High-resolution radar dual-threshold detector based on energy accumulation

Abstract

The invention discloses a high-resolution radar dual-threshold detector based on energy accumulation, belonging to the field of signal processing. Values of all distance units in a distance window, passing through a square-law detector, are compared with a first threshold, quantity and positions a target scattering center are extracted, then energy of the scattering centers is accumulated and compared with a second threshold to obtain a final detection judgment. Compared with the traditional detection, the detector deduces a calculation formula of the threshold to ensure that actual application is more convenience and flexible, is simple in form, is easy to engineering realization, and has better robustness and detection property under the condition of unknown distribution of the scattering centers.

Description

technical field [0001] The invention relates to a high-resolution radar detection method, which is especially suitable for the constant false alarm detection of a range-extended target by a high-resolution radar under the condition that the scattering characteristics of the target are unknown, and belongs to the technical field of signal processing. Background technique [0002] With the development and progress of radar technology, in addition to the detection and tracking of targets, modern radars also require the ability to classify and identify target types. Traditional low-resolution radars are difficult to provide more target structure information, so high-range resolution radars with large bandwidths have become one of the important research directions in the radar field. [0003] When using high-resolution radar for detection, the range resolution unit is smaller or even much smaller than the target size, so the target will occupy several, a dozen or even dozens of r...

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Problems solved by technology

[0032] Although the SDD-GLRT detector has certain robustness under the condition that there is a slight mismatch in the number of estimated scattering points, this method is the optimal detection in the sense of statistical average, and there is an exponential operation, which is not easy to implement in engineering, and there is no threshold The selection formula of , the practical application is limited

[0033] To sum up, in the existing detectors, when the energy accumulation method is used to detect the scattering target, there will be a problem of poor detection performance due to the accumulation loss caused by the inappropriate selection of the distance window; When , there will be the problem of quantization error due to the uniform distribution of the target scattering center or the inappropriate selection of the second threshold, which will eventually lead to the defect of poor detection performance; In SDD-GLRT, there is a problem that the practical application is limited due to the lack of a threshold selection formula and the large amount of calculation.

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