Synthetic aperture radar system and platform position measuring apparatus used in the same
AssigneeNEC Corporation
InventorsMinoru Murata, Masanori Miyawaki
Life of this patent
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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.
Claims11
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.
A method of precisely reproducing an image in a synthetic aperture radar system comprising:
- 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.
A synthetic aperture radar system comprising:
- 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.
Dependencies are inferred from the claim text.