GPS Receiver SA Data Generation for Sensitivity
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Solution Overview
Problem
Mobile-based GPS positioning in terminals faces decreased GPS reception sensitivity due to the absence of Sensitivity Assistance (SA) data, which restricts coherent integration time and affects continuous position solution calculations.
Innovation Solution
An apparatus and method in a mobile terminal generate SA data by estimating navigation data bits using basic information from a Position Determination Entity (PDE) server, allowing for coherent integration similar to true SA data without additional data reception, thereby increasing GPS reception sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If mobile-based GPS positioning is used without SA data, then device complexity is reduced, but GPS reception sensitivity deteriorates
Solution Approach 1:
The patent generates a copy of the navigation data bits (SA data) by estimating and reproducing the in-phase and quadrature components of the satellite signal. This synthesized SA data enables coherent integration without requiring actual SA data reception, thus maintaining GPS reception sensitivity while avoiding the complexity of additional data reception systems
Solution Approach 2:
The patent introduces an intermediary process that estimates navigation data bits by generating in-phase and quadrature components from available signal information. This intermediary estimation mechanism bridges the gap between mobile-based positioning without SA data and the need for coherent integration, allowing sensitivity improvement without direct SA data input
2Reliability
If coherent integration time is extended to improve sensitivity, then GPS reception sensitivity is improved, but processing time increases
Solution Approach 1:
The patent performs preliminary estimation of navigation data bits and generates SA data before the coherent integration process. By pre-generating the in-phase and quadrature components and estimating the navigation data structure, the system prepares all necessary elements for extended coherent integration in advance, enabling longer integration times without delaying the overall positioning calculation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The approach enhances GPS reception sensitivity by enabling longer coherent integration times, improving signal acquisition and tracking, and maintaining continuous position solution calculations in mobile-based GPS positioning.
Implementation Method 1
a correlator generates integrated samples by correlating a PRN code with the second RF signal and coherent-integrating the correlation result
Data Source
AI summary
An apparatus and method is provided for increasing GPS reception sensitivity in a mobile terminal having a mobile-based GPS positioning function. A GPS receiver in the mobile terminal generates SA data by using basic information about GPS satellites and system time. Here, the SA data is a replica of the total information bits of navigation data. The GPS receiver then correlates a PRN code with a GPS signal and coherent-integrating the correlation result by using the SA data. It calculates a position solution of the mobile terminal by using the integrated samples.