General radio altitude simulator based on DRFM

Abstract

The invention discloses a realization method of a missile radio altimeter height signal simulator based on DRFM (Digital Radio Frequency Memory) technology. The method applies the DRFM technology to the radio altimeter signal simulating since the DRFM technology can retain the subtle features of the radio frequency signal. According to the method provided by the invention, continuous sampling cycle storage technology, address register cycle reset and pulse delay precision control technology are adopted, and as the method is based on DRFM system digital noise modulation technology and digital convolution filter technology, a series of technical problems of applying the DRFM technology to the altimeter signal environment are solved, highly numerical simulation precision control and continuous adjustable are realized and a plurality of interference signals of the radio altimeter can be simulated. And as the method is under use in a certain testing system developed in our institution, the effectiveness and the validity of the method is tested and verified.

Description

technical field [0001] The invention relates to a method for realizing a radio altimeter altitude signal simulator, which belongs to the technical field of equipment testing. The function of the simulator is to simulate the altitude signal of a radio altimeter at different altitude values, and is used to measure the altimeter at different altitudes. work performance. Compared with the traditional altitude simulator, it has the characteristics of high degree of digitalization, strong versatility, continuous program control and adjustable simulated altitude, and various interference information can be superimposed on the altitude signal. Background technique [0002] The radio altimeter was born with the application of airborne and missile-borne radio altimeters. Its function is to simulate and generate the altitude signal of the radio altimeter for testing the performance parameters of the altimeter. The initial missile altimeter altitude simulator uses the equivalent cable ...

AI Technical Summary

Problems solved by technology

However, for the radio altimeter of the FM continuous wave system widely used at present, the information overlap will be caused by the cycle delay, which cannot be applied

[0003] Whether it is an equivalent cable box, a surface acoustic wave delay line or an optical fiber delay line, it is impossible to simulate the continuous change of height, and it is also impossible to superimpose various interference information in the analog height signal, and the degree of digitization is low and the versatility is poor

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