Abstract: The active maneuver evasion technology has presented serious obstacles for exo-atmospheric interception. Assuming that the maneuvering acceleration vector of the target is perpendicular to the Line of Sight (LOS), and that the formation of the vector is arbitrary and bounded, this paper analyzes the capture region of the Realistic True Proportional Navigation (RTPN) guidance law against the arbitrarily maneuvering target. The selection range of the navigation gain is first derived, which guarantees that the commanded acceleration of RTPN does not surpass the maneuverability limitation of the interceptor durin g the guidance process. After that, based on the inequality analysis technique, the capture region of the RTPN against the arbitrarily maneuvering target is obtained without considering the overload saturation of the interceptor. A more practical capture region of the RTPN against the arbitrarily maneuvering target is then achieved considering the maneuverability limitation of the interceptor. Finally, the theoretical findings are demonstrated by numerical simulation examples.

Key words: exo-atmospheric interception, arbitrarily maneuvering targets, RTPN, overload saturation limitation, capture region