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Radar systems often use a combination of TOA and AOA to determine a backscattering object's position using a single receiver. In Doppler radar , the Doppler shift is also taken into account, determining velocity rather than location (though it helps determine future location).
Each position/object/item packet can use any of several hundred different symbols. Position/objects/items can also contain weather information or can be any number of dozens of standardised weather symbols. Each symbol on an APRS map can display many attributes, discriminated either by colour or other technique. These attributes are: Moving or ...
Radio navigation or radionavigation is the application of radio waves to determine a position of an object on the Earth, either the vessel or an obstruction. [1] [2] Like radiolocation, it is a type of radiodetermination. The basic principles are measurements from/to electric beacons, especially
That is the same as a stationary object, which renders the system blind to objects traveling at this radial velocity. MTI requires 3 or 4 pulses to reduce the effect of blind velocities. Multi-pulse strategies use staggered pulses with irregular pulse repetition intervals to prevent signal cancellation on moving objects.
Radar transmission frequency spectrum of a cosine pulse profile. Similarly, the use of a cosine pulse profile has an even more marked effect, with the amplitude of the sidelobes practically becoming negligible. The main lobe is again increased in amplitude and the sidelobes correspondingly reduced, giving a significant improvement in performance.
Frequency agility is the ability of a radar system to quickly shift its operating frequency to account for atmospheric effects, jamming, mutual interference with friendly sources, or to make it more difficult to locate the radar broadcaster through radio direction finding.
Pulse-Doppler signal processing is a radar and CEUS performance enhancement strategy that allows small high-speed objects to be detected in close proximity to large slow moving objects. Detection improvements on the order of 1,000,000:1 are common. Small fast moving objects can be identified close to terrain, near the sea surface, and inside ...
Broadcast translator, rebroadcasting a radio signal at a different frequency; Translation (physics), movement that changes the position of an object, moving every point the same distance in the same direction, without rotation, reflection or change in size; Translation operator, an alternative name for the displacement operator in quantum optics