An Adaptive Reconstruction Method for Splitting of Radar Target Echo Azimuth Sidelobe Display

Abstract

The present invention discloses an adaptive recontinuation method for radar target echo azimuth sidelobe display splitting, wherein the radar echo data azimuth interval is determined according to radar working parameters, and a multi-period storage matrix of radar echo data is constructed, and the azimuth data period required for compensating the target display splitting in each interval is determined according to the distance gradient interval, and a P display image storage matrix is ​​formed by adaptively superimposing and mapping the multi-period data, and finally the P display image data is drawn to realize the smooth display of the long-distance target echo under the radar P display large range. The present invention utilizes the data correlation of the adjacent periods of the radar target echo, replaces the interpolation algorithm used in the past when the echo azimuth data is sparse with real scanning data, directly obtains the P display image storage matrix through the superimposition mapping of multi-period echo data, and adaptively selects the number of echo data periods participating in the superimposition mapping according to the distance gradient interval division under different ranges, and improves the display fluency by reducing the calculation amount of the echo data mapping.

Description

Technical Field

[0001] The invention belongs to the field of radar display, and in particular relates to an adaptive recontinuation method for splitting radar target echo azimuth sidelobe display. Background Art

[0002] The radar's P display image is a quantitative drawing of the echo amplitude at the radar detection azimuth and distance in the polar coordinate system. In computer graphics implementation, it is expressed as color filling of screen pixels in the Cartesian coordinate system in a display area of ​​a set size. In order to display a single-frame echo image of the radar, the plane position echo amplitude value stored with azimuth and distance as independent variables needs to be mapped to the corresponding pixel color quantization value of the P display drawing area in Cartesian coordinates. Under normal circumstances, the P display image can be considered as a screen area with a radius of R pixels, which is used to display the radar echo bitmap in the detection area with a scanning range covering 0~360° and a distance upper limit of the radar power range.

[0003] The mapping method between radar echo data and P-display images mainly used point-by-point drawing under coordinate transformation in the early stage, and then gradually introduced the echo storage matrix to map the single-point pixel coordinates, and used the overall mapping method to replace point-by-point drawing. However, no matter which mapping method is used, if the radar P-display is a screen area of ​​fixed size, the actual physical plane size corresponding to the single pixel point of the drawing area under different ranges, and the number of screen pixels corresponding to the target echo at different distances drawn in the P-display area are inconsistent.

[0004] In general, based on the characteristic parameters such as the echo azimuth interval given by the radar and the fixed size of the P display drawing area, for targets with the same physical characteristics, the farther away from the coordinate origin, the larger the tangential width extended in azimuth, and more screen pixels are needed to draw the target. Therefore, when a smaller display range is selected, since the actual physical plane represented by a single pixel is smaller, the number of azimuth data that can be obtained for targets with the same azimuth sidelobe width within the range will be greater than the number of pixels required for azimuth sidelobe display, so that it can be mapped to fill enough drawing pixels to complete continuous display; and when the display range exceeds half of the radar power range, the larger the selected display range, the closer the target is to the range boundary under the current range, that is, the farther the target is, the larger the tangential width extended in azimuth. At this time, if the echo data is sparse in azimuth, it will not be mapped to enough drawing pixels, and the target echo azimuth sidelobe display will be split, which will increase the difficulty of effectively distinguishing the target and accurately recording.

[0005] The matching error caused by the loss of precision when the echo data is transformed into coordinates will further aggravate the display splitting of the distant target echo. When the echo detection threshold is too high, the azimuth and distance sidelobe widths of the target will be reduced. If the sidelobe width of the target is smaller than the single-pixel distance size under the current range, the target echo will be lost in the display. In the face of such problems, the existing technology can reduce the azimuth data interval by increasing the sampling rate of the echo data, or use display preprocessing to perform interpolation operations to fill the echo data to meet the needs of smooth drawing of the P display. However, when the physical characteristics or hardware environment of the radar cannot be adjusted, a wider range of technical solutions needs to be provided. Summary of the invention

[0006] In view of the above problems, the purpose of the present invention is to provide an adaptive continuation method for the splitting of the azimuth sidelobe display of radar target echo. By calculating the number of azimuth sidelobe display pixels of the target echo at different ranges, a multi-period storage matrix of radar echo data is constructed, and the multi-period echo data is adaptively superimposed and mapped to form a P-display image storage matrix. The breakpoints of long-distance target echoes at the radar P-display large range are smoothly drawn by breakpoint continuation, thereby improving the observability and operability of the target echo.

