Ground moving target detection and parameter estimation method

Abstract

The invention provides a ground moving target detection and parameter estimation method. The technical scheme realizes the moving target detection and two-dimensional velocity estimation by combining with an interference image sequence with multiple sub-bands and sub-apertures on the basis of a three-way ultra-wide bandwidth (UWB) synthetic aperture radar (SAR) image. The specific steps of the method are as follows: 1, generating a sub-band sub-aperture image sequence; 2, generating a sub-band sub-aperture interference image sequence; 3, detecting the moving target; and 4, estimating the two-dimensional velocity of the moving target. By using the ground moving target indication and parameter estimation method provided by the invention, the moving target and a static target can be distinguished on an imaging position and a phase position; the radial velocity of the moving target can be estimated clearly; and the azimuth speed and distance speed can also be estimated.

Description

technical field [0001] The invention belongs to the technical field of synthetic aperture radar signal processing, and relates to a ground moving target detection and parameter estimation method, in particular using three-channel UWB SAR (Ultra Wide-band Synthetic Aperture Radar, ultra-wideband synthetic aperture radar) images to detect ground moving targets Detection and parameter estimation methods. Background technique [0002] UWB SAR system is an imaging radar with the ability of leaf cluster penetration and can simultaneously obtain two-dimensional high resolution. The multi-channel UWB SAR system is used to realize the GMTI (Ground Moving Target Indication, ground moving target indication) function, which can conduct reconnaissance, surveillance and imaging of stationary and moving targets in a wide open flat or leaf-covered area. On UWB SAR images, the phase difference between moving and stationary targets is used to detect moving targets. Due to the long coherent p...

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Problems solved by technology

Since the phase Δφ of the moving target changes from the distance to the velocity v y It is determined that this type of method has two shortcomings: (1) Since Δφ takes 2π as a period, even if v y is not zero, its corresponding Δφ may also be zero, and blind speed phenomenon occurs when detecting the target; in addition, different v y The corresponding Δφ may be the same, and there will be a range-velocity ambiguity problem when estimating parameters; (2) Since the phase Δφ is only related to v y Related, so this kind of method can only detect and estimate the moving target whose range velocity is not zero, but cannot detect the moving target whose range velocity is zero but the azimuth velocity is not zero, nor can it estimate the azimuth velocity of the target

The UWB SAR system has a long wavelength and requires a long baseline. Due to the limitation of the antenna size and platform size, it is very difficult to install four receiving antennas on the carrier aircraft to form an effective baseline. At the same time, the excessive number of antennas increases the hardware and storage burden. The use of multi-frequency or multi-trigger schemes also increases the complexity of the system

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