Doppler weather radar can measure ( )

Doppler weather radar measures: Radial wind speed.

The upper limit of the maximum phase shift that Doppler weather radar can measure from one pulse to the next is 180° (π). The target radial velocity value corresponding to the 180° pulse pair phase shift is called the maximum unambiguous velocity Vmax.

The working principle of Doppler weather radar is based on the Doppler effect. It can measure the speed of scatterers relative to the radar, and under certain conditions, retrieve the distribution of atmospheric wind fields, vertical velocity of airflow, and Turbulence conditions, etc. This is of great significance for warning of severe convective weather.

Introduction to Doppler weather radar:

The Doppler effect is a phenomenon first discovered by the Austrian physicist J. Doppler in 1842 from a moving sound source. Doppler The working principle of weather radar is based on the Doppler effect. The specific performance is as follows: when the precipitation particles move relative to the radar transmitting beam, the difference between the high frequency of the received signal and the transmitted signal can be measured, thereby obtaining the result. required information.

Using this principle, the velocity of the scatterer relative to the radar can be measured, and under certain conditions, the atmospheric wind field, the distribution of the vertical velocity of the airflow, and the turbulence situation can be retrieved. This is of great significance for studying the formation of precipitation, analyzing small- and medium-scale weather systems, and warning of severe convective weather.

The above content refers to Doppler weather radar