通过试飞测量大型直升机超短波天线的方向图

超短波天线方向图的精确测量对摸清机载通信系统性能底数,指导部队战术应用具有重要意义.针对传统试飞方法均不适用于大型直升机天线方向图测量的问题,通过分析大型直升机的飞行性能特点,提出了一种新的适用于大型直升机的超短波天线方向图试飞方法.通过分析计算给出了试飞中载机高度、速度、姿态等参数的限制数据,制定了详细的试飞流程,提出了逐架次、逐频点采集校准数据并完成校准曲线拟合的方法,得到了较高的测量精度.该方法已在某大型直升机定型试飞中进行了应用,试飞结果表明该方法的测量结果与传统测量方法之间的标准差在1.6 dB内,试飞效率提高了66%.

Determination of large-scale helicopter-borne V/UHF antenna radiation patterns by flight test

The accurate measurements of V/UHF antenna radiation patterns ( ARP ) is very important for testing the performance of airborne communication systems and guiding its operation. As the traditional test methods are not suitable for a large-scale helicopter, through the analysis of its flight characteristics, a new method of ARP measurement suitable for large-scale helicopters is proposed. Limit values of the flight parameters including altitude, velocity and attitude are given through calculation. The detailed process is also provided. By acquiring the calibration data of all test frequencies in each flight and completing the cal-ibration curve fitting, high precision is guaranteed. The method has been applied in the flight test of a large-scale helicopter and the results show that the standard deviation between this method and the tradi-tional method is within 1. 6 dB, and the flight test efficiency is improved by 66%.