초록 ▼

A synthetic aperture radar in which radial motion compensation is provided by a monopulse null tracking loop which tracks the null position of a stabilized monopulse antenna, and in which tangential motion compensation is provided by a tangential velocity measurement loop which tracks the cross-over

A synthetic aperture radar in which radial motion compensation is provided by a monopulse null tracking loop which tracks the null position of a stabilized monopulse antenna, and in which tangential motion compensation is provided by a tangential velocity measurement loop which tracks the cross-over angle of the monopulse antenna pattern. Since the motion compensation for the synthetic aperture radar is made in relation to a stabilized monopulse antenna, the imaging process for the synthetic aperture radar may be controlled in response to the angular scan rate of the antenna.

대표청구항 ▼

A method for compensating for the radial motion of a synthetic aperture radar which correlates the echo returns of a microwave signal propagated from a stabilized monopulse antenna to form an image of the reflecting surface, said method comprising: averaging the phase of a predetermined number of th

A method for compensating for the radial motion of a synthetic aperture radar which correlates the echo returns of a microwave signal propagated from a stabilized monopulse antenna to form an image of the reflecting surface, said method comprising: averaging the phase of a predetermined number of the echo returns contained within a given frequency bandwidth to provide prefilter beam segments; tracking a predetermined amplitude of the echo return signals to determine the angle between the direction of the prefilter beam segments and the directioN of the predetermined value of the echo return signals; and compensating for the phase shift in the echo returns caused by the doppler frequency imposed on the return signals by the radial motion of said synthetic aperture radar in response to the angle between the direction of the prefilter beam segments and the direction of the predetermined value of the echo return signals.