General typical target characteristic simulation system

Abstract

The invention provides a general typical target characteristic simulation system which comprises an I / O frequency mixer, a modulator, a time delay optical fiber, a demodulator, a receiving end that are successively connected, the output end of the tested product is connected to the input end of the I / O frequency mixer and the I / O frequency mixer is further connected with two orthogonal signals, and the length of the time delay optical fiber is equal to the target distance required to be simulated. The device is small in size, light in weight, free of clutter interference, high in harmonic suppression degree, low in insertion loss, high in distance simulation precision, high in frequency precision, good in frequency stability, low in power consumption is low, and good in economical efficiency.

Description

technical field [0001] The invention relates to a general typical target characteristic simulation system. Background technique [0002] When a product is tested, it is necessary to simulate the characteristics of its typical target. The target characteristics include: target distance, echo Doppler frequency, and echo attenuation. [0003] For the simulation of the target distance in the range of 0.5m to 35m, the traditional method is to use the inherent delay of the radio frequency cable to realize the simulation, and for the simulation of the target distance in the range of 35m to 200m, the traditional method is to use down-conversion technology to convert the frequency to About 300MHz, and then use signal processing technology combined with software to simulate the delay time. For the simulation of the echo Doppler frequency, the traditional method is to multiply the delayed signal by the Doppler frequency, and then send it to the DA output after up-conversion. The comm...

AI Technical Summary

Problems solved by technology

The method of using the inherent delay of the radio frequency cable to realize the simulation of the target distance has large volume and weight, large insertion loss and high cost

The method of using up-conversion and down-conversion and combining software to realize the target distance simulation method, because the method itself takes a long time for signal processing, is only suitable for the simulation of medium and long-range target distances, and there are certain limitations in use, and the method , The down-conversion circuit is complex, the software code is many, and the versatility is not good

For the delayed signal, the Doppler frequency is multiplied, and then sent to the DA output after up-conversion to realize the method of echo Doppler frequency simulation. The circuit is relatively complicated and the volume is also large.

Images