Stabilizing method of synthetic aperture radar and position determining method thereof
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United States of America Patent
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Feb 27, 1996
Grant Date -
N/A
app pub date -
Nov 16, 1993
filing date -
Nov 25, 1992
priority date (Note) -
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Abstract
A stabilizing method of a synthetic aperture radar and a position determining method by the radar. At least three repeaters are arranged in mutually different positions on the ground or the sea and a radio frequency signal having a predetermined frequency is transmitted from the radar mounted on a radar platform such as an aircraft to the repeaters. Each repeater frequency-modulates and amplifies the received signal to return the signal to the radar. The radar receives the signal returned from each repeater. The radar calculates a distance between the radar platform and each repeater on the basis of a time required for the transmitting and the receiving and phase information of the received signal. When the position of each repeater is known, by using the positions of the repeaters and the calculated distances, the position of the radar platform can be calculated. On the basis of the obtained position of the radar platform, a reference signal for phase compensation is generated. The radar eliminates a phase variation of a reflected wave received from an object to be acquired by multiplying the reflected wave by the reference signal for phase compensation.
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