32-bit systems based on multimedia car navigation system

1. Introduction

Car multimedia navigation system, is in the automotive environment, able to work independently of the multimedia systems and navigation systems. Relative to the handheld personal navigation products (PND), and performance products on the environment has a much higher requirements.

First is the work of environmental temperature problem, the car is a mechanical extension of the human body, is a mobile coat, its work temperature, from minus 4,50 ℃ in winter, to zero on the 7-80 ℃ in the desert, Gobi Desert, device in which the products need to adapt to such a requirement, more than the work of environmental standards for industrial products.

In general, consistent with auto-loading of electronic products, our work will be required temperature -30 ℃ to +85 ℃ within.

Meanwhile, the car, because of ignition systems, power generation systems, the electromagnetic environment is extremely bad for the earth to receive very weak signals of the navigation positioning satellite systems, against electromagnetic interference, to achieve an appropriate and stable performance, the difficulty is you can imagine.

And vibration requirements of the product, but also a very specific automotive environment indicators, in which the use of components, connectors, display screen, etc., all need to meet the requirements of the anti-vibration performance.

Other things like salt, moisture, oil and other environmental factors, automotive products, household and need to be able to exceed the requirements of general industrial products.

And even this harsh environment, the reliability requirements of automotive products still need to keep on top of a fairly level, in designing the system, we need reliability, availability, to be human nature, to spend compared with other consumer and industrial products many times more energy and time.

An automotive products, after the completion of the design, application to enter the car, to go through a very lengthy and complex testing p