Radar scanning method based on one-dimensional mechanical scanning and one-dimensional phase scanning system antenna

Abstract

According to the radar scanning method based on the one-dimensional mechanical scanning and one-dimensional phase scanning system antenna, the mechanism dimension only needs to move twice when no target exists in the airspace, the movement mechanism does not need to turn back to search for frequent start and stop, and the service life of a rotating part is greatly prolonged. The characteristic that the phase scanning dimension wave control angle can be converted at will is utilized, the mechanism movement speed is set to achieve synchronous cooperation of the radar mechanism and the phased array front end, the phase scanning dimension directly starts again from the starting position after searching the ending position every time, the target can be captured more rapidly under the condition that the target is distributed randomly, and the target tracking accuracy is improved. And the wave control angle can be switched in real time, the search time does not need to be increased, and airspace search and rapid interception are realized. The search range of the mechanism and the front end of the phased array has no special requirements, and quick search, search pause and supplementary search are selected according to the current target state. When a target possibly exists, search is suspended, supplementary search is carried out after no target is confirmed, the capture probability can be improved, and whole airspace coverage can be completed.

Description

Technical Field

[0001] The invention relates to the field of radar detection, and in particular to a radar scanning method based on a one-dimensional mechanical scanning and one-dimensional phase scanning antenna. Background Art

[0002] Radar is an indispensable electronic system for all motion platforms. Different scanning methods are required to search within the field of view to achieve full coverage detection in the airspace. Different scanning methods will affect the service life of the product and the time required for target capture. Scanning method design is an important task for radar target detection.

[0003] With the development of radar application and technology, many radar search and scanning control methods have been proposed. Conventional mechanical scanning radar requires the mechanism to return many times to complete the airspace search, which reduces the service life of the rotating parts.

[0004] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a radar scanning method based on one-dimensional mechanical scanning and one-dimensional phase scanning antenna, which greatly improves the service life of rotating parts, can capture targets more quickly, improve the capture probability and complete full airspace coverage.

[0006] In order to achieve the above object, the present invention provides a radar scanning method based on a one-dimensional mechanical scanning and one-dimensional phase scanning antenna, comprising the following steps:

[0007] Step S1, calculating the starting position a0 that the mechanism needs to point to and the starting position b0 that the wave control needs to point to;

[0008] Step S2, calculating the movement speed v of the mechanism;

[0009] Step S3: Calculate the search center c of the organization A ;

[0010] Step S4: Calculate the search range R of the mechanism A ;

[0011] Step S5: Calculate the phase scanning wave steering direction b i ;

[0012] Step S6: perform airspace search;

[0013] The movement speed v of the mechanism and the search center c of the mechanism A and the search scope of the institution R A The signal is sent to the mechanism, and the mechanism automatically performs a single motion from the starting position to the ending position at a uniform speed v;

[0014] At the same time, the radar system will scan the direction of the wave control b in each frame. i Send to wave control;

[0015] When the organization's search is completed, the wave control will synchronously complete the airspace coverage and stop the search.

[0016] In step S1, the mechanism starting position a0 is set to:

[0017]

[0018] Among them, c A0 For the search center, R A0 is the unilateral search range requirement of the machine scanning, θ is the beam width of the machine scanning, and a is the current pointing angle of the mechanism;

[0019] The starting position b0 of phase scanning wave control is set as:

[0020] b0=c B0 -R B0 (2)

[0021] Among them, c B0 For the search center, R B0 It is the single-sided search range requirement for phase scanning.

[0022] In step S2, the movement speed v of the mechanism is:

[0023]

[0024] Among them, R B0 is the phase scanning unilateral search range requirement, θ is the machine scanning beam width, is the phase scanning beam width, T is the radar frame period, α is the machine scanning beam overlap rate, and β is the phase scanning beam overlap rate.

[0025] In step S3, the radar system needs to send the search center c of the motion mechanism to A for:

[0026] c A =c A0 -θ / 2(4)

[0027] Among them, c A0 is the search center, and θ is the scanning beam width.

[0028] In step S4, the radar system needs to send a unilateral search range R to the motion mechanism. A for:

[0029] R A =R A0 +θ / 2(5)

[0030] Among them, R A0 is the unilateral search range requirement of the machine scanning dimension, and θ is the beam width of the machine scanning dimension.

