Abstract

Aiming at the problems in the bearing-only tracking (BOT) of underwater weak target in the presence of interferers, such as discontinuity of tracking trajectory and target loss, a novel joint algorithm based on interference suppression (IS) and Kalman filter (ISKF) is proposed in this paper. In the proposed algorithm, in order to smooth the corrupted trajectory of weak target and improve the precision of tracking, a feedback structure which connects IS module and Kalman filter (KF) module is built. Furthermore, the feedback structure renders the measured results of bearing trajectory shareable mutually between IS module and KF module in real-time. In ISKF joint algorithm, IS module is employed as a preprocessing module to eliminate the power of interferers, and KF module is employed as tracker to obtain the bearing trajectory of weak target. In the initial step, the coarse target bearing and interference bearing are estimated using the conventional beamforming (CBF) method. In the updated step, the precise BOT trajectory of weak target is jointly updated using IS and KF. Moreover, when the target intersects with the interference, the ISKF joint algorithm can still track the weak target effectively with the aid of prediction model of KF. Finally, the sea trial results show that the proposed algorithm can achieve more accurate and robust real-time tracking than KF only, which benefits from the feedback between the IS module and the KF module.

Highlights

  • Tracking a weak target of interest (TOI) under the circumstance of many other strong targets is a valuable research in the field of passive sonar

  • By returning the bearing result of Kalman filter (KF) tracker into interference suppression (IS) in real time, we show that the bearings of interferers can be determined in every updated step, the effectiveness of the IS for interferers with high maneuverability can be guaranteed in a simpler and cheaper way

  • RESULTS the performance of interference suppression and Kalman filter (ISKF) joint algorithm in weak target tracking is verified by processing real sea trial data

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Summary

Introduction

Tracking a weak target of interest (TOI) under the circumstance of many other strong targets is a valuable research in the field of passive sonar. Oftentimes, for the majority of passive sonar, the basic parameter that can be provided is the bearing measurement of likely targets, which means the bearing-only tracking (BOT) [4]–[6] is its generally working mode This kind of one-dimensional working mode makes the task of weak target tracking become more challenging [7]. In this context, the bearing trajectory of the weak target measured by passive sonar has some inevitable shortcomings, The associate editor coordinating the review of this manuscript and approving it for publication was Mohammad Zia Ur Rahman. In order to acquire a good tracking trajectory, it is extremely necessary to suppress interference when tracking a weak TOI

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