SYSTEMS AND METHODS FOR MONITORING BROADBAND RADIO FREQUENCY INTERFERENCE

Systems and methods for monitoring broadband radio frequency interference are provided. In certain embodiments, a method comprises calculating a smoothed carrier to noise value for a received signal on a processing unit, wherein the received signal is associated with a receiver and at least one satellite; calculating an average jammer power to noise power value for the receiver; calculating an instantaneous carrier to noise value for the received signal based on the average jammer power to noise power value and the smoothed carrier to noise value; comparing the instantaneous carrier to noise value to an exclusion threshold, and determining whether to exclude the received signal from calculations of global positioning data based on the comparison of the instantaneous carrier to noise value to the exclusion threshold; and when the received signal is excluded, monitoring the received signal for readmittance to the calculation of global positioning data. 1. A system for monitoring broadband radio frequency interference , the system comprising:at least one global navigation satellite system receiver configured to receive signals from at least one satellite and provide measurements from the at least one satellite, wherein the measurements are used to calculate global positioning data;at least one memory unit configured to store instructions and data; and measure a carrier to noise value for the at least one satellite through the at least one global navigation satellite system receiver;', 'calculate a smoothed carrier to noise value, wherein the smoothed carrier to noise value is calculated based on measurements from the at least one global navigation satellite system receiver during a first time period;', 'calculate a jammer power to noise power value;', 'calculate an average jammer power to noise power value, based on the jammer power to noise power value;', 'calculate an instantaneous carrier to noise value based on the average jammer power to noise power value and the ...

USING SBAS IONOSPHERIC DELAY MEASUREMENTS TO MITIGATE IONOSPHERIC ERROR

Systems and methods for using SBAS delay measurements to mitigate ionospheric error are provided. In an embodiment, an array of ionospheric delay measurements of a GNSS is provided, wherein a pierce point is associated with each delay measurement in the array. Further, at least one first element in the array and at least one second element in the array that has a different pierce point than the at least one first element are selected and it's determined whether the difference between the delay measurement of the at least one first element and the delay measurement of the at least one second element is less than a threshold. A level of inflation of error due to geometric screening techniques is adjusted if the difference between the delay measurement of the at least one first element and the delay measurement of the at least one second element is less than the threshold. 1. A method comprising:providing an array of ionospheric delay measurements of a global navigation satellite system, wherein a pierce point is associated with each ionospheric delay measurement in the array;selecting at least one first element in the array;selecting at least one second element in the array that has a different pierce point than the at least one first element;determining whether the difference between the ionospheric delay measurement of the at least one first element and the ionospheric delay measurement of the at least one second element is less than a threshold; andadjusting a level of inflation of error due to geometric screening techniques if the difference between the ionospheric delay measurement of the at least one first element and the ionospheric delay measurement of the at least one second element is less than the threshold.2. The method of claim 1 , wherein selecting the at least one first element in the array comprises selecting the at least one first element that has the pierce point closest to a chosen GBAS Ground Subsystem.3. The method of claim 2 , wherein selecting ...

USING SPACE-BASED AUGMENTATION SYSTEM (SBAS) GRID IONOSPHERE VERTICAL ERROR (GIVE) INFORMATION TO MITIGATE IONOSPHERE ERRORS FOR GROUND BASED AUGMENTATION SYSTEMS (GBAS)

GBAS includes reference receivers, processing module, and communication device. Processing module checks GNSS satellite measurements to determine proximity of GNSS satellite measurement's IPP to IGPs derived from SBAS geostationary satellites. Processing module determines that GNSS satellite measurement is safe for mitigation using overbounded Vertical Ionosphere Gradient standard deviation sigma-vig (σ) when IGPs possess acceptable GIVE values. Processing module determines whether number of GNSS satellite measurements determined safe for mitigation using σare able to produce VPL that meets VAL required for precision approach. Communication device communicates overbounded σalong with differential corrections and indication of which GNSS satellite measurements that are safe for mitigation using at least one overbounded σare able to produce VPL that meets VAL required for precision approach to GNSS receiver when number of GNSS satellite measurements determined safe for mitigation using overbounded σare able to produce VPL that meets VAL required for precision approach. 1. A Ground Based Augmentation System (GBAS) comprising:a plurality of reference receivers having known positions;at least one processing module communicatively coupled to the plurality of reference receivers;at least one aircraft communication device communicatively coupled to the at least one processing module;wherein the at least one processing module is configured to check a Global Navigation Satellite System (GNSS) satellite measurement for each of a plurality of Global Navigation Satellite System (GNSS) satellites to determine the proximity of each Global Navigation Satellite System (GNSS) satellite measurement's Ionosphere Pierce Point (IPP) to a plurality of Ionosphere Grid Points (IGPs) derived from at least one Space-Based Augmentation System (SBAS) geostationary satellite;{'sub': 'vig', 'wherein the at least one processing module is further configured to determine that the Global Navigation ...

