Coherent MM Wave Radar Using Incoherent Transmitter
NAVAL RESEARCH LAB WASHINGTON DC
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A breadboard of a current mm wave radar using an incoherent transmitter was designed and tested. As transmitter was used an Extended Interaction Oscillator operating at 94 GHz with 1 kW pulse output power. The pulse peak to clutter ratio behind the synchronous detector was measured to be 26 dB for single pulse. It appears that this ratio was limited by phase noise performance in the receiver local oscillator and the target simulator and other circuitry rather than the EIO itself. The scheme of an IF Coherent Radar is not new. However, it appeared that the mm wave Extended Interaction Power Pulse Oscillator EIO, due to its frequency stability, would work successfully with such a scheme. It is necessary that the phase within the r.f pulse is linear with time during the pulse, i.e., there is no chirp or random noise in the phase of the r.f. pulse. As our measurement shows, this is true to a large extent with the EIO we used in the setup described in this report.
- Electrical and Electronic Equipment
- Active and Passive Radar Detection and Equipment