Airborne Goniometry Calibration via Remote Reference Clock
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Solution Overview
Problem
Current calibration methods for airborne goniometry apparatuses are either imprecise when conducted in a laboratory or lengthy and tedious when performed outdoors, especially due to synchronization challenges during frequency scanning.
Innovation Solution
A method utilizing a remote calibration generator synchronized with the airborne goniometry apparatus via an external reference clock, such as an atomic or satellite clock, to share a calibration sequence and start time, ensuring precise and efficient calibration under real-world conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration is performed in a laboratory (anechoic chamber), then calibration precision is improved, but calibration accuracy under real operating conditions deteriorates
Solution Approach 1:
A remote calibration generator acts as an intermediary device, located at a known geographical position away from the airborne goniometry apparatus. This generator emits calibration signals that allow the apparatus to be calibrated under real operating conditions (outdoors, airborne) rather than in a laboratory, while maintaining synchronization through a shared clock reference.
Solution Approach 2:
The airborne goniometry apparatus calibrates itself in situ by receiving signals from the remote calibration generator. The system performs self-calibration during actual flight operations using the shared clock reference and known generator position, eliminating the need for separate laboratory calibration procedures.
2Reliability
If calibration is performed outdoors with frequency scanning, then calibration accuracy under real conditions is improved, but calibration time increases
Solution Approach 1:
The system uses a shared clock reference that provides continuous time synchronization feedback between the airborne goniometry apparatus and the remote calibration generator. This feedback mechanism allows the apparatus to automatically track and synchronize with the generator's frequency scanning signals, eliminating the need for manual synchronization adjustments during calibration.
Solution Approach 2:
The calibration generator and airborne apparatus pre-share the clock reference before calibration begins. This preliminary synchronization action establishes a common time base that enables automatic tracking during frequency scanning, significantly reducing the time required for outdoor calibration compared to manual methods.
3Ease of operation
If manual synchronization is used during outdoor calibration, then synchronization flexibility is improved, but synchronization precision deteriorates due to clock drifts
Solution Approach 1:
The shared clock reference provides continuous time synchronization feedback to both the calibration generator and the airborne goniometry apparatus. This feedback ensures that both devices maintain precise synchronization throughout the calibration process, eliminating clock drift issues that plague manual synchronization methods.
Solution Approach 2:
The shared clock reference serves multiple functions simultaneously: it provides time synchronization for frequency scanning, enables automatic tracking of calibration signals, and allows for precise position determination. This universal time reference replaces multiple separate synchronization mechanisms, improving both precision and ease of operation.
Data Source
AI summary
A method and installation for calibrating an airborne goniometry apparatus by means of a calibration generator, remote from the airborne goniometry apparatus. The method includes sharing, between the goniometry apparatus and the calibration generator, a calibration sequence. The method also includes sharing, between the goniometry apparatus and the calibration generator, a start time of the calibration sequence. The method further includes executing the calibration sequence by the goniometry apparatus and by the calibration generator, at the start time. The start time is determined in reference to the same clock, referred to as a reference clock, provided to the goniometry apparatus and the calibration generator, by an external source.