On-board spread spectrum signal correlation detection design based on FFT
Jiyang Yu, Bo Pang, Huang Dan, Shen Xiao-hu, Wang Lu-yuan · 2016
According to the requirement of the navigation satellite in orbit power, limited hardware resources and the high real-time of spread spectrum communication, an efficient FFT based fast correlation detection design of high efficiency onboard is proposed. First, the navigation satellite spread spectrum signal acquisition is described, the existing methods are analyzed which require a lot of hardware resources, further miniaturization is not conducive or practical to the development of communication module on-board; then, the algorithm of the acquisition process of spread spectrum signal is improved, and FFT based method is used to combine the digital down conversion process with the pseudo code to simplify the hardware implementation, in which a matched filter is used to complete the correlation detection of IF signal; and, the corresponding hardware design structure is given according to the improved theory method; At last, based on the design method of this paper, the experiment is carried out in FPGA, which is compared with the previous design. Compared to the previous design, the proposed has less resource occupation, faster maximum speed, the experimental results show the effectiveness of the design itself.