Orbital Transceiver Adapts Terrestrial Links to Delay and Doppler
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Solution Overview
Problem
Existing terrestrial communication systems struggle to maintain reliable and efficient communication with mobile stations in environments that exceed their design assumptions, such as those found in Earth orbit, due to greater distances and relative motion, requiring modifications to mobile stations that are often cost-prohibitive and complex.
Innovation Solution
A multiple-access transceiver system adapted for orbital environments that includes a data parser, signal timing module, and programmable radio to communicate with terrestrial mobile stations using terrestrial base station protocols, without necessitating modifications to the mobile stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If terrestrial base station protocols are used for orbital communication, then mobile station compatibility is improved, but communication reliability deteriorates due to greater distances and relative motion
Solution Approach 1:
The patent introduces a base station in orbit as an intermediary that adapts terrestrial protocols to orbital conditions. This orbital base station acts as a mediator between terrestrial mobile stations and the orbital environment, handling protocol translation and signal adjustment without requiring modifications to the mobile stations themselves.
Solution Approach 2:
The system dynamically adjusts communication parameters including frequency offset compensation for Doppler shift, timing advance for propagation delay, and power control levels to account for the orbital distance. These parameter changes enable reliable communication while maintaining protocol compatibility.
2Reliability
If mobile stations are modified to support orbital environments, then communication reliability is improved, but device complexity and cost increase
Solution Approach 1:
Instead of modifying the mobile stations to adapt to orbital conditions, the invention inverts the approach by placing the adaptation functionality in the orbital base station. The mobile stations remain unchanged while the orbital base station performs the complex signal processing and protocol adaptation.
Solution Approach 2:
The orbital base station serves as an intermediary that absorbs the complexity of orbital communication requirements. It handles frequency offset, timing adjustments, and power control calculations, shielding the simple mobile stations from these complexities.
3Area of stationary object
If communication distance is extended to orbital ranges, then coverage area is improved, but signal timing and synchronization become more difficult to maintain
Solution Approach 1:
The system performs preliminary timing advance calculations based on known orbital parameters and propagation models. By pre-calculating the timing adjustments required for the specific orbital distance and relative motion, the system maintains synchronization without requiring continuous complex measurements during communication.
Solution Approach 2:
The orbital base station continuously monitors signal quality and adjusts timing parameters based on feedback from the mobile station. This feedback mechanism allows the system to compensate for variations in orbital position and maintain synchronization despite the extended distance.
4Stability of the object's composition
If relative motion between satellite and mobile station is accounted for, then communication stability is improved, but system complexity increases
Solution Approach 1:
The system dynamically adjusts frequency offset and timing parameters in real-time to account for the relative motion between the orbital base station and mobile station. This dynamic adaptation compensates for Doppler shift and maintains communication stability without requiring complex hardware modifications.
Data Source
AI summary
A multiple-access transceiver handles communications with mobile stations in environments that exceed mobile station design assumptions without necessarily requiring modifications to the mobile stations. One such environment is in Earth orbit. The multiple-access transceiver is adapted to close communications with mobile stations while exceeding mobile station design assumptions, such as greater distance, greater relative motion and/or other conditions commonly found where functionality of a terrestrial transceiver is to be performed by an orbital transceiver. The orbital transceiver might include a data parser that parses a frame data structure, a signal timing module that adjusts timing based on orbit to terrestrial propagation delays, frequency shifters and a programmable radio capable of communicating from the Earth orbit that uses a multiple-access protocol such that the communication is compatible with, or appears to the terrestrial mobile station to be, communication between a terrestrial cellular base station and the terrestrial mobile station.