Rainfall shielding target terahertz one-dimensional range image measuring device

Abstract

The present application relates to the technical field of distance measurement, and particularly relates to a rain-shielded target terahertz one-dimensional range image measuring device. The device comprises a rain channel, a terahertz radar, a target and a rotary table. The rain channel is an equal cross-section channel with a rectangular cross section, and the rain channel is provided with multiple rain devices. Each rain device comprises multiple spray heads arranged at intervals on the top of the rain channel, and the rain devices are connected in parallel and controlled separately. The terahertz radar is arranged outside the front end of the rain channel and on the central extension line of the front end surface. The target is arranged outside the rear end of the rain channel and on the central extension line of the rear end surface, and the target is placed on the rotary table and rotates with the rotary table. The distance between the terahertz radar and the target satisfies that the radar beam of the terahertz radar does not interfere with the rain channel and completely covers the target. The working condition of the terahertz radar in the rain environment can be effectively simulated, and the one-dimensional range image of the target under the rain curtain shielding can be obtained by using the terahertz radar.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of distance measurement, and particularly relates to a rain-shielded target terahertz one-dimensional range image measuring device. BACKGROUND

[0002] The terahertz radar uses terahertz waves as information carriers to realize detection of a target. Compared with a microwave radar, the terahertz radar has a short wavelength, a large bandwidth, and a very high space-time-frequency resolution, so that more accurate and higher frame rate detection of the position, speed and appearance of the target can be realized. Compared with a laser radar, the terahertz wave has a stronger ability to penetrate smoke, dust and sand.

[0003] However, the scattering and absorption of raindrops can seriously increase the transmission loss of the terahertz wave and reduce the detection performance of the terahertz radar. In order to realize the detection and application of the terahertz wave radar in a rain environment, the transmission characteristics of the terahertz wave in the rain environment must be studied in depth. SUMMARY

[0004] The purpose of the present application is to provide a rain-shielded target terahertz one-dimensional range image measuring device, which realizes the acquisition of the one-dimensional range image of the target under the rain curtain shield by using the terahertz radar.

[0005] In order to achieve the above purpose, the present application provides a rain-shielded target terahertz one-dimensional range image measuring device, which comprises:

[0006] The rain channel is an equal cross-section channel with a rectangular cross-section, and the rain channel is provided with multiple rain devices. Each rain device comprises multiple spray heads arranged at intervals on the top of the rain channel. The rain devices are connected in parallel and are individually controlled, and are used to adjust the rainfall.

[0007] The terahertz radar is arranged on the outside of the front end of the rain channel and located on the center extension line of the front end surface.

[0008] The target is arranged on the outside of the rear end of the rain channel and located on the center extension line of the rear end surface. The target is placed on a rotary table and can rotate with the rotary table.

[0009] The distance between the terahertz radar and the target satisfies that the radar beam of the terahertz radar does not interfere with the rain channel and completely covers the target.

[0010] Optionally, the elevation direction of the radar beam does not interfere with the rain channel, and the distance from the terahertz radar to the rear end surface of the rain channel satisfies:

[0011]

[0012] The azimuth direction of the radar beam does not interfere with the rain channel, and the distance from the terahertz radar to the rear end surface of the rain channel satisfies:

[0013]

[0014] Wherein, H is the height of the rainfall channel, W is the width of the rainfall channel, a1 is the elevation angle of the radar beam; a2 is the azimuth angle of the radar beam;

[0015] The distance from the terahertz radar to the back end surface of the rainfall channel is taken as the smaller value in {d 后1 , d 后2}.

[0016] Optionally, the target is a sphere.

