Method for dynamically estimating noise through radar echo and meteorological radar system

A technology of radar echo and noise, which is applied in the field of radar, can solve the problems of insufficient accuracy of meteorological prediction and the inability to collect dynamic system noise in real time, and achieve the effect of avoiding calculation deviation and improving accuracy

Active Publication Date: 2016-04-27
BEIJING METABTAR RADAR
View PDF6 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, an embodiment of the present invention provides a method for dynamically estimating noise from radar echoes and a weather radar system to solve the problem that the existing weather radar system cannot collect dynamically changing system noise in real time, so the accuracy of weather prediction is not high enough technical problem

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for dynamically estimating noise through radar echo and meteorological radar system
  • Method for dynamically estimating noise through radar echo and meteorological radar system
  • Method for dynamically estimating noise through radar echo and meteorological radar system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Please refer to figure 1 , an embodiment of the present invention provides a method for filtering residual ground clutter, including:

[0026] 101. Calculate the power spectrum: convert the radar echo signal into an IQ time-series signal, perform Fourier transform (FastFourierTransform, FFT) on the IQ time-series signal whose sampling number is N in the k-th distance library, and calculate the power spectrum coefficient to obtain The power spectrum sp,k is a positive integer.

[0027] When performing meteorological forecasts, the weather radar system scans in plane position scanning and / or volume scanning mode to obtain radar echo signals. Subsequently, based on the analysis and calculation of the radar echo signal, the weather is predicted. In the actual signal processing, the radar echo signal is also converted into an IO timing signal. The IQ timing signal refers to the signal obtained by shifting the phase of the radar echo signal by 90 degrees, and the subsequent...

Embodiment 2

[0043] Please refer to figure 2 , an embodiment of the present invention provides a weather radar system, including:

[0044] A signal conversion module 201, configured to convert the radar echo signal into an IQ timing signal;

[0045] The power spectrum module 202 is used to carry out Fourier transform to the IQ time-series signal whose number of samples of the kth distance library is N, and calculates the power spectrum coefficients to obtain the power spectrum sp, and k is a positive integer; power spectrum sp in ascending order Sort, record the sorted power spectrum as sp S ;

[0046]The cycle calculation module 203 is used to set the variables mc and b0, when initializing mc=N, b0=0; when judging mc>2, and b0 b 1 = 1 mc Σ n = 1 mc sp s ( n ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for dynamically estimating noise through radar echo and a meteorological radar system and solves a technical problem of non-high meteorological prediction accuracy existing in a meteorological radar system in the prior art which can not acquire dynamically-changed system noise in real time. The method comprises steps that a radar echo signal is converted into an IQ sequence signal, Fourier transform of the IQ sequence signal with the sampling number of N in a kth distance database is carried out, a power spectrum coefficient is calculated to acquire power spectrums sp, the k is a positive integer; the power spectrums sp are ordered in an ascending order, and the ordered power spectrums sp are marked as S; variables mc and b0 are set, during initiation, the mc is made to be equal to the N, and the b0 is made to be 0; when it is determined that the mc is greater than 2, and the b0 is smaller than 1, cycle calculation is carried out according to formulas described in the specification; after each cycle calculation, whether the b1 is not greater than 0 is determined, and the present mc is recorded; if the b1 is not greater than 0, the system noise is estimated by employing the present mc, and thereby the system noise of the kth distance database is acquired according to a formula described in the specification.

Description

technical field [0001] The invention relates to the technical field of radar, in particular to a method for dynamically estimating noise from radar echoes and a weather radar system. Background technique [0002] In the weather radar signal processing, the system noise of the weather radar system needs to be removed from the radar echo signal to ensure the accuracy of the weather forecast. [0003] Weather radar systems generally have two scanning modes, namely plane position scanning and volume scanning. Plane position scanning refers to: the radar fixes the elevation angle and performs a 360-degree scan. Volume scan refers to: a group of plane position scans at different elevation angles from low to high. [0004] At present, the following methods are usually used to collect the system noise of the weather radar system. The collection method includes: in the middle of the adjacent volume scan of the system, at a position with a relatively high antenna elevation angle (su...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/95G01S7/32
CPCY02A90/10
Inventor 孙召平张持岸虞海峰
Owner BEIJING METABTAR RADAR
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap