Interferometer direction-finding and angle-measuring evaluation error correction method and device, medium and product

Abstract

The invention discloses an interferometer direction-finding and angle-measuring evaluation error correction method and device, a medium and a product, and relates to the technical field of radio direction-finding testing. The method comprises the following steps: firstly, adjusting the angle of a test turntable to an initial position; then measuring the distance d from the target radiation source to the center of the direction-finding antenna sub-array and the eccentric radius r of the direction-finding antenna sub-array relative to the center of the test turntable; rotating the direction-finding rotary table to a certain test angle alpha, and recording a target radiation source measurement angle theta'output by the detected interferometer direction-finding system at the moment; then calculating a correction angle beta and a direction-finding evaluation benchmark theta after correcting an eccentric angle measurement error; then calculating a direction finding precision evaluation error delta after the eccentric angle measurement error is corrected; and finally, based on the direction-finding precision evaluation error delta, accurately evaluating the direction-finding precision of the detected interferometer direction-finding system. The method improves the evaluation accuracy of the direction finding precision of the tested system, and enables the evaluation of the direction finding performance of the tested system to be closer to the real level.

Description

Technical Field

[0001] The invention relates to the technical field of radio direction finding test, and in particular to an interferometer direction finding and angle measurement evaluation error correction method, device, medium and product. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0003] Radio direction finding technology is widely used in both civil and military fields, such as direction finding and positioning of illegal radio stations, direction finding and positioning of specific target electromagnetic radiation sources, etc. In the radio direction finding system, direction finding accuracy is one of the most important performance evaluation indicators and is the core test item of the radio direction finding system inspection and testing.

[0004] Interferometer direction finding technology is a widely used technology in radio direction finding systems due to its small size and high direction finding accuracy. Among interferometer direction finding technology systems, linear array interferometer is the most common. By measuring the phase difference of electromagnetic waves received by a group of antenna units with unequal spacing (baseline) linear array from a distant target radiation source, the azimuth measurement result of the target radiation source relative to the antenna normal is calculated, such as Figure 2 shown.

[0005] When conducting a direction finding test on an interferometer direction finding system, the current popular practice is to place the direction finding antenna array at the center of the test turntable, with the radiation source fixed in place. By rotating the test turntable, the angle of the radiation source relative to the normal direction of the direction finding antenna is changed to simulate different azimuth incidences of the radiation source, and to conduct a direction finding accuracy test within the azimuth coverage range. Figure 3 As shown, the direction-finding antenna array is placed at the center of the turntable. The left side of the figure is the initial position. The antenna normal points to the target radiation source, and the relative angle is 0°. As the turntable rotates clockwise by an angle α, Figure 3 At the position shown in the figure on the right, the theoretical value of the relative angle between the radiation source and the normal direction of the antenna array is θ'=α. Therefore, the difference δ=|θ-α| between the actual measured angle θ of the interferometer direction finding system and the turntable rotation angle α can be used to evaluate the direction finding accuracy performance of the interferometer direction finding system.

[0006] However, in some cases, the interferometer direction-finding antenna array is difficult to be placed exactly at the center of the test turntable in the actual direction-finding test due to structural layout and other reasons. For example, in a wide-band interferometer direction-finding system, due to the wide frequency band, the interferometer direction-finding antenna array is divided into multiple direction-finding sub-arrays according to different frequency bands and integrated on a physical array surface. Figure 4 In the direction finding test, even if the center of the entire array is arranged at the center of the turntable, it is difficult for the antenna subarray of each frequency band to be arranged at the center of the turntable at the same time, and there will be a certain axial distance r offset relative to the center of the turntable.

