A method for dynamically estimating noise from radar echoes and a weather radar system
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A radar echo and noise technology, which is applied in the radar field, can solve the problems of system noise that cannot be dynamically changed in real time, and the weather prediction accuracy is not high enough, so as to avoid calculation deviation and improve accuracy.
Active Publication Date: 2019-02-01
BEIJING METABTAR RADAR
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[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
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Embodiment 1
[0027] Please refer to figure 1 , an embodiment of the present invention provides a method for filtering residual ground clutter, including:
[0028] 101. Calculate the power spectrum: convert the radar echo signal into an IQ time-series signal, perform Fourier transform (Fast Fourier Transform, FFT) on the IQ time-series signal whose sampling number is N in the Mth distance library, and calculate the power spectrum coefficient , get the power spectrum sp M , M is a positive integer.
[0029] 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 subseque...
Embodiment 2
[0046] Please refer to figure 2, an embodiment of the present invention provides a weather radar system, including:
[0047] A signal conversion module 201, configured to convert the radar echo signal into an IQ timing signal;
[0048] The power spectrum module 202 is used to perform Fourier transform on the IQ time-series signal whose number of samples is N in the Mth distance library, and calculate the power spectrum coefficients to obtain the power spectrum sp M , M is a positive integer; power spectrum sp in ascending order M Sort, record the sorted power spectrum as sp S ;
[0049] 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<1, execute the following cycle calculation: make mc=mc-1, calculate b1 and b2 and the new b0, where:
[0050] b0=b2 / b1;
[0051] The noise calculation module 204 is used to judge whether there is b1≤0 after each cycle calculation, and record the current mc; i...
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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...
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