A system for obtaining multi-dimensional visualization analysis diagrams of SAR detection capabilities

Abstract

The present invention discloses a system for obtaining a multidimensional visualization analysis chart of SAR detection capability. This system, belonging to the field of SAR detection technology, addresses the problem in the prior art that radar detection capability can only be analyzed through data, hindering operators from intuitively understanding the radar's detection capabilities. In this system, a data calculation unit is used to calculate the ground reflection coefficient matrix, range resolution matrix, and azimuth resolution matrix corresponding to grid points. A threshold comparison unit receives the range resolution matrix, azimuth resolution matrix, and ground reflection coefficient matrix and compares them with the threshold ranges for range resolution, azimuth resolution, and ground reflection coefficient stored in the threshold comparison unit. Multiple grid points that simultaneously meet the range resolution, azimuth resolution, and ground reflection coefficient requirements are obtained and sent to a graphical display unit for display as a two-dimensional analysis chart. This system can be used to obtain a two-dimensional analysis chart of radar elastic capability.

Description

Technical Field

[0001] The present invention belongs to the technical field of SAR detection, and in particular relates to a system for acquiring a multi-dimensional visual analysis diagram of SAR detection capability. Background Art

[0002] SAR (Synthetic Aperture Radar) is an active earth observation system that can be installed on aircraft, satellites, spacecraft and other flying platforms to conduct earth observations around the clock and in all weather conditions, and has a certain surface penetration capability.

[0003] To meet the increasing demand for high-precision detection, it is necessary to know the radar's detection capabilities before actual detection. However, radar detection capabilities can currently only be analyzed through data, which is not intuitive and does not help operators intuitively understand the radar's detection capabilities. Summary of the Invention

[0004] In view of the above analysis, the present invention aims to provide a system for obtaining a multi-dimensional visual analysis diagram of SAR detection capability, which solves the problem in the prior art that radar detection capability can only be analyzed through data, which is not conducive to the operator's intuitive understanding of the radar's detection capability.

[0005] The purpose of the present invention is mainly achieved through the following technical solutions:

[0006] The present invention provides a system for acquiring a multi-dimensional visual analysis diagram of SAR detection capability, comprising a data calculation unit, a threshold comparison unit and a graphical display unit; the data calculation unit is used to determine the ground beam coverage range, and obtain a grid point coordinate matrix within the beam coverage range, and calculate a ground reflection coefficient matrix, a range resolution matrix and an azimuth resolution matrix corresponding to the grid points at different distance resolutions; the threshold comparison unit receives the range resolution matrix, the azimuth resolution matrix and the ground reflection coefficient matrix and compares them with the threshold range of the distance resolution, the threshold range of the azimuth resolution and the threshold range of the ground reflection coefficient stored in the threshold comparison unit, respectively, to obtain a plurality of grid points that simultaneously meet the range resolution, the azimuth resolution and the ground reflection coefficient, and send them to the graphical display unit to display a two-dimensional analysis diagram.

[0007] Furthermore, it also includes a memory for storing the data calculation unit, the threshold comparison unit and the imaging display unit.

[0008] Furthermore, it also includes a shell, and the memory is arranged in the shell.

[0009] Furthermore, the memory is detachably connected to the housing.

[0010] Furthermore, the memory is connected to the shell through a buffer.

[0011] Furthermore, the buffer component includes a first arc-shaped rod, a connecting pipe and a second arc-shaped rod connected in sequence; and the memory is arranged on the connecting pipe.

[0012] Furthermore, one end of the first arc rod is slidably connected to one end of the second arc rod through a connecting tube, and the other end of the first arc rod and the other end of the second arc rod are connected to the housing.

[0013] Furthermore, one end of the connecting tube is sleeved on the outer wall of the first arc-shaped rod, and the other end of the connecting tube is sleeved on the outer wall of the second arc-shaped tube; and limiting pieces are provided between the connecting tube and the first arc-shaped rod and between the connecting tube and the second arc-shaped rod.

[0014] Furthermore, the limiting member includes an outer ring provided on the outer walls of the first arc rod and the second arc rod and an inner ring provided on the inner wall of the connecting tube. The outer ring is a rigid ring and the inner ring is an elastic ring. The inner diameter of the inner ring is smaller than the outer diameter of the outer ring.

