Calibration method

A technology of calibration and calibrator, applied in the field of calibration, can solve the problems of increasing the cost of calibration work, increasing measurement deviation, etc., and achieve the effect of reducing processing complexity, reducing cost and error, and improving flexibility

Active Publication Date: 2014-03-26
NAT SPACE SCI CENT CAS
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Problems solved by technology

Accurate measurement of the above variables will increase the cost of calibration work, and at the same time, as the number of i

Method used

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specific Embodiment approach

[0047] First, using an active scaler, the scattering cross-sectional area σ ref_0 Accurately known reference calibrator emits pulses

[0048] Rush and receive the scattered echo of the calibrator, and calculate the scattered power of the reference calibrator received by the calibrator

[0049] P atac_ref ; Use high-precision distance measuring equipment to accurately measure the straight-line distance R between the phase center of the calibration device antenna and the reference calibration body atac_ref .

[0050] Second, use the active calibration device for satellite-ground calibration, and calculate the received power sequence P of the altimeter from the data received by the altimeter alti_cal ; Calculate the received power sequence P of the scaler from the received data of the scaler atac_cal .

[0051] 3. Obtain the coordinate sequence of the phase center of the altimeter antenna through the satellite orbit data, obtain the coordinates of the phase center of the ant...

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Abstract

The invention provides a calibration method. According to the calibration method, an active calibrator is utilized for calibrating the deviation generated when an on-track radar height gauge measures the scattering cross section of a point target. The calibration method includes the steps of defining a calibration factor beta, wherein Pt_alti multiplied by Falti (0, 0)<2> and Galti_sys_point is beta, Pt_alti is transmitting power of the height gauge, Falti (0, 0) represents a power gain corresponding to an antenna of the height gauge in the largest radiation direction, and Galti_sys_point represents power gains provided by other parts, except for the antenna, of the height gauge; obtaining the scattering cross section of the point target according to the calibration factor beta, the receiving power of the height gauge and a radar equation, and completing calibration. The calibration method has the advantages that the active calibrator used in the method is of a single antenna structure, the cost and errors of directional diagram measurement through double antennas are reduced, information of an antenna directional diagram of the height gauge and information of an antenna directional diagram of the calibrator are included in receiving data of the height gauge and receiving data of the calibrator respectively, and calibration can be completed according to the calibration method without providing the information of the antenna directional diagram of the height gauge and the information of the antenna directional diagram of the calibrator independently.

Description

technical field [0001] The invention relates to the technical field of microwave remote sensing, in particular to a calibration method. Background technique [0002] The target's scattering cross-sectional area of ​​electromagnetic waves reflects the characteristics of the target. The sea surface scattering cross-sectional area measured by the spaceborne radar altimeter can be used to invert the strength of the sea surface wind field. During the operation of the altimeter in orbit, due to the influence of non-ideal factors such as equipment aging, the measurement of the target scattering cross-sectional area by the altimeter system will be deviated. In order to ensure the accuracy of altimeter data inversion of sea surface wind field strength, it is necessary to calibrate the scattering cross-sectional area measurement to eliminate the influence of the altimeter system on the scattering cross-sectional area measurement as much as possible. Since the measurement deviation o...

Claims

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/4026G01S13/882G01S7/403G01S7/4034
Inventor 万珺之郭伟王彩云赵飞刘鹏谌华何佳宁蔡朋飞
Owner NAT SPACE SCI CENT CAS
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