The only thing that I found is that LRPT packets could contain APID 70 data which is satellite's onboard time. However I can't find very much info about APT/LRPT protocols. recorded with GQRX and then processes in Audacity) contains some timestamps (or may be GPS coordinates) and smart programs like WXtoIMG are possible to process this hidden metadata together with TLE data and draw geo objects in overlay. The same functionality exists in WXtoIMG software and it works only if you have updated Keplers list. More specifically I want to add possibility to overlay geographical data such as land borders, administrative borders, rivers etc on the resulting images after rectification. I want to extend functionality of some open-source programs which decode APT and LRPT images (wxapt and glrpt).
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