[0015] Furthermore, the inner diameters of the plurality of inner rings gradually decrease in a direction approaching the midpoint of the connecting pipe.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0017] The system for obtaining a multi-dimensional visualization analysis diagram of SAR detection capability provided by the present invention comprehensively calculates and screens indicators such as range resolution, azimuth resolution, and ground reflection coefficient, which were previously calculated separately, to meet the needs of radar detection capability analysis. It presents the radar capability boundary in multiple dimensions through two-dimensional images, maps the position, three-dimensional speed, and three-dimensional posture of the carrier to multiple dimensions such as the radar's effective range, oblique angle, and off-axis angle, and provides the distribution characteristics of the resolution within the ground beam coverage range, thereby more intuitively demonstrating the radar detection capability and facilitating operators' intuitive understanding of the radar's detection capability.

[0018] Other features and advantages of the present invention will be described in the following description, and part of them will become obvious from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

[0020] Figure 1 A schematic diagram of the connection between the memory and the housing in the system for obtaining a multi-dimensional visual analysis diagram of SAR detection capability provided in the first embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the connection between the first arc rod and the connecting rod in the system for obtaining the multi-dimensional visual analysis diagram of SAR detection capability provided in the first embodiment of the present invention.

[0022] Reference numerals:

[0023] 1-housing; 2-memory; 3-first arc-shaped rod; 4-second arc-shaped rod; 5-connecting tube; 6-outer ring; 7-first inner ring; 8-second inner ring; 9-baffle. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used to explain the principles of the present invention together with the embodiments of the present invention.

[0025] Example 1

[0026] This embodiment provides a system for obtaining a multi-dimensional visual analysis chart of SAR detection capability, including a data calculation unit, a threshold comparison unit, and a graphical display unit;

[0027] The data calculation unit is used to determine the ground beam coverage range, obtain the grid point coordinate matrix within the beam coverage range, and calculate the ground reflection coefficient matrix, range resolution matrix and azimuth resolution matrix corresponding to the grid points at different range resolutions;

[0028] The threshold comparison unit receives the distance resolution matrix, the azimuth resolution matrix and the ground reflection coefficient matrix and compares them with the threshold range of the distance resolution, the threshold range of the azimuth resolution and the threshold range of the ground reflection coefficient stored in the threshold comparison unit respectively, obtains multiple grid points that simultaneously meet the distance resolution, the azimuth resolution and the ground reflection coefficient and sends them to the graphical display unit to display a two-dimensional analysis diagram.

[0029] During implementation, the flight parameters of the carrier and the antenna installation angle and scanning range of the radar are used to determine the ground beam coverage range, draw a grid within the beam coverage range, and obtain the grid point coordinate matrix within the beam coverage range; calculate the slant angle matrix and slant range matrix corresponding to the grid points within the beam coverage range based on the flight parameters of the carrier and the grid point coordinate matrix; calculate the actual transmission gain matrix from the antenna to the grid point and the actual reception gain matrix from the antenna to the grid point based on the off-axis angle. It should be noted that the off-axis angle refers to the angle between the carrier target pointing and the antenna pointing; based on the actual transmission gain matrix from the antenna to the grid point, the actual reception gain matrix from the antenna to the grid point, the slant angle matrix, the slant range matrix, the system loss of the radar (it should be noted that the system loss of the radar is a fixed value, and each model of radar has a fixed value) The radar equation is calculated based on the system loss (usually including waveform loss or transmission loss, etc.) and the average power to obtain the ground reflection coefficient matrix of the grid points at different distance resolutions; the distance resolution matrix of the grid points is obtained based on the radar bandwidth, the height of the carrier and the slant range matrix; the azimuth resolution matrix of the grid points is obtained based on the carrier's velocity (which can be obtained by calculating the three-dimensional velocity of the carrier), wavelength, synthetic aperture time, slant angle matrix and slant range matrix; the range resolution in the distance resolution matrix of the grid points, the azimuth resolution in the azimuth resolution matrix and the ground reflection coefficient in the ground reflection coefficient matrix are screened according to the threshold range to obtain multiple grid points that simultaneously meet the range resolution, azimuth resolution and ground reflection coefficient requirements, and are displayed graphically to obtain a two-dimensional analysis diagram.

