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Rao B.,State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronic and Information Systems | Rao B.,National University of Defense Technology | Zong Z.-W.,State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronic and Information Systems | Zong Z.-W.,National University of Defense Technology | And 2 more authors.
IET Conference Publications | Year: 2013

A track-before-detect (TBD) algorithm based on elliptical Hough transform (EHT) is presented for jointly detecting and tracking weak ballistic targets during its exoatmospheric flight. The new method makes use of the fact that the ballistic target follows the elliptical orbit when restricted to two-body problem. The relationship between raw radar measurements in the data space and the elliptical parameters in the parameter space is established with coordinate transformations. The EHT detection algorithm is designed and the orbit planarity is also considered to reduce the noise accumulation effect. The detection performances related to primary and second thresholds and signal-to-noise ratio (SNR) are analyzed and verified through simulations. The advantage of the new method lies in it can not only detect and track weak ballistic targets but also can predict the impact point by using available parameters. Source


Chen Q.,State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronic and Information Systems | Yang M.,State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronic and Information Systems | Wang M.,State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronic and Information Systems | Liu L.,State Key Laboratory of Complex Electromagnetic Environmental Effects on Electronic and Information Systems
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2012

According to the dynamic flight test data and experience, multi-rules of equivalent calculation on operating range of infrared warning-reconnaissance system were set up based on the reasonable and simplified model. The rules are as follows: firstly, the infrared radiation comes mostly from the surface of the approaching plane, and secondly taking into account spectrum distribution, then the plane is considered as point target, finally the improved SNR formula is used. The influence of target radiation, atmospheric background radiation, path radiation, the radiation of optical system and the section change of the plane were proposed synthetically, the operating range model of infrared warning-reconnaissance system was build, and then the equivalent calculation expressions on operating range of infrared warning-reconnaissance system was derived. In the end, the atmospheric permeation rate and the background radiation in the position of target were calculated and the operating range in different typical conditions was derived from equivalent calculation using MATLAB associated with LOWTRAN program, and the influence of the temperature, humidity and visibility was analyzed simultaneously. Source

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