Hello,
I'm new at signal processing and was wondering if there's any new innovative methods in detect very weak signals over noise. Signal example less noise ->
The signal lasts about 1/2 ms and a fraction of a uV. Noise could possible be hundreds times greater than signal. One advantage is the circuit controls exactly when the signal fires. So at least the circuitry knows exactly when to detect the signal. I would like to limit the sampling time to 0.5 second.
The input coil is 3.5" dia., 3.5" tall, 1000 turns of 24G, 23 ohms. I calculate 60mH and guessing at about 8000 pF.
Perhaps a common 1st stage would be a low noise op-amp followed by some filtering-- perhaps an Elliptic filter is good at filtering out high end ->
http://www.ortodoxism.ro/datasheets/lineartechnology/10696f.pdf Perhaps a PLL would make a good 3rd stage. I'm wondering if there are any other methods. Not sure if DSP could work since the STN is broad unless we're talking about a 24 bit ADC-- sounds like a lot of bits to me.
Thanks, Paul