[0030] It should be noted that the carrier refers to the base used to carry the radar, such as aircraft, satellites, spacecraft, etc. The flight parameters of the carrier include the carrier's coordinates in the navigation coordinate system, pitch attitude, yaw attitude, roll attitude, and three-dimensional velocity.

[0031] According to the two-dimensional analysis diagram obtained by the above system, the beam coverage range can be divided into multiple areas, and the resolution distribution characteristics within the ground beam coverage range at different oblique angles can be obtained, for example, resolving 1 meter × 1 meter × sigma (ground reflection coefficient) = -12, 3 meters × 3 meters × sigma (ground reflection coefficient) = -12 and 5 meters × 5 meters × sigma (ground reflection coefficient) = -12. In practical applications, for example, the grid points of the circular marks are grid points that meet the distance resolution and azimuth resolution of 1 meter × 1 meter × sigma (ground reflection coefficient) = -12, the grid points of the cross-shaped marks are grid points that meet the distance resolution and azimuth resolution of 3 meters × 3 meters × sigma (ground reflection coefficient) = -12, and the grid points of the triangular marks are grid points that meet the distance resolution and azimuth resolution of 5 meters × 5 meters × sigma (ground reflection coefficient) = -12. When the carrier needs to perform image detection with a distance resolution and azimuth resolution of 1 meter × 1 meter × sigma (ground reflection coefficient) = -12, the various parameters of the carrier and the radar can be controlled to be consistent with the various parameters corresponding to the grid points of the circular marks, so that image detection with a distance resolution and azimuth resolution of 1 meter × 1 meter × sigma (ground reflection coefficient) = -12 can be achieved, thereby guiding radar image detection.

[0032] Compared with the existing technology, the system for obtaining a multi-dimensional visualization analysis diagram of SAR detection capability provided in this embodiment, based on the needs of radar detection capability analysis, comprehensively calculates and filters indicators such as range resolution, azimuth resolution, and ground reflection coefficient that were previously calculated separately. It presents the radar capability boundary in multiple dimensions through two-dimensional images, maps the vehicle's position, three-dimensional velocity, and three-dimensional posture to multiple dimensions such as the radar's effective range, oblique angle, and off-axis angle, and provides the distribution characteristics of the resolution within the ground beam coverage range. This can more intuitively demonstrate the radar detection capability, facilitating operators' intuitive understanding of the radar's detection capability.

[0033] Specifically, in the above data calculation unit, the grid point coordinate matrix uses the following formula:

[0034] T x =[x1,x2,…,x M ]

[0035] T z =[z1,z2,…,z N ]

[0036] Among them, x1, x M 、z1、z N are the coordinates of the intersection of the maximum coverage range of the beam and the two-dimensional coordinate axis of the ground, T x 、T zis the two-dimensional coordinate matrix of the grid points, x is an integer from 1 to M, and z is an integer from 1 to N.

[0037] In the above data calculation unit, the slant angle matrix θ and the slant distance matrix R are calculated using the following formula:

[0038] θ v =arctan(v z / v x )

[0039] θ p =arctan(T z -P z ) / (T x -P z )

[0040] θ=θ p -θ v

[0041]

[0042] Among them, θ is the slant angle matrix, R is the slant distance matrix, and v x is the north velocity of the carrier in the navigation coordinate system, v z is the east speed of the carrier in the navigation coordinate system, (P x ,P y ,P z ) is the coordinate of the carrier in the navigation coordinate system, T x 、T z is the two-dimensional coordinate matrix of the grid points, x is an integer from 1 to M, and z is an integer from 1 to N.

[0043] In the above data calculation unit, the actual transmission gain matrix G from the antenna to the grid point is tT And the actual receiving gain matrix G from the antenna to the grid point rT The calculation is based on the following formula:

[0044]

[0045]

[0046] Among them, G t is the antenna transmission gain, G r G is the antenna receiving gain. Each model of GAR has a fixed G t and G r , both are known values, G tT is the actual transmission gain matrix from the antenna to the grid point, G rT is the actual receiving gain matrix from the antenna to the grid point, is the off-axis angle matrix.

