Radio altimeter signal simulation system

Abstract

The invention relates to a radio altimeter signal simulation system. The radio altimeter signal simulation system comprises a mathematical simulation calculation subsystem used for simulation to generate a model database required by simulation conditions and realizing conversion and management of the model database, and control and treatment of simulation process; an echo simulation subsystem which is connected with the mathematical simulation calculation subsystem, and is used for receiving model data and control instructions, and realizing conversion and output of model data into intermediate frequency signals; an altimeter equivalent unit which is connected with the echo simulation subsystem and the mathematical simulation calculation subsystem, and is used for simulating an actual altimeter, evaluating simulation capacity of the radio altimeter signal simulation system, and realizing retroconversion of signals into height values. The radio altimeter signal simulation system has flexible, economical, lifelike, and complex function simulation capacity, is capable of realizing real-time simulation operation and experimental verification of radio altimeters on total work environment, and is capable of providing support for testing experiments and performance evaluation of radio altimeters, and especially navigation control systems.

Description

technical field [0001] The invention relates to a radio altimeter signal simulation system, which belongs to the field of radio semi-physical simulation and testing. Background technique [0002] The radio altimeter is an important altitude information testing device in many aircraft control systems. Its function is to provide accurate altitude information for the aircraft control system during the aircraft's level flight, down pressure section and ultra-low altitude flight. Key equipment for precise navigation, terrain matching, and landing. [0003] Due to the diversity of radio altimeter working system, working parameters and working environment conditions, the difficulty and complexity of radio altimeter testing, simulation and experiment are greatly increased. [0004] Most of the special test equipment currently used is fixed-point testing, which can only test the performance of the altimeter at one or several altitudes during the working process, and cannot fully tes...

AI Technical Summary

Problems solved by technology

As documented in the paper "Hyper-physical simulation method of monopulse radar based on variable configuration", this method uses a high-speed DAC to limit the signal-to-clutter ratio of the echo signal, and at the same time, the cost is high and the signal quality is not high

However, it is recorded in the paper "Research on the Comprehensive Testing System of FM Millimeter-Wave Short-Range Radar Half-in-the-loop Simulation" that the system uses DDS (Direct Digital Synthesizer) technology to only simulate the target signal, which is too simple to represent the ground real electromagnetic environment

In addition, the paper "Research on a PD Radar Half-in-the-loop Simulation System" records that the system only delays and outputs the received echo signal after Doppler modulation, and cannot realize the delay of the echo signal of each scattering point on the ground. The inconsistency and RCS (Radar Cross Section, Radar Cross Section) are different, and the actual echo form is quite different, and the similarity of the simulation is not high

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