An analysis of terrain bias error in planetary radar altimeters
Richard F. Harrington, William D. Stanley, Langley Research Center, United States. National Aeronautics and Space Administration
National Aeronautics and Space Administration, 1969 - Technology & Engineering - 38 pages
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altitude and surface amplitude analog filter APPENDIX approximate bandwidth beamwidth bias error varies Butterworth Chebyshev Chebyshev 3-dB ripple Digital Filters equation A25 equation Dl feet meters filter poles filter type filter was varied frequency function obtained function of altitude ideal square pulse IEEE Spectrum impulse response P(t incidence angle Langley Research Center leading edge look angle Maximally flat-time maximally flat-time-delay filter maximum terrain bias Muhleman backscatter function Muhleman coefficient Muhleman ref normalized pulse response normalized time variable number of filter omnidirectional antenna one-half the reciprocal p-plane planetary angle PLANETARY RADAR ALTIMETERS planetary surface pulse-modulated radar altimeter Radar Astronomy radar cross section radar equation received power received pulse return echo shown in figure simulation step response Substitution of equation surface reflection characteristics terrain bias error three-pole Butterworth filter three-pole Chebyshev 3-dB Three-pole maximally flat-time-delay transmitted pulse transmitted pulsewidth type and number usee variation in altitude yields z-transform