Tech Chat | Mastering RTK Radio Mode Setup for Seamless Surveys
In our day-to-day RTK surveying, we usually use GSM or radio to transmit correction data from base to rover. Compared with the configuration of GSM mode, the parameters of radio mode may be more difficult to understand, such as serial port baud rate, air baud rate, radio channel, and frequency. In this blog, let’s unravel the intricacies of these concepts to empower you in achieving a seamless RTK radio mode setup.
Serial Port Baud Rate
When configuring the base station as external radio mode, understanding the serial port baud rate becomes paramount. This parameter, denoting the transmission rate between the RTK device and external radio via a 7-pin to 7-pin serial cable.
Choosing the Right Baud Rate:
- Options: 4800, 9600, 19200, 38400, 57600, 115200.
- Consistency is Key: Set the baud rate consistently at both base and rover for effective communication.
- Consider Data Size: The baud rate should align with the amount of data transmitted. Too small a baud rate may result in incomplete data transmission.
- Unit Conversion: Serial Baud Rate ÷ 10 ÷ 1024 = KB per second.
E.g. 9600 bps serial baudrate = 9600/10/1024 KB/s = 0.96 KB/s
- Recommendation: Opt for baud rates above 19200 to meet the increased data requirements of BDS.
- Pro Tip: SingularXYZ SDL1 external radio defaults to 38400 baud rate. Ensure your base station matches this value for optimal performance.
Air Baud Rate & Protocols
Distinguished from serial baud rate, air baud rate dictates the wireless transmission rate, which is used for internal radio mode. Balancing the rate is crucial, as higher baud rates mean larger data transmission amount and faster transmission but shorter distances due to signal wavelength considerations.
- Protocol Alignment: Base and rover must use the same radio protocol and air baud rate for effective communication.
- Example: SingularXYZ Y1 GNSS receiver with Lora radio offers baud rates like 500/11000/12500/15500/18000 bps, while normal radio options include 9600/19200 bps with protocols like Transparent, TT450S and etc.
- Note: Lora radio receivers are incompatible with normal radio receivers in radio mode.
Radio Channels and Frequencies
For SingularXYZ devices, channels 1-9 have fixed frequencies (454.05-463.05Mhz), with additional customizable channels. When opting for custom channels, ensure base and rover frequencies align.
- RTK External Radio Mode: Maintain consistency in serial port baud rate, radio protocol, air baud rate, and frequency between base station and external radio.
- RTK Built-in Radio Mode: Align radio protocol and frequency between base and rover stations.
Learn more about SingularXYZ RTK receivers with radio work mode.