AIS baseband signal receiving system and method suitable for spaceborne environment
A baseband signal and signal technology, applied in FM carrier system, modulated carrier system, transmission system, etc., can solve problems such as large interference, difficult maintenance, and limited coverage of shore-based AIS
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Embodiment 1
[0071] like figure 1 As shown, the present invention provides an AIS baseband signal receiving system suitable for a spaceborne environment, including a local signal generation module, a signal detection and frame synchronization module, a signal phase stripping module, a carrier synchronization module, and a frequency search and The maximum likelihood demodulation module for confidence calibration; the local signal generation module is used to use the 24bits training sequence and the 8bits start marker contained in the AIS message as the synchronization sequence of the signal, and perform GMSK modulation on the synchronization sequence to obtain local I, Q signals ; The signal detection and frame synchronization module is used to calculate the cross-correlation of the local I and Q signals based on the phase change to obtain the starting sample point of the signal; the signal phase stripping module is used to analyze the local signal according to the starting sample point of t...
Embodiment 2
[0080] like figure 2 As shown, the present invention provides an AIS baseband signal receiving method suitable for an on-board environment, and its implementation method is as follows:
[0081] S1. Local signal generation: The 24bits training sequence and the 8bits start marker contained in the AIS message are used as the synchronization sequence of the signal, and the synchronization sequence is GMSK modulated to obtain the local I and Q signals. The implementation method is as follows:
[0082] S101. Use the 24bits training sequence and the 8bits start marker contained in the AIS message as the synchronization sequence of the signal, and perform differential encoding processing on the synchronization sequence;
[0083] S102, using a Gaussian low-pass filter to smooth the phase path of the differentially encoded signal;
[0084] S103, performing integration processing on the smoothed signal;
[0085] S104, using GMSK modulation, take cosine and sine respectively for the si...
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