From Repair Mobile

GAO/IMTEC-92-26 Patriot Missile Software Problem

Anomaly Observed in Patriot Range Gate

On February 11, 1991, the Patriot Project Office received Israeli data identifying a 20 percent shift in the Patriot system's radar range gate after the system had been running for 8 consecutive hours. (Figure 4 depicts the location of a Scud within the range gate after the Patriot has been in operation for over 8 hours.) [1] - thanks to fas.org more details.

GAO/IMTEC-92-26 Patriot Missile Software Problem

Patriot Project Office officials said that the Patriot system will not track a Scud when there is a range gate shift of 50 percent or more. Because the shift is directly proportional to time, extrapolating the Israeli data (which indicated a 20 percent shift after 8 hours) determined that the range gate would shift 50 percent after about 20 hours of continuous use.[2] - thanks to fas.org More details.

GAO/IMTEC-92-26 Patriot Missile Software Problem

In September 1991, officials from the Patriot Project Office stated that Patriot algorithms will continue to be re-examined as a result of experience gained during Desert Storm and will continue to be tested against aircraft, cruise, and tactical ballistic missiles. Further, an endurance test has been conducted to ensure that extended run times do not cause other system difficulties. [3] - thanks to fas.org More details.