1、 Reference numberISO/IEC TR 24769:2008(E)ISO/IEC 2008TECHNICAL REPORT ISO/IECTR24769First edition2008-12-15Information technology Real-time locating system (RTLS) device conformance test methods Test methods for air interface communication at 2,4 GHz Technologies de linformation Mthodes dessai de co
2、nformit du dispositif des systmes de localisation en temps rel (RTLS) Mthodes dessai pour la communication dinterface dair 2,4 GHz ISO/IEC TR 24769:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but
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7、2 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO/IEC 2008 All rights reservedISO/IEC TR 24769:2008(E) ISO/IEC 2008 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms, definitions and abbreviated terms . 1
8、3.1 Terms and definitions. 1 3.2 Abbreviated terms 2 4 Conformance tests for ISO/IEC 24730-2. 2 4.1 General. 2 4.2 Default conditions applicable to the test methods . 2 4.2.1 Test environment 2 4.2.2 Default tolerance. 3 4.2.3 Noise floor at test location. 3 4.2.4 Total measurement uncertainty 3 4.3
9、 Tag DSSS RF transmission tests 3 4.3.1 General. 3 4.3.2 Test Objective . 4 4.3.3 Test procedure 4 4.3.4 Test measurements and requirements. 4 4.3.5 Test report . 5 4.4 Receiver DSSS RF tests. 5 4.4.1 General. 5 4.4.2 Test objective 5 4.4.3 Test procedure 5 4.4.4 Test measurements and requirements.
10、6 4.4.5 Test report . 7 4.5 Tests for optional air interfaces 7 4.5.1 Tag optional OOK/FSK RF tests 7 4.5.2 Tag optional magnetic receiver test . 9 4.5.3 Optional exciter magnetic transmitter test 11 4.5.4 Tag system response timing . 13 Annex A (informative) RF Test measurement site 15 Annex B (nor
11、mative) Message formats for tests 16 Annex C (normative) Technical requirements of measurement antenna and vector signal analyzer 18 Annex D (normative) Technical requirements of the arbitrary waveform generator and magnetic coil 19 Annex E (informative) Configuration file for the Agilent E4438C 20
12、Annex F (normative) High SNR demodulation of ISO/IEC 24730-2 DSSS BPSK signals 31 Annex G (normative) High SNR demodulation of ISO/IEC 24730-2 OOK signals 32 ISO/IEC TR 24769:2008(E) iv ISO/IEC 2008 All rights reservedForeword ISO (the International Organization for Standardization) and IEC (the Int
13、ernational 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 with particular
14、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 have established
15、 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 joint technical co
16、mmittee 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. In exceptional circumstances, the joint technical committee may propose the publication of a Technical Report of one of the followi
17、ng types: type 1, when the required support cannot be obtained for the publication of an International Standard, despite repeated efforts; type 2, when the subject is still under technical development or where for any other reason there is the future but not immediate possibility of an agreement on
18、an International Standard; type 3, when the joint technical committee has collected data of a different kind from that which is normally published as an International Standard (“state of the art”, for example). Technical Reports of types 1 and 2 are subject to review within three years of publicatio
19、n, to decide whether they can be transformed into International Standards. Technical Reports of type 3 do not necessarily have to be reviewed until the data they provide are considered to be no longer valid or useful. Attention is drawn to the possibility that some of the elements of this document m
20、ay be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. ISO/IEC TR 24769, which is a Technical Report of type 3, was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 31, Automatic identif
21、ication and data capture techniques. ISO/IEC TR 24769:2008(E) ISO/IEC 2008 All rights reserved vIntroduction ISO/IEC 24730 defines the air interfaces and an application programming interface for Real Time Locating Systems (RTLS) devices used in asset management applications. This Technical Report co
22、ntains 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 TR 24770. TECHNICAL REPORT ISO/IEC TR 24769:2008(E) ISO/IEC 2008 All rights r
23、eserved 1Information technology Real-time locating system (RTLS) device conformance test methods Test methods for air interface communication at 2,4 GHz 1 Scope This Technical Report defines the test methods for determining the conformance of 2,4 GHz real-time locating system (RTLS) tags with the sp
24、ecifications given in the corresponding parts 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 verified. This may in appropriat
25、e 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 document include the mandatory direct sequence spread spectrum (DSSS) 2,4 GHz radio frequency beacon. It also incl
26、udes 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 Technical Report apply exclusively to RTLS tags defined in ISO/IEC 24730-2. 2 Normative references The following refe
27、renced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO/IEC 19762-1, Information technology Automatic identification an
