Satellite Antenna SNR Selection for Adjacent Satellite Interference
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Solution Overview
Problem
Small satellite antennas are vulnerable to adjacent satellite interference due to broad beam patterns and overlapping frequency bands, leading to incorrect satellite tracking, particularly with satellites like Koreasat 5A and 6A.
Innovation Solution
A satellite antenna system that calculates signal-to-noise ratios (SNR) for multiple satellites, selectively chooses the satellite with the highest SNR, and adjusts antenna direction if necessary to ensure accurate tracking, using both directional and omnidirectional antennas to filter out ambient noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a small antenna is used to reduce size and cost, then the antenna size is reduced, but the beam pattern broadens and directionality decreases causing adjacent satellite interference
Solution Approach 1:
The patent segments the signal processing function by separating the desired satellite signal from adjacent satellite signals and noise through SNR calculation. The system divides the received composite signal into distinguishable components by calculating signal-to-noise ratios for different satellite signals, enabling selective tracking of the target satellite even with a small antenna's broad beam pattern.
Solution Approach 2:
The patent changes the selection criterion from simple signal strength to signal-to-noise ratio (SNR). By calculating and comparing SNR values of different satellite signals, the system can accurately identify and track the desired satellite signal while rejecting adjacent satellite interference, thereby maintaining directionality precision despite using a small antenna.
2Device complexity
If conventional signal strength-based tracking is used, then the tracking method is simple, but adjacent satellites with stronger signals are mistakenly identified
Solution Approach 1:
The patent introduces a feedback mechanism where the system calculates SNR values for received satellite signals, compares them against threshold values, and adjusts satellite selection accordingly. This feedback loop ensures that the system continuously identifies and tracks the satellite with the highest SNR, preventing mistaken identification of adjacent satellites with stronger but interfering signals.
Solution Approach 2:
The patent changes the evaluation parameter from signal strength alone to signal-to-noise ratio. This parameter transformation allows the system to distinguish between desired signals and interfering signals more accurately, as SNR accounts for both the desired signal level and the background noise/interference level, thereby improving identification reliability.
3Adaptability or versatility
If the antenna beam pattern is broadened to receive more signals, then signal coverage is improved, but adjacent satellite interference increases
Solution Approach 1:
The patent extracts the desired satellite signal from the composite received signal by calculating and comparing SNR values. The system takes out the target satellite signal from the mixture of multiple satellite signals and noise, enabling selective reception and processing of only the desired signal while effectively filtering out adjacent satellite interference through the SNR-based selection mechanism.
Data Source
AI summary
A satellite antenna has a function for excluding adjacent satellite interference. The satellite antenna according to an embodiment includes an antenna unit for receiving a signal from a satellite, an signal-to-noise ratio (SNR) calculation unit configured to calculate a signal-to-noise ratio (SNR) for a satellite signal received by the antenna unit, and a signal selection unit configured to compare signal-to-noise ratios calculated by the SNR calculation unit for satellite signals from a multiple number of satellites and select one satellite signal.