In telecommunication, the term automatic link establishment (ALE) has the following meanings:
1. In high-frequency (HF) radio, the capability of a station to make contact, or initiate a circuit, between itself and another specified radio station, without human intervention and usually under processor control.
2. In HF radio, a link control system that includes automatic scanning, selective calling, sounding, and transmit channel selection using link quality analysis data.
Optional ALE functions include polling and the exchange of orderwire commands and messages.
AutomaticLinkEstablishment (ALE) is the principle where a specialized radio modem, known as an ALE adaptive controller, is assigned the task of automatically controlling an HF receiver and transmitter in order to establish the highest quality communication link with 1 or multiple HF radio stations.
Linkestablishment is dependent on many factors and is fully optimized by the use of a micro computer in the ALE controller.
ALE controllers conform to MIL-STD-188-141A linkestablishment functions and perform encoding and decoding of data by the use of an 8-ARY binary FSK modulator/demodulator.
This frequency variation is required to compensate for the changed geometric angle between points A and B caused by the expansion and constriction of the ionosphere.
The automaticlinkestablishment feature within the DSP determines which is the best operating frequency for that time of day by establishing and maintaining automaticlink quality assessments among all the stations within the network.
Automatic Vehicle Location — The United States and South American host governments are electronically map tracking over 320 drug interdiction riverine patrol boats operating throughout the Amazon basin utilizing the Micom 2E AVL feature.
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