[0007] In this case, the initial target radiation source is kept in the normal direction of the direction-finding antenna array. If the turntable is rotated instantaneously by an angle α, the theoretical value of the angle θ between the target radiation source and the normal direction of the antenna array is no longer the same as α. Figure 5 As shown. At this time, if the turntable rotation angle α is used to evaluate the azimuth measurement angle accuracy of the direction finding system, a certain evaluation error will be brought about, which is the eccentric angle measurement evaluation error. In order to reduce the negative impact of this error on the evaluation of direction finding accuracy, the current common treatment method is to require that the distance d between the target radiation source and the direction finding antenna array during the test is much larger than the axial eccentric distance r of the antenna array, so that the eccentric angle measurement evaluation error can be ignored. This method is suitable for outdoor open field test conditions, but in darkroom conditions or other situations where the space is limited and the distance between the radiation source and the direction finding antenna array cannot be guaranteed to be far enough, the eccentric angle measurement evaluation error cannot be ignored. In order to improve the evaluation accuracy of the direction finding performance indicators of the measured direction finding system, necessary corrections need to be made. Summary of the invention

[0008] The purpose of the present invention is to propose an interferometer direction and angle measurement evaluation error correction method, device, medium and product for a turntable-based interferometer direction finding performance evaluation test of a turntable-based interferometer direction finding application system, when the antenna array axis is arranged eccentrically to the left.

[0009] The technical solution of the present invention is as follows:

[0010] An interferometer direction and angle measurement evaluation error correction method, comprising:

[0011] Step S1: Adjust the test turntable angle to the initial position α=0°;

[0012] Step S2: measuring the distance d from the target radiation source to the center of the direction-finding antenna subarray and the eccentric radius r of the direction-finding antenna subarray relative to the center of the test turntable;

[0013] Step S3: within the direction finding coverage range of the direction finding system of the interferometer under test, the direction finding turntable is rotated to a certain test angle α, and the target radiation source measurement angle θ' output by the direction finding system of the interferometer under test is recorded at this time;

[0014] Step S4: Calculate the correction angle β according to the test angle α of the test turntable, the distance d from the target radiation source to the center of the direction-finding antenna subarray, and the eccentric radius r of the direction-finding antenna subarray relative to the center of the test turntable;

[0015] Step S5: Based on the correction angle β, the direction finding evaluation reference θ after correcting the eccentric angle measurement error is calculated;

[0016] Step S6: Calculate the direction finding accuracy evaluation error 6 after correcting the eccentric angle measurement error based on the target radiation source measurement angle θ' and the direction finding evaluation reference θ after correcting the eccentric angle measurement error;

[0017] Step S7: Based on the direction finding accuracy evaluation error 6 after correcting the eccentric angle measurement error, the direction finding accuracy of the measured interferometer direction finding system is accurately evaluated.

[0018] Furthermore, the step S1 comprises:

[0019] After the direction-finding antenna subarray of the interferometer direction-finding system under test is installed on the test turntable, the test turntable angle is adjusted so that the center normal of the direction-finding antenna subarray points to the target radiation source, and the test turntable angle α is reset to 0° at this time.

[0020] Furthermore, the eccentric radius r of the direction-finding antenna subarray relative to the center of the test turntable is the distance r between the center of the direction-finding antenna subarray and the center of the test turntable.

[0021] Furthermore, the step S3 comprises:

[0022] The clockwise rotation of the test turntable is defined as a positive angle, the left incident angle of the center normal of the direction-finding antenna subarray is defined as a negative angle, and the right incident angle is defined as a positive angle.

[0023] Furthermore, the step S4 comprises:

[0024]

[0025] Furthermore, the step S5 comprises:

[0026] θ=-(α+β)

[0027] Furthermore, the step S6 comprises:

[0028] δ=|θ-θ'|

[0029] The present invention also provides a computing device, comprising:

[0030] At least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the above-mentioned interferometer direction-finding and angle-measuring evaluation error correction method.

[0031] The present invention also proposes a computer terminal storage medium storing computer terminal executable instructions, wherein the computer terminal executable instructions are used to execute the above-mentioned interferometer direction and angle measurement evaluation error correction method.

[0032] The present invention also proposes a computer program product, which implements the above-mentioned interferometer direction and angle measurement evaluation error correction method when the computer program is executed by a processor.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The traditional method evaluates the direction finding accuracy of the measured system based only on the turntable angle, which causes eccentric angle measurement evaluation errors. The present invention improves the accuracy of the direction finding accuracy evaluation of the measured system in this case, making the evaluation of the direction finding performance of the measured system closer to its actual level. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a flow chart of an error correction method for interferometer direction and angle measurement evaluation;

[0036] Figure 2 This is the principle diagram of interferometer direction finding;

[0037] Figure 3 This is a schematic diagram of direction finding test based on the test turntable;

