Czech Passive Radar Detecting B-2 at 150 miles (2015)

Post by DarkmSparks » Sun, Mar 15, 2020, 2:52 AM UTC

blago wrote: post #100

DarkmSparks wrote: post #97

Earlier quoted context omitted.

And even that says: Some American sources state that a second F-117A was damaged during the same campaign, allegedly on 30 April 1999;[61] the aircraft returned to base, but it supposedly never flew again.[62][63] Point is with AA missile is that getting them "on target" is almost as effective as a hit. target has to deploy its counter measures and return home, else next time they are destroyed.

I was addressing the dubious choice of sources delivered with arrogance and condescension. Couldn't care less about how many airplanes did Serbia take down.

Post by BlindWanderer » Sun, Mar 15, 2020, 4:11 AM UTC

imglorp wrote: post #50

ChuckMcM wrote: post #26

Hmm, not your typical RADAR. This is basically using the RF emissions of the plane, and their detection at multiple RF detection stations with synchronized clocks, to determine the difference in arrival time. The radio emissions all travel at the same speed through the air, the difference in arrival time can be used with some simple trig to figure out where the RF emitter is. There are a number of Time Difference of…

> they are "easy" to jam in the sense that when you have two radio signals on the same frequency, they will interfere with direction finding Nope, it's a more sophisticated algorithm they're using. Our company held all the patents for locating GSM cell phones calling 911 using UTDOA. The U is uplink, meaning the network of receivers listens when the phone talks. The patents entail each receiver taking a sample of the…

Post by yutyut » Sun, Mar 15, 2020, 7:04 AM UTC

rtkwe wrote: post #94

ummonk wrote: post #61

Earlier quoted context omitted.

Yup, it seems to me that the optimal missile would use mid-course guidance before doing IR / visual light homing in the terminal phase.

All the stealth craft also included some IR avoidance as a matter of course, IR seeking missiles existed at the time these were designed. It's unclear if a more modern missile would still be sensitive enough to lock on and avoid chasing flares. The techniques they used to decrease the IR visibility are pretty neat. The engine nozzles are over the wings and there are a lot of airflow tricks used to cool it down faster…

Post by fulafel » Sun, Mar 15, 2020, 7:20 AM UTC

sfifs wrote: post #58

JDulin wrote: post #47

Earlier quoted context omitted.

More to the point, detecting a stealth aircraft is very different from shooting at a stealth aircraft. This radar would likely not have the location accuracy of where exactly the B-2 was to accurately engage it with a missile. Your accuracy would be limited by the rate of RF pings the B-2 is putting off, and then the margin-of-error of these RF waves and receiver. This is one difference between the B-2 and stealth fi…

If you can localize down to the range of a km? Can't you just shoot down optically? A giant dark plane blotting out the stars...

Post by nnq » Sun, Mar 15, 2020, 10:20 AM UTC

lazyjones wrote: post #7

What would air defence against a swarm of a few 1000 UAV look like? Because China...