[0031] In step S5, when the mechanism starts searching and has not completed the search, the radar system needs to send each frame to the direction b of the phase scanning wave control. i for:

[0032]

[0033] Among them, b0 is the starting position of phase scanning wave control, is the phase scanning beam width, β is the phase scanning beam overlap ratio, c B0 For the search center, R B0 It is the single-sided search range requirement for phase scanning.

[0034] During the movement of the mechanism and wave control, if a possible target is found, the search is paused and the mechanism and wave control stop at the current position a i and b i .

[0035] If after the search is paused, it is found that it is not the real target or is lost after tracking, the remaining airspace search is completed according to steps S1 to S6.

[0036] The present invention only needs to perform two movements of the mechanism dimension when there is no target in the airspace, and the motion mechanism does not need to return to search and start and stop frequently, and only needs to perform a few movements, which greatly improves the service life of the rotating parts. By utilizing the characteristic that the wave control angle of the phase scanning dimension can be converted at will, the movement speed of the mechanism is set to realize the synchronous coordination of the radar's own mechanism and the front end of the phased array. After each search to the end position of the phase scanning dimension, it directly starts again from the starting position, and performs a cyclic search from the starting position to the end position. Compared with the traditional four-row serpentine scanning method under the condition of random target distribution, it can capture the target more quickly in a statistical sense, and the wave control angle can be switched in real time, without increasing the search time, so as to realize airspace search and rapid interception. There are no special requirements for the search range of the mechanism and the front end of the phased array. According to the current target state, fast search, search pause and supplementary search are selected respectively. When there may be a target, the search is paused, and supplementary search is performed after confirming that there is no target, which can improve the capture probability and complete the full airspace coverage. The processing process of the present invention is low in complexity, saves information processor resources, has a small overall calculation amount, and is easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the traditional scanning method.

[0038] Figure 2 The present invention provides a flow chart of a radar scanning method based on a one-dimensional mechanical scanning and one-dimensional phase scanning antenna.

[0039] Figure 3 It is a schematic diagram of the scanning method of the present invention. DETAILED DESCRIPTION

[0040] The following is based on Figure 1 to Figure 3 , specifically describe the preferred embodiments of the present invention.

[0041] Figure 1 This is a schematic diagram of the traditional scanning method. Figure 1 It can be seen that the traditional scanning method requires the mechanism to make multiple turns and the search area is continuous. In a statistical sense, it takes longer to capture the target.

[0042] The present invention provides a radar scanning method based on a one-dimensional mechanical scanning and one-dimensional phase scanning antenna. In a darkroom capable of transmitting and receiving microwave signals, the one-dimensional mechanical scanning and one-dimensional phase scanning antenna is installed on a turntable, and the rear end of the antenna is connected to a radar signal processor and accessed to a radar system.

[0043] like Figure 2 As shown, the radar scanning method based on one-dimensional mechanical scanning and one-dimensional phase scanning antenna provided by the present invention specifically comprises the following steps:

[0044] Step S1, calculating the starting position that the mechanism and wave control need to point to;

[0045] The mechanism starting position a0 is set as:

[0046]

[0047] Among them, c A0 For the search center, R A0 is the unilateral search range requirement of the machine scanning, θ is the beam width of the machine scanning, and a is the current pointing angle of the mechanism;

[0048] The starting position b0 of phase scanning wave control is set as:

[0049] b0=c B0 -R B0 (2)

[0050] Among them, c B0 For the search center, R B0 It is the requirement of single-side search range of phase scanning dimension;

[0051] Step S2, calculating the movement speed of the mechanism;

[0052] The movement speed v of the mechanism is:

[0053]

[0054] Among them, R B0 is the phase scanning unilateral search range requirement, θ is the machine scanning beam width, is the phase scanning beam width, T is the radar frame period, α is the machine scanning beam overlap rate, and β is the phase scanning beam overlap rate;

[0055] Step S3, calculating the search center of the organization;

[0056] The radar system needs to send the search center c to the motion mechanism A for:

[0057] c A =c A0 -θ / 2(4)

[0058] Among them, c A0 is the search center, θ is the machine scanning beam width;

[0059] Step S4, calculating the search range of the mechanism;

[0060] The radar system needs to send a unilateral search range R to the motion mechanism. A for:

[0061] R A =R A0 +θ / 2(5)

[0062] Among them, R A0 is the unilateral search range requirement of the machine scanning dimension, θ is the beam width of the machine scanning dimension;

