Satellite Direction Estimation Using Frequency Domain Power Maximization
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Solution Overview
Problem
The high cost and inefficiency of using conventional TT&C stations for monitoring satellite transfers due to their highly directional antennas, which are expensive to rent for extended periods and prone to interference, especially during long electrical propulsion transfers to geostationary orbits.
Innovation Solution
A method using less directive antennas that estimate the satellite's direction by maximizing reception power in the frequency domain, suppressing interference, and adjusting measurement band widths based on signal uncertainty and Doppler shifts to improve signal-to-noise ratio and frequency selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If highly directional antennas are used in conventional TT&C stations, then reception power is sufficient to decode telemetry signals, but the cost and duration of station rental becomes prohibitive during long electrical propulsion transfers
Solution Approach 1:
The patent changes the key parameter of antenna directionality, transitioning from highly directional antennas to less directive antennas. This parameter change allows the system to maintain adequate signal reception while significantly reducing the need for continuous TT&C station rental, as the less directive antennas can track satellites over longer periods without requiring precise real-time station positioning.
2Loss of time
If less directive antennas are used to reduce TT&C station rental time, then reception power drops below noise floor and interference sensitivity increases
Solution Approach 1:
The patent combines multiple less directive antennas into an antenna array system. By merging the capabilities of multiple antennas, the system achieves coherent signal integration that boosts reception power above the noise floor while maintaining the reduced directionality needed for longer operational periods between TT&C station rentals.
Solution Approach 2:
The patent implements feedback mechanisms that use signal strength and interference level measurements to dynamically adjust antenna beamforming parameters. This feedback loop enables the system to optimize signal reception reliability in real-time, compensating for the reduced directionality of individual antennas and maintaining robust telemetry signal decoding throughout the extended transfer phase.
3Loss of time
If less directive antennas are used, then antenna scanning becomes necessary to locate satellites, but the highly directional nature of TT&C station antennas makes scanning long and expensive
Solution Approach 1:
The patent employs dynamic beamforming capabilities that allow the antenna array to electronically steer and adapt its radiation pattern in real-time. This dynamic control enables rapid satellite acquisition and tracking without physical antenna movement, significantly improving detection efficiency while maintaining the benefit of reduced TT&C station rental duration provided by less directive antennas.
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 reduces the cost and duration of TT&C station rentals by enabling efficient detection and tracking of satellites with less directive antennas, improving signal quality and robustness against interference during extended transfer phases.
Implementation Method 1
a target signal emitted by the satellite
Implementation Method 2
the single-frequency component being affected by a frequency spread
Data Source
AI summary
A method for estimating a direction of a satellite in the transfer phase. The direction of the satellite is estimated relative to a measurement antenna by executing steps for measuring the reception power, by the measurement antenna, of a target signal emitted by the satellite, for different pointing directions of the measurement antenna. The target signal has a substantially sinusoidal component referred to as a single-frequency component. Each power measurement step includes a transposition in the frequency domain of a digital signal, obtained from a signal supplied by the measurement antenna, to obtain a frequency spectrum of the digital signal over a predetermined frequency band having the single-frequency component. The power measurement for the pointing direction being considered is determined based on a maximum value of the frequency spectrum.