ITU-R M.798 ** * ITU-R M.798 (7) 5 (WRC-) 5 (WRC-).(HF) (MF) (HF) (MF). 7. (MMS) (HF) (MF/HF) 7 7. (NBDP). : 5 (WRC-) (MF/HF) ( ) ( ) ( ) (MF/HF) ( 5 (WRC-) ((HF) ) ( 7 ) 8 ((x86).8 ( - - *.(IMO) - ) 7-7 9.. (IRS **
ITU-R M.798 ( (GMDSS) 7 ( 7 ) 7 ( ( ( (ECDIS) ( (HF) (MF) 97 (A) ( khz ( (EGC) NAVAREAS ( NAVTEX khz 58 Inmarsat ( 7 ( (MSI) ( ( (. VII
ITU-R M.798 (IP) ITU-R M.76 (ARQ) (FEC) ITU-R M.65.
ITU-R M.798 : : Pactor-III (OFDM).(GLN) : -.(IP).. " " :. " " -.callsign@xxx.com shipname@xxx.com -......." "
5 ITU-R M.798 - (OFDM).(DSP) OFDM... OFDM..... DATAPLEX. TOR. 5 OFDM OFDM ITU-R M.65.(IRS) (ISS). MASTER OFDM. END OVER OFDM.Hz 7 OFDM. (M = ) (N = ) OFDM. (M = ) (N = ). 6 OFDM ITU-R M.65 TOR. 5 OFDM. 6 8
ITU-R M.798 6 MASTER MASTER.SLAVE RTT -.SLAVE. MASTER (T = ) OFDM SALVE T = MASTER MASTER SLAVE. 8 MASTER.MASTER 5 6.MASTER.SLAVE SLAVE OFDM ITU-R M.65 OFDM. ( 7 ) OFDM master timing - Master - OFDMISS () ISS data burst (master) 8 ms IRS reply 6 ms ISS T = ms T = 8 ms + RTT T = 5 ms OFDM master timing - Slave - OFDM ISS IRS reply 6 ms () ISS data burst (slave) 8 ms IRS T = ms T = 8 ms + RTT T = ms T = 5 ms 798- OFDM.. OFDM 5. / 68 M = N =
7 ITU-R M.798 SEQ_NR LEN ( 5) ( ) x7ff DATA ( ) x CONTROL LEN LEN CONTROL. 6 ( ) SEQ_NR LEN DATA (SEQ_NR) (x7ff) 7... 7 7.OVER. (6 7) MAX_SEQ_NR_DIFF MAX_SEQ_NR_DIFF. 98.MAX_SEQ_NR_DIFF " ".. MAX_SEQ_NR_DIFF..... ARQ... LEN. (LEN) LEN. DATA. DATA..
ITU-R M.798 8 CONTROL LEN. CONTROL... 6.. XOR xffff xffff. xfb8 LEN OFDM. : SEQ_NR LEN ( ) ( 5) DATA ) ( ( ) LEN OFDM.. 6.... MAX_SEQ_NR_DIFF MAX_SEQ_NR_DIFF. 7 MAX_SEQ_NR_DIFF LEN OFDM..DATA..END OVER MY_CALL : OFDM
9 ITU-R M.798 OFDM SEQ_NR ( ) ( 5) CONTROL IDLE FILL PATTERN ( ) ( 9) ( 9 END OVER ) ( ) SEQ_NR LEN CONTROL IDLE FILL PATTERN ISS OVER.. OVER..CONTROL CONTROL OVER (x86) CONTROL END (x98) :END OVER SEQ_NR IDLE FILL PATTERN SEQ_NR IDLE FILL PATTERN CONTROL MYCALL (xe) OVER END OFDM.. Hz 7
ITU-R M.798 5 (NAK) (ACK). 6 OFDM..(M = ) (N = ).. BLOCK RESPONSE ( 6).NAK : ACK/NAK FORCED_OVER END_ACK. ACK/NAK..NAK. ACK. ACK. NAK ACK.NAK. (x56a9) ACK (xa956) NAK ACK/NAK ACK/NAK OFDM.
