Method for improving target angle measurement precision of NLFM waveform radar

Abstract

The invention discloses a method for improving target angle measurement precision of an NLFM waveform radar. The method comprises the steps of carrying out first pulse compression processing on a radar target echo signal to obtain a first pulse pressure echo signal; performing beam forming processing on the first pulse pressure echo signal to obtain a beam forming result; carrying out Doppler frequency shift processing on the beam forming result through a Doppler filter to obtain a Doppler frequency estimated value; performing second pulse compression processing on the radar target echo signalaccording to the Doppler estimation value to obtain a second pulse pressure echo signal; and performing sum-difference beam phase comparison monopulse angle measurement on the second pulse pressure echo signal to obtain the radar target measurement angle. According to the method for improving the target angle measurement precision of the NLFM waveform radar provided by the invention, the completely matched pulse response filter is designed by utilizing the Doppler frequency estimation of the radar target echo signal, the pulse compression processing of the radar target echo signal is carriedout, and the signal-to-noise ratio loss of angle estimation data is reduced, so that, the angle measurement precision is improved, and the performance is stable.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a method for improving the angle measurement accuracy of an NLFM waveform radar target. Background technique [0002] Non-Linear Frequency Modulation (NLFM for short) signals can be directly matched and filtered without windowing, avoiding the main lobe broadening and the loss of signal-to-noise ratio caused by windowing. In recent years, it has been favored by the radar industry General attention. [0003] In addition to being affected by system parameters, estimation methods and antenna aperture, radar target angle measurement accuracy is also inseparable from target signal-to-noise ratio. Therefore, to improve the accuracy of angle measurement, it can be done by improving the signal-to-noise ratio. The conventional angle measurement method proposed by Zhao Yongbo et al. in the article "A single-pulse angle measurement method in the case of multipl...

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Problems solved by technology

[0004] However, this method suffers from signal-to-noise ratio loss due to its detection channel signal processing. For example, when the radar transmits NLFM waveforms, the impulse response filter used for pulse compression does not take into account the Doppler information of the target, and its output has certain signal Noise ratio loss, which affects the accuracy of target angle measurement

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