Delay generated offset - A direction sensitive pulse-coherent Doppler detection technique
Abstract
An offset-frequency (heterodyne) direction sensitive pulse-coherent Doppler detection method requiring a single digitally synthesized phase-shiftable oscillator and a single mixer is described. Less stringent demands are imposed on hardware in obtaining offset frequency stability and rejection of internally generated electrical clutter, as compared to the conventional offset method employing two oscillators. Simplification of hardware and post-detector signal processing as compared to the quadrature method (two parallel homodyne detectors) is anticipated. This technique has direct application in medical ultrasonics, and is generally applicable to sonar and radar systems.
- Publication:
-
10th Annual Asilomar Conference on Circuits, Systems, and Computers
- Pub Date:
- 1977
- Bibcode:
- 1977csyc.conf...78D
- Keywords:
-
- Coherent Radar;
- Digital Radar Systems;
- Pulse Doppler Radar;
- Radar Detection;
- Signal Processing;
- Time Lag;
- Angular Resolution;
- Frequency Stability;
- Harmonic Oscillators;
- Homodyne Reception;
- Mixers;
- Network Synthesis;
- Noise Reduction;
- Phase Shift Circuits;
- Signal Mixing;
- Electronics and Electrical Engineering