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Signaling over skywave ionospheric links with a sufficiently wide instantaneous bandwidth resolves the multipath from multiple propagation modes and permits single-mode channel measurements. These measurements exhibit the effect of fluctuations due to ionospheric irregularities, which are relatively small, especially for mid-latitude, undisturbed paths.This paper presents the results of recent channel measurements on a 2000 km mid-latitude path between Florida and Massachusetts using a 1 MHz bandwidth direct-sequence pseudo-noise (DSPN) probing signal. The channel impulse response is extracted by correlating the received probe signal with a local DSPN reference. Doppler information is obtained by Fourier transforming a succession of these impulse responses. The channel is characterized in terms of its time and Doppler spread, and autocorrelation and distribution functions of the received power.

Massachusetts, under Contract No. F19 (628)-68-C-0365. The project involved a vertical HF sounder using a linear FM waveform and employing computer-controlled real time correction for ionospheric distortions. REVIEW AND APPROVAL This technical report has been reviewed and is approved.

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