Introduction
USB GPS Receiver
This GPS receiver brings much more accurate and faster positioning performance with stronger signal compared with traditional GPS receivers. It is compact, lightweight and portable. Integrated with built-in receiving antenna, this product adopts a high-precision positioning chip and industrial-grade manufacturing process so that it can meet the positioning requirements of both industrial-grade and personal use. The GPS receiver has battery inside for supplying power for storing satellite data, such as satellite signal status, final position and time that would greatly increase the positioning speed at the module’s next boot. In addition, this receiver adopts USB interface, which can be conveniently used in maincontrollers like Raspberry Pi, NVIDIA, LattePanda. It is suitable for vehicle navigation, handheld positioning, wearable devices and other fields.
USB GPS Receiver (2m Extension Cable)
This is an Ublox chip-based GPS receiver module of low power and high sensitivity that can receive 56 channels satellite signal. Compared with traditional GPS receivers, it brings much more accurate and faster positioning performance with stronger signal. Integrated with built-in receiving antenna, this product adopts a high-precision positioning chip and industrial-grade manufacturing process so that it can meet the positioning requirements of both industrial-grade and personal use. The GPS receiver has battery inside for supplying power for storing satellite data, such as satellite signal status, final position and time that would greatly increase the positioning speed at the module’s next boot. Besides, this receiver adopts USB interface, which can be conveniently used in maincontrollers like Raspberry Pi, NVIDIA, LattePanda. The module has a 2m USB cable and its bottom is magnetic which makes it able to be easily attached to metal objects. It is suitable for vehicle navigation, handheld positioning, wearable devices and other fields.
Specification
- Chip: UBX-G7020-KT
- Frequency: L1, 1575.42MHz/L2,1561.10MHZ/L3,1602.00MHZ
- Baud Rate: 4800,9600,19200,38400,57600,115200bps
- Receiving Channel: 56CH
- Sensitivity: tracking -162dBm; Acquisition: 160dBm; cold start: -148dBm
- Cold Start: 29s average
- Warm Start: 3s average
- Hot Start: 1s average
- Accuracy: horizontal position accuracy<2.5M, SBAS<2.0M
- Timing Accuracy: 30ns
- Update Rate: 1Hz
- Operating Temperature: -40℃~85℃
- Storage Temperature: -40℃~85℃
Tutorial
1. NMEA0183 Protocol Introduction
Connect USB GPS receiver to your computer, and place in an open space. Check sensor data on via serial assistant.
The sensor will output the following data:
$GPGGA,061831.000,2236.9152,N,11403.2422,E,2,07,1.1,144.0,M,-2.2,M,4.8,0000*60
$GPGSA,A,3,18,22,25,12,14,21,24,15,,,,,1.93,1.04,1.63*01
$GPGSV,3,1,11,12,40,089,45,14,37,314,46,15,10,078,44,18,77,096,43*72
$GPGSV,3,2,11,21,27,192,31,22,60,330,43,24,24,037,45,25,42,142,41*71
$GPGSV,3,3,11,31,21,230,27,42,51,128,37,50,46,122,39*4D
$GPRMC,061831.000,A,2236.9152,N,11403.2422,E,0.00,,130214,,,D*76
$GPVTG,309.62,T, ,M,0.13,N,0.2,K*6E1.1 GGA
Sample Data: $GPGGA,061831.000,2236.9152,N,11403.2422,E,2,07,1.1,144.0,M,-2.2,M,4.8,0000*60
| Name | Example | Unit | Description |
|---|---|---|---|
| Message ID | $GPGGA | GGA protocol header | |
| UTC time | 061831.000 | hhmmss.sss | |
| Latitude | 2236.9152 | ddmm.mmmm | |
| N/S Indication | N | N=North, S=South | |
| Longitude | 11403.2422 | dddmm.mmmm | |
| E/W Indication | E | W=West, E=East | |
| Position Indication | 2 | 0:unpositioned 1:SPS mode, position valid 2:Differential, SPS mode, position valid, 3:PPS mode, position valid | |
| Satellites Used | 07 | Range: 0 to 12 | |
| HDOP | 1.1 | Horizontal Precision | |
| MSL Altitude | 144.0 | Meters | - |
| Unit | M | Meters | |
| Geoidal | -2.2 | Meters | - |
| Units | M | - | |
| Differential Time | 4.8 | Second | Invalid when DGPS is not used |
| Differential ID | 0000 | ||
| Checksum | *60 |
1.2 GSA
Sample Data: $GPGSA,A,3,18,22,25,12,14,21,24,15,,,,,1.93,1.04,1.63*01
