Unmanned aerial vehicle data link frequency offset detection method
A data link and frequency offset detection technology, applied in the field of signal processing, to achieve the effect of improving accuracy and reducing waste of system resources
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[0040] The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.
[0041] A frequency offset detection method applicable to unmanned aerial vehicle data link of the present invention, for the data link with QPSK as the modulation mode, the flow structure block diagram of the uplink frequency offset detection is as follows figure 1 shown, including the following steps:
[0042] Step 1: Data link system function initialization;
[0043] At the transmitting end of the data link system, the symbol mapping of this design adopts QPSK mapping. The baseband modulation process of QPSK includes serial-to-parallel conversion and single-to-bipolar conversion. After mapping, the data is divided into two channels, I and Q. The two signals are framed separately. The structure of the signal frame is: synchronous information sequence, followed by repeating the frame start, data area, che...
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