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Detection occurs when the cell under test exceeds the threshold. In most simple CFAR detection schemes, the threshold level is calculated by estimating the noise floor level around the cell under test (CUT). This can be found by taking a block of cells around the CUT and calculating the average power level.
This takes place before Doppler CFAR detection processing. A large modulation index is needed for practical reasons. A large modulation index is needed for practical reasons. Practical systems introduce reverse FM on the receive signal using digital signal processing before the fast Fourier transform process is used to produce the spectrum.
Automatic target recognition (ATR) is the ability for an algorithm or device to recognize targets or other objects based on data obtained from sensors.. Target recognition was initially done by using an audible representation of the received signal, where a trained operator who would decipher that sound to classify the target illuminated by the radar.
Science & Tech. Sports. Weather. 24/7 Help. For premium support please call: 800-290-4726 more ways to reach us. ... Sonar image speculated to be Amelia Earhart’s long-lost plane was just a rock ...
Each system, from shore facility to the transducer array was a sonar set with the signal processing beginning as the array's signals were amplified, processed into beams by time delay and each beam processed by an electromechanical spectrum analyzer with the display being a sweep of the frequency spectrum's intensity burned across electrostatic ...
Sonar systems are generally used underwater for range finding and detection. Active sonar emits an acoustic signal, or pulse of sound, into the water. The sound bounces off the target object and returns an echo to the sonar transducer. Unlike active sonar, passive sonar does not emit its own signal, which is an advantage for military vessels.
NOAA, Kraken Robotics and ThayerMahan conducted a joint technology demonstration in 2019, [11] where synthetic-aperture sonar was one of the technologies demonstrated. Detection of carbon dioxide gas seeps has been using synthetic-aperture sonar coupled with advanced signal processing has been proven possible, and is an ongoing research topic. [12]
The EcoTarium is a science and nature museum located in Worcester, Massachusetts.Previously known as the New England Science Center, the museum features several permanent and traveling exhibits, the Alden Planetarium, a narrow-gauge train pulled by a scale model of an 1860s steam engine, and a variety of wildlife.