摘要
针对采用直接序列扩频(DSSS)体制的无人机卫星测控前向链路,提出了一种基于相关峰数量统计的诱骗信号识别方法。该方法将同模式的诱骗信号等效为多径信号,利用匹配滤波器对接收信号进行处理,通过迭代算法调整相关峰判决门限,并统计一段时间内的相关峰数量来识别诱骗信号。在扩频码周期为128,正交相移键控(QPSK)调制,1/2码率的信道编码,E_s/N_0为3 d B,1 024个码周期的统计周期,诱骗信号和合法信号延时大于1个码片长度的情况下,该方法可快速有效地识别诱骗信号。
A new method is proposed for identification of spoofing signal in the forward control l in k of un-manned aerial vehicle（UAV） in which Direct Spread Spectrum Sequence （DSSS）is applied. The method treats the same mode spoofing signal as multipath signal,and uses matched filters to process a l l the received signals. The iteration algorithm is used to adjust the correlation peak decision threshold and the receiver can identify the spoofing signal by counting the correlation peaks in certain duration. Simulation results are presented in the case that a spreading sequence with period 128,Quadrature Phrase Shift Keyin（QPSK） modulation and rate 1/2 channel coding is applied,and statistics of peaks is taken over 1 024 periods of chips with 3 dB Es /N0. The results indicate that this method can recognize the spoofing signal rapidly pro-vided that the time difference between legal and spoofing signal is greater than one chip duration.
出处
《电讯技术》
北大核心
2018年第2期162-166,共5页
Telecommunication Engineering