[0017] The elevation direction of the radar beam completely covers the target, and the distance from the terahertz radar to the target satisfies:

[0018]

[0019] The azimuth direction of the radar beam completely covers the target, and the distance from the terahertz radar to the target satisfies:

[0020]

[0021] Wherein, R is the radius of the target, D is the distance from the terahertz radar to the target, and D=dfront+L+K+R, dfront is the distance from the terahertz radar to the front end surface of the rainfall channel, L is the distance from the front end surface to the back end surface of the rainfall channel, and K is the distance between the back end surface of the rainfall channel and the target;

[0022] Suppose that the elevation direction of the radar beam completely covers the target, the minimum distance dfront1 from the terahertz radar to the front end surface of the rainfall channel, and the azimuth direction of the radar beam

[0023] Completely covers the target, the minimum distance from the terahertz radar to the front end surface of the rainfall channel is dfront2, then:

[0024]

[0025] The distance from the terahertz radar to the front end surface of the rainfall channel is taken as the larger value in {d 前1 , d 前2}.

[0026] Optionally, a measuring cylinder for measuring rainfall is arranged in the rainfall channel, and the measuring cylinder is arranged below the rainfall area.

[0027] Optionally, the rainfall channel is a channel formed by an inverted U-shaped frame.

[0028] Optionally, each rainfall device further comprises a water pipe, a plurality of spray heads are arranged on the water pipe at intervals, a control valve is arranged on the water pipe, the water pipes of the rainfall devices are connected in parallel and connected with the outlet pipe of the water pump, and the water source is supplied to each water pipe through the water pump.

[0029] Optionally, the rainfall shielding target terahertz one-dimensional range image measuring device further comprises a controller, the valve is an electromagnetic valve, and the controller is connected with the water pump and the electromagnetic valve and used for controlling the water pump and the electromagnetic valve.

[0030] Optionally, a filter is arranged on the water outlet pipe.

[0031] The above technical scheme of the present application has the following advantages:

[0032] The rainfall shielding target terahertz one-dimensional range image measuring device provided by the present application comprises a rainfall channel, a terahertz radar, a target and a rotary table. The rainfall channel is an equisection channel with a rectangular cross section, and the rainfall channel is provided with multiple rainfall devices. Each rainfall device comprises multiple spray heads arranged at the top of the rainfall channel at intervals, and the multiple rainfall devices are connected in parallel and controlled individually. The terahertz radar is arranged outside the front end of the rainfall channel and located on the central extension line of the front end surface. The target is arranged outside the rear end of the rainfall channel and located on the central extension line of the rear end surface, and the target is placed on the rotary table and can rotate with the rotary table. The distance between the terahertz radar and the target satisfies that the radar beam of the terahertz radar does not interfere with the rainfall channel and completely covers the target. The working condition of the terahertz radar in a rainfall environment can be effectively simulated, and the one-dimensional range image of the target under a rain curtain shielding can be obtained by using the terahertz radar. BRIEF DESCRIPTION OF DRAWINGS

[0033] The drawings of the present application are provided for illustrative purposes only, and the proportions and quantities of the components in the drawings may not be consistent with the actual products.

[0034] Figure 1 FIG. 1 is a structural schematic diagram of a rainfall shielding target terahertz one-dimensional range image measuring device according to an embodiment of the present application;

[0035] Figure 2 FIG. 2 is a top view schematic diagram of the relationship between the terahertz radar and the rainfall channel according to the embodiment of the present application;

[0036] Figure 3 FIG. 3 is a structural schematic diagram of a rainfall channel according to the embodiment of the present application;

[0037] Figure 4 FIG. 4 is an enlarged schematic diagram of part A of FIG. 1; Figure 3

[0038] Figure 5 FIG. 5 is an enlarged schematic diagram of part B of FIG. 1; Figure 3

[0039] Figure 6 FIG. 6 is a one-dimensional range image of the target under no rain curtain shielding according to the embodiment of the present application;

[0040] Figure 7 ​​is a one-dimensional range image of a target in a rain screen shielding case in the embodiments of the present application.

