The existing off-board active decoys face such common technical problems as short action time, limited jamming power, and difficult control over deployment situation and effective directive jamming beam direction. For this reason, this paper introduces a new mode and process of anti-missile combat, which places the radar active decoy on an unmanned surface vehicle (USV) to collaborate with the surface warship during the off-board active anti-missile combat. Following the principles of radar terminal guidance centroid jamming, a real-time calculation method for the effective area of off-board active jamming is developed, and the jamming position maneuver strategy under the collaboration of the USV and the surface warship is proposed to implement the off-board active anti-missile combat. The proposed strategy satisfies the needs of long-time, high-power, stable, and effective off-board jamming against incoming anti-ship missiles. This paper further verifies the effectiveness of the proposed strategy in the simulated and live firing confrontations. INDEX TERMS electronic countermeasures unmanned surface vehicle (ECM USV); off-board active decoy; centroid jamming; jamming-position maneuver.
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