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- W52003716 abstract "A range imaging laser radar using gallium arsenide (GaAs) laser technology has been developed. An image is constructed by scanning the beam in two dimensions over the scene. Our development system transmits an intensity modulated laser beam and determines range by measuring the phase difference of the local oscillator to that of the return signal. Since a 1GHz clock is used to measure this phase difference a theoretical maximum of 1 nsec., or six inches, of range change can be resolved. An amplifier is required to convert the received signal, of wide dynamic range, into a digital waveform for the counter circuit. To obtain the highest possible system resolution this amplifier must impart a minimum amount of phase shift over the dynamic range of the received signal. To maintain a high signal to noise ratio the amplifier must have a narrow bandwidth. Three approaches to the design of an appropriate signal amplifier were explored. A diode clamping amplifier, an automatic gain control circuit, and a cascaded differential amplifier were fabricated and tested. The differential amplifier circuit provided the best fit to the design goals and demonstrated a phase shift of /+-/3ns over a dynamic range of 70dB. This amplifier hasmore » been used in a radar to obtain range images of scale models of targets in the laboratory. 6 figs.« less" @default.
- W52003716 created "2016-06-24" @default.
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- W52003716 date "1988-01-01" @default.
- W52003716 modified "2023-09-27" @default.
- W52003716 title "Phase comparator for range imaging laser radar" @default.
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