Angle measurement method of continuous scanning long-time accumulation radar
By integrating cumulative and difference beam antenna patterns, the method addresses the challenge of accurate angle measurement in continuous scanning radars, allowing for precise target detection of distant small targets.
Patent Information
- Application Number
- CN202411274928.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-01-03
AI Technical Summary
Continuous scanning mechanical radars face challenges in achieving accurate target angle measurement during long-term accumulation due to the changing antenna direction, rendering traditional single-pulse amplitude or phase comparison ineffective for long-distance small target detection.
The method involves obtaining a cumulative sum difference beam antenna pattern through overlapping and segmented integration of mechanical scanning radar and difference beam antenna patterns, enabling high-precision target angle measurement during long-term accumulation.
Enables simultaneous long-distance small target detection and high-precision target angle measurement for continuous mechanical scanning radars.
Smart Images
Figure CN119247338A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of radars, and in particular relates to an angle measurement method of a continuous scanning long-time accumulation radar. Background Art
[0002] When a mechanical scanning radar realizes target search or multi-target tracking, it usually uses the radar to continuously scan the airspace to be observed, and the single pulse signals received by multiple channels in the radar are compared in amplitude or phase to achieve high-precision measurement of the target angle. However, as the radar detection target distance continues to increase and the target's RCS continues to decrease, a single pulse can no longer detect the target. Only the long-term coherent accumulation of multiple pulses can meet the detection needs of long-distance small targets. For a continuously scanning mechanical radar, the direction of the antenna pattern is constantly changing, which means that during the long-term multi-pulse accumulation process of target detection, different pulses may come from different positions of the antenna pattern. Therefore, the traditional single-pulse amplitude or phase angle measurement is ineffective for continuous mechanical scanning radars that require long-term accumulation, and it is necessary to find a new angle measurement method under this working mode. Summary of the invention
[0003] In order to solve the technical problem that continuous scanning long-term accumulation radar cannot use traditional single-pulse amplitude comparison or phase comparison to achieve accurate target angle measurement, the present invention proposes a method for obtaining the cumulative and difference beam antenna patterns of continuous scanning radar by overlapping and segmented integration of mechanical scanning radar and difference beam antenna patterns. Based on the cumulative and difference beam antenna patterns, continuous mechanical scanning radar can be used to achieve long-distance small target detection through long-term accumulation while achieving high-precision target angle measurement.
[0004] The technical solution adopted by the present invention is as follows:
[0005] The continuous scanning radar cumulative sum difference beam antenna pattern is obtained by overlapping and segmented integration of the continuous mechanical scanning radar and difference beam antenna pattern, and the cumulative pattern is then used to achieve high-precision measurement of the target angle. The specific steps are as follows:
[0006] 1. Determine the antenna pattern G of the continuous scanning radar and the difference beam ∑ (θ) and G α (θ), θ∈(θ min ,θ max ).
[0007] 2. Determine the rotation speed ω of the antenna and the accumulation time Δt required for target detection, and calculate the accumulation angle Δθ required for target detection = ωΔt. The accumulation angle Δθ required for target detection must be less than the antenna width θ of the beam antenna pattern. beam .
[0008] 3. Determine the step value θ for the overlapped segmented integration process of the radar and difference beam antenna patterns step , step value θ step Need to be smaller than the radar's angular resolution θ res .
[0009] 4. According to the antenna pattern G of the radar sum and difference beam ∑ (θ) and G Δ (θ), θ∈(θ min ,θ max ), the accumulated rotation angle Δθ required for target detection and the step value θ of the overlapped segmented integration processing of the radar and difference beam antenna patterns step Calculate the cumulative sum difference beam antenna pattern G of the continuous scanning radar ∑ ′ (θ ‘ ) and G ′ Δ 9θ ‘ ), G ∑ ′ (θ ‘ ) and G ′ Δ (θ ‘ The specific calculation method of ) is as follows:
[0010]
[0011] Where θ1 = θ ‘ -Δθ,θ N =θ ‘ ,θ i+1 -θ i =θ step ,θ ‘ ∈(θ min +Δθ,θ max ).
[0012] 5. Calculate the difference and ratio curve of the cumulative and difference beam antenna pattern of the continuous scanning radar:
[0013] 6. Calculate the cumulative sum of antenna and difference channel signals within the accumulated rotation angle Δθ of the target
[0014]
[0015] Among them, θ ’ 0 is the target’s arrival direction, θ1=θ ’ 0-Δθ,θ N =θ ’ 0, θ i+1 -θ i =θ step .
[0016] 7. Calculate the ratio of the accumulated sum of antenna and difference channel signals And look up the table to get the target's arrival direction θ'0.
