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A pulse-Doppler radar is a radar system that determines the range to a target using pulse-timing techniques, and uses the Doppler effect of the returned signal to determine the target object's velocity. It combines the features of pulse radars and continuous-wave radars, which were formerly separate due to the complexity of the electronics .
The under secretary of commerce for oceans and atmosphere, or USC (OA), is a high-ranking official in the United States Department of Commerce and the principal advisor to the United States secretary of commerce on the environmental and scientific activities of the department. The under secretary is dual hatted as the administrator of the ...
Pulse-repetition frequency (PRF) is the number of times a pulsed activity occurs every second. This is similar to cycle per second used to describe other types of waveforms. PRF is inversely proportional to time period which is the property of a pulsed wave. PRF is usually associated with pulse spacing, which is the distance that the pulse ...
The Visakhapatnam-class destroyers, also classified as the P-15 Bravo class, or simply P-15B, is a class of guided-missile destroyers currently being built for the Indian Navy. [6] The Visakhapatnam class is an upgraded derivative of its predecessor, the Kolkata class, with improved features of stealth, automation and ordnance.
Electromagnetic interference ( EMI ), also called radio-frequency interference ( RFI) when in the radio frequency spectrum, is a disturbance generated by an external source that affects an electrical circuit by electromagnetic induction, electrostatic coupling, or conduction. [1] The disturbance may degrade the performance of the circuit or ...
The Northrop Grumman B-21 Raider is an American strategic bomber under development for the United States Air Force (USAF) by Northrop Grumman. As part of the Long Range Strike Bomber (LRS-B) program, it is to be a long-range, stealth intercontinental strategic bomber for the USAF, able to deliver conventional and thermonuclear weapons.
A NEXRAD weather radar currently used by the National Weather Service (NWS) is a 10 cm wavelength (2700-3000 MHz) radar capable of a complete scan every 4.5 to 10 minutes, depending on the number of angles scanned, and depending on whether or not MESO-SAILS is active, which adds a supplemental low-level scan while completing a volume scan. Its ...
Anti-radiation missile. An anti-radiation missile ( ARM) is a missile designed to detect and home in on an enemy radio emission source. [1] Typically, these are designed for use against an enemy radar, although jammers [2] and even radios used for communications can also be targeted in this manner. The earliest known anti-radiation weapon is a ...