SYSTEMS AND METHODS FOR A CODE CARRIER DIVERGENCE HIGH-PASS FILTER MONITOR
First Claim
1. A global navigation satellite system (GNSS) ground based augmentation system (GBAS), the system comprising:
- a plurality of global navigation satellite system (GNSS) reference receivers;
a processing unit coupled to a memory unit and the plurality of GNSS reference receivers, the processing unit implementing a signal deformation monitor comprising;
a Code Carrier Divergence (CCD) monitor stage; and
a Code Carrier Divergence -High Pass Filer (CCD-HPF) monitor stage;
wherein the CCD monitor stage inputs raw pseudorange code measurements and accumulated delta range carrier measurements from each of the plurality of GNSS reference receivers, the raw pseudorange code measurements and accumulated delta range carrier measurements associated with a navigation signal transmitted by a GNSS satellite;
wherein the CCD monitor stage outputs for each of the plurality of GNSS reference receivers respective low-pass filtered divergence rate measurements, d2, for the GNSS satellite;
wherein the CCD-HPF monitor stage calculates for each of the plurality of GNSS reference receivers respective CCD-HPF divergence rate estimates, d3, by applying a high pass filter algorithm to the respective low-pass filtered divergence rate measurements, d2; and
wherein the CCD-HPF monitor stage calculates an averaged CCD-HPF monitor divergence rate, d3—
Average from the CCD-HPF divergence rate estimates, d3;
wherein based on comparing the d3—
Average to an exclusion threshold, the signal deformation monitor outputs an exclusion signal causing the GBAS to exclude using measurements from the navigation signal transmitted by the GNSS satellite to calculate pseudorange correction information.
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Abstract
Systems and methods for a code carrier divergence (CCD) high-pass filter monitor are provided. In one embodiment, a signal deformation monitor for a GNSS ground based augmentation station, the monitor comprising: a CCD monitor stage communicatively coupled to a plurality of GNSS reference receivers, wherein the CCD monitor stage inputs raw pseudorange code measurements and accumulated delta range carrier measurements from each of the plurality of GNSS reference receivers; and a Code Carrier Divergence -High Pass Filer (CCD-HPF) monitor stage communicatively coupled to the CCD monitor stage, wherein the CCD-HPF monitor processes each of a plurality of low-pass filtered divergence rate measurements, d2 produced by the CCD monitor stage through a high-pass filter to calculate an averaged CCD-HPF monitor divergence rate, d3
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Citations
20 Claims
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1. A global navigation satellite system (GNSS) ground based augmentation system (GBAS), the system comprising:
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a plurality of global navigation satellite system (GNSS) reference receivers; a processing unit coupled to a memory unit and the plurality of GNSS reference receivers, the processing unit implementing a signal deformation monitor comprising; a Code Carrier Divergence (CCD) monitor stage; and a Code Carrier Divergence -High Pass Filer (CCD-HPF) monitor stage; wherein the CCD monitor stage inputs raw pseudorange code measurements and accumulated delta range carrier measurements from each of the plurality of GNSS reference receivers, the raw pseudorange code measurements and accumulated delta range carrier measurements associated with a navigation signal transmitted by a GNSS satellite; wherein the CCD monitor stage outputs for each of the plurality of GNSS reference receivers respective low-pass filtered divergence rate measurements, d2, for the GNSS satellite; wherein the CCD-HPF monitor stage calculates for each of the plurality of GNSS reference receivers respective CCD-HPF divergence rate estimates, d3, by applying a high pass filter algorithm to the respective low-pass filtered divergence rate measurements, d2; and wherein the CCD-HPF monitor stage calculates an averaged CCD-HPF monitor divergence rate, d3 — Average from the CCD-HPF divergence rate estimates, d3;wherein based on comparing the d3 — Average to an exclusion threshold, the signal deformation monitor outputs an exclusion signal causing the GBAS to exclude using measurements from the navigation signal transmitted by the GNSS satellite to calculate pseudorange correction information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A signal deformation monitor for a Global Navigation Satellite System (GNSS) ground based augmentation station, the monitor comprising:
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a Code Carrier Divergence (CCD) monitor stage communicatively coupled to a plurality of GNSS reference receivers, wherein the CCD monitor stage inputs raw pseudorange code measurements and accumulated delta range carrier measurements from each of the plurality of GNSS reference receivers; and a Code Carrier Divergence -High Pass Filer (CCD-HPF) monitor stage communicatively coupled to the CCD monitor stage, wherein the CCD-HPF monitor processes each of a plurality of low-pass filtered divergence rate measurements, d2 produced by the CCD monitor stage through a high-pass filter to calculate an averaged CCD-HPF monitor divergence rate, d3 — Average;wherein the signal deformation monitor outputs an exclusion signal associated with a GNSS satellite when the averaged CCD-HPF monitor divergence rate, d3 — Average exceeds an exclusion threshold. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification