The weak GPS signal parallel processing algorithm in dual-core based GPS software receiver

The basic GPS signal acquisition and several weak signal processing algorithms based on FFT is presented in this paper. Considering the sensitivity and the time consuming issues, a weak GPS signal parallel processing algorithm based on Duo-Core is proposed in the framework of a software GPS receiver. This method was developed for the acquisition of weak signals without a priori information. Based on Duo-Core processor, a parallel processing improvement is designed and implemented. This algorithm average assigns signals over the two cores, and parallel processes them simultaneously. After that, a threshold determination is given. At last a set of IF real data is collected in a dense urban area of Hong Kong. The method has been examined by two tests using the real sampled data. The results demonstrate that the available signals have been successfully enhanced from 4 satellites to 8 satellites; the sensitivity and processing speed of the GPS receiver has been improved and the scheme in this software receiver can be used to acquire the GPS signal under weak signal situations.