Handling target obscuration through Markov chain observations

Michael A. Kouritzin; Biao Wu

doi:10.1117/12.779837

17 April 2008 Handling target obscuration through Markov chain observations

Michael A. Kouritzin, Biao Wu

Proceedings Volume 6968, Signal Processing, Sensor Fusion, and Target Recognition XVII; 69680S (2008) https://doi.org/10.1117/12.779837
Event: SPIE Defense and Security Symposium, 2008, Orlando, Florida, United States

Abstract

Target Obscuration, including foliage or building obscuration of ground targets and landscape or horizon obscuration of airborne targets, plagues many real world filtering problems. In particular, ground moving target identification Doppler radar, mounted on a surveillance aircraft or unattended airborne vehicle, is used to detect motion consistent with targets of interest. However, these targets try to obscure themselves (at least partially) by, for example, traveling along the edge of a forest or around buildings. This has the effect of creating random blockages in the Doppler radar image that move dynamically and somewhat randomly through this image. Herein, we address tracking problems with target obscuration by building memory into the observations, eschewing the usual corrupted, distorted partial measurement assumptions of filtering in favor of dynamic Markov chain assumptions. In particular, we assume the observations are a Markov chain whose transition probabilities depend upon the signal. The state of the observation Markov chain attempts to depict the current obscuration and the Markov chain dynamics are used to handle the evolution of the partially obscured radar image. Modifications of the classical filtering equations that allow observation memory (in the form of a Markov chain) are given. We use particle filters to estimate the position of the moving targets. Moreover, positive proof-of-concept simulations are included.

Citation Download Citation

Michael A. Kouritzin and Biao Wu "Handling target obscuration through Markov chain observations", Proc. SPIE 6968, Signal Processing, Sensor Fusion, and Target Recognition XVII, 69680S (17 April 2008); https://doi.org/10.1117/12.779837

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