An Improved FFT Acquisition Method for Weak Signal in Deep-Space Communications
In deep space communication, due to the restricted transmitted power, sharply-attenuated of signals because of long distance and all the noise in space, the received signals from the deep space have low signal to noise ratio (SNR) and high carrier phase noise. The Ultra long point FFT algorithm and binary branch acquisition technique were studied and the modified binary branch FFT acquisition method was proposed. The more flexible method has faster acquisition ability and higher detection probability. Based on the software radio technology, the hardware platform of FPGA + DSP was built to implement the 216 FFT using modified two-arm acquisition technique, the carrier wave acquisition and tracking were implemented on the condition of extra-low SNR and the test result indicated the method in this paper can implement the quick detection under the 16dBHz SNR or below.
Pan Xi Chen Ming
Beijing Institute of Technology, Beijing 100081, China Beijing Research Institute of Telemetry, Beijing 100076, China
国际会议
International Conference on Space Information Technology 2009(2009年第三届空间信息技术国际会议)
北京
英文
1-4
2009-11-26（万方平台首次上网日期，不代表论文的发表时间）