Method and system for a differential global navigation satellite system aircraft landing ground station
First Claim
1. A ground station for providing DGNSS correction signals, the ground station comprising:
- at least two independent GNSS satellite signal receivers each with a separate antenna that receives signals from GNSS satellites;
a first processing apparatus that collects and processes information from the at least two independent GNSS receivers, wherein the first processing apparatus fuses DGNSS correction data derived from the at least two independent GNSS receivers to generate combined DGNSS correction messages and the first processing apparatus is functional with two independent GNSS satellite signal receivers, the first processing apparatus including a means for determining GNSS satellite-specific measurement noise errors which are included in the DGNSS correction data derived from the at least two independent GNSS receivers;
a transmitter that broadcasts the combined DGNSS correction messages and other DGNSS information as a composite DGNSS correction signal to GNSS receiving equipment; and
means for generating differential corrections from the signals received by each of the at least two independent GNSS satellite signal receivers, wherein the means for generating differential corrections comprises;
means for computing an expected PR measurement for a GNSS satellite signal from a particular GNSS satellite at a given time based on the particular GNSS satellite'"'"'s demodulated NAV data, the particular GNSS satellite receiver'"'"'s antenna coordinates, and an estimate of the particular GNSS satellite receiver'"'"'s measurement clock time;
means for computing a PRc by subtracting an actual PR measurement from the expected PR measurement;
means for computing an expected PR measurement for a GNSS satellite signal from a particular GNSS satellite at a given time based on the particular GNSS satellite'"'"'s demodulated NAV data, the particular GNSS satellite'"'"'s receiver'"'"'s antenna coordinates, and an estimate of the particular GNSS satellite receiver'"'"'s measurement clock rate; and
means for computing a PRc by subtracting an actual PR measurement from the expected PR measurement.
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Accused Products
Abstract
A differential GNSS ground station is disclosed which generates and broadcasts highly veracious GNSS satellite differential correction data suitable for use in the landing of aircraft. In this context, "veracious` includes the qualities of both accuracy and integrity wherein the broadcast differential correction data is corrupted by a lower level of errors than is customary for the current state of the art and the broadcast differential correction data includes reliable estimates of the noise errors and bias errors corrupting the differential corrections for each GNSS satellite signal. The ground station comprises at least two independent GNSS satellite signal receivers, a processing apparatus for collecting and processing information from the at least two independent GNSS receivers, and a transmitter for broadcasting the composite DGNSS correction signals over a distance.
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Citations
24 Claims
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1. A ground station for providing DGNSS correction signals, the ground station comprising:
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at least two independent GNSS satellite signal receivers each with a separate antenna that receives signals from GNSS satellites; a first processing apparatus that collects and processes information from the at least two independent GNSS receivers, wherein the first processing apparatus fuses DGNSS correction data derived from the at least two independent GNSS receivers to generate combined DGNSS correction messages and the first processing apparatus is functional with two independent GNSS satellite signal receivers, the first processing apparatus including a means for determining GNSS satellite-specific measurement noise errors which are included in the DGNSS correction data derived from the at least two independent GNSS receivers; a transmitter that broadcasts the combined DGNSS correction messages and other DGNSS information as a composite DGNSS correction signal to GNSS receiving equipment; and means for generating differential corrections from the signals received by each of the at least two independent GNSS satellite signal receivers, wherein the means for generating differential corrections comprises; means for computing an expected PR measurement for a GNSS satellite signal from a particular GNSS satellite at a given time based on the particular GNSS satellite'"'"'s demodulated NAV data, the particular GNSS satellite receiver'"'"'s antenna coordinates, and an estimate of the particular GNSS satellite receiver'"'"'s measurement clock time; means for computing a PRc by subtracting an actual PR measurement from the expected PR measurement; means for computing an expected PR measurement for a GNSS satellite signal from a particular GNSS satellite at a given time based on the particular GNSS satellite'"'"'s demodulated NAV data, the particular GNSS satellite'"'"'s receiver'"'"'s antenna coordinates, and an estimate of the particular GNSS satellite receiver'"'"'s measurement clock rate; and means for computing a PRc by subtracting an actual PR measurement from the expected PR measurement. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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2. A ground station for providing DGNSS correction signals, the ground station comprising:
