Project Cyclops Comparison Table (1971)
9010-025
9010-025a
| |
OPTICAL
|
INFRARED |
MICROWAVE |
| PARAMETER |
A |
B |
A |
B |
A |
B |
| Wavelength |
1.06 µm |
1.06 µm |
10.6 µm |
10.6 µm |
3 cm |
3 cm |
| TRANSMITTER |
| Antenna Diameter |
|
|
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 µm |
1.06 µm |
10.6 µm |
10.6 µm |
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 µm |
1.06 µm |
10.6 µm |
10.6 µm |
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.
| 