线性模型参数辨识的特制扫频信号设计

Tailored Sweep Signals Design for Parameter Identification of Linear Model

在飞机或导弹的飞行辨识实验中,总是希望激励信号能够在时域、频域相互正交,并且具有较小的相对峰值因子,可对系统产生冲击。为了减小对系统的冲击,提出了一种设计特制扫频信号的方法,设计出的特制扫频信号能在较短的时间内对系统进行较充分的激励,且可不完全依赖于先验信息,设计方法简单。最后将该激励信号应用在飞机模型参数的辨识中,实验结果表明,上述设计的扫频信号,不仅设计方法简单,且能有效提高辨识精度,具有较高的应用价值。

In the flight experiments of the aircrafts or missiles, the excitation signals need to be mutually orthogohal in both time and frequency domains with low relative peak factors, so that the impact to the system can be reduced. A method for designing tailored sweep signals was introduced in this paper. It is easy to design the tailored signals which can make the systems fully excited in a short time and do not need much priori information. At last, the proposed method was applied to identify linear dynamic models of an aircraft. The result shows that the sweep signals have a high practical value which can effectively improve the identification precision.