Electronic tape measure on a cellphone
First Claim
1. A method of implementing an electronic tape measure, said method comprising:
- receiving at a first location a first plurality of L1 Global Positioning System (GPS) signals from a plurality of GPS satellites during an epoch and digitizing said first plurality of L1 GPS signals;
receiving at said first location a second plurality of L2C GPS signals from said plurality of GPS satellites during said epoch and digitizing said second plurality of L2C GPS signals;
using a software defined GPS receiver operating on a processor of a cellular telephone to derive pseudorange and carrier phase measurements from said first plurality of L1 GPS signals and pseudorange and carrier phase measurements from said second plurality of L2C GPS signals;
receiving a wireless message from a communication device located at a base location conveying pseudorange and carrier phase measurements derived from said first plurality of L1 GPS signals from said plurality of GPS satellites during said epoch; and
determining by said cellular telephone a distance from said base location to said first location.
2 Assignments
0 Petitions
Accused Products
Abstract
A radio frequency component receives and digitizes a first plurality of L1 Global Navigation Satellite System (GNSS) signals and a second plurality of L2C GNSS signals from a plurality of GNSS satellites. A software defined GNSS receiver operating on a processor of a cellular telephone separate from the radio frequency component derives carrier phase measurements from the first plurality of L1 GNSS signals and the second plurality of L2C GNSS signals during an epoch. A wireless message from a communication device located at a base location is received conveying pseudorange and carrier measurements derived from the first plurality of L1 GNSS signals from said plurality of GNSS satellites during the epoch. The cellular telephone determines a distance from the base location to said first location.
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Citations
20 Claims
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1. A method of implementing an electronic tape measure, said method comprising:
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receiving at a first location a first plurality of L1 Global Positioning System (GPS) signals from a plurality of GPS satellites during an epoch and digitizing said first plurality of L1 GPS signals; receiving at said first location a second plurality of L2C GPS signals from said plurality of GPS satellites during said epoch and digitizing said second plurality of L2C GPS signals; using a software defined GPS receiver operating on a processor of a cellular telephone to derive pseudorange and carrier phase measurements from said first plurality of L1 GPS signals and pseudorange and carrier phase measurements from said second plurality of L2C GPS signals; receiving a wireless message from a communication device located at a base location conveying pseudorange and carrier phase measurements derived from said first plurality of L1 GPS signals from said plurality of GPS satellites during said epoch; and determining by said cellular telephone a distance from said base location to said first location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electronic tape measure system comprising:
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a first electronic tape measure (ETM) unit at a first location, comprising; a first radio frequency hardware component comprising; a first digitizer configured for digitizing a first plurality of L1 Global Positioning System GPS signals received from a plurality of GPS satellites during an epoch into a first plurality of respective digitized L1 GPS signals and for digitizing a second plurality of L2C GPS signals received from said plurality of GPS satellites during said epoch into a second plurality of respective digitized L2C GPS signals; and a communication device configured to receive said first plurality of respective digitized L1 GPS signals and said second plurality of respective digitized L2C GPS signals, said communication device comprising; a wireless communication transceiver configured to receive a wireless message from a second ETM unit at a second location conveying pseudorange and carrier phase measurements derived from said first plurality of L1 GPS signals from said plurality of GPS satellites in said epoch; a processor configured for operating a software defined GPS receiver to determine a distance estimate from said first location to said second location; and
said second ETM unit at said second location comprising;a second radio frequency hardware component comprising; a second digitizer configured for digitizing said first plurality of L1 GPS signals received from said plurality of GPS satellites during said epoch into a third plurality of respective digitized L1 GPS signals and for digitizing said second plurality of L2C GPS signals received from said plurality of GPS satellites during said epoch into a fourth plurality of respective digitized L2C GPS signals; and a second communication device configured to receive said third plurality of respective digitized L1 GPS signals and said fourth plurality of respective digitized L2C GPS signals, said second communication device comprising; a second wireless communication transceiver configured to send a wireless message to said first ETM unit, said wireless message conveying pseudorange and carrier phase measurements derived from said third plurality of respective digitized L1 GPS signals; and a second processor configured for operating a second software defined GPS receiver to determine said geographical position of said second GPS antenna. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of implementing an electronic tape measure, said method comprising:
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receiving at a first location a first plurality of Global Navigation Satellite System (GNSS) signals from a plurality of GNSS satellites at a first frequency during an epoch and digitizing said first plurality of GNSS signals; receiving at said first location a second plurality of GNSS signals from said plurality of GNSS satellites at a second frequency different from said first frequency during said epoch and digitizing said second plurality of GNSS signals; using a software defined GNSS receiver operating on a processor of a cellular telephone to derive pseudorange and carrier phase measurements from said first plurality of GNSS signals and pseudorange and carrier phase measurements from said second plurality of GNSS signals; receiving a wireless message from a communication device located at a base location conveying pseudorange and carrier phase measurements derived from said first plurality of GNSS signals from said plurality of GNSS satellites during said epoch; and determining by said cellular telephone a distance from said base location to said first location.
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Specification