Imaging and target detection with a heterodyne-reception optical radar

J. H. Shapiro; B. A. Capron; R. C. Harney

doi:10.1364/AO.20.003292

Imaging and target detection with a heterodyne-reception optical radar

J. H. Shapiro, B. A. Capron, and R. C. Harney

Applied Optics
Vol. 20,
Issue 19,
pp. 3292-3313
(1981)
•https://doi.org/10.1364/AO.20.003292

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J. H. Shapiro, B. A. Capron, and R. C. Harney, "Imaging and target detection with a heterodyne-reception optical radar," Appl. Opt. 20, 3292-3313 (1981)

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Abstract

A mathematical system model for a compact heterodyne-reception infrared radar is developed. This model incorporates the statistical effects of propagation through atmospheric turbulence, target speckle and glint, and heterodyne-reception shot noise. It is used to find the image signal-to-noise ratio of a matched-filter envelope–detector receiver and the target detection probability of the optimum likelihood ratio processor. For realistic parameter values it is shown that turbulence-induced beam spreading and coherence loss may be neglected. Target speckle and atmospheric scintillation, however, present serious limitations on single-frame imaging and target-detection performance. Experimental turbulence strength measurements are reviewed, and selected results are used in sample performance calculations for a realistic infrared radar.

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		LOG $C_{n}^{2}$ STATISTICS (TYPE I)		LOG $C_{n}^{2}$ STATISTICS (All Weather)

		MEAN	STD. DEV.	MEAN	STD. DEV.

FEB	NIGHT	−14.13	0.58	−14.12	0.68
	DAY	−12.76	0.41	−13.63	0.76
MAR	NIGHT	−14.33	0.60	−14.05	0.75
	DAY	−12.70	0.52	−13.12	0.82
APR	NIGHT	−13.67	0.43	−13.64	0.51
	DAY	−12.79	0.62	−12.82	0.63
MAY	NIGHT	−13.49	0.54	−13.54	0.57
	DAY	−12.56	0.37	−12.85	0.63

Average power (P_av)	1 W
Pulse repetition frequency (PRF)	30 kHz
Transmitter/receiver diameter (d)	10 cm
Photon energy (hν₀)	1.87 × 10⁻²⁰ J
Optical efficiency (ɛ)	0.1
Quantum efficiency (η)	0.5
Average target reflectivity (ρ)	0.1

		LOG $C_{n}^{2}$ STATISTICS (TYPE I)		LOG $C_{n}^{2}$ STATISTICS (All Weather)

		MEAN	STD. DEV.	MEAN	STD. DEV.

FEB	NIGHT	−14.13	0.58	−14.12	0.68
	DAY	−12.76	0.41	−13.63	0.76
MAR	NIGHT	−14.33	0.60	−14.05	0.75
	DAY	−12.70	0.52	−13.12	0.82
APR	NIGHT	−13.67	0.43	−13.64	0.51
	DAY	−12.79	0.62	−12.82	0.63
MAY	NIGHT	−13.49	0.54	−13.54	0.57
	DAY	−12.56	0.37	−12.85	0.63

Average power (P_av)	1 W
Pulse repetition frequency (PRF)	30 kHz
Transmitter/receiver diameter (d)	10 cm
Photon energy (hν₀)	1.87 × 10⁻²⁰ J
Optical efficiency (ɛ)	0.1
Quantum efficiency (η)	0.5
Average target reflectivity (ρ)	0.1

Abstract

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Tables (2)

Equations (121)

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