ATP-3-09-12 Field Artillery Counterfire and Weapons Locating Radar Operations Download
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AN/TPQ-36 Weapons Locating Radar Systems Characteristics and Employment 26 October 2021 ATP 3-09.12 J-13 Long-range rocket - 70 meters or .4% of range, whichever is greater. The maximum 90% target location errors by projectile type are: All cannon - 90 meters or .9% of range, whichever is greater. Long-range rocket - 175 meters or 1% of range, whichever is greater. J-51. Table J-1 (50%) and table J-2 (90%) target location error data. Table J-1. AN/TPQ-36 maximum 50% target location error Target Category 4km 10km 20km Ranges 22km 25km 30km 37km 50km Mortar N/A N/A N/A N/A N/A N/A Cannon 35m 35m 70m 77m 88m 105m Rocket 70m 70m 80m 88m 100m 120m 148m 200m km – kilometer m – meter Table J-2. AN/TPQ-36 maximum 90% target location error Target Category 4km 10km 20km Ranges 22km 25km 30km 37km 50km Mortar N/A N/A N/A N/A N/A N/A Cannon 90m 90m 180m 198m 225m 270m Rocket 175m 175m 200m 220m 250m 300m 370m 500m km – kilometer m – meter AN/TPQ-36 FRIENDLY MODE J-52. The AN/TPQ-36 requires separate modes to conduct friendly fire. Hostile and friendly fire cannot be performed simultaneously with this system. J-53. The methodology used by the AN/TPQ-36 to search, verify, and track an impact or burst location in the friendly mode is the same as that for the hostile mode. The major differences are the size of the search fence, angle-T, and orientation of the detection area. In friendly fire mode, the WLR tracks projectiles as they travel away from the WLR. Therefore, the WLR detects and tracks the projectile on the descending leg of its trajectory. The detection area in the friendly mode is significantly smaller since the search sector must be narrowed to approximately 440 mils. J-54. When operating in friendly fire mode, the WLR sets up a horizontal "window" through which the projectile must pass. The window is referred to as the friendly fire search fence. The narrowed search fence provides the best probability of detecting and tracking friendly rounds fired. The WLR tracks projectiles until an airburst is detected, the selected datum plane altitude is intersected, or the radar has enough data to predict the POI. J-55. In the optimum friendly fire radar-tracking situation for the AN/TPQ-36, the angle (angle-T) made by the radar-orienting point (radar-target) line and the gun-orienting point (gun-target) line is from 800 to 1200 mils. See figure J-10.