[0063] Step S5, calculating the phase scanning wave control pointing direction;

[0064] When the mechanism starts searching and has not completed the search, the radar system needs to send the pointing b of the phase scanning wave control to each frame. i for:

[0065]

[0066] Among them, b0 is the starting position of phase scanning wave control, is the phase scanning beam width, β is the phase scanning beam overlap ratio, c B0 For the search center, R B0 It is the requirement of single-side search range of phase scanning dimension;

[0067] Step S6: perform airspace search;

[0068] The movement speed v of the mechanism and the search center c of the mechanism A and the search scope of the institution R A The signal is sent to the mechanism, and the mechanism automatically performs a single motion from the starting position to the ending position at a uniform speed v;

[0069] At the same time, the radar system will scan the direction of the wave control b in each frame. i Send to wave control;

[0070] When the organization's search is completed, the wave control will synchronously complete the airspace coverage and stop the search.

[0071] During the movement of the mechanism and wave control, if a target is found, the mechanism and wave control stop at the current position a. i and b i If, after the search is paused, it is found that it is not the real target or is lost after tracking, the remaining airspace search is completed according to steps S1 to S6 to achieve full airspace coverage.

[0072] like Figure 3 As shown, the shaded area is the area to be searched. Figure 3 Taking the medium working condition as an example, the mechanism only needs to move once from top to bottom, and the wave control dimension searches back and forth from left to right many times. The first row search and the second row search of the wave control dimension are not continuous, which statistically captures the target faster than the traditional method.

[0073] Example

[0074] Starting position setting: point both the mechanism and wave control to the starting position. If the machine scanning unilateral search range requirement R A0 is 10°, search center c A0 0°; Phase scanning dimension single-side search range requirement R B0 is 8°, search center c B0 is 0°; the current pointing angle a of the mechanism is -3°, and the machine scanning beam width θ is 1°, then the mechanism starting position a0 is set to -11°, and the starting position b0 of the phase scanning wave control is set to -8°.

[0075] Calculate the movement speed of the mechanism: Set the unilateral search range requirement R of the machine scanning A0 The phase scanning dimension single-sided search range requirement is R B0 is 8°, the machine scanning beam width θ is 1°, and the phase scanning beam width is 1.2, the radar frame period T is 1s, the machine scanning beam overlap rate α is 25%, and the phase scanning beam overlap rate β is 25%, then the movement speed v of the mechanism is 0.0422° / s.

[0076] Calculate the search center of the mechanism: The radar system needs to send the search center c of the motion mechanism A It is -0.5°.

[0077] Calculate the search range of the mechanism: The radar system needs to send the unilateral search range R of the motion mechanism A 10.5°

[0078] Calculate the phase scanning wave control direction: When the mechanism starts searching and has not completed the search, the radar system needs to send the phase scanning wave control direction b to the phase scanning wave control in each frame. i for:

[0079]

[0080] Airspace search: The search control of the mechanism is to set the motion v to 0.0422° / s and the search center c A is -0.5° and the search range is R A The mechanism automatically performs a single motion from the starting position to the ending position at a constant speed v of 0.0422° / s. At the same time, each frame will scan the direction b of the wave control. i Sent to the wave control; when the organization's search is completed, the wave control will synchronously complete the airspace coverage and stop searching.

[0081] Search pause: If the mechanism and wave control find a possible target during the 4° and 6° movement, the mechanism and wave control stop at the current position a i is 4° and b i It is 6°.

[0082] Supplementary search: If after the search is paused it is discovered that the target is not the real target or is lost after tracking, follow the above steps to complete the search of the remaining airspace to achieve full coverage of the airspace.

[0083] The present invention only needs to perform two movements of the mechanism dimension when there is no target in the airspace, and the motion mechanism does not need to return to search and start and stop frequently, and only needs to perform a few movements, which greatly improves the service life of the rotating parts. By utilizing the characteristic that the wave control angle of the phase scanning dimension can be converted at will, the movement speed of the mechanism is set to realize the synchronous coordination of the radar's own mechanism and the front end of the phased array. After each search to the end position of the phase scanning dimension, it directly starts again from the starting position, and performs a cyclic search from the starting position to the end position. Compared with the traditional four-row serpentine scanning method under the condition of random target distribution, it can capture the target more quickly in a statistical sense, and the wave control angle can be switched in real time, without increasing the search time, so as to realize airspace search and rapid interception. There are no special requirements for the search range of the mechanism and the front end of the phased array. According to the current target state, fast search, search pause and supplementary search are selected respectively. When there may be a target, the search is paused, and supplementary search is performed after confirming that there is no target, which can improve the capture probability and complete the full airspace coverage. The processing process of the present invention is low in complexity, saves information processor resources, has a small overall calculation amount, and is easy to implement.

