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However, in most fielded systems, unwanted clutter and interference sources mean that the noise level changes both spatially and temporally. In this case, a changing threshold can be used, where the threshold level is raised and lowered to maintain a constant probability of false alarm. This is known as constant false alarm rate (CFAR) detection.
Much of the system's resistance to ECM was accomplished in the constant false alarm rate processing. [6] CFAR algorithms are used to extract signals from noisy input by looking for pulses that have higher energy than the overall noise rate. Most jammers produce what appears to be short pulses of signal spread across a wide bandwidth.
The weapon locating algorithm is an adaptive algorithm based on a modified version of the Runge-Kutta method, and uses constant false alarm rate (CFAR) techniques to detect the target accurately. The operator can choose the CFAR technique to be used to maximise the accuracy of information.
The false positive rate is calculated as the ratio between the number of negative events wrongly categorized as positive (false positives) and the total number of actual negative events (regardless of classification). The false positive rate (or "false alarm rate") usually refers to the expectancy of the false positive ratio.
A false alarm triggered an emergency landing for an American Airlines flight from Chicago to Las Vegas. Pete Syme. December 3, 2024 at 8:55 AM. An American Airlines Boeing 737.
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The L.A. County Fire Department determined that a reported plane crash off Rancho Palos Verdes was a false alarm and ended their search around 6:30 p.m. Wednesday, authorities said.
In the mid-2000s, an improved version labeled YLC-2A was deployed to the PLA. Equipped with a new Giga-flops digital signal processor, it is capable of Digital Moving Target Indication (DMTI) and Constant false alarm rate (CFAR) processing. An S-band variation called YLC-2U with similar capabilities was also developed for SAM guidance.