[0007] The specific technical solution for achieving the purpose of the present invention is:

[0008] An adaptive recontinuation method for radar target echo azimuth sidelobe display splitting comprises the following steps:

[0009] Step 1: Determine the radar echo data azimuth interval according to the radar operating parameters ;

[0010] Step 2, construct a multi-period storage matrix of radar echo data;

[0011] Step 3, determining the azimuth data period required for compensating for target display splitting in each interval according to the range gradient interval, and forming a P display image storage matrix by adaptively superimposing and mapping multi-period data;

[0012] Step 4: Draw the P display image data to achieve smooth display of long-distance target echoes under the radar P display large range.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The solution of the present invention utilizes the data correlation of adjacent cycles of radar target echoes, replaces the interpolation algorithm used in the past when echo azimuth data is sparse with real scanning data, and directly obtains the P display image storage matrix through multi-cycle echo data superposition mapping;

[0015] And under different ranges, the number of echo data cycles participating in the superposition mapping is adaptively selected according to the distance gradient interval division, which improves the display fluency by reducing the amount of echo data mapping calculation;

[0016] At the same time, by using a shared target echo multi-period storage matrix and attenuating the amplitude of the echo data, the radar video afterglow display effect can also be achieved.

[0017] The present invention is further described below in conjunction with specific implementation modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the principle of the adaptive recontinuation method of the radar target echo azimuth sidelobe display splitting of the present invention.

[0019] Figure 2 It is a schematic flow chart of an adaptive recontinuation method for radar target echo azimuth sidelobe display splitting according to the present invention.

[0020] Figure 3 A schematic diagram of pixels drawn for target echoes at different distance gradient intervals at the maximum range of the P display in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] Example

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an kind" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0024] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0025] Combination Figure 1 and Figure 2 , an adaptive recontinuation method for radar target echo azimuth sidelobe display splitting, comprising the following steps:

[0026] Step 1: Determine the radar echo data azimuth interval according to the radar operating parameters , radar echo data is a set of echo amplitude values ​​recorded with azimuth and distance as independent variables; the azimuth interval of echo data sent out during radar detection is related to characteristic parameters such as radar repetition period, antenna rotation number and pulse accumulation number:

[0027] (1)

[0028] in, Indicates the radar repetition period; Indicates the accumulated number of pulses; Indicates the number of revolutions of the radar antenna;

[0029] In this embodiment, according to formula (1), if the radar rotation speed is 30° / s, the upper limit of the radar repetition period is 2000us, and 5 pulses are accumulated, the echo data azimuth interval can be obtained: It is 0.3°.

[0030] Step 2: Construct a multi-period storage matrix of radar echo data, which is a matrix with a width of , height is , the number of cycles is The three-dimensional storage matrix: E[M][N][ ];

[0031] Where, E[a][b][c] represents the radar echo amplitude value at the a-th azimuth grid, the b-th distance grid, and the c-th period, a∈[0,M-1], b∈[0,N-1], c∈[0, -1], The width of the echo data storage matrix, indicating the total number of azimuth storage cells; The height of the matrix storing the echo data represents the total number of distance cells; The maximum range corresponds to value, Indicates the number of cycles of the echo data storage matrix under the i-th display range;

[0032] In this embodiment, the width M of the echo data storage matrix and the height N of the echo data storage matrix are respectively:

[0033]

[0034]

[0035] in, Indicates the radar scanning azimuth range. Indicates the size of the location storage cell. Indicates the radar power range. Indicates the echo data distance unit value, Indicates that the azimuth storage cell size only needs to be larger than the echo data azimuth interval The minimum value of .

