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 |
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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