB (00 ~ 99), Null when not tracking |
| 8 | Checksum | 72 | |
RMC – Recommended Minimum Specific GNSS Data
Time, date, position, course and speed data provided by a GNSS navigation receiver.
Structure:
$GPRMC,hhmmss.sss,A,dddmm.mmmmm,a,dddmm.mmmmm,a,x.xx,x.xx,ddmmyy,,,a*hh<CR><LF>
1 2 3 4 5 6 7 8 9 10 11
Example:
$GPRMC,211904.745,A,2447.96772,N,12059.63052,E,0008.04,203.92,170726,,,A*51<CR><LF>
| Field | Name | Example | Description |
| 1 | UTC Time | 212742.954 | UTC time in hhmmss.sss format (000000.000 ~ 235959.999) |
| 2 | Status | A | Status ‘V’ = Navigation receiver warning ‘A’ = Data Valid |
| 3 | Latitude | 2447.96772 | Latitude in dddmm.mmmmm format Leading zeros transmitted |
| 4 | N/S indicator | N | Latitude hemisphere indicator ‘N’ = North ‘S’ = South |
| 5 | Longitude | 12059.63052 | Longitude in dddmm.mmmmm format Leading zeros transmitted |
| 6 | E/W Indicator | E | Longitude hemisphere indicator 'E' = East 'W' = West |
| 7 | Speed over ground | 0008.04 | Speed over ground in knots (0000.00 ~ 0971.92) |
| 8 | Course over ground | 203.92 | Course over ground in degrees (000.00 ~ 359.99) |
| 9 | UTC Date | 170726 | UTC date of position fix, ddmmyy format |
| 10 | Mode indicator | A | Mode indicator ‘N’ = Data not valid ‘A’ = Autonomous mode ‘D’ = Differential mode ‘E’ = Estimated (dead reckoning) mode ‘M’ = Manual input mode ‘S’ = Simulator mode |
| 11 | Checksum | 51 | |
VTG – Course Over Ground and Ground Speed
The Actual course and speed relative to the ground.
Structure:
GPVTG,x.xx,T,,M,x.xx,N,x.xx,K,a*hh<CR><LF>
1 2 3 4 5
Example:
$GPVTG,317.20,T,,M,0017.68,N,00032.75,K,A*01<CR><LF>
| Field | Name | Example | Description |
| 1 | Course | 317.20 | True course over ground in degrees (000.00 ~ 359.99) |
| 2 | Speed | 0017.68 | Speed over ground in knots (0000.00 ~ 0971.92) |
| 3 | Speed | 00032.75 | Speed over ground in kilometers per hour (00000.00 ~ 01800.00) |
