GPS芯片的省電功能，模塊延長(zhǎng)手機(jī)應(yīng)用中的電池壽命

　　GPS功能已成為個(gè)人移動(dòng)設(shè)備的基本要求。對(duì)于工程師來(lái)說(shuō)，確保延長(zhǎng)電池壽命的需要可能與要求連續(xù)GPS定位的應(yīng)用程序要求相沖突。通過(guò)采用節(jié)能策略，工程師可以在移動(dòng)設(shè)備上增加先進(jìn)的GPS能力。作為這種方法的基礎(chǔ)上，工程師們可以使用各種低功耗工作模式從Skyworks和集成產(chǎn)品和安諾亞，Linx技術(shù)，膜技術(shù)，臺(tái)喲宇扥GPS模塊GPS芯片，和高。

　　在手機(jī)等個(gè)人移動(dòng)設(shè)備中，GPS操作可以消耗與顯示器一樣大的功率。因此，GPS電路的有效功率管理可以對(duì)整個(gè)系統(tǒng)的電池壽命產(chǎn)生重大影響。雖然應(yīng)用需求將在很大程度上驅(qū)動(dòng)GPS功率保護(hù)的有效限制，工程師們可以在初始GPS定位和GPS靜止?fàn)顟B(tài)下對(duì)功耗進(jìn)行相當(dāng)大的控制。

　　In order to establish an initial GPS fix， GPS devices require almanac data， ephemeris data， and satellite fixes. Ephemeris data provides the current date and time as well as satellite health data and typically can be acquired in 30 to 120 sec. Almanac data provides information on satellite location throughout the day and is the most costly to update in standalone GPS systems， requiring several minutes to download at the 50 bps rate available for satellite downloads. Assisted GPS， or A-GPS， methods can use local wireless connectivity to access the Internet to download almanac data orders of magnitude faster than direct satellite downloads.