[0038] Figure 4 It is a schematic diagram of the interferometer direction-finding array plane integrating multi-band direction-finding antenna sub-arrays;

[0039] Figure 5 This is a schematic diagram showing that the rotation angle of the turntable for the left eccentric deployment of the antenna subarray is no longer the same as the azimuth angle of the radiation source;

[0040] Figure 6 This is a test example diagram of a certain type of interferometer direction-finding system. DETAILED DESCRIPTION

[0041] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0042] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0043] Embodiment 1

[0044] See also Figure 1 , a method for correcting interferometer direction and angle measurement evaluation errors, comprising:

[0045] Step S1: Adjust the test turntable angle to the initial position α=0°;

[0046] Step S2: Figure 5 In the case shown in the left figure, measure the distance d from the target radiation source to the center of the direction-finding antenna subarray and the eccentric radius r of the direction-finding antenna subarray relative to the center of the test turntable;

[0047] Step S3: within the direction finding coverage range of the direction finding system of the interferometer under test, the direction finding turntable is rotated to a certain test angle α, and the target radiation source measurement angle θ' output by the direction finding system of the interferometer under test is recorded at this time;

[0048] Step S4: Calculate the correction angle β according to the test angle α of the test turntable, the distance d from the target radiation source to the center of the direction-finding antenna subarray, and the eccentric radius r of the direction-finding antenna subarray relative to the center of the test turntable;

[0049] Step S5: Based on the correction angle β, the direction finding evaluation reference θ after correcting the eccentric angle measurement error is calculated;

[0050] Step S6: Calculate the direction finding accuracy evaluation error δ after correcting the eccentric angle measurement error based on the target radiation source measurement angle θ' and the direction finding evaluation reference θ after correcting the eccentric angle measurement error;

[0051] Step S7: Based on the direction finding accuracy evaluation error δ after correcting the eccentric angle measurement error, the direction finding accuracy of the measured interferometer direction finding system is accurately evaluated.

[0052] In this embodiment, specifically, step S1 includes:

[0053] After the direction-finding antenna subarray of the interferometer direction-finding system under test is installed on the test turntable, adjust the angle of the test turntable so that the center normal of the direction-finding antenna subarray points to the target radiation source, such as Figure 5 As shown in the left figure, the test turntable angle α is reset to 0° at this time.

[0054] In this embodiment, specifically, the eccentric radius r of the direction-finding antenna subarray relative to the center of the test turntable is the distance r between the center of the direction-finding antenna subarray and the center of the test turntable.

[0055] In this embodiment, specifically, step S3 includes:

[0056] The clockwise rotation of the test turntable is defined as a positive angle, the left incident angle of the center normal of the direction-finding antenna subarray is defined as a negative angle, and the right incident angle is defined as a positive angle.

[0057] In this embodiment, specifically, step S4 includes:

[0058]

[0059] In this embodiment, specifically, step S5 includes:

[0060] θ=-(α+β)

[0061] In this embodiment, specifically, step S6 includes:

[0062] δ=|θ-θ'|

[0063] In addition, in some embodiments, a computing device is provided, comprising:

[0064] At least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the above-mentioned interferometer direction-finding and angle-measurement evaluation error correction method; examples of computing devices include PCs, tablet computers, smart phones or PDAs, etc.

[0065] In addition, in some embodiments, a computer terminal storage medium is also proposed, which stores computer terminal executable instructions, and the computer terminal executable instructions are used to execute the above-mentioned interferometer direction and angle measurement evaluation error correction method; examples of computer storage media include magnetic storage media (for example, floppy disks, hard disks, etc.), optical recording media (for example, CD-ROMs, DVDs, etc.) or memories, such as memory cards, ROMs or RAMs, etc. Computer storage media can also be distributed on network-connected computer systems, such as application stores.

[0066] In addition, in some embodiments, a computer program product is proposed, and when the computer program is executed by a processor, the above-mentioned interferometer direction and angle measurement evaluation error correction method is implemented.

