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High-frequency surface wave radar TBD method based on polarization information
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A high-frequency ground wave radar and polarization information technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as poor detection and tracking performance, and achieve the effects of good real-time performance, improved signal-to-noise ratio, and fast processing speed
Active Publication Date: 2016-06-08
HARBIN INST OF TECH
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[0004] The present invention aims to solve the problem of poor detection and tracking performance of the currently used TBD method in high-frequency ground-wave radar under the condition of low signal-to-noise ratio, and proposes a high-frequency ground-wave radar based on polarization information TBD method
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specific Embodiment approach 1
[0024] Specific implementation mode one: as Figure 8 As shown, a high frequency ground wave radar TBD method based on polarization information includes the following steps:
[0025] Step 1: Eliminate sea clutter in each frame of echo data to obtain processable range velocity spectrum data, the range velocity spectrum data includes K frame data, 10≤K≤30;
[0026] Step 2: Perform constant false alarm pre-detection processing on the first frame data obtained in step 1 to obtain I (r,d) (1) and U 1 , I (r,d) (1) for exceeding V in the first frame cfar The stage value function of the data unit of U , U 1 is the turntable transfer area of the target in the second frame of data, r is the coordinate of the range unit, d is the coordinate of the Doppler unit; V cfar is the constant false alarm threshold, and the stage value function refers to the amplitude of the data unit;
[0027] The setting method of the constant false alarm threshold is as follows: for the nth range unit ...
specific Embodiment approach 2
[0032] Specific embodiment two: the difference between this embodiment and specific embodiment one is: obtain I in the described step two (r,d) (1) and U 1 The specific process is:
[0033] When k=1, all data units of the first frame data are carried out CFAR pre-detection processing, and the stage value function record of the data units exceeding the CFAR threshold is recorded as I (r,d) (1), namely:
[0034] I (r,d) (1)=z (r,d) (1) {when z (r,d) (1)>V cfar}(1)
[0035] where z (r,d) is the magnitude of the r-th range unit and the d-th Doppler unit in the velocity-range spectrum, V cfar is the constant false alarm detection threshold;
[0036] U k = Z k + 1 ( r ...
specific Embodiment approach 3
[0039] Specific implementation mode three: the difference between this implementation mode and specific implementation mode one or two is: obtain I in the described step three (r,d) (2) and U 2 The specific process is:
[0040] When k=2, for the second frame data target state transition area U 1 All data units within the range are subjected to CFAR pre-detection processing, and if all data do not exceed the CFAR threshold, the I (r,d) (1), otherwise the accumulation calculation is carried out to obtain I (r,d) (2);
[0041] I ( r , d ) ( 2 ) = I ( r , d ) ( 1 ) + m a x ...
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Abstract
The invention relates to a high-frequency surface waveradar TBD method based on polarization information. The method is used for settling problems of relatively detecting performance and relatively low tracking performance in a currently utilized TBD method in a high-frequency surface waveradar. The method comprises the following steps of a first step, eliminating a sea clutter in each echo data frame, thereby obtaining distance speed spectrum data which can be processed; a second step, performing constant false alarm detection on a first data frame obtained in the first step, thereby obtaining I(r,d)(1) and U1; a third step, obtaining I(r,d)(2) and U2 according to the second step; a forth step, obtaining I(r,d)(3) and U3 according to the third step; and a fifth step, performing iteration and executing the fourth step for (K-3) times until I(r,d)(K) is obtained, and obtaining the track of the target according to the I(r,d)(K). The high-frequency surface waveradar TBD method is applied in the field of high-frequency surface wave radar target detection and tracking.
Description
technical field [0001] The invention relates to a high frequency ground wave radar TBD method based on polarization information. Background technique [0002] In the application of high-frequency ground wave radar, the external noise is very strong, including short-wave radio interference, first-order second-order spectrum, atmospheric noise, etc. Compared with the target echo intensity is very weak, the signal-to-noise ratio is low, even through two-dimensional phase After the accumulation of parameters, it still cannot be reliably detected to form a weak target. Early radar systems generally adopt the method of detecting first and tracking later to realize target detection and tracking. The detection is completed in the radar signal processing part, that is, the clutter and noise are firstly suppressed, and then compared with the detection threshold to complete the constant false alarm detection, and the tracking is completed in the radar data processing part. Track init...
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