ITU-R M.798 OFDM... MAX_BLK_ERR ACK MAX_BLK_ERR. ACK. MAX_BLK_ERR FORCED_OVER OFDM. OVER.FORCED_OVER OVER FORCED_OVER. FORCED_OVER END_ACK END END_ACK END END_ACK. END_ACK.. STANDBY. END_ACK END_ACK (x956a) OFDM..OFDM..IRS ISS OFDM NAK ACK.. OFDM..
ITU-R M.798... 7. OFDM ACK. ACK. OFDM ( ( ( ( ( ( ( ) ACK ) ACK ) ACK ) ACK ) ACK ) ACK ) ACK NAK.......
ITU-R M.798 : (ISS) ( ( ( ( ) ACK ) NAK ) ACK ) NAK (IRS) (ISS) 5 6 (IRS) ( (5 ( (6 ) ACK ) ACK ) ACK ) ACK. 7 " ".. (NAK). :
ITU-R M.798 (ISS) ( ( ( ( ) NAK ) ACK ) ACK ) NAK (IRS) (ISS) 5 6 (IRS) (5 ( ( (6 ) ACK ) ACK ) ACK ) NAK... (NAK)....
5 ITU-R M.798 (ISS) (IRS) ( ( ( ( ) NAK ) ACK ) ACK ) NAK. 5 (NAK) (NAK).. (NAK)... ACK.. OFDM. USB.. (NAK) (NAK). (NAK).. ISS
ITU-R M.798 6 OVER ISS.IRS ISS OVER ISS. OVER OVER.OVER OVER OVER IRS FORCED_OVER IRS. OVER (NAK) ACK ACK/NAK IRS. ACK FORCED_OVER. ISS.OVER OVER. OVER ISS ISS.OVER IRS. FORCED_OVER OVER IRS FORCED_OVER ISS.ISS ACK.. OVER (ISS) 5 6 7 OVER (8 (5 ) ACK (6 ) ACK (7 ) ACK ) NAK (IRS) (ISS)
7 ITU-R M.798 NAK FORCED_OVER FORCED_OVER NAK (IRS) (IRS) NAK NAK NAK NAK (ISS) (IRS) ( ( ( ( ) ACK ) ACK ) ACK ) ACK END ISS.OFDM IRS ISS END IRS. END (). END.END_ACK IRS. ACK/NAK IRS. END ISS END ISS.
ITU-R M.798 8 END_ACK ISS END END_ACK IRS.STANDBY.END_ACK ISS ISS. END_ACK IRS. STANDBY END_ACK (ISS) 5 6 7 END (8 (5 ) ACK (6 ) ACK (7 ) ACK ) NAK (IRS) (ISS) (IRS) END_ACK END_ACK END_ACK END_ACK (IRS) END_ACK END_ACK END_ACK END_ACK
9 ITU-R M.798 OFDM CALLING 9 CALLING DATAPLEX. CALLING.FSK.DATAPLEX CALLING SELCAL,5 SELCAL SELCAL.x9 x 9 (SELCAL).CALLING. SELCAL CALLING. DATAPLEX SELCAL SELCAL MYCALL.MYCALL. SELCAL.IRS ISS DPSK FSK DATAPLEX SLAVE MASTER.OFDM SC SC [x9 x (M = N = ) 8 SC SC SC5 SC6 SC7 SC8 SC9 RATE CALLING TYPE CKSUM ] SELCAL SC9 SC FSK = FSK = ) = RATE DPSK = 6 DPSK = 5 DPSK6 = ([ = M = N] OFDM = 8-8 = TYPE (TYPE SC SC ) - = CKSUM RATE. OFDM CALLING SELCAL 8 TYPE CKSUM (FSK CALLING SELCAL 8 TYPE CKSUM <---(FSK) IRS ISS CALLING SELCAL ) OFDM LINK_ACK <--- <--- (FSK) CALLING
