Dual Navigation Module Boot-Up Dead Reckoning

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Solution Overview

Problem

Conventional navigation systems face reliability issues during boot-up as they are occupied with loading the operating system and initializing hardware, leading to unreliable location and heading estimation due to unavailability of GPS data during this time.

Innovation Solution

A navigation system with a first module that performs initial boot-up tasks and a second module that performs dead reckoning during this time, communicating the calculated data to the first module once it is operational, allowing for more reliable location and heading estimation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the navigation module performs boot-up tasks (loading operating system, initializing hardware), then the system can become operational, but GPS location and heading become unavailable during this period

Engineering Contradiction:

Improvenavigation solution reliabilityVSAvoidboot-up time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by having the second navigation module perform dead reckoning computations in advance during the boot-up period when the first module is occupied. This allows the system to maintain location and heading estimates without waiting for GPS data or the main module to become operational, thereby resolving the contradiction between system initialization and navigation availability

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the navigation device uses conventional single-module architecture, then the device structure is simple, but the navigation estimation is unreliable during occupied periods

Engineering Contradiction:

Improvelocation and heading estimation reliabilityVSAvoidnavigation module structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the navigation system into two distinct modules: a first navigation module for primary navigation computations and a second navigation module for dead reckoning during occupied periods. This segmentation allows each module to specialize in specific functions, improving overall reliability while maintaining manageable system complexity through clear functional separation

Inventive Principle:

Principle #1Segmentation

3Ease of operation

If the navigation module is occupied with loading and initialization tasks, then the system can become operational, but dead-reckoning functions cannot be performed

Engineering Contradiction:

Improvecontinuous navigation capabilityVSAvoidnavigation module structure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent applies multi-functionality by designing the second navigation module to specifically handle dead reckoning functions that cannot be performed during boot-up. This allows the system to maintain continuous navigation capability across different operational states, with each module optimized for its specific function while working together to provide comprehensive navigation coverage

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS7788025B2Navigation system

Publication Date: 2010.08.31 CONTINENTAL AUTOMOTIVE SYSTEMS INC

AI summary

A navigation system includes a first navigation module having a first operational state wherein the first navigation module does not estimate a current location and a second operational state wherein the first navigation module estimates the current location. A second navigation module performs dead reckoning in response to the first operational state of the first navigation module.