AIRCRAFT NAVIGATION SYSTEM AND METHOD OF NAVIGATING AN AIRCRAFT
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Abstract
An aircraft navigation system and navigation method. The system comprises a civil-certified GPS-receiver for determining first position information based on C/A-GPS-signals, and a military-type GPS-receiver for determining a second position information based on P(Y)-GPS-signals. A monitoring unit detects a first abnormal condition during jamming conditions within the C/A-GPS-signals. The unit compares the first position information with the second position information and detects a second abnormal condition when a difference between these position information is larger than a threshold value for more than a threshold duration. Upon detecting an abnormal condition, an alert procedure is initiated. In remotely piloted aircraft, Command & Control link-loss is also monitored and during link-loss, a transponder code automatically indicates communication failure. When in such situation an abnormal condition is additionally detected, a transponder code indicates airborne emergency and, subsequently, the aircraft navigation system is switched to navigating based on position information from the military-type GPS-receiver.
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Citations
20 Claims
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1-10. -10. (canceled)
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11. An aircraft navigation system comprising:
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a civil-certified GPS-receiver, a military-type GPS-receiver, a monitoring unit, and an alerting unit, wherein the civil-certified GPS-receiver is configured to determine a first position information based on C/A-GPS-signals, wherein the military-type GPS-receiver is configured to determine a second position information based on P(Y)-GPS-signals, wherein the aircraft navigation system is configured to issue aircraft navigation signals based on the first position information when the aircraft is flying under normal navigation conditions in civil airspace, wherein at least one of; the monitoring unit is configured to detect a first abnormal navigation condition upon occurrence of jamming conditions within the C/A-GPS-signals, or the monitoring unit is further configured to compare the first position information with the second position information, and to detect a second abnormal navigation condition upon occurrence of a difference between the first position information and the second position information being larger than a threshold value for more than a threshold duration, and wherein the alerting unit is configured to initiate an alert procedure upon detection of at least one of the first and second abnormal navigation conditions. - View Dependent Claims (12, 13, 14, 15)
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16. A method of navigating an aircraft, the aircraft comprising an aircraft navigation system with
a civil-certified GPS-receiver, a military-type GPS-receiver, wherein the civil-certified GPS-receiver is adapted for determining a first position information based on C/A-GPS-signals, wherein the military-type GPS-receiver is adapted for determining a second position information based on P(Y)-GPS-signals, the method comprising: -
navigating the aircraft according to aircraft navigation signals based on the first position information when the aircraft is flying under normal navigation conditions in civil airspace, at least one of detecting a first abnormal navigation condition upon occurrence of jamming conditions within the C/A-GPS-signals, or comparing the first position information with the second position information, and detecting a second abnormal navigation condition upon occurrence of a difference between the first position information and the second position information being larger than a threshold value for more than a threshold duration, and initiating an alert procedure upon detection of one of the first and second abnormal navigation conditions. - View Dependent Claims (17, 18, 19, 20)
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Specification