I am trying to measure the Time of Arrival of a radio signal (CW) or the time I saw the signal on my graph. I will compare signal from different sources to see the dalay in arrival of the same signal from different sources. I wish to measure in Nanoseconds.
I will basically connect my DAQ to a radio to receiver this satellite signal.
Can anyone advice how I can measure the Time of arrival of the singal? Which module can I use. Labview has example modules. Which one fits my project?
If you read a Waveform from the DAQmx Read function, part of the waveform data typ is "T0" which is the timestamp of the first element in the waveform. Also in the waveform is "dt" which is the time for each sample. Based on those two, you can easily determine the time of a given sample. It is just a matter of figuring out which sample is the start of your signal. Usually a simple threshold check would work.