Indoor GPS Reradiating

0072-EX-PL-2014 Text Documents

MIT Lincoln Laboratory

2014-01-24ELS_145047

Documents attached with this t appliccation Name Purpose MITLL_ _FCC442_main.pdf this document, system m description MITLL_ _upstairs.xls calculatio ons for top flooor MITLL_ _downstairs.xxls calculatio ons for bottom m floor MITLL_ _gpsnetworking_quote.pd df quote of all parts to bee purchased ffor the system m VGL1L2HNRRKIT.pd df data sheeet for 1st kit too be purchaseed VGL1L2PNRRKIT.pd df data sheeet for 2nd kit t o be purchassed Introdu uction MIT Lincooln Laboratoryy is often homme to prototyype payloads during testing that requiree, or could grreatly benefit fro om receiving GPS signal. Moving M the paayloads outsidde can range from being a time consum ming task to be eing unfeasiblle, dependingg on the projeect. In additioon, some prottotypes cannoot easily acceept a wired GPSS feed. This le eaves re‐radiaating the GPS signal as thee only good opption. MIT Lin ncoln Laborattory would likee to permaneently install tw wo GPS re‐raddiating system ms for compleete indoor coverage in onee of our labs. A complete syystem has be een specified and approvedd by a vendorr of such systems. System m Descriptiion The diagraam below sho ows the desirred system co onfiguration tto be able to rre‐radiate GP he PS signals in th full lab space. Each flooor is approximmately 30’x50 0’ in size, and have 10’ or 115’ ceilings. TThe roof mounted active anttenna receive es the GPS siggnal but does not transmit any signals. TThe signal is ssplit into two feeds, and d sent to a paair of variable e gain amplifie ers. These re‐‐radiate the G GPS signal inside the lab sp pace. Gain can beb adjusted to meet FCC requirements on re‐radiateed power.

Radiate ed Power Calculatio C ons The vendo or of the system provided a spreadshee et of calculatiions to help eestimate the p power being re‐ radiated. Note that the e cable length h from the roof to the upsttairs amplifieer is approxim mately 65ft, an nd to the downstairs unit 10 el documents from the venndor are attacched to this aapplication, but 05ft. The exce the resultts are shown here for convvenience. Upstairs Downsta airs

Bill of Materials The below components are specified from vendor: gpsnetworking.com. Quote for parts from this vendor is also attached to this application. # Item Description 1 L1/L2VGHNRRKIT Kit of active antenna, variable gain amplifier and re‐radiating antenna 2 L1/L2VGPNRRKIT Kit of variable gain amplifier and re‐radiating antenna 3 HIALDCBS1X2 Antenna splitter 1x2 (with high isolation) 4 L1/L2RAMB Roof antenna mounting bracket 5 WRUMT (2x) Re‐radiating antenna mounting bracket 6 SURGEPRO Lighting surge protector for antenna 7 PCABLE (145ft) LMR400 Coaxial cable to connect various components


Document Created: 2014-01-13 09:55:11
Document Modified: 2014-01-13 09:55:11
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