ITU-R M.798 LINK_ACK <--- OFDM ( 5 ) OFDM - ISS MYCALL MYCALL MYCALL MYCALL OFDM - IRS ( ( ( ( ) ACK ) ACK ) ACK ) ACK ISS OFDM DATAPLEX FSK ISS 5. DPSK IRS.IRS LINK_ACK ISS IRS IRS CS ISS.OFDM.OFDM FSK (IRS ) CS (ISS ) OFDM IRS ISS IRS ISS OFDM MAX_OFDM_LINK. MAX_OFDM_LINK.STANDBY ISS.IRS CS ISS IRS CS DPSK_ACK. OFDM CS CS DPSK_ACQ <--- (ms =T IRS <--- DSPK <--- DPSK ACQ OK (T = 7 ms + RTT) ISS
ITU-R M.798 DPSK_ACQ <---!CS DPSK_ACQ <--- DPSK_ACQ <--- ISS ( ms = T) DPSK ( ms = T) DPSK ( ms 8 = T) DPSK DPSK_ACQ <--- DPSK ACQ OK (T = 7 ms + RTT + 8 ms) CS (ms 67 ) OFDM - ISS OFDM - IRS ( ( ( ( ) ACK ) ACK ) ACK ) ACK ISS.ISS OFDM IRS.CS IRS OFDM. OFDM ISS IRS CS CS DPSK_ACQ <--- (T = ms) IRS <--- DPSK DPSK ACQ OK (T = 7 ms + RTT) ---> ISS
CS ITU-R M.798 ( 67 ) OFDM - ISS <--- (T = ms) OFDM!OFDM IRS (T = 67 ms) OFDM <--- DPSK ACQ OK (T = 7 ms + RTT + 8 ms) ---> CS <--- (T = 5 ms) OFDM ( 5 + RTT OFDM - IRS + 8) OFDM ---> ( ( ( ( ) ACK ) ACK ) ACK ) ACK
ITU-R M.798.. x (m, n) N log(m)*l*n x (n).x (m, n) log(m)*l N.M = x (m, n) N L N (L + S) S.x 5 (m, n) (IFFT) x 6 (m, n).x 6 (m, n) (N + P) (L + S) P.fs x 7 (m, n) fs x 9 (n).x 8 (m, n) R.(L + S)*(N + P).fs x (n) (L + S)*(N + P)*R..(D/A) x (n) IFFT PSK (Hz) N P M L R S Fs
ITU-R M.798 OFDM log ( M)* L*N bits log ( M)* L by N bits log ( M)* L by N bits L by N symbols L por N symbols ( L + S) by N symbols x () n Frame format Insert synch Bit to sequence of Scramble symbol Differenial size S mapping encode symbols S x ( m, n ) x ( m, n) x ( m, n) x 5 ( m, n) x 6 ( m, n) ( L + S) by N ( L + S) by N ( L + S) by ( N + P ) ( L + S)*( N + P ) ( L + S)*( N + P)* R symbols samples samples samples samples Add cyclic N point extension complex IFFT of length N symbols x6 m n x 7 ( m, n) x 8 ( m, n) Fs N fs= R N + P (complex) Parallel to serial conversion x9 () n Interpolate x () n Upconvert x n ( fc = 7 Hz) R by R x (n) Fs fs= R (complex) fs = 8 Hz (complex) () x (n) fs = 8 Hz (real) 798-
5 ITU-R M.798.Hz 7 Hz db.8 M PSK. 6 6 6 = N (N) CODEC.Hz = R.kHz 8 = Fs. Hz 666,66 = /8. = M = N Fs 8 8 8 8 8 8 S 8 8 R L short 6 8 6 8 L long 88 7 88 7 M 8 8 8 P 8 8 N 6 6 6 6 = N.N 6.. OFDM = M = N 8 7,7 9 6 68 76 ( / ) (Fs) (N) IFFT ( ) (P) (R) (L) (S) (M) ( / ) IFFT IFFT
