《BS-EN-60835-3-9-1995 BS-7573-3.9-1995 IEC-60835-3-9-1993.pdf》由会员分享，可在线阅读，更多相关《BS-EN-60835-3-9-1995 BS-7573-3.9-1995 IEC-60835-3-9-1993.pdf（24页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS EN 60835-3-9:1995 BS 7573-3.9: 1995 IEC 835-3-9: 1993 Methods of measurement for equipment used in digital microwave radio transmission systems Part 3: Measurements on satellite earth stations Section 3.9 Terminal equipment SCPC-PSK The European Standard EN 60835-3-9:1995 has the
2、 status of a British Standard ICS 33.060.30 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:29:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60835-3-9:1995 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the au
3、thority of the Standards Board and comes into effect on 15 December 1995 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference EPL/12 Draft for comment 91/22367 DC ISBN 0 580 24962 X Committees responsible for this British Standard The preparation of this
4、British Standard was entrusted to Technical Committee EPL/12, Radio communication, upon which the following bodies were represented: British Broadcasting Corporation British Radio and Electronic Equipment Manufacturers Association British Telecommunications plc ERA Technology Ltd. Institution of Ele
5、ctrical Engineers Radio, Electrical and Television Retailers Association Radiocommunications Agency Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:29:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60835-3-9:1995 BSI 01-2000i Co
6、ntents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN 60835-3-93 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:29:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60835-3-9:1995 ii BSI 01-2000 National forewor
7、d This British Standard has been prepared by Technical Committee EPL/12 and is the English language version of EN 60835-3-9:1995 Methods of measurement for equipment used in digital microwave radio transmission systems Part 3: Measurements on satellite earth stations Section 3.9 Terminal equipment S
8、CPC-PSK, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 835-3-9:1993, published by the International Electrotechnical Commission (IEC). BS EN 60835 is published in three Parts. The other Parts are: Part 1: Measurements common to terrestri
9、al radio-relay systems and satellite earth stations; Part 2: Measurements on terrestrial radio-relay systems. Some of the many Sections of the three Parts have appeared under the number BS 7573, of the same generic title. When using this British Standard, reference is required to BS EN 60835-1-1.2,
10、BS EN 60835-1-1.31) and BS EN 60835-1-1.41). This Section of BS EN 60835 covers methods of measurement on Single-Channel-Per-Carrier, Phase-Shift-Keying, (SCPC-PSK) terminal equipment using pulse code modulation (PCM) encoding. The terminal can be used in a pre-assigned mode or be integrated in a De
11、mand Assignment Multiple Access (DAMA) network. The methods described are applicable to SCPC-PSK equipment used in international satellite systems and most of the methods are also applicable to systems used in domestic or regional satellite systems. A British Standard does not purport to include all
12、 the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and
13、ii, the EN title page, pages 2 to 18, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) In preparation. Cross-references Publication referred
14、 toCorresponding British Standard BS EN 60835 Methods of measurement for equipment used in digital microwave radio transmission systems. Part 1 Measurements common to terrestrial radio-relay systems and satellite earth stations EN 60835-1-2:1993 (IEC 835-1-2:1992) Section 1.2:1995 Basic characterist
15、ics EN 60835-1-3:1995 (IEC 835-1-3:1992) Section 1.3:1995 Transmission characteristics1) EN 60835-1-4:1992 (IEC 835-1-4:1992) Section 1.4:1995 Transmission performance1) Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:29:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME
16、 EUROPENNE EUROPISCHE NORM EN 60835-3-9 January 1995 ICS 33.060.30 Descriptors: Telecommunications, radiocommunications, communication equipment, earth stations, microwave frequencies, digital technics, measurements, characteristics English version Methods of measurement for equipment used in digita
17、l microwave radio transmission systems Part 3: Measurements on satellite earth stations Section 9: Terminal equipment SCPC-PSK (IEC 835-3-9:1993) Mthodes de mesure applicables au matriel utilis pour les systmes de transmission numrique en hyperfrquence Partie 3: Mesures applicables aux stations terr
18、iennes de tlcommunications par satellite Section 9: Equipement terminal SCPC-MDP (CEI 835-3-9:1993) Meverfahren fr Gerte in digitalen Mikrowellen-Funkbertragungssystemen Teil 3: Messungen an Satelliten-Erdfunkstellen Hauptabschnitt 9: SCPC-PSK-Endgerte (IEC 835-3-9:1993) This European Standard was a
19、pproved by CENELEC on 1994-12-06. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such n
20、ational standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own lang
21、uage and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, S
22、witzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1995 Copyright reserved to CENELEC members Ref. No.
