Fitting interferometric phase false alarm removal method
A technology of interference phase and false alarm rejection, applied in radio wave measurement systems, instruments, etc., can solve problems such as interference and constant false alarm detection interference, and achieve the effects of improving detection performance, reducing false alarm rate, and wide applicability
Active Publication Date: 2015-03-04
XIDIAN UNIV
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Problems solved by technology
The constant false alarm detection method will inevitably be affected by clutter. In addition to the interference caused by the main lobe clutter to the moving target detection, the clutter in the side lobe irradiation area of the radar antenna and the side lobe isolated point clutter will both affect the constant false alarm. Detection causes a certain degree of interference
Constant false alarm moving target detection method mainly judges whether it is a target based on the output power level. This single judgment criterion will produce many false alarms in the case of strong ground non-uniformity and high antenna side lobes.
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[0023] The present invention will be further described below in conjunction with accompanying drawing:
[0024] refer to figure 1 , is a flow chart of the false alarm elimination method of the fitted interference phase of the present invention. The false alarm elimination method of the fitted interferometric phase comprises the following steps:
[0025] Step 1, use the airborne wide-area scanning GMTI radar system to receive the echo signal, and the echo signal received by the airborne wide-area scanning GMTI radar system is denoted as x.
[0026] The specific steps are:
[0027] The airborne wide-area scanning GMTI radar system is used to transmit signals outward, and the airborne wide-area scanning GMTI radar system is used to receive echo signals; the airborne wide-area scanning GMTI radar system has two receiving channels, and the airborne wide-area scanning GMTI radar system The echo signal received by the first receiving channel Rx1 is denoted as x 1 , the echo signa...
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The invention belongs to the technical field of radar false alarm detection and relates to a fitting interferometric phase false alarm removal method. The fitting interferometric phase false alarm removal method comprises the following steps of receiving an echo signal through a vehicle-mounted wide-area GMTI radar system and obtaining a signal x (r,fd) of a distance Doppler domain which is corresponding to the echo signal received by the vehicle-mounted wide-area scanning GMTI radar system; sequentially performing clutter suppression and unit average constant false alarm detection processing on the x (r,fd), obtaining Doppler domain echo signals of N moving targets and obtaining an interferometric phase phi of the n suspected moving target; obtaining an interferometric phase fitting value which is corresponding to the n suspected moving target, setting a false alarm threshold and judging a size relationship between a following formula and the false alarm threshold, wherein |.| stands for an absolute value; identifying the n suspected moving target to be a false alarm if the following formula is smaller than or equal to the false alarm threshold; identifying the n suspected moving target to be a target if not.
Description
technical field [0001] The invention belongs to the technical field of radar false alarm detection, and relates to an airborne wide-area scanning GMTI (Ground Moving Target Indication, ground moving target detection) radar system false alarm elimination method, specifically a knowledge-assisted fitting interference phase A false alarm rejection method is used to improve the detection performance of moving targets. Background technique [0002] The airborne wide-area scanning GMTI radar system can not only complete the observation of large scenes, obtain high-quality DBS (Doppler Beam Sharpening, Doppler Beam Sharpening) images, and find valuable stationary targets, but also has excellent dynamic Object detection and localization capabilities. [0003] Usually, DBS imaging uses the echo information of the ground fixed scene, and the ground clutter needs to be suppressed in the process of moving target detection, so that the moving target information can be preserved. The mo...
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IPC IPC(8): G01S7/41
CPCG01S7/415
Inventor 王彤鲁缘政吴建新
Owner XIDIAN UNIV