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From: | Marcus D. Leech |
Subject: | Re: [Discuss-gnuradio] File sink: file size |
Date: | Fri, 07 Apr 2017 22:16:06 -0400 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 |
On 04/07/2017 02:53 PM, Ellie White
wrote:
You might also take a look at my work from 6 or 7 years ago: https://github.com/patchvonbraun/SIDSuite It uses audio input. It uses a set of Gortzel transforms to pick out the channels of interest. But there are other approaches, using an FFT as you have. Since the things that you're looking for unfold over timescales of many-seconds to many-minutes, you don't need to be logging your FFT output in real-time. You could easily integrate for several seconds and dump output data at a lower rate, using keep-one-in-N. At an input rate of 2Msps, your 1024-point FFT will be producing 1953 1024-bin vectors/second. This is *much* faster than the timescale of ionospheric events, in my experience. Also, your frequency resolution will be somewhat coarse-1953Hz. This is much wider bandwidth than the naval stations you're looking at, so you'll mostly be integrating noise, rather than navy signal, in your bins. |
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