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Intensity calibrating method of all-digital array phased-array weather radar

A technology of weather radar and phased array, which is applied in the direction of climate sustainability, radio wave reflection/reradiation, utilization of reradiation, etc., and can solve problems such as no longer applicable

Active Publication Date: 2015-02-18
ANHUI SUN CREATE ELECTRONICS
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Problems solved by technology

Since the scanning system and signal processing method of phased array radar are different from conventional radar, the traditional weather radar calibration method is no longer applicable to it, and it is urgent to develop a method for intensity calibration of phased array weather radar

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Embodiment Construction

[0026] Weather radar is one of the important detection methods of modern meteorology, and the accuracy of detection results is of great significance to weather forecast and atmospheric research. In order to improve the detection accuracy of radar, meteorological radar must be calibrated, and the process of controlling the error between the actual echo intensity and the theoretical value calculated by the radar meteorological equation through engineering technology means is the calibration of the radar system.

[0027] The traditional weather radar calibration process is to use the internal signal source (or external) to inject a signal P with a power of -90dBm to -30dBm r , at a distance r ranging from 5 to 200km, check the measured value of the echo intensity. The radar is calibrated by controlling the error between the reflectivity factor actually obtained by signal processing and the theoretical echo reflectivity calculated by the radar meteorological equation given by Prob...

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Abstract

The invention relates to an intensity calibrating method of all-digital array phased-array weather radar. The intensity calibrating method includes the steps that a radar monitoring terminal controls a correction extension set to send out simulation target signals, and a product terminal calculates an actual pulse pressure gain Gp; the radar monitoring terminal controls the correction extension set to send out a plurality of linear frequency modulation simulation target signals with fixed and sequentially and gradually attenuated echo power values, after the linear frequency modulation simulation target signals are processed by a signal processor, echo signal intensity values and spectrum processing signal intensity values are produced and sent to the product terminal through a network so as to be recorded into an intensity calibrating and testing record list, and an intensity curve yDVIP and a spectrum processing intensity curve yFFT are produced after fitting is conducted on the intensity calibrating and testing record list through the least square method; the product terminal inversely calculates echo power Pr when the radar normally works; the value of the obtained echo power Pr is substituted into an improved radar meteorological equation to obtain the value of a radar reflectivity factor dBZ. By means of the method, the special implementation steps and special testing processes of all-digital array weather radar intensity calibrating are established, and the method is fit for engineering practice and is simple, practical and high in calibrating accuracy.

Description

technical field [0001] The invention relates to the technical field of phased array weather radars, in particular to an intensity calibration method for full digital array phased array weather radars. Background technique [0002] Among the various ways that people detect the earth's atmosphere on which they live, weather radar plays a very important role. Compared with other detection methods, weather radar has high temporal and spatial resolution, and can detect disastrous weather in a timely and accurate manner. In particular, it is a very effective observation tool in small and medium-scale disastrous weather monitoring and short-term weather forecasting. [0003] The new generation of weather radar that has been deployed in my country has greatly improved the monitoring and early warning capabilities of disastrous weather. It can quantitatively detect rainfall echo intensity, radial velocity, and velocity spectrum width. With its high temporal and spatial resolution, ti...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40G01S13/95
CPCG01S7/4052Y02A90/10
Inventor 汪旭东卞真稳刘琦
Owner ANHUI SUN CREATE ELECTRONICS
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