GPSIA Says NASCTN Data Shores Up Case for 1 dB Standard
National Advanced Spectrum and Communications Test Network (NASCTN) findings on LTE signal effects on GPS devices released earlier this year (see 1702160056) confirm a 1 dB noise floor interference metric is the best way to assess the effects on GPS,…
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GPS Innovation Alliance said in an FCC docket 12-340 filing Friday. It said a 1 dB decrease in noise floor is associated with quantifiable changes in performance, such as increased mean time between cycle clips. It said NASCTN test data shows a correlation between noise floor degradation and other metrics, backing use of the 1 dB standard for determining harmful interference. Ligado opposed the 1 dB standard for evaluation of its terrestrial wireless broadband plans (see 1702160056). It said it will review the GPSIA filing, but "the only question is whether Ligado's spectrum plan can co-exist with GPS devices. We're pleased that John Deere, Garmin, Trimble, and Topcon -- all of the members of GPSIA -- plus NovAtel have concluded the answer is ‘Yes.’”