micro seconds matlab

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I search a function to calculate microseconds in a time istant using matlab.

Posted 25-May-11 23:36pm

paskah

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Sandeep Mewara 26-May-11 10:48am

And?

Sergey Alexandrovich Kryukov 26-May-11 15:30pm

Do not re-post!
--SA

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CPallini · Answer 1 · 2011-05-25T23:52:00

Solution 1

Your best bet would be providing a wrapper of QueryPerformanceCounter (see, for instance, http://support.microsoft.com/kb/172338[^]) in a shared library.
Anyway you should consider if such a requirement makes sense: after all you haven't a realtime OS.

Posted 25-May-11 23:52pm

CPallini

Updated 26-May-11 0:00am

v2

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paskah 26-May-11 7:38am

its can acces real time process?

CPallini 26-May-11 7:46am

What do you mean, exactly?

paskah 27-May-11 1:36am

i want to detected the distance an object moves, first step i must know about time when the signal was sent up to micro second precision, how matlab can retrieve the time in processor up to micro second, someone can help me to give me an example about the source code?

CPallini 27-May-11 4:39am

Is it a simulation or are you talking about real moving object? How do you measure position and time?

paskah 27-May-11 5:57am

its real moving object, im measure the position with radar system im detected the time delay when the signal trasmited and received an then im calculated with speed of light as fast as signal speed,from that im very need to know and can detected time when signal transmited and recived with microsecond precise.thanx

CPallini 27-May-11 6:03am

You should use the time provided by the measuring device, (i.e. the radar system), I suppose.

paskah 27-May-11 7:41am

It would, I am questioning how matlab can access time, if i can detected the time value when transmiting or receiving with microsecond precisely?

CPallini 27-May-11 8:05am

If the device provides the time info then you just have to access (see how this info is encoded). If you need PC accurate timings between packet reception then you should probably follow the QueryPerformance path (i.e. you must create a shared library exporting the function for matlab usage)