Acquisition design and implement of Beidou B3I signal based on GPU

China's Beidou satellite navigation system (BDS) has developed rapidly in recent years. In 2018, China recently publicized the latest Beidou system space signal interface control file (ICD) of the Beidou B3I. Since the Beidou B3I signal has only been released for a short time, there are no references for its implementation. Based on the research on the development status of signal acquisition at home and abroad, this paper studies the real-time problem of software receivers and optimize the module in the capture process on graphic processing unit (GPU) according to the characteristics of B3I signal, design and implement a Beidou B3I software receiver capture architecture and algorithm based on GPU. By comparing with acquisition on CPU, each computing module achieves a GPU/CPU acceleration ratio of 4-50 times, the overall signal acquisition speed has been improved by 2.5 times, and the real-time performance of Beidou B3I software receiver has been effectively improved. At the same time, aiming at the problem of Beidou signal acquisition accuracy, a secondary capture method is designed to improve the capture accuracy. In addition, an optimization idea based on compute unified device architecture (CUDA) programming is proposed to further parallel computing performance on GPU.