Method for detecting offshore non-navigational state ship target by using high-frequency ground wave radar
A high-frequency ground wave radar, non-navigational technology, applied in the direction of using re-radiation, radio wave measurement system, radio wave reflection/re-radiation, etc., can solve the problem of reducing the performance of high-frequency ground wave radar ship target detection and affecting ship targets Problems such as tracking and monitoring results, failure to give target detection results of ships in non-course state, etc.
Inactive Publication Date: 2013-09-18
THE FIRST INST OF OCEANOGRAPHY SOA
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If there is no ship target detection in the non-navigation state, not only the detection results of the ship target in the non-course state cannot be given, but also the detection of the temporary non-navigation state that the target may be in during maneuvering motion will affect the tracking and monitoring results of the ship target. Reduced HF SWR ship target detection performance
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[0036] Below in conjunction with accompanying drawing, method of the present invention is described further:
[0037] Such as figure 1 As shown, the method of using high-frequency ground wave radar to detect non-navigation ship targets at sea mainly includes determining the target distance and position based on zero-Doppler information, and using multi-time echo signal statistical analysis to eliminate island information. The specific steps are as follows:
[0038] Step 1: Use a certain time t 0 The high-frequency ground wave radar multi-channel data to extract the zero-Doppler information, that is, the range-beam data (R-B data) at zero-Doppler, denoted as Y r,b, its physical quantity is the amplitude value, the unit is dB; the distance-beam data, that is, the R-B data is a two-dimensional data, and its form is as follows figure 2 shown;
[0039] Step 2: Integrate all the beam data of the same distance cell r, that is, add the data along the azimuth direction to form a on...
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The invention discloses a method for detecting offshore non-navigational state ship target by using high-frequency ground wave radar. The method comprises the steps of: extracting zero Doppler information by using multichannel data of the high-frequency ground wave radar; performing integral processing on all wave packet data of a same distance cell to obtain one-dimensional data; performing constant false alarm rate detection to determine the distance cells with suspicious targets; performing peak detection on each distance with the suspicious target along the azimuth at the distance; discovering the position where the maximum value occurs in the azimuth to determine the azimuth where the suspicious target is positioned; selecting echo signals of a plurality of moments to perform statistical analysis; removing island targets in the suspicious targets; and finally recognizing the non-navigational state ship target. According to the method, the zero Doppler information is utilized, the characteristic that the echo signal with stronger target is extended in beam forming along the azimuth and the variation difference of the ship at different moments and island and land clutter echo intensity are comprehensively considered, and the defect that only the offshore moving target can be detected but the non-navigational state ship target cannot be detected existing in the prior art is overcome.
Description
technical field [0001] The invention relates to a method for detecting a ship target in a non-navigation state at sea, in particular to a method for detecting a ship target in a non-navigation state at sea by using a high-frequency ground wave radar. Background technique [0002] High-frequency ground wave radar can detect moving ship targets on the sea. The principle is that the radial movement of the moving ship on the sea relative to the radar station will cause Doppler frequency shift. High-frequency ground wave radar detects non-zero Doppler frequency shift. Detect moving targets at sea and realize dynamic tracking and detection of moving targets. [0003] At present, a variety of high-frequency surface wave radar target detection methods have been developed at home and abroad (Dzvonkovskaya1 et al, 2008; Maresca, et al, 2011). In the above detection methods, the non-zero Doppler frequency information in ground wave radar data is mainly used, and the zero-Doppler infor...
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Inventor 纪永刚张杰王祎鸣郑进鸿刘敬喜张德玉梁军汀卢杰
Owner THE FIRST INST OF OCEANOGRAPHY SOA