84th RADES optimizes TPS-75, AF’s primary ground deployable radar Published Oct. 28, 2021 By Deb Henley, 505th Command and Control Wing 84th Radar Evaluation Squadron HILL AIR FORCE BASE, Utah -- The Control and Reporting Center team at the 84th Radar Evaluation Squadron, Hill Air Force Base, Utah, evaluated the U.S. Air Force's primary ground deployable radar, the TPS-75 at the Oregon Air National Guard's 116th Air Control Squadron, Camp Rilea, Oregon, Sept. 7 – 24. The CRC team has a unique mission working on the U.S. Air Force's primary ground deployable radar, the TPS-75, for the entire Department of Defense fleet. The team also directly supports testing and development of the next generation of ground based deployable radars, which is currently the Three-Dimensional Expeditionary Long-Range Radar, or 3DELRR, program. The three-week TPS-75 baseline evaluation and optimization at the Oregon ANG's 116th ACS was comprised of strenuous testing, air traffic analysis using RADES organic software, and optimization of radar parameters. "The CRC team ensures the legacy CRC radar system is operating at its maximum capabilities while ensuring the future of command and control is realized," said Tech. Sgt. Jeremy Tharp, 84th RADES radar systems evaluator. The team's first week out in the field was focused on revealing the current performance of the radar, ensuring all the baseline parameters are optimized for peak TPS-75 performance and performing the site evaluation. The survey team used their advanced 3D terrestrial laser scanner to capture all of the terrain features and identify obstructions that might interfere with the performance of the radar. "The TLS sends out hundreds of thousands of laser pulses a second, and as the laser bounces off an obstruction, the beam returns to the machine," said Staff Sgt. Kerry Moody. "Based on the number of data points collected and the reflectance of the object, the scanner can then build a 3D model of the terrain surrounding the radar site." To achieve the millimeter accuracy, the survey team requires roughly 60-100 scan positions used in the final survey. "The survey will have over a billion data points, and each point will have very specific information like latitude and longitude, elevation, and temperature," said Moody. "The completed survey is used to create radar coverage diagrams which depict that specific radar's ability to track aircraft" Jason Kaas, 84th RADES site evaluation section lead. "For instance, if our diagrams predict that a radar should see an aircraft at a specific azimuth, altitude, and distance from the radar, then the technical advisors and radar technicians will use that information during the optimization process to ensure the system is operating at the highest capability." Once the baseline was set, the team ensured the antenna itself was as level as possible using a gunner's quadrant, a portable leveling instrument, which enabled them to achieve a precise level of the TPS-75. "This process resulted in better height distinction and detection, while also ensuring the tilt-sensor circuit was as accurate as possible for targets' heights when it compensates for possible tilt as the antenna spins which are caused by high winds or crosswinds," said Tharp. The second week was primarily devoted to utilizing specialized tools within the Radar Analysis Support System for Sites, or RASS-S; many in-depth tests were accomplished using RASS-S and various specialized equipment. Most importantly, the team confirmed the sensitivity and bandwidth of the receivers and the strength and roll off of the sensitivity time constants, which ensures the receivers will not be overwhelmed by noise. According to Tharp, the TPS-75 is a legacy system, and the team must always adapt, troubleshoot, and help repair the system as needed. ”The work the 84th RADES professionals do on a daily basis enable our homeland defense mission. While newer systems are coming, keeping the existing systems operating at peak performance is a daunting task this team does very effectively,” said Col. Adam Shelton, 505th Test and Training Group commander, Hurlburt Field, Florida. “Based on organically developed software and decades of experience, the CRC team is truly the linkage between today’s systems and tomorrow’s innovation.” The team used the recorded data and compared performance between recordings and setting tweaks to ensure the radar had the best possible settings for target detection, height reinforcement, and small target detection. "The CRC team has decades of TPS-75 experience and is highly adaptable and always completes the mission to the highest standard," said Master Sgt. Adam Hodgdon, 84th RADES superintendent, radar evaluation flight. The 84th RADES at Hill AFB, Utah, reports to the 505th TTG, assigned to the 505th Command and Control Wing; both are headquartered at Hurlburt Field, Florida.