Honeywell International Inc.

Honeywell G.m.b.h.

Douglas Mark Weed

Randy J Reuter

Ralph R Jones

Rajeev Mohan

Ryan Supino

James Arthur McDonald

John R Morrison

David Robert Storch

Vijay Kumar Shrimal

Charles L Keyes

Mark Hickey

Mohan Singh Tomar

Techniques are disclosed for providing at least one proposed alternative plan of travel of a vehicle are disclosed based upon data of at least one geographic region about at least one of global navigation satellite system (GNSS) spoofing and GNSS jamming. If a current path of travel of the vehicle intersects at least one geographic region of at least one of GNSS spoofing and GNSS jamming, then determining the at least one proposed alternative plan of travel of the vehicle. At least one of the at least one proposed alternative plan of travel includes a path of travel that does not intersect at least one geographic region of the at least one geographic region of at least one of GNSS spoofing and GNSS jamming. The determined at least one proposed alternative plan of travel is sent to the vehicle.

Systems and methods to provide real-time context-based avoidance mechanisms for GNSS jamming or spoofing regions

Systems and methods for monitoring excessive delay gradients using long reference receiver separation distances are provided. In one embodiment, a ground-based system comprising a plurality of reference receivers configured to receive satellite signals. The ground-based system further comprises a processor coupled to a memory. The processor is configured to determine whether the line of sight of a newly available satellite is within a gradient. The processor is further configured to determine a monitor measurement using accumulated carrier data for each pair of reference receivers of a plurality of reference receiver pairs. The processor is further configured to combine monitor measurements for a subset of the plurality of reference receiver pairs into a monitor discriminator. The processor is further configured to output an alert when the monitor discriminator exceeds a threshold.

Ground-based system and method to monitor for excessive delay gradients using long reference receiver separation distances

A ground-based system to reduce the effect of interference, comprising a plurality of reference receivers, wherein the reference receivers are spaced a distance apart such that a single source of interference is unable to substantially interfere with a subset of the plurality of reference receivers, wherein the subset of the plurality of reference receivers includes at least two reference receivers; and a processing module communicatively coupled to the plurality of reference receivers and configured to receive data from each of the plurality of reference receivers, wherein the processing module is further configured to perform differential calculations on the data to calculate measurement corrections and estimated errors.

Systems and methods for maintaining minimum operational requirements of a ground-based augmentation system

An avionics system comprises one or more attitude sources, each configured to produce a respective calculated attitude solution; at least one magnetometer configured to measure magnetic field; and at least one attitude monitor configured to use the respective calculated attitude solution from one of the attitude sources to project the measured magnetic field estimate or an Earth Magnetic Field Model (EMFM) estimate such that the measured magnetic field estimate and the EMFM estimate are in a common shared frame. The at least one attitude monitor is further configured to determine a difference between the measured magnetic field estimate and the EMFM estimate in the common shared frame. The at least one attitude monitor is further configured to output an alert, which indicates that the respective calculated attitude solution used to project the measured magnetic field estimate or the EMFM estimate is in error, if the difference exceeds a predetermined threshold.

Method of detecting attitude faults based on magnetometer measurements

A processing module to monitor a horizontal delay gradient in satellite signals is provided. The processing module includes a dual-processing-satellite-differencing module, a double differencing module, and a gradient estimator module. The dual-processing-satellite-differencing module is operable to: receive carrier phase measurements for at least two satellites from at least two reference receivers; implement a first processing mode to normalize first satellite differences between +&#x3bb;/2 and &#x2212;&#x3bb;/2; implement a second processing mode configured to normalize second satellite differences between 0 and &#x3bb;; and select for further processing one of: data indicative of the first satellite differences processed according to the first processing mode; and data indicative of the second satellite differences processed according to the second processing mode. The double differencing module forms double-differences based on the selected data input from the dual-processing-satellite-differencing module. The gradient estimator module estimates a magnitude of the horizontal delay gradient.

Ground-based system and method to extend the detection of excessive delay gradients using dual processing

Systems and methods to monitor for false alarms from ionosphere gradient monitors are provided. In one embodiment, a method for mitigating false gradient alarms in a satellite navigation Ground Based Augmentation System (GBAS) ground station comprising a plurality of satellite navigation system reference receivers comprises: generating an alarm signal with an ionosphere gradient monitor (IGM) at the GBAS ground station; determining whether the alarm signal is a false alarm based on data derived from carrier phase measurements received from the plurality of satellite navigation system reference receivers; and blocking the alarm signal for at least a first duration of time based on the determining.

Systems and methods to monitor for false alarms from ionosphere gradient monitors

A processing function to monitor a horizontal delay gradient in satellite signals is provided. The processing function includes a satellite differencing module, a double differencing module, a parity test module, and a gradient estimator module. The satellite differencing module receives carrier phase measurements for at least two satellites from at least three reference receivers. The satellite differencing module determines differences in the carrier phase measurements between signals from the monitored satellite and at least one of the at least one other satellite. The double differencing module: forms double-differences between pairs of the reference receivers; compensates the double-differences between the pairs; performs a modulo operation; and averages the double differences. The parity test module inputs the averaged compensated double differences when the average exceeds a parity enable threshold. The gradient estimator module configured is to estimate a magnitude of the horizontal delay gradient.

Ground-based system and method to extend the detection of excessive delay gradients using parity corrections

A calibration method comprises providing a mounting fixture including a tray coupled to a frame, and an alignment measurement sensor removably coupled to the tray. An angular orientation of the tray is determined using the alignment measurement sensor removably coupled to the tray in a first position. The alignment measurement sensor is then moved to a second position on the tray that is rotated from the first position, and the angular orientation of the tray is determined using the alignment measurement sensor at the second position. An axis misalignment for at least two of a pitch axis, a roll axis, or a yaw axis of the alignment measurement sensor is then calculated to determine one or more misalignment factors. The one or more misalignment factors are then applied to correct for misalignment of the alignment measurement sensor.

Field interchangable boresight mounting system and calibration method

A method for installation alignment of an inertial reference unit (IRU) with vehicle axes when the IRU is installed within the vehicle is provided. The vehicle axes include roll, pitch, and yaw axes. The method includes recording vehicle angular position data including roll and pitch, using an angular position measurement device with the vehicle being in a starting position, recording IRU data including roll and pitch, receiving measured nose plunge data, computing initial roll and pitch misalignment corrections, applying initial roll and pitch misalignment corrections to measured nose plunge data. A nose plunge yaw misalignment is determined using corrected nose plunge data and utilized to adjust the assumed heading reference.

Methods and apparatus for installation alignment of equipment

A system for calibrating the sensors of a redundant sensor system by calculating a first set of error signals based on differences between a combination of the outputs and known values and calculating a second set of error signals based on differences between the parity among preselected sensors and a predetermined value and calculating, from the first and second set of error signals, a plurality of calibration signals to be added to the output of the individual sensors which are in error so as to correct their outputs.

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Forest Lake, MN, United States of America

Douglas Mark Weed