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1、.關(guān)于 GPS 冷啟動(dòng)、暖啟動(dòng)和熱啟動(dòng)的一種解釋GPS*器的啟動(dòng)時(shí)間是一個(gè)目前比較混亂,同時(shí)如果不具備一定的GPS 知識(shí)比較難以理解的一個(gè)概念。本文借助于外文的一些解釋,希望能夠用比較簡(jiǎn)單的語(yǔ)言讓GPS 愛(ài)好者們加深認(rèn)識(shí)。關(guān)于幾個(gè)啟動(dòng)時(shí)間的解釋也只是一家之言,大家還可以進(jìn)一步探討。GPS 的啟動(dòng)是一個(gè)比較有趣的話題,因?yàn)橥ㄟ^(guò)這個(gè)話題,可以作為深入了解GPS 專業(yè)知識(shí)的一個(gè)門徑。Hot Start - The GPS receiver remembers its last calculated position and which satellites werein view, the alma

2、nac used, and the UTC Time. It then performs a reset and attempts toacquire satellites and calculate a new position based upon the previous information. This isthe quickest re-acquisition of a GPS lock.熱啟動(dòng) -GPS*器保存有其最后計(jì)算的可視衛(wèi)星的位置、almanac(歷書 ) 和 UTC 時(shí)間,在重啟以后,GPS*器以保存的上述內(nèi)容為基礎(chǔ)獲取和計(jì)算當(dāng)前衛(wèi)星的最新位置。Warm Start -

3、 The GPS receiver remembers its last calculated position, almanac used, andknows the UTC Time, but not which satellites were in view. It then performs a reset andattempts to obtain the satellite signals and calculate a new position. The receiver has ageneral idea of which satellites to look for beca

4、use it knows its last position and the almanachelps identify which satellites are visible in the sky. This takes longer than a Hot Start but notas long as a Cold Start.暖啟動(dòng) -GPS*器保存有最后計(jì)算的衛(wèi)星的位置、歷書和UTC 時(shí)間,但保存的內(nèi)容不是當(dāng)前可視衛(wèi)星的數(shù)據(jù)。GPS*器重啟以后嘗試去獲得當(dāng)前衛(wèi)星和信號(hào)并計(jì)算其新位置。* 器基于其最后的位置和歷書得以大概知道當(dāng)前天空中的可視衛(wèi)星。;.Cold Start - The G

5、PS receiver dumps all information and resets. It then attempts to locatesatellites and then calculate a GPS lock. This takes the longest because there is no knowninformation. The GPS receiver has to attempt to lock a satellite signal from all of the satellites,basically like polling, which takes a l

6、ot longer than knowing which satellites to look for. Thisre-acquisition of a GPS lock takes the longest.冷啟動(dòng): GPS*器清空了所有歷史信息并重啟,然后它嘗試定位并鎖定衛(wèi)星,由于沒(méi)有先前信息,這將花去很長(zhǎng)的時(shí)間。 GPS*器采用類似于輪詢的方法,從所有的衛(wèi)星中鎖定信號(hào),這將比事前知道該搜索哪些衛(wèi)星要慢不少。這一類重新獲取鎖定要花最長(zhǎng)的時(shí)間。比較和小結(jié)熱啟動(dòng)就是啟動(dòng)時(shí)可視的衛(wèi)星信息和之前保存的信息是基本一致的。暖啟動(dòng)和熱啟動(dòng)的區(qū)別在于經(jīng)管也保存了之前的衛(wèi)星信息,可視搜星的時(shí)候可視衛(wèi)星(當(dāng)前衛(wèi)

7、星)并不是以前記憶的信息的衛(wèi)星,但是保存的歷史信息仍然有利于快速定位當(dāng)前衛(wèi)星。冷啟動(dòng),最好理解,就是在沒(méi)有歷史信息的情況下一個(gè)一個(gè)輪詢的方式搜星定位,所需時(shí)間最長(zhǎng)。關(guān)鍵名詞解釋:Almanac和 EphemerisThe satellites broadcast two types of data, Almanac and Ephemeris.Almanac data is course orbital parameters for all SVs. Each SV broadcasts Almanac data forALL SVs. This Almanac data is not ver

8、y precise and is considered valid for up to severalmonths.Almanac數(shù)據(jù)是反映所有衛(wèi)星狀況的比較粗略的軌道參數(shù),每一個(gè)衛(wèi)星都會(huì)廣播所有衛(wèi)星的Almanac數(shù)據(jù),這類數(shù)據(jù)不是十分精確,有效期長(zhǎng)達(dá)幾個(gè)月。Ephemeris data by comparison is very precise orbital and clock correction for each SV and isnecessary for precise positioning. EACH SV broadcasts ONLY its own Ephemeris

9、data. This;.data is valid for a period of time (maybe several hours) as determined by informationcontained in the broadcast. The Ephemeris data is broadcast by each SV every 30 seconds.Ephemeris數(shù)據(jù)相比之下是十分精確的軌道和時(shí)鐘糾正信息,每一顆衛(wèi)星只會(huì)廣播自己的Ephemeris數(shù)據(jù),這類數(shù)據(jù)的有效期或許有幾個(gè)小時(shí)(取決于廣播信息的包含的內(nèi)容)。Ephemeris數(shù)據(jù)每隔30 秒廣播一次。GPS 開機(jī)定位分為冷啟動(dòng)、溫啟動(dòng)和熱啟動(dòng)三種:冷啟動(dòng):以下幾種

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