GEO Ground Station Tracking Receiver Phase Calibration
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Solution Overview
Problem
Existing satellite communication systems require labor-intensive phase matching processes and manual adjustments, which can be disrupted by temperature changes and time shifts, leading to inefficiencies and potential damage to RF cables.
Innovation Solution
A tracking receiver system that concurrently receives communication signals at a first frequency and calibration signals at a second frequency, allowing for phase calibration without interrupting communications. The system determines phase values for the calibration frequency and uses receiver calibration factors to calculate phase corrections for the communication frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If labor-intensive phase matching process with manual adjustments is used, then phase accuracy can be achieved, but system complexity and time consumption increase significantly
Solution Approach 1:
The patent replaces manual mechanical phase matching operations with automated electronic phase detection and adjustment circuits. The system uses electronic phase detectors and automated control circuits to achieve phase synchronization without manual intervention, thereby maintaining phase accuracy while reducing system complexity and operational burden.
Solution Approach 2:
The patent implements self-calibrating circuits that automatically detect and correct phase mismatches without external intervention. The phase detection circuits continuously monitor phase relationships and automatically adjust phase shifters to maintain synchronization, enabling the system to self-correct and reducing the need for manual phase matching.
2Measurement precision
If RF cables are trimmed manually in the field, then phase matching can be achieved, but labor time and potential for damage increase
Solution Approach 1:
The patent replaces mechanical RF cable trimming with electronic phase adjustment mechanisms. Instead of physically cutting or trimming cables to achieve phase matching, the system uses electronic phase shifters and adjustable delay circuits that can be tuned electronically, eliminating the need for manual cable trimming and reducing both labor time and risk of cable damage.
Solution Approach 2:
The patent implements dynamically adjustable phase control circuits that can be tuned in real-time without physical modification of the RF paths. The phase shifters and delay elements can be adjusted electronically during operation, providing flexible phase matching without the permanent commitments required by cable trimming.
3Measurement precision
If amplifiers are matched to a reference manually, then phase consistency can be achieved, but time consumption and potential for temperature-induced phase shifts increase
Solution Approach 1:
The patent implements self-calibrating amplifier circuits with automatic reference tracking. The amplifiers continuously monitor their phase relationship to a reference signal and automatically adjust their phase shift to maintain consistency, eliminating the need for manual matching and enabling real-time compensation for temperature-induced phase variations.
Solution Approach 2:
The patent employs feedback circuits that continuously monitor the phase output of amplifiers and automatically adjust phase control elements to maintain reference alignment. This closed-loop feedback mechanism ensures phase consistency is maintained dynamically, compensating for temperature drift and other environmental variations without manual intervention.
4Measurement precision
If tracking techniques are performed at communication frequency, then phase tracking accuracy is improved, but communication signal interruption occurs
Solution Approach 1:
The patent separates the tracking function from the communication function by using a dedicated tracking signal path that operates independently from the communication signal path. A portion of the communication signal is extracted via coupling elements to provide a tracking reference, allowing phase tracking to be performed on a separate channel without interrupting the main communication flow.
Solution Approach 2:
The patent uses coupling elements and signal extraction circuits as intermediaries to obtain tracking reference signals from the communication path without disrupting the communication signal itself. These intermediary elements allow the tracking system to access phase information needed for accurate tracking while leaving the communication signal intact and uninterrupted.
Data Source
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AI summary
A geosynchronous equatorial orbit (GEO) ground station may concurrently receive at a tracking receiver both a first signal (downlink data) at a first frequency from a GEO satellite and an internally-generated calibration signal at a second frequency.. Based on the calibration signal, the tracking receiver may determine a first phase value for the second frequency, then, from the first phase value, determine a second phase value associated with the first frequency based on a first phase offset between the first frequency and the second frequency according to a set of receiver calibration factors, then generate a phase correction value for signals received at the first frequency without interrupting the downlink data coming from the GEO satellite. Having accurate phasing allows the tracking receiver to report tracking errors correctly to the antenna controller and therefore allow for improved tracking performance.