Relative targeting architectures for captive-carry HIL missile simulator experiments

Captive-carry electronic warfare (EW) tests evaluate the response of hardwa re-in-the-loop (HIL) missile seekers to an actual environment (test-range) including the presence of electronic attack. This paper describes a relativ e targeting architecture that displays the test-range results in geodetic c oordinates using only the sensors available on board the captive-carry plat form (GPS, INS, seekers). To derive the target position in geodetic coordin ates, a lever-arm correction process is described that determines the posit ion of each seeker and the corresponding pitch and yaw of the simulator. Co mbining the positional parameters of the seeker with its targeting variable s, the seeker track point is displayed in geodetic coordinates. A track tag ging algorithm is presented to identify the true target from the EW disrupt ion using the drift angle from the inertial navigation system (INS). To eli minate the scintillation noise present In the track image, a Kalman filter in sensor coordinates is applied to the targeting variables allowing optimi zation of the track tagging. Experimental results from a recent EW field te st using antiship cruise missile simulators are shown to demonstrate the fe asibility of the approach for determining EW effectiveness in near real-tim e. Targeting accuracy is also quantified by comparing the derived target po sition with the true Global Positioning System (GPS) test-range position of the ship in the absence of electronic attack.