i need to process complex analog waveform for radar based applications.i need a suitable daq card for doing that task.please specify suitable card and application notes to perform dsp based applications.
The answer to your question depends largely on the sample rate, resolution, and number of channels you want to have. The first place I would look is the M Series devices at http://www.ni.com/dataacquisition/mseries.htm. Using LabVIEW, these analog input devices can read in a signal and easily perform an FFT on it.