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Table 1
Comparison of LLR and DLLR.
| Technique | Laser | Constellation | Station switching (for one measurement) | Observation | Accuracy | Atmospheric error | Received photons |
|---|---|---|---|---|---|---|---|
| LLR | Pulsed | One station, one reflector | No | Range | About 8 mm (LLR highest ranging accuracy, for a single shot, APOLLO station) About 30 μm | Major error source | Single-photon level or a few photons (one laser pulse) |
| DLLR | CW | One station, two or more reflectors | Yes | Range difference | (estimated according to the error from the Earth’s atmosphere) | Significantly reduced | Large flux |
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