05-01-2012, 19:36
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חבר מתאריך: 08.12.11
הודעות: 626
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עדכונים
הסינים הכריזו על מערכת הניווט הלוויני ביידו ("הדובה הגדולה") כפעילה
ציטוט:
[התמונה הבאה מגיעה מקישור שלא מתחיל ב https ולכן לא הוטמעה בדף כדי לשמור על https תקין: http://www.geek.com/wp-content/uploads/2011/12/Screen-Shot-2011-12-29-at-5.09.48-PM-580x99.png]
Beidou, which translates to “Big Dipper”, will cover the southern Asia for the time being, but will expand outward to be a worldwide navigation system by 2020. At this point it’s composed of 10 satellites, out of a planned total of 35. For reference, the US’ GPS is an array of 32 satellites (at least 24 of which are always operational). At a given time a connection with four satellites is necessary in order to get accurate location data, and more satellites means benefits like better worldwide coverage and faster signal acquisition. The Russian equivalent, GLONASS, has 24 satellites.
Work on Beidou began in 2000, which is quite late compared to the US, but development is happening quickly right now. By the end of 2012 China plans to have six more satellites in the array, bring the total up to 16. The current system, according to a BBC report, is accurate to 10m, which is rather poor compared to that of the US, but it should improve as the number of satellites grows
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http://www.geek.com/articles/mobile...ional-20111230/
http://www.bbc.co.uk/news/technology-16337648
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חברת קוואלקום - יצרנית רכיבים לטלפונים סלולריים - הודיעה כי במהלך 2012 תספק שבבי ניווט מבוססי גלונאסס הרוסית בונוסף על לוויני הג'י.פי.אס האמריקאיים
ציטוט:
[התמונה הבאה מגיעה מקישור שלא מתחיל ב https ולכן לא הוטמעה בדף כדי לשמור על https תקין: http://www9.pcmag.com/media/images/316573-qualcomm-glonass-phone.jpg?thumb=y]
Some time in 2012 Qualcomm will start to release chips capable of using GLONASS. This means, when combined with the GPS system, more satellites will be within reach of your device at a given time. More satellites clustered within range means more accurate location detection and less problems with typical sat-nav hurdles, like negotiating with urban canyons.
And the best part? Connection with GLONASS is free and not particularly difficult to utilize. A different radio is required so current handsets will not be upgradeable, but once Qualcomm starts releasing these chips it could be a standard feature in high-end devices if demand is sufficient and the cost/benefit analysis makes sense. To date relatively few GPS devices utilize GLONASS, but Qualcomm’s ubiquity could change that for phones, especially if it caused competitors, like Broadcom, to do the same
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