23、 EN 60835-3-9:1995 E Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:29:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60835-3-9:1995 BSI 01-2000 2 Foreword The text of the International Standard IEC 835-3-9:1993, prepared by SC 12E, Radio-relay and fixed satellite communications systems
24、, of IEC TC 12, Radiocommunications, was submitted to the formal vote and was approved by CENELEC as EN 60835-3-9 on 1994-12-06 without any modification. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Anne
25、x ZA has been added by CENELEC. Contents Page Foreword2 Introduction3 1Scope3 2Normative references3 3PCM channel codec4 3.1Idle channel noise level4 3.2Total distortion including quantizing distortion4 3.3Audio amplitude/frequency characteristics5 3.4PCM coder overload point5 3.5Audio intermodulati
26、on products5 3.6Audio spurious output components5 4I.F. sub-system characteristics5 4.1Frequency accuracy and stability5 4.2Transmit i.f. spurious signals5 4.3I.F. intermodulation products6 4.4A.F.C. pull-in range and a.g.c. characteristics6 4.5I.F. amplitude/frequency characteristics8 4.6I.F. retur
27、n loss characteristics8 5Bit-error-ratio (BER)8 Page 5.1Continuous mode BER8 5.2Voice burst mode BER8 5.3Overall system performance with interference8 6Cycle-skipping performance9 6.1Definition and general considerations9 6.2Method of measurement9 6.3Presentation of results10 6.4Details to be specif
28、ied10 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications18 Figure 1 Example of an SCPC-PSK terminal functional block diagram11 Figure 2 Typical arrangement for measuring PCM channel codec performance12 Figure 3 Test
29、 arrangement for measuring the signal-to-total distortion ratio12 Figure 4 Typical arrangement for measuring a.f.c. and a.g.c. functions13 Figure 5 Typical arrangement for measuring BER performance (voice mode)14 Figure 6 Typical arrangement for measuring BER performance (data mode)15 Figure 7 Typic
30、al arrangement for measuring BER performance with interference (data mode)16 Figure 8 Typical arrangement for measuring cycle-skipping performance (direct method)17 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement(
31、dop) 1995-12-01 latest date by which the national standards conflicting with the EN have to be withdrawn(dow) 1995-12-01 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:29:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60835-3-9:1995 BSI 01-20003 Introduction A block diagram of a typical
32、 SCPC-PSK terminal is shown in Figure 1. The terminal may be divided into two portions; the channel units and the intermediate frequency (i.f.) sub-system. The channel units accept voice or data signals and modulate i.f. carriers, and vice versa. Only one voice or data channel is processed by a chan
33、nel unit. Therefore, numbers of channel units, the number depending on the traffic requirements, are usually installed in an earth station. The channel units for voice and data are different. For example, on the transmit-side, a channel unit for voice accepts a voice signal and converts it to a PCM
34、signal at 56 kbit/s. A voice detector is provided to detect the existence of the voice signal and to radiate a carrier only while the voice signal is active. The output carrier therefore becomes a stream of short bursts. A channel synchronizer (transmit-side) attaches a preamble word at the beginnin
35、g of each burst and inserts frame synchronizing words at specified intervals. The output signal of the channel synchronizer, e.g. 64 kbit/s, is applied to a PSK modulator where biphase or quadriphase phase shift keying modulation is performed on the carrier. The output carrier frequency is controlle
36、d by a transmit frequency synthesizer. On the receive-side, the received, PSK-modulated i.f. carrier is selected by a receive frequency synthesizer and demodulated by a PSK demodulator. The demodulated PCM signal, e.g. 64 kbit/s, is applied to a channel synchronizer (receive-side), and word synchron
