Radar vibration detection sensitivity calculation method

Abstract

The invention discloses a radar vibration detection sensitivity calculation method. According to the method, first of all, based on micro vibration target echo signals, a micro vibration phase lead-out vibration detection model is established; secondly, according to the micro vibration phase lead-out vibration detection model, in accordance with average power PS of distance pulse pressure peak signals S when a target is stationary under a noise-free condition and average power PN of a thermal noise component N in slow time echoes composed of distance unit peak points where the vibration target is disposed, thermal noise equivalent average vibration amplitude NEA0 is obtained; based on the micro vibration phase lead-out vibration detection model, according to average power P phi of phase noise, phase noise equivalent average amplitude PEA0 is obtained; and finally, on the basis of NEA0 and PEA0, based on the condition that an output signal-to-noise ration SNRo is greater than and equal to a minimum detectable signal-to-noise ratio SNRmin, sensitivity Smin of vibration detection of a system is obtained. The method can guide design of a vibration detection radar system and evaluate the effect of vibration detection performance of a vibration detection radar.

Description

technical field [0001] The invention belongs to the technical field of radar vibration measurement, and in particular relates to a radar vibration measurement sensitivity calculation method. Background technique [0002] Micro-vibrations are ubiquitous in nature, such as the body movement of the human body (the movement of the chest during heartbeat and breathing), the swing of pedestrians' hands and legs, the vibration of bridges and wings, the rotation of helicopter rotors and antennas on warships and armored vehicles, and the warheads of ballistic missiles. tremor and so on. According to the Doppler theorem, when the electromagnetic wave irradiates the vibrating target, the target will modulate the radar echo Doppler, as long as the echo signal is demodulated, the vibration information of the target can be obtained, so as to achieve the function of vibration measurement. The application prospect of radar vibration measurement is very extensive: in disaster and accident r...

AI Technical Summary

Problems solved by technology

Because thermal noise and phase noise will seriously affect the phase at the range unit where the target is located, the micro-vibration information will be covered up, resulting in unreliable micro-vibration measurement results of the system

However, there are still no systematic analysis methods and conclusions for the ability of detecting and measuring micro-vibration signals in actual radar systems containing thermal noise and phase noise.

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