28、d data capture (AIDC) techniques Harmonized vocabulary Part 1: General terms relating to AIDC ISO/IEC 19762-3, Information technology Automatic identification and data capture (AIDC) techniques Harmonized vocabulary Part 3: Radio frequency identification (RFID) ISO/IEC 24730-2, Information technolog
29、y Real-time locating systems (RTLS) Part 2: 2,4 GHz air interface protocol 3 Terms, definitions and abbreviated terms For the purposes of this document, the terms and definitions given in ISO/IEC 19762-1, ISO/IEC 19762-3 and the following apply. 3.1 Terms and definitions 3.1.1 error vector magnitude
30、 EVM difference between the measured signal and a reference NOTE A reference is a perfectly modulated signal. ISO/IEC TR 24769:2008(E) 2 ISO/IEC 2008 All rights reserved3.2 Abbreviated terms ARB arbitrary waveform generator BPSK binary phase shift keying DSSS direct sequence spread spectrum DUT devi
31、ce under test EIRP effective isotropic radiated power EVM error vector magnitude FSK frequency shift keying OOK on-off keying PPM parts per million RBW resolution bandwidth RTLS real-time locating system TIB timed interval blink VBW video bandwidth 4 Conformance tests for ISO/IEC 24730-2 The followi
32、ng subsections describe the conformance tests. 4.1 General This Technical Report specifies a series of tests to determine 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 d
33、etermine whether the tag under test conforms. This Technical Report also specifies a series of tests to determine 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
34、 determine whether the RF receiver under test conforms. This Technical Report additionally specifies tests 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 methods These condi
35、tions apply to all tests. 4.2.1 Test environment Unless otherwise specified, testing shall take place in an environment of temperature 23 C 3 C (73 F 5 F) and of relative humidity 25 % to 75 %. ISO/IEC TR 24769:2008(E) ISO/IEC 2008 All rights reserved 34.2.2 Default tolerance Unless otherwise specif
36、ied, 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. 4.2.3 Noise floor at test location Noise floor at test location shall be measured with the spectrum analyzer in the same conditions as
37、the measurement of the DUT, with a span of 10 MHz: RBW, VBW and antenna. The spectrum analyzer 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
38、at 0 dBm power with the tag placed at 1 meter from the measurement antenna. Special attention has 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 witho
39、ut a tag in the field. 4.2.4 Total measurement uncertainty The test equipment will introduce a level 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 spe
40、cifications of the test equipment used shall be included in the report. 4.3 Tag DSSS RF transmission tests This portion of the document describes the tests of the DSSS transmissions. 4.3.1 General The DUT shall be an RTLS tag. The measurement equipment shall consist of an anechoic chamber as describ
41、ed in Annex A, and a measuring antenna and a vector signal analyzer for example an Agilent E4443A1)with 80 MHz bandwidth, as described in Annex C. Figure 1 shows the required test equipment setup. Figure 1 Setup of equipment for DSSS RF test 1) The Agilent E4443A is an example of a suitable product
42、available commercially. This information is given for the convenience of users of this Technical Report and does not constitute and endorsement by ISO of this product. ISO/IEC TR 24769:2008(E) 4 ISO/IEC 2008 All rights reserved4.3.2 Test Objective The objective of this test is to verify that the RTL
43、S tag provides the appropriate DSSS modulation waveform required for proper system performance. 4.3.3 Test procedure The tag shall be configured to transmit a 152-bit DSSS blink (as defined in paragraph 6.3.2.4 of ISO/IEC 24730-2) at an interval of 10 seconds or less. Each blink shall be configured
44、with at least 2 sub-blinks. The tag shall be configured 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
45、 shall calculate the raw samples and produce metrics for the following parameters to verify compliance of the tag. 4.3.4 Test measurements and requirements This section describes the test measurements and requirements. 4.3.4.1 Carrier frequency The carrier frequency shall be 2 441.750 MHz 61 kHz (25
46、 PPM). The carrier frequency drift over the duration of the entire message shall be less than 5 kHz (2 PPM). 4.3.4.2 Transmit power The 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 trans
47、mit power. 4.3.4.3 Chip rate The chip rate of the BPSK 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 provi
48、ded in Annex F. 4.3.4.4 Message content and structure The 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, sector 6.3.2.1. The post processing software shall
49、 verify differential data encoding within the message. 4.3.4.5 PN code length and polynomial The polynomial used for driving the BPSK DSSS modulation is defined in Figure 3 of section 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 and second order non-linearity equation specified in ISO/IEC 24730-2. 4.3.4.6 Error vector magnitude A BPSK signal shall pr
