Shared Resonator Frequency Correction for GNSS and RF Receivers
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Solution Overview
Problem
Conventional mobile devices with both GNSS and RF receivers incur increased cost and size due to the need for two separate temperature compensated oscillators.
Innovation Solution
A system where a GNSS receiver shares a resonator with an RF receiver, using a processor to compute and transmit frequency correction data based on temperature signals, allowing both receivers to correct their signals without separate oscillators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two separate temperature compensated oscillators are used for GNSS receiver and cellular modem, then frequency accuracy is maintained for both receivers, but device cost and size increase
Solution Approach 1:
The patent merges the frequency reference function into a single resonator that is shared by both the GNSS receiver and cellular modem. The resonator provides a common frequency reference that both receivers use, eliminating the need for separate temperature compensated oscillators while maintaining frequency accuracy through software-based correction algorithms that compensate for temperature variations.
Solution Approach 2:
The resonator is designed to serve multiple functions simultaneously - it acts as the frequency reference for both the GNSS receiver and the cellular modem. This multi-functional approach allows a single component to replace what would traditionally require two separate temperature compensated oscillators, reducing device complexity while maintaining the reliability needed for both receivers.
2Device complexity
If a shared resonator is used between GNSS receiver and RF receiver, then device cost and size are reduced, but frequency accuracy may deteriorate without correction
Solution Approach 1:
The patent implements feedback mechanisms where the GNSS receiver measures the actual frequency of the shared resonator and computes correction factors based on temperature sensor readings and frequency models. These correction factors are then applied by both the GNSS receiver and cellular modem to compensate for frequency drift, ensuring that frequency accuracy is maintained despite using a less expensive shared resonator.
Solution Approach 2:
The system dynamically adjusts frequency parameters by computing correction factors based on temperature changes and resonator characteristics. The processor monitors temperature signals from the sensor and uses frequency models to calculate real-time correction values, which are then applied to the resonator frequency output. This parameter adjustment approach allows the shared resonator to maintain the frequency accuracy previously requiring expensive temperature compensated oscillators.
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
This approach reduces manufacturing costs and increases frequency and time accuracy for both GNSS and RF signal reception, enhancing performance while minimizing hardware requirements.
Implementation Method 1
The processor receives a temperature signal from a temperature sensor that indicates an operating temperature of a resonator
Implementation Method 2
the processor computes a frequency and a frequency correction data of the resonator based on the temperature signal and a frequency model of the resonator
Data Source
AI summary
The present system relates to a GNSS receiver that includes a processor. The processor is configured to receive a temperature signal from a temperature sensor indicating an operating temperature of an resonator. The processor is also configured to compute a frequency and a frequency correction data of the resonator based on the temperature and a frequency model of the resonator. The processor then transmits the frequency correction data to an RF receiver which utilizes the frequency correction data and the resonator to receive and RF signal.