Embedded HF Channel Probes/Sounders

Many HF communication requirements could be satisfied best by systems which are capable of real time propagation monitoring; however, approaches using ancillary ionospheric sounders have resulted in configurations which are too expensive, too bulky and operationally burdensome. Real-time monitoring is especially critical on high latitude channels which suffer unique disruptions due to auroral and polar activity. This paper explores techniques which utilize a host communication´s system´s RF electronics on a non-interference (i.e. time shared) basis to produce channel measurement data superior to that obtained by conventional pulse or chirp sounders. The techniques all can be implemented using available microprocessor components, which, if already available in the host system, can result in a major increase in capability with no increase in hardware. Results from an experimental system are presented.