Multichannel optical correlator for radar signal processing

David Casasent; Edward Klimas

doi:10.1364/AO.17.002058

Applied Optics
Vol. 17,
Issue 13,
pp. 2058-2063
(1978)
•https://doi.org/10.1364/AO.17.002058

Multichannel optical correlator for radar signal processing

David Casasent and Edward Klimas

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David Casasent and Edward Klimas, "Multichannel optical correlator for radar signal processing," Appl. Opt. 17, 2058-2063 (1978)

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Abstract

A multichannel coherent optical processor for radar signals is described in which pulse compression is achieved by matched spatial filtering. The optical system can be used for phased array, linear frequency modulated pulse burst, or other radar systems. However, only its application to linear phased array signal processing is discussed in depth. From the output optical pattern, one can obtain data on the target's fine range and azimuth (for a phased array) or fine range and Doppler (for a pulse burst radar) etc.

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s_t = 13-bit Barker code	d/λ _c = 0.5
$f_{i f}^{″} = 3 cycles / mm$	λ = 633 nm
f₁ = 300 mm	D = 20 mm
f₂ = 381 mm	l₀ = 0.1575 mm
f₃ = 762 mm	l₁ = 1.27 l₀

Parameters		Theoretical (mm)		Experimental (mm)

R_F	θ(°)	Δx₂	Δy₂	Δx₂	Δy₂
0.45R_B	0	+2.00	0	+2.05	0
0.50R_B	0	0	0	0	0
0.55R_B	0	−2.00	0	−2.00	0
0.45R_B	5	+2.00	0.205	+2.03	0.22
0.50R_B	5	0	0.205	0	0.22
0.55R_B	5	−2.00	0.205	−2.04	0.22
0.50R_B	10	0	0.41	0	0.44
0.50R_B	15	0	0.62	0	0.65
0.50R_B	20	0	0.82	0	0.85
0.45R_B	30	+2.00	1.2	+2.05	1.3
0.50R_B	30	0	1.2	0	1.3
0.55R_B	30	−2.00	1.2	−2.03	1.3

s_t = 13-bit Barker code	d/λ _c = 0.5
$f_{i f}^{″} = 3 cycles / mm$	λ = 633 nm
f₁ = 300 mm	D = 20 mm
f₂ = 381 mm	l₀ = 0.1575 mm
f₃ = 762 mm	l₁ = 1.27 l₀

Parameters		Theoretical (mm)		Experimental (mm)

R_F	θ(°)	Δx₂	Δy₂	Δx₂	Δy₂
0.45R_B	0	+2.00	0	+2.05	0
0.50R_B	0	0	0	0	0
0.55R_B	0	−2.00	0	−2.00	0
0.45R_B	5	+2.00	0.205	+2.03	0.22
0.50R_B	5	0	0.205	0	0.22
0.55R_B	5	−2.00	0.205	−2.04	0.22
0.50R_B	10	0	0.41	0	0.44
0.50R_B	15	0	0.62	0	0.65
0.50R_B	20	0	0.82	0	0.85
0.45R_B	30	+2.00	1.2	+2.05	1.3
0.50R_B	30	0	1.2	0	1.3
0.55R_B	30	−2.00	1.2	−2.03	1.3

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Equations (13)

Applied Optics