Synthetic aperture radar system and platform position measuring apparatus used in the same
First Claim
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1. A synthetic aperture radar system fluctuation compensating apparatus comprising:
- a synthetic aperture radar mounted on a flying unit;
a data acquiring unit for acquiring reception data by said synthetic aperture radar;
a position measuring unit for measuring a position of said flying unit to generate position data; and
a position determining unit for determining a correct position of said flying unit based on said reception data and said position data to generate compensated position data, said position determining unit including;
a compression processing unit for performing a range compressing process on said position data to generate range compression data;
an extracting unit for extracting a reflection signal from said range compression data;
an error calculating unit for performing an unlapping process and a smoothing process on said reflection signal in phase to generate an unlapped signal, and then calculating said range error based on said unlapped signal; and
a position calculating unit for calculating said compensated position data indicative of a position of said flying unit from said range error.
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Abstract
A synthetic aperture radar system fluctuation compensating apparatus includes a synthetic aperture radar mounted on a flying unit, a data acquiring unit, a position measuring unit and a position determining unit. The data acquiring unit receives a reception data by the synthetic aperture radar. The position measuring unit measures a position of the flying unit to generate a position data. The position determining unit determines a correct position of the flying unit based on the reception data and the position data to generate a compensated position data.
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Citations
11 Claims
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1. A synthetic aperture radar system fluctuation compensating apparatus comprising:
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a synthetic aperture radar mounted on a flying unit;
a data acquiring unit for acquiring reception data by said synthetic aperture radar;
a position measuring unit for measuring a position of said flying unit to generate position data; and
a position determining unit for determining a correct position of said flying unit based on said reception data and said position data to generate compensated position data, said position determining unit including;
a compression processing unit for performing a range compressing process on said position data to generate range compression data;
an extracting unit for extracting a reflection signal from said range compression data;
an error calculating unit for performing an unlapping process and a smoothing process on said reflection signal in phase to generate an unlapped signal, and then calculating said range error based on said unlapped signal; and
a position calculating unit for calculating said compensated position data indicative of a position of said flying unit from said range error. - View Dependent Claims (2, 3, 4, 6, 7, 9, 10, 11)
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5. A method of precisely reproducing an image in a synthetic aperture radar system comprising:
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transmitting a transmission signal from a synthetic aperture radar mounted on a flying unit;
receiving reception data by said synthetic aperture radar;
measuring a position of said flying unit to generate position data;
determining a correct position of said flying unit based on said reception data and said position data to generate compensated position data, said position determining including;
performing a range compression process on said position data to generate range compression data;
extracting a reflection signal from said range compression data;
calculating a range error based on said reflection signal by performing an unlapping process and a smoothing process on said reflection signal in phase to generate an unlapped signal, and then calculating said range error based on said unlapped signal; and
calculating said compensated position data indicative of a position of said flying unit from said range error; and
reproducing an image from said reception data based on said compensated position data.
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8. A synthetic aperture radar system comprising:
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a synthetic aperture radar mounted on a flying unit;
at least three electromagnetic wave reflectors provided in a measurement object region at different positions;
a data acquiring unit for acquiring reception data reflected from said three electromagnetic wave reflectors by said synthetic aperture radar;
a position measuring unit for measuring a position of said flying unit to generate position data; and
a position determining unit for determining a correct position of said flying unit based on said reception data and said position data to generate compensated position data, said position determining unit including;
a compression processing unit for performing a range compressing process on said position data to generate range compression data;
an extracting unit for extracting a reflection signal from said range compression data;
an error calculating unit for performing an unlapping process and a smoothing process on said reflection signal in phase to generate an untapped signal, and then calculating said range error based on said unlapped signal; and
a position calculating unit for calculating said compensated position data indicative of a position of said flying unit from said range error.
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Specification
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Current AssigneeNEC Corporation
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Original AssigneeNEC Corporation
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InventorsMiyawaki, Masanori, Murata, Minoru
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Primary Examiner(s)Sotomayor, John B.
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Application NumberUS09/340,425Time in Patent Office638 DaysField of Search342/197, 342/191, 342/196, 342/195, 342/192, 342/25, 342/194US Class Current342/25.00RCPC Class CodesG01S 13/9019 Auto-focussing of the SAR s...G01S 5/14 Determining absolute distan...
