数字化直接序列扩频接收机设计与实现

Design and Realization of a Digitized DS-SS Receiver

介绍了一种数字化DS/BPSK导航接收机设计方案与实现。该接收机采用了基于FPGA的硬件设计,结合数字信号处理算法完成信号的捕获、跟踪、位置解算。捕获采用大步进串行捕获方案,采用Tong算法判决策略,伪码跟踪采用全数字超前-滞后跟踪环(DDLL),载波跟踪采用全数字Costas环(DPLL)。最后对这种设计方案进行了试验。

The design and realization of a digitized DS/BPSK navigation receiver is introduced in the paper. In the receiver the FPGA chip based hardware design is adopted and digital signal processing algorithm is combined to realize signal acquisition, tracking and position calculation. A scheme of a larger step and serial acquisition is proposed, and the Tong decision algorithm is also applied in the receiver. The DDLL and the DPLL are used in order to track the PN phase and the carrier phase of received spread spectrum signals separately. Some experimental results are given.