System and method for compact storage and transmission of position and residual information usable in differential global positioning
First Claim
1. A method for producing a compressed differential global positioning data set at a mobile GPS receiving location, comprising:
- receiving GPS signals from at least five GPS signal transmitting satellites at a mobile GPS receiving location, said GPS signals being effective for producing a line-of-sight for each of said at least five GPS signal transmitting satellites;
generating pseudorange values for each of said at least five GPS signal transmitting satellites from corresponding ones of said GPS signals;
producing pseudorange error values corresponding to said pseudorange values, based upon an initial estimated position of said mobile GPS receiving location;
developing position error indications by a least squares operation for each pseudorange error value;
producing a residual value for each of said at least five GPS signal transmitting satellites, based upon corresponding ones of said pseudorange errors, position error indications, and lines-of-sight;
producing a position indication for each position error indication produced, based upon a comparison of said position error indications with said initial estimated position; and
transmitting said position indications produced and one of the residual values produced to a second GPS receiving location.
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Accused Products
Abstract
A system and method for optimizing data transmission and storage of minimal sets of position, time, and residual information required for differential global positioning involving at least two GPS receiving stations, one of which may be stationary and at least one of which is mobile, with increased accuracy and compactness. The method includes sending or storing minimal and enhanced combinations of information. If the indicated values are stored rather than immediately transmitted, they may be retrieved for subsequent combination with values established at another station which may be stationary or mobile. The invention relates particularly to the enablement and performance of compacted storage and transmission of position-oriented and residual information for GPS systems and methods.
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Citations
18 Claims
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1. A method for producing a compressed differential global positioning data set at a mobile GPS receiving location, comprising:
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receiving GPS signals from at least five GPS signal transmitting satellites at a mobile GPS receiving location, said GPS signals being effective for producing a line-of-sight for each of said at least five GPS signal transmitting satellites; generating pseudorange values for each of said at least five GPS signal transmitting satellites from corresponding ones of said GPS signals; producing pseudorange error values corresponding to said pseudorange values, based upon an initial estimated position of said mobile GPS receiving location; developing position error indications by a least squares operation for each pseudorange error value; producing a residual value for each of said at least five GPS signal transmitting satellites, based upon corresponding ones of said pseudorange errors, position error indications, and lines-of-sight; producing a position indication for each position error indication produced, based upon a comparison of said position error indications with said initial estimated position; and transmitting said position indications produced and one of the residual values produced to a second GPS receiving location. - View Dependent Claims (6, 7)
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2. A method for producing a compressed differential global positioning data set at a mobile GPS receiving location, comprising:
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receiving GPS signals from at least five GPS signal transmitting satellites at a mobile GPS receiving location, said GPS signals being effective for producing a line-of-sight for each of said at least five GPS signal transmitting satellites; generating pseudorange values for each of said at least five GPS signal transmitting satellites from corresponding ones of said GPS signals; producing pseudorange error values corresponding to said pseudorange values, based upon an initial estimated position of said mobile GPS receiving location; developing position error indications by a least squares operation for each pseudorange error value; producing a residual value for each of said at least five GPS signal transmitting satellites, based upon corresponding ones of said pseudorange errors, position error indications, and lines-of-sight; producing a position indication for each position error indication produced, based upon a comparison of said position error indications with said initial estimated position; and storing said position indications produced and one of the residual values produced at said mobile GPS receiving location.
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3. A method for producing a compressed differential global positioning data set at a mobile GPS receiving location, comprising
receiving GPS signals from at least five GPS signal transmitting satellites at a mobile GPS receiving location, said GPS signals being effective for producing a line-of-sight for each of said at least five GPS signal transmitting satellites; -
generating pseudorange values for each of said at least five GPS signal transmitting satellites from corresponding ones of said GPS signals; producing pseudorange error values corresponding to said pseudorange values, based upon an initial estimated position of said mobile GPS receiving location; developing position error indications by a least squares operation for each pseudorange error value; producing a residual value for each of said at least five GPS signal transmitting satellites, based upon corresponding ones of said pseudorange errors, position error indications, and lines-of-sight; producing a position indication for each position error indications produced, based upon a comparison of said position error indications with said initial estimated position; and making a linear combination of residual values for more compact data transmission and storage. - View Dependent Claims (4, 5)
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8. A position determination system for enabling determination of the position of a mobile GPS receiving station, comprising:
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a mobile GPS receiver for receiving GPS signals from at least five GPS signal transmitting satellites at a mobile GPS receiving location, said mobile GPS receiver being effective for producing a line-of-sight for each of said at least five GPS signal transmitting satellites based upon GPS signals received from said at least five GPS signal transmitting satellites; a pseudorange generator for producing pseudorange values for each of said at least five GPS signal transmitting satellites from corresponding ones of said GPS signals; means for producing pseudorange error values corresponding to said pseudorange values, based upon an initial estimated position of said mobile GPS receiving location; means for developing position error indications by a least squares operation for each pseudorange error value; means for producing a residual value for each of said at least five GPS signal transmitting satellites, based upon corresponding ones of said pseudorange errors, position error indications, and lines-of-sight; means for producing a position indication for each position error indication produced, based upon a comparison of said position error indications with said initial estimated position; and means for transmitting said position indications produced and one of the residual values produced to a second GPS receiving location. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A GPS position determination system for determining the position of a mobile GPS receiving station, comprising:
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a mobile GPS receiver for receiving GPS signals from at least five GPS signal transmitting satellites at a mobile GPS receiving location, said mobile GPS receiver being effective for producing a line-of-sight for each of said at least five GPS signal transmitting satellites based upon GPS signals received from said at least five GPS signal transmitting satellites; a pseudorange generator for producing pseudorange values for each of said at least five GPS signal transmitting satellites from corresponding ones of said GPS signals; means for producing pseudorange error values corresponding to said pseudorange values, based upon an initial estimated position of said mobile GPS receiving location; means for developing position error indications by a least squares operation for each pseudorange error value; means for producing a position indication for each position error indication produced, based upon a comparison of said position error indications with said initial estimated position; means for producing a residual value for each of said at least five GPS signal transmitting satellites, based upon corresponding ones of said pseudorange errors, position error indications, and lines-of-sight; and a transmitter for transmitting position and residual indications to a second GPS receiving location. - View Dependent Claims (16)
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17. A GPS position determination system for determining the position of a mobile GPS receiving station, comprising:
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a mobile GPS receiver for receiving GPS signals from at least five GPS signal transmitting satellites at a mobile GPS receiving location, said mobile GPS receiver being effective for producing a line-of-sight for each of said at least five GPS signal transmitting satellites based upon GPS signals received from said at least five GPS signal transmitting satellites; a pseudorange generator for producing pseudorange values for each of said at least five GPS signal transmitting satellites from corresponding ones of said GPS signals; means for producing pseudorange error values corresponding to said pseudorange values, based upon an initial estimated position of said mobile GPS receiving location; means for developing position error indications by a least squares operation for each pseudorange error value; means for producing a position indication for each position error indication produced, based upon a comparison of said position error indications with said initial estimated position; means for producing a residual value for each of said at least five GPS signal transmitting satellites, based upon corresponding ones of said pseudorange errors, position error indications, and lines-of-sight; and a storage system for storing position and residual indications at a selected memory location. - View Dependent Claims (18)
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Specification