[0047] In the above data calculation unit, the ground reflection coefficient matrix is ​​calculated using the following formula:

[0048]

[0049] Where σ is the ground reflection coefficient matrix, R is the slant range matrix, K = 1.38 × 10 -23 is the Boltzmann constant, T0 is the noise temperature, F n is the noise coefficient, L is the system loss, v is the sum velocity of the carrier in the northeast plane in the navigation coordinate system, θ (is the oblique viewing angle matrix, P av is the average power, G tT is the actual transmission gain matrix from the antenna to the grid point, G rT is the actual receiving gain matrix from the antenna to the grid point, SNR is the image signal-to-noise ratio, λ is the wavelength, D r is the range resolution (in this formula, is the specified value), and k=1.4 is the azimuth broadening factor.

[0050] In the above data calculation unit, the distance resolution matrix D r The calculation is based on the following formula:

[0051]

[0052]

[0053] Among them, D r is the distance resolution matrix, R is the slant range matrix, B r is the bandwidth of the radar, (P x ,P y ,P z ) is the coordinate of the carrier in the navigation coordinate system, k is the azimuth broadening factor, c is the speed of light, and β is the ground-grabbing angle.

[0054] In the above data calculation unit, the azimuth resolution matrix D a The calculation is based on the following formula:

[0055]

[0056] Among them, D a is the azimuth resolution matrix, k is the azimuth broadening factor, λ is the wavelength, R is the slant range matrix, v is the sum velocity of the carrier in the northeast plane in the navigation coordinate system, θ (is the slant angle matrix, T a is the synthetic aperture time.

[0057] It is worth noting that, in practical applications, the velocity error and height error of the carrier will also affect the detection capability of the radar. Therefore, the acquisition system of the above-mentioned radar detection capability two-dimensional analysis diagram also includes a distortion rate acquisition unit;

[0058] The threshold comparison unit receives the distortion rate and compares the distortion rates corresponding to multiple grid points that simultaneously meet the range resolution, azimuth resolution, and ground reflection coefficient requirements with a threshold stored in the threshold comparison unit. The resulting multiple grid points that simultaneously meet the range resolution, azimuth resolution, ground reflection coefficient, and distortion rate requirements are sent to the graphical display unit for display as a two-dimensional analysis graph. During implementation, the theoretical two-dimensional positions of the four edge points of the ground beam coverage range are obtained based on the ground beam coverage range. The carrier's three-dimensional velocity error and altitude error are added to the ground beam coverage range to obtain the actual ground beam coverage range and the actual two-dimensional positions of the four edge points of the actual beam coverage range. The difference between the actual two-dimensional position and the theoretical two-dimensional position is calculated, and the maximum value of the ratio of this difference to the two-dimensional width of the actual beam coverage range is the distortion rate.

[0059] It can be understood that in order to realize the storage of the above-mentioned units, the acquisition system of the above-mentioned radar detection capability two-dimensional analysis chart also includes a memory 2 for storing data calculation units, threshold comparison units and graphical display units. Exemplarily, the memory 2 can be a chip.

[0060] In order to effectively protect the memory 2, the above-mentioned system for obtaining the two-dimensional analysis diagram of radar detection capability also includes a shell 1, and the memory 2 is arranged in the shell 1. The shell 1 can effectively protect the memory 2 and extend its service life.

[0061] In practical applications, considering that the memory 2 is an electronic device, when the carrier is an aircraft, the memory 2 will inevitably be subjected to a certain impact when the carrier lands. The above-mentioned radar detection capability two-dimensional analysis diagram acquisition system also includes a buffer, and the memory 2 is detachably connected to the housing 1 through the buffer. Figure 1 .

[0062] By way of example, the buffer member comprises a first curved rod 3, a connecting tube 5, and a second curved rod 4. One end of the first curved rod 3 is slidably connected to one end of the second curved rod 4 via the connecting tube 5. The other ends of the first curved rod 3 and the second curved rod 4 are connected to the housing 1, and the reservoir 2 is disposed on the connecting tube 5. Thus, on the one hand, because both the first curved rod 3 and the second curved rod 4 are curved, when the reservoir 2 is impacted, the first curved rod 3 and the second curved rod 4 can undergo a certain degree of elastic deformation, thereby providing a buffering effect. On the other hand, one end of the first curved rod 3 is slidably connected to one end of the second curved rod 4 via the connecting tube 5. During the elastic deformation of the first curved rod 3 and the second curved rod 4, the ends of the two rods approach each other, increasing their elastic deformation and thus further buffering the impact.