= M = N 666,6667,998 6,66 8, 6,7,,9 6 876,5,65955 ITU-R M.798 6 ( ) (S) (L) ( / ) ( ) (bit/s) ( / ) ( ) ( ) ( ) (bit/s).hf ( ) P. 6 Hz 8 = Fs (ITU-R F.5 ).( = P),5 = N..ITU-R F.5 HF OFDM. 6 ( / ) ( / ) ( / ) (M) (P) FFT (N) 67,7 6, 88, 76,5 57,8 96,6 8 59,6 8, 56,9 6 DATAPLEX ARQ OFDM. S L.6.ARQ
7 ITU-R M.798 (η) ARQ :. () η= T f T f + τ+ T p + T a. :T f :τ :T p :T a : η. η. ARQ : P f () η= Pf ( T + T ) + ( T + τ+ T + T ) f Pf T f.() () = P f. T.P f T f T a T p τ T ARQ. = S 8 = L 6 = N.6 = N ( ) 6 = N = N = τ. 7 = T a. 65 DATAPLEX. T p R b 6 = N = M Hz 666,6 = fs :.R b = log (M)*fs/N = 8, Hz () () (5) b b f N = R T P = P N f e f b p a : :. P e T = T f + Ta.P e T f η ().,,,5,, = P e.dataplex.,998 = N = L., = P e,998 +τ
ITU-R M.798 8 OFDM ARQ.9.8.7 Utilization factor.6.5.... 5 6 7 8 9 P e =. P e =. P e =.5 P e =. P e =. Frame length (s) (INFORMATION) (SEQ_NUM) 6 6. 8 = M. 6 ( ) log (M)*L*N. = M.( ) log (M)*L N ().(). 6 DATAPLEX. 6 6 5 (6) x + x + x +. 6 6 6... 798-
9 ITU-R M.798 = M ( ) () SEQ_NUM () () ( ) () SEQ_NUM () () () SEQ_NUM () () (n) SEQ_NUM ( n) ( n)..dataplex (IRS) IRS OFDM. 8 IRS DATAPLEX. = M.DATAPLEX IRS 6 ( ) ( ) = M () IRS () IRS () IRS ( ) ( ) ( ) 798- (6) IRS ( ). 6 OFDM. N OFDM. 798-
ITU-R M.798.. : + x + x 7 (7).5 d s (nt) = d(nt) XOR d s ((n )T) XOR d s ((n 7)T XOR -7 5. 6. 8 /... = M Q I.5 6. = M π/.. 5 = M π/ π/ π Q I x b
ITU-R M.798 6 = M (8) : ψ( n) = [ ψ( n ) + ϕ( n) ] mod π ϕ(n) ψ(n). = M [π/ π π/ ].5 N S..IFFT OFDM. OFDM... FFT.. (9) (IFFT) (IFFT) : IFFT..OFDM x( n) = N N k= X ( k) e jπnk / N ; n =,,,... N IFFT. x(n) X(k) IFFT N.N N : IFFT. N (L + S)
ITU-R M.798 () Fs N fs= R N + P P IFFT HF.IFFT P P.. = N 8 = P (N + P).7.Hz 666,67 = 8 / = Fs/R (L + S) 7. L + S N + P Hz 666,67 FIR.D/A.Hz 8 8. = R.. 9. 8 = N Spectrum response, Interpolate, N =.5 = N Impulse response, Interpolate, N =..5..5. 5.5 6 7.5 8 5 5 5 5. 5 5 5 5 798-8
ITU-R M.798 9 ( ) (Baseband modulator signal spectrum) Magnitude (db) (db) 5 6 5 6 Frequency (Hz) (Hz) 798-9. Hz 7 = f c..ofdm. D/A Complex baseband signal cos( fnf / s) Real passband signal sin( fnf / s) 798-
