5 ms·
I wonder what the normal or non-military use cases of this code could be? Planespotting? Indoor navigation?
by captainmuon 4y ago
I wonder what the normal or non-military use cases of this code could be? Planespotting? Indoor navigation?
- tinco 4y agoDrug smuggling. If you don't need to be covert then you could just use active radar, right?
- pkaeding 4y agoIf you have nothing to hide?
- masklinn 4y ago> If you don't need to be covert then you could just use active radar, right? Passive radars can be used to track emissions sources of which you have no specific knowledge e.g. you're looking for a ship or rig, but you either don't want to ping it, or you are looking for its rough location, or you literally don't have the hardware for an active radar at the range involved.
- krisoft 4y agoYou have a much more active imagination than I do. Others have linked the code and an article about someone trying it out. What you can do with this is that you wave around two yagi antenna. You point one at a broadcast source and an other at something flying in the opposite direction from the broadcast source. If all the stars align and the system works you then get the range, and the dopler. The measured range is the full distance from the broadcast source to the object and back to you. This is not a radar where the user gets a display full of tracks in front of them. One maybe one day might develop something like that from this core. Even if it were a stealth radar like that it is very dubious how it would help a drug smuggling operation, or why they would bother with it at all.
- nl 4y ago> What you can do with this is that you wave around two yagi antenna. You point one at a broadcast source and an other at something flying in the opposite direction from the broadcast source. If all the stars align and the system works you then get the range, and the dopler. This is one interpretation, but it's actually pretty reliable. > This is not a radar where the user gets a display full of tracks in front of them You actually do get a full radar plot. See the video at the bottom of https://www.rtl-sdr.com/krakensdr-field-reports-and-software-updates/ https://www.rtl-sdr.com/krakensdr-field-reports-and-software... for a complete tracking of a weather balloon.
- eskaytwo 4y agoThat was their original intent - to use the other receivers as well
- mkl95 4y agoTracking rogue drones maybe. Also stranded jets.
- angry_octet 4y agoTracking anything you might track with an active RADAR, but without needing a permit to operate a RADAR emitter. The ability to track 'stealth' aircraft is just a niche. Similar techniques are used to measure atmospheric density (for meteorology) using the known signals from GPS satellites.
- maltalex 4y agoI have the same question. Kraken's main product is a 400$ "software defined radio for applications such as radio direction finding and passive radar" [0]. At that price point they'd have to sell quite a few of these to make a living. So who's buying these, and what for? [0]: https://www.krakenrf.com/product-page/krakensdr https://www.krakenrf.com/product-page/krakensdr
- wl 4y agoI bought one to play around with. I've located radio transmitters by driving around and used the passive radar to track cars on a highway and airplanes at an airport.
- thakoppno 4y agoThere’s a decent group of amateur radio enthusiasts who buy these things to track illegal operators.
- fortran77 4y agoIt’s more done for sport. A low power beacon is purposely hidden somewhere and teams try to find it first.
- thakoppno 4y agoMy local club does foxhunting activities but also has been trying to identify a set of transmissions meant to disrupt the repeater’s operation. At least three members bought krakens at least in part to find the perpetrator. To me it’s a pretty interesting cat and mouse game. It seems like the illegal transmissions are mobile which has prevented success at stopping them.
- fortran77 4y agoAnother user case is non-malicious interference. Sometimes something is radiating a strong harmonic because of a corroded connector, etc, and the source can be identified with doppler direction finding equipment. Finding a culprit in a repeater war is a more difficult thing to do, because what do you do with the person once he's identified?
- amalcon 4y agoThe most often cited are things like the fire department figuring out which parts of a burning building have people in them, or a hospital noticing when a patient tries to get out of bed on their own.
- rapjr9 4y agoMaybe as a human presence detector for security, control of musical instruments, monitoring vital signs. In all those cases you probably don't want a radio emitter near other equipment (especially in a hospital). For security systems, say as a human presence detector, you may not want to advertise your security system has a radar sensor by broadcasting RF. I think there are some research papers on using passive radar for vital signs monitoring. Indoor localization would be a good use also.
- eskaytwo 4y agoA lot of those are based on wifi as the illuminator