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Real-time calibration method and system for differential reflectivity factors

A differential reflection and calibration technology, applied to radio wave measurement systems, instruments, etc., can solve problems such as the inability to achieve accurate calibration of differential reflectivity factors, and achieve the effect of improving measurement accuracy

Inactive Publication Date: 2018-12-07
BEIJING INST OF RADIO MEASUREMENT
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Problems solved by technology

However, the radar system error will gradually change with time, and the existing calibration methods cannot achieve accurate calibration of the differential reflectivity factor

Method used

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Embodiment Construction

[0026] The principles and features of the present invention will be described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0027] Such as figure 1 As shown, it is a schematic flow chart provided by an embodiment of a real-time calibration method of a differential reflectivity factor in the present invention. The real-time calibration method is used for a dual-polarization system radar. The dual-polarization system radar includes: machines, signal processors and computers. The real-time calibration method includes:

[0028] S1, the receiver generates a waveform signal according to the calibration signal and the excitation signal.

[0029] It should be noted that, if figure 2 As shown, a schematic diagram of a possible waveform signal is given. The receiver will generate this waveform signal every detection repetition period (PRT...

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Abstract

The invention discloses a real-time calibration method and system for differential reflectivity factors, and relates to the field of dual polarization system meteorological radars. The method comprises the following steps: waveform signals are generated via a receiver according to calibration signals and excitation signals; the calibration signals are divided into horizontal calibration signals and vertical calibration signals via a feeder line component, and the excitation signals are transmitted to a transmitter; detection signals are transmitted via the transmitter according to the excitation signals, the two paths of calibration signals are processed via the receiver to obtain two paths of intermediate frequency calibration signals, and echo signals which are generated after a target is detected via the detection signals are received; a signal processor is used for processing the two paths of intermediate frequency calibration signals to obtain digital calibration signals, and thedifferential reflectivity factors are obtained according to the echo signals; real-time calibration is performed on the differential reflectivity factors via a computer according to the digital calibration signals. Via the real-time calibration method and system disclosed in the invention, online real-time calibration of the differential reflectivity factors can be realized, and polarization parameter measurement by the dual polarization system meteorological radars can be improved in terms of accuracy.

Description

technical field [0001] The invention relates to the field of dual-polarization system meteorological radars, in particular to a real-time calibration method and system for differential reflectivity factors. Background technique [0002] With the development of dual-polarization technology, dual-polarization system radar has become a main development direction of weather radar. In addition to obtaining the intensity and velocity information of meteorological targets, the dual-polarization system meteorological radar can also obtain polarization parameter information such as differential reflectivity factors of meteorological targets. difference in direction. [0003] However, radar system errors can interfere with the accurate measurement of the differential reflectivity factor. At present, the radar system error is obtained through external calibration or offline calibration, and then the differential reflectivity factor is corrected according to the radar system error. H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40
CPCG01S7/4004
Inventor 孔龙时魏艳强李岩松徐磊王刚李英贺冯凯
Owner BEIJING INST OF RADIO MEASUREMENT
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