A meteorological radar rainfall detection and analysis system and method

Abstract

The invention discloses a weather radar rainfall detection and analysis system and method, belonging to the detection field of airborne weather radars. The front end of the receiver is provided with a noise source; the noise source can output signals stably, the main control unit of the signal processor controls the opening and closing of the noise source, and the digital signal processing unit of the signal processor records the noise source opening and closing respectively The AD sampling data at the time is calculated and processed to obtain the gain value of the receiving channel. Based on the method of the meteorological radar rainfall detection and analysis system, step 1, turn off the noise source, and calculate the gain calibration power P according to the IQ data of the sampling module 1 ; Step 2, turn on the noise source, and calculate the gain calibration power P according to the IQ data 2 ; Step three, calculate the noise figure F; Step four, calculate the gain G of the receiving channel; Step five, process the calculated receiving channel gain G; can accurately measure the channel gain, and eliminate the impact of the channel gain error on the accuracy and stability of meteorological detection sexual influence.

Description

technical field [0001] The invention belongs to the technical field of airborne weather radar detection, and in particular relates to a weather radar rainfall detection and analysis system and method. Background technique [0002] At present, the design of airborne weather radar does not introduce real-time measurement and calibration of channel gain. The channel gain value used in signal processing is only a single test result measured in the laboratory or during the flight test. Therefore, for rainfall The detection results have the following effects: [0003] 1) Due to the inherent characteristics of the analog device, the parameters have certain volatility, resulting in a certain difference between the parameter values ​​​​used in the software and the actual control values. [0004] 2) The parameter has a linear relationship with the intensity, and the fluctuation value directly affects the detection result. [0005] 3) According to engineering experience, there is a ±...

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Problems solved by technology

[0003] 1) Due to the inherent characteristics of the analog device, the parameters have certain volatility, resulting in a certain difference between the parameter values ​​​​used in the software and the actual control values

[0004] 2) There is a linear relationship between the parameter and the intensity, and the fluctuation value directly affects the detection result

[0005] 3) According to engineering experience, there is a ±3dB fluctuation in the system amplification gain, resulting in a change in the reflectivity factor of approximately ±3dBZ, and the division of the rainfall level mark, there is an error in the display of the target intensity, which may cause misjudgment by the crew and affect flight safety

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