USING SPACE BASED AUGMENTATION SYSTEM (SBAS) EPHEMERIS SIGMA INFORMATION TO REDUCE GROUND BASED AUGMENTATION SYSTEMS (GBAS) EPHEMERIS DECORRELATION PARAMETER

A method of using space based augmentation system (SBAS) ephemeris data in conjunction with a ground based augmentation systems (GBAS) station is provided. The method includes integrating a space based augmentation system (SBAS) receiver in the GBAS station; receiving an industry-standard message type via the SBAS receiver at the GBAS station; consuming, at the GBAS station, the SBAS ephemeris data from the industry-standard message type associated with satellites in view of the GBAS station. The industry-standard message type includes SBAS ephemeris data associated with satellites in a global navigation satellite system (GNSS). The method further includes, based on the consuming, improving error bounds to GBAS broadcast ephemeris decorellation parameters broadcast from the GBAS station and reducing time to reintroduce a satellite in the GNSS. 1. A method of using space based augmentation system (SBAS) ephemeris data in conjunction with a ground based augmentation systems (GBAS) station , the method comprising:integrating a space based augmentation system (SBAS) receiver in the GBAS station;receiving an industry-standard message type via the SBAS receiver at the GBAS station, the industry-standard message type including SBAS ephemeris data associated with satellites in a global navigation satellite system (GNSS); improving error bounds to GBAS broadcast ephemeris decorellation parameters broadcast from the GBAS station; and', 'reducing time to reintroduce a satellite in the GNSS., 'consuming, at the GBAS station, the SBAS ephemeris data from the industry-standard message type associated with satellites in view of the GBAS station and based on the consuming2. The method of claim 1 , wherein improving the error bounds to the GBAS broadcast ephemeris decorellation parameters broadcast from the GBAS station comprises decreasing a P-value broadcast from the GBAS station.3. The method of claim 1 , wherein improving the error bounds to the GBAS broadcast ephemeris ...

Use of wide area reference receiver network data to mitigate local area error sources

A system to mitigate errors in GPS corrections and ephemeris uncertainty data broadcast to a vehicle is presented. The system includes reference receivers in a first ground subsystem and a processor. The processor: receives, from reference receivers in a wide area network of reference receivers, satellite measurement data for a first plurality of satellites and receives, from the reference receivers in the first ground subsystem, satellite measurement data and ephemeris data from a second plurality of satellites; evaluate the satellite measurement data to determine if the GPS corrections are degraded by a current ionosphere disturbance activity; determine a current quality metric of the ionosphere; adjust a Vertical Ionosphere Gradient standard deviation sigma-vig; evaluate the ephemeris data to determine if the GPS corrections provided to the vehicle are degraded by ephemeris errors; and establish ephemeris uncertainty to protect integrity based on the evaluation of the ephemeris data.

