October 23, Ivan R. Navarro Presented by: David N. Franc National Oceanic and Atmospheric Administration

Transcription

1 Use f Radi Spectrum fr Meterlgy: Weather, Water and Climate Mnitring and Predictin: Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz Octber 23, 2017 Ivan R. Navarr Presented by: David N. Franc Natinal Oceanic and Atmspheric Administratin

2 Backgrund In March 2014, the Federal Cmmunicatins Cmmissin reallcated the MHz band t shared use with mbile wireless services Advanced Wireless System-3 (AWS-3) Auctin cmpleted in January, 2015 Spectrum t be used fr Uplink fr AWS-3 User Equipment t the Base Statin 27 Prtectin Znes established t prtect incumbent peratin f 47 Federal earth statins (Prtectin Znes may include multiple antennae) Tw difference radii are defined fr each Prtectin Zne, ne each fr maximum User Equipment EIRPs f 20 dbm and 30 dbm Federal earth statins in the MHz band will cntinue t receive satellite signals indefinitely n a primary basis in the MHz band n a c-primary basis in the MHz band Under the AWS-3 Reprt & Order, Rules require successful crdinatin with Federal incumbents prir t peratin in Prtectin Znes AWS-3 licensees are permitted t perate anywhere utside f the Prtectin Znes withut prir crdinatin, but must nt cause interference t incumbent peratins 23 Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 2

3 Spectrum Sharing Assumptins Incumbent peratins must be prtected t allw incumbent agencies t accmplish their missins Operating cnditins and mitigatins fr spectrum sharing exist t efficiently utilize the AWS-3 spectrum Operatr Agreements cdify crdinatin f AWS-3 peratins inside federal Prtectin Znes, including: Crdinatin Prcess Methdlgy fr mdeling peratins and apprving AWS-3 twer deplyments Interference Ntificatins and access t histrical EME data Mitigating actins, if and when interference events ccur Disputes and Mdificatins 23 Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 3

4 Spectrum Sharing Impacts Impacts t federal peratins are nt just due t ptential fr Radi-frequency Interference (RFI) Sharing spectrum changes hw agencies cnduct and manage peratins, and creates the need fr a new capability t deal with the "business" f sharing spectrum. This requires: Crdinatin agreements with each Licensee, including administratin f the agreements t manage mdificatins and reslve disputes Mdeling f the interperability between earth statin receivers and the t-be develped and implemented AWS-3 netwrk Must be sustained by updates as technlgies evlve Centralized mnitring fr Interference and f Electr-magnetic Envirnment (EME) Respnding t RFI events requires: Functinality fr Detectin, Classificatin, Identificatin, and Ntificatin Mitigating actins by Licensee Operatinal adjustments and assciated mdificatins t existing Agreements Pssible need fr enfrcement actins by spectrum regulatr 23 Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 4

5 FCC Rules and Crdinatin Principles Rules require each AWS-3 licensee, prir t its first peratins in its AWS-3 licensed area, t reach a crdinatin arrangement with each Federal agency n an peratr-t-peratr basis Incumbents and Licensees will share infrmatin regarding each ther's peratins t facilitate successful sharing f the AWS-3 spectrum Prvide the Licensee an interface t a Radi Frequency Interference Mnitring System (RFIMS) t enable real-time ntificatin f interference events and access t measured electr-magnetic envirnment data archive The Licensee will adjust r limit its netwrk peratins when its AWS-3 peratins causes interference If AWS-3 peratins change in such a way t invalidate the established mdel, the analysis methdlgy will be updated t reflect the changes and the crdinatin prcess is repeated 23 Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 5

