Doppler Angle of Arrival Spectral Measurement System.
Final rept. 1 Oct 71-28 Feb 73,
LOWELL TECHNOLOGICAL INST RESEARCH FOUNDATION MASS
Pagination or Media Count:
Velocity and structure of irregularities in the arctic ionosphere are measured with the Doppler Arrival Angle Spectral Measurement system DAASM in Goose Bay, Labrador. The complex amplitudes of the echo returns received at up to 24 antennas, aligned along the magnetic meridian, provide the basis for complex Fourier analysis. Sampling with eight simultaneous range gates resolves complicated echo structure. A 10 kW peak power transmitter feeds a vertically polarized log-periodic antenna pre-sited in the magnetic north direction. Pulses of 100 microsec width are transmitted at a rate of 200 or 400 pulses per second.
- Atmospheric Physics