[0063] Considering that any material has a deformation limit, in order to avoid the first curved rod 3 and the second curved rod 4 from being damaged due to excessive deformation, it is necessary to appropriately limit the relative sliding displacement between the first curved rod 3 and the second curved rod 4. One end of the connecting tube 5 is sleeved on the outer wall of the first curved rod 3, and the other end of the connecting tube 5 is sleeved on the outer wall of the second curved tube. Limiting members are provided between the connecting tube 5 and the first curved rod 3 and between the connecting tube 5 and the second curved rod 4. Figure 2 .

[0064] Exemplarily, the limiting member includes an outer ring 6 provided on the outer walls of the first arc rod 3 and the second arc rod 4 and an inner ring provided on the inner wall of the connecting tube 5. The outer ring 6 is a rigid ring and the inner ring is an elastic ring. The inner diameter of the inner ring is smaller than the outer diameter of the outer ring 6. As the inner diameters of the multiple inner rings gradually decrease as they approach the midpoint of the connecting tube 5.

[0065] Taking the inner ring and outer ring 6 between the connecting tube 5 and the first arc rod 3 as an example, the number of outer ring 6 is 1, and the number of inner rings is 2, namely the first inner ring 7 and the second inner ring 8. A baffle 9 is provided on the side of the second inner ring 8 away from the first inner ring 7. When not impacted, the outer ring 6 is located on the side of the first inner ring 7 away from the second inner ring 8 and does not contact the first inner ring 7; when the elastic deformation of the first arc rod 3 is too large, the outer ring 6 squeezes the first inner ring 7 and enters between the first inner ring 7 and the second inner ring 8, and collides with the second inner ring 8, absorbing part of the impact force, and the second inner ring 8 can limit the sliding displacement between the first arc member and the connecting tube 5 to a certain extent, preventing the outer ring 6 from further sliding displacement; when the first arc rod 3 is close to the maximum elastic deformation, the outer ring 6 squeezes the second inner ring 8 and abuts against the baffle 9, thereby preventing the outer ring 6 from further sliding displacement, thereby avoiding damage to the outer ring 6.

[0066] Exemplarily, obtaining a plurality of grid points that simultaneously meet the requirements of the distance resolution, the azimuth resolution, and the ground reflection coefficient by comparing with the threshold range of the distance resolution, the threshold range of the azimuth resolution, and the threshold range of the ground reflection coefficient stored in the threshold comparison unit comprises the following steps:

[0067] Step a: Determine whether the range resolution in the range resolution matrix is ​​within the range resolution threshold range. If so, determine whether the grid point corresponding to the range resolution meets the conditions, and obtain multiple grid points that meet the range resolution.

[0068] Step b: determining whether the azimuth resolution of the plurality of grid points satisfying the range resolution is within the azimuth resolution threshold range; if so, determining whether the grid point corresponding to the azimuth resolution satisfies the condition, and obtaining a plurality of grid points satisfying both the range resolution and the azimuth resolution;

[0069] Step c: Determine whether the ground reflection coefficients of multiple grid points that simultaneously meet the distance resolution and azimuth resolution are within the ground reflection coefficient threshold range. If so, determine whether the grid points corresponding to the ground reflection coefficients meet the conditions, and obtain multiple grid points that simultaneously meet the distance resolution, azimuth resolution, and ground reflection coefficient.

[0070] Alternatively, the steps of comparing the values ​​with the threshold range of the distance resolution, the threshold range of the azimuth resolution, and the threshold range of the ground reflection coefficient stored in the threshold comparison unit to obtain a plurality of grid points that simultaneously meet the requirements of the distance resolution, the azimuth resolution, and the ground reflection coefficient include the following:

[0071] Step a': determining whether the azimuth resolution in the azimuth resolution matrix is ​​within the azimuth resolution threshold range; if so, determining whether the grid point corresponding to the azimuth resolution satisfies the conditions, and obtaining a plurality of grid points that meet the azimuth resolution;

[0072] Step b': determining whether the range resolution of the plurality of grid points satisfying the azimuth resolution is within a range of the range resolution threshold; if so, determining whether the grid points corresponding to the range resolution satisfy the conditions, and obtaining a plurality of grid points satisfying both the azimuth resolution and the range resolution;

[0073] Step c': Determine whether the ground reflection coefficients of multiple grid points that simultaneously meet the azimuth resolution and the range resolution are within the ground reflection coefficient threshold range. If so, determine whether the grid points corresponding to the ground reflection coefficients meet the conditions, and obtain multiple grid points that simultaneously meet the range resolution, azimuth resolution, and ground reflection coefficient.

