INDEPENDENT INSTRUMENT LANDING SYSTEM MONITOR
First Claim
1. A method of monitoring received instrument landing system (ILS) signals onboard an aircraft, the method comprising the steps of:
- performing, with a processor, a pre-approach sampling of the received ILS signals to thereby generate pre-approach phase ILS data;
determining, in the processor, a statistical approach course of the aircraft based at least in part on the pre-approach phase ILS data;
determining, in the processor, when the aircraft is below a predetermined activation altitude; and
when the aircraft is below the predetermined activation altitude;
performing, with the processor, approach sampling of the received ILS signals to generate approach phase ILS data;
comparing, in the processor, the approach phase ILS data to the statistical approach course to determine a course deviation; and
selectively generating, with the processor, an alert signal when the course deviation exceeds a predetermined magnitude.
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Accused Products
Abstract
A system and method of monitoring received instrument landing system (ILS) signals onboard an aircraft includes performing a pre-approach sampling of the received ILS signals to thereby generate pre-approach phase ILS data. A statistical approach course of the aircraft is determined based at least in part on the pre-approach phase ILS data. A determination is made as to when the aircraft is below a predetermined activation altitude and, when it is, approach sampling of the received ILS signals is performed to generate approach phase ILS data. The approach phase ILS data is compared to the statistical approach course to determine a course deviation. An alert signal is selectively generated when the course deviation exceeds a predetermined magnitude.
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Citations
19 Claims
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1. A method of monitoring received instrument landing system (ILS) signals onboard an aircraft, the method comprising the steps of:
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performing, with a processor, a pre-approach sampling of the received ILS signals to thereby generate pre-approach phase ILS data; determining, in the processor, a statistical approach course of the aircraft based at least in part on the pre-approach phase ILS data; determining, in the processor, when the aircraft is below a predetermined activation altitude; and when the aircraft is below the predetermined activation altitude; performing, with the processor, approach sampling of the received ILS signals to generate approach phase ILS data; comparing, in the processor, the approach phase ILS data to the statistical approach course to determine a course deviation; and selectively generating, with the processor, an alert signal when the course deviation exceeds a predetermined magnitude. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for independently monitoring received instrument landing system (ILS) signals onboard an aircraft, comprising:
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an ILS receiver adapted to receive and demodulate ILS signals; an altimeter configured to sense aircraft altitude and supply altitude data representative of the sensed aircraft altitude; and a processor in operable communication with the localizer receiver and the altimeter, the processor configured, in response to the altitude data, to determine when the aircraft is in pre-approach phase and when the aircraft is in an approach phase, the processor further configured to; sample, during the pre-approach phase, the ILS signals demodulated by the localizer receiver to thereby generate pre-approach phase ILS data; determine a statistical approach course of the aircraft based at least in part on the pre-approach phase ILS data; sample, during the approach phase, the ILS signals demodulated by the localizer receiver to thereby generate approach phase ILS data; compare the approach phase ILS data to the statistical approach course to determine a course deviation; and selectively generate an alert signal when the course deviation exceeds a predetermined magnitude. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A system for independently monitoring received instrument landing system (ILS) signals onboard an aircraft, comprising:
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an ILS receiver adapted to receive and demodulate ILS signals; a global positioning system (GPS) receiver configured to determine aircraft position and supply aircraft position data representative thereof to the processor, an altimeter configured to sense aircraft altitude and supply altitude data representative of the sensed aircraft altitude; and a processor in operable communication with the localizer receiver, the GPS receiver, and the altimeter, the processor configured, in response to the aircraft position data, to determine actual aircraft position, the processor configured, in response to the altitude data, to determine when the aircraft is in a pre-approach phase and when the aircraft is in an approach phase, and the processor further configured to; sample, during the pre-approach phase, the ILS signals demodulated by the localizer receiver to thereby generate pre-approach phase ILS data; determine a statistical approach course of the aircraft based on the determined aircraft position and the pre-approach phase ILS data; sample, during the approach phase, the ILS signals demodulated by the localizer receiver to thereby generate approach phase ILS data; compare the approach phase ILS signals to the statistical approach course to determine a course deviation; determine when the course deviation exceeds a predetermined magnitude for a predetermined time period; and generate an alert signal when the course deviation exceeds the predetermined magnitude for the predetermined time period. - View Dependent Claims (17, 18, 19)
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Specification