Low-cost horizon field design method

Abstract

The invention belongs to the technical field of radar target scattering characteristic measurement, and particularly relates to a low-cost horizon field design method. The method comprises the following steps: constructing a horizon field target radar scattering characteristic measurement model; according to the horizon field target radar scattering characteristic measurement model, the minimum sweeping area width is calculated; and carrying out field design of the horizon field according to the minimum sweeping area width. According to the low-cost horizon field design method, the horizon field target radar scattering characteristic measurement model is constructed, the minimum cleaning area width of the horizon field is calculated according to the horizon field measurement parameters, the field leveling area is optimized, the field clutter interference is reduced, and the measurement efficiency is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of radar target scattering characteristic measurement, and in particular relates to a low-cost flat-field site design method. Background Art

[0002] Measuring the radar scattering characteristics of targets in a flat-field environment requires exploiting the multipath effect of electromagnetic waves. Therefore, the test area must be free of clutter and the ground's electromagnetic wave reflection area must be flat. If the test area is uneven or contains debris, such as snow, it must be cleared. However, given the electromagnetic wave propagation path, clearing only the ground's electromagnetic wave reflection area will meet the flat-field testing requirements.

[0003] When clearing the site during the measurement of radar scattering characteristics of current horizontal field targets, it is usually impossible to accurately calculate the minimum clearing area, resulting in waste of resources due to excessive clearing, making it difficult to dynamically adapt to complex environments, and affecting measurement accuracy and economy.

[0004] Therefore, it is desired to have a technical solution to overcome or at least alleviate at least one of the above-mentioned deficiencies of the prior art. Summary of the Invention

[0005] The purpose of this application is to provide a low-cost ground leveling site design method to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is:

[0007] A low-cost flat field site design method, comprising:

[0008] Construct a model for measuring radar scattering characteristics of horizontal field targets;

[0009] Calculating the minimum sweeping area width based on the horizontal field target radar scattering characteristic measurement model;

[0010] The site design of the ground leveling field is carried out according to the minimum cleaning area width.

[0011] In at least one embodiment of the present application, the horizon target radar scattering characteristic measurement model includes:

[0012] a target, wherein the target is mounted on the ground via a target bracket;

[0013] A mobile test platform, wherein the mobile test platform is mounted on a scanning vehicle and an antenna is mounted on the mobile test platform. The scanning vehicle drives the mobile test platform to move along the outer edge of the cleaning area. The path of the electromagnetic wave emitted by the antenna to reach the target includes a direct path and an indirect path reflected by the ground;

[0014] The outer side of the target forms a ring-shaped main reflection area, and the main reflection area is located inside the cleaning area. The cleaning area is a circular area with the center of the target as the center and the test distance as the radius.

[0015] In at least one embodiment of the present application, there is no clutter source inside the cleaning area.

[0016] In at least one embodiment of the present application, the ground roughness of the main reflection area is less than 3 cm.

[0017] In at least one embodiment of the present application, calculating the minimum sweeping area width according to the horizontal field target radar scattering characteristic measurement model includes:

[0018] Determine the antenna height corresponding to different electromagnetic wave frequencies;

[0019] Calculate the starting reflection position of the main reflection area at different antenna heights:

[0020]

[0021] Calculate the end reflection position of the main reflection area at different antenna heights:

[0022]

[0023] The minimum value of the starting reflection position and the maximum value of the ending reflection position under different antenna heights are selected to calculate the width of the main reflection area:

[0024] d=L2-L1

[0025] Among them, H a is the antenna height, H t is the target height, R t is the test distance, D is the maximum longitudinal size of the target, L1 is the distance from the outer edge of the cleaning area to the outer edge of the main reflection area, L2 is the distance from the outer edge of the cleaning area to the inner edge of the main reflection area, and d is the width of the main reflection area;

[0026] The width of the main reflection area is the minimum cleaning area width.

[0027] In at least one embodiment of the present application, the antenna height, the target height, and the test distance satisfy a flat-field-elevated formula.

[0028] The invention has at least the following beneficial technical effects:

[0029] The low-cost flat field site design method of this application constructs a flat field target radar scattering characteristic measurement model, calculates the minimum flat field clearing area width based on the flat field measurement parameters, optimizes the site leveling area, reduces site clutter interference, and improves measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a front view of a model for measuring radar scattering characteristics of a horizontal field target according to one embodiment of the present application;

[0031] Figure 2 This is a top view of a model for measuring radar scattering characteristics of a horizontal field target according to one embodiment of the present application. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of this application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain this application, and should not be understood as limitations on this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of this application are described in detail below in conjunction with the drawings.

[0033] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as limiting the scope of protection of this application.

[0034] The following is combined with Figures 1 to 2 This application is described in further detail.

[0035] This application provides a low-cost ground leveling site design method, comprising the following steps:

[0036] Construct a model for measuring radar scattering characteristics of horizontal field targets;

[0037] Calculate the minimum sweeping area width based on the radar scattering characteristics measurement model of the horizontal field target;

[0038] The site design of the ground leveling field is carried out according to the minimum cleaning area width.

[0039] The low-cost horizontal field site design method of this application first constructs a horizontal field target radar scattering characteristic measurement model. Figure 1 As shown in the figure, the ground-level target radar scattering characteristic measurement model includes a target and a mobile test platform. The target is installed on the ground through a target bracket. The target height is H t The mobile test platform is installed on the scanning vehicle. The mobile test platform is equipped with an antenna with a height of H. a The antenna height has a certain relationship with the frequency of the electromagnetic wave. The scanning vehicle drives the mobile test platform to move along the outer edge of the cleaning area. The path of the electromagnetic wave emitted by the antenna to the target includes a direct path and an indirect path reflected by the ground. The outer side of the target forms a circular main reflection area, and the main reflection area is located inside the cleaning area. The cleaning area is a circle with the center of the target as the center and the test distance R t The circular area with radius .

