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Method for fast estimating airborne radar clutter space-time spectrum based on improved OMP

A clutter space-time spectrum, airborne radar technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as algorithm failure, and achieve the effects of small computational complexity, efficient estimation, and easy engineering implementation.

Inactive Publication Date: 2017-05-10
HOHAI UNIV
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AI Technical Summary

Problems solved by technology

OMP and its improved algorithm are suitable for the situation where the signal sparsity is known, but in practical applications, the sparsity of many signals to be reconstructed is unknown, and the above algorithms will fail at this time

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  • Method for fast estimating airborne radar clutter space-time spectrum based on improved OMP
  • Method for fast estimating airborne radar clutter space-time spectrum based on improved OMP
  • Method for fast estimating airborne radar clutter space-time spectrum based on improved OMP

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Embodiment Construction

[0029] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0030] In practical applications, the airborne radar geometric configuration is as follows figure 2 As shown, it is assumed that the radar antenna is a uniform linear array with the number of elements N, and the aircraft flies along the X-axis at a speed v, and β and α are the angles of the scatterer P relative to the antenna axis and the direction of the speed v, respectively. Consider the non-front-view array, ψ, θ, are the yaw angle, azimuth angle and pitch angle respectively, the height of the carrier aircraft is h, and the number of time-domain pulses in one coherent processing interval is I.

[0031] When N=32, ψ=30°, I=32, the ideal clutter space-time spectrum distribution trajectory is as follows image 3 As shown in , it can be seen that the clutter signals of each Doppler unit are sparsely distributed in th...

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Abstract

The invention relates to a method for fast estimating airborne radar clutter space-time spectrum based on improved OMP. For a sparseness unknown condition of a signal to be reconstructed, a designed improved OMP algorithm is used to iteratively estimate linear approximation signal sparseness so as to quickly solve the support set of the sparse signal and its the coefficient of sparse representation so as to achieve high-efficiency estimation of the airborne radar clutter space-time spectrum. The entire design method is small in amount of calculation and easy to implement.

Description

technical field [0001] The invention relates to an airborne radar clutter space-time spectrum fast estimation method based on an improved OMP, and belongs to the technical field of clutter space-time spectrum sparse reconstruction. Background technique [0002] Airborne radar sets up the radar platform at high altitude, and plays an incomparable role in target detection, battlefield surveillance, earth observation and other military and civilian fields. When the airborne radar is looking down, in addition to the target signal, there are a lot of ground clutter in the received echo signal, which will seriously affect the target detection performance of the airborne radar. Due to the relative radial motion between the carrier aircraft and the ground object scatterers, low-speed targets are often submerged in clutter and cannot be detected effectively. Therefore, the research on clutter is the main problem of airborne radar slow-moving target detection. Space-time adaptive pr...

Claims

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 沈明威纪存孝陶震张琪王冠
Owner HOHAI UNIV
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