What radio frequency band is used for AIS transmissions?

What radio frequency band is used for AIS transmissions?

• A. UHF
• B. VHF
• C. HF
• D. SHF

Answer: (B)

The frequency band used for AIS (Automatic Identification System) transmissions is VHF (Very High Frequency). AIS operates specifically in the VHF range to enable maritime vessels to communicate their position, course, speed, and other navigational information to one another and to shore stations. This frequency allows for reliable short-range communication essential for the safety and efficiency of maritime operations. VHF is particularly suitable for AIS due to its ability to penetrate the marine environment effectively while maintaining a line-of-sight communication characteristic, which is crucial in maritime contexts. The VHF band ensures that vessels within range can exchange information in real-time, enhancing situational awareness and reducing the potential for collisions. In contrast, the other frequency bands listed do not meet the requirements for AIS transmissions due to their specific characteristics and applications. UHF (Ultra High Frequency), while used for various communications, is not designated for AIS. HF (High Frequency) is typically used for long-distance communication rather than the short-range interactions necessary for AIS. SHF (Super High Frequency) is generally utilized for satellite communications and specific radar applications, making it unsuitable for the purposes of AIS.

The frequency band used for AIS (Automatic Identification System) transmissions is VHF (Very High Frequency). AIS operates specifically in the VHF range to enable maritime vessels to communicate their position, course, speed, and other navigational information to one another and to shore stations. This frequency allows for reliable short-range communication essential for the safety and efficiency of maritime operations.

VHF is particularly suitable for AIS due to its ability to penetrate the marine environment effectively while maintaining a line-of-sight communication characteristic, which is crucial in maritime contexts. The VHF band ensures that vessels within range can exchange information in real-time, enhancing situational awareness and reducing the potential for collisions.

In contrast, the other frequency bands listed do not meet the requirements for AIS transmissions due to their specific characteristics and applications. UHF (Ultra High Frequency), while used for various communications, is not designated for AIS. HF (High Frequency) is typically used for long-distance communication rather than the short-range interactions necessary for AIS. SHF (Super High Frequency) is generally utilized for satellite communications and specific radar applications, making it unsuitable for the purposes of AIS.