Linx公司的SG系列GPS接收器模塊采用SiRFstar III芯片組,是集成了LNA和SAW濾波器的高性能GPS接收器,即使在濃密的樹林或城市高樓大廈間也具有極好的靈敏度(-159dBm).SG系列的功耗很低(46mW),有200,000多個高效的相關(guān)器,能同時在一秒內(nèi)收集和跟蹤20個衛(wèi)星,廣泛應(yīng)用在導(dǎo)航和定位與跟蹤,安全/防盜,測量,后勤和艦隊管理等.本文介紹了SG系列GPS接收器模塊的主要特性,和MCU連接框圖以及應(yīng)用電路圖。

The SG Series GPS receiver module is a selfcontained high-performance GPS receiver with an on-board LNA and SAW filter. Based on the SiRFstar III chipset, it provides exceptional sensitivity, even in dense foliage and urban canyons. The module’s very low power consumption helps maximize runtimes in battery powered applications. With over 200,000 effective correlators, the SG Series receiver can acquire and track up to 20 satellites simultaneously in just seconds, even at the lowest signal levels.

Housed in a compact reflow-compatible SMD package, the receiver requires no programming or additional RF components (except an antenna) to form a complete GPS solution. These features, along with the module’s standard NMEA data output, make the SG Series easy to integrate, even by engineers without previous RF or GPS experience.

SG系列GPS模塊主要特性:

SiRF Star III chipset

200,000+ correlators

Low power consumption (46mW)

High sensitivity (-159dBm)

20 channels

Fast TTFF at low signal levels

Battery-backed SRAM

No programming necessary

No external RF components needed (except an antenna)

No production tuning

Direct serial interface

Power down feature

Compact surface-mount package

Manual or reflow compatible

RoHS compliant

SG系列GPS模塊應(yīng)用:

Positioning and Navigation

Location and Tracking

Security/Loss-Prevention

Surveying

Logistics

Fleet Management

圖1.帶無源天線的SG系列GPS模塊

圖2.帶有源天線的SG系列GPS模塊

The Linx SG Series RF modules offer a simple, efficient, and cost-effective method of adding GPS capabilities to any product. The Master Development System is intended to give a designer all the tools necessary to correctly incorporate the SG Series into an end product. The development boards themselves serve several important functions:

Rapid Module Evaluation - The boards allow the performance of the Linx SG Series modules to be evaluated quickly in a user’s environment.

Design Benchmark - During the design process of your product, the boards provide a known benchmark against which the performance of your own design may be judged.

Application Development - An on-board prototyping area is provided to allow a designer to develop applications directly on the development board. All signal lines are available on a header for easy connection to the designer’s circuits. The Master Development System includes 1 assembled development board, 2 SG Series receivers*, one SH Series antenna, 4 AAA batteries, and full documentation.

圖3.SG系列GPS模塊開發(fā)板外形圖

1. Four AAA Batteries

2. DC Power Jack

3. Power Switch

4. Voltage Regulator

5. USB Interface Module

6. Prototype Area

7. Break-Out Header

8. SG Series Receiver Daughter Board

9. CR2032 Backup Battery (on the back)

10. OLED Display

11. OLED Display Power Switch

圖4. SG系列GPS模塊應(yīng)用電路圖