: PS:毕竟SirFIII也出来够久了, MTK GPS的晶片较新,制程可以较先进, : 本来效能就该比较好,联发科的晶片GPS在台湾卖,就算是效能较好且更省电. : MTK GPS 最大优点为较旧一代 0.13um 制程的 SiRFstarIII 省电. 最大弱点 : 为在讯号不佳情况下搜寻卫星速度慢; 树下或市区冷开机或暖开机立可见得. : 由於省电廉价与高感度, 采联发科 GPS 晶片之产品对大部分消费者应用已够用. : 若应用环境多半是在像收讯不良高楼林立的台北市, 开机想早点定位的话, : SiRFstarIII 产品还是上选 *[1;37m推 *[33msklx*[m*[33m:定位速度其实是蛮大的关键... *[1;37m推 *[33mCandyWind*[m*[33m:目前Q818和M1000的官方规格，更新时间都为0.1s *[1;31m→ *[33mCandyWind*[m*[33m:个人实测M1000市区冷热开机都比GR236还快，虽然没 *[1;31m→ *[33mCandyWind*[m*[33m:而且大部份都是M1000有效卫星较多，并无定位不易?*[1;37m推 *[33mujj*[m*[33m:结论 台湾还是用SIRF3较适合 ? *[1;37m推 *[33mdodow8889*[m*[33m:可是看楼上C大的使用心得感觉又不错~可能要等多点 *[1;31m→ *[33mdodow8889*[m*[33m:得才能比较了..不过倒是希望台湾自家产品能更进步 *[1;31m→ *[33mdodow8889*[m*[33m:的绝对是消费者..毕竟价格能压下来...^__^ 小弟回这篇不是想造成争论，只是觉得有些部份与实测有差， 不然像我这种最底层的user应该只有使用的份。 其实我会考虑到MTK晶片的gps也是因看到mobile01『谜样的晶片....』一文， 所以一直在BT338和Q818犹豫不决，毕竟Q818我连代理商都没听过， 不过後来考量品牌价位和01的网友的使用经验，所以选Holux的产品。 爬过的文： http://www.gpspassion.com/forumsen/topic.asp?TOPIC_ID=67511 这篇主要可以看到MTK轨迹非常稳定。 第一张巴黎街道：In dowtown Paris a sharp turn on the right on a fairly wide boulevard generates a strong multipath reaction on the SiRFstarIII receivers with the Nemerix NJ1030 v4, uBlox doing better but the best performance comes from the MTK chipset that is spot on 第二张圆环：Going round a roundabout under various underpasses, irregular tracks except on the Nemerix and MTK based receivers http://0rz.tw/8a2J1 这篇可以看到MTK定位迅速 For my test of the unit, I first of all gave it a thorough charge, and then powered it up and placed it on the office window sill. At this point I expected it to take a while to get a fix (as is customary in a 'cold start' scenario), but immediately, the BT-Q810 started to shine. The device actually found a good quality fix before my SiRF III unit had, which astounded me - I was up and running in around 30 seconds. http://www19.discuss.com.hk/viewthread.php?tid=3586148 这篇是香港的，路测还蛮详细的。 http://www.pocketpcreviews.net/content/view/47/67/ 这篇介绍到MTK的高敏感度，不输Sirf3，可能甚至超越在-158db时 The Qstarz uses the MTK chipset which is possibly even more sensitive (rated at -158dBm) than the SiRFstarIII and in static tests around the office this was proven by excellent reception results, even metres from the nearest window. Have a look at this screenshot which shows that we are still pulling in eight satellites while 5 m away from the nearest window ‧ Great sensitivity -- on a par or better than the SiRFstarIII at -158dBm -------------------------------------------------------- ps.值得一提的是官方规格上MTK -158dbm的敏感度可能没有Sirf3 -159dbm还漂亮， 但在上面实测好像也都没输掉，但最特别的应该是MTK晶片有很好的追踪能力，窗边 定位後拿到距离窗边几公尺都还有很有机会定位到，所以进出隧道或高楼、高架桥等 暂时遮蔽的区域受到的影响会相对的减少。 以上是小弟之前爬文跟小小实测的心得，thanks --

※ 发信站: 批踢踢实业坊(ptt.cc) ◆ From: 59.104.43.14