The bandwidth-duration product of the received radar signal as a criterion for observing wind field inhomogeneity

Abstract

The coherent mode meteorological radars applicability to recognizing weather hazard associated with wind fields inhomogeneity is analyzed. It is noted that for the aviation weather service the estimates of the received reflections spectral characteristics prove to be little informative. Problems that hinder the use of these phenomena detection results have been identified. It is proposed that new methods based on estimates of the reflected signal spectrum width and methods based on the detection of the complexity of the received signal, which is the sum of two reflections from different air masses with different characteristics, should be used for this purpose. As an indicator of this complication, it is assumed to use the bandwidth-duration product, which is a product of its energy spectrum width by the interval of its amplitude correlation. The theoretical calculation results of the bandwidth-duration product, which spectrum consists of two Gaussian form components, for different values of average frequency and/or width, are given. The received data allow asserting that the bandwidth-duration product practically does not change at small differences of Doppler shifts of signal components, but very sensitively reacts to a difference in a spectrum width, i.e. in the most interesting cases for a solved problem.