1、BSI Standards PublicationBS ISO/IEC 24769-2:2013Information technology Real-time locating systems (RTLS) device conformance test methodsPart 2: Test methods for air interface communication at 2,4 GHzBS ISO/IEC 24769-2:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementati
2、on of ISO/IEC24769-2:2013.The UK participation in its preparation was entrusted to TechnicalCommittee IST/34, Automatic identification and data capturetechniques.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to incl
3、ude all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 77539 0ICS 35.040Compliance with a British Standard cannot confer immunity fromlegal obligations.This British
4、Standard was published under the authority of theStandards Policy and Strategy Committee on 31 July 2013.Amendments issued since publicationDate Text affectedBS ISO/IEC 24769-2:2013Information technology Real-time locating systems (RTLS) device conformance test methods Part 2: Test methods for air i
5、nterface communication at 2,4 GHzTechnologies de linformation Mthodes dessai de conformit du dispositif des systmes de localisation en temps rel (RTLS) Partie 2: Mthodes dessai pour la communication dinterface dair 2,4 GHz ISO/IEC 2013INTERNATIONAL STANDARDISO/IEC24769-2First edition2013-06-15Refere
6、nce numberISO/IEC 24769-2:2013(E)BS ISO/IEC 24769-2:2013ISO/IEC 24769-2:2013(E)ii ISO/IEC 2013 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO/IEC 2013All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means,
7、 electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Te
8、l. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO/IEC 24769-2:2013ISO/IEC 24769-2:2013(E) ISO/IEC 2013 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Terms, definitions and abbreviated term
9、s 13.1 Terms and definitions . 13.2 Abbreviated terms . 24 Conformance tests for ISO/IEC 24730-2 24.1 General . 24.2 Default conditions applicable to the test methods 24.3 Tag DSSS RF transmission tests 34.4 Receiver DSSS RF tests . 54.5 Tests for optional air interfaces 7Annex A (informative) RF Te
10、st measurement site .14Annex B (normative) Message formats for tests .15Annex C (normative) Technical requirements of measurement antenna andvector signal analyser .17Annex D (normative) Technical requirements of the arbitrary waveform generator and magnetic coil 18Annex E (informative) Configuratio
11、n file for the Agilent E4438C .19Annex F (normative) High SNR demodulation of ISO/IEC 24730-2 DSSS BPSK signals 27Annex G (normative) High SNR demodulation of ISO/IEC 24730-2 OOK signals 28BS ISO/IEC 24769-2:2013ISO/IEC 24769-2:2013(E)ForewordISO (the International Organization for Standardization)
12、and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal
13、with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC
14、have established a joint technical committee, ISO/IEC JTC 1.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of the joint technical committee is to prepare International Standards. Draft International Standards adopted by the join
15、t technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.
16、ISO and IEC shall not be held responsible for identifying any or all such patent rights.ISO/IEC 24769-2 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 31, Automatic identification and data capture techniques.This first edition of ISO/IEC 24769-2, tog
17、ether with other parts of ISO/IEC 24769, cancels and replaces ISO/IEC TR 24769:2008, which has been technically revised.ISO/IEC 24769 consists of the following parts, under the general title Information technology Real-time locating systems (RTLS) device conformance test methods: Part 2: Test method
18、s for air interface communication at 2,4 GHz Part 5: Test methods for chirp spread spectrum (CSS) at 2,4 GHz air interfaceThe following parts are under preparation: Part 61: Low rate pulse repetition frequency Ultra Wide Band (UWB) air interface Part 62: High rate pulse repetition frequency Ultra Wi
19、de Band (UWB) air interfaceiv ISO/IEC 2013 All rights reservedBS ISO/IEC 24769-2:2013ISO/IEC 24769-2:2013(E)IntroductionISO/IEC 24730 defines the air interfaces and an application programming interface for Real Time Locating Systems (RTLS) devices used in asset management applications.This Internati
20、onal Standard contains all measurements required to be made on a product in order to establish whether it conforms to ISO/IEC 24730-2.Test methods for measuring performance of equipment compliant with ISO/IEC 24730-2 are given in ISO/IEC 24770. ISO/IEC 2013 All rights reserved vBS ISO/IEC 24769-2:20
