L5 Signal Direct Acquisition via Dual HRC Engines
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Solution Overview
Problem
The acquisition of GPS L5 signals is more challenging due to their faster and longer pseudo noise (PN) code compared to L1 and L2 signals, requiring existing methods to first acquire and track L1 or L2 signals to narrow the time/frequency search for L5 signals.
Innovation Solution
The described systems and methods enable direct acquisition of GPS L5 signals without prior acquisition of L1 or L2 signals, utilizing high-resolution correlation engines for coherent and non-coherent processing to identify peak accumulations of correlations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If L1 or L2 signals are first acquired and tracked to narrow the time/frequency search for L5 signals, then the acquisition of L5 signals becomes easier, but the system complexity and power consumption increase due to requiring multiple signal acquisition processes
Solution Approach 1:
The patent extracts the L5 signal acquisition process from the traditional multi-signal dependency chain, enabling L5 signals to be acquired independently without requiring prior L1 or L2 signal tracking. This is achieved through enhanced correlation techniques that directly process L5 signals with improved time/frequency search algorithms, eliminating the need for preliminary acquisition of other signals while reducing system complexity
Solution Approach 2:
The patent creates a universal L5 signal acquisition method that can operate standalone or in combination with other signals. The acquisition engine is designed to handle L5 signals with a ten-times faster PN code chip rate and ten-times longer PN code length independently, making the system flexible to operate in L1-only mode, L5-only mode, or both modes without requiring sequential acquisition processes
2Difficulty of detecting and measuring
If L1 or L2 signals are first acquired and tracked to narrow the time/frequency search for L5 signals, then the acquisition of L5 signals becomes easier, but the power consumption increases due to multiple signal processing stages
Solution Approach 1:
The patent extracts the L5 signal acquisition process from the traditional multi-signal dependency chain, enabling L5 signals to be acquired independently without requiring prior L1 or L2 signal tracking. This is achieved through enhanced correlation techniques that directly process L5 signals with improved time/frequency search algorithms, eliminating the need for preliminary acquisition of other signals while reducing system complexity
Solution Approach 2:
The L5 signal acquisition system performs self-service by independently acquiring and tracking L5 signals without relying on information from L1 or L2 signals. The system uses its own enhanced correlation engine and time/frequency search algorithms to directly process L5 signals, making the acquisition process self-sufficient and reducing overall power consumption by eliminating redundant processing stages
3Productivity
If L5 signals are acquired directly without L1 or L2 signal preprocessing, then the system operates more efficiently with lower power consumption, but the acquisition difficulty increases due to faster and longer PN code
Solution Approach 1:
The patent applies parameter changes to the correlation process by adjusting correlation width, accumulation length, and time/frequency search parameters specifically optimized for L5 signals with ten-times faster PN code chip rate and ten-times longer PN code length. These parameter adjustments enable direct L5 signal acquisition while maintaining acquisition effectiveness without requiring L1 or L2 signal preprocessing
Solution Approach 2:
The patent performs preliminary action by pre-configuring the correlation engine with optimized parameters for L5 signal characteristics before acquisition begins. The system prepares time/frequency search ranges and correlation accumulation settings in advance based on known L5 signal properties, enabling efficient direct acquisition without requiring runtime adaptation or preliminary L1/L2 signal tracking
Data Source
AI summary
A method and an apparatus are provided in which data is loaded from a memory to an input sample memory (ISM) of a user equipment (UE). The data corresponds to input from an L5 antenna of the UE. A first high-resolution correlation (HRC) engine of the UE performs coherent correlation and accumulation on the data for at least one code-frequency offset combination, to generate coherent correlation results. A second HRC engine of the UE processes the coherent correlation results by at least performing frequency widening and non-coherent accumulation to generate non-coherent correlation results indicating at least peak accumulations of correlations.