1、CEHELEC EN*bU35-3- LO 94 3404583 OL588b7 44T BRITISH STANDARD Methods of measurement for equipment used in digital microwave radio transmission systems Part 3. Measurements on satellite earth stations Section 3.10 Terminal equipment - TDMA traffic earth station The European Standard EN 60835-3-10 :
2、1994 has the status of a British Standard UDC 621.396.6 : 629.783 : 621.317.08 BS EN 1995 BS 7573 : Section 3.10 : 1995 1994 60835-3-10 : IEC 835-3-10 : CENELEC EN+b0835-3- LO 94 m 3404583 OLSBBb8 38b m BS EN 60835-3-10 : 1995 15 August 1995 Amd. No. Date O BSI 1995 Committees responsible for this B
3、ritish Standard ixt affected The preparation of this British Standard was entrusted to Technical Committee EPU12, Radio communication, upon which the following bodies were represented: British Broadcasting Corporation British Radio and Electronic Equipment Manufacturers Association British %lecommun
4、ications plc ERA ichnology Ltd. Institution of Electrical Engineers Radio, Electrical and Television Retailers Association Radiocommunications Agency The following BSI references relate to the work on this I l standard: Committee reference EPU12 Draft for comment 91130989 DC ISBN O 580 24399 O I l C
5、ENELEC EN*bO835-3- LO 94 3404583 OL58869 212 W BS EN 60835-3-10 : 1995 Contents page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 60835-3-10 3 CENELEC EN*bO835-3- LO 94 3404583 0158870 T34 = BS EN 60836-3-10 : 1995 National foreword This British Standard has b
6、een prepared by Technical Committee EPL/l2 and is the English language version of EN 60835-3-10 : 1994 Methods of mewrmnt for equipment used in digital microwave radio transmission systems Part 3: Measurements on satellite earth stations Section 3.1 O: himl equipment - TDMA traffic earth station, pu
7、blished by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 835-3- 10 : 1994, published by the International Electrotechnical Commission (IEC). BS EN 60835 is published in three Parts. The other Parts are: Part 1 Measurements common to terrestrial radio
8、-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. This Section of BS EN 60835 covers methods of measurement for Time Division Multiple Acce
9、ss (TDMA) terminal equipment used in many international and regional traffic earth stations. Additional information In adopting the text of the international standard the typographical errors listed below were discovered. In the Introduction, paragraph 2, the abbreviation TIM for “krrestrial Interfa
10、ce Modules should read TIE for consistency with later references to it. In the figures, the abbreviation TIE refers to the synonymous term Terrestrial Interface Equipment text.) Cross-references international standard EN 60835-1-2 : 1993 (IEC 835-1-2 1992) IEC 835-1-4 : 1992 (The term Equipment is u
11、sed throughout in the French Corresponding British Standard BS EN 60835 Methods of meclsurement for equipment used in digital microwave radio transmission systems Part 1 Measurements common to terrestrial radio-relay systems and satellite earth stations. Section 1.2 : 1995 Basic characteristics BS 7
12、573 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 1.4 : 1993 lYansmission23erformance Compliance with a British Standard does not of itself confer immunity f
13、rom legal obligations. ii EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60835-3-10 October 1994 UDC 621.396.6 : 629.783 : 621.317.08 Descriptors: Radiocommunications, telecommunications, communication equipment, telecommunication terminals, earth stations, satellite broadcasting, digital tech
14、nics, radio-relay systems, microwave frequencies, measurement, characteristics English version Methods of measurement for equipment used in digital microwave radio transmission systems Part 3: Measurements on satellite earth stations Section 10: Terminal equipment - TDMA traffic earth station (IEC 8
15、35-3-10 1994) Mthodes de mesure applicables au matriel utilis pour les systmes de transmission numrique en hyperfrquence Partie 3: Mesures applicables aux stations terriennes de tlcommunications par satellite Section 10: Equipement terminal Station MeBverfahren fr Gerte in digitalen Mikrowellen-Funk
16、bertragungs-systemen Teil 3: Messungen an Satelliten-Erdfunkstellen Hauptabschnitt 10: Endeinrichtung-Erdfunkstelle fr TDMA-Betrieb terrienne de trafic AMRT (CE1 835-3-10 : 1994) (IEC 835-3-10 : 1994) This European Standard was approved by CENELEC on 1994-03-08. CENELEC members are bound to comply w
