radio range


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Related to radio range: Radio telemetry

radio range,

geographically fixed radio transmitter that radiates coded signals in all directions to enable aircraft and ships to determine their bearings. An aircraft or ship can determine its line of position and drift if it knows its bearing relative to the radio transmitter and the geographic location of the transmitter. By taking successive bearings on two or more radio ranges the craft can determine its geographic position. Radio ranges are usually unattended; they emit either repeated call letters or steady signals that are periodically interrupted by station identification letters in Morse code. The aircraft or ship obtains its bearings relative to the radio range by picking up these signals with a receiver having a directional antenna, usually a loop antenna. The strength of the signal received depends on the orientation of the antenna relative to the radio range. By varying the orientation of the antenna and observing the changes in signal strength, the bearing of the vehicle can be obtained. When the antenna is driven automatically, the instrument is called an automatic direction finder (ADF). Both manual and automatic direction finders are also called radio compasses, although in aircraft the radio compass usually means an ADF. Another type of radio range called an A-N range transmits two coded signals via directional antennas so that a pilot on one of four fixed courses hears a continuous tone in his or her receiver when the craft's bearing is correct; if it veers off course either a Morse A or N is heard depending on the direction in which the error is made. A very-high-frequency (VHF) omnidirectional radio range transmits a reference signal and another signal that varies from the reference according to the bearing of the receiver. Radio ranging is being made obsolete by the Global Positioning System (GPS), which uses a network of orbiting satellites to precisely locate the position of an aircraft or ship.
References in periodicals archive ?
10 Instrument Landing Systems (ILS) and 6 Doppler VHF Omnidirectional Radio Range (DVOR)
If maximum radio range of the nodes in the network is R, then we know for sure that node C can lay anywhere on the curve C1C2.
A vehicle sends a broadcast message, only those vehicles and infrastructure devices in its radio range will be able to reply with the reply message.
Radio mechanics staffed the detachment's remote transmitters, receivers and radio range stations.
The access point provides for unlimited radio range extension and can send and receive EnOcean telegrams over the Internet with a switching time of 40 ms.
ROYALSTON - In the middle of a snowstorm, out of radio range of local police dispatch, a green uniform looks every bit as good as a blue one - when one suspects a crime is being committed.
Recent improvements in the SUGV include improved radio range and network connectivity, improved environmental qualification testing, and improved imagery from the sensor to the network workstation, with an emphasis on increasing the night infrared range for target recognition and research to further reduce the weight of the system.
VOR is the acronym for Doppler Very High Frequency Omni-Directional Radio Range System.
The ability for an attacker to leverage this is dependent on their physical proximity to a potential victim, as they must be within wireless radio range.
It notes that in order to exploit the hole, an attacker would have to be able to deploy a Cisco controller within radio range of a newly installed AP.
Given the centrality of global warming to human progress, it may be prudent to fully ascertain the Earth's emission profile, by using an array of satellites which continually monitor spectral emissions from the radio range through the infrared.