Development of portable navigation combination unit
Yukisuke Ozaki Takuya Watanabe Atsushi Fujita Yasushi Tsuji Hiroshi Koutari Tomoyuki Hamabe

Abstract

Fujitsu Ten released the world's first AVN and created a new market centering on Japan. Meanwhile, from a global viewpoint, PND (portable) has become widely used in countries other than Japan. When considering the characteristics of the overseas market, we perceived the possibility of a new market incorporating the element of PND, as well as conventional AVN, and so we planned and developed the portable navigation combination unit. We introduced this product in January 2007, and released it also in Europe and Australia, starting with release in North America as an ECLIPSE product in May of the same year. Furthermore, we have started to deliver the same model to Toyota Europe and the product has attracted a great deal of attention as a new-category product in car navigations. In this article, we introduce the concept / summary of product, hardware / software technology and implementation method.

Introduction

2.2 Product Concept
Project Background and Development Objectives

2.1 Market Trends

FUJITSU TEN TECH. J. No.30(2008)
FUJITSU TEN TECHNICHAL JOURNAL

2.3 Project Objectives

3.2 System Architecture

System Overview

3.1 Introduction of Features
PND Detachment/Attachment Technology
4.1 Development Objectives
4.2 PND Detachment/Attachment Mechanism
4.3 Measures for Meeting Design Objectives and Results
4.3.1 Structural Design for Easy Detachment
4.3.2 Inclination Angle Range

Electrical Interface

5.1 Interface
Communication signals between main audio unit and PND Sound signals Power supply lines GPS signals (including GPS signal shield GND line/cable) Other signals
5.2 Factors Affecting Design for Each Signal
4.3.3 Vibration Countermeasure 5.2.1 Communications Between Audio Unit and PND

5.2.2 Sound Signal

5.2.3 Power Supply Signal

5.2.4 GPS Signal

Software Development
6.3 Communication Speed Issues
6.1 Selecting a Communication Method

6.2 Data Structure

Time required for interrupt process < Time required for data transmission/reception of UART communication + Load time

6.5 Development Issues

6.5.1 Overview of the PC Simulator
6.4 Collaborative Development with TomTom

[Activities]

Examine the contents of the data transmitted from audio unit to PND Compose and send pseudo commands to the audio unit Monitor the state of communication between the audio unit and PND 6.5.2 Functions and Features of Simulator [Functions] Command transmission
Command reception [Results] Data storage

Data editing

[Features]
Automatic ACK/NAK response

Conclusion

Retry upon failure of transmission

Byte stuffing

Profiles of Writers

Yukisuke Ozaki

Entered the company in 2004. Since then, has engaged in product planning of ECLIPSE audio navigation. Currently in the Planning Department 2 of Products Planning Division, CI Group.

Takuya Watanabe

Entered the company in 1984. Since 2005, has engaged in structure development of audio navigation by way of structure development of automotive electronic equipment, and elemental technology development of heat release / waterproof. Currently in the Mechanical Engineering Department, CI Group.

Atsushi Fujita

Entered the company in 2003. Since then, has engaged in development of audio software. Currently in the Software Engineering Department of Engineering Division, Software Engineering Group.

Yasushi Tsuji

Entered the company in 1998. Since then, has engaged in development of multimedia device (MONET, navigation, display product). Currently in the System Integration Department 2 of System Engineering Division, Software Engineering Group.

Hiroshi Koutari

Entered the company in 1993. Since then, has engaged in circuit design of audio product. Currently in the Global OEM Engineering Department of Engineering Division 2, CI Group.

Tomoyuki Hamabe

Entered the company in 1991. Since then, has engaged in circuit design of audio product. Currently the Manager of the Global OEM Engineering Department of Engineering Division 2, CI Group.