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 ?
Figure 1 shows a highway divided into several adjacent areas where in each of them, one RSU, having a radio range equal to R, is installed in its center.
For example, under low anchor node density, a blind node is not always able to identify three anchor nodes in the first hop and second hop, especially when the sensor moves with high velocity; this process occurs because the first hop neighbors that communicate with radio range R are unable to identify within its range the second hop sensor that communicates with radio range 2R.
The receiver and loggers in the Ultra Radio range are compatible with existing Tinytag Radio products, and can be mixed and matched within a single system.
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.
When selecting the relay set, RLMB proposes the use of a dynamic factor ([[beta].sub.rd]) to adjust the nominal radio range (NRR) according to the vehicles relative direction (rd).
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.
The radio receivers building and the radio range navigational aid were located off the field.
"As an optical astronomer it has been an interesting experience to carry out observations at the large wavelengths which occur in the radio range," Julija Bagdonaite, lead author of the publication, said.
Furthermore, the company's VHF omnidirectional radio range (VOR) and DME will provide navigation equipment for various airports, for both en-route and terminal area guidance.
As soon as our radio range allowed, we hailed Sand Sailor, the callsign at EMFK, and told them of our intentions.
The radio range of each device will vary by manufacturer and can be extended by adding signal repeaters or additional devices.