Ground location inertial navigation geopositioning system (groundlings)
First Claim
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1. A ground location inertial navigation geopositioning system (GROUNDLINGS) end receiver (GER), comprising:
- a GROUNDLINGS module configured to generate a GER position using a time of flight (TOP) of a downlink pseudo-random noise (PRN) signal and a Doppler shift of at least one of the downlink PRN signal and a downlink tone signal on a common frequency carrier, wherein the downlink PRN signal sent from a GROUNDLINGS satellite (GRS) to the GER comprises a copy of an uplink PRN signal from a ground located transceiver (GLT) to the GRS, and the downlink tone signal is received from the GRS,wherein the GROUNDLINGS module further comprises;
a Doppler shift module configured to measure a Doppler shift in at least one of the downlink PRN signal and the downlink tone signal;
a range estimator configured to calculate a GLT range from the GLT to the GRS using GRS ephemeris information and a GLT location included in the downlink PRN signal and calculate a super-range measurement from a timing of the downlink PRN signal, wherein the super-range measurement represents a distance from the GLT to the GER via the GRS; and
a receiver location estimator configured to estimate a GER position using the ephemeris of the GRS, the GLT range, the super-range measurement, and the measured the Doppler shift in at least one of the downlink PRN signal and the downlink tone signal.
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Abstract
A ground location inertial navigation geopositioning system (GROUNDLINGS) end receiver (GER) can include a GROUNDLINGS module. The GROUNDLINGS module can be configured to generate a GER position using a time of flight (TOF) of a downlink pseudo-random noise (PRN) signal and a Doppler shift of at least one of the downlink PRN signal and a downlink tone signal on a common frequency carrier. The downlink PRN signal sent from a GROUNDLINGS satellite (GRS) to the GER can include a copy of an uplink PRN signal from a ground located transceiver (GLT) to the GRS. When used, the downlink tone signal can be received from the GRS.
21 Citations
20 Claims
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1. A ground location inertial navigation geopositioning system (GROUNDLINGS) end receiver (GER), comprising:
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a GROUNDLINGS module configured to generate a GER position using a time of flight (TOP) of a downlink pseudo-random noise (PRN) signal and a Doppler shift of at least one of the downlink PRN signal and a downlink tone signal on a common frequency carrier, wherein the downlink PRN signal sent from a GROUNDLINGS satellite (GRS) to the GER comprises a copy of an uplink PRN signal from a ground located transceiver (GLT) to the GRS, and the downlink tone signal is received from the GRS, wherein the GROUNDLINGS module further comprises; a Doppler shift module configured to measure a Doppler shift in at least one of the downlink PRN signal and the downlink tone signal; a range estimator configured to calculate a GLT range from the GLT to the GRS using GRS ephemeris information and a GLT location included in the downlink PRN signal and calculate a super-range measurement from a timing of the downlink PRN signal, wherein the super-range measurement represents a distance from the GLT to the GER via the GRS; and a receiver location estimator configured to estimate a GER position using the ephemeris of the GRS, the GLT range, the super-range measurement, and the measured the Doppler shift in at least one of the downlink PRN signal and the downlink tone signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for positioning using a ground location inertial navigation geopositioning system (GROUNDLINGS) end receiver (GER), comprising:
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generating a position using a time of flight (TOP) of a downlink pseudo-random noise (PRN) signal and a Doppler shift of at least one of the downlink PRN signal and a downlink tone signal on a common frequency carrier, wherein the downlink PRN signal sent from a GROUNDLINGS satellite (GRS) to the GER comprises a copy of an uplink PRN signal from a ground located transceiver (GLT) to the GRS, and the downlink tone signal is received from the GRS, wherein generating the GER position further comprises; extracting GRS ephemeris information and a GLT location from the downlink PRN signal; determining a GLT range from the GLT to the GRS using the ephemeris of the GRS and the location of the GLT; caculating a super-range measurement from a timing of the downlink PRN signal, wherein the super-range measurement represents a distance from the GLT to the GER via the GRS; measuring a Doppler shift of at least one of the downlink PRN signal and a downlink tone signal; and estimating a GER position using the ephemeris of the GRS, the GLT range, the super-range measurement, and the measured the Doppler shift in at least one of the downlink PRN signal and the downlink tone signal. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A ground location inertial navigation geopositioning system (GROUNDLINGS) end receiver (GER), comprising:
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a GROUNDLINGS module configured to generate a global position using a time of flight (TOF) of a broadcast signal from a known transmitter (KT) and a TOF and a Doppler shift of a copy of the broadcast signal relayed through a GROUNDLINGS satellite (GRS), wherein the GROUNDLINGS module further comprises; a Doppler shift module configured to measure a Doppler shift in the copy of the broadcast signal; a range estimator configured to calculate a KT range from the KT to GRS using an ephemeris of the GRS and a location of the KT and calculate a super-range measurement from a timing of the copy of the broadcast signal, wherein the super-range measurement represents a distance from the KT to the GER via the GRS; and a receiver location estimator configured to estimate a GER position using the ephemeris of the GRS, the KT range, the super-range measurement, a TOF the broadcast signal, and the measured the Doppler shift in the copy of the broadcast signal. - View Dependent Claims (19, 20)
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Specification