A strip collection imaging radar collection model calculation method, device and storage medium

Abstract

The application discloses a strip collection imaging radar collection model calculation method, comprising the following steps: step 1, inputting device parameters and collection parameters; step 2, calculating a strip coverage area; step 3, calculating a ground wiping angle; step 4, calculating a beam coverage area; step 5, calculating a ground projection distance from a beam center point to a collection platform; step 6, calculating an included angle between a target point and a collection starting point; step 7, calculating an included angle between the target point and a collection ending point; step 8, calculating a distance between the target point and a collection point; step 9, calculating a collection starting point longitude, a collection starting point latitude and the like; and step 10, calculating a constraint condition, judging whether the strip coverage area is in the beam coverage range. The method disclosed by the application specifically designs key steps in model calculation, and can automatically generate the model.

Description

Technical Field

[0001] This invention belongs to the field of radar parameter design and data acquisition, and specifically relates to a method, device and storage medium for calculating the acquisition model of a strip acquisition imaging radar. Background Technology

[0002] Airborne Synthetic Aperture Radar (SAR) has a wide range of applications, from military reconnaissance to civilian mapping. However, there are currently no mature methods for designing acquisition models for airborne SAR; most acquisition schemes and parameters are planned based on experience or flight tests. Summary of the Invention

[0003] The technical problem to be solved by this invention is to provide a method, device and storage medium for calculating the acquisition model of a strip acquisition imaging radar. It can complete the calculation of acquisition parameters according to the design parameters of different radars, and adjust the ground angle according to the actual situation of the strip coverage area, and obtain the latitude and longitude coordinates of the starting point of the acquisition route, so as to achieve the standardized design of the acquisition model.

[0004] The present invention adopts the following technical solution:

[0005] An improved method for calculating the acquisition model of a strip acquisition imaging radar includes the following steps:

[0006] Step 1, input device parameters and acquisition parameters:

[0007] Equipment parameters include beamwidth, sampling gate, sampling frequency, and pulse width; acquisition parameters include flight altitude and center point percentage.

[0008] Step 2, calculate the strip coverage area:

[0009] First, calculate the angle α1 between the starting point of the data collection and the horizon:

[0010]

[0011] In the above formula, h is the flight altitude, st is the sampling gate, and c is the speed of light;

[0012] Next, calculate the angle α2 between the data acquisition termination point and the horizon:

[0013]

[0014] In the above formula, pw is the pulse width;

[0015] The length of the strip coverage area is:

[0016] h×(tanα2)-h×(tanα1)

[0017] Step 3, calculate the rubbing angle α3:

[0018] First, calculate the length of line segment l1:

[0019]

[0020] Then calculate the length of line segment l2:

[0021]

[0022] Finally, calculate the ground rub angle α3:

[0023]

[0024] Step 4, calculate the beam coverage area:

[0025] First, calculate the near-end angle α4 of the beam:

[0026]

[0027] In the above formula, θ is the beamwidth;

[0028] Then calculate the beam's far-end angle α5:

[0029] α5=α4-θ

[0030] Step 5, calculate the ground projection distance l3 from the beam center point to the acquisition platform:

[0031]

[0032] Step 6, calculate the angle α6 between the target point and the starting point of data acquisition:

[0033]

[0034] In the above formula, l4 is half the length of the flight path, α 0ff Step 7: Calculate the angle α7 between the target point and the end point of data acquisition, representing the offset angle between the flight path and due north.

[0035]

[0036] Step 8, calculate the distance l5 between the target point and the acquisition point:

[0037]

[0038] Step 9, calculate the longitude Lat of the data collection starting point. start Lon, the latitude of the starting point for data collection start Longitude of the endpoint of data collection (Lat) end, the latitude of the acquisition termination point Lon end :

[0039]

[0040] In the above formula, R is the radius of the earth, Lαt target is the longitude of the measured target, Lon target is the latitude of the measured target;

[0041] Step 10, constraint condition calculation, determine whether the strip coverage area is within the beam coverage range:

[0042] Compare the length relationships of l1, l2 with the near and far ends of the beam. If l1 > h×tanα4 and l2 < h×tanα5, then the model is established.