ITU-R M.798 5 Magnitude (db) (db) 5 5 Hz 8 y (n) A/D. y (n) (L + S)*(N + P)*R f. y (n) y (n). τ r L y (n) (L + S)*(N + P) R.y (m, n) (N + P) : y 5 (m, n) N L." " " " () 5 5 5 5 5 Frequency (Hz) (Hz) Fs N fs= R N + P.y 6 (m, n) N L y 5 (m, n) FFT..N.. y 7 (m, n) log (M)*L by N.y 8 (m, n) log (M)*L by N..y 9 (n) log (M)*L*N 798-
5 ITU-R M.798 ( L + S)*( N + P)* R samples DPSK ( L + S)*( N + P) L by ( N + P) samples symbols Fs N fs = R N + P (complex) fs = 8 Hz (real) y ( n ) Downconvert Decimate ( fc = 7 Hz) by R y ( n ) R y ( n) Serial to parallel and remove synch Remove cyclic prefix y ( m, n ) y 5 ( m, n) f Timing and frequency recovery r L by N symbols L by N symbols log ( M*L ) by N bits log ( M*L ) by N bits log ( M*L*N ) bits IFFT N point complex NIFFT Differential detector Descramble Parallel to serial y6 ( m, n ) y7 ( m, n ) y 8 ( m, n) y9 ( n ) N: IFFTlength P: extension length M: order PSK of PSK L: number of parallel symbols in burst R: interpolate rate S: number of synch symbols 798-
ITU-R M.798 6. Hz 8 f s Hz 7 = f.f + f.. f : Hz = *f Real baseband signal cos( ( f f ) n/ fs) Complex baseband signal sin( ( f f ) n/ f ) s 798-5 Magnitude (db) (db) 5 5 5 5 6 Frequency (Hz) (Hz) 798-
7 ITU-R M.798 Hz 8 = R. 666,67 = /8. Hz. 5 5 Magnitude (db) (db) 5 6 5 6 Frequency (Hz) (Hz) 798-5. OFDM.. / 8, / 666,7. / 6. 8 /6..Hz OFDM.Hz 5±.. OFDM.(SC) OFDM (BER)
ITU-R M.798 8.(AWGN). () () D ln ln F E πn R N F π R s OFDM SC. R Hz F OFDM N.E s /N S/N D ln ln β E πn 6 R N 6 β E π R N s s OFDM SC : θ β () σ θ = πβ.m-qam M-PSK 6.dB E -DPSK s /N.N. OFDM 6 OFDM ( E / N = db, R = 666.6667) s Degradation (db) D D (db) 8 6 5 6 7 8 9 N = 6 N = N = 6 Frequency (Hz) offset (Hz) 798-6
9 ITU-R M.798.OFDM N.(L + S)*(N + P).L by (N + P).L by N L by (N + P) (FFT) (FFT) : (FFT) ( ) jπnk / N (5) X k = x( n)e k =,,,... N n=. X(k) x(n) FFT N.N N FFT : FFT. (L by N) (6) Fs N fs= R N + P PSK..DPSK (7) ϕ k = ϕ k : + ϕ k : r k. Re { r j k r ϕˆ } k ˆ ϕ k k * e. M = -PSK. BER BER AWGN. j ϕˆ ˆ { e k j ϕ r r e * + r r k * + k } Re * k k k k : j ( ϕ ˆ + ϕ ˆ r e k ) φˆ kr k ˆ ϕ k k.
