RECOMMENDATION ITU-R M.1828

Transcription

1 Rc. ITU-R M RECOMMENDATION ITU-R M.188 Tchnical and oprational rquirmnts for aircraft stations of aronautical mobil srvic limitd to transmissions of tlmtry for flight tsting in th bands around 5 GHz (007) Scop This Rcommndation provids th tchnical and oprational rquirmnts for aircraft stations of aronautical mobil srvic limitd to transmissions of tlmtry for flight tsting that should b usd by administrations as a tchnical guidlin for stablishing conformanc rquirmnts for aircraft stations for worldwid us. Th ITU Radiocommunication Assmbly, considring a) that various tchnically and oprationally diffrnt aronautical mobil srvic (AMS) limitd to transmissions of tlmtry systms for flight tsting ntworks hav bn dsignd to commnc opration in th nar futur; b) that th opration of aircraft station is usually a subjct of a numbr of national and intrnational ruls and rgulations including satisfactory conformanc to a mutually agrd tchnical standard and oprational rquirmnts; c) that thr is a nd for idntifying th tchnical and oprational rquirmnts for th conformanc tsting of aircraft stations; d) that th idntification of tchnical and oprational rquirmnts for aircraft stations would provid a common tchnical basis for facilitating conformanc tsting of aircraft station by various national and intrnational authoritis and th dvlopmnt of mutual rcognition arrangmnts for conformanc of aircraft stations; ) that th tchnical and oprational rquirmnts nd to achiv an accptabl balanc btwn radio quipmnt complxity and th nd for ffctiv us of th radio-frquncy spctrum, considring also a) that in th frquncy band MHz thr ar allocations to aronautical radionavigation, fixd-satllit (Earth-to-spac) and mobil srvics on a primary basis; b) that thr is a rquirmnt to fully protct all primary srvics in th band MHz; c) that WRC-03 adoptd Rsolution 9 which govrns us of band MHz by th mobil srvic for th implmntation of wirlss accss systms (WAS) including radio local ara ntworks (RLANs); d) that th idntification by ITU-R of tchnical and oprational rquirmnts for aircraft stations oprating in th band MHz should prvnt unaccptabl intrfrnc to othr srvics;

2 Rc. ITU-R M.188 ) that tchnical and oprational charactristics should b continuously and accuratly masurabl and controllabl; f) that th band MHz is allocatd to th aronautical radionavigation srvic on a primary basis; g) that th MLS can b protctd through th implmntation of an adquat sparation distanc btwn a radiating aronautical mobil srvic (AMS) transmittr to support tlmtry and MLS rcivrs; h) that th ITU-R is in th procss of dvloping guidanc matrial on th application of th mthodology dscribd in Rcommndation ITU-R M.189, rcognizing a) that th band MHz is to b usd for th opration of th intrnational standard microwav landing systm (MLS) for prcision approach and landing; th rquirmnts for this systm shall tak prcdnc ovr othr uss of this band in accordanc with No of th Radio Rgulations (RR), rcommnds 1 that th tchnical and oprational rquirmnts for aircraft stations of AMS limitd to transmissions of tlmtry for flight tsting oprating in th 5 GHz band givn in Annxs 1 and should b usd by administrations as guidlins to facilitat compatibility with othr srvics; that all aircraft stations of AMS limitd to transmissions of tlmtry for flight tsting and transmitting simultanously within on AMS ntwork should us non-ovrlapping spctrum. Annx 1 Tchnical and oprational rquirmnts for aircraft stations of AMS limitd to transmissions of tlmtry systm for flight tsting ntworks in th bands around 5 GHz Part A Essntial rquirmnts rlatd to th protction of FSS ntworks in th band MHz An aircraft station of AMS in th band MHz should b dsignd in such a mannr that on aircraft station transmittr powr flux-dnsity b limitd to 138 db(w/(m 1.3 MHz)) at th FSS satllit orbit for spaccraft using full Earth covrag rciv antnnas. Th maximum aggrgat intrfrnc lvl of 1% T s /T s tolrabl at th rcivr input is I Agg-Rc : I Agg Rc = KTB 0 db = db(w /1.3 MHz)