17、ith the CENXENELEC 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 national standards may be obtained on application to the Central Secretar
18、iat 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 language and notified to the Central Secretariat has the same status as the
19、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, Switzerland and United Kingdom. CENELEC European Committee for Electrotec
20、hnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels O 1994 Copyright reserved to CENELEC members Ref. NO. EN 60835-3-10 : 1994 E CENELEC ENxbO835-3- LO 94 W 3404583 0158872 80
21、7 Page 2 EN 608353-10 : 1994 Foreword The text of document 12(C0)148, as prepared by Subcommittee 12E, Radio-relay and fixed satellite communication systems, of IEC Technical Committee 12, Radiocommunications, was submitted to the IEC-CENELEC parallel vote in May 1993. The reference document was app
22、roved by CENELEC as EN 60835-3-10 on 8 March 1994. The following dates were fixed: - latest date of publication of an identical national standard (dop) 1995-07-01 - latest date of withdrawal of conflicting national standards (dow) 1995-07-01 Annexes designated normative are part of the body of the s
23、tandard. In this standard, annex ZA is normative. Page 3 EN 60835-3-10 : 1994 CONTENTS Paw 2 FO R E WOR D . INTRODUCTION 4 Clause Scope . Normative references . I.F. interface characteristics 3.1 Return loss . 3.2 3.3 Carrier on-off ratio 3.4 Phase and amplitude balance . Terrestrial interface chara
24、cteristics 4.1 Level and shape of the output signal 4.2 Other parameters Bit error ratio . 5.1 General consideration . 5.2 Modem BER performance . 5.3 Overall system BER performance Frame acquisition and synchronization . 6.1 General considerations . 6.2 Clock frequency and acquisition time 6.3 Rece
25、ive frame acquisition and synchronization . 6.4 Transmit frame acquisition 6.5 Transmit frame synchronization . 6.6 Synchronization characteristics with additive noise System control functions . 7.1 General considerations . 7.2 Reference station changeover test 7.3 Burst Time Plan and/or Channel Map
26、ping Plan change test Level. frequency and spectrum of the modulator output signal 7.4 Other monitor and control function tests. including service channels . 5 5 6 6 6 6 6 7 7 7 8 8 8 10 10 10 11 11 12 13 14 14 14 14 15 15 Figures 1 Typical TDMA terminal equipment used in a traffic earth station . 2
27、 Typical arrangement for modem BER measurement . 16 16 3 Typical arrangement for overall system BER test . 17 4 Typical arrangement for frame acquisitionlsynchronization test . 18 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant Europe
28、an publications 19 CENELEC EM*bCt835-3- LO 74 m 3404583 0158874 b8T W Page 4 EN 608353-10 : 1994 INTRODUCTION In a TDMA (Time Division Multiple Access) satellite communication system, the reference earth station transmits the reference burst which provides a timing reference to the traffic (non-refe
29、rence) earth stations. In many TDMA systems, the reference earth station monitors the operation of the traffic earth stations, and controls them in case of a burst plan change, etc. Usually, at least two reference earth stations are included in a TDMA system for redundancy purposes. A block diagram
30、of typical TDMA terminal equipment for a traffic earth station is shown in figure 1. This section deals mainly with the method of measurement for the TDMA terminal used in traffic earth stations. It consists of PSK modulator/demodulator (PSK modem), Common TDMA Terminal Equipment (CTTE) and one or m
31、ore Terrestrial Interface Mod- ules (TIM). The PSK modem interfaces with the earth station r.f. equipment at an inter- mediate frequency of typically 70 MHz or 140 MHz, and the TIE interfaces with the terrestrial digital circuits. The CTTE processes the transmit data from the TIE, produces transmit
32、bursts, processes received bursts and sends recovered data to the TIE. It also controls the acquisition and synchronization functions. Special measuring equipment specific. to the system, such as the reference burst generators, the burst negator, the burst mode bit error ratio measuring set, etc., m
33、ay sometimes be required for measurement of the TDMA terminal equipment. They may be provided by the manufacturer of the TDMA equipment if they are not commercially available. The TDMA terminal equipment is usually provided with various built-in monitoring func- tions with indicators and/or displays
