All aircraft seem to be transmitting a ICAO24 identifier in which military larger aircraft do transmit but sometimes they transmit position sometimes no. Sometimes they transmit a cal sign and sometimes no. Using software decoders on your ADS-B receiver you look up ICAO24 displayed and find out what it is. Positional data is voluntary for the military. As far as civil, I am not sure about the choice.So if they can't be tracked with SSR does civilian use primary radar I guess to coordinate aircraft from running into one another? Like when the Blue Angels come out here how do civial operators know where they are? Since they don't use ADS-B how would an F-18 show up on TCAS?
You don't suppose a military aircraft, or civilian for that matter, would have the ability to shut off an IFF system? Or the system might have a selective ability to respond?So an ATC radar site will have an IFF interrogator that constantly transmits to integrate military aircraft? Is IFF on 1030 MHz as well?
How does the F-22 Raptor or anly other jet for that matter use this IFF? I know the signal is encrypted but couldn't the mere fact that there is a RF signal be sent would indicate where the jet is at to the enemy?
Edit- I think I just figured it out. The ping is so fast that by the time the enemy sees a blip of RF energy the friendly is far away from that position. But that still gives away an approximate position, doesn't it?
It can still be tracked, as it is still a transmission.
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Also, for military apps, DSSS appears as 'noise' on a spectrum. Narrow band interferers, and signals can clearly be seen on a scope, as a 'spike'. DSSS simply increases the noise level by a small amount, meaning the 'enemy' does not even know someone is transmitting.
Be careful with the term “near field”, it has a very specific meaning in the world of RF and no, you do not have to be anywhere near the near field to receive FHSS, or DSSS for that matter.Don't you need a near field receiver to be able to even get a signal? After all the squawk code would be spread over several frequencies in a second. I read something on Wikipedia about NATO wanting to use FHSS, but the plan fell through I guess.I can't find where I read that.
After reading this perhaps DSSS is the way to go.
ESM = Electronic Support Measures.What does ESM stand for? Wikipedia doesn't seem to have it.