A method for detecting and eliminating radar system noise

Abstract

The present invention provides a method for detecting and eliminating radar system noise, belonging to the field of radar detection. Specifically, for the radar working area to be detected or monitored, first, for the i-th system noise n of the current radar i , it appears at different positions at n consecutive different times; similarly, the system noise n of the current radar j , it appears at different positions at n consecutive different times; and so on; then, for each position, all the system noises that appear at this position during this time period are superimposed to form a three-dimensional point cloud and marked as a three-dimensional stereogram; finally, looking down at the three-dimensional stereogram to obtain the law of the positions where the radar system noise appears, screening the position areas where the superimposed system noise is greater than the threshold, shielding the radar signals in this area, and selecting other areas as the working area of the radar; The invention is simple to implement, intuitive, has a low cost, and saves time.

Description

Technical Field

[0001] The present invention belongs to the field of radar detection, and particularly relates to a method for detecting and eliminating radar system noise. Background Art

[0002] Radar noise can increase the false alarm rate, reduce the detection accuracy, and even lead to the failure of target detection. With the expansion of the application scope of radar detection technology, it has become an urgent task to quickly detect and remove radar noise.

[0003] Radar noise is generally divided into two types: random noise and system noise. The reasons for the generation of random noise are relatively diverse, and it generally appears randomly at different positions; the generation of system noise is generally related to circuit design, manufacturing materials, component dimensions, and application scenarios, and its appearance position has a certain regularity.

[0004] In order to remove or reduce the system noise of radar signals and detect targets more accurately, it is generally achieved by redesigning the circuit, replacing manufacturing materials, swapping components, adjusting the scene position, or adjusting radar circuit parameters, etc.; specifically:

[0005] 1. According to the design defects of the radar circuit, modify the circuit design to reduce or eliminate the radar noise generated by the circuit.

[0006] 2. Replace some materials in the circuit, such as changing the material of wires from copper to gold, silver, etc., or replacing the radome, radar base, etc. with materials of higher purity.

[0007] 3. Different electronic components in the radar, that is, the quality, size, etc. of the electronic components will generate radar noise; adopting or replacing high-quality electronic components can reduce or eliminate some radar noise.

[0008] 4. Different radar usage scenarios will generate different reflection, scattering, etc. noises. By adjusting the application scenario and eliminating the conditions for generating reflection, scattering, etc., some reflection, scattering, etc. noises can be eliminated.

[0009] 5. Adjust the radar circuit parameters, such as reducing the radar power, which can effectively reduce or eliminate some radar noise.

[0010] However, the new design solutions, whether it is redesigning the circuit, replacing manufacturing materials, swapping components, or adjusting the scene position, adjusting radar circuit parameters, etc., have obvious disadvantages, mainly including:

[0011] 1. The design and production time is relatively long; whether it is redesigning the circuit, replacing manufacturing materials, or modifying component dimensions, it is equivalent to redesigning the radar during the implementation process, and the time consumed is generally long.

[0012] 2. The production and manufacturing cost increases; the design and manufacture of the radar require professional technicians, professional equipment, and special materials. Every adjustment of the design scheme will cause a significant increase in costs.

[0013] 3. The new design scheme will generate new noise; generally, the application of new circuits and materials will generate new noise. Therefore, even if the adjustment of the design scheme can eliminate the original noise, it is necessary to consider how to eliminate the new noise.

[0014] 4. Adjusting the radar parameters will reduce the detection accuracy; generally, adjusting the radar parameters, such as reducing the radar power, can reduce or even eliminate some system noise; but while the noise is reduced, the detection accuracy of the radar will also decrease, especially the reduction of the radar detection range.

[0015] In a sense, radar noise is inevitable. If the occurrence law of the radar system noise is mastered, its occurrence position is determined, the radar signals in this area are discarded, and other areas with extremely low system noise are selected as the working area, the radar can meet the detection requirements. Summary of the Invention

[0016] In view of the above problems, the present invention proposes a method for detecting and eliminating radar system noise, which can quickly judge the occurrence law of the system noise, determine the occurrence position of the system noise, and then complete the calibration of the radar working area, realizing the rapid detection and elimination of radar noise.

[0017] The method for detecting and eliminating radar system noise is specifically as follows:

[0018] For the radar working area to be detected or monitored, for the i-th system noise n i of the current radar, it appears at different positions at n consecutive different times; at time t 1 the position where the system noise n i appears is (x 1 , y 1 ), that is, n i = f ti (x 1 , y 1 ); at time t 2 the position where the system noise n i appears is (x 2 , y 2 ), that is, n i = f ti (x 2 , y 2 ); and so on.

[0019] Similarly, for the system noise n j of the current radar, it appears at different positions at n consecutive different times;

[0020] At time t 1 The system noise n j appears at the position (x 1 , y 1 ), that is, n j = f tj (x 1 , y 1 );

[0021] For the system noise n of the current radar l , it appears at different positions at n consecutive different times;

[0022] And so on;

[0023] Then, for each position, all the system noises n that appear at this position at n different times i , n j and n l etc. are superimposed; all the superimposed system noises at different positions at different times form a three-dimensional point cloud, which is marked as a three-dimensional stereogram;

[0024] Finally, looking down at the three-dimensional stereogram to obtain the law of the positions where the system noises of the radar appear, screening the position areas where the superimposed system noises are greater than the threshold, shielding the radar signals in this area, and selecting other areas as the working area of the radar.

[0025] The range of the threshold is set artificially according to the actual environment.