[0040] In the preferred embodiment of this application, to ensure that the environmental background level meets the test requirements, the cleaning area is required to be free of clutter sources. In engineering, the main reflection area is generally required to have a ground roughness of less than 3cm. Generally, airport runways or aprons can meet the test site requirements.

[0041] The low-cost flat-field site design method of this application calculates the minimum sweeping area width based on the flat-field target radar scattering characteristic measurement model, specifically including:

[0042] Determine the antenna height corresponding to different electromagnetic wave frequencies;

[0043] Calculate the starting reflection position of the main reflection area at different antenna heights:

[0044]

[0045] Calculate the end reflection position of the main reflection area at different antenna heights:

[0046]

[0047] Select the minimum value of the starting reflection position and the maximum value of the ending reflection position at different antenna heights to calculate the width of the main reflection area:

[0048] d=L2-L1

[0049] Among them, H a is the antenna height, H t is the target height, R t is the test distance, D is the maximum longitudinal size of the target, L1 is the distance from the outer edge of the cleaning area to the outer edge of the main reflection area, L2 is the distance from the outer edge of the cleaning area to the inner edge of the main reflection area, and d is the width of the main reflection area;

[0050] The width of the main reflection area is the minimum cleaning area width. It can be understood that the minimum cleaning area width means the cleaning area radius R t The minimum value range is the outer edge of the main reflection area.

[0051] In the low-cost flat-field site design method of the present application, the antenna height, target height and test distance satisfy the flat-field elevated formula.

[0052] In one embodiment of the present application, for a target with a maximum longitudinal dimension D of 17m, the test distance is 40m. In order to suppress the interference of ground multipath clutter on the test, the ground plane field principle is adopted to synthesize the direct wave and the ground multipath clutter to ensure that the field strength gain in the target area is maximized. The layout diagram of the ground plane field target radar scattering characteristics measurement model is as follows: Figure 2 shown.

[0053] Furthermore, to avoid frequent target placement during omnidirectional SAR testing, a circular clearing area must be maintained. Table 1 shows the starting and ending reflection positions of the main reflection area for different bands at a test distance of 40m and a target height of 2.5m.

[0054] Table 1

[0055]

[0056] It can be concluded from the table that the width of the main reflection area decreases with the increase of frequency. The minimum value of the starting reflection position of the main reflection area is L1=0.86m, and the maximum value of the ending reflection position of the main reflection area is L2=15.46m. In order to meet the broadband test requirements of the whole machine, the minimum cleaning area width is about 15m, that is, at least a ground flat field paving condition of about 15m needs to be guaranteed.

[0057] This application proposes a low-cost horizontal field site design method that constructs a horizontal field target radar scattering characteristic measurement model. Based on the horizontal field measurement parameters, the minimum horizontal field clearance area width is accurately calculated. This minimum clearance area is optimized to ensure a flat, obstacle-free surface within the area, minimizing measurement errors caused by uneven surfaces or obstructions. Through reasonable layout and planning, the impact of clutter on the measurement signal is reduced. This application balances the clearance range with resource utilization, avoiding unnecessary waste of resources due to excessive cleaning, ensuring efficient and economical measurement, and improving the accuracy and reliability of horizontal field measurements. This method can effectively enhance measurement efficiency and provide more robust data support for subsequent scientific research or engineering applications.

[0058] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A low-cost ground leveling site design method, characterized in that: include: Construct a model for measuring radar scattering characteristics of horizontal field targets; Calculating the minimum sweeping area width based on the horizontal field target radar scattering characteristic measurement model; The site design of the ground leveling field is carried out according to the minimum cleaning area width.

2. The low-cost ground leveling site design method according to claim 1, characterized in that: The horizontal field target radar scattering characteristic measurement model includes: a target, wherein the target is mounted on the ground via a target bracket; A mobile test platform, wherein the mobile test platform is mounted on a scanning vehicle and an antenna is mounted on the mobile test platform. The scanning vehicle drives the mobile test platform to move along the outer edge of the cleaning area. The path of the electromagnetic wave emitted by the antenna to reach the target includes a direct path and an indirect path reflected by the ground; The outer side of the target forms a ring-shaped main reflection area, and the main reflection area is located inside the cleaning area. The cleaning area is a circular area with the center of the target as the center and the test distance as the radius.

3. The low-cost ground leveling site design method according to claim 2, characterized in that: There is no clutter source inside the cleaning area.

4. The low-cost ground leveling site design method according to claim 3, characterized in that: The ground unevenness of the main reflection area is less than 3 cm.

5. The low-cost ground leveling site design method according to claim 4, characterized in that: Calculate the minimum sweeping area width based on the horizontal field target radar scattering characteristic measurement model, including: Determine the antenna height corresponding to different electromagnetic wave frequencies; Calculate the starting reflection position of the main reflection area at different antenna heights: Calculate the end reflection position of the main reflection area at different antenna heights: The minimum value of the starting reflection position and the maximum value of the ending reflection position under different antenna heights are selected to calculate the width of the main reflection area: d=L2-L1 Among them, H a is the antenna height, H t is the target height, R t is the test distance, D is the maximum longitudinal size of the target, L1 is the distance from the outer edge of the cleaning area to the outer edge of the main reflection area, L2 is the distance from the outer edge of the cleaning area to the inner edge of the main reflection area, and d is the width of the main reflection area; The width of the main reflection area is the minimum cleaning area width.

6. The low-cost ground leveling site design method according to claim 5, characterized in that: The antenna height, the target height, and the test distance satisfy a horizontal-field-elevated formula.

Images