[0074] Alternatively, the steps of comparing the values ​​with the threshold range of the distance resolution, the threshold range of the azimuth resolution, and the threshold range of the ground reflection coefficient stored in the threshold comparison unit to obtain a plurality of grid points that simultaneously meet the requirements of the distance resolution, the azimuth resolution, and the ground reflection coefficient include the following:

[0075] Step a'': determining whether a ground reflection coefficient in a ground reflection coefficient matrix is ​​within a ground reflection coefficient threshold range; if so, determining whether a grid point corresponding to the ground reflection coefficient satisfies a condition, and obtaining a plurality of grid points satisfying the ground reflection coefficient;

[0076] Step b'': determining whether the azimuth resolution of the plurality of grid points satisfying the ground reflection coefficient is within the azimuth resolution threshold range; if so, determining whether the grid point corresponding to the azimuth resolution satisfies the condition, and obtaining a plurality of grid points satisfying both the ground reflection coefficient and the azimuth resolution;

[0077] Step c”: Determine whether the range resolution of the multiple grid points that simultaneously meet the ground reflection coefficient and azimuth resolution is within the range resolution threshold. If so, determine whether the grid points corresponding to the range resolution meet the conditions, and obtain multiple grid points that simultaneously meet the range resolution, azimuth resolution, and ground reflection coefficient.

[0078] Alternatively, the steps of comparing the values ​​with the threshold range of the distance resolution, the threshold range of the azimuth resolution, and the threshold range of the ground reflection coefficient stored in the threshold comparison unit to obtain a plurality of grid points that simultaneously meet the requirements of the distance resolution, the azimuth resolution, and the ground reflection coefficient include the following:

[0079] Step A: Determine whether the ground reflection coefficient in the ground reflection coefficient matrix is ​​within the ground reflection coefficient threshold range. If so, determine whether the grid point corresponding to the ground reflection coefficient meets the conditions, and obtain multiple grid points that meet the ground reflection coefficient.

[0080] Step B: Determine whether the range resolution of the multiple grid points that meet the ground reflection coefficient is within the range of the range resolution threshold. If so, determine whether the grid points corresponding to the range resolution meet the conditions, and obtain multiple grid points that simultaneously meet the ground reflection coefficient and the range resolution.

[0081] Step C: Determine whether the azimuth resolution of multiple grid points that simultaneously meet the ground reflection coefficient and distance resolution is within the azimuth resolution threshold range. If so, determine whether the grid point corresponding to the azimuth resolution meets the conditions, and obtain multiple grid points that simultaneously meet the distance resolution, azimuth resolution, and ground reflection coefficient.

[0082] Alternatively, the steps of comparing the values ​​with the threshold range of the distance resolution, the threshold range of the azimuth resolution, and the threshold range of the ground reflection coefficient stored in the threshold comparison unit to obtain a plurality of grid points that simultaneously meet the requirements of the distance resolution, the azimuth resolution, and the ground reflection coefficient include the following:

[0083] Step A': determining whether the azimuth resolution in the azimuth resolution matrix is ​​within the azimuth resolution threshold range; if so, determining whether the grid point corresponding to the azimuth resolution satisfies the conditions, and obtaining a plurality of grid points that meet the azimuth resolution;

[0084] Step B': determining whether the range resolution of the multiple grid points that meet the azimuth resolution is within the ground reflection coefficient threshold range; if so, determining whether the grid point corresponding to the ground reflection coefficient meets the condition, and obtaining multiple grid points that simultaneously meet the azimuth resolution and the ground reflection coefficient;

[0085] Step C': Determine whether the range resolution of multiple grid points that simultaneously meet the requirements of azimuth resolution and ground reflection coefficient is within the range resolution threshold. If so, determine whether the grid points corresponding to the range resolution meet the requirements, and obtain multiple grid points that simultaneously meet the requirements of range resolution, azimuth resolution, and ground reflection coefficient.

