1、 Reference numberISO/TS 24155:2007(E)ISO 2007TECHNICAL SPECIFICATION ISO/TS24155First edition2007-05-01Hydrometry Hydrometric data transmission systems Specification of system requirements Hydromtrie Systmes de transmission des donnes hydromtriques Spcification des exigences des systmes Copyright In
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8、e from IHS-,-,-ISO/TS 24155:2007(E) ISO 2007 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Basic requirements. 1 4.1 General. 1 4.2 Objectives of use 1 4.3 Functional requirements 2 4.4 Geographical structures 2 4.
9、5 Time structures . 2 4.6 Installation conditions 3 4.7 Considerations for designing 3 5 Functional requirements of system 4 5.1 General. 4 5.2 Remote telemetry stations. 4 5.3 Telemetry system 5 5.4 Receiving center . 6 5.5 System supervision 8 5.6 Power supply. 8 6 Operational requirement 9 6.1 Ge
10、neral. 9 6.2 Operating and maintenance manual. 9 6.3 Maintenance 9 Annex A (informative) Configuration of hydrometric data transmission systems 10 Annex B (informative) Functional block diagram of hydrometric data transmission systems 12 Annex C (informative) Locations of remote telemetry stations.
11、14 Annex D (informative) Interfaces of hydrometric sensors at remote telemetry stations 16 Annex E (informative) Data collection sequence 17 Annex F (informative) Communication lines for data transmission . 23 Annex G (normative) Design of VHF/UHF radio link. 26 Annex H (informative) Network archite
12、cture . 28 Annex I (informative) Data repeating methods at a relay station 32 Annex J (informative) General power supply for remote telemetry stations . 33 Copyright International Organization for Standardization Provided by IHS under license with ISO Not for ResaleNo reproduction or networking perm
13、itted without license from IHS-,-,-ISO/TS 24155:2007(E) iv ISO 2007 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out t
14、hrough ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO colla
15、borates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Sta
16、ndards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. In other circumstances, particularly when there is an urgent mark
17、et requirement for such documents, a technical committee may decide to publish other types of normative document: an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in an ISO working group and is accepted for publication if it is approved by more than
18、 50 % of the members of the parent committee casting a vote; an ISO Technical Specification (ISO/TS) represents an agreement between the members of a technical committee and is accepted for publication if it is approved by 2/3 of the members of the committee casting a vote. An ISO/PAS or ISO/TS is r
19、eviewed after three years in order to decide whether it will be confirmed for a further three years, revised to become an International Standard, or withdrawn. If the ISO/PAS or ISO/TS is confirmed, it is reviewed again after a further three years, at which time it must either be transformed into an
20、 International Standard or be withdrawn. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO/TS 24155 was prepared by Technical Committee ISO/TC 113,
21、 Hydrometry, Subcommittee SC 5, Instruments, equipment and data management. Copyright International Organization for Standardization Provided by IHS under license with ISO Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO/TS 24155:2007(E) ISO 2007 All rights rese
22、rved vIntroduction Hydrometric data transmission systems provide data for the day-to-day management of water resources and for warning and forecasting of floods, droughts and conditions affecting water quality and public health. The systems transmit data measured at remote telemetry stations to a re
23、ceiving center for further processing. This Technical Specification defines and standardizes the required specifications of hydrometric data transmission systems. It does not describe the specifications of the equipment and units constituting hydrometric data transmission systems, but does describe
24、the functional performance that the hydrometric data transmission systems should provide. Copyright International Organization for Standardization Provided by IHS under license with ISO Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright International Organiz
25、ation for Standardization Provided by IHS under license with ISO Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-TECHNICAL SPECIFICATION ISO/TS 24155:2007(E) ISO 2007 All rights reserved 1Hydrometry Hydrometric data transmission systems Specification of system requ
26、irements 1 Scope This Technical Specification specifies the technical requirements that should be considered in designing and operating hydrometric data transmission systems and the necessary functions of those systems. 2 Normative references The following referenced documents are indispensable for
27、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 772:1996, Hydrometric determinations Vocabulary and symbols ISO 1000:1992, SI units and recommendation
28、s for the use of their multiples and of certain other