Method for capturing GNSS-BOS (Global Navigation Satellite System-Binary Offset Carrier) modulation signal
A modulation signal and signal 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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