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Diagram of AN/SPY-3 vertical electronic pencil beam radar conex projections. X band functionality (8 to 12 GHz frequency range) is optimal for minimizing low-altitude propagation effects, narrow beam width for best tracking accuracy, wide frequency bandwidth for effective target discrimination, and the target illumination for SM-2 and Evolved Sea Sparrow Missiles (ESSM).
The frequency selection of weather radar is a performance compromise between precipitation reflectivity and attenuation due to atmospheric water vapor. Some weather radars uses doppler shift to measure wind speeds and dual-polarization for identification of types of precipitations. [3] [4] Weather radar; Wind profilers; Millimetre cloud radar ...
Steered beam radars steer a narrow beam through a scan pattern to build a 3-D picture. Examples include NEXRAD Doppler weather radar (which uses a parabolic dish) and the AN/SPY-1 passive electronically scanned array radar employed by the Ticonderoga class of guided missile cruisers and other ships so equipped with the Aegis Combat System.
It is a 3D multi-beam and multi-mode fully coherent pulse Doppler search radar which functions in the S band (2-4 GHz). It can perform both surface and aerial search simultaneously. It is designed to support anti-air and surface-gunnery systems. The antenna in the Doppler sensor has a planar array for 3D multi-beam operations and a vertical ...
Square Pair – fire control radar of the SA-5 system; Square Tie – surface search radar for small combatants and cruise missile target designation. [1] Chinese type 352. [2] Squat Eye – alternate target acquisition radar of the SA-3 system; Steel Yard – The Duga over-the-horizon radar; Straight Flush – fire control radar of the SA-6 system
In Terminal 4 at Los Angeles International Airport, a TSA officer flagged a carry-on bag with 82 consumer-grade fireworks, three knives, two replica firearms and a canister of pepper spray.
Once the radar can "look down", it is subsequently desirable to "shoot down". Various weapons systems (including guns and missiles) are then employed against designated radar targets, either relying on the aircraft's radar employing the "look down" capability (as in semi-active radar homing) or the weapon's own active radar to resolve the indicated target (as in active radar homing).
Map of Bourbon Street in New Orleans showing the locations of bollards that had been removed. / Credit: CBS News/Google Earth