Satellite Path Calibration for Uniform Beam Power and Switchover
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High Throughput satellite (HTS) systems face challenges in maintaining uniform power levels across beams, leading to issues in beam selection and signal fluctuations, particularly in feeder and mobile links, which can result in control channel outages and sub-band switching errors.
Innovation Solution
A method and system for satellite path calibration involving gateway and spacecraft calibration, utilizing a calibration-modulated wave (CMW) signal for power measurement, root raised cosine filtering, and calculating correction factors to adjust transmission power across frequency slots, ensuring uniform power levels and robust beam selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a satellite transmits multiple sub-bands on a single frequency slot for high throughput, then the data transmission capacity is improved, but signal fluctuation across frequency over time increases causing control channel outages
Solution Approach 1:
The patent segments the frequency slot into multiple sub-bands for parallel data transmission, improving throughput. It also segments the calibration process into frequency-bin-level measurements, allowing precise identification and correction of signal fluctuations in specific sub-bands without affecting the entire frequency slot.
Solution Approach 2:
The patent dynamically adjusts transmission power parameters for each sub-band based on measured signal fluctuations. By calculating frequency-specific correction factors and applying targeted power adjustments, the system maintains control channel reliability while preserving high data transmission capacity across multiple sub-bands.
2Productivity
If the satellite routes two sub-bands on a single frequency slot to maximize bandwidth utilization, then the spectral efficiency is improved, but beam selection accuracy deteriorates due to power level variations
Solution Approach 1:
The patent applies local quality by performing calibration and power adjustment at the frequency-bin level rather than uniformly across the entire frequency slot. This allows each sub-band to have optimized power levels tailored to its specific characteristics, ensuring accurate beam selection while maintaining high spectral efficiency through multi-sub-band transmission.
Solution Approach 2:
The patent implements a feedback mechanism where the satellite measures received signal power for each frequency bin, compares it against target power levels, calculates correction factors, and adjusts transmission power accordingly. This closed-loop feedback ensures uniform power levels across sub-bands, enabling accurate beam selection by user terminals.
3Stability of the object's composition
If the satellite performs frequency-specific power calibration across multiple sub-bands, then the uniformity of power levels is improved, but the calibration complexity and processing time increase
Solution Approach 1:
The patent extends the calibration dimension from sub-band level to frequency-bin level, enabling fine-grained power measurement and adjustment. By operating in this finer frequency dimension, the system achieves superior power level uniformity across all sub-bands while using efficient algorithms to manage the increased measurement and processing requirements.
Data Source
AI summary
A method for setting a calibration signal power, the method including: transmitting a calibration-modulated wave (CMW) signal at a frequency slot; receiving a power measurement of the CMW signal; calculating a calibration correction factor for the frequency slot based on the power measurement; and adjusting a transmission power of the CMW signal at the frequency slot based on the calibration correction factor. A method for switching over a control channel and a voice channel from an old sub-band to a new-sub-band, the method including: switching over control channel and voice channel among multiple GW components and satellite payload; predicting switchover time to reduce control channel and voice channel outage time during switchover.