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--- sensors:gnss:synchronized [2012/11/06 17:17]
karina
+++ sensors:gnss:synchronized [2021/08/14 04:21] (current)
@@ Line 1: / Line 1: @@
 ==== Synchronized RTK mode ====
-Precise time reference — Many systems that must be accurately synchronized use GNSS as a source of accurate time. GNSS can be used as a reference clock for time code generators or Network Time Protocol (NTP) time servers. Sensors (for seismology or other monitoring application), can use GNSS as a precise time source, so events may be timed accurately. Time division multiple access (TDMA) communications networks often rely on this precise timing to synchronize RF generating equipment, network equipment, and multiplexers. (from [[http://en.wikipedia.org/wiki/GNSS_applications]])
+Very precise position reference, but only 1 hz output.
+== From: "BD950™ - Reference Manual": ==
+[[http://www.scribd.com/doc/91055018/19/Fast-Update-Synchronized-RTK-5-or-10-Hz]]\\
+Synchronized RTK is the most widely used technique to achieve centimeter-level position estimates between a fixed base station and a roving receiver. Typically, the update rate for Synchronized RTK is once per second (1Hz). With Synchronized RTK, the rover receiver must wait until the base station measurements are received before computing a baseline vector. The latency of the synchronized position fixes is dominated by the data link delay (see Figure2.1). Given a 4800 baud data link, the latency of the Synchronized RTK fixes will approach 0.5 seconds. The solution latency could be reduced by using a 9600 baud or higher bandwidth data link.\\
+The Synchronized RTK solution yields the highest precision possible and suits low dynamic applications such as human-mounted guidance. Airborne applications such as photogrammetry, or aircraft landing system calibration, demand update rates in excess of 1 Hz, to sample the platform trajectory.
+{{ :sensors:gnss:figure2_1.png?300 |Figure 2.1 Factors contributing to RTK latency}}

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