Satellite Constellation Multiple Beam Orthogonal Code System
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Solution Overview
Problem
Current satellite constellation systems, particularly LEO, MEO, and GEO systems, face challenges in providing reliable packet data services and hand-off issues due to dynamically varying beam shapes and the need for orthogonal codes to distinguish users within a given frequency band, especially in systems like Globalstar's, which were not addressed by previous patents.
Innovation Solution
A satellite constellation system employing multiple beams and orthogonal codes to connect users to a PSTN or Internet, allowing users to initiate or receive packet data messages, using CDMA technology with Walsh codes for unique identification and employing a gateway connected to either a PSTN or Internet, enabling seamless communication and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If satellite constellation systems use dynamically varying beams to cover moving users, then coverage area and mobility are improved, but hand-off reliability and signal stability deteriorate
Solution Approach 1:
The patent implements dynamic beamforming where satellite beams continuously adjust their orientation and coverage areas to track moving user terminals. The system dynamically reconfigures beam shapes and positions in real-time as satellites orbit and users move, enabling seamless coverage while maintaining connection reliability through automated hand-off protocols between overlapping beam regions.
2Productivity
If multiple users share the same frequency band, then spectral efficiency is improved, but user distinction and signal interference worsen
Solution Approach 1:
The patent assigns unique orthogonal Walsh codes to different users within the same frequency band, creating locally differentiated signal characteristics. Each user's signal is modulated with a specific orthogonal code that allows the receiver to distinguish and separately decode multiple simultaneous transmissions on the same frequency without interference, effectively multiplying the capacity of each frequency channel.
3Adaptability or versatility
If satellite systems provide packet data services, then service versatility is improved, but system complexity and protocol requirements worsen
Solution Approach 1:
The patent implements a universal packet data protocol stack that handles multiple service types (messaging, file transfer, email, browsing) through a common framework. The system uses standardized TCP/IP protocols and application layer protocols that can accommodate various data services without requiring separate dedicated systems, reducing overall complexity while maintaining service versatility through a unified multi-functional architecture.
Data Source
AI summary
A satellite communication system is disclosed which provides at least one satellite employing multiple beams to a plurality of user terminals. A gateway is employed to connect to either a PSTN or an Internet communicating with the user terminal over the constellation so that the users within a given frequency range are distinguished one from the other employing orthogonal codes. The user terminal has the capability of either initiating or receiving packet data messages.