3 Rc. ITU-R M K: Boltzmann s constant (1.38-3) T: rprsnts th rcivr nois tmpratur: 550 K B: rcivr bandwidth: 1.3 MHz. Thrfor at th satllit rcivr antnna input th maximum pfd lvl producd by on AMT transmittr is: pfd Max = I Agg Rc Gr + LFd + LP = = 138 dbw /(m 1.3 MHz) 10 log 10 4π (1) + 10 log λ G r : FSS rcivr antnna gain 1: maximum numbr of AMT station mitting simultanously in th FSS rcivr bandwidth. NOTE 1 Th aformntiond limit rlat to th pfd would b obtaind undr fr-spac propagation conditions. NOTE An.i.r.p. mask can b drivd from th aformntiond pfd valu by applying th mthod givn in Part A of Annx. Simplification of th rsulting.i.r.p. mask could also b considrd. NOTE 3 Th afor-mntiond limit corrsponds to db(w/(m Hz)). NOTE 4 Th pfd limit dfind in this sction is basd on nsuring that th incras in nois tmpratur of th FSS satllit (i.. T sat /T sat ) du to opration of th AMT dos not xcd 1%. Th mthodology assums 1 co-channl AMT transmittrs oprating concurrntly within th fild of viw of th FSS satllit. Part B Essntial rquirmnts rlatd to th protction of th mobil srvic in th band MHz Th ssntial rquirmnts which follow only rprsnt a tchnical guidlin. In th MHz frquncy band, th maximum pfd producd at th surfac of th Earth by missions from an aircraft station, of an AMS systm limitd to transmissions of tlmtry for flight tsting ntwork should not xcd: 79.4 db(w/(m 0 MHz)) G r (θ). Administrations may choos to implmnt diffrnt AMS tchnical and oprational rquirmnts which ar mor stringnt than thos rfrncd in this sction to protct th mobil srvic. Furthr study may b ncssary if diffrnt paramtrs ar usd than thos assumd in dvloping this guidlin.

4 4 Rc. ITU-R M.188 G r (θ) rprsnts th mobil srvic rcivr antnna pattrn vrsus lvation angl θ and is dfind as follows: Wirlss accss systm lvation antnna pattrn Elvation angl, θ (dgrs) Gain (dbi) 45 < θ < θ < θ < θ < θ < θ < θ 60 5 G r (θ): gain rlativ to an isotropic antnna (dbi) θ: absolut valu of th lvation angl rlativ to th angl of maximum gain (dgrs) FIGURE 1 Mobil srvic rcivr antnna pattrn NOTE 5 Th aformntiond limits rlat to th pfd and angls of arrival that would b obtaind undr fr-spac propagation conditions.

5 Rc. ITU-R M NOTE 6 An.i.r.p. mask can b drivd from th aformntiond pfd mask by applying th mthod givn in Part B of Annx. Simplification of th rsulting.i.r.p. mask could also b considrd. Part C Essntial rquirmnts rlatd to th protction of th aronautical mobil (rout) srvic (AM(R)S) in th band MHz Th AM(R)S rcivr charactristics basd on IEEE standard and ITU-R Rcommndations takn into account in this sharing study ar as follow: Protction critria: I/N of 6 db as xprssd in Rcommndation ITU-R M.1739 and which corrsponds to a rang rduction of 5%. Rcivr nois factor: 10 db. Implmntation loss: 5 db. Building loss: 0 db (outdoor usag). Rcivr bandwidth: 0 MHz. Antnna pattrn: Th AM(R)S rcivr antnna gain vrsus lvation angl pattrn considrd in th analysis is adoptd from th Rcommndation ITU-R F and shown in Fig.. Pak gain is assumd to b 6 dbi. In th MHz frquncy band, th maximum pfd producd at th surfac of th Earth by missions from an aircraft stations, of an AMS systm limitd to transmissions of tlmtry for flight tsting ntwork should not xcd: 89.4 db(w/(m 0 MHz)) G r (θ). Gr(θ) rprsnts th mobil srvic rcivr antnna pattrn vrsus lvation angl θ and is dfind as follows: G(θ): G G r [ G ( θ), G ( )] ( θ) = max 1 θ θ G 1( θ) = θ ( θ) = log max,1 7 gain rlativ to an isotropic antnna (dbi) 1.5 θ: absolut valu of th lvation angl (dgrs) Th pfd and th rsultant EIRP mask ar provisional, and nd to b confirmd whn th AM(R)S is mor fully dvlopd.

