Space-borne synthetic aperture radar ground range resolution representation and parameter design method

A technology of synthetic aperture radar and parameter design, which is applied in the direction of radio wave reflection/re-radiation, re-radiation, and measurement devices, which can solve the uneven distribution of ground resolution and the inability to fully represent the ground-range resolution of spaceborne SAR issues such as capacity

Active Publication Date: 2015-05-06
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the above-mentioned ground distance resolution characterization method is only applicable to the positive side mode of the circular orbit
When the spaceborne SAR operates in an elliptical orbit or works in the squint mode, the two-dimensional side lobes of the ground distance are not vertical, the distribution of ground resolution is uneven, and the resolution of the ground distance in azimuth and the resolution in the range direction cannot fully represent Earth-Range Resolution Capability of Spaceborne SAR
In addition, existing resolution parameters (including synthetic aperture time and transmitted signal bandwidth) are based on quadrature sidelobes, which are not applicable in elliptical orbit or squint mode

Method used

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  • Space-borne synthetic aperture radar ground range resolution representation and parameter design method
  • Space-borne synthetic aperture radar ground range resolution representation and parameter design method
  • Space-borne synthetic aperture radar ground range resolution representation and parameter design method

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Effect test

Embodiment 1

[0092] Embodiment one: the satellite moves on the elliptical orbit, and each parameter of the orbit is specifically as follows:

[0093] Earth radius: 6371.004km

[0094] Orbit semi-major axis: 42164km

[0095] Orbit inclination: 50°

[0096] Orbit eccentricity: 0.1

[0097] Argument of perigee: 90°

[0098] The beam pointing parameters are as follows

[0099] Downward viewing angle: 4.5°

[0100] Azimuth: 15 degrees, 30 degrees, 45 degrees, 60 degrees, 75 degrees, 90 degrees Resolution related parameters are as follows

[0101] Transmission signal bandwidth: 15MHz

[0102] Synthetic Aperture Time: 75s

[0103] Echoes from point targets are simulated and imaged using backprojection algorithms. The long-axis and short-axis ground distance resolutions of the imaging results were evaluated, and compared with the calculation results, as shown in Table 1. The calculation results are consistent with the evaluation results, and the error is small.

[0104] Table 1 Compariso...

Embodiment 2

[0106] Embodiment 2, the satellite operates on an elliptical orbit, and each parameter of the orbit is specifically as follows:

[0107] Earth radius: 6371.004km

[0108] Orbit semi-major axis: 10000km

[0109] Orbit inclination: 50°

[0110] Orbit eccentricity: 0.1

[0111] Argument of perigee: 90°

[0112] The beam pointing parameters are as follows

[0113] Downward viewing angle: 20°

[0114] Azimuth: 45°

[0115] The antenna radiation parameters are as follows:

[0116] Antenna size: 10mx10m

[0117] Signal wavelength: 0.1m

[0118] Receiver noise figure: 3dB

[0119] System loss: 5dB

[0120] Antenna Efficiency: 60%

[0121] Equivalent backscatter coefficient: -20dB

[0122] 1. Ground distance resolution

[0123] If the transmitted signal bandwidth is 30MHz and the synthetic aperture time is 30s, the major axis and minor axis of the achievable ellipse resolution area are as follows: image 3 shown. Long axis and Y g The included angle of direction is as ...

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Abstract

The invention provides a space-borne synthetic aperture radar ground range resolution representation and parameter design method. According to the method, synthetic aperture time and an emission signal bandwidth can be designed by representation of a long axis ground range resolution rho l and a short axis ground range resolution rho s of an acquired space-borne synthetic aperture radar according to resolution l needed by the radar, and radar related parameters are adjusted, so that the adjusted radar resolution is smaller than or equal to the l. The method overcomes the shortcoming that the ground range resolution is represented by azimuth and range direction ground range resolution, the ground range resolution capacity of the SAR (synthetic aperture radar) can be more comprehensively reflected, and the resolution in all directions of a ground range plane meets system index requirements.

Description

technical field [0001] The invention belongs to the technical field of synthetic aperture radar, in particular to a spaceborne synthetic aperture radar ground range resolution characterization and parameter design method. Background technique [0002] Synthetic Aperture Radar (SAR) is an all-weather, all-weather high-resolution microwave remote sensing imaging radar that can be installed on aircraft, satellites, spacecraft and other flying platforms. It has unique advantages in environmental monitoring, ocean observation, resource exploration, crop yield estimation, surveying and mapping, and military applications, and can play a role that other remote sensing methods are difficult to play. [0003] Space-borne synthetic aperture radar refers to the synthetic aperture radar with satellite as the carrier. Spaceborne SAR can operate in circular or elliptical orbits. In a circular orbit, the velocity direction of the satellite's Earth-centered Earth-fixed (ECEF) coordinate sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S7/02G01S13/904G01S13/90
Inventor 丁泽刚曾涛尹伟龙腾朱宇任晶晶
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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