水陆两栖飞机的无线电高度数据处理方法研究

Study of the Radio Altimeter Data Processing Methods for Amphibious Aircraft

分析了水陆两栖飞机因水上起降和机腹船体构型导致的对无线电高度表数据进行零位基准修正、天线位置修正、负高度显示等特殊的处理要求。提出了零位基准设置的判据,建立了基于坐标变换矩阵,利用姿态角数据对零位基准设置、天线布置偏离零位基准等因素产生的测高误差进行修正的无线电高度数据处理方法,将姿态角的修正从俯仰角扩展到横滚角。应用该方法对某大型水陆两栖飞机的无线电高度表的高度数据进行处理,试飞表明该方法有效,提高了飞机在水上起降过程中无线电高度的指示精度,实现了水陆两栖飞机的负高度显示,能准确指示飞机着水离水过程,满足机组的试飞要求。

The special processing requirements for radio altimeter data are analyzed,such as zero reference correction,antenna position correction and negative altitude display due to water take-off and landing and belly hull configuration of amphibious aircraft.A method of radio altitude data processing based on the coordinate transformation matrix is proposed to correct the altimetric errors arising from the zero datum setting and the deviation of the antenna arrangement from the zero datum by using the attitude angle data,extending the correction of the attitude angle from the pitch angle to the traverse angle.The method is applied to process the altitude data of the radio altimeter of a large amphibious aircraft,and test flights show that the method is effective,which improves the accuracy of radio altitude indication during aircraft take-off and landing on water,realizes the negative altitude display of the amphibious aircraft,and can accurately indicate the process of aircraft landing and leaving the water,and meet the flight test requirements of the crew.