杂乱回波 meaning in Chinese

clutter

In the fourth chapter , firstly , the fsk / psk signal function is presented , then , the signal which frequency and phase are modulated by costas code and barker code for each are analyzed at the same time . after that , the target returns and clutter returns are analyzed and modeled . at last , both of the time correlation characteristics and space correlation characteristics are theoretically analyzed
在第四章中,首先给出fsk / psk信号的表达式,并对一种分别采用costas码和barker码进行频率和相位调制的fsk / psk信号进行分析,然后对fsk / psk信号的目标回波和杂乱回波进行分析与建模,接着,对杂波信号的时间相关性和空间相关性进行理论分析,由分析结果可知, fsk / psk雷达杂波的时间相关性不变、空间相关性增强。