21、13BS ISO/IEC 24769-2:2013Information technology Real-time locating systems (RTLS) device conformance test methods Part 2: Test methods for air interface communication at 2,4 GHz1 ScopeThis International Standard defines the test methods for determining the conformance of 2,4 GHz real-time locating s
22、ystem (RTLS) tags with the specifications given in the corresponding subclauses of ISO/IEC 24730-2, but does not apply to the testing of conformity with regulatory or similar requirements.The test methods require only that the mandatory functions, and any optional functions which are implemented, be
23、 verified. This may in appropriate circumstances be supplemented by further, application-specific functionality criteria that are not available to the general case.The RTLS tag conformance parameters included in this International Standard include the mandatory direct sequence spread spectrum (DSSS)
24、 2,4 GHz radio frequency beacon. It also includes the optional on-off keyed, frequency shift keyed (OOK/FSK) short-range radio frequency link and the optional magnetic air interface.Unless otherwise specified, the tests in this International Standard apply exclusively to RTLS tags defined in ISO/IEC
25、 24730-2.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including a
26、ny amendments) applies.ISO/IEC 19762-1, Information technology Automatic identification and data capture (AIDC) techniques Harmonized vocabulary Part 1: General terms relating to AIDCISO/IEC 19762-3, Information technology Automatic identification and data capture (AIDC) techniques Harmonized vocabu
27、lary Part 3: Radio frequency identification (RFID)ISO/IEC 24730-2, Information technology Real time locating systems (RTLS) Part 2: Direct Sequence Spread Spectrum (DSSS) 2,4 GHz air interface protocol3 Terms, definitions and abbreviated termsFor the purposes of this document, the terms and definiti
28、ons given in ISO/IEC 19762-1, ISO/IEC 19762-3 and the following apply.3.1 Terms and definitions3.1.1error vector magnitudeEVMdifference between the measured signal and a referenceNote 1 to entry: A reference is a perfectly modulated signal.INTERNATIONAL STANDARD ISO/IEC 24769-2:2013(E) ISO/IEC 2013
29、All rights reserved 1BS ISO/IEC 24769-2:2013ISO/IEC 24769-2:2013(E)3.2 Abbreviated termsARB arbitrary waveform generatorBPSK binary phase shift keyingDSSS direct sequence spread spectrumDUT device under testEIRP effective isotropic radiated powerEVM error vector magnitudeFSK frequency shift keyingOO
30、K on-off keyingPPM parts per millionRBW resolution bandwidthRTLS real-time locating systemTIB timed interval blinkVBW video bandwidth4 Conformance tests for ISO/IEC 24730-2The following subclauses describe the conformance tests.4.1 GeneralThis International Standard specifies a series of tests to de
31、termine the conformance of RTLS tags to the ISO/IEC 24730-2 air interfaces. The results of this test shall be compared with the values of the parameters specified in ISO/IEC 24730-2 to determine whether the tag under test conforms.This International Standard also specifies a series of tests to deter
32、mine the conformance of RTLS RF receivers to the ISO/IEC 24730-2 air interfaces. The results of these tests shall be compared with the values of the parameters specified in ISO/IEC 24730-2 to determine whether the RF receiver under test conforms.This International Standard additionally specifies tes
33、ts to determine the conformance of the magnetic exciter device that is specified as an optional air interface for ISO/IEC 24730-2.4.2 Default conditions applicable to the test methodsThese conditions apply to all tests.4.2.1 Test environmentUnless otherwise specified, testing shall take place in an
34、environment of temperature 23 C 3 C (73 F 5 F) and of relative humidity 25 % to 75 %.4.2.2 Default toleranceUnless otherwise specified, a default tolerance of + 5 % shall be applied to the quantity values given to specify the characteristics of the test equipment and the test method procedures.2 ISO
35、/IEC 2013 All rights reservedBS ISO/IEC 24769-2:2013ISO/IEC 24769-2:2013(E)4.2.3 Noise floor at test locationNoise floor at test location shall be measured with the spectrum analyser in the same conditions as the measurement of the DUT, with a span of 10 MHz: RBW, VBW and antenna.The spectrum analys
