Patent ID: 7375676
Filing Date: 2008-05-20
Classification: G01S

Abstract:
1. A method for sensing remote targets in the presence of interfering signals, said method comprising the steps of: radiating energy toward said target, and sensing reflected energy containing amplitude and phase information relating to said target, for generating received energy signals which may be contaminated by pulsed interference and by clutter signals at Doppler frequencies including clutter frequencies; generating time-distribution signals characterizing the time-distributions of said pulsed interference within said received energy signals; from said time-distribution signals, generating measurement signals representing normalized amplitudes of said pulsed interference in a Doppler frequency region free of clutter signals; from said time-distribution signals, generating correction signals representing normalized pulsed interference over the entire Doppler frequency region; processing said received energy signals with said measurement signals to generate clutter-free interference signals representing phases and amplitudes of said pulsed interference; using said clutter-free interference signals to adjust the amplitudes and phases of said correction signals to generate estimated pulsed interference; subtracting said estimated pulsed interference from said received energy signals to produce received energy signals nominally free of pulsed interference and nominally including clutter signals; and applying said received energy signals nominally free of pulsed interference and nominally including clutter signals to a pulse-Doppler filter to produce received energy signals nominally free of pulsed interference and nominally free of clutter signals.