ATP-3-09-12 Field Artillery Counterfire and Weapons Locating Radar Operations Download
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Appendix F F-4 ATP 3-09.12 26 October 2021 RADAR POSITION ANALYSIS SYSTEM F-6. Radar Position Analysis System (RPAS) is a computer program that enables the user to analyze the performance of the WLRs based on their location, orientation, and setup with respect to specified hostile or friendly weapon systems. Variations of the AN/TPQ-50, AN/TPQ-36, and AN/TPQ-53 WLRs are modeled in RPAS. Multiple versions of each WLR is supported to assist in Joint Operations planning. RPAS has multiple weapons systems available that include four main categories: recoilless rifles, mortars, artillery, and rockets. The user may construct a scenario in which up to seven WLRs are positioned. The WLRs can be analyzed individually or as a group. F-7. The RPAS Software is ideally suited for mission planning. The software allows the input of known and suspected weapon locations, possible enemy objectives, enemy weapon types, and areas of search for the WLR. This data is used to create a visual display that will determine the probability of detection, facilitating effective use of WLRs. RPAS accomplishes this based on line of sight requirements. REQUIREMENTS F-8. RPAS requires the Digital Terrain Elevation Data (DTED), manmade structures that are in the line of sight of the WLRs, and types of projectile that are anticipated or known. RPAS also supports the input of other files to provide a visual reference and to align with ground based observations. F-9. Performance assessments are generated for the hostile weapon point-to-point trajectory analyses whenever the probability of location is less than the maximum possible value of 99 percent. The purpose of the assessment is to indicate the cause(s) for less than full detection and, to possibly suggest ways in which the performance can be improved. The software will generate an advisory message to indicate factors that can affect WLR probability of detection. For example, a message may appear such as “WARNING: Search fence is very near top of elevation coverage.” Indicating a limited number of beams are available over the screening crest. F-10. With assessments, RPAS also provides a variety of outputs to evaluate WLR positioning. These outputs are referred to as plots and are displayed with color coding and provided in text format: Terrain Plot – displays terrain heights in the radar area. Screen Angle Plot – displays terrain screening angles and weapon trajectory. Elevation Plot – displays antenna elevation coverage. Clutter Plot – displays terrain clutter returns. Visibility Plot – displays target visibility with respect to the terrain. Trajectory Target-to-Interference Plot - displays the projectile target-to-interference ratio along weapon trajectory. F-11. The Trajectory Target-to-Interference Plot displays the most data in relation to the probability of detection. It will contain a color coded chart displaying if the WLR was able to acquire the target. On the margin of the plot diagram will be a text box that contains the probability of detection and the circular error of probability. RISK MANAGEMENT F-12. Risk management is the process to identify, assess, and control risks and make decisions that balance risk cost with mission benefits (JP 3-0). The risk management worksheet provides a starting point to logically track the process of assessing hazards and risks. It is used to document risk management steps taken during the planning, preparation, and execution of training and combat missions and tasks. See ATP 5-19 for additional information on risk management and worksheet.