ATP-3-09-12 Field Artillery Counterfire and Weapons Locating Radar Operations Download
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Appendix J J-8 ATP 3-09.12 26 October 2021 Figure J-4. Radar track beam cross section Note: The software uses the radar beams as a pathway for monitoring projectiles passing through the detection area. J-39. There are three possible outcomes when an object passes through the search fence and the radar transmits the verification or tracking beam. The outcomes are miss, hit, or plot. A miss occurs when the projectile strikes none of the individual beams in the track cluster. A hit is indicated when at least one beam in the track cluster is struck, but not all. A plot occurs when the following conditions happen: All four beams of the track cluster detect the object. The detected range of the object is within 75 meters of the predicted range. The detected azimuth is within 20 mils of the predicted azimuth. The detected elevation is with 15 mils of the predicted elevation. J-40. When the software achieves an adequate number of plots it computes a solution for the POO and POI. The number of plots required to achieve a solution varies based on WLR type, which include the initial detection range and the tracking time. In general, the AN/TPQ-36 needs between 3-15 plots depending on the reasons for track termination. J-41. Figure J-5, on page J-9, summarizes the tracking process: Step 1. Object breaks the radar's search fence. Step 2. Radar verifies that object has ballistic characteristics. Step 3. Radar tracks object along its predicted trajectory.