소프트웨어 GPS 수신기용 다중비트 처리 기법 설계

Abstract

The software GPS receivers based on the SDR(Software Defined Radio) technology provide the ability to easily adapt to the other signal processing algorithms without changing or modifying the hardware of the GPS receiver. However, it is difficult to implement the software GPS receivers using a commercial processor because of the heavy computational burden for processing the GPS signals in real time. This paper proposes an efficient multi-bit GPS signal processing scheme to reduce the computational burden for processing the GPS signals in the software GPS receiver. The proposed scheme uses a compression concept of the multi-bit replica signals and patterned look-up table method to generate the correlation value between the GPS signals and the replica signals. In this paper, it is explained that the computational burden of the proposed scheme is much smaller than that of the typical GPS signal processing scheme. This paper evaluated the performance of the proposed software GPS receiver using a sampled IF data from the digitized signal acquisition equipment. The software GPS receiver shows a satisfactory navigation performance.