Two-way multi-order related detection method for dual-polarization weather radar

A weather radar and related detection technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of difficult wide application, low level of weak signal detection, high noise power, etc.

Active Publication Date: 2015-02-11
CHENGDU UNIV OF INFORMATION TECH
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Problems solved by technology

This detection method only uses the signal-to-noise ratio of the horizontal polarization echo for threshold comparison, which continues the detection method of the traditional single-polarization Doppler weather radar, so it cannot make up for the loss of the signal-to-noise ratio caused by it, resulting in the background noise power High and weak signal detection level is low, it is difficult to be widely used

Method used

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  • Two-way multi-order related detection method for dual-polarization weather radar
  • Two-way multi-order related detection method for dual-polarization weather radar
  • Two-way multi-order related detection method for dual-polarization weather radar

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Embodiment 1

[0098] It is implemented on an integrated signal processing platform based on DSP (Digital Signal Processor), which completes all signal processing from the radar intermediate frequency digitization.

[0099] Such as image 3 As shown, the dotted box is the realization platform of the method of the present invention. The dual intermediate frequency signals of the H channel and the V channel are respectively sent to the analog-to-digital converter ADC for digital sampling synchronously. The sampling process satisfies the sampling law (low-pass sampling law or band-pass sampling law), and digital quadrature identification is performed through a large-capacity high-performance FPGA Phase, output the digital in-phase / quadrature (I / Q) signal of H channel and V channel, and then send it to DSP for this algorithm processing. First, DSP caches the current I / Q data in DDR2 memory while processing the cached Complete I / Q data within a radial.

[0100] Before the weather echo detection...

Embodiment 2

[0102] It is implemented on an integrated signal processing platform based on PC (Personal Computer), which completes all signal processing from the radar intermediate frequency digitization.

[0103] Such as Figure 4 As shown, the PC is the main hardware carrier to complete the algorithm. The PCI-based data interface card is responsible for collecting the dual-channel in-phase / orthogonal data output by the FGPA, and writes data to the computer memory by interrupting the DMA regularly through the PCI bus. The main program responds to the interrupt, and processes the zero-order autocorrelation, first-order autocorrelation and zero-order cross-correlation of the H and V channels in a multi-threaded manner, and calculates the weight of the correlation according to the set weighting coefficients a, b, and c and, after obtaining the weighted sum result, compare it with the preset threshold to detect whether the weather target exists, and when the target is found, calculate the met...

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Abstract

The invention discloses a two-way multi-order related detection method for a dual-polarization weather radar. The method comprises the following steps: obtaining I / Q (in-phase / quadrature) data of an H (horizontal) channel and a V (vertical) channel; calculating the coherent integration quantities of the H channel and the V channel; calculating the zero-order self-correlation, first-order self-correlation and zero-order cross-correlation quantities of the H channels and the V channels; calculating the weight sum of the multi-order correlation quantity; comparing the weight sum with a threshold value, judging if a weather echo is generated, and if so, calculating the signal-to-noise ratio of the H channel; calculating reflectivity factors under different signal-to-noise ratios; and controlling the quality according to the reflectivity factors, and outputting results. According to the method, the weight sum of the multi-order correlation quantity is introduced in combination with horizontal and vertical polarization echo signals to change a conventional method which simply takes the signal-to-noise ratio of the H channel as a detection factor so as to achieve the purposes of reducing the background noise power and increasing the weak signal detection level, and reduce the loss of the signal-to-noise ratio of an echo wave in a double-transceiver mode.

Description

technical field [0001] The invention relates to a dual-path detection method for a dual-polarization weather radar, in particular to a dual-path and multi-order correlation detection method for a dual-polarization weather radar by introducing a weighted sum of multi-order correlation quantities. Background technique [0002] At present, weather radar (also known as Doppler weather radar) is the main precipitation observation equipment used by meteorological units at home and abroad, and plays an important and irreplaceable role in the early warning of hazardous short-term approaching weather and the process of meteorological disaster prevention and mitigation. Signal processing undertakes key tasks such as discovering meteorological echo signals, extracting meteorological parameters, and data quality control in the weather radar system. Its main processes are as follows: figure 1 Shown: Including coherent accumulation or non-coherent accumulation, signal-to-noise ratio calcu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
Inventor 史朝何建新史万里王丽娟张福贵李学华唐顺仙王旭
Owner CHENGDU UNIV OF INFORMATION TECH
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