6 Satellite Operatins Gestatinary Satellites: GOES is in a gestatinary (GEO) Orbit, ~35,000 km altitude ( MHz band, adjacent band) Parked in a particular lcatin ver the equatr Large ftprint/field f view Orbital perid is 24 hurs, stays ver the same lcatin as the earth rtates Data is cllected 24/7 since satellite is always in view Plar Orbiting Satellites: POES and METOP are in Lw Earth Orbit (LEO), ~500 km ( MHz band, c-channel) LEO rbits fly ver the earth s ples (plar rbit) Much smaller ftprint/field f view cmpared t GEO Orbit is Sun Synchrnus the rbit rtates relative t the earth, apprximately 1⁰ per day Orbital perid is abut 102 mins, and the satellite circles the earth apprximately 14 times per day (fr plar rbiting newer satellites) Typical signal cntact perid fr earth statin receiver is minutes 23 Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 6

7 NOAA GOES & POES Satellite Dwnlink Frequencies 23 Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 7

8 Federal Earth Statin Sites Satellite Operatins Cmmand and Cntrl Wallps Island, VA; Fairbanks, Alaska; Suitland, MD; Fairmnt, West Virginia; Greenbelt, MD Transmit and Receive Natinal Weather Service Centers fr Envirnmental Predictin Natinal Hurricane Center (Miami), Aviatin Weather Center (St. Luis, MO), Space Wx Predictin Center (Bulder, CO), Strm Predictin Center (Nrman, OK), NOAA Center fr Weather and Climate Predictin (Cllege Park, MD) Receive nly Oceans and Atmspheric Research Labratries Atlantic Oceangraphic and Meterlgical Labratry (AOML) (Miami, FL), Earth System Research Labratry (ESRL) (Bulder, CO) Receive nly Other Agencies Defense and Interir Departments Receive nly 23 Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 8

9 AWS-3 Basic Ecnmic Areas and Federal Prtectin Znes 23 Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 9

10 GEO Satellite Cnstellatin Current Satellites: GOES-East W Lngitude GOES-West W GOES-Spare W 23 Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 10

11 GOES Visibility frm Earth GOES-West W GOES-Spare W GOES-East 75 0 W The farther away the satellite is frm the grund statin, the lwer the elevatin angle f the antenna Antennas are interchangeable and can be switched t anther satellite when necessary Satellites can drift t ther lcatins if necessary WCDAS 23 Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 11

12 Plar (LEO) Satellite Cnstellatin Satellites: POES-15, POES-18, POES-19 METOP-A, METOP-B POES METOP 23 Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 12

13 POES Field f View (Ftprint) 23 Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 13

14 Tracking Plar Satellites Antenna's vulnerability t cupling with interfering surce is nt static Max Elevatin West NW SW FCT AOS AOS => Acquisitin f Signal FCT => First Cntact Nrth Suth LCT LOS NE SE LCT => Last Cntact LOS => Lss f Signal Critical antenna angle fr acquiring the satellite presents the greatest vulnerability East 23 Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 14

15 WCDAS 10-day POES Plan Typical day f POES/METOP cntacts at WCDAS 15 cntacts Avg. cntact: 13.5 minutes Shrtest cntact: 9 minutes Lngest cntact: 18 minutes Max elevatin range: day pass plans are generated nce per week, unless there are changes JDAY 102 DATE = S/C REV AOS FCT LCT LOS MAX EL M M N N N N N N M M N N N N N METOP-A NOAA-15 NOAA-18 NOAA-19 A Day in the Life Schedule at WCDAS Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 15

16 Predicting Satellite Psitin Satellite rbits are defined using tw-line element sets (TLE) TLE s list a satellite s rbital elements that define it s rbit, prvides it s lcatin in space at a given time (epch), which can be used t predict it s psitin in the future. TLE s are rutinely updated t accunt fr planned rbit adjustments and changes in the rbit due t atmspheric drag TLE s available frm: Example f Tw-line Element Sets fr POES Satellites NOAA 15 [B] U 98030A NOAA 18 [B] U 05018A NOAA 19 [+] U 09005A Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 16