| Name | Sample | Unit | Description |
|---|---|---|---|
| Message ID | $GPGSA | GSA protocol Header | |
| Mode 1 | A | M=Manual(forced to operate in 2D or 3D mode), A=Automatic | |
| Mode 2 | 3 | 1:Position invalid, 2:2D Position, 3:3D Position | |
| Satellite used | 18 | Channel 1 | |
| Satellite used | 22 | Channel 2 | |
| Satellite used | 25 | Channel 3 | |
| Satellite used | 12 | Channel 4 | |
| Satellite used | 14 | Channel 5 | |
| Satellite used | 21 | Channel 6 | |
| Satellite used | 24 | Channel 7 | |
| Satellite used | 15 | Channel 8 | |
| ,,, | ,,, | ,,, | ,,, |
| Satellite used | Channel 12 | ||
| PDOP | 1.93 | Position Precision | |
| HDOP | 1.04 | Horizontal Precision | |
| VDOP | 1.63 | Vertical Precision | |
| Checksum | *01 |
1.3 GSV
Sample Data:
$GPGSV,3,1,11,12,40,089,45,14,37,314,46,15,10,078,44,18,77,096,43*72
$GPGSV,3,2,11,21,27,192,31,22,60,330,43,24,24,037,45,25,42,142,41*71
$GPGSV,3,3,11,31,21,230,27,42,51,128,37,50,46,122,39*4D| Name | Sample | Unit | Description |
|---|---|---|---|
| Message ID | $GPGSV | GSV protocol header | |
| Number of messages | 3 | Range 1 to 3 | |
| Message Number | 1 | Range 1 to 3 | |
| Number of satellites | 11 | ||
| Satellite ID | 12 | Range 1 to 32 | |
| Elevation | 40 | Degrees | Max 90° |
| Azimuth | 089 | Degrees | Range 0 to 359° |
| SNR（C/No） | 45 | dBHz | Range 0 to 99, null when not tracking |
| Satellite ID | 14 | Range 1 to 32 | |
| Elevation | 37 | Degrees | Max 90° |
| Azimuth | 314 | Degrees | Range 0 to 359° |
| SNR（C/No） | 46 | dBHz | Range 0 to 99, null when not tracking |
| Satellite ID | 15 | Range 1 to 32 | |
| Elevation | 10 | Degrees | Max 90° |
| Azimuth | 078 | Degrees | Range 0 to 359° |
| SNR（C/No） | 44 | dBHz | Range 0 to 99, null when not tracking |
| Satellite ID | 18 | Range 1 to 32 | |
| Elevation | 77 | Degrees | Max 90° |
| Azimuth | 096 | Degrees | Range 0 to 359° |
| SNR（C/No） | 43 | dBHz | Range 0 to 99, null when not tracking |
| Checksum | *72 |
1.4 RMC
Sample Code: $GPRMC,061831.000,A,2236.9152,N,11403.2422,E,0.00,,130214,,,D*76
| Name | Sample | Unit | Description |
|---|---|---|---|
| Message ID | $GPRMC | RMC Protocol Header | |
| UTC Time | 061831.000 | hhmmss.ss | |
| Status | A | A=Data valid; V=Data invalid | |
| Latitude | 2236.9152 | ddmm.mmmmm | |
| N/S Indication | N | N=North, S=South | |
| Longitude | 11403.2422 | dddmm.mmmm | |
| E/W Indication | E | W=West, E=East | |
| Speed over Ground | 0.00 | Knot（Knots） | |
| Course over Ground | Degrees | ||
| Date | ddmmyy | ||
| Magnetic variation | - | ||
| Checksum | *76 |
1.5 VTG
Sample Data: $GPVTG,309.62,T, ,M,0.13,N,0.2,K*6E
| Name | Sample | Unit | Description |
|---|---|---|---|
| Message ID | $GPVTG | VTG protocol header | |
| Course over Ground | 309.62 | Degrees | |
| Reference | T | True | |
| Course over Ground | 309.62 | Degrees | |
| Reference | M | Magnetic | |
| Speed | 0.13 | Knot（Knots） | |
| Unit | N | Knots | |
| Speed | 0.2 | km/hr | |
| Unit | K | km/hr | |
| Checksum | *6E |
On Windows or LattePanda
- Download and install Google Earth.
- Connect USB GPS module to your Computer or LattePanda, and open the Google Earth.
- Configure as follows.
If the picture has been jumping far and near, you can click stop, and then click start after it is stable.
Read GPS Data on Raspberry Pi, Jetson Nano, or Linux
- Download program, and plug in USB GPS receiver.
Taking Raspberry Pi as an example, same to Nano and Linux.
Input the following commands at the terminal
cd ..... //Directory of the file you want to save
git clone https://github.com/DFRobotdl/USB_GPS_EN.git //Download program from Github
cd USB_GPS_EN
- Check device
Input:
sudo ls -l /devFind the device you just connected.
- Open the previously downloaded min. C file, change the device port in the program to be consistent with the actual one, and save it.
- Open the folder of the program on the terminal, compile and run.
cd ..... /USB_GPS_LINUX
gcc -o GPS main.c
sudo ./GPS
- Copy the GPS data to the Google Map
FAQ
For any questions, advice or cool ideas to share, please visit the DFRobot Forum.