[0067] Embodiment 2

[0068] This embodiment takes the direction finding test of a certain type of radio direction finding system as an example. The antenna array axis is deployed eccentrically to the left, the left eccentric radius of the antenna array is r=1 meter, the distance between the initial position and the center of the antenna array and the radiation source is d=20 meters, and the direction finding test range is that the test turntable rotation angle α is -45° to 45°, with an interval of 5° (the instantaneous clockwise rotation of the test turntable is defined as a positive angle, and the normal incident angle of the antenna array to the left is defined as a negative angle, and the incident angle to the right is defined as a positive angle). Figure 6 shown.

[0069] The specific implementation steps are as follows:

[0070] Step S1: After the direction-finding antenna subarray of the interferometer direction-finding system under test is installed on the test turntable, the turntable angle is adjusted so that the center normal of the direction-finding antenna subarray points to the target radiation source, such as Figure 5As shown in the left figure, the test turntable angle α is reset to 0° at this time.

[0071] Step S2: measuring the distance d from the target radiation source to the center of the direction-finding antenna subarray and the eccentric radius r of the direction-finding antenna subarray relative to the center of the test turntable, and the measurement results are: r=1m, d=20m.

[0072] Step S3: Rotate the direction-finding turntable to each test angle α, and record the target radiation source measurement angle θ' output by the direction-finding system of the interferometer under test at this time, and obtain the direction-finding measurement value list as follows:

[0073] Table 1 Direction finding measurement values ​​1

[0074] α -45° -40° -35° -30° -25° -20° -15° -10° -5° θ′ 44.81° 39.76° 34.73° 29.33° 24.42° 20.11° 14.96° 10.11° 4.92°

[0075] Table 2 Direction finding measurement values ​​2

[0076] α 0° 5° 10° 15° 20° 25° 30° 35° 40° 45° θ 0.1° -5.23° -10.13° -15.36° -20.47° -25.46° -30.53° -35.97° -41.12° -46.41°

[0077] Step S4: For each test turntable angle α within the direction finding coverage, calculate the correction angle β and obtain the correction value list as follows:

[0078] Table 3 Eccentricity correction value list 1

[0079] α -45° -40° -35° -30° -25° -20° -15° -10° -5° β 0.810° 0.649° 0.504° 0.374° 0.263° 0.170° 0.096° 0.043° 0.011°

[0080] Table 4 Eccentricity correction value list 2

[0081] α 0° 5° 10° 15° 20° 25° 30° 35° 40° 45° β 0° 0.011° 0.044° 0.099° 0.176° 0.274° 0.394° 0.533° 0.693° 0.870°

[0082] Step S5: Based on the correction angle β, the direction finding evaluation reference θ after the eccentric angle measurement error is corrected is calculated, and the direction finding evaluation reference value list after the eccentric angle measurement error is corrected is obtained as follows:

[0083] Table 5 Direction finding evaluation reference values ​​after correcting the eccentric angle measurement error List 1

[0084] α -45° -40° -35° -30° -25° -20° -15° -10° -5° θ 44.190° 39.351° 34.496° 29.626° 24.737° 19.830° 14.904° 9.957° 4.989°

[0085] Table 6 List 2 of direction finding evaluation reference values ​​after correcting the eccentric angle measurement error

[0086] α 0° 5° 10° 15° 20° 25° 30° 35° 40° 45° θ 0° -5.011° -10.044° -15.099° -20.176° -25.274° -30.394° -35.533° -40.693° -45.870°

[0087] Step S6: Based on the target radiation source measurement angle θ' and the direction finding evaluation reference θ after correcting the eccentric angle measurement error, the direction finding accuracy evaluation error δ after correcting the eccentric angle measurement error is calculated, and the direction finding accuracy evaluation error value list after correcting the eccentric angle measurement error is obtained as follows:

[0088] Table 7 Direction finding accuracy evaluation error list after correcting the eccentric angle measurement error 1

[0089] α -45° -40° -35° -30° -25° -20° -15° -10° -5° θ' 44.81° 39.76° 34.73° 29.33° 24.42° 20.11° 14.96° 10.11° 4.92° θ 44.190° 39.351° 34.496° 29.626° 24.737° 19.830° 14.904° 9.957° 4.989° δ 0.620° 0.409° 0.234° 0.296° 0.317° 0.280° 0.056° 0.153° 0.069°

[0090] Table 8 Direction finding accuracy evaluation error list 2 after correcting the eccentric angle measurement error

