Passive ranging using global positioning system
First Claim
1. A method for determining distance from a target to an observation station using a Global Positioning System satellite as a radiation source, said method comprising the steps of:
- pointing an observation station located first receiver directional antenna toward said target and receiving reflected position determinative satellite radio frequency signals therefrom;
positioning an observation station located second receiver toward said satellite and receiving position determinative satellite radio frequency signals therefrom;
determining a time difference between satellite radio frequency signals arriving at said second receiver directional antenna and reflected satellite radio frequency signals arriving at said first receiver;
measuring angular position α
between said satellite and said target relative to said observation station using data obtained from said pointing, positioning and determining steps; and
calculating the distance from said target to said observation station using triangulation mathematics and data obtained from said pointing, positioning and calculating steps.
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Accused Products
Abstract
A method for determining distance from a target to an observation station using a Global Positioning System satellite as a radiation source and first and second observation station located receivers. The first receiver receives reflected position determinative satellite radio frequency signals and the second receiver receives direct position determinative satellite radio frequency signals. The time difference between satellite radio frequency signals arriving at the first and second receivers is calculated and combined with difference distance data and angular, azimuth and elevational position data and the distance from the target to observation point is determined.
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Citations
6 Claims
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1. A method for determining distance from a target to an observation station using a Global Positioning System satellite as a radiation source, said method comprising the steps of:
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pointing an observation station located first receiver directional antenna toward said target and receiving reflected position determinative satellite radio frequency signals therefrom; positioning an observation station located second receiver toward said satellite and receiving position determinative satellite radio frequency signals therefrom; determining a time difference between satellite radio frequency signals arriving at said second receiver directional antenna and reflected satellite radio frequency signals arriving at said first receiver; measuring angular position α
between said satellite and said target relative to said observation station using data obtained from said pointing, positioning and determining steps; andcalculating the distance from said target to said observation station using triangulation mathematics and data obtained from said pointing, positioning and calculating steps. - View Dependent Claims (2, 3)
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4. A method for determining distance from a target to an observation station using a plurality of Global Positioning System satellites as radiation sources, said method comprising the steps of:
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pointing an observation station located first receiver directional antenna toward said target and receiving reflected position determinative satellite radio frequency signals therefrom; positioning an observation station located second receiver toward said satellites and receiving position determinative satellite radio frequency signals therefrom; calculating a time difference between satellite radio frequency signals arriving at said second receiver directional antenna and reflected satellite radio frequency signals arriving at said first receiver; measuring angular position α
between said satellites and said target relative to said observation station using data obtained from said pointing, positioning and calculating steps; andcalculating with least square mathematics the distance from said target to said observation station using triangulation mathematics and data obtained from said pointing, positioning and calculating steps. - View Dependent Claims (5, 6)
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Specification