Intermediate-frequency and radio-frequency universal target simulator for pulse pressure radar

Abstract

The invention discloses an intermediate-frequency and radio-frequency universal target simulator for a pulse pressure radar. The target simulator comprises a power supply module, a reference source generating module, a control display module, an intermediate frequency analog signal generating module, an amplitude regulating module and a hybrid frequency filtering module; the amplitude regulating module is divided into amplitude regulating modules A and B; the hybrid frequency filtering module is divided into hybrid frequency filtering modules A and B; the power supply module is connected withother modules; the reference source generating module is respectively connected with the control display module and the intermediate frequency analog signal generating module; the control display module is respectively connected with the intermediate frequency analog signal generating module, the amplitude regulating module A and the amplitude regulating module B; the intermediate frequency analog signal generating module is respectively connected with the amplitude regulating module A and the amplitude regulating module B; the amplitude regulating module A is connected with the hybrid frequency filtering module A; and the amplitude regulating module B is connected with the hybrid frequency filtering module B. The target simulator provided by the invention has the advantages of simplifiedcircuit, pure frequency spectrum, integrity of the intermediate frequency and the radio frequency, abundant functions, real data and strong pertinence.

Description

technical field [0001] The invention belongs to the technical field of radar engineering and relates to a signal generating device, in particular to an intermediate frequency radio frequency universal target simulator under the pulse pressure radar system. Background technique [0002] The radar target simulator is a simulation device to realize the target information in the radar echo signal. It is used to evaluate and detect the back-end of the radar system when the front-end of the radar system is not yet available in the product development and debugging stage or based on saving test costs. [0003] The radar target echo signal mainly includes three kinds of effective information: amplitude information, which is brought about by changes in factors such as target distance, target reflection cross-sectional area (RCS), and antenna pattern modulation; Le shift (f d ); time-domain information, that is, the echo time delay caused by the distance change of the moving target. ...

AI Technical Summary

Problems solved by technology

like figure 2 As shown, this method uses two DDSs in the mid-frequency band to generate signals of different frequencies f 1 , f 2 , respectively with the radar local oscillator signal F L Two local oscillator signals F are obtained by the up-converter L1 , F L2 ; Simultaneously, the simulator will receive a radio frequency signal Fs, the Fs signal is down-converted with FL1 first, and then with the Fs through the controllable time delay circuit L2 Up-conversion, using two frequency conversions to obtain a difference from Fs by f d RF signal, f d It is the simulated Doppler frequency, which is essentially the frequency difference f generated by two DDSs 2 -f 1 , this method uses the idea of ​​intermediate frequency mixing and filtering to cleverly filter out the trouble of unwanted sidebands, but the circuit of this method is too complicated, which increases the size and cost

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