GNSS Receiver Architecture for Direct L5 Signal Acquisition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional GNSS receivers face challenges in directly acquiring L5 band signals without prior acquisition of L1 band signals, leading to duplication of radiofrequency components and excessive memory requirements, particularly when using discrete Fourier transform computations.
Innovation Solution
A GNSS receiver design that allows direct acquisition of L5 band signals without L1 band signals, utilizing shared cache memory between application processors and a GNSS processing system, on-demand generation of GNSS PRN codes, and array processing architecture to reduce memory usage and improve sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional GNSS receivers acquire L1 band signals first before L5 band signals, then time and frequency information can be obtained for L5 acquisition, but radiofrequency components must be duplicated to receive both L1 and L5 signals simultaneously
Solution Approach 1:
The patent extracts the L1 band signal acquisition step from the conventional two-band approach, enabling direct L5 band signal acquisition without requiring prior L1 band signal processing. This eliminates the need for duplicated radiofrequency components while maintaining reliable signal acquisition through advanced processing techniques.
Solution Approach 2:
The radiofrequency front end is designed to universally receive L5 band signals without requiring separate L1 band reception paths. The same hardware components serve multiple functions by directly processing L5 signals through advanced digital signal processing, eliminating the need for dedicated L1 band radiofrequency chains.
2Device complexity
If direct L5 band signal acquisition is implemented without L1 band signals, then radiofrequency component duplication is eliminated, but acquisition difficulty increases due to signal characteristics
Solution Approach 1:
The patent replaces traditional mechanical signal processing approaches with digital signal processing techniques. Advanced algorithms process the received L5 band signals in the digital domain, overcoming the inherent difficulties of direct L5 acquisition without requiring complex radiofrequency component arrangements.
Solution Approach 2:
The patent changes key processing parameters including signal bandwidth, sampling rates, and processing gain to optimize direct L5 band signal acquisition. By adjusting these parameters, the system overcomes the increased acquisition difficulty while maintaining simplified radiofrequency component structure.
3Reliability
If discrete Fourier transform computations are used for L5 band signal processing, then signal processing capability is enhanced, but memory requirements become excessive
Solution Approach 1:
The patent segments the discrete Fourier transform computation into smaller, manageable parts. By dividing the large-scale DFT into multiple smaller DFT operations processed sequentially or in parallel batches, the memory requirements are reduced while maintaining the enhanced signal processing capability for L5 band signals.
Solution Approach 2:
The patent applies partial DFT computations focusing only on the necessary frequency bins and time samples required for L5 band signal acquisition. Rather than computing complete DFTs of all data, the system performs selective partial computations that reduce memory usage while preserving essential signal processing functionality.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
GNSS receivers and systems within such receivers use improvements to reduce memory usage while providing sufficient processing resources to receive and acquire and track E5 band GNSS signals directly (without attempting in one embodiment to receive L1 GNSS signals). Other aspects are also described.