Advanced sounding: 2. First results from an advanced chirp ionosonde


  • A. W. V. Poole,

  • G. P. Evans


A BR Communications “chirp” ionosonde has been modified to allow the measurement of the phase of ionospherically reflected echoes. The use of a dual-channel receiver and microprocessor-based control allows phase comparisons of temporally and spatially diverse echoes from which Doppler velocity, angle of arrival, and polarization mode can be evaluated, in addition to group range and amplitude. A test study of the ionosphere at Grahamstown is described.