How to get the RSSI and SNR on the drone transmitter?

Question: I noted that the TX900 webpage does not send RSSI data to the flight controller; it will not trigger a failsafe action when the radio link is lost. Is there any way to work around this issue?

Answer: RSSI wireless link status data requires customers (such as flight controllers) to manually send AT commands to obtain it. It can be obtained in two ways:

  1. Configure UART3 (data port 3rd) as an AT command serial port, and then send AT commands through UART3 (D3) to obtain.
  2. Update the firmware version 1.5.1 or above, so that there will be an additional TCP server inside for customers to access through TCP to send AT commands to obtain the wireless status.

Here is the explanation from our engineer.

  1. The LED light is used to indicate the wireless connection status (for example, if the wireless link is disconnected, the light will go out), and there is no dedicated external pin to notify the customer of flight control.
  2. Our core module has GPIO pins, but they are basically connected to LED lights. Our vcan1681 module also has such pins, but currently, it is also connected to LED lights.
  3. If you are willing to spend money on customization, we can customize a special one for you, and the external interface can be changed.
  4. When customers use our drone wireless video data links, they will definitely need to obtain air-side flight control information through the serial port or network port to the serial port.
  5. The general method is to add verification to the ground station software and flight control software to measure the reliability of the wireless link. At this time, you can completely sense the link quality and link disconnection events in the software, and then set the threshold in the software to alarm and handle it.
  6. That is to say, when the ground station software obtains the air system flight control information through our wireless link if the error rate exceeds a certain threshold, it can be considered that the wireless link has reached an unreliable threshold and needs to be processed. This is a common practice among Chinese drone companies.

Talking RSSI SNR for the below products

Question: Can you develop a new model for me? It is easy to get RSSI and SNR?

Do you just need to get the real-time status of whether the wireless link is connected/disconnected? Or do we need to obtain even RSSI?

Because a GPIO can only identify two states: 0/1, it can only be used to indicate whether the wireless link is connected/disconnected, and cannot express the values ​​of RSSI (the values ​​of RSSI and SNR still need to be obtained through AT commands)

If you need us to actively report information such as RSSI and SNR in addition to the status of the link being connected/disconnected, then you must operate according to the customized project. You need to clearly describe your needs, docking interfaces, etc. (instead of In a simple sentence), so that we can evaluate the difficulty of developing customization and the ways to achieve it.

Question About Product

  • Was the product you need not found?
  • Do the described here differ from your needs?
  • Do you want to change it to suit your project?
  • Do you still have questions about the product?
  • Please tell us to customize it for you.

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What is SNR and RSSI?

SNR (Signal-to-Noise Ratio) is a ratio-based metric that measures your signal in relation to the noise.SNR is made up of two values that are measured as a positive number between 0db and 120db, with the closer it is to 120db, the better: signal value and noise value, both of which are commonly reported in decibels (db).

The RSSI (Received signal strength indication) will look at the Signal (Also known as RSSI) first this value is measured in decibels from 0 (zero) to -120 (minus 120) now when looking at this value the closer to 0 (zero) the stronger the signal is which means it’s better, typically voice networks require a -65db or better signal level while a data network requires -80db or better.

Because the signal is affected by the AP’s transmit power and antenna, as well as the client’s antenna, the normal range in a network would be -45db to -87db depending on power levels and design.

Signal strength (RSSI, “signal strength”, Signal/Noise Ratio). It is often preferable to concentrate on RSSI.

  • RSSI -90 dBm: This signal is incredibly faint, and it is at the limit of what a receiver can receive.
  • RSSI -67dBm indicates a rather strong signal.
  • RSSI greater than -55dBm indicates a very strong signal.
  • RSSI > -30dBm indicates that your sniffer is right adjacent to the emitter.

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