[0017] The beneficial effects of the present invention are
[0018] It solves the technical problem that continuous scanning and long-time accumulation radar cannot use traditional single-pulse amplitude comparison or phase comparison to achieve accurate target angle measurement. Continuous mechanical scanning radar can be used to simultaneously achieve long-distance small target detection and high-precision target angle measurement. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 Schematic diagram of radar and difference beam antenna directions.
[0020] Figure 2 Cumulative sum-difference beam antenna patterns for continuously scanning radars.
[0021] Figure 3 It is a graph of the difference and ratio of the cumulative sum and difference beam antenna patterns. DETAILED DESCRIPTION
[0022] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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] The method of this embodiment specifically includes the following steps:
[0024] 1. Determine the antenna pattern G of the continuous scanning radar and the difference beam ∑ (θ) and G Δ (θ), θ∈(-2°,2°), such as Figure 1 shown.
[0025] 2. Determine the antenna rotation speed ω = 0.5° / s and the accumulation time Δt = 1s required for target detection, and calculate the accumulation angle Δθ = ωΔt = 0.5° required for target detection, which is less than the antenna width θ of the beam antenna pattern beam =1°.
[0026] 3. Determine the step value θ for the overlapped segmented integration process of the radar and difference beam antenna patterns step =0.002.
[0027] 4. According to the antenna pattern G of the radar sum and difference beam ∑ (θ) and G Δ(θ), θ∈(-2°,2°), the cumulative rotation angle Δθ=0.5° required for target detection and the step value θ of the overlapping segmented integration processing of the radar and difference beam antenna patterns step = 0.002° Calculate the cumulative sum difference beam antenna pattern G of the continuous scanning radar ∑ ′ (θ ‘ ) and G ′ Δ (θ ‘ ),like Figure 2 As shown, G ∑ ′ (θ ‘ ) and G ′ Δ (θ ‘ The specific calculation method of ) is as follows:
[0028]
[0029] Among them, θ1=θ'-Δθ, θ N =θ',θ i+1 -θ i =θ step =0.002°, θ'∈(-1.5°,2).
[0030] 5. Calculate the difference and ratio curve of the cumulative and difference beam antenna pattern of the continuous scanning radar: like Figure 3 shown.
[0031] 6. Calculate the cumulative sum of antenna and difference channel signals within the accumulated rotation angle Δθ of the target:
[0032]
[0033] Among them, θ'0 = -0.8° is the target's arrival direction, θ1 = θ'0 - Δθ = -1.3°, θ N =θ'0 = 0.8°,θ i+1 -θ i =θ step =0.002°.
[0034] 7. Calculate the ratio of the accumulated sum of antenna and difference channel signals And the target arrival direction θ'0 = -0.8° is obtained by looking up the table.
[0035] The present invention is not limited to the above specific implementations, and the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made to the above implementations based on the technical essence of the present invention shall be included in the protection scope of the present invention.
Claims
1. A method for measuring angles using a continuous scanning long-time integration radar, characterized in that: The continuous scanning radar cumulative sum difference beam antenna pattern is obtained by overlapping and segmented integration of the continuous scanning radar and difference beam antenna pattern, and the cumulative pattern is then used to achieve high-precision measurement of the target angle; specifically, the following steps are included: 1) Determine the antenna pattern G of the continuous scanning radar and the difference beam ∑ (θ) and G Δ (θ), θ∈(θ min ,θ max ); 2) Determine the rotation speed ω of the antenna and the accumulation time Δt required for target detection, and calculate the accumulation angle Δθ required for target detection = ωΔt. The accumulation angle Δθ required for target detection must be less than the antenna width θ of the beam antenna pattern. beam ; 3) Determine the step value θ of the overlapped segmented integration process of the radar and difference beam antenna patterns step , step value θ step Smaller than the radar's angular resolution θ res ; 4) According to the antenna pattern G of the radar sum and difference beam ∑ (θ) and G Δ (θ), the accumulated rotation angle Δθ required for target detection and the step value θ of the overlapped segmented integration process of the radar and difference beam antenna patterns step Calculate the cumulative sum difference beam antenna pattern G of the continuous scanning radar ∑ ′ (θ ‘ ) and G ′ Δ (θ ‘ ): where, θ1 = θ ‘ - Δθ, θ N = θ ‘ ,θ i$1 - θ i = θ step ,θ ‘ ∈(θ min + Δθ, θ max ); 5) Calculate the difference and ratio curve of the cumulative and difference beam antenna pattern of the continuous scanning radar: 6) Calculate the cumulative sum of antenna and difference channel signals within the accumulated rotation angle Δθ of the target: Among them, θ ’ , is the target’s arrival direction, θ1=θ ’ , -Δθ,θ N =θ ’ , ,θ i$1 -θ θ =θ step ; 7) Calculate the ratio of the accumulated sum of antenna and difference channel signals And look up the table to get the target's arrival direction θ ’ , .