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相位连续的DS/FH(Direct Sequence/Frequency Hopping,直接序列/跳频)扩频信号的扩频带宽比直扩信号更宽,在电离层的非线性相位以及跳频频点变化这两者的共同作用下,该信号的BPSK(Binary Phase Shift Keying,二相相移键控)解调性能明显恶化。依据随机变量概率分布的数学规律,推导得到了在背景电离层色散条件和跳频频点均匀分布前提下,某种DS/FH卫星测控信号的引导信号和长周期信号BPSK误码率的变化规律,并在特定信号参数条件下进行了误码率仿真。
The phase spreading DS / FH (Direct Sequence / Frequency Hopping) spread spectrum signal has a wider spreading bandwidth than the DSSS signal. In the common phase of the ionospheric nonlinear phase and frequency hopping frequency change The BPSK (Binary Phase Shift Keying) demodulation performance of the signal obviously deteriorates. Based on the mathematical rules of the probability distribution of random variables, the variation rules of pilot signal and long-period BPSK bit error rate of some DS / FH satellite signal under the premise of background ionospheric dispersion and frequency hopping frequency distribution are derived. And the bit error rate simulation under certain signal parameters.