SATELLITE MEASUREMENT SCREENING TO PROTECT THE INTEGRITY OF EXISTING MONITORS IN THE PRESENCE OF PHASE SCINTILLATION

A method of implementing a real-time screening process for phase scintillation is presented. The method includes detecting a phase scintillation event during a sample time period at a phase scintillation monitor; excluding associated satellite measurement data from further use based on the detection of the phase scintillation event at the phase scintillation monitor; detecting an end to the phase scintillation event at the phase scintillation monitor; and readmitting associated satellite measurement data collected after the end of the phase scintillation event as detected by the phase scintillation monitor. 1. A method of implementing a real-time screening process for phase scintillation , the method comprising:detecting a phase scintillation event during a sample time period at a phase scintillation monitor;excluding associated satellite measurement data from further use based on the detection of the phase scintillation event at the phase scintillation monitor;detecting an end to the phase scintillation event at the phase scintillation monitor; andreadmitting associated satellite measurement data collected after the end of the phase scintillation event as detected by the phase scintillation monitor.2. The method of claim 1 , further comprising:calculating satellite (SV) motion and SV clock corrected carrier rates for reference receiver/satellite pairs for which accumulated delta range data is available;compensating a SV motion and a SV clock corrected carrier rate for a reference receiver clock by subtracting an average of all the other SV motion and SV clock corrected carrier rates from the SV motion and SV clock corrected carrier rates; andcalculating a reference receiver de-trended SV motion and SV clock corrected carrier rate for the reference receiver/satellite pairs in a sample time period.3. The method of claim 2 , further comprising:computing a carrier phase estimate using numerical integration;calculating a sample average of the carrier phase estimate for ...

SATELLITE MEASUREMENT SCREENING TO PROTECT THE INTEGRITY OF EXISTING MONITORS IN THE PRESENCE OF AMPLITUDE SCINTILLATION

A method of implementing a real-time screening process for amplitude scintillation is presented. The method includes detecting an amplitude scintillation event during a sample time period at an amplitude scintillation monitor; excluding associated satellite measurement data from further use based on the detection of the amplitude scintillation event at the amplitude scintillation monitor; detecting an end to the amplitude scintillation event at the amplitude scintillation monitor; and readmitting associated satellite measurement data collected after the end of the amplitude scintillation event as determined by the amplitude scintillation monitor. 1. A method of implementing a real-time screening process for amplitude scintillation , the method comprising:detecting an amplitude scintillation event during a sample time period at an amplitude scintillation monitor;excluding associated satellite measurement data from further use based on the detection of the amplitude scintillation event at the amplitude scintillation monitor;detecting an end to the amplitude scintillation event at the amplitude scintillation monitor; andreadmitting associated satellite measurement data collected after the end of the amplitude scintillation event as determined by the amplitude scintillation monitor.2. The method of claim 1 , wherein detecting the amplitude scintillation event during the sample measurement at the amplitude scintillation monitor comprises:determining an amplitude scintillation monitor discriminator in a current sample time period for at least one reference receiver/satellite pair meets exclusion criteria.3. The method of claim 2 , wherein determining the amplitude scintillation monitor discriminator in the current sample time period for at least one reference receiver/satellite pair meets the exclusion criteria comprises:determining the amplitude scintillation monitor discriminator in the current sample time period for the at least one reference receiver/satellite pair is ...

SYSTEMS AND METHODS FOR A CODE CARRIER DIVERGENCE HIGH-PASS FILTER MONITOR

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, dproduced by the CCD monitor stage through a high-pass filter to calculate an averaged CCD-HPF monitor divergence rate, d; wherein the signal deformation monitor outputs an exclusion signal associated with a GNSS satellite when the averaged CCD-HPF monitor divergence rate, dexceeds an exclusion threshold. 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 Code Carrier Divergence (CCD) monitor stage; and', 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;', {'sub': '2', 'wherein the CCD monitor stage outputs for each of the plurality of GNSS reference receivers respective low-pass filtered divergence rate measurements, d, for the GNSS satellite;'}, {'sub': 3', '2, 'wherein the CCD-HPF monitor stage calculates for each of the plurality of GNSS reference receivers respective CCD-HPF divergence rate estimates, d, by applying a high pass filter algorithm to the ...

Systems and methods for a code carrier divergence high-pass filter monitor

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, d2produced 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_Averageexceeds an exclusion threshold.

Predictive approach integrity

A method and apparatus are provided for predicting the position error bound in a satellite positioning system at a future time. The future position of each satellite at the future time is calculated from the trajectory data obtained from each satellite. The predicted position for each satellite and the estimated position of the satellite positioning system receiver is then used to generate a line of sight matrix at the future time from which a position error bound is determined.

