Method and system for producing images of an object
First Claim
Patent Images
1. A method of producing images of an object, comprising the steps of:
- providing a satellite in line-of-sight of an object, said satellite being capable of transmitting a range-coded signal;
positioning a receiving station in view of said satellite and said object, said receiving station being sensitive to direct transmission of said range-coded signal from said satellite and reflections of said range-coded signal from said object;
introducing relative motion between said receiving station and said object;
determining range from said receiving station to said object using said direct transmission and said reflections;
determining a Doppler frequency shift history between said receiving station and said object using said direct transmission and said reflections; and
forming an image of said object using said range and said Doppler frequency shift history.
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Abstract
A method and system are provided to produce images of an object. A receiving station is positioned in view of a range-coded signal emitting satellite and the object. The receiving station is sensitive to direct transmission of the range-coded signal and reflections of the range-coded signal from the object. Both range from the receiving station to the object and a Doppler frequency shift history between the receiving station and the object is determined using the direct transmission and reflections of the range-coded signal. An image is formed using the two-dimensional record provided by the range and the Doppler frequency shift history.
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Citations
16 Claims
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1. A method of producing images of an object, comprising the steps of:
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providing a satellite in line-of-sight of an object, said satellite being capable of transmitting a range-coded signal; positioning a receiving station in view of said satellite and said object, said receiving station being sensitive to direct transmission of said range-coded signal from said satellite and reflections of said range-coded signal from said object; introducing relative motion between said receiving station and said object; determining range from said receiving station to said object using said direct transmission and said reflections; determining a Doppler frequency shift history between said receiving station and said object using said direct transmission and said reflections; and forming an image of said object using said range and said Doppler frequency shift history. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for producing images using a range-coded signal that is transmitted toward the earth from an orbiting satellite, comprising:
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receiving means positioned such that an object to be imaged is in view of said satellite and said receiving means and such that there is relative motion between said receiving means and said object, said receiving means being sensitive to a direct transmission of said range-coded signal and to reflections of said range-coded signal from said object; processing means coupled to said receiving means for determining range from said receiving means to said object using said direct transmission and said reflections, and for determining a Doppler frequency shift history between said receiving means and said object using said direct transmission and said reflections; and a device coupled to said processing means for forming an image of said object using said range and said Doppler frequency shift history. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification