Several years ago Skytraq introduced NavSpark mini, a tiny (17x17mm) GPS module, that sold for $6. I got one and wrote a post explaining how to get started with the GPS module using GNSS viewer program.
The company contacted me again today, as they’ve now launched an even smaller module Skytraq PX1122R measuring just 16x12mm, supporting GPS, Galileo, GLONASS, and Beidou signals, as well as Real-time Kinematic (RTK) relative positioning technique that allows for 1-3cm positioning accuracy.
- Chipset – SkyTraq PX100 Phoenix GNSS chipset
- Supported GNSS standards & bands – GPS L1/L2C, Galileo E1/E5b, Beidou B1I/B2I, GLONASS L1/L2, QZSS L1/L2C
- Integrated RTK with 1cm + 1ppm RTK accuracy in seconds (under 10 seconds)
- Up to 10Hz quad-GNSS RTK update rate
- Base or rover mode configurable
- Serial Interface – 3V LVTTL level
- 24x castellated holes with UART, RF input, 1PPS, Reset, 3.3V, GND (most pins not used)
- Input Voltage – 3.3V DC +/‐10%
- Current Consumption – 50mA
- Dimensions – 16 x 12.2 mm
- Weight – 1.7 grams
- Temperature Range – ‐40°C ~ +85°C
Centimeter-level precision can be used for agriculture, machine control guidance (UAV), survey and GIS data collection, structure, and deformation monitoring. RTK applications require a base and a rover. The base can either be a third-party RTK base station service, or a PX1122R module configured accordingly.
PX1122R module is also compatible with PPP services such as OPUS, AUSPOS, CSR-PPP, etc.. by submitting a dual-frequency RINEX log file converted from carrier phase raw measurement log file of a single PX1122R.
To help getting started with the module, the company also offers a breakout board (pictured above), as well as PX1122R-EVB “PX1122R Multi-Band Quad-GNSS RTK Evaluation Board” with USB, UART, and Bluetooth SPP (Serial Port Profile) interface. The Bluetooth SPP interface allows rover NTRIP client connection to remote non-line-of-sight RTK base via a smartphone connected to the Internet and running a mobile app such as ArcPad or Esri Collector.
Skytraq PX1122R mass-production will start/has started this month, and while RTK positioning looks promising, RTK module and boards do come at a much higher price with PX1122R going for $99, while the breakout board goes for $125, and the evaluation board for $150. You’ll find all three on Navpark Store. You’ll find more details including a getting started guide, a datasheet, GNSS viewer program, and firmware on the respective product pages on the store.
The video above shows RTK initialization in GNSS viewer program.