[0026] Furthermore, the present invention uses the direct superposition of the radar test signals in the open area to replace the top view of the three-dimensional stereoscopic point cloud to calibrate the influence positions of the system noise.

[0027] The advantages of the present invention are as follows:

[0028] A method for detecting and eliminating the system noise of a radar can quickly judge the law of the appearance of the system noise and determine the position where the system noise appears; it is simple to implement, intuitive, has a low cost, and saves time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a flowchart of a method for detecting and eliminating the system noise of a radar according to the present invention;

[0030] Figure 2 is a division diagram of the radar scanning area disclosed by the present invention;

[0031] Figure 3 is a radar system noise diagram at different times according to the present invention;

[0032] Figure 4 is a three-dimensional stereogram of the superimposed signal at a single position according to the present invention;

[0033] Figure 5 Side view of the present invention for superimposing signals at a single location;

[0034] Figure 6 Top view of the present invention for superimposing signals at a single location. Detailed implementation manners

[0035] The following makes a specific description of specific embodiments of the present invention according to the accompanying drawings.

[0036] In a real scenario, the radar working area to be detected or monitored is fixed. Generally, the system noise of the radar signal is eliminated or reduced by reducing the noise in the radar working area; if a radar scanning area with less noise is selected to cover the area to be detected or monitored, such as Figure 1 the gray area shown, it can also meet the working requirements. In a sense, the effect of this method is equivalent to eliminating or reducing the system noise of the radar.

[0037] A method for detecting and eliminating radar system noise of the present invention determines the law of the position where the radar system noise appears, and then calibrates the position of the system noise, such as Figure 1 the black dot area shown; then shield the radar signals in this area, and select other areas with less system noise as the working area; the present invention can quickly judge the law of the appearance of system noise and determine the position where the system noise appears.

[0038] The method for detecting and eliminating radar system noise as described above, as Figure 2 shown, the specific steps are as follows:

[0039] Step 1: For the radar working area to be detected or monitored, the radar starts scanning;

[0040] Step 2: For the i-th system noise n i of the current radar, mark different moments within a continuous time period, and mark the different positions where the noise n i appears in its scanning area;

[0041] At time t 1 , assuming the position where the system noise n i appears is (x 1 , y 1 ), then n i can be expressed as: n i = f ti (x 1 , y 1 );

[0042] At time t 2 , the position where the system noise n i appears is (x2 , y 2 ), that is, n i = f ti (x 2 , y 2 ); and so on.

[0043] Step 3: Similarly, for the remaining system noises of the current radar, mark the different positions where each system noise appears at different times within this time period;

[0044] Step 4: For each position, superimpose all the system noises that appear at this position within this time period;

[0045] The calculation formula for the superimposed system noise with the position coordinates (x, y) is:

[0046] n = f t1 (x, y) + f t2 (x, y) +... + f tn (x, y)

[0047] Step 5: Similarly, calculate the superimposed system noises corresponding to all positions respectively to form a three-dimensional point cloud and mark it as a three-dimensional stereogram;

[0048] As Figure 3 shown, record the radar test data in an open area. Since there is no target, the test data only contains the system noise of the radar; however, it is difficult to calibrate other areas with less system noise by only examining a small amount of radar test data.

[0049] Step 6: Look down at the three-dimensional stereogram to obtain the pattern of the positions where the radar system noise appears, screen the position areas where the superimposed system noise is greater than the threshold, shield the radar signals in this area, and select other areas as the working area of the radar.

[0050] The range of the threshold is set artificially according to the actual environment.

[0051] By excluding the positions where the superimposed system noise is greater than the threshold, the areas with less system noise can be calibrated to determine the working area of the radar.

[0052] As Figure 4 , 5 and 6 show, by looking down at the superimposed radar signals, that is, the three-dimensional point cloud, the influence range of the system noise can be easily determined; then, by excluding the areas affected by the system noise, the working area of the radar can be calibrated.

[0053] The present invention can also be implemented by directly superimposing the radar test signals in the open area, rather than by selecting the top view of the three-dimensional stereoscopic point cloud.

Claims

1. A method for detecting and eliminating radar system noise, characterized in that, the specific steps are as follows: For the radar working area to be detected or monitored, for the i-th system noise n of the current radar i , it appears at different positions at n different times; at time t 1 , let the position where the system noise n i appears be (x 1 , y 1 ), then n i is expressed as: n i = f ti (x 1 , y 1 ); Similarly, for the system noise n of the current radar j , it appears at different positions at n consecutive different times respectively; Then, for each position, all system noises that appear at this position at n different times are superimposed to form a three-dimensional point cloud, which is marked as a three-dimensional stereogram; Finally, look down at the three-dimensional stereogram to obtain the law of the positions where each system noise of the radar appears, screen the position areas where the superimposed system noise is greater than the threshold, shield the radar signals in this area, and select other areas as the working area of the radar.

2. A method for detecting and eliminating radar system noise according to claim 1, characterized in that, the calculation formula for superimposing system noise with the position coordinates (x, y) is: n = f t1 (x, y) + f t2 (x, y) +... + f tn (x, y) f tn (x, y) represents the system noise value that appears at the position with coordinates (x, y) at the nth moment.

3. A method for detecting and eliminating radar system noise according to claim 1, characterized in that, the range of the threshold is set artificially according to the actual environment.

4. A method for detecting and eliminating radar system noise according to claim 1, characterized in that, the top view of the three-dimensional stereoscopic point cloud is replaced by directly superimposing the radar test signals in the open area, which is used to calibrate the influence positions of the system noise.

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