line of sight


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line of sight

[′līn əv ′sīt]
(electromagnetism)
The straight line for a transmitting radar antenna in the direction of the beam.
(science and technology)
A straight, unobstructed path or line between two points, as between an observer's eye and a target.

line of sight, line of collimation

The line extending from an instrument along which distant objects are seen, when viewed with the telescope or other sighting device. Also see sight line.

line of sight

An unobstructed path from a transmitting device to the receiver. Users are aware of line of sight when they aim their infrared (IR) remote control directly at the TV. Microwave transmissions between towers at the top of mountains and buildings require unobstructed line of sight. See IR remote control.

Any Radio Frequency
Technically, line of sight refers to radio frequency (RF) transmission in general, including Wi-Fi and cellular. Although walls and other obstructions may attenuate (lessen) or block signals entirely, the receiving device must be in the radiation pattern emitted by the transmitter, which is also considered line of sight. See RF.
References in periodicals archive ?
Astronomers may be fooling themselves to think that all these blobs are moving in the line of sight.
The Orb'Phone Exchange is the first and only non-line-of-sight communications technology that enables users of the Iridium(R) satellite network to quickly and easily establish highly reliable voice and data communications to and from any location where the user is unable to gain line of sight to an orbiting Iridium Satellite such as on board in-flight aircraft, within buildings, under ground or from obstructed areas.
The Company's specialties include the design and manufacture of advanced products and networks used for transmission of voice, data and video using satellite, over-the-horizon microwave, terrestrial line of sight and other wireless communications systems.
The company's technology significantly improves spectral efficiency, ability to operate in non line of sight environments and reliability to meet the needs of leading equipment vendors and their customers.
In addition to providing more reliable links to subscribers that are not in a direct line of sight, OFDM delivers more revenue earning bits per radio channel and more revenue earning subscribers per base station than existing technologies.
The DHFCS program will deliver beyond line of sight high frequency (HF) communication services to the three armed services and other authorized users.