A two-dimensional resolution evaluation method for squinting spaceborne SAR ground plane
A ground plane and resolution technology, applied in the direction of using re-radiation, instruments, measuring devices, etc., can solve the problem of large amount of calculation, and achieve the effect of large amount of calculation, high time complexity, and large time consumption
Active Publication Date: 2022-02-22
AEROSPACE INFORMATION RES INST CAS
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Problems solved by technology
Traditional echo data-based evaluation methods and ambiguity function-based evaluation methods require a large amount of calculations, and it is impossible to obtain two-dimensionally changing range and azimuth resolution projection factors in a short time
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Embodiment 1
[0058] Here, a typical space-borne SAR squint imaging mode is used to verify the effectiveness of the technical solution of the present invention.
[0059] Such as figure 2 As shown, the satellite moves along the orbit ACB, where point C is the center point of the trajectory, x-y-z forms the ground distance plane coordinate system of the scene, and x’-y’-z’ forms the inclined plane coordinate system.
[0060] image 3 Computes the geometry for the distance resolution projection factor; e.g. image 3 As shown, in the slant distance plane, the azimuth resolution unit vector and the range resolution unit vector are perpendicular to each other, and the direction of the projected vector is the normal direction of the slant plane, and the above two resolution unit vectors are projected to the ground distance plane coordinate system, At this time, the resolution unit size in the two directions will change.
[0061] Figure 4 is a group of example squint spaceborne SAR azimuth re...
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The invention discloses a two-dimensional resolution evaluation method for squinting spaceborne SAR ground plane. 1. Establish the normal vector of the slant distance plane according to the satellite orbit information at the start and end of the imaging and the coordinates of the ground aiming point; Step 3. At the ground aiming point, establish a local tangent plane according to the earth ellipsoid model, which is the conventional In SAR imaging, the ground plane converted from the slope distance to the ground distance; step 4, construct the slope distance vector according to the satellite position and the aiming point coordinates of the irradiation center time; step 5, obtain the projection of the slope distance vector on the ground plane according to the imaging geometry, Calculate the ratio of the projection vector and the slant distance vector to get the projection factor of the range resolution; step 6, obtain the azimuth resolution unit vector of the slant distance plane according to the slant distance plane normal vector and the slant distance vector, and calculate the azimuth resolution projection factor.
Description
technical field [0001] The invention relates to the field of radar measurement, in particular to a ground plane two-dimensional resolution evaluation under the squint imaging geometry of a spaceborne synthetic aperture radar (Synthetic ApertureRadar, SAR). Background technique [0002] With the continuous development of spaceborne SAR technology, the resolution and imaging width of spaceborne SAR images have been continuously improved, and they have played an important role in the fields of earth environment monitoring, military / civilian target monitoring, classification and identification, etc. In recent years, with the rapid development of spaceborne SAR antenna technology and the continuous improvement of spaceborne SAR applications, the imaging mode of spaceborne SAR has developed from the traditional fixed beam mode to two-dimensional beam scanning. From the traditional side-view imaging mode to the squint imaging mode, based on the development of spaceborne SAR azimuth...
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IPC IPC(8): G01S7/40G01S13/90
CPCG01S7/40G01S13/9041
Inventor 张衡王伟梁达邓云凯王宇
Owner AEROSPACE INFORMATION RES INST CAS