一种复合调制波形的测距性能分析

Analysis of Range Resolution for a New Combined Modulation Waveform

为获得伪码调相与线性调频复合调制连续波信号的测距性能,采用模糊函数方法,计算了复合调制信号的模糊函数,推导了测距精度的定量计算公式,分析了测距精度的影响因素,并进行了仿真验证.结果表明:调制频偏和码元宽度是影响复合调制波形测距性能的关键因素,且测距精度随调制频偏的增大和码元宽度的减小而提高;复合调制信号的测距精度高于单纯的伪码调相信号.

To obtain the range property of a novel combined modulation format--pseudo-random binary-phase code （PRBPC） and linear frequency modulation（LFM） combined modulation signal, the ambiguity function method is used. The ambiguity function of the combined modulation signal is calculated, the quantitative analysis formula about range resolution is obtained, and its influence factors are analyzed, whereas the simulation validation are processed. The results indicate that the key factors which influence the range resolution of combined modulation waveform are the frequency deviation and code width of pseudo-random code, the range resolution is improved along with the increase in frequency deviation and narrowing of the code width which is better than that of pseudo-random binary-phase code signal.