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Prior to the introduction of Wi-Fi, one of the biggest applications of the 5 GHz band was Terminal Doppler Weather Radar. [4] [5] The decision to use 5 GHz spectrum for Wi-Fi was finalized in the World Radiocommunication Conference in 2003; however, the meteorological community was not involved in the process.
Various tribes each held some individual powers locally, and each had a chief known as a weroance (male) or, more rarely, a weroansqua (female), meaning "commander". [13]As early as the era of John Smith, the individual tribes of this grouping were recognized by English colonists as falling under the greater authority of the centralized power led by the chiefdom of Powhatan (c. 1545 – c ...
Powhatan (c. 1547 – c. 1618), whose proper name was Wahunsenacawh (alternately spelled Wahunsenacah, Wahunsunacock, or Wahunsonacock), was the leader of the Powhatan, an alliance of Algonquian-speaking Native Americans living in Tsenacommacah, in the Tidewater region of Virginia at the time when English settlers landed at Jamestown in 1607.
Pulse Doppler radar may have 50 or more pulses between the radar and the reflector. Pulse Doppler relies on medium pulse repetition frequency (PRF) from about 3 kHz to 30 kHz. Each transmit pulse is separated by 5 km to 50 km distance. Range and speed of the target are folded by a modulo operation produced by the sampling process.
The DOW program rapidly expanded and evolved to include the first mobile dual-Doppler radar network, the first mobile rapid-scan radar (the Rapid-Scan DOW, RSDOW), [1] and the first quickly-deployable 1-degree C-band radar, the C-band on Wheels (COW).
Unambiguous Doppler processing becomes an increasing challenge due to coherency limitations as PRF falls below 3 kHz. For example, an L-Band radar with 500 Hz pulse rate produces ambiguous velocity above 75 m/s (170 mile/hour), while detecting true range up to 300 km. This combination is appropriate for civilian aircraft radar and weather radar.
Synthetic-aperture radar (SAR) is a form of radar that is used to create two-dimensional images or three-dimensional reconstructions of objects, such as landscapes. [1] SAR uses the motion of the radar antenna over a target region to provide finer spatial resolution than conventional stationary beam
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