Range-Doppler imaging - Waveforms and receiver design
Abstract
Receiver and signal processing issues associated with three specific coherent waveform types for a heterodyne detection range-Doppler laser radar are considered. The waveform types are simple unmodulated pulse trains, linear frequency modulated (LFM) chirp pulse trains, and biphase shift-keyed pulse trains. Optimal receiver filters are derived in terms of the waveform complex signal envelopes by maximizing the SNR in the strong local oscillator signal case. Relationships between the target spin rate and the waveform parameters for unambiguous range-Doppler imaging are presented. The best possible crossrange resolution is also established in terms of the target and waveform parameters. The radar ambiguity function is used to establish a relative performance comparison of the waveform types. Two receiver block diagrams are presented: one for processing the LFM chirp pulse train waveform and another which can be used for a wide variety of pulse train waveforms.
- Publication:
-
Laser radar III
- Pub Date:
- June 1989
- DOI:
- Bibcode:
- 1989SPIE..999..138K
- Keywords:
-
- Doppler Radar;
- Optical Heterodyning;
- Optical Radar;
- Radar Imagery;
- Bandpass Filters;
- Chirp Signals;
- Frequency Modulation;
- Phase Shift Keying;
- Signal To Noise Ratios;
- Waveforms;
- Communications and Radar