[0036] Combination Figure 3 As shown, the radar P displays an image with a radius of The screen area of ​​pixels is used to draw the scanning range covering 0~360°, and the maximum range is the radar power range The echo bitmap within the detection area. In polar coordinates, the echo azimuth sidelobe width is For target A, as the distance increases, the tangential width extending in azimuth becomes larger, and the display width of the azimuth sidelobe, that is, the number of pixels displayed in the azimuth sidelobe, also becomes larger.

[0037] In this embodiment, Figure 3 As shown, if the radar power range 480 km, P shows the radius of the drawing area If the azimuth sidelobe width θ of target A echo is known to be 3°, the number of pixels displayed by the azimuth sidelobe of the target echo at each range can be calculated: , the calculation formula is:3

[0038]

[0039] In this embodiment, it can be obtained from formula (2) that the number of pixels displayed in the azimuth sidelobe of the target echo with an azimuth sidelobe width θ of 3° at different display range boundaries is The rounding approximation is shown in Table 1 below. When T=6, i∈[1,6].

[0040]

[0041] Table 1

[0042] From the above content, we can see that

[0043] Based on the characteristic parameters such as the echo azimuth interval given by the radar and the fixed size of the P display drawing area, for targets with the same physical characteristics, the farther away from the coordinate origin, the larger the tangential width extended in azimuth, and more screen pixels are required to draw the target.

[0044] When the radar echo azimuth interval is fixed, the number of azimuth data G that can be obtained within the target azimuth sidelobe width θ is determined, and its calculation formula is:

[0045]

[0046] In this embodiment, it is assumed that the target azimuth sidelobe width θ is 3°. The angle is 0.3°, so 10 azimuth data can be obtained for this target in a single cycle.

[0047] When a smaller display range is selected, since the actual physical plane represented by a single pixel is smaller, the number of azimuth data that can be obtained for targets with the same azimuth sidelobe width within the range will be greater than the number of pixels required for azimuth sidelobe display, so that sufficient drawing pixels can be mapped to complete continuous display;

[0048] When the display range exceeds half of the radar power range, the larger the selected display range, the closer the target is to the range boundary under the current range, that is, the farther the target is, the larger the tangential width extended in azimuth.

[0049] At this time, if the number of azimuth data G is less than the number of pixels displayed in the azimuth sidelobe in the i-th range , which will result in insufficient mapping to the drawing pixels, and the target echo azimuth sidelobe display will be split, making it more difficult to effectively identify the target and accurately record. To solve this problem, the echo data can be accumulated and stored over multiple cycles, and the target azimuth data can be increased to obtain the display pixels required for smooth drawing.

[0050] The number of cycles of the echo data storage matrix for each display range for:

[0051]

[0052] In the above formula, represents the number of pixels displayed in the azimuth sidelobe under the i-th range, i∈[1,T], T is the total number of display ranges, Indicates P apparent radius; Indicates that the target echo azimuth sidelobe is broadened; Indicates the display range, the typical value is =30, =60, =120, =240, =360, =480, unit km; i∈[1,T], when T=6, i∈[1,6]; Indicates the number of position data. Indicates the echo data azimuth interval; Indicates the radar power range. Indicates the radar repetition period; Indicates the accumulated number of pulses; Indicates the number of revolutions of the radar antenna.

[0053] After constructing a multi-period storage matrix of radar echo data, the echo data is accumulated and stored in multiple periods and filled into the multi-period storage matrix respectively.

[0054] In this embodiment, the number of cycles of the echo data storage matrix under each display range is shown in Table 2.

