Software defined lighning detector?
I was recently looking at how lighning detectors work. Mainly they compare S-meter spikes to a threshold level in a small band around 500KHz. This works but with problems due to local RFI which can confuse things. It occurred to me that I can tell very easily looking at a waterfall when lighning makes a brief hit to the noise floor which spans more than a decade of frequency. That means that software looking at signal levels on several frequency diverse filters and detecting via a time correlation between events across the filters placed in different parts of the lower HF spectrum would probably be a more reliable and robust way of detecting. If one of the filters happens to fall on a strong local RFI source then the time correlated detection subtractis it out so to speak. Software can also be smart and make use of known quantities such as variations in D-layer adsorbiton in day/night. Software knows time of day and GPS informed software knows sunset/sunrise so all of this data can probably get a much more informed idea of how close lightning stikes are. Could a KiwiSDR extension be a good platform for such a technique? Comments invitied.