| 1. | Pulse-Doppler systems were first widely used on fighter aircraft starting in the 1960s.
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| 2. | The Doppler system is expected to change that by giving much more advance notice.
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| 3. | To distinguish targets from other reflections, it was necessary to use a phase-Doppler system.
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| 4. | This is a performance limitation for non-Doppler systems.
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| 5. | Modern Doppler systems are light enough for mobile ground surveillance associated with infantry and surface ships.
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| 6. | Doppler systems use fixed antennae, like BTDF, but handle the direction finding purely in signal processing.
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| 7. | The Doppler system can see wind hazards that are undetectable by conventional radar, and it can zero in on them.
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| 8. | However, lower PRFs introduce other problems, including poorer target painting and velocity ambiguity in Pulse-Doppler systems ( see below ).
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| 9. | They created circuits used by NASA and military space operations, including products used in the Doppler system for moon landings.
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| 10. | Doppler systems at D / FW Airport and Dallas Love Field are expected to be on line by late Summer 1995.
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