[0055]

[0056] Table 2

[0057] Step 3: Determine the azimuth data period required to compensate for target display splitting in each interval according to the range gradient interval, and form a P display image storage matrix using multi-period data adaptive overlay mapping:

[0058] Further analysis from Table 2 shows that when =1, indicating that under the display quantity program number i, the number of echo azimuth data stored in a single cycle scan is equal to the number of drawing pixels required for the azimuth sidelobe widening display. At this time, the data of the first cycle in the echo data storage matrix participates in the coordinate mapping to the P display image storage matrix, which just achieves the target smooth display drawing effect.

[0059] exist = 1, the critical distance for the target sidelobe to show splitting can be obtained , the number of echo azimuth data stored in a single cycle scan will not meet the requirement of the number of pixels to be drawn. First, determine the critical distance at which the target sidelobe display splits. :

[0060]

[0061] According to the currently selected display range and critical distance By comparison, the number of data cycles in the position divided by the distance gradient interval is determined, and the corresponding data of the multi-cycle storage matrix is ​​extracted according to the number of cycles, and the multi-cycle data is adaptively superimposed and mapped to form a P-display image storage matrix.

[0062] Specifically, to ensure that the critical distance is exceeded at each range The target echo is displayed smoothly, and the number of azimuth data cycles can be calculated by dividing the currently selected range and distance gradient interval. , that is, according to the currently selected display range and critical distance Compare and determine the distance gradient interval division:

[0063] Get the critical distance that the currently selected display range is not greater than the target sidelobe display split The displayed amount program number , where i is the quantity program number, i∈[1,T];

[0064] When the selected display quantity program number i≤ When the total number of range gradient intervals S=1, the number of azimuth data cycles participating in the stacking mapping of the full range is is 1, where i is the quantity program number, i∈[1,T], and j is the distance interval number, j∈[1,S];

[0065] When the display quantity program number i is selected> When the total number of distance gradient intervals S= , then the number of azimuth data cycles in each distance interval participating in the superposition mapping is Take the distance interval number j; where i is the quantity program number, i∈[1,T], j is the distance interval number, j∈[1, ].

[0066] In this embodiment, the number of azimuth data cycles participating in the mapping algorithm under the selected range and distance gradient interval division is The values ​​of are shown in Table 3. Where i is the measurement program number, i∈[1,T], j is the distance gradient interval number under the measurement range, j∈[1,S]:

[0067]

[0068] Table 3

[0069] Step 4: Draw the P display image data to achieve smooth display of long-distance target echoes under the radar P display large range.

[0070] According to the selected display range, the periodic data association calculation under the corresponding distance interval division is adaptively called to improve the efficiency of obtaining the radar P display storage matrix; then, based on the obtained P display image matrix data, the smooth display effect of long-distance target echo under the radar P display large range is achieved.

[0071] This scheme utilizes the data correlation of adjacent cycles of radar target echoes and replaces the interpolation algorithm used in the past when the echo azimuth data is sparse with real scanning data. The P-display image storage matrix is ​​directly obtained through multi-cycle echo data superposition mapping. Under different ranges, the number of echo data cycles participating in the superposition mapping is adaptively selected according to the distance gradient interval division. The display fluency is improved by reducing the calculation amount of echo data mapping. By sharing the constructed target echo multi-cycle storage matrix and attenuating the amplitude of the echo data, the radar video afterglow display effect can also be achieved.

[0072] The present invention also provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the following steps when executing the computer program:

[0073] Step 1: Determine the radar echo data azimuth interval according to the radar operating parameters ;

[0074] Step 2, construct a multi-period storage matrix of radar echo data;

[0075] Step 3, determining the azimuth data period required for compensating for target display splitting in each interval according to the range gradient interval, and forming a P display image storage matrix by adaptively superimposing and mapping multi-period data;

[0076] Step 4: Draw the P display image data to achieve smooth display of long-distance target echoes under the radar P display large range.

[0077] The present invention also provides a computer storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the following steps are implemented:

[0078] Step 1: Determine the radar echo data azimuth interval according to the radar operating parameters ;

[0079] Step 2, construct a multi-period storage matrix of radar echo data;

[0080] Step 3, determining the azimuth data period required for compensating for target display splitting in each interval according to the range gradient interval, and forming a P display image storage matrix by adaptively superimposing and mapping multi-period data;

[0081] Step 4: Draw the P display image data to achieve smooth display of long-distance target echoes under the radar P display large range.

