CINRAD/SA雷达中微波器件故障判别     

汤建国  周红根  周良  赵东 《气象科技》2011,39(2):222-226

雷达系统中有许多微波器件,在各个通道中起不同的作用,认识这些器件的形态、功能、原理以及故障判别对现场保障人员来说非常重要。文章对CINRAD/SA雷达的接收机保护器、声体波微波延迟线、无源限幅器、波导开关在功能原理以及技术指标和故障表现形式作了较为详细的介绍,目的是为了对系统有更进一步的了解和进行故障判别。  相似文献   

Study of a Horizontal Shear Line over the Qinghai–Tibetan Plateau and the Impact of Diabatic Heating on Its Evolution     

Qin Guan  Xiuping Yao  Qingping Li  Yuancang Ma  Honghua Zhang 《Acta Meteorologica Sinica》2018,32(4):612-626

Based on the 4 times daily 0.75° × 0.75° ERA-Interim data, the structural evolution of a Qinghai–Tibetan Plateau horizontal (east–west-oriented) shear line (TSL) during 15–19 August 2015 and the effect of diabatic heating on its evolution were analyzed. The results show that the TSL possessed a vertical thickness of up to 1.5 km (approximately 600–450 hPa), and was baroclinic in nature. Weak ascending motions occurred near the TSL, accompanied with more significant gradients in dew point temperature than in temperature. The TSL was characterized by diurnal variations in its appearance and structure. It was relatively full in shape (broken) and was the lowest (highest) in vertical extent at 0000 (1800) UTC, and veered clockwise (anticlockwise) during 0000–0600 (1200–1800) UTC. When the north–south span of the TSL increased, it was prone to fracturing; and it disappeared when the dew point temperature gradients to its either side decreased. When the TSL moved northward (southward), its western (eastern) section broke up, while the eastern (western) section inclined to regenerate or merge. The TSL tended to move towards the positive vorticity areas with significant increases in vorticity. When the positive vorticity center moved down, the height of TSL decreased. Further analysis shows that the plateau surface heating dominated the vorticity attribute of the TSL and its movement, with different contributions from local variation, horizontal advection, and vertical advection of the diabatic heating to the TSL at different heights.  相似文献