1. Recently, his main area of research has been in airborne passive radars . 2. Passive radar depends upon the object sending a signal to the receiver.3. The new technology, called passive radar , watches signals from common cell phone transmissions. 4. :* Passive RADAR detects signals emitted or reflected off the plane from other sources. 5. Kh-31P passive radar seeker missiles are used as anti-radiation missiles. 6. In a passive radar system, there is no dedicated transmitter. 7. Brownstone believes China, Japan and Russia already have passive radar in various stages of development. 8. The radar system, nicknamed Kolchuga after the Russian word for chain-mail armor, is a so-called passive radar system. 9. Still, the passive radar technology is basically sound, said Nick Cook, an aerospace consultant for Jane's Defence Weekly. 10. The passive radar system has drawbacks.
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