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Method for calibrating amplitude consistency of a plurality of ground receivers with radar satellite

A receiver and consistency technology, applied in the direction of re-radiation, radio wave reflection/re-radiation, and measuring devices, can solve problems such as incomplete alignment of equipment and affect test results, so as to ensure accuracy and Reliability, the effect of improving calibration accuracy

Active Publication Date: 2015-02-04
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0008] There are many sources of human error in this method, non-ideal far-field conditions, incomplete alignment of each device, changes in the output amplitude of the signal source over time, and the working conditions of each device will affect the final test results.

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  • Method for calibrating amplitude consistency of a plurality of ground receivers with radar satellite
  • Method for calibrating amplitude consistency of a plurality of ground receivers with radar satellite

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Embodiment Construction

[0032] The method of the present invention will be specifically described below in conjunction with the accompanying drawings. It should be pointed out that the described embodiments are only considered for the purpose of illustration and not limitation of the present invention.

[0033] A method of utilizing radar satellites to calibrate the amplitude consistency of multiple ground receivers of the present invention comprises the following steps:

[0034] Step (1): Select the site for multiple ground receivers: the site for ground receivers is unobstructed in front of the direction of incoming waves. When multiple ground receivers are deployed, the difference in altitude between them cannot exceed 5 radar resolutions. rate unit;

[0035] Step (2): Layout of the ground receiver. Such as figure 1 Shown: Calculate the coverage area of ​​the surveying zone and the centerline of the surveying zone according to the orbit forecast data of the orbit radar satellite, determine the ...

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Abstract

The invention discloses a method for calibrating amplitude consistency of a plurality of ground receivers with a radar satellite, and relates to the microwave remote sensing calibrating technology. A satellite-based SAR in orbit is used as an emission source, the ground receivers are distributed within a certain range of a calibrating field, compensation processing is carried out on data received by all the ground receivers to reduce detecting error amount of level signals with same power by the ground receivers, and receiving amplitudes of the ground receivers are consistent. The ground receivers receive signals transmitted by the satellite-based SAR, a series of ground receivers are distributed inwards in a swath range, thus fitting of an SAR transmitting range antenna pattern can be achieved, a single ground receiver is arranged in a swath azimuth, and therefore an SAR transmitting azimuth antenna pattern can be measured. According to the method, the mode that the satellite-based SAR is used for transmitting signals, and the ground receivers receive the signals simultaneously in the same place is adopted, the working environment and the working condition are high in consistency, and accuracy and reliability of calibrated results of the amplitude consistency are ensured.

Description

technical field [0001] The invention belongs to the technical field of microwave remote sensing calibration, in particular to a method for calibrating the amplitude consistency of multiple ground receivers by using radar satellites. Background technique [0002] Synthetic Aperture Radar (SAR) is an important tool for microwave remote sensing. It is not limited by weather, geography and time conditions, and can provide all-day and all-weather continuous observation. In microwave remote sensing fields such as military reconnaissance, resource detection, ocean observation, It has been widely cited in crop yield estimation, disaster prevention and control, and ecological monitoring. [0003] Due to the existence of many error sources in the entire signal flow of the SAR system, the overall transfer function is uncertain, resulting in poor repeatability of radar image measurement and radar images cannot accurately reflect the echo characteristics of actual ground objects. That i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/40G01S13/90
Inventor 朱勇涛李亮卢坤梁维斌洪峻
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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