Multi-mode GNSS (Global Navigation Satellite System) signal capturing method and device based on segmented cyclic correlation

The invention provides a multi-mode GNSS (Global Navigation Satellite System) signal capturing method and device based on segmented cyclic correlation. The method comprises the following steps: performing spreading code processing; performing intermediate frequency down-conversion, resampling and segmentation processing on the satellite data; performing Doppler down-conversion to obtain zero Doppler satellite data; performing segmented cyclic correlation operation to obtain a segmented cyclic correlation result Ri, j; performing coherent integration on the Ri, j according to a capturing sensitivity requirement to obtain RCn; carrying out capture judgment according to the RCn; and when the capture fails, Doppler update calculation is carried out. According to the method, the point number of FFT is reduced through segmented processing, hardware resources are reduced, and meanwhile the characteristics of being compatible with capturing of various types of satellites are met. 本发明提供一种基于分段循环相关的多模式GNSS信号捕获方法及装置。该方法包