Hybrid Network Signal Synchronization via Temporal Shifting
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Solution Overview
Problem
In hybrid communication networks, the temporal differences between satellite and terrestrial signal paths lead to jamming effects due to identical radio signals reaching user terminals with temporal differences exceeding the threshold, making synchronization of emitters impossible, thus affecting signal quality and network flexibility.
Innovation Solution
The method involves temporally shifting the retransmission of user signals by terrestrial emitters based on their relative positions to a reference position, ensuring that satellite and emitter signals arrive at user terminals nearly simultaneously, using a time marker adjusted for each emitter's local duration, which depends on its distance from the satellite and a reference arc.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If identical radio signals are transmitted by both satellite and terrestrial emitters using the same frequency, then network coverage and flexibility are improved, but temporal differences between signal paths cause jamming effects that degrade signal quality
Solution Approach 1:
The patent applies preliminary action by calculating and applying temporal shifts to terrestrial emitter transmissions before the signals are actually transmitted. The network controller determines the appropriate shift duration based on the emitter's position and the satellite's location, then pre-adjusts the transmission timing so that when signals from both satellite and terrestrial emitters arrive at user terminals, they do so simultaneously within the same time window, preventing jamming effects while maintaining network flexibility
Solution Approach 2:
The patent changes the temporal parameter of signal transmission by introducing variable time shifts to terrestrial emitter signals. Instead of transmitting at fixed times, the system dynamically adjusts the transmission timing parameter based on the emitter's geographic position, the satellite's current location, and the required synchronization threshold, thereby transforming a static transmission system into a dynamically synchronized one that eliminates jamming while preserving coverage flexibility
2Reliability
If transparent emitters equipped with satellite receivers are used to retransmit satellite signals, then signal synchronization is improved, but device complexity and insulation requirements increase significantly
Solution Approach 1:
The patent extracts the satellite signal reception function from the terrestrial emitters themselves and separates it into a dedicated satellite receiver component. By taking out this function and providing it as an external input to the emitter's signal processing chain, the system achieves synchronized retransmission without requiring the emitter to contain integrated satellite reception capabilities, thereby reducing overall system complexity while maintaining synchronization reliability
Solution Approach 2:
The patent introduces a network controller as an intermediary that receives satellite signal information, calculates the appropriate temporal shifts, and distributes synchronization commands to terrestrial emitters. This intermediary mediator coordinates between the satellite transmissions and terrestrial retransmissions without requiring direct integration within each emitter, simplifying the emitter design while ensuring reliable synchronization across the network
3Stability of the object's composition
If emitters synchronize transmissions to an absolute time reference, then continuous coverage is improved, but this solution is not feasible in hybrid networks due to excessive temporal differences between satellite and terrestrial paths
Solution Approach 1:
The patent applies local quality by implementing position-specific temporal shifts for each terrestrial emitter based on its unique geographic location. Instead of using a uniform absolute time reference that fails across the entire hybrid network, the system tailors the synchronization approach locally to each emitter's position relative to the satellite, calculating individualized time adjustments that account for varying signal path lengths and ensuring continuous coverage feasibility across diverse locations
Data Source
AI summary
A method is devoted to synchronizing the transmission of user signals within a single-frequency hybrid network comprising at least one transmission satellite (SAT) and regenerative emitters (E1-E6) tasked with retransmitting received user signals to user terminals (T1, T2), using the same frequency and the same waveform. This method consists of temporally shifting, with respect to a time marker (TM) corresponding to the moment when a chosen element of the user signals arrives at a terrestrial reference arc (RA) from said satellite (SAT), the moment when the user signals received by each emitter (E1-E6) are retransmitted, by a local duration which is a function of the respective positions of the emitter and the satellite (SAT) with respect to a chosen reference position (RP) on said arc (RA), so that the same user signals retransmitted by the satellite (SAT) and the emitter (Ei) reach a user terminal (T1, T2) at roughly the same time.