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How to synchronize the start time of tx and rx?

Category: Software



We are trying to achieve FMCW radar using X-band radar platform. But the received signal varies each time in the unchanged scene. In this case, we cannot get the right beat frequency. We think it maybe because the start time of Tx and Rx are random. So we are wondering how to set the start time of tx and rx or how can we get the start time information of tx and rx so that we can calculate the time difference which represents the target range? 

We would be really appreciated if you could help us!