6 6 Rc. ITU-R M.188 FIGURE AM(R)S rcivr antnna pattrn NOTE 7 Th aformntiond limits rlat to th pfd and angls of arrival that would b obtaind undr fr-spac propagation conditions. NOTE 8 An.i.r.p. mask can b drivd from th aformntiond pfd mask by applying th mthod givn in Part B of Annx. Simplification of th rsulting.i.r.p. mask could also b considrd. Part D Essntial rquirmnts rlatd to th protction of th aronautical radionavigation srvic oprating in th band MHz Whn bilatral coordination is ncssary btwn administrations oprating microwav landing systms and administrations oprating AMT systms, ITU-R Rcommndation prsntd in considring also h) could hlp for bilatral discussions. Part E Essntial rquirmnts rlatd to th protction of th aronautical scurity application in th band MHz Studis hav shown that whr AMS(AS) and AMS(AMT) ar not oprating ovrlapping frquncis thn frquncy compatibility is achivd and no ssntial rquirmnts ar ndd to protct th AMS(AS) application. Howvr, for th ovrlapping frquncy opration, furthr studis nd to b dvlopd.

7 Rc. ITU-R M Annx Drivation of an.i.r.p. mask from a pfd limit Part A Drivation of a highr hmisphr.i.r.p. mask from a pfd limit In tsting AMS quipmnt limitd to transmissions of tlmtry for flight tsting to dtrmin if it mts a givn pfd limit, such as th on in Part A of Annx 1, it may b usful to dtrmin an quivalnt.i.r.p. mask that can b usd for tsting purposs. Th pfd limit can b usd to mathmatically dtrmin a highr hmisphr.i.r.p. mask,.i.r.p. (θ, H) whr θ is th angl abov th local horizontal plan and H is th altitud of th aircraft. This convrsion procds in two stps. First, θ is convrtd to an quivalnt angl blow th horizontal at th satllit, γ. Thn th lngth of th propagation path for angl abov th horizontal θ is dtrmind and usd to calculat th sprading loss for th path and th rsulting.i.r.p. Stp 1: Calculation of an angl blow th horizontal at th satllit (dgrs), γ, from θ and H: θ : R : γ = arccos ( R + H ) cos( θ) ( R + ) H Sat angl abov th horizontal at th aircraft stations arth radius (6 378 km) H : altitud of th aircraft (km) H Sat : altitud of th FSS satllit (km) γ : angl blow horizontal at th satllit. Stp : Calculation of th.i.r.p. valu from th dfind pfd limit: d : pfd :.i.r.p. : ( R + H ) + ( R + H ) ( R + H )( R H ) cos( γ θ) ) 1/ d = sat + sat.i.r.p.( θ, H ) = pfd + 10 log10 (4 π d ) + 60 distanc btwn th aircraft stations and th considrd point on th Earth s surfac (km) pfd limit (db(w/(m MHz))) (db(w/mhz)). Figur 3 shows this function for an aircraft altituds of 1 km basd on th pfd limit providd in Part A of Annx 1. In this xampl, H sat is takn as km.

8 8 Rc. ITU-R M.188 FIGURE 3 Part B Drivation of a lowr hmisphr.i.r.p. mask from a pfd limit In tsting AMS quipmnt limitd to transmissions of tlmtry for flight tsting to dtrmin if it mts a givn pfd limit, such as th on in Part B of Annx 1, it may b usful to dtrmin an quivalnt.i.r.p. mask that can b usd for tsting purposs. Th pfd limit can b usd to mathmatically dtrmin an.i.r.p. mask,.i.r.p. (γ, H) whr γ is th angl blow th local horizontal plan and H is th altitud of th aircraft. This convrsion procds in two stps. First, γ is convrtd to an quivalnt angl of arrival, θ. Thn th lngth of th propagation path for angl of arrival θ is dtrmind and usd to calculat th sprading loss for th path and th rsulting.i.r.p. Stp 1: Calculation of an angl of arrival in dgrs, θ, from γ and H: θ : R : angl of arrival θ = arccos(( R arth radius (6 378 km) + H ) cos( γ)/ R H : altitud of th aircraft (km) γ : angl blow horizontal. NOTE 1 If th argumnt of th arccos function is gratr than 1, th propagation path in th dirction of th angl γ dos not intrsct th Earth. In this cas, which occurs for valus of γ of about 3.5 or lss, a valu for θ dos not xist and so thr is no dfind valu for th pfd mask. )

9 Rc. ITU-R M Stp : Calculation of th.i.r.p. valu from th dfind pfd limit: d = ( R + ( R + H ) R ( R + H ) cos( γ θ)).i.r.p.(γ, H ) = pfd + 10log10 (4 π d ) + 60 d : distanc btwn th aircraft stations and th considrd point on th Earth s surfac (km) pfd : pfd limit (db(w/(m MHz))).i.r.p. : (db(w/mhz)). Figur 4 shows this function for various aircraft altituds basd on th pfd limit providd in Part B of Annx 1. 1/ FIGURE 4