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at least two independent GNSS satellite signal receivers each with a separate antenna that receive signals from GNSS satellites; a first processing apparatus that collects and processes information from the at least two independent GNSS receivers, wherein the first processing apparatus fuses DGNSS correction data derived from the at least two independent GNSS receivers to generate combined DGNSS correction messages and the first processing apparatus is functional with two independent GNSS satellite signal receivers, the first processing apparatus including a means for determining GNSS satellite-specific measurement noise errors which are included in the DGNSS correction data derived from the at least two independent GNSS receivers; and a transmitter that broadcasts the combined DGNSS correction messages and other DGNSS information as a composite DGNSS correction signal to GNSS receiving equipment, wherein the means for determining GNSS satellite-specific measurement noise errors comprises; means for computing a synthetic measurement, wherein the synthetic measurement occurs at a given time within a time window, the time window being measured by two end-points, and wherein the given time corresponds to a time when an actual intervening measurement occurs; means for comparing the synthetic measurement against the actual intervening measurement at the given time; and means for computing a noise corrupting value based on a sequence of comparisons between the synthetic measurements and the actual intervening measurements.
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17. A method for providing DGNSS correction signals, comnprising:
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receiving signals from GNSS satellites using at least two independent GNSS satellite signal receivers each with a separate antennae; collecting and processing information from the at least two independent GNSS receivers including determining GNSS satellite-specific measurement noise errors, wherein a processing apparatus fuses DGNSS correction data, including the GNSS satellite-specific measurement noise errors, derived from the at least two independent GNSS receivers to generate combined DGNSS correction messages, the processing apparatus being functional with two independent GNSS satellite signal receivers; broadcasting the combined DGNSS correction messages along with other DGNSS information as a composite DGNSS correction signal to GNSS receivino equipment; and determining GNSS satellite-specific measurement noise errors; generating differential corrections from the signals received by each of the at least two independent GNSS satellite sigmal receivers, wherein generating differential corrections comprises the steps of; computing an expected PR measurement for a GNSS satellite signal from a particular GNSS satellite at a given time based on the particular GNSS satellite'"'"'s demodulated NAV data, the particular GNSS satellite receiver'"'"'s antenna coordinates, and an estimate of the particular GNSS satellite receiver'"'"'s measurement clock time; computing a PRc by subtracting an actual PR measurement from the expected PR measurement; computing an expected PR measurement for a GNSS satellite signal from a particular GNSS satellite at a given time based on the particular GNSS satellite'"'"'s demodulated NAV data, the particular GNSS satellite'"'"'s receiver'"'"'s antenna coordinates, and an estimate of the particular GNSS satellite receiver'"'"'s measurement clock rate; and computing a PRc by subtracting an actual PR measurement from the expected PR measurement. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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18. A method for providing DGNSS correction signals, comprising:
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receiving signals from GNSS satellites using at least two independent GNSS satellite signal receivers each with a separate antennae; collecting and processing information from the at least two independent GNSS receivers including determining GNSS satellite-specific measurement noise errors, wherein a processing apparatus fuses DGNSS correction data, including the GNSS satellite-specific measurement noise errors, derived from the at least two independent GNSS receivers to generate combined DGNSS correction messages, the processing agpparatus being functional with two independent GNSS satellite signal receivers; determining GNSS satellite-specific measurement noise errors; and broadcasting the combined DGNSS correction messages along with other DGNSS information as a composite DGNSS correction signal to GNSS receiving equipment, wherein determining GNSS satellite-specific measurement noise errors comprises the steps of; computing a synthetic measurement, wherein the synthetic measurement occurs at a given time within a time window, the time window being measured by two end-points, and wherein the given time corresponds to a time when an actual intervening measurement occurs; comparing the synthetic measurement against the actual intervening measurement at the given time; and computing a noise corrupting value based on a sequence of comparisons between the synthetic measurements and the actual intervening measurements.
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Specification