(8) ITU-R M.798. 6 M M = -PSK : d(nt) = d s (nt) XOR d s ((n )T) XOR d s ((n 7)T) (XOR) -7.7 7..log(M)*L*N log(m)*l by N. 6 (9) () : x 6 + x + x. ALE MiL......"free signals".( ) 5 +
ITU-R M.798....(8 )..% 65 6 55 5 5 8 Channel (%) utilization (%) 5 5 5 5 July- 5 January-5 5 July-5 5 December-5 798-8 Pactor-III - (GLN). KJD.( ) khz
ITU-R M.798 :.PACTOR-III HF... / 5 T-BUS T-BUS T-BUS. () "Sailor" "Skanti"."Skanti". T-BUS..T-BUS RS-.PTC-II (NBDP). - ) PACTOR-III ( SCS GmbH & Co. KG.. ARQ PACTOR-III PACTOR-II PACTOR-I. PACTOR-III. FSK (PACTOR-I). Hz 5 PACTOR-II PACTOR-I PACTOR-III. Hz 8. 7, / 6. / / 5 PACOTR-III.PACTOR-II.PACTOR-II.KJD PACTOR-III.
ITU-R M.798 (SLs) 6 PACTOR-III. (bauds)..(hz 6 ) khz,. Hz 8 Hz 8 " ".Hz 5 N.Hz 5 9. Hz. PACTOR-II. ARQ 9 6 7.5 8 7 6 5 PACTOR-II 5.( ) 9 CN 5 6 7 8 9 5 6 7 SL.. x x 5 6 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x TF 8 6 7 8 96 8 56 68 8 9 6 8 5 CN: TF: x: channel number tone (Hz) frequency (Hz) indicates that the tone is used in the perspective SL 798-9.(DQPSK) PSK (DBPSK) PSK 7 (CL) / 8/9 / PACTOR-II.9. / " " :./ " ". "" "" ""..
ITU-R M.798 " ".. " " 8/9 / (/ ) SCS... Viterbi (CR) (CL) (NDR) (PDR). (CF). (DBPSK/DQPSK) (8-).(E b /N ). S/N.kHz (BW) SL6.S/N.dB (SL) (CL) (CR) (db) CF ARQ (bit/s)..
5 ITU-R M.798
ITU-R M.798 6 S/N (CF) PACTOR-III. PACTOR-III. S/N OFDM CF SL6 SL5 CF SL. OFDM CF db OFDM (DRM) OFDM (/ ) OFDM (/ ). :. ( db OFDM MLSE ) DFE.(.. (
7 ITU-R M.798 PACTOR-III. DFE. CF SCS.. S/N.CF. ( ),75 ( ),5 ARQ. PACTOR ARQ PACTOR-III. ), ( ), ARQ. (.(PACTOR-I ) FSK PACTOR-III..PACTOR 5 8 6 :. :. 6 5 modulo-. "" "" :. ( 5 ) 5.. 6... 8- -6 -.6 5 ARQ.
(8- -6 - ITU-R M.798 8 ) 8 59 5. 76 956 556 76 6 6.. ) ( ) (5 ) (.(7 ) (6 ).CCITT-6 6. (CS) PACTOR-III 5.PACTOR-II. "Plotkin". CS CS. : CS5 CS. CS / (NAK) CS5. CS CS6... DBPSK.PACTOR-III ARQ 5 PACTOR-III PACTOR.( PMC) (ISS). ASCII PACTOR-III.... 7..
