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It's called a passive radar, but it does not receive radar signals. Unless Hensoldt lied and ran a normal radar along, of course. Strictly speaking, though, the passive radar is as incapable of receiving radar signals as a clock radio is capable of receiving sattelite phone calls. They work with totally different frequencies.
And their press release suggests that Hensoldt merely used ADS-B transponders to cross-check whether or not the aircraft they were tracking where indeed the F-35's. That's hardly surprising, considering the congested airspace the flights took place in. Besides, the objections posted in that article seem to ignore the distinct possibility to extrapolate a stealth jet's position through the use of both passive radar and conventional air defence radars.
A signal received by one but not the other should be worth looking at, right?
And their press release suggests that Hensoldt merely used ADS-B transponders to cross-check whether or not the aircraft they were tracking where indeed the F-35's. That's hardly surprising, considering the congested airspace the flights took place in. Besides, the objections posted in that article seem to ignore the distinct possibility to extrapolate a stealth jet's position through the use of both passive radar and conventional air defence radars.
A signal received by one but not the other should be worth looking at, right?
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