[0041] In the figure:

[0042] 1: Rainfall channel;

[0043] 11: Spray head;

[0044] 12: Water pipe;

[0045] 13: Control valve;

[0046] 14: Water pump;

[0047] 15: Water source;

[0048] 16: Controller;

[0049] 17: Filter;

[0050] 18: Measuring cylinder;

[0051] 2: Terahertz radar;

[0052] 21: Radar beam;

[0053] 3: Target;

[0054] 4: Turntable. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0056] As shown in Figure 1 and Figure 2 The rain shielding target terahertz one-dimensional range image measuring device provided by the embodiments of the present application includes a rainfall channel 1, a terahertz radar 2, a target 3 and a turntable 4. The rainfall channel is placed between the terahertz radar 2 and the target 3, and is used to simulate the terahertz radar ISAR (Inverse-Synthetic-Aperture-Radar) turntable imaging under rain weather.

[0057] The rainfall channel 1 is an equal cross-section channel with a rectangular cross section. The rainfall channel 1 is provided with multiple rainfall devices. Each rainfall device includes multiple spray heads 11 arranged at intervals on the top of the rainfall channel 1. The multiple rainfall devices are connected in parallel and are individually controlled. One or more of the multiple rainfall devices can be opened to adjust the rainfall amount.

[0058] The terahertz radar 2 is arranged outside the front end of the rainfall channel 1 and on the central extension line of the front end face.

[0059] The target 3 is arranged outside the rear end of the rainfall channel 1 and on the central extension line of the rear end face, and the target 3 is placed on the turntable 4 and can rotate with the turntable 4.

[0060] It should be noted that the target 3 and the turntable 4 are prior art, for example, the target 3 is an angle reflector, and the turntable 4 is a rotating structure capable of rotating at a constant speed, which will not be described here.

[0061] The distance between the terahertz radar 2 and the target 3 satisfies that the radar beam 21 of the terahertz radar 2 does not interfere with the rainfall channel 1 and completely covers the target 3.

[0062] Referring to Figure 3 , in an example, the rainfall channel 1 is provided with a measuring cylinder 18 for measuring rainfall, and the measuring cylinder 18 is located below the rainfall area to collect precipitation and view the rainfall.

[0063] In an example, the rainfall channel 1 is a channel formed by an inverted U-shaped frame.

[0064] In an example, referring to Figures 3 to 5 , each rainfall device further comprises a water pipe 12, a plurality of spray heads 11 are arranged on the water pipe 12 at intervals, a control valve 13 is arranged on the water pipe 12, the water pipes 12 of each rainfall device are connected in parallel and connected to the outlet pipe of the water pump 14, and the water source 15 is supplied to each water pipe 12 through the water pump 14.

[0065] In order to improve the degree of automation, in an example, the rainfall shielding target terahertz one-dimensional range image measuring device further comprises a controller 16, the control valve 13 is an electromagnetic valve, and the controller 16 is connected with the water pump 14 and the electromagnetic valve for controlling the water pump 14 and the electromagnetic valve.

[0066] In order to avoid clogging the spray head 11, in an example, referring to Figure 5 , a filter 17 is arranged on the outlet pipe of the water pump 14.

[0067] In a preferred embodiment, the elevation direction of the radar beam 21 does not interfere with the rainfall channel 1, and the distance dback1 from the terahertz radar 2 to the rear end face of the rainfall channel 1 satisfies:

[0068]

[0069] The azimuth direction of the radar beam 21 does not interfere with the rainfall channel 1, and the distance dback2 from the terahertz radar 2 to the rear end face of the rainfall channel 1 satisfies:

[0070]

[0071] wherein H is the height of the rainfall channel, W is the width of the rainfall channel, and a1 is the elevation angle of the radar beam, and a2 is the azimuth angle of the radar beam;

[0072] The distance between the terahertz radar 2 and the back end surface of the rainfall channel 1 is taken as the smaller value in the set {d 后1 , d 后2}.

