A Study of Extrapolation Nowcasting Based on IVAP-Retrieved Wind

In this study, we propose a new way to obtain motion vectors using the integrating velocity–azimuth process (IVAP) method for extrapolation nowcasting. Traditional tracking methods rely on tracking radar echoes of a few time slices. In contrast, the IVAP method does not depend on the past variation of radar echoes; it only needs the radar echo and radial velocity observations at the latest time. To demonstrate it is practical to use IVAP-retrieved winds to extrapolate radar echoes, we carried out nowcasting experiments using the IVAP method, and compared these results with the results using a traditional method, namely, the tracking radar echoes by correlation (TREC) method. Comparison based on a series of large-scale mature rainfall cases showed that the IVAP method has similar accuracy to that of the TREC method. In addition, the IVAP method provides the vertical wind profile that can be used to anticipate storm type and motion deviations.

Metodologia Baseada em Inteligência Computacional para Rastreamento de Foguetes Suborbitais por Triangulação de Antenas

In order to track a suborbital vehicle, some tracking system are used. Tracking radar can be used for this purpose. This paper presents a method using triangulation of antennas other than radars, for estimating the position of the vehicle. The goal is to improve the capability of keeping tracking the vehicle, even in loss of signal scenarios. Also, a dynamic filter is proposed for improving the estimation accuracy, based on a fuzzy system identification. Simulations were performed to demonstrate the proposed methods in estimating a suborbital vehicle position.

POSSIBILITIES OF REDUCING AIRSPACE REVIEW TIME WHEN DETECTING AND TRACKING RADAR TARGETS

This article considers possible ways to reduce the time of air space survey by an onboard radar station in comparison with the known «classical» methods. The main direction of the proposals is related to the division of the entire sector of the airspace survey into severalrange zones. The division of the survey sector into three zones in accordance with the classification of the range of air-to-air missiles is justified. The calculation of the time of review of a given area of airspace for the proposed methods and comparison with the time of review of a similar zone with a needle beam, which showed the possibility of reducing the review time to two times, mainly when viewing the near and middle zones.The possibility of using different beams for radiating and receiving signals is considered.