Acoustooptic spectrum analysis of radar signals using an integrating photodetector array

Jim P. Y. Lee

doi:10.1364/AO.20.000595

Applied Optics
Vol. 20,
Issue 4,
pp. 595-600
(1981)
•https://doi.org/10.1364/AO.20.000595

Acoustooptic spectrum analysis of radar signals using an integrating photodetector array

Jim P. Y. Lee

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Jim P. Y. Lee, "Acoustooptic spectrum analysis of radar signals using an integrating photodetector array," Appl. Opt. 20, 595-600 (1981)

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Abstract

This paper examines the instantaneous Fourier power spectrum for different types of radar signals such as cw, pulse-modulated cw, and linear FM signals using an acoustooptic spectrum analyzer. The effects on the time-integrated output intensity distribution, due to the truncation of the propagating acoustic signal by the finite aperture width of the Bragg cell and the amplitude weighting on the signal, are also analyzed. Some experimental results on pulse-modulated cw and linear FM signals are presented and then compared to theory.

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(D = 0.5125 cm, T = 0.25, α = 0.125/τ, F = 0.4 m)
PHOTOCELL LOCATION	CW SIGNAL		PULSE SIGNAL PW − 1.25 μSEC
	Theoretical Intensity	Experimental Intensity	Theoretical Intensity	Experimental Intensity
Centre Cell (normalized to unity)	1.0	1.0	1.0	1.0

1st Cell from centre	0.81	0.82	0.88	0.90

2nd	0.38	0.37	0.58	0.55

3rd	0.064	0.075	0.30	0.29

4th	0.0050	0.01	0.13	0.12

5th	0.031	0.03	0.076	0.08

6th	0.029	0.03	0.060	0.05

PULSE-WIDTH	1-μSEC CW = 150 MHz		2-μSEC CW = 150 MHz
	Theoretical Intensity	Experimental Intensity	Theoretical Intensity	Experimental Intensity
CENTRE CELL (Normalized to Unity)	1	1	1	1
1st Cell from Centre	0.87	0.88	0.59	0.58
2nd	0.55	0.53	0.11	0.13
3rd	0.24	0.23	0.038	0.050
4th	0.056	0.055	0.034	0.035
5th	0.015	0.020
6th	0.034	0.040
7th	0.046	0.045

LINEAR FM	THEORETICAL INTENSITY	EXPERIMENTAL INTENSITY
PULSE WIDTH = 5 μSEC
f₀ = 150 MHz
Δf = 1 MHz
CENTRE CELL (at 150 MHz, Normalized to Unity	1	1

1st Cell on Right of Centre Cell	0.95	0.96

2nd	0.40	0.40

3rd	0.13	0.13

1st Cell on Left of Centre Cell	0.95	0.93

2nd	0.40	0.42

3rd	0.13	0.12

(D = 0.5125 cm, T = 0.25, α = 0.125/τ, F = 0.4 m)
PHOTOCELL LOCATION	CW SIGNAL		PULSE SIGNAL PW − 1.25 μSEC
	Theoretical Intensity	Experimental Intensity	Theoretical Intensity	Experimental Intensity
Centre Cell (normalized to unity)	1.0	1.0	1.0	1.0

1st Cell from centre	0.81	0.82	0.88	0.90

2nd	0.38	0.37	0.58	0.55

3rd	0.064	0.075	0.30	0.29

4th	0.0050	0.01	0.13	0.12

5th	0.031	0.03	0.076	0.08

6th	0.029	0.03	0.060	0.05

PULSE-WIDTH	1-μSEC CW = 150 MHz		2-μSEC CW = 150 MHz
	Theoretical Intensity	Experimental Intensity	Theoretical Intensity	Experimental Intensity
CENTRE CELL (Normalized to Unity)	1	1	1	1
1st Cell from Centre	0.87	0.88	0.59	0.58
2nd	0.55	0.53	0.11	0.13
3rd	0.24	0.23	0.038	0.050
4th	0.056	0.055	0.034	0.035
5th	0.015	0.020
6th	0.034	0.040
7th	0.046	0.045

Abstract

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Applied Optics