[0043] An acquisition model calculation device for a strip acquisition imaging radar, the improvement lies in including: a processor; a memory, in which executable instructions of the processor are stored; wherein, the processor is configured to execute the steps of the above method by executing the executable instructions.

[0044] A computer-readable storage medium for storing a program, the improvement lies in that when the program is executed, the steps of the above method are implemented.

[0045] The beneficial effects of the present invention are:

[0046] The method disclosed by the present invention specifically designs the key steps in model calculation, can complete the automatic generation of the model; can divide the strip coverage area according to the actual acquisition situation, can meet the design needs of different scenarios; can automatically judge the effectiveness of the model, improve the planning efficiency; can provide accurate acquisition coordinate points for actual acquisition operations, and solve the problem of inaccurate acquisition coordinate calculation in the actual operation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a flow schematic diagram of the method of the present invention;

[0048] Figure 2 is a schematic diagram of the acquisition model;

[0049] Figure 3 is the strip coverage area of the acquisition model at a height of 300m;

[0050] Figure 4 is the grazing angle of the acquisition model at a height of 300m;

[0051] Figure 5 is the beam coverage area of the acquisition model at a height of 300m;

[0052] Figure 6It refers to the angle and distance between the acquisition points of the model at a height of 300m;

[0053] Figure 7 It includes the calculated coordinates and model output of the model collected at a height of 300m;

[0054] Figure 8 It is the strip coverage area of ​​the model collected at a height of 500m;

[0055] Figure 9 It is the ground-touching angle of the model collected at a height of 500m;

[0056] Figure 10 It is the beam coverage area of ​​the model acquired at a height of 500m;

[0057] Figure 11 It refers to the angle and distance between the acquisition points of the model at a height of 500m;

[0058] Figure 12 It contains the calculated coordinates and model output of the model collected at a height of 500m. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0060] Example 1 discloses a method for calculating the acquisition model of a strip acquisition imaging radar, such as... Figure 1 As shown, it includes the following steps:

[0061] Step 1, input device parameters and acquisition parameters:

[0062] Equipment parameters include beamwidth, sampling gate, sampling frequency, and pulse width; acquisition parameters include flight altitude and center point percentage.

[0063] Step 2, calculate the strip coverage area:

[0064] The lengths of the hypotenuse at the start and end of the acquisition are calculated based on the input sampling gate and pulse width, and the length of the strip coverage area (i.e., the strip width) is calculated in combination with the flight altitude parameters.

[0065] like Figure 2 As shown, first calculate the angle α1 between the starting point of the data collection and the horizon:

[0066]

[0067] In the above formula, h is the flight altitude, st is the sampling gate, and c is the speed of light;

[0068] Next, calculate the angle α2 between the data acquisition termination point and the horizon:

[0069]

[0070] In the above formula, pw is the pulse width;

[0071] The length of the strip coverage area is:

[0072] h×(tanα2)-h×(tanα1)

[0073] Step 3, calculate the rubbing angle α3:

[0074] The main task is to calculate the projected position of the beam center point on the ground, which requires combining the calculation results from step 2 with the input percentage and flight altitude.

[0075] like Figure 2 As shown, first calculate the length of line segment l1:

[0076]

[0077] Then calculate the length of line segment l2:

[0078]

[0079] Finally, calculate the ground rub angle α3:

[0080]

[0081] Step 4, calculate the beam coverage area:

[0082] The beam coverage area is mainly calculated by measuring the projection points at the near and far ends of the beam.

[0083] like Figure 2 As shown, the near-end angle α4 of the beam is first calculated:

[0084]

[0085] In the above formula, θ is the beamwidth;

[0086] Then calculate the beam's far-end angle α5:

[0087] α5=α4-θ

[0088] Step 5, as follows Figure 2 As shown, calculate the ground projection distance l3 from the beam center point to the acquisition platform:

[0089]

[0090] Step 6, as follows Figure 2 As shown, calculate the angle α6 between the target point and the starting point of the data acquisition:

[0091]

[0092] In the above formula, l4 is half of the route length, and α 0ff is the offset angle between the route and the due north direction;

[0093] Step 7, calculate the included angle α7 between the target point and the acquisition termination point:

[0094]

[0095] Step 8, calculate the distance l5 between the target point and the acquisition point:

[0096]

[0097] Step 9, calculate the longitude Lat start , latitude Lon start of the acquisition starting point, longitude Lat end , latitude Lon end of the acquisition termination point:

[0098]

[0099] In the above formula, R is the radius of the earth, and Lαt target is the longitude of the measured target, and Lon target is the latitude of the measured target;

[0100] Step 10, calculate the constraint conditions and determine whether the strip coverage area is within the beam coverage range:

[0101] Compare the relationships between l1, l2 and the lengths of the proximal and distal ends of the beam. If l1 > h×tanα4 and l2 < h×tanα5, then the model holds.

