相关法测量中的噪声信号源和扫频信号源的性能比较

Performance comparison between noise signal and chirp signal in correlation measurement

时差法相关测量中信号的带宽越宽,互相关函数的峰值点的峰值优势越大,其测量的抗干扰性能越好。通过理论分析和数学仿真研究了两种宽带信号源———噪声信号和扫频信号,并利用相关分析法测量两信号间时差时的性能。结论是:噪声信号频带范围宽,带宽不受所采用信号长短的限制,测量分辨力高,但其频谱与噪声干扰频谱相似,抗干扰能力差;扫频信号的频率和带宽可人为控制,频谱特征明显,抗干扰性能好。

In time-difference correlation measurement the broader the bandwidth of source signal is, the larger the superiority of peak value will be, thus the better the anti-jamming performance. Through theoretical analysis and mathematical simulations the performance of two kinds of band-wide signal source, named Noise signal and Chirp signal, in determined time difference of two signals in correlation measurement are investigated. Noisy signal can cover wider frequency range and its bandwidth is not limited by the length of signal used, thus have higher resolution. However its frequency spectrum is similar to that of noise disturbance, thus have poorer anti-interference ability. Chirp signal`s frequency and bandwidth are under the control of operator and its frequency spectrum feature is distinct,the anti-interference ability will be much better.