Showing papers by "Iain M. Reid published in 1998"
TL;DR: In this article, the development of a novel VHF radar designed to measure winds and temperatures in the planetary boundary layer is described, which operates at 54.1 MHz and is compact and easily transportable.
Abstract: The development of a novel VHF radar designed to measure winds and temperatures in the planetary boundary layer is described. The radar operates at 54.1 MHz and is compact and easily transportable. The antenna system consists of 12 Yagis grouped into three subarrays arranged in the form of an equilateral triangle. Transmission takes place on the whole array, and reception takes place on the three subarrays, with winds measured by the spaced antenna technique over a height range between 300 and 3000 m. Results from field trials conducted in southern Australia in a variety of meteorological conditions are presented. Comparisons with high-resolution radiosondes launched from the radar site show excellent agreement, with rms differences between radiosonde and radar wind components being about 1.5 m s−1. Observations carried out in rain show that echoes from precipitation are clearly distinguishable from clear-air echoes. Unlike UHF radars, this means that vertical air velocities can be measured during precipitation, and the evolution of drop-size distributions can be studied down to low altitudes. It is shown that temperatures derived from a radio acoustic sounding system are measured up to heights near 2 km, depending on background wind conditions.
47 citations
01 Jan 1998
TL;DR: In this article, a new VHF ST pro ler was installed in Mount Gambier, Southern Australia in October 2017, which employs six receiver channels allowing operation in spaced antenna SA or hybrid Doppler interferometer HDI modes.
Abstract: A new VHF ST pro ler was installed in Mount Gambier S E Southern Australia in October The pro ler employs six receiver channels allowing operation in spaced antenna SA or hybrid Doppler interferometer HDI modes In SA mode the antenna array is divided into six x subarrays which are connected to each receiving channel allowing the full correlation analysis FCA to be applied to two independent near equilateral triangles In HDI mode the array is divided into six x subarrays allowing the transmit beam to be steered o zenith and post set beam steering to be applied to form beams on reception for the application of a revised Doppler beam steering DBS technique The interferometer arrangement allows the advantage over traditional Doppler radars that the e ective beam direction resulting from the aspect sensitivity of the atmosphere can be estimated The revised DBS technique will be discussed and comparisons between the wind elds estimated using the SA FCA and HDI DBS analyses will be presented
2 citations
2 citations