An Unambiguous Tracking Method for GNSS Satellite Navigation Signals
A satellite navigation signal and unambiguous tracking technology, which is applied in the field of global navigation satellite systems, can solve the problems of easy false detection and missed detection in tracking, achieve the elimination of multi-peak characteristics, reduce the amount of related calculations, and avoid false detection and missed detection problem effect
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[0031] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:
[0032] A method for unambiguous tracking of GNSS navigation signals in an embodiment of the present invention, such as figure 1 shown, including the following steps:
[0033] Step 1: Multiply the received satellite navigation signal with the local carrier, perform carrier stripping (that is, signal demodulation), and then undergo secondary mixing to obtain the intermediate frequency input signal;
[0034] Step 2: Perform discrete Fourier transform DFT on the intermediate frequency input signal obtained in step 1 to obtain the frequency domain received BOC signal re_boc_fft;
[0035] For BOC(m,n) modulated signals, the spreading code rate is f c =n×f 0 , the subcarrier frequency is f sb =m×f 0 , f 0 = 1.023MHz. Each spreading code chip contains k=2×m / n subcarrier half periods, and the number of sampling points of each 1 / 2 subcarrier cycle chip of BOC modul...
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