34、. In some cases, the tests are performed using these monitoring functions. Because different system designs may exist for some TDMA systems, some of the methods of measurement described here may be inappropriate, or at least the detailed procedures may be different. Therefore, it is necessary to con
35、sult the responsible system operator and/or the equipment manufacturer, before beginning the measurements. Some performance characteristics may be affected by the satellite round-trip delay time. These effects can usually be evaluated only by on-site tests which are outside the scope of this section
36、. CENELEC EN*b0835-3- LO 94 3404583 0158875 5Lb Page 5 EN 608353-10 : 1994 METHODS OF MEASUREMENT FOR EQUIPMENT USED IN DIGITAL MICROWAVE RADIO TRANSMISSION SYSTEMS - Part 3: Measurements on satellite earth stations - Section 10: Terminal equipment - TDMA traffic earth station 1 Scope This section d
37、eals with methods of measurement on Time Division Multiple Access (TDMA) terminal equipment. There are various type of TDMA systems which may differ, for instance, in the bit rate, the frame/burst format, and/or the acquisition and synchronization scheme. In this section, the methods of measurement
38、are described as generally as possible so that they may be applicable to various TDMA terminal equipment used in many interna- tional and regional satellite systems. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisio
39、ns of this section of IEC 835-3. At the time of publication, the editions indicated were valid. All normative documents 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 norm
40、ative documents indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. 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 sa
41、tellite earth stations - Section 2: Basic 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 systems and satellite earth stations - Section 4: Transmission performance
42、. Page 6 EN 60835-3-10 : 1994 3 I.F. Interface characteristics 3.1 Return loss The return loss of the modulator output port and the demodulator input port should be measured according to IEC 835-1-2. The modulator is operating continuously. 3.2 Refer to IEC 835-1-2. Level, frequency and spectrum of
43、the modulator output signal The level and the spectrum of the modulator output signal should be measured by operating the modulator continuously with a pseudo-random binary sequence (p.r.b.s.) present at the modulator input. If required, the spectrum should also be measured in the burst mode. The fr
44、equency of the modulator output signal should be measured in the continuous mode with no modulation (CW mode). 3.3 Carrier on/off ratio 3.3.1 Method of measurement Connect a spectrum analyzer to the output port of the modulator and measure the level of the carrier signal with the modulator output on
45、 and off. The on-off ratio is the difference of the two levels in decibels. 3.3.2 Presentation of results The results should be presented in decibels. 3.3.3 Detail to be specified The following item should be included, as required, in the detailed equipment specif ication: a) minimum required on-off
46、 ratio. 3.4 Phase and amplitude balance This measurement is usually carried out for QPSK modulators. 3.4.1 Method of measurement Connect vector voltmeter probes to the modulated carrier output port and to the un- modulated carrier monitor port, if available. Apply static binary symbols (00,01,11 ,lo
47、) to the I/Q baseband input port in sequences, and measure output carrier phase/amplitude related to unmodulated carrier for each state. instead of the vector voltmeter, a constellation analyzer using the above principle can also be applied. CENELEC ENsb0835-3- LO 9id m 3404583 0358877 399 m Page 7
48、EN 608353-10 : 1994 3.4.2 Presentation of results The results should be presented by stating the difference between the measured and ideal values for the four individual states: a) in degrees for the phase unbalance, and b) in decibels for the amplitude unbalance. 3.4.3 Details to be specified The f
49、ollowing items should be included, as required, in the detailed equipment specification: a) maximurq permitted phase unbalance between the phase states relative to an ideal value; b) maximum permitted unbalance for the phase states. 4 Terrestrial interface characteristics 4.1 Level and shape of the output signal 4.1 .I Method of measurement Drive an appropriate input port of the TIE by a suitable p.r.b.s. generator. The applied sig- nal should be looped back at an appropriate point (digital or i.f. loopback) so that a bit stream is o
