LETTERS, Incoherent Scatter Observations at Arecibo Using Compressed Pulses

Abstract

Pulse‐compression techniques are now being used successfully in incoherent observations at Arecibo. In most observations a 13‐bit Barker code and 6‐μsec baud length are used, giving a compression ratio of 13 to 1 with very low range sidelobes and an altitude resolution of 0.9 km. A few of the first measurements with this technique are presented here and include observations of (a) the E region and sporadic E layers, (b) the D ‐region ledge near 80 km, and (c) narrow enhanced echoes associated with HF heating of the ionosphere.