Aircraft Guidance Localizer Capture Rectilinear Deviation
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Solution Overview
Problem
Instrument Landing Systems (ILS) often result in localizer overshoots due to the narrow course guidance sector, which can lead to fuel wastage, passenger discomfort, and increased air traffic congestion, especially when aircraft intercept with large angles or are close to the airfield.
Innovation Solution
The system allows aircraft to initiate reposition maneuvers before reaching the course guidance sector by determining a rectilinear deviation and using aircraft characteristics such as velocity, track angle, and bank angle to compute a location for initiating the maneuver, enabling performance at larger intercept angles and reducing overshoots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the aircraft waits until reaching the course guidance sector to begin the reposition maneuver, then the localizer indication remains accurate, but the aircraft may overshoot the desired path due to the narrow sector width
Solution Approach 1:
The system calculates and initiates the reposition maneuver before the aircraft reaches the course guidance sector. By computing the required heading change and beginning the turn in advance, the aircraft can complete its repositioning within the narrow sector without overshooting, thus maintaining both measurement precision and path alignment precision.
2Manufacturing precision
If the aircraft begins the reposition maneuver early, then overshoot is reduced, but the aircraft may fly through the null and overshoot the desired path
Solution Approach 1:
The system continuously monitors the aircraft's position relative to the course guidance sector and uses real-time feedback to adjust the reposition maneuver. By calculating the precise point to begin the turn based on aircraft speed, intercept angle, and sector position, the system ensures the aircraft completes its repositioning exactly when needed, avoiding both early and late initiation problems.
3Productivity
If the aircraft intercepts the localizer with a large intercept angle or high ground speed, then the approach is more efficient, but the overshoot is exacerbated
Solution Approach 1:
The system calculates the optimal initiation point for the reposition maneuver based on the aircraft's intercept angle and ground speed. By beginning the turn earlier for aircraft with larger intercept angles or higher speeds, the system provides sufficient time to complete the repositioning without overshooting, thus maintaining both approach efficiency and path alignment precision.
Data Source
AI summary
Systems and methods for aircraft guidance using a localizer capture criteria for rectilinear displacement data are disclosed. In one embodiment, the method includes determining a rectilinear deviation D between a current aircraft location and a final defined path (FDP) of an aircraft and determining a location at which the aircraft should begin a reposition maneuver based on the rectilinear deviation D. The method starts a reposition maneuver of the aircraft at a location determined based on a relationship between D and characteristics of the aircraft during the reposition maneuver. In some embodiments, the characteristics of the aircraft may include a velocity of the aircraft with respect to ground, an aircraft track angle, a heading of the FDP of the aircraft, a maximum allowed bank angle of the aircraft during a reposition maneuver, and a time allowance for aircraft rollup and rollout.