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Dual-polarization weather radar echo signal simulation method

An echo signal and weather radar technology, which is applied in the field of dual-polarization weather radar echo signal simulation, can solve the problem that no echo signal is established, the dual-channel echo signal cannot be simulated, and the dual-polarization weather radar radar system performance evaluation cannot be applied. problems, to achieve the effect of improving test efficiency and reducing production and design costs

Active Publication Date: 2021-11-16
CHENGDU UNIV OF INFORMATION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method cannot simulate the dual-channel echo signal of dual-polarization weather radar, does not establish the relationship between the echo signal and the parameters of the dual-polarization weather radar system, does not consider the different characteristics of the working mode in the volume scan, and cannot simulate the weather radar volume scan process Echo characteristics of each scan mode in
[0006] Existing methods cannot be applied to radar system performance evaluation, new algorithm verification and analysis, scanning strategy analysis and other fields of dual polarization weather radar

Method used

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  • Dual-polarization weather radar echo signal simulation method
  • Dual-polarization weather radar echo signal simulation method
  • Dual-polarization weather radar echo signal simulation method

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Embodiment 1

[0101] This embodiment is a simulation method for dual-polarization weather radar echo signals. For the simulation process, see figure 1 . In order to realize the dual polarization echo signal simulation of a single target point, the specific steps are as follows:

[0102] (1) Read base data, read reflectance ,speed , spectral width , differential reflectivity , differential phase , correlation coefficient Six kinds of data, or set it yourself, prepare data for the formula in this embodiment;

[0103] (2) According to the simulation needs, set the predetermined radar system parameters etc., prepare data for the formula in this embodiment;

[0104] (3) Substitute the above parameters into the horizontal channel echo signal power calculation method and the vertical channel echo signal power calculation method to obtain the echo power with , and then with Substituting the power spectrum calculation method and the complex spectrum model calculation method of...

Embodiment 2

[0107] This embodiment is a method for simulating echo signals of a dual-polarization weather radar for all target points at one elevation angle. For the reflectivity factor PPI diagram in the actual weather process, please refer to Figure 4 , the speed PPI diagram in the actual weather process see Figure 5 , for the spectral width PPI diagram in the actual weather process see Image 6 , the differential reflectance PPI map in the actual weather process see Figure 7 , the differential phase PPI diagram in the actual weather process see Figure 8 . In order to realize the dual-polarization echo signal simulation of all target points at an elevation angle, firstly execute the steps of Example 1 cyclically for all targets within the elevation angle, and then complete the dual-polarization echo signal simulation of all target points at an elevation angle.

[0108] Taking the basic data of a C-band dual-polarization weather radar as an example, simulate the echoes of all tar...

Embodiment 3

[0110] This embodiment is a simulation of dual-polarization radar echo signals in different volume scan modes. Firstly, the dual-polarization weather radar echo signals in CS mode are simulated, and other modes are simulated based on this.

[0111] In CS mode, take the pulse repetition frequency during simulation: , the maximum unambiguous velocity at this time , and other system parameters are consistent with the parameters in the specific embodiment (1). For the echo data used in embodiment (1), the pulse repetition frequency at this time: , the maximum unambiguous velocity at this time . Therefore, in CS mode, it is necessary to The scatterers are simulated with velocity ambiguity. For example, select the reflectivity factor in the actual weather radar data: ;Doppler Velocity: ;Spectral width: ;Differential reflectivity factor: ; Differential phase: ; Zero-lag correlation coefficient: . Due to the speed at this time , so it is necessary to do speed ...

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Abstract

The invention relates to the technical field of radar simulation, in particular to a dual-polarization weather radar echo signal simulation method. The simulation method comprises a dual-polarization weather radar echo signal simulation method and a dual-polarization radar body scanning mode echo signal simulation method. The dual-polarization weather radar echo signal simulation method comprises the following steps: acquiring echo signal power of a horizontal channel and a vertical channel of a dual-polarization weather radar; carrying out complex spectrum modeling on echo signals of the horizontal channel and the vertical channel, and establishing the phase difference, the intensity difference and the correlation of the echo signals of the horizontal channel and the vertical channel; generating a time domain I / Q echo signal according to the two paths of orthogonal signals; and simulating horizontal channel and vertical channel echo signal noise and channel gain of the receiver. According to the dual-polarization weather radar echo signal simulation method, the relationship between the dual-polarization weather radar system performance parameters and the echo signals is established, and the influence of the radar performance parameters on the radar observed quantity can be simulated.

Description

technical field [0001] The invention relates to the technical field of radar simulation, in particular to a simulation method for dual-polarization weather radar echo signals. Background technique [0002] Dual polarization weather radar is currently one of the most widely used and effective tools for monitoring and early warning of disastrous weather. The main advantage of dual-polarization weather radar is that in addition to obtaining the intensity and speed information of the rainfall process, it can also invert the microphysical structure of rainfall such as the form and phase state through the polarization information obtained by detection, so as to provide quantitative measurement of rainfall, disaster The early warning of severe weather provides a rich data base. [0003] With the rapid development of meteorological services towards refinement and precision, higher requirements are put forward for the system performance, processing algorithm improvement and scanning...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40
CPCG01S7/4052
Inventor 李学华代少君步志超陈玉宝邵楠何建新唐顺仙王旭熊茂杰关宇
Owner CHENGDU UNIV OF INFORMATION TECH
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