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Project Cyclops Comparison Table (1971)

9010-025


9010-025a


 

 

OPTICAL

INFRARED MICROWAVE
PARAMETER A B A B A B
Wavelength 1.06 m 1.06 m 10.6 m 10.6 m 3 cm 3 cm
TRANSMITTER
Antenna Diameter 22.5 cm 22.5 cm 2.25 m 2.25 m 100 m 3 km*
No. Of Elements 1 1 1 1 1 900
Element Diameter 22.5 cm 22.5 cm 2.25 m 2.25 m 100 m 100 m
Antenna Gain 4.4 X 1011 4.4 X 1011 4.4 X 1011 4.4 X 1011 1.1 X 108 9.8 X 1010
Peak/CW Power 1012 W 105 W 105 W 105 W 105 W 105 W
Modulation Pulse Pulse Pulse PSK PSK PSK
Pulse Duration 10-9 sec 1 sec 1 sec 1 sec 1 sec 1 sec
Energy Per Bit 103 J 105 J 105 J 105 J 105 J 105 J
EIRP 4.4 X 1023 W 4.4 X 1016 W 4.4 X 1016 W 4.4 X 1016 W 1.1 X 1013 W 9.9 X 1015 W
Beamwidth 1" 1" 1" 1" 64" 1"

* Array spread out to 6.4 km diameter to avoid vignetting.

 


9010-025b


 

 

OPTICAL

INFRARED MICROWAVE
PARAMETER A B A B A B
Wavelength 1.06 m 1.06 m 10.6 m 10.6 m 3 cm 3 cm
RECEIVER
Antenna Diameter 100 m 100 m 100 m 2.25 m 100 m 3 km*
No. Of Elements 400 400 1975 1 1 900
Element Diameter 5 m 5 m 2.25 m 2.25 m 100 m 100 m
Atmosphere Tran. 0.7 0.7 0.5 0.5 1 1
Quantum Effic. 0.4 0.1 0.2 0.2 0.9 0.9
Solar Background 1.2 X 10-3 36 1.7 X 10-3 6 X 10-7 ----- -----
Noise Temp. 13,600 K 13,600 K 1360 K 1360 K 20 K 20 K
RF Bandwidth 1 GHz 3 MHz 3 kHz 1 Hz 1 Hz 1 Hz
Detection Method Photon Photon Sq. Law Synch. Synch. Synch.

* Array spread out to 6.4 km diameter to avoid vignetting.


9010-025c


 

 

OPTICAL

INFRARED MICROWAVE
PARAMETER A B A B A B
Wavelength 1.06 m 1.06 m 10.6 m 10.6 m 3 cm 3 cm
SYSTEM
Range Limit (L.Y.) 26 24 22 41 500 450,000
State Of The Art? ? No ? No Yes Yes
All Weather? No No No No Yes Yes

Data taken from Table 5-3, page 50, July 1973 revised edition (CR 114445) of the Project Cyclops design study of a system for detecting extraterrestrial life. This study was prepared under Stanford/NASA/Ames Research Center 1971 summer faculty fellowship program in engineering systems design.

A infrared systems are essentially state-of-the-art (for 1971).

B infrared systems are futuristic (for 1971).

The performance of the above modelled 1.06 m and 10.6 m systems has been severely compromised by restricting the transmitters and receivers to ground-based operation within terrestrial-type atmospheres, and limiting beamwidth to 1 second of arc. Note that atmospheric coherence cell size is about 20 cm at = 0.5 m, and is proportional to 6/5.

 


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