Differential GPS landing assistance system

An aircraft landing system is disclosed in which a differential GPS global positioning system is employed. A ground station, located in the vicinity of one or more landing strips, includes a GPS receiver and a data link transmitter for transmitting GPS correction data and also the global position of two points which define a desired aircraft glide path associated with a particular landing strip. The system further includes aircraft equipment comprising a receiver for receiving the correction data and the global position of the two glide path points, and a GPS receiver. The aircraft equipment further includes a computer for determining a corrected global position of the aircraft as a function of the aircraft GPS range data and the correction data, and subsequently determines the lateral deviation and vertical deviation from the glide path defined by the two glide path points.

Differential gps landing assistance system

An aircraft landings system is disclosed in which a differential GPS global positioning system is employed. A ground station, located in the vicinity of one or more landing strips, includes a GPS receiver and a data link transmitter for transmitting GPS correction data and also the global position of two points which define the desired aircraft glide path associated with a particular landing strip. The system fur-ther includes aircraft equipment comprising a receiver for receiving the correction data and the global position of the two glide path points, and a GPS receiver. The aircraft equipment further includes a computer for determining a corrected global position of the aircraft as a function of the aircraft GPS range data and the correction data, and subsequently determines the lateral deviation and vertical deviation from the glide path defined by the two glide path points.

Systems for a code carrier divergence high-pass filter monitor

Satellite measurement screening to protect the integrity of existing monitors in the presence of amplitude scintillation

Use of wide area reference receiver network data to mitigate local area error sources

A system to mitigate errors in GPS corrections and ephemeris uncertainty data broadcast to a vehicle is presented. The system includes reference receivers in a first ground subsystem and a processor. The processor: receives, from reference receivers in a wide area network of reference receivers, satellite measurement data for a first plurality of satellites and receives, from the reference receivers in the first ground subsystem, satellite measurement data and ephemeris data from a second plurality of satellites; evaluate the satellite measurement data to determine if the GPS corrections are degraded by a current ionosphere disturbance activity; determine a current quality metric of the ionosphere; adjust a Vertical Ionosphere Gradient standard deviation sigma-vig; evaluate the ephemeris data to determine if the GPS corrections provided to the vehicle are degraded by ephemeris errors; and establish ephemeris uncertainty to protect integrity based on the evaluation of the ephemeris data.

Satellite measurement screening to protect the integrity of existing monitors in the presence of phase scintillation

A method of implementing a real-time screening process for phase scintillation is presented. The method includes detecting a phase scintillation event during a sample time period at a phase scintillation monitor; excluding associated satellite measurement data from further use based on the detection of the phase scintillation event at the phase scintillation monitor; detecting an end to the phase scintillation event at the phase scintillation monitor; and readmitting associated satellite measurement data collected after the end of the phase scintillation event as detected by the phase scintillation monitor.

Using space-based augmentation system (SBAS) grid ionosphere vertical error (GIVE) information to mitigate ionosphere errors for ground based augmentation systems (GBAS)

GBAS includes reference receivers, processing module, and communication device. Processing module checks GNSS satellite measurements to determine proximity of GNSS satellite measurement's IPP to IGPs derived from SBAS geostationary satellites. Processing module determines that GNSS satellite measurement is safe for mitigation using overbounded Vertical Ionosphere Gradient standard deviation sigma-vig (σ vig ) when IGPs possess acceptable GIVE values. Processing module determines whether number of GNSS satellite measurements determined safe for mitigation using σ vig are able to produce VPL that meets VAL required for precision approach. Communication device communicates overbounded σ vig along with differential corrections and indication of which GNSS satellite measurements that are safe for mitigation using at least one overbounded σ vig are able to produce VPL that meets VAL required for precision approach to GNSS receiver when number of GNSS satellite measurements determined safe for mitigation using overbounded σ vig are able to produce VPL that meets VAL required for precision approach.

Satellite measurement screening to protect the integrity of existing monitors in the presence of amplitude scintillation

A method of implementing a real-time screening process for amplitude scintillation is presented. The method includes detecting an amplitude scintillation event during a sample time period at an amplitude scintillation monitor; excluding associated satellite measurement data from further use based on the detection of the amplitude scintillation event at the amplitude scintillation monitor; detecting an end to the amplitude scintillation event at the amplitude scintillation monitor; and readmitting associated satellite measurement data collected after the end of the amplitude scintillation event as determined by the amplitude scintillation monitor.