[0082] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. An adaptive recontinuation method for radar target echo azimuth sidelobe display splitting, characterized in that: The following steps are involved: Step 1: Determine the radar echo data azimuth interval according to the radar operating parameters ; Step 2, construct a multi-period storage matrix of radar echo data; The multi-period storage matrix of the radar echo data has a width of , height is , the number of cycles is The three-dimensional storage matrix: E[M][N][ ]; Where, E[a][b][c] represents the radar echo amplitude value at the a-th azimuth grid, the b-th distance grid, and the c-th period, a∈[0,M-1], b∈[0,N-1], c∈[0, -1], The width of the echo data storage matrix, indicating the total number of azimuth storage cells; The height of the matrix storing the echo data, which represents the total number of distance cells; The maximum range corresponds to value, Indicates the number of cycles of the echo data storage matrix under the i-th display range; The number of cycles of the echo data storage matrix under the i-th display range for: ； ； ； ； in, represents the number of pixels displayed in the azimuth sidelobe under the i-th range, i∈[1,T], T is the total number of display ranges, Indicates P apparent radius; Indicates that the target echo azimuth sidelobe is widened; Indicates the display range. Indicates the number of position data. Indicates the echo data azimuth interval; Indicates the radar power range. Indicates the radar repetition period; Indicates the accumulated number of pulses; Indicates the number of revolutions of the radar antenna; After constructing a multi-period storage matrix of radar echo data, the echo data is accumulated and stored in multiple periods and filled into the multi-period storage matrix respectively; Step 3: Determine the azimuth data period required to compensate for target display splitting in each interval according to the range gradient interval, and form a P display image storage matrix using multi-period data adaptive overlay mapping: First determine the critical distance at which the target sidelobe shows splitting : According to the currently selected display range and critical distance Compare and determine the number of data cycles in the position divided by the distance gradient interval, extract the corresponding data of the multi-cycle storage matrix according to the number of cycles, and form a P display image storage matrix by adaptively superimposing and mapping the multi-cycle data; Among them, according to the currently selected display range and critical distance Compare and determine the number of data cycles for the location divided by the distance gradient interval, specifically: Get the critical distance that the currently selected display range is not greater than the target sidelobe display split The displayed amount program number , where i is the quantity program number, i∈[1,T]; When the selected display quantity program number i≤ When the total number of range gradient intervals S=1, the number of azimuth data cycles participating in the stacking mapping of the full range is is 1, where i is the quantity program number, i∈[1,T], and j is the distance interval number, j∈[1,S]; When the display quantity program number i is selected> When the total number of distance gradient intervals S= , then the number of azimuth data cycles in each distance interval participating in the superposition mapping is Take the distance interval number j; where i is the quantity program number, i∈[1,T], j is the distance interval number, j∈[1, ]; Step 4: Draw the P display image data to achieve smooth display of long-distance target echoes under the radar P display large range.

2. The adaptive recontinuation method for radar target echo azimuth sidelobe display splitting according to claim 1, characterized in that: The radar echo data azimuth interval in step 1 for: ； in, Indicates the radar repetition period; Indicates the accumulated number of pulses; Indicates the number of revolutions of the radar antenna.

3. The adaptive recontinuation method for radar target echo azimuth sidelobe display splitting according to claim 1, characterized in that: The target sidelobe shows the critical distance of splitting for: 。 4. The adaptive recontinuation method for radar target echo azimuth sidelobe display splitting according to claim 1, characterized in that: In step 4, the P display image data is drawn, specifically: According to the selected display range, the periodic data association calculation under the corresponding distance interval division is adaptively retrieved; then the drawing is performed based on the obtained P display image matrix data.

5. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 4 are implemented.

6. A computer storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 4 are implemented.

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