Satellite Antenna Pointing Error Detection via Ground Beacon Demodulation
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Solution Overview
Problem
Current solutions for determining and correcting pointing errors in satellite antennas are inadequate, particularly for multi-spot beam satellites, as they often result in signal quality degradation and interruptions due to beam drift, necessitating improved ground-based methods for accurate orientation maintenance.
Innovation Solution
A method involving a receiving station that demodulates a pointing error signal from a satellite, comprising a first beacon signal and a modulated second beacon signal, to determine the pointing error of the satellite antenna, and generates a control signal to correct the antenna's orientation, using a combination of sum and differential signals transmitted through a tracking feed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If on-board auto-tracking systems or multi-station tracking are used to determine pointing corrections, then satellite antenna orientation can be maintained, but signal quality degradation and service interruptions still occur due to beam drift
Solution Approach 1:
The patent introduces beacon signals as intermediary reference signals transmitted by the satellite that enable ground stations to precisely measure antenna pointing errors. These beacon signals serve as a mediator between the satellite antenna and ground-based measurement systems, allowing accurate determination of pointing deviations without requiring complex on-board tracking systems.
Solution Approach 2:
The patent replaces complex mechanical on-board auto-tracking systems with a ground-based electronic measurement system. Instead of using mechanical sensors and actuators on the satellite to maintain pointing, the system uses ground stations to receive beacon signals, calculate pointing errors, and send correction commands electronically, thereby improving measurement precision and reliability.
2Reliability
If narrow beamwidth directed beams are used for multi-spot beam satellites, then signal quality to target region is improved, but beam drift causes significant signal quality reduction and service interruption
Solution Approach 1:
The patent implements a feedback mechanism where ground stations continuously receive beacon signals from the satellite, determine pointing errors, and send correction commands back to the satellite. This closed-loop feedback system enables real-time compensation for beam drift, maintaining reliable communications links despite the narrow beamwidth used for high signal quality.
Solution Approach 2:
The satellite includes an on-board beacon signal transmitter that automatically provides reference signals for pointing measurement. This self-service capability allows the satellite to generate its own measurement references without requiring external calibration equipment, simplifying the overall system while maintaining link stability.
3Measurement precision
If ground-based beacon signal demodulation is used to determine pointing error, then pointing precision is improved, but system complexity increases due to signal processing requirements
Solution Approach 1:
The patent modulates the beacon signal with specific parameters that encode pointing error information. By changing the signal parameters (frequency, phase, or amplitude modulation) to carry measurement data, the system achieves high measurement precision while keeping the ground-based processing equipment relatively simple, as standard demodulation techniques can extract the pointing error information.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for precise determination and correction of satellite antenna pointing errors, ensuring continuous signal quality and service by accurately aligning the satellite beams with the intended target region, thereby enhancing the reliability of satellite communications.
Implementation Method 1
The receiving station may demodulate the received pointing error signal to recover the second beacon signal with respect to the first beacon signal
Implementation Method 2
a first beacon signal and a modulated second beacon signal transmitted from the satellite antenna under consideration through a tracking feed
Data Source
AI summary
The present application includes systems and methods for determining pointing error of a satellite antenna. In one aspect a method for determining pointing error of a satellite antenna includes receiving, at a receiving station, a pointing error signal formed by the antenna and transmitted from a satellite, wherein the pointing error signal includes a first beacon (reference) signal and a modulated second beacon (error) signal. The receiving station may demodulate the received pointing error signal to recover the second beacon signal with respect to the first beacon signal, and based at least in part on the demodulated beacon signal, the receiving station may determine the pointing error of the satellite antenna.