ground wave

Thân thiện

A ground wave carries the radio signal over the horizon.

Definition

Noun: A ground wave is a type of radio wave that travels along or very close to the surface of the Earth. This propagation method is most effective for lower frequency radio signals, such as those used in AM broadcasting, and allows for reliable communication over relatively short to medium distances, especially where the terrain is favorable.

Usage

The term is used primarily in the fields of telecommunications, radio engineering, and physics to describe a specific mode of signal propagation. - Ground wave propagation is crucial for standard AM radio broadcasting. - The stability of the ground wave signal makes it valuable for certain navigation and maritime communication systems.

Examples

• The AM radio station's signal was received clearly at night via the ground wave, even though the listener was over 100 miles away.
• For reliable communication over land without using satellites, the military often relies on ground wave technology.
• The strength of a ground wave decreases with distance but is less affected by daily atmospheric changes than sky waves.

Advanced Usage

• Ground wave coverage: Refers to the geographic area reliably served by a radio transmitter using ground wave propagation.
  • The station's ground wave coverage extends to most of the surrounding counties.
• In technical analysis, the ground wave is often contrasted with the sky wave (which reflects off the ionosphere) and line-of-sight propagation.

Variants and Related Words

• Surface wave: A more general scientific term that can include ground waves but also refers to waves (like seismic or acoustic waves) traveling along boundaries between different media.
• Propagation: The manner in which a wave travels through a medium (e.g., ground wave propagation).

Synonyms

• Surface wave (in the specific context of radio propagation along the Earth's surface)

Related Concepts (Not Phrasal Verbs or Idioms)

• Sky wave: A radio wave that is reflected back to Earth by the ionosphere, enabling long-distance communication.
• Attenuation: The gradual loss of signal strength that a ground wave experiences as it travels.
• Frequency dependence: The characteristic that ground wave propagation is most efficient at low and medium frequencies (LF and MF bands).

Học thuật

Noun

1. a radio wave propagated on or near the earth's surface