[0073] In a preferred embodiment, the target 3 is a sphere. The elevation direction of the radar beam 21 completely covers the target 3, and the distance D between the terahertz radar 2 and the target 3 satisfies:

[0074]

[0075] The azimuth direction of the radar beam 21 completely covers the target 3, and the distance D between the terahertz radar 2 and the target 3 satisfies:

[0076]

[0077] wherein R is the radius of the target, D is the distance between the terahertz radar and the target, and D = dfront + L + K + R, dfront is the distance between the terahertz radar and the front end surface of the rainfall channel, L is the distance between the front end surface and the back end surface of the rainfall channel, and K is the distance between the back end surface of the rainfall channel and the target.

[0078] Suppose that when the elevation direction of the radar beam 21 completely covers the target 3, the minimum distance between the terahertz radar 2 and the front end surface of the rainfall channel 1 is dfront1, and when the azimuth direction of the radar beam 21 completely covers the target, the minimum distance between the terahertz radar 2 and the front end surface of the rainfall channel 1 is dfront2, then

[0079]

[0080] The distance between the terahertz radar 2 and the front end surface of the rainfall channel 1 is taken as the larger value in the set {d 前1 , d 前2}.

[0081] In a specific embodiment, the size of the rainfall channel 1 is 5 m x 3 m x 3 m (length x width x height), the effective rainfall area is 1-30 m 2 , the effective rainfall height is 3 m, and three rainfall devices are used to control the rainfall intensity, with a continuous rainfall intensity range of 20-220 mm / h and a rainfall droplet size control range of 0.3-6 mm.

[0082] The frequency of the terahertz radar 2 is 220 GHz, and the width range of the radar beam 21 is 4.7° x 2.3° (azimuth angle x elevation angle). The positional relationship between the terahertz radar 2 and the rainfall channel 1 is as shown in Figure 2As shown, since the radar view is directly onto the rain channel 1, the distance selection factor of the terahertz radar 2 to the target 3 is only related to the radar beam 21 width and the size of the rain channel 1. Referring to Figure 1 and Figure 2 As shown, in order to select a suitable distance of the terahertz radar 2 to the back end surface of the rain channel, neither the horizontal beam nor the vertical beam hits the rain channel 1, that is,

[0083] Pitch direction:

[0084]

[0085] Azimuth direction:

[0086]

[0087] The distance of the terahertz radar 2 to the back end surface of the rain channel 1 is selected as the smaller value in {d 后1 , d 后2}.

[0088] The distance of the terahertz radar 2 to the back end surface of the rain channel 1 is d 前 + L

[0089] In an ideal case, d 前 + L is limited by the horizontal beam width, and d 前 + L≤36.5m, that is, d 前 ≤31.5m.

[0090] At the same time, the radar beam 21 covering the target 3 needs to meet the following conditions at the same time:

[0091] Pitch direction:

[0092]

[0093] Azimuth direction:

[0094]

[0095] Then:

[0096]

[0097]

[0098] Substituting L=5, K=1, and R=0.5, we have:

[0099] d 前1 ≥18.4m

[0100] d 前2 ≥5.7m

[0101] The distance of the terahertz radar to the front end surface of the rain channel is d前 Take {d 前1 , d 前2} in

[0102] The value of d 前 ≥18.4m.

[0103] In summary, the distance d 前 from the radar to the front end of the gantry should satisfy 18.4m≤d 前 ≤31.5m.

[0104] It is worth mentioning that in actual cases, it is not strictly according to the horizontal and vertical beams not to hit the rain channel 1, and the value range of d 前 may be appropriately relaxed, as long as the test results are within an acceptable range.

[0105] In an example, according to the radar beam width, the size of the rain channel, the distance between the terahertz radar and the target is determined, for example, the target 3 is placed at a distance of about 50m from the terahertz radar, and the target 3 is placed on the turntable 4 to set a uniform speed rotation, and the terahertz radar 2 is used to measure the echo of the target 3, and after data processing, a one-dimensional range image of the target 3 can be obtained. It should be noted that the one-dimensional range image of the target obtained by data processing is prior art, and will not be described here. See Figure 6 and Figure 7 show the one-dimensional range image of the target under the condition of no rain curtain shielding and rain curtain shielding, respectively, and it can be seen from the comparison that the rain has a greater impact on the amplitude of the signal, and the target is at 50.26m.

