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This paper details the design, simulation, implementation, and on-air testing of a prototype synchronous ALE system which has been developed at Harris Corporation. This ALE system utilizes extremely robust burst serial tone waveforms to perform all channel linking, frequency evaluation, and link termination functions. The prototype system has been used as a test-bed to both measure the robustness of the waveforms and to explore a number of different linking techniques. A number of linking techniques have been examined including a single channel 3-way link set up (LSU) as well as a number of different multi-channel techniques. The multi-channel techniques include calling on the next available frequency, calling on a specified frequency, calling on the best frequency (with implied channel sounding) and calling on the first frequency to provide a specified level of performance. The paper begins with a discussion of the advantages and disadvantages of synchronous ALE systems or networks. This is followed by an explanation on the methods utilized to generate the presented results, both software simulation and on-air testing. Next is a discussion of the burst serial tone waveform utilized by the prototype system, including simulated performance. This is followed by the presentation of a simple single frequency link-set-up (LSU) technique. Simulated and on-air performance data is presented for this technique. Next, the operation of the synchronous, multi-channel ALE system is presented, along with some on-air performance data. The paper concludes with a summation of the results. (6 pages)
The HF frequency band is well known for its many and varied disturbances and propagation difficulties. These effects combine to make the automation and control of HF communication systems very challenging. Many considerations exist for the automation of HF data systems including frequency selection and management, link establishment, voice and data delivery, and multistation network organization. Harris Corporation's RF Communications Group has developed a prototype of an automated HF communication system that addresses these concerns. This system, the Advanced HF Data System (AHFDS), combines an easy to use operator interface, a new fast automatic link establishment (ALE) technique, and a data link protocol for error free HF data delivery. The operator interface provides message editing and scheduling capabilities. The fast ALE technique provides real time frequency management and selection. Error free data transfer is achieved by use of an extremely robust data transfer mechanism consisting of US MIL-STD 188-110A serial tone HF modems coupled with a newly developed data link protocol, proposed US Federal Standard 1052 (PFS-1052). The paper includes a discussion of automated HF system techniques, and an overview of the developed AHFDS prototype with special emphasis on the fast ALE technique. The important metrics for measuring the performance of automated HF communication systems are examined, the HF channel simulator and on-air performance results of the developed prototype system are presented, and the results of the prototype effort are summarized.
