Abstract
Using the scattering characteristics of particles to simulate the radar echo can supply the test signals close to the real precipitation echo for the weather radar and save the time and cost of the research and development and maintenance of the weather radar. In this paper, the precipitation echo of weather radar is simulated based on the theoretical basis that the falling raindrops have a shape well approximated by an oblate spheroid in the atmosphere. The Marshal-Palmer distribution is applied to describe the raindrop spectrum distribution of precipitation particles. It is assumed that the raindrop particles of different sizes have the random distribution in the radar resolution volume, and then the spatial distribution of precipitation particles in the resolution volume is modeled. The echo signals of horizontal and vertical polarization channels of dual-polarization weather radar are obtained by vector superposition of backscattering echoes of each particle. The experimental results show that this method can describe the microphysical characteristics of precipitation particles more completely and can be used to test the signal processing module of dual-polarization Doppler weather radar.
Highlights
The signal receiving and processing part is one of the core parts of the Doppler weather radar system, and its technical indicators play an extremely significant role in the performance evaluation of the radar
4 Conclusions In this paper, the simulation of precipitation echo of dual-polarization weather radar is realized by using the theoretical basis that the falling drops are not spherical but have an oblate spheroidal shape at the atmosphere
The Marshall-Palmer distribution is used to describe the raindrop spectrum distribution of precipitation particles, and it is assumed that the raindrop particles have random distribution in the radar resolution volume; the spatial distribution of precipitation particles in the radar resolution volume is modeled
Summary
The signal receiving and processing part is one of the core parts of the Doppler weather radar system, and its technical indicators play an extremely significant role in the performance evaluation of the radar. In the process of production and research and development of the weather radar, the evaluation of the signal processing performance of radar receiver is an indispensable link In this process, it is essential to provide an effective signal source for weather radar. If we can simulate the echo sequence received by the real weather radar, can it optimize the design parameters of the radar system, and help to improve the performance and advance the research and development efficiency of the weather radar. The atmospheric field consists of many small particles, each of which corresponds to a vector echo signal, and the radar echoes are presented by superposition of these vector signals This simulation method only provides the spectral moments
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