钝头机体用嵌入式大气数据传感系统的改进三点式算法

THE MODIFIED TRIPLES ALGORITHM FOR FLUSH AIR DATA SENSING SYSTEM APPLIED TO THE VEHICLE WITH BLUNT FORE-BODIES

针对传统的用于钝头体飞行器的嵌入式大气数据传感系统的经典三点式算法对测压孔配置约束性严格的特点,对经典三点式算法进行了改进及验证。首先,对于经典三点式算法及改进算法进行了论述;其次,针对不同测压孔配置对算法精度的影响进行了系统的评估;最后,对于传统的经典三点式算法与改进三点式算法的优劣进行了比较。结论为:(1)改进的三点式算法对于测压孔的配置敏感性变差,即对测压孔约束很宽松,可用测压孔数增加,从而使得算法的适用性更强;(2)改进的三点式算法的精度与三点式算法相当,但是需要对测压孔进行系统选取及对比验证。

In view of the restrictive requirement of the pressure port configuration for the flush air data sensing(FADS)system based on the classical triple algorithm,a modified triple algorithm is developed and verified.Firstly,the classical triple algorithm and the modified triple algorithm are described.Secondly,the feasibility of the FADS system based on the modified triple algorithm including the pressure port configuration and the solving accuracy is evaluated.Finally,the advantages and the disadvantages of these two different methods are compared.The following results are obtained:(1)The solving accuracy becomes much less sensitive to the pressure port configuration for the FADS system based on the modified classical triple algorithm than that based on the classical triple algorithm.Therefore,much more pressure configurations can be used to predict the flight parameters and the restrictive requirement of the pressure port configuration is not necessary.(2)The solving accuracy differences between these two different methods is small,and the pressure port configuration still need to be verified.