37、ization is achieved. The voice signal is then recovered by a PCM decoder. In the case of a channel unit used for data signals, an incoming data signal, e.g. at a bit-rate of 48 kbit/s or 56 kbit/s, is scrambled and combined with additional bits for error correction in a data encoder. The encoded sig
38、nal, e.g. 64 kbit/s, is then applied to a PSK modulator which is the same as that used for voice signals. On the receive-side, the recovered signal from the PSK demodulator is applied to a data decoder, where correct code synchronization is recovered and error correction is performed. The output sig
39、nal of each PSK modulator is applied to an i.f. combiner in the i.f. sub-system and combined with each other. A reference pilot signal is also combined in the case of the reference earth station. The combined i.f. signal is amplified and sent to the up-converter in the earth station i.f./r.f. equipm
40、ent. The received i.f. signal from the down-converter is first applied to automatic frequency control (a.f.c.) and automatic gain control (a.g.c.) circuits, where any frequency inaccuracy arising from the local oscillators of the satellite transponder and/or earth station i.f./r.f. equipment is corr
41、ected using the reference pilot signal. The a.g.c. function also uses the pilot signal. The output frequency of the a.f.c. and a.g.c. circuits may differ from the input frequency because of frequency conversion during the a.f.c. function. It may also differ between manufacturers equipment. The outpu
42、t signal is then divided by an i.f. divider and applied to the PSK demodulator of the channel units. 1 Scope This section of IEC 835-3 deals with methods of measurement on Single-Channel-Per-Carrier, Phase-Shift-Keying, (SCPC-PSK) terminal equipment utilizing PCM encoding. The SCPC-PSK terminal may
43、be used in a pre-assigned mode or integrated in a Demand Assignment Multiple Access (DAMA) network. The measurement methods described in this section are applicable to SCPC-PSK equipment used in international satellite systems. However, most of the methods of measurement will also be applicable to s
44、ystems used in domestic or regional satellite systems. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this section of IEC 835-3. At the time of publication, the editions indicated were valid. All normative d
45、ocuments are subject to revision, and parties to agreements based on this section of IEC 835-3 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Sta
46、ndards. IEC 835-1-2:1992, Methods of measurement for equipment used in digital microwave radio transmission systems Part 1: Measurements common to terrestrial radio-relay systems and satellite earth stations Section 2: Basic characteristics. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:
47、29:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60835-3-9:1995 4 BSI 01-2000 IEC 835-1-3:1992, Methods of measurement for equipment used in digital microwave radio transmission systems Part 1: Measurements common to terrestrial radio-relay systems and satellite earth stations Section 3: Transmis
48、sion characteristics. IEC 835-1-4:1992, Methods of measurement for equipment used in digital microwave radio transmission systems Part 1: Measurements common to terrestrial radio-relay and satellite earth stations Section 4: Transmission performance. CCITT Recommendation G.712, Performance character
49、istics of PCM channels between 4-wire interfaces at voice frequencies. CCITT Recommendation O.41, Specification for a psophometer for use on telephone type circuits. CCITT Recommendation O.131, Specification for a quantizing distortion measuring apparatus using a pseudo-random noise stimulus. CCITT Recommendation O.132, Specification for a quantizing distortion measuring equipment using a sinusoidal test signal. 3 PCM channel codec The following methods of measurement are in accordance with CCITT Recommendation