Accession Number:



Mid-Latitude Mobile Wideband HF- NVIS Channel Analysis: Part 1

Descriptive Note:

Technical Report

Corporate Author:

Space and Naval Warfare Systems Center Pacific San Diego United States

Report Date:


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High-frequency HF links 2 to 30 MHz are an alternative to the cost and tactical fragility of commercial satellite communications SATCOM for beyond line-of-sight LOS links. However, standard HF systems operating over a 3-kHz bandwidth do not provide sufficient throughput for network applications. Simply increasing bandwidth does increase throughput provided the radios are properly designed for the time-varying wideband HF channel. The Wideband HF Channel is governed by the inonospheric variations caused by latitude, the night and day cycle, the direction and length of the haul, the seasons, and ionosphere disturbances. This report is the first of a series seeking a better understanding of each of these channel variations to aid in the design of wideband HF systems and the proper comparisons of different HF radios and waveforms. This report uses wideband mid-latitude HF channel soundings and 3-D ray-tracing simulations to develop a statistical model of a particular nearly vertical incidence skywave NVIS channel. The immediate application of this particular channel is for small-unit ground-mobile forces with vehicle-mounted antennas. Near-term extensions support mid-latitude short-haul 200 to 1500 km and long-haul ship-to-ship and ship-to-shore wideband HF channels. Long-term payoffs for the warfighter will be a better HF radio design, leading to increase data rates, more stable networks, reduced power requirements, and improved low probability of detection LPD.

Subject Categories:

  • Radio Communications
  • Radiofrequency Wave Propagation

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