GNSS Receiver Interference Mitigation via Transmitter Signaling

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Solution Overview

Problem

The coexistence of GNSS and other wireless networking technologies in mobile devices is hindered by interference, leading to reliability issues due to out-of-band emissions and strong signals, which existing technologies struggle to mitigate effectively.

Innovation Solution

A system and method that utilize inter-technology signaling mechanisms to identify and control periods of interference, allowing the GNSS system to coordinate with wireless networking systems to reduce interference through the exchange of interference level signals and priority notifications, enabling reliable navigation signal reception.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a wireless transmitter operates simultaneously with a GNSS receiver in a mobile device, then wireless communication functionality is enabled, but interference is generated that degrades GNSS signal reception quality

Engineering Contradiction:

Improvewireless communication functionalityVSAvoidGNSS signal reception quality

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The system performs preliminary actions by having the wireless transmitter assert interference level signals before actual transmission occurs, and by having the GNSS receiver preemptively adjust its processing based on anticipated interference levels, preventing degradation before it happens

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback mechanisms where the wireless transmitter provides interference level information to the GNSS receiver, enabling the receiver to adapt its signal processing in real-time based on the current interference environment created by transmitter operations

Inventive Principle:

Principle #23Feedback

2Reliability

If interference mitigation techniques are implemented to protect GNSS reception, then navigation signal reliability improves, but system complexity increases

Engineering Contradiction:

Improvenavigation signal receptionVSAvoidinterference mitigation system

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system employs self-service mechanisms where the GNSS receiver autonomously adjusts its own signal processing parameters based on interference level signals from the transmitter, eliminating the need for complex external interference mitigation hardware or centralized control systems

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system changes operational parameters of the GNSS receiver (such as processing gains, filtering characteristics, or integration times) based on the interference level signals, allowing adaptive optimization without adding complex structural elements

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8456358B2Method for GNSS coexistence

Publication Date: 2013.06.04 TEXAS INSTRUMENTS INC

AI summary

A method for operating a wireless transmitter and a global navigation satellite (“GNSS”) receiver coexistent in a mobile wireless device. A mobile wireless device includes a GNSS receiver and a wireless networking system. The wireless networking system includes a wireless transmitter. The wireless transmitter provides a first interference level signal to the GNSS receiver. The first interference level signal indicates a level of interference that the GNSS receiver can expect due to operation of the transmitter. A priority signal is asserted if the processing of navigation signals in the GNSS receiver takes precedence over wireless transmitter transmissions.