关键词: 混沌序列, 扩频码, 伪码测距, 捕获时间, 测距精度

Abstract: Chaotic sequence, with its good correlation performance, being sensitive to initial condition and hard to be decrypted, has been used as an ideal spread spectrum code in direct spread spectrum communication system. In order to take full advantages of the chaotic sequences ranging, based on the analysis of the basic principle of the pseudo code ranging and by using the digital matched filter to achieve the chaotic sequences acquisition, two chaotic spread spectrum ranging schemes were designed and their ranging processes, acquisition time and ranging accuracy were analyzed. The results show that taking the chaotic code as the spread spectrum code of ranging is feasible, with the strongpoint of high security, low interception, and it is also suitable for multi-target ranging, etc.

Key words: chaotic sequence, spread spectrum code, pseudo code ranging, capture time, ranging accuracy