飞行数据用于气动参数辨识时几个影响因素的研究

STUDY OF AERODYNAMIC PARAMETER IDENTIFICATION BY USING FLIGHT DATA

本文通过对飞行数据的分辨率、采样率、样本长度及传感器的动特性对气动参数辨识的影响的研究,确定了用于气动参数辨识的量测设备的分辨率及采样率均不能低于某一下限,否则参数的估计不可信。并以表格的形式给出了不同分辨率、采样率、样本长度下的估计结果。传感器时间延迟对参数估计的影响较大,但减小传感器时间常数不可能从根本上提高参数估计的精度。

Some influences upon aerodynamic parameter identification of resolution, sampling rate and sample length of the flight data and dynamic characteristic of sensor are discussed. Certain lower limit of resolution and sampling rate of measurement equipment used in aerodynamic parameter identification has been detemined. The estimative results in different resolutions, sampling rate and sample length are given in the form of table. The influence of sensor time delay upon parameter estimation is stronger. But, the accuracy of parameter estimation by reduction of the sensor time constant can not be fundamentally increased.