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Beamforming or spatial filtering is a signal processing technique used in sensor arrays for directional signal transmission or reception. [1] This is achieved by combining elements in an antenna array in such a way that signals at particular angles experience constructive interference while others experience destructive interference.
An application of AoA is in the geolocation of cell phones.The aim is either for the cell system to report the location of a cell phone placing an emergency call or to provide a service to tell the user of the cell phone where they are.
The sonar's resolution is angular; objects further apart are imaged with lower resolutions than nearby ones. Another source lists ranges and resolutions vs frequencies for sidescan sonars. 30 kHz provides low resolution with range of 1000–6000 m, 100 kHz gives medium resolution at 500–1000 m, 300 kHz gives high resolution at 150–500 m ...
The wireless revolution has been driven by advances in radio frequency (RF), microelectronics, and microwave engineering, [12] and the transition from analog to digital RF technology, [15] [16] which enabled a substantial increase in voice traffic along with the delivery of digital data such as text messaging, images and streaming media.
Wi-Fi (/ ˈ w aɪ f aɪ /) [1] [a] is a family of wireless network protocols based on the IEEE 802.11 family of standards, which are commonly used for local area networking of devices and Internet access, allowing nearby digital devices to exchange data by radio waves.