9 ITU-R M.798. ""..PACTOR-I PACTOR H DATA CS (,),5 : 5 PACTOR-III ARQ ( 5 ) 8 ( ).ARQ H DATA CS QRG :H. 5 CS. (,),75 :(DATA ) : : : Viterbi 6 DATA S :DATA DATA: In the speed levels,,,, 5 and 6, the sum of the 59 usable bytes transferred in the data fields of all used 5 tones are 5,, 59,,, and 8 in the normal 556 76 6 cycle, 6 and 6, 6, 76, 8 556, 956 and 76 in the long. cycle, respectively. 76 956 : CCITT : 6-bit CCITT cyclic. redundancy 6 check. 8 ( ) (" " ) ASCII = = = = PMC = = = = Modulo- : ( ) ( ) PMC ( ) PMC ( ) PMC QRT : : S : 7 6 5 798-5. "s" "i" "e".."x" :.. ASCII. (PMC). " " 6 PMC.... PACTOR-III PACTOR-II. ASCII,9 PMC
ITU-R M.798 5 "x". "".. ASCII "x" "x7f" "x6" "xf" "x"."x6" "x"."xd x x68" "AAAAAAAA". "x6" 8.. FSK PACTOR SCS PACTOR-II.Hz 8± DPSK.. PACTOR-III SCS. "".PACTOR-III " ". "" "" FSK " ".PACTOR-III " ". PACTOR-III " " SCS. PACTOR-III " " Hz 6 FSK "".PACTOR-III Hz 5 PACTOR-III SC6 PACTOR-III 6. 8 9.. ARQ ARQ ARQ- PACTOR-III. ARQ-.. (AWGN) 7. SL S/N.CF db S/N SL6 / 7.dB,8 SL SL CF.SL6 db 8 S/N.7 SL
5 ITU-R M.798 6 8 SL6 PACTOR-III 5 5 5 Spectrum (db) (db) 5 5 5 5 5 Frequency (Hz) (Hz) 5 5 798-6 7 7 PACTOR-III Throughput (bit/s) ( / ) 5 5 5 5 (db) khz S/N with respect to SL SL at BW = khz S/N (db) AWGN poor channel 798-7
ITU-R M.798 5 8 BER (BER) 5 6 8 (db) E E b / N /N (db) SL SL/SL/SL SL5 SL6 798-8 9 8 SL6 PACTOR-III 5 5 5 Spectrum (db) (db) 5 5 5 5 5 Frequency (Hz) (Hz) 5 5 798-9
5 ITU-R M.798 (T-BUS). : Remote Terminal Addr. : (*
ITU-R M.798 5 Frequency input: : (GLN) (CRSs). (NBDP)..
55 ITU-R M.798.. (CRS) CRS.. CRS.. (PIB).Pactor IP-Bridge (PIB) K TCP/IP (PIB). Linux OS./ 56. (NCC).CRS. NCC. NCC.GLN (CRS) CRS (FTP). CRS. CRS.(NCC)... CRS. CRS. (baud) FSK... CRS (SES) CRS SES.CRS GLN SES. GLN. MF/HF
ITU-R M.798 56.(GMDSS)... CRS. CRS ADSL SDSL. Wi-Fi ISDN..kbit/s. GLN GLN GLN..(NCC) SES CRS..
57 ITU-R M.798 LDAP server (author) ( ) GLN Radio server RF RF modem Tx Tx Mail server Database Backup and compression Internet Radio server CRS CRS RF RF modem Tx Tx SES (SES) NCC (NCC) Interfacing MRCC CES (CES) ITU database CRS n n SES (SES) :MRCC MRCC: maritime rescue coordination centre 798- GLN S/N PIB... GLN. GLN..SES GLN."grip"
ITU-R M.798 58 NCC SES. NMEA 8. 55. CRS (SSAS). SSAS Internet services MRCC MRCC SSAS SSAS Other networks Special services Radio server RF RFmodem Tx Tx CRS (CRS) Ship server RF RFmodem GSM Tx Tx SES (CRS) Fleet SSAS terminal GPS GMDSS terminal Network client Network client 798-
59 ITU-R M.798.. GLN...,5,75 GLN (6 ) MHz MHz 8 MHz 6 ( - 6 ) MHz 7 MHz MHz 8 MHz 6 MHz 9 MHz 7 MHz MHz 8 MHz 6 MHz MHz 7 MHz MHz 8 MHz 6 MHz 5 MHz 7 MHz MHz 8 MHz 6 MHz 5 MHz 7 MHz MHz 8 MHz 6 MHz 5 MHz 7 MHz MHz 8 MHz 6 MHz 5
MHz MHz 8 MHz 6 MHz MHz MHz 8 MHz 6 MHz MHz MHz 8 MHz 6 ITU-R M.798 6 MHz 7 MHz MHz 8 MHz 6 MHz 5 MHz 7 MHz MHz 8 MHz 6 MHz 5 MHz 5 5 5 MHz 7 MHz 7.MHz 7