17 Crdinatin Prcess Crdinatin Requests are submitted by Licensees via a gvernment perated Crdinatin Prtal Based n License Blck and Basic Ecnmic Area Crrespnding agency is ntified and must acknwledge receipt within five days Each Agency will use its wn cmputer simulatin capability t mdel interperability between AWS-3 and MetSat receivers in accrdance with agreed upn methds Incumbent respnse is due within 60-days after the Crdinatin Request is deemed t be valid Licensee receives a Results Letter after analysis is cmplete Indicates which sectrs are apprved and which are denied May apprve sectrs with certain perating cnditins (restrictins) impsed Nte: These restrictins may be mutually agreed upn by AWS-3 peratr t functin as mitigatins, enabling greater access t spectrum within the Prtectin Zne 23 Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 17

18 Mdeling Interference fr Crdinatin Green indicate sectrs that may perate when MetSat antenna is pinting at 5 degrees elevatin, degrees azimuth Sample simulatin result Purple indicate sectrs that may NOT perate when MetSat antenna is pinting at 5 degrees elevatin, degrees azimuth (in this example) Pink indicate sectrs that may NOT perate n matter where the MetSat antenna is pinting Nte: This pssible simulatin assumes a tempral sharing envirnment, which has nt been agreed upn. 23 Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 18

19 Interference Mnitring Simulatin f mbile devices is difficult and carries risks fr errrs. Errrs may result in - An verly cnservative mdel, resulting in underutilized spectrum, r an verly ptimistic mdel, resulting in interference Mnitring f the EME will allw peratrs t "calibrate" the mdel based n empirical measurements, crrelating bserved interference nise pwer level t data lss metrics and netwrk traffic data If and when interference ccurs, the mnitring system will aid in differentiating interference surces and prvide "evidence" fr identificatin 23 Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 19

20 Current Interference Event Prcedures GOES Operatr mnitrs GOES dwnlink with built-in alarms that alert peratrs Alarms: Link Margin, Bit Errr Rate, Frame Lck Lss, Ttal Number f Frames GOES dwnlink signal split ut t individual paylad receivers (LTIR, EMWIN, DCPR, etc.) GOES paylad peratrs mnitr individual dwnlink signals POES POES frames cllected are cmpared with plan pst-pass If signal degradatin is detected, trubleshting may include: Data cmpared acrss paylads Antennas swap Crdinatin with lcal spectrum mnitrs Data nt cllected in real-time is lst 23 Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 20

21 Future Interference Event Prcedures Wrkflw being develped based n Licensee lcatins, License Blck, and implemented AWS-3 service Licensee netwrk is in develpment Planning fr LTE peratin using 4G technlgy Expecting shift t Narrwband Internet-f-Things service, pssibly using 5G technlgy in the future Must sustain current prcedures t rule ut equipment malfunctins as surce f signal lss Rely n interference mnitring capability t detect, classify, and identify the surce(s) f RFI Prvides interface t autmate ntificatin t identified AWS-3 peratr 23 Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 21

22 Interference Mnitring System Prttyping and Testing Establishing Interference Mnitring Testbed Objectives: Characterize interference pwer and wavefrm Characterize effectiveness f mnitring slutins Resurces: Existing NOAA antenna and receiver equipment Test facility in Bulder, Clrad 23 Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 22

23 What's Next Licensees develp netwrk and prvide incumbents with finalized perating characteristics and mitigatin techniques emplyed t maximize utilizatin f spectrum Incumbents cmplete interference analysis mdel t use as the basis fr crdinatin Parties sign Crdinatin Agreements Develp, test and deply an Interference Mnitring capability at federal earth statin lcatins Prcess crdinatin Requests in accrdance with Operatr Agreements Operate using shared spectrum Mnitr fr Interference and mitigate as required 23 Octber, 2017 Impact f Deplyment f Mbile Services n Meterlgical Operatins in MHz 23

24 Questins? 24