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As we saw above the he ranging process master generates an internal timer

An SX1280 assumes the master role, sends a ranging request, and initiates a ranging. The ranging request is sent to another SX1280 (which must be configured in slave mode) and the slave receives the incoming ranging request at any time. When the master sends a ranging request, it also starts an internal timer that acts as a ranging timer.

The slave receives the ranging request,Wireless modem which will process the incoming ranging request synchronously. The slave does not need to know when the ranging request was sent, but the master needs to know the processing time during the slave synchronization process (the following is the processing time in the ranging response sent by the slave, which is needed in the final distance calculation) Remove this processing time). The master and slave do not share the same timer, but separate and independent timing.

Finally, the slave sends the synchronized ranging response back to the master, and after the master receives the ranging response, the elapsed time, that is, the time it takes for the electromagnetic wave to propagate from the master to the slave again, and the synchronization process Time, infer the round-trip time of the flight, and infer the distance.

Here are some of the operations that can cause measurement errors during the SX1280 ranging process:

As we saw above, the ranging process master generates an internal timer that counts the time-of-flight (TOF) of the ranging signal. When the slave synchronizes the ranging request, a known delay (processing time) is generated. If the clock frequency of the slave is different from the frequency of the master clock, the data will be inaccurate during calculation, which will cause a distance offset. The source of this error is called the frequency error.


by fiberglasser | 2022-02-22 18:08 | Industrial Router/Ga | Comments(0)

Independently developed and produced products include LoRa/WiFi/Bluetooth/ZigBee wireless modules, 4G networking equipment, Ethernet modules, NB-IoT data transmission terminals, industrial IoT


by Fiberglasse