正交Chirp信号数字产生方法

Digital Signal Generation for Orthogonal Chirp Signal

提出了一种正交Chirp信号的数字产生算法,具有运算量小和存储容量要求低的特点.该算法用二阶时变参数ARMA模型来表示Chirp信号,避免了Chirp信号产生中常规DDS技术的正弦函数的计算和相位截断效应.通过采用二阶时变参数ARMA模型,由于实时计算出了信号的及时值,并不需要有查找表,所以能将数据字长做到很大,可以大大降低幅度量化带来的误差.

In this paper, a new method of digital signal generation for orthogonal chirp signal is provided. The algorithm is with low computational complexity and very low memory. Time-varying parameters of the ARMA model in this paper processes chirp signal, it avoid computation of sinusoidal function in chirp signal generation and phase tnmcation. By using this Time-varying parameters ARMA model, real time processes signal, checking or searching tables is not needed, so it can do well data word-length and reduce error consumedly in amplitude quantization.