The Global Positioning System A Shared National Asset (1995) / Chapter Skim
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Pages 254-254
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254 UPS: A Shared National Asset 12.6 dB is more than adequate for detection, which means that the ratio of signal voltage-to-noise is 4.3. If the detection threshold were conservatively set at three times the noise there would only be a 1-three sigma, or about ~ percent probability of false detection.
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