Dual-wavelength frequency-chirped microwave AMCW ladar system

Details Dual-wavelength frequency-chirped microwave AMCW ladar system Dual-wavelength frequency-chirped microwave AMCW ladar system

1994-06-15

1996-07-09

Tarcza, Thomas H.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 515, G01C 300

Patent

active

055349935

ABSTRACT:
An amplitude modulated continuous wave (AMCW) laser radar (ladar) system is provided with a dual-wavelength source 10 which provides a dual wavelength signal 12 (one fixed and one chirped) which is launched down a fiber 28 to a target 38 and reflected back along the fiber 28 and the return detected by a detector 52. The transmitted signal is detected by a detector 56. The detectors 52, 56 provide an electrical return beat signal and reference beat signal, respectively, indicative of the difference between the wavelengths incident thereon. The signals are fed to a frequency mixer 60 which subtracts the two beat frequencies and signal processing logic 64 computes the distance to the target 38. Using dual wavelengths and beat frequencies provides a much broader chirp bandwidth than conventional ladar techniques, and allows for higher power sources, thereby reducing range error.

REFERENCES:
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patent: 4729653 (1988-03-01), Kobayashi
patent: 4932775 (1990-06-01), Wissman et al.
Optic Letters vol. 17, No. 6, 15 Mar. 1992, pp. 420-422, G. A. Ball and W. W. Morey, "Continuously tunable single-mode erbium fiber Laser".
SPIE, vol. 1799 (1992), pp. 120-124, G. L. Abbas et al, "Ladar Fiber Optic Sensor System for Aircraft Applications".
Electronics Letters, vol. 29, No. 18, 2 Sep. 1993, pp. 1623-1624, G. A. Ball et al, "Low Noise Single Frequency Linear Fiber Laser".
IEEE Photonics Technology Letters, vol. 6, No. 2, Feb. 1994, pp. 192-194, G. A. Ball et al, "60 mW 1.5 .mu.m Single-Frequency Low-Noise Fiber Laser MOPA".

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