Satellite Signal Combiner for Flat-Panel Antenna Arrays
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Solution Overview
Problem
In satellite communication using electrically-steerable flat-panel antennas, achieving high bit rates is hindered by insufficient signal-to-noise ratio (SNR) and gain-to-noise temperature (G/T) due to weak satellite signals, which existing RF combining technologies struggle to address effectively.
Innovation Solution
A combiner system that coordinates multiple antennas to combine signals coherently based on signal quality metrics, selecting the best antenna for transmission and aggregating data as if from a single antenna, thereby enhancing the effective G/T and suppressing noise floor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single antenna is used for satellite communication, then the device complexity is low, but the signal-to-noise ratio and gain-to-noise temperature are insufficient for high bit rate reception
Solution Approach 1:
The patent combines multiple antenna elements into a unified antenna array system that operates cooperatively. The combiner circuit merges signals from multiple antennas while maintaining phase coherence, effectively increasing the signal-to-noise ratio and gain-to-noise temperature without requiring a proportionally complex control system. This merging approach allows the system to achieve high bit rate reception capabilities that would be impossible with a single antenna.
2Reliability
If multiple antennas are combined to improve signal quality, then the receive link performance increases, but the system complexity and coordination requirements increase
Solution Approach 1:
The antenna elements and combiner are designed to operate with minimal external coordination. Each antenna element independently receives signals and passes them to the combiner, which automatically performs signal merging based on inherent phase relationships. The system self-adjusts to maintain coherence without requiring complex real-time control algorithms or active phase correction mechanisms, thereby reducing operational complexity while maintaining high receive link performance.
3Productivity
If RF combining is implemented to achieve high G/T antenna performance, then the bit rate reception capability improves, but the noise floor suppression becomes more challenging
Solution Approach 1:
The system incorporates feedback mechanisms where the combiner monitors the combined signal quality and adjusts the weighting and phasing of individual antenna contributions in real-time. This feedback loop enables the system to optimize signal coherence and actively suppress noise components that would otherwise limit the bit rate reception capability. The feedback-driven adjustment allows the system to maintain high G/T performance while effectively managing the noise floor.
Data Source
AI summary
A combining apparatus for use in a satellite communication system and a method for using the same. In one embodiment, the apparatus comprises: a plurality of antennas that each have a transmit aperture and a receive aperture and are operable to receive correlated signals from a satellite, wherein the receive aperture is operable to receive one of the signals from the satellite and determine its signal quality; a combiner communicably coupled to the plurality of antennas to combine multiple signals received from the plurality of antennas into one signal, wherein the combiner is operable to determine which signals received by the plurality of antennas are to be combined into the one signal based, at least in part, on at least one signal quality metric regarding the signals, the at least one signal quality metric being received from one or more tracking receivers external to the combiner; and a modem communicably coupled to receive the one signal from the combiner, wherein the modem is operable to send information to the plurality of antennas via the combiner as if only a single antenna is coupled to the combiner and the combiner is operable to aggregate information for the modem received from antennas in the plurality of antennas as if one single antenna provided the information to the combiner.