Satellite Navigation Signal Generation With Carrier Frequency Offset
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Solution Overview
Problem
Satellite navigation systems face challenges in maintaining constant envelope multiplexing while applying carrier frequency offsets, leading to increased implementation complexity and difficulty in designing signal generators due to asymmetric interference characteristics across different frequency bands.
Innovation Solution
A method of selectively applying carrier frequency offsets to pairs of quadrature signals on a sample period basis, using specific sign inversion patterns and channel switching to maintain constant envelope multiplexing, thereby reducing implementation complexity and allowing for asymmetric spectrum designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier frequency offsets are applied to signals in different frequency bands, then asymmetric interference characteristics can be addressed and frequency spectrum efficiency is improved, but the complexity of implementing a signal generator increases and constant envelope multiplexing becomes difficult to design
Solution Approach 1:
The patent applies different carrier frequency offsets to signals in different frequency bands to address asymmetric interference characteristics. By intentionally introducing asymmetric frequency shifts, the system can optimize spectrum utilization and reduce interference between signals occupying different frequency resources, thereby improving overall frequency spectrum efficiency while managing signal generator complexity through structured offset assignment
Solution Approach 2:
The patent changes the carrier frequency parameter by applying specific frequency offsets to signals. This parameter modification allows the system to adapt to different interference conditions and spectrum availability, enabling flexible spectrum management and improved frequency utilization without requiring complete redesign of the signal generation architecture
2Adaptability or versatility
If carrier frequency offsets are applied to signals, then asymmetric spectrum design is enabled, but it becomes difficult to maintain constant envelope multiplexing conditions
Solution Approach 1:
The patent introduces asymmetric carrier frequency offsets to enable flexible spectrum design and accommodate different interference scenarios. By carefully selecting offset values and applying them systematically to different signal groups, the patent achieves asymmetric spectrum utilization while maintaining signal quality and multiplexing performance through coordinated frequency management
Solution Approach 2:
The patent dynamically adjusts carrier frequency offsets based on interference conditions and spectrum availability. This dynamic parameter adjustment allows the system to adapt to changing environmental conditions while maintaining constant envelope multiplexing through real-time coordination of frequency offsets and signal phases, ensuring reliable operation across diverse scenarios
3Productivity
If multiple satellite navigation signals are multiplexed on the same carrier, then frequency spectrum efficiency is improved, but the power magnitude becomes non-constant causing spectrum distortion due to HPA nonlinearity
Solution Approach 1:
The patent employs constant envelope multiplexing techniques that utilize periodic signal structures and phase modulation to maintain constant power magnitude across multiplexed signals. By organizing signals into structured formats with regular phase transitions and constant amplitude characteristics, the system achieves high frequency spectrum efficiency through dense signal packing while avoiding the spectrum distortion that would result from power amplifier nonlinearity
Data Source
AI summary
A method of a satellite navigation signal generation device may comprise: receiving a plurality of signals; assigning carrier frequency offset(s) to at least one pair of signals among the plurality of signals; and generating a constant envelope multiplexed signal for the plurality of signals including the at least one pair of signals to which the carrier frequency offset(s) are assigned.