[0091] α 0° 5° 10° 15° 20° 25° 30° 35° 40° 45° θ' 0.10° -5.23° -10.13° -15.36° -20.47° -25.46° -30.53° -35.97° -41.12° -46.41° θ 0° -5.011° -10.044° -15.099° -20.176° -25.274° -30.394° -35.533° -40.693° -45.870° δ 0.100 0.219° 0.086° 0.261° 0.294° 0.186° 0.136° 0.437° 0.428° 0.540°

[0092] Step S7: Based on the direction finding accuracy evaluation error δ after correcting the eccentric angle measurement error, the direction finding accuracy of the measured interferometer direction finding system is accurately evaluated.

[0093] The above-mentioned embodiments only express the specific implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the protection scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the technical solution concept of the present application, and these all belong to the protection scope of the present application.

[0094] This background section is provided to generally present the context of the invention, and the work of the presently named inventors, the work to the extent described in this background section, and aspects of this section that did not constitute prior art at the time of application are neither explicitly nor implicitly admitted to be prior art to the present invention.

Claims

1. A method for correcting errors in interferometer direction and angle measurement evaluation, characterized in that: include: Step S1: Adjust the test turntable angle to the initial position α=0°; Step S2: measuring the distance d from the target radiation source to the center of the direction-finding antenna subarray and the eccentric radius r of the direction-finding antenna subarray relative to the center of the test turntable; Step S3: within the direction finding coverage range of the direction finding system of the interferometer under test, the direction finding turntable is rotated to a certain test angle α, and the target radiation source measurement angle θ' output by the direction finding system of the interferometer under test is recorded at this time; Step S4: Calculate the correction angle β according to the test angle α of the test turntable, the distance d from the target radiation source to the center of the direction-finding antenna subarray, and the eccentric radius r of the direction-finding antenna subarray relative to the center of the test turntable; Step S5: Based on the correction angle β, the direction finding evaluation reference θ after correcting the eccentric angle measurement error is calculated; Step S6: Calculate the direction finding accuracy evaluation error δ after correcting the eccentric angle measurement error based on the target radiation source measurement angle θ' and the direction finding evaluation reference θ after correcting the eccentric angle measurement error; Step S7: Based on the direction finding accuracy evaluation error δ after correcting the eccentric angle measurement error, the direction finding accuracy of the measured interferometer direction finding system is accurately evaluated.

2. The interferometer direction and angle measurement evaluation error correction method according to claim 1, characterized in that: The step S1 comprises: After the direction-finding antenna subarray of the interferometer direction-finding system under test is installed on the test turntable, the test turntable angle is adjusted so that the center normal of the direction-finding antenna subarray points to the target radiation source, and the test turntable angle α is reset to 0°.

3. The interferometer direction and angle measurement evaluation error correction method according to claim 1, characterized in that: The eccentric radius r of the direction-finding antenna subarray relative to the center of the test turntable is the distance r between the center of the direction-finding antenna subarray and the center of the test turntable.

4. The method for correcting the error in interferometer direction and angle measurement evaluation according to claim 1, characterized in that: The step S3 comprises: The clockwise rotation of the test turntable is defined as a positive angle, the left incident angle of the center normal of the direction-finding antenna subarray is defined as a negative angle, and the right incident angle is defined as a positive angle.

5. The method for correcting the error in interferometer direction and angle measurement evaluation according to claim 1, characterized in that: The step S4 comprises:

6. The method for correcting the error in interferometer direction and angle measurement evaluation according to claim 1, characterized in that: The step S5 comprises: 0＝-(α+β)。 7. The method for correcting the error in interferometer direction and angle measurement evaluation according to claim 1, characterized in that: The step S6 comprises: 6＝0-0。 8. A computing device, characterized in that: include: at least one processor; And a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute an interferometer direction and angle measurement evaluation error correction method as described in any one of claims 1 to 7.

9. A computer terminal storage medium storing computer terminal executable instructions, characterized in that: The computer terminal executable instructions are used to execute an interferometer direction and angle measurement evaluation error correction method as described in any one of claims 1-7.

10. A computer program product, characterized in that When the computer program is executed by a processor, an interferometer direction and angle measurement evaluation error correction method as described in any one of claims 1 to 7 is implemented.

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