Citation
Abstract
A computer program to extract integrated doppler spectra of planetary radar returns is described. The program input data are discrete, complex-valued time series obtained for each of 64 range gates. Fhe data record is subdivided into successive subseries of 256 time-points, and each 256-point time series is discreteFourier-transformed using the fast Fourier transform (FFT). Power spectra are obtained by magnitude-squaring. The power spectra, containing positive- and negative-frequency doppler components, are assumed statistically stationary during receive-runs of 10 to 15 minutes duration, and so may be (SNR)-enhanced by integration (summation) of successive 256-point power spectra. Program output is a highly compressed power spectrum tape containing 64 integrated spectra, together with identification and parameter values, for all receive runs made during each day of a total of six days of radar observations of the planet Mercury in calendar year 1974. Brief discussions of the on-site data-taking process and the doppler interpretation of the discreie Fourier transform are included.
Details
- Volume
- 42-29
- Published
- October 15, 1975
- Pages
- 86–94
- File Size
- 930.0 KB