[0106] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that not every example contains only one independent technical solution, and in the absence of solution conflicts, each technical feature mentioned in each example can be combined in any way to form other embodiments that can be understood by those skilled in the art.

[0107] In addition, without departing from the scope of the present application, the technical solutions described in the foregoing examples are modified, or some of the technical features are replaced, without changing the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A rainfall-shielded target terahertz one-dimensional range profile measurement apparatus, characterized by, The device comprises: a rainfall channel, which is a rectangular cross-section channel, and is provided with multiple rainfall devices, each of which comprises multiple spray heads arranged at intervals on the top of the rainfall channel, and each of which is connected in parallel with the others and controlled independently to adjust the rainfall amount; a terahertz radar, which is arranged outside the front end of the rainfall channel and on the central extension line of the front end surface; a target, which is arranged outside the rear end of the rainfall channel and on the central extension line of the rear end surface, and is placed on a turntable and can rotate with the turntable; the distance between the terahertz radar and the target satisfies the condition that the radar beam of the terahertz radar does not interfere with the rainfall channel and completely covers the target; the elevation direction of the radar beam does not interfere with the rainfall channel, and the distance from the terahertz radar to the rear end surface of the rainfall channel satisfies the condition that: the azimuth direction of the radar beam does not interfere with the rainfall channel, and the distance from the terahertz radar to the rear end surface of the rainfall channel satisfies the condition that: wherein, H is the height of the rainfall channel, W is the width of the rainfall channel, is the elevation angle of the radar beam; is the azimuth angle of the radar beam; The distance of the terahertz radar to the back end surface of the rain channel is taken as a parameter In a small value.

2. The device for measuring the terahertz one-dimensional range image of a rainfall-shielded target according to claim 1, wherein: the target is a sphere; the elevation direction of the radar beam completely covers the target, and the distance from the terahertz radar to the target satisfies the condition that: the azimuth direction of the radar beam completely covers the target, and the distance from the terahertz radar to the target satisfies the condition that: where R is the radius of the target, D is the distance of the terahertz radar to the target, and D= +L+K+R , is the distance of the terahertz radar to the front end face of the rain channel, L is the distance of the front end face to the rear end face of the rain channel, and K is the distance between the rear end face of the rain channel and the target. Assuming the radar beam's elevation coverage of the target is complete, the minimum distance of the terahertz radar to the front end face of the rain channel is , the radar beam's azimuth coverage of the target is complete, the minimum distance of the terahertz radar to the front end face of the rain channel is then: The distance from the terahertz radar to the front end face of the rainfall channel is taken as The largest value in the range.

3. The rainfall-shielded target terahertz one-dimensional range profile measurement apparatus according to claim 1, characterized by: a measuring cylinder for measuring the rainfall amount is arranged in the rainfall channel below the rainfall area.

4. The rainfall-shielded target terahertz one-dimensional range profile measurement apparatus according to claim 1, characterized by: The rainfall channel is a channel formed by an inverted U-shaped frame.

5. The rainfall-shielded target terahertz one-dimensional range profile measurement apparatus according to claim 4, characterized by: Each of the rainfall devices further comprises a water pipe, on which the multiple spray heads arranged at intervals are mounted, and the water pipe is provided with a control valve, the water pipes of the rainfall devices are connected in parallel and connected to the outlet pipe of a water pump, and the water pump supplies water from a water source to each of the water pipes.

6. The rainfall-shielded target terahertz one-dimensional range profile measurement apparatus according to claim 5, characterized by: The device further comprises a controller, the control valve is an electromagnetic valve, and the controller is connected to the water pump and the electromagnetic valve to control the water pump and the electromagnetic valve.

7. The rainfall-shielded target terahertz one-dimensional range profile measurement apparatus according to claim 5, characterized by: The outlet pipe is provided with a filter.

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