PD radar distance walking correction and phase-coherent accumulation method

Abstract

The invention discloses a PD radar distance walking correction and phase-coherent accumulation method, which belongs to the technical field of radar signal processing and weak target detection. The method comprises the steps that an echo signal containing a target is received by a PD radar; pulse compressing is carried out on the echo signal; traversing search is carried out to acquire the moving angle of an echo data coordinate after pulse compressing; the searched moving angle is used to move and convert each coordinate of echo data to correct the distance walking of the high-speed moving target; and finally, fast Fourier converting in a slow time domain is carried out on the echo data after distance walking correcting to realize phase-coherent accumulation detection of the target energy. According to the invention, the echo amplitude and the phase information of the moving target are simultaneously used to carry out phase-coherent accumulation; distance walking during accumulation is effectively corrected; the noise suppression of the echo signal is realized; the phase-coherent accumulation gain is greatly improved; and the rapid detection capability of the radar is improved, which is conductive to project implementation.

Description

technical field [0001] The invention belongs to the technical field of high-speed target detection in radar systems, and further relates to a PD radar range walking correction and coherent accumulation detection method, which can be used for radar accumulation and detection of high-speed targets in low signal-to-noise ratio environments. Background technique [0002] In recent years, with the rapid development of aerospace technology, more and more high-speed aircraft have appeared in the field of radar detection. Typical high-speed aircraft include intercontinental ballistic missiles, supersonic aircraft, and rockets. This type of aircraft has the characteristics of extremely fast flight speed, small geometric size, and strong stealth performance, which brings great challenges to radar detection. The traditional methods to improve the radar's ability to detect high-speed targets include adopting the preferred radar transmission frequency, increasing the transmission power ...

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Problems solved by technology

However, Keystone transform requires interpolation operation, which has interpolation loss and Doppler blur effect; AR-MTD algorithm has range estimation error and Doppler frequency expansion, which affects the parameter estimation of the target; Radon Fourier transform needs distance and Two-dimensional joint search of speed and coherent accumulation of target energy, the calculation is more complicated and blind speed sidelobe effect will appear in the accumulation

[0005] Generally speaking, the existing methods for correcting the distance movement of high-speed targets are mainly realized through interpolation calculations or multi-dimensional parameter searches, which have problems such as larger calculations, more complex implementation methods, and interpolation losses, which are not conducive to radar detection of high-speed targets. rapid real-time detection of

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