收发一体式无线电高度表设计

为了满足中小型掠海飞行器对无线电高度表的需求,基于IVS948模块设计了一种收发一体式无线电高度表。采用线性调频连续波体制,分析对比了锯齿波和对称三角波调制信号对测量高度的影响,并对其它主要参数的选取进行了计算和分析;对软件运行流程中各个工作模式的关键环节进行了具体说明,并将FFT-CZT算法引入高度测量中。经过对工程样机的带飞试验,其测量数据与GPS差分高度数据相一致。结果表明,该型高度表工作可靠,测量数据可信,精度高,可用于中小型掠海飞行器的飞行控制系统。

Design of Transceiver Integrated Radio Altimeter

In order to meet the needs of small and medium grazing sea aircraft on the radio altimeters, a transceiver integrated radio altimeter was designed based on the IVS948 module. The influence of the sawtooth wave and the symmetrical triangular wave modulated signal on the measurement height was analyzed and compared with the linear frequency modulated continuous wave system. The selection of other main parameters was also calculated and analyzed. The key aspects of each working mode in the software operation flow were specified Description, and FFT-CZT algorithm into the height measurement. After the project prototype with the fly test, the measurement data and GPS differential height data consistent. The results show that the radio altimeter is reliable, the measurement data is credible and the precision is high. It can be used in flight control system of small and medium size skimming sea-based aircraft.