Multi-Receiver Signal Processing for Timing Alignment and Doppler Compensation
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Solution Overview
Problem
Low orbit satellites face challenges in maintaining synchronized sample timings across multiple reception systems, leading to characteristic degradation of reception beam control, particularly in LoRa and high transmission rate LPWA methods, due to sample timing deviations and increased power consumption.
Innovation Solution
A signal processing apparatus and method that includes a first timing correction unit to detect and correct sample timing deviations, a frame detection unit to compensate for Doppler shift, and a beam control unit to perform reception beam control, utilizing a base station to synchronize and decode signals across multiple reception systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple reception systems are mounted on a low orbit satellite to perform reception beam control, then the ability to extract desired signals from multiple satellite IoT terminals is improved, but sample timing deviations occur leading to characteristic degradation of reception beam control
Solution Approach 1:
The patent applies preliminary action by performing sample timing correction before reception beam control processing. The correction unit提前 corrects sample timing deviations in waveform data from multiple reception systems using correlation processing with known signals, ensuring synchronized timing before the data is used in beam control operations, thereby preventing timing-related performance degradation
Solution Approach 2:
The patent uses an intermediary approach by introducing a correction unit that acts as a mediator between the multiple reception systems and the reception beam control unit. This correction unit processes waveform data from various reception systems, aligns their timing using known signals as a reference, and outputs corrected data to the beam control unit, thus resolving timing synchronization issues without requiring hardware modifications to the reception systems
2Adaptability or versatility
If a low orbit satellite includes receivers for multiple LPWA methods to improve compatibility, then adaptability to different IoT terminals is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent applies universality by implementing a unified waveform sampling and signal processing architecture that can handle multiple LPWA methods (LoRa, Sigfox, ELTRES, etc.) through a single reception system. The universal processor performs correlation processing with known signals from different LPWA methods and executes reception beam control for all methods, eliminating the need for separate dedicated receivers for each LPWA standard while maintaining full compatibility
Solution Approach 2:
The patent uses parameter changes by adjusting processing parameters rather than hardware configuration to support different LPWA methods. The system changes correlation processing parameters, known signal patterns, and beam control parameters dynamically based on which LPWA method is being used, allowing a single receiver to adapt to multiple standards without physical reconfiguration or increased complexity
3Measurement precision
If a low orbit satellite performs reception beam control and signal processing to extract desired signals, then signal extraction accuracy is improved, but power consumption increases due to large amount of signal processing
Solution Approach 1:
The patent applies preliminary action by performing sample timing correction and known signal detection before reception beam control processing. By pre-correcting timing deviations and identifying known signals in advance, the system reduces the computational burden during the actual beam control operation, thereby lowering power consumption while maintaining extraction accuracy
Solution Approach 2:
The patent extracts and processes only the essential components needed for beam control - specifically focusing on correlation processing with known signals and timing correction - while discarding or deferring less critical processing steps. This selective extraction of necessary processing operations reduces overall computational load and power consumption while preserving the core signal extraction functionality
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
Reduces characteristic degradation of reception beam control by synchronizing sample timings and compensating for Doppler shift, even in the presence of deviations, thereby improving signal processing efficiency and reducing power consumption.
Implementation Method 1
a first timing correction unit that detects sample timing deviations among a plurality of reception systems on a basis of known signal sections included in waveform data
Implementation Method 2
a frame detection unit that detects frames of radio signals in the waveform data with the sample timing deviations corrected and performs compensation for a Doppler shift on the detected frames
Data Source
AI summary
A signal processing apparatus includes a timing correction unit, a frame detection unit, a beam control unit, and a decoding unit. The timing correction unit detects sample timing deviations among reception systems on the basis of known signal sections included in waveform data having been obtained by sampling waveforms of radio signals having been received by a communication apparatus using the plurality of reception systems and performs processing of correcting the detected sample timing deviations on the waveform data. The frame detection unit detects frames of radio signals in the waveform data with the sample timing deviations corrected and performs compensation for a Doppler shift on the detected frames. The beam control unit performs reception beam control on the plurality of frames on which the compensation for the Doppler shift has been performed. The decoding unit decodes signals having been obtained through the reception beam control and obtains data having been transmitted by the radio signals.