Method for capturing GNSS-BOS (Global Navigation Satellite System-Binary Offset Carrier) modulation signal
A signal modulation technology, applied in the field of navigation and positioning, can solve the problems of unsuitable GNSS signals and long time consumption, and achieve the effects of long-time integration, improved sensitivity, and shortened processing time
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[0038] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0039] The present invention proposes a method for capturing GNSS-BOC modulated signals, such as figure 1 shown, including the following steps:
[0040] Step 1. After the received intermediate frequency input signal is stripped from the carrier, it is divided into K sections, each section is N milliseconds of input data, wherein K≥2, N≥1;
[0041] Step 2: The local pseudo-random code Local_PRN signal is modulated by the subcarrier to generate a BOC-modulated local Local_BOC signal, and there are two signals of the BOC-modulated local Local_BOC signal and the local pseudo-random code Local_PRN signal at the same time. Because the correlation value of the PRN code depends on the accumulation result of the value corresponding to the value -1 in the PRN code. Therefore, in the process of using Fourier transform FFT for correlation calculation, after changing the median...
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