[0084] It should be noted that, in the embodiments of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0085] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0086] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0087] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0088] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0089] As used in this specification and the appended claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0090] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as limiting the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention. After reading the above content, it will be obvious for those skilled in the art to make various modifications and substitutions to the present invention. Therefore, the scope of protection of the present invention should be defined by the attached claims.

Claims

1. A radar scanning method based on one-dimensional mechanical scanning and one-dimensional phase scanning antenna, characterized in that: The following steps are involved: Step S1, calculating the starting position a0 that the mechanism needs to point to and the starting position b0 that the wave control needs to point to; Step S2, calculating the movement speed v of the mechanism; Step S3: Calculate the search center c of the organization A ; Step S4: Calculate the search range R of the mechanism A ; Step S5: Calculate the phase scanning wave steering direction b i ; Step S6: perform airspace search; The movement speed v of the mechanism and the search center c of the mechanism A and the search scope of the institution R A The signal is sent to the mechanism, and the mechanism automatically performs a single motion from the starting position to the ending position at a uniform speed v; At the same time, the radar system will scan the direction of the wave control b in each frame. i Send to wave control; When the organization's search is completed, the wave control will synchronously complete the airspace coverage and stop the search.

2. The radar scanning method based on one-dimensional mechanical scanning and one-dimensional phase scanning antenna as claimed in claim 1, characterized in that: In step S1, the mechanism starting position a0 is set to: Among them, c A0 For the search center, R A0 is the unilateral search range requirement of the machine scanning, θ is the beam width of the machine scanning, and a is the current pointing angle of the mechanism; The starting position b0 of phase scanning wave control is set as: b0=c B0 -R B0 (2) Among them, c B0 For the search center, R B0 It is the single-sided search range requirement for phase scanning.

3. The radar scanning method based on one-dimensional mechanical scanning and one-dimensional phase scanning antenna as claimed in claim 2, characterized in that: In step S2, the movement speed v of the mechanism is: Among them, R B0 is the phase scanning unilateral search range requirement, θ is the machine scanning beam width, is the phase scanning beam width, T is the radar frame period, α is the machine scanning beam overlap rate, and β is the phase scanning beam overlap rate.

4. The radar scanning method based on one-dimensional mechanical scanning and one-dimensional phase scanning antenna as claimed in claim 3, characterized in that: In step S3, the radar system needs to send the search center c of the motion mechanism to A for: c A =c A0 -θ / 2 (4) Among them, c A0 is the search center, and θ is the scanning beam width.

5. The radar scanning method based on one-dimensional mechanical scanning and one-dimensional phase scanning antenna as claimed in claim 3, characterized in that: In step S4, the radar system needs to send a unilateral search range R to the motion mechanism. A for: R A =R A0 +θ / 2 (5) Among them, R A0 is the unilateral search range requirement of the machine scanning dimension, and θ is the beam width of the machine scanning dimension.

6. The radar scanning method based on one-dimensional mechanical scanning and one-dimensional phase scanning antenna as claimed in claim 3, characterized in that: In step S5, when the mechanism starts searching and has not completed the search, the radar system needs to send each frame to the direction b of the phase scanning wave control. i for: Among them, b0 is the starting position of phase scanning wave control, is the phase scanning beam width, β is the phase scanning beam overlap ratio, c B0 For the search center, R B0 It is the single-sided search range requirement for phase scanning.

7. The radar scanning method based on one-dimensional mechanical scanning and one-dimensional phase scanning antenna as claimed in claim 6, characterized in that: During the movement of the mechanism and wave control, if a possible target is found, the search is paused and the mechanism and wave control stop at the current position a i and b i .

8. The radar scanning method based on one-dimensional mechanical scanning and one-dimensional phase scanning antenna as claimed in claim 7, characterized in that: If after the search is paused, it is found that it is not the real target or is lost after tracking, the remaining airspace search is completed according to steps S1 to S6.

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