[0102] The plane distance conversion calculation mainly realizes the calculation of the plane distance and relative angle between the starting and ending coordinate points of the route and the target point; the calculation of the starting and ending coordinate points of the route can provide accurate acquisition coordinate points for actual acquisition operations.

[0103] Output of the acquisition model:

[0104] α3, Lat start ​​​​​​​​​​​​​​It is the beam coverage area of ​​the model acquired at a height of 300m; Figure 6 It refers to the angle and distance between the acquisition points of the model at a height of 300m; Figure 7 It is the calculated coordinates and model output of the model collected at a height of 300m.

[0106] Figure 8 It is the strip coverage area of ​​the model collected at a height of 500m; Figure 9 It is the ground-touching angle of the model collected at a height of 500m; Figure 10 It is the beam coverage area of ​​the model acquired at a height of 500m; Figure 11 It refers to the angle and distance between the acquisition points of the model at a height of 500m; Figure 12 It contains the calculated coordinates and model output of the model collected at a height of 500m.

[0107] This embodiment also discloses a data acquisition model calculation device for a strip acquisition imaging radar, comprising: a processor; and a memory storing executable instructions of the processor; wherein the processor is configured to perform the steps of the above method by executing the executable instructions.

[0108] This embodiment also discloses a computer-readable storage medium for storing a program that, when executed, implements the steps of the above method.

Claims

1. A method for calculating the acquisition model of a strip acquisition imaging radar, characterized in that, It includes the following steps: Step 1, input device parameters and acquisition parameters: The device parameters include beam width, sampling gate, sampling frequency, and pulse width, and the acquisition parameters include flight altitude and center point ratio; Step 2, calculate the strip coverage area: First, calculate the angle α1 between the acquisition starting point and the horizon: In the above formula, h is the flight altitude, st is the sampling gate, and c is the speed of light; Then, calculate the angle α2 between the acquisition ending point and the horizon: In the above formula, pw is the pulse width; The length of the strip coverage area is: h×(tanα2)-h×(tanα1) Step 3, calculate the grazing angle α3: First, calculate the length of line segment l1: Then, calculate the length of line segment l2: Finally, calculate the grazing angle α3: Step 4, calculate the beam coverage area: First, calculate the beam proximal angle α4: In the above formula, θ is the beam width; Then, calculate the beam distal angle α5: α5 = α4 - θ Step 5, calculate the distance l3 from the beam center point to the ground projection of the acquisition platform: Step 6, calculate the angle α6 between the target point and the acquisition starting point: In the above formula, l4 is half the length of the flight path, α 0ff This is the offset angle between the flight path and true north. Step 7, calculate the angle α7 between the target point and the acquisition ending point: Step 8, calculate the distance l5 between the target point and the acquisition point: Step 9, calculate the longitude Lat of the data collection starting point. start Lon, the latitude of the starting point for data collection start Longitude of the endpoint of data collection (Lat) end Latitude of the collection termination point Lon end : In the above formula, R is the Earth's radius, and Lαt target For the longitude and Lon of the target being measured target The latitude of the target being measured; Step 10, calculate the constraint conditions, and determine whether the strip coverage area is within the beam coverage range: Compare the length relationships of l1, l2 with the proximal and distal ends of the beam. If l1 > h×tanα4 and l2 < h×tanα5, then the model holds.

2. A data acquisition model calculation device for a strip acquisition imaging radar, characterized in that, It includes: A processor; a memory storing executable instructions of the processor; wherein, the processor is configured to execute the steps of the method according to claim 1 by executing the executable instructions.

3. A computer-readable storage medium for storing a program, characterized in that, When the program is executed, it implements the steps of the method according to claim 1.

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