36、er shall be configured in acquisition mode for at least 1 minute.The maximum of the measured amplitude shall be at least 60 dB below the expected value of the amplitude of the measured tag DSSS transmission at 0 dBm power with the tag placed at 1 m from the measurement antenna.Special attention has
37、to be given to spurious emissions, e.g. insufficiently shielded computer monitors. The electromagnetic test conditions of the measurements shall be checked by performing the measurements with and without a tag in the field.4.2.4 Total measurement uncertaintyThe test equipment will introduce a level
38、of measurement uncertainty. For example, the frequency accuracy of the local oscillator used in RF down-converter will add uncertainty to the calculated frequency accuracy of the measured RF. The specifications of the test equipment used shall be included in the report.4.3 Tag DSSS RF transmission t
39、estsThis portion of the document describes the tests of the DSSS transmissions.4.3.1 GeneralThe DUT shall be an RTLS tag. The measurement equipment shall consist of an anechoic chamber as described in Annex A, and a measuring antenna and a vector signal analyser for example an Agilent E4443A1)with 8
40、0 MHz bandwidth, as described in Annex C. Figure 1 shows the required test equipment setup.DUT1 meterVector Signal analyzerMeasurement AntennaFigure 1 Setup of equipment for DSSS RF test4.3.2 Test ObjectiveThe objective of this test is to verify that the RTLS tag provides the appropriate DSSS modula
41、tion waveform required for proper system performance.1) The Agilent E4443A is an example of a suitable product available commercially. This information is given for the convenience of users of this document and does not constitute and endorsement by ISO or IEC of this product. ISO/IEC 2013 All right
42、s reserved 3BS ISO/IEC 24769-2:2013ISO/IEC 24769-2:2013(E)4.3.3 Test procedureThe tag shall be configured to transmit a 152-bit DSSS blink (as defined in 6.3.2.4 of ISO/IEC 24730-2) at an interval of 10 seconds or less. Each blink shall be configured with at least 2 sub-blinks. The tag shall be conf
43、igured to transmit at a class 1 power between 0 dBm and +10 dBm EIRP. The measurement equipment shall be configured to start capturing for not less than 2,5 milliseconds after the RF energy detected is above the threshold. The post processing software shall calculate the raw samples and produce metr
44、ics for the following parameters to verify compliance of the tag.4.3.4 Test measurements and requirementsThis subclause describes the test measurements and requirements.4.3.4.1 Carrier frequencyThe carrier frequency shall be 2 441,750 MHz 61 kHz (25 PPM). The carrier frequency drift over the duratio
45、n of the entire message shall be less than 5 kHz (2 PPM).4.3.4.2 Transmit powerThe transmitted power shall be calculated based on the power received at the measurement antenna. The calculated power shall be within 2,0 dB of the DUT specified transmit power.4.3.4.3 Chip rateThe chip rate of the BPSK
46、shall be 30,521 875 MHz 763 Hz (25 PPM). No phase transitions shall occur at less than the chip rate, and all phase transitions shall occur at an integral multiple of the chip rate. An example methodology for measuring these transitions is provided in Annex F.4.3.4.4 Message content and structureThe
47、 post processing software shall verify the 152-bit message format including preamble, status bits, tag ID, data, and message CRC are in compliance with the format specified in ISO/IEC 24730-2, 6.3.2.1. The post processing software shall verify differential data encoding within the message.4.3.4.5 PN
48、 code length and polynomialThe polynomial used for driving the BPSK DSSS modulation is defined in Figure 3 of 6.1 of ISO/IEC 24730-2. The entire captured message shall be 511 * 152 = 77 672 chips in length. The post processing software shall verify compliance with the defined PN sequence polynomial
49、and second order nonlinearity equation specified in ISO/IEC 24730-2.4.3.4.6 Error vector magnitudeA BPSK signal shall produce a phase/amplitude constellation of two points. The post processing software shall determine the error vector magnitude of the distribution of the captured signal. The EVM must be less than 10 %.4.3.4.7 Sub-blink interval and ditherConnect the measurement antenna to the vector signal analyser. Set up the analyser to trigger on the energy of the first sub-blink of a blink, and mea
