Universal multi-channel distributed target echo simulation method and intermediate-frequency system

Abstract

The invention provides a universal multi-channel distributed target echo simulation method and intermediate-frequency system. The method comprises: a Doppler frequency caused by a distributed target geometric center without considering the autogiration characteristic and a radial speed of a radar and time delay caused by a distance are calculated; according to spatial distribution of scattering points of the target, a one-dimensional range image in a radial direction is calculated; a distributed target equivalent angle and orientation vectors are calculated; a target baseband echo signal is determined; rolling of a phase difference that is described by the orientation vector and is caused between channels due to a spatial angle is carried out to obtain target baseband echo signals of all channels; and up-conversion and digital-to-analog conversion are carried out to obtain a multi-channel distributed target intermediate-frequency echo signal. The intermediate-frequency system is an extensible system formed by a high-performance processing circuit having VPX architecture and a plurality of DAC array circuits. The method and the system provided by the invention can be applied to intermediate-frequency echo simulation of a digital array radar; and with adding of a transmitter array and an antenna array, the method and system also can be applied to radio-frequency echo simulation of a semi-physical simulation system.

Description

technical field [0001] The invention relates to the technical field of radar target echo simulation, in particular to a general multi-channel distributed target echo simulation method and an intermediate frequency system. Background technique [0002] The construction of high-precision and complex test conditions and environments is a crucial link and necessary condition in the development of multi-functional and high-performance radar systems. Various types of echo simulators, such as baseband echo simulators, intermediate frequency echo simulators and radio frequency echo simulators, have become an indispensable part of each stage of the radar system development process. [0003] Existing simulators are generally single-channel simulators, which cannot simulate the spatial angle characteristics of targets, while multi-channel simulators can flexibly realize the simulation of dynamic angle changes of multiple targets in space. In addition, the existing simulators are gener...

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Problems solved by technology

[0003] Existing simulators are generally single-channel simulators, which cannot simulate the spatial angle characteristics of targets, while multi-channel simulators can flexibly realize the simulation of dynamic angle changes of multiple targets in space

In addition, the existing simulators are generally simplified simulators using a single-scattering point target model, which cannot simulate the real target echo characteristics such as the dynamic change of the one-dimensional range image of complex multi-scattering point targets, and angle flickering.

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