[0086] Alternatively, the steps of comparing the values ​​with the threshold range of the distance resolution, the threshold range of the azimuth resolution, and the threshold range of the ground reflection coefficient stored in the threshold comparison unit to obtain a plurality of grid points that simultaneously meet the requirements of the distance resolution, the azimuth resolution, and the ground reflection coefficient include the following:

[0087] Step A”: determining whether the range resolution in the range resolution matrix is ​​within a range resolution threshold range; if so, determining whether the grid point corresponding to the range resolution satisfies a condition, and obtaining a plurality of grid points that satisfy the range resolution;

[0088] Step B': determining whether the azimuth resolution of the plurality of grid points that meet the range resolution is within a ground reflection coefficient threshold range; if so, determining whether the grid point corresponding to the ground reflection coefficient meets the condition, and obtaining a plurality of grid points that simultaneously meet the range resolution and the ground reflection coefficient;

[0089] Step C”: Determine whether the azimuth resolution of multiple grid points that simultaneously meet the range resolution and the ground reflection coefficient is within the azimuth resolution threshold range. If so, determine whether the grid point corresponding to the azimuth resolution meets the conditions, and obtain multiple grid points that simultaneously meet the range resolution, azimuth resolution, and ground reflection coefficient.

[0090] Alternatively, the steps of comparing the values ​​with the threshold range of the distance resolution, the threshold range of the azimuth resolution, and the threshold range of the ground reflection coefficient stored in the threshold comparison unit to obtain a plurality of grid points that simultaneously meet the requirements of the distance resolution, the azimuth resolution, and the ground reflection coefficient include the following:

[0091] At the same time, it is determined whether the distance resolution in the distance resolution matrix is ​​within the distance resolution threshold range, whether the azimuth resolution in the azimuth resolution matrix is ​​within the azimuth resolution threshold range, and whether the ground reflection coefficient in the ground reflection coefficient matrix is ​​within the ground reflection coefficient threshold range;

[0092] If the range resolution, azimuth resolution, and ground reflection coefficient are all within their respective threshold ranges, the grid points corresponding to the range resolution, azimuth resolution, and ground reflection coefficient are judged to meet the conditions, and multiple grid points that simultaneously meet the range resolution, azimuth resolution, and ground reflection coefficient are obtained.

[0093] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A system for obtaining a multi-dimensional visualization analysis diagram of SAR detection capability, characterized in that: It includes a data calculation unit, a threshold comparison unit and a graphical display unit; the data calculation unit is used to determine the ground beam coverage range, obtain the grid point coordinate matrix within the beam coverage range, and calculate the ground reflection coefficient matrix, range resolution matrix and azimuth resolution matrix corresponding to the grid points at different distance resolutions; The threshold comparison unit receives the distance resolution matrix, the azimuth resolution matrix, and the ground reflection coefficient matrix and compares them with the threshold range of the distance resolution, the threshold range of the azimuth resolution, and the threshold range of the ground reflection coefficient stored in the threshold comparison unit, respectively, obtains a plurality of grid points that simultaneously meet the distance resolution, the azimuth resolution, and the ground reflection coefficient, and sends them to the graphical display unit for displaying a two-dimensional analysis graph; The acquisition system further includes a memory for storing the data calculation unit, the threshold comparison unit, and the image display unit; the acquisition system further includes a housing, the memory being disposed within the housing; the memory being detachably connected to the housing; and the memory being connected to the housing via a buffer member; The buffer member includes a first curved rod, a connecting tube, and a second curved rod connected in sequence; the memory is provided on the connecting tube; one end of the first curved rod is slidably connected to one end of the second curved rod via the connecting tube, and the other end of the first curved rod and the other end of the second curved rod are connected to the housing; one end of the connecting tube is sleeved on the outer wall of the first curved rod, and the other end of the connecting tube is sleeved on the outer wall of the second curved tube; A stopper is provided between the connecting tube and the first curved rod, and between the connecting tube and the second curved rod; the stopper comprises an outer ring provided on the outer walls of the first curved rod and the second curved rod, and an inner ring provided on the inner wall of the connecting tube, the outer ring being a rigid ring and the inner ring being an elastic ring, the inner diameter of the inner ring being smaller than the outer diameter of the outer ring; The carrier is a base for carrying the radar, and the carrier is an aircraft.

2. The system for obtaining a multi-dimensional visualization analysis diagram of SAR detection capability according to claim 1, characterized in that: The inner diameters of the plurality of inner rings gradually decrease in a direction approaching the midpoint of the connecting pipe.

Images