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ST20-GP1

GPS PROCESSOR

STMicroelectronics 

ST20-GP1

1 Introduction

The ST20-GP1 is an application-specific single chip micro using the ST20 CPU with

microprocessor style peripherals added on-chip. It incorporates DSP hardware for processing the

signals from GPS (Global Positioning System) satellites.

The twelve channel GPS correlation DSP hardware is designed to handle twelve satellites, two of

which can be initialized to support the RTCA-SC159 specification for WAAS (Wide Area

Augmentation Service) and EGNOS (European Geostationary Navigation Overlay System)

services.

The ST20-GP1 has been designed to minimize system costs and reduce the complexity of GPS

systems. It offers all hardware DSP and microprocessor functions on one chip. Whilst the entire

analogue section, RF and clock generation are available on a companion chip. Thus, with the

addition of a ROM and a RAM chip, a complete GPS system is possible using just four chips, see

Figure 1.1.

Antenna

ST20-GP1

Radio

Single chip

DSP

ASIC

Low

cost

crystal

No TCXO

CPU

Watchdog

timer

UART

Real

time

clock

Driver

(optional)

Parallel I/O

ROM

RAM

Figure 1.1 GPS system

The ST20-GP1 supports large values of frequency offset, allowing the use of a very low cost

oscillator, thus saving the cost of a Temperature Controlled Crystal Oscillator (TCXO).

The CPU and software have access to the part-processed signal to enable accelerated acquisition

time.

The ST20-GP1 can implement the GPS digital signal processing algorithms using less than 50% of

the available CPU processing power. This leaves the rest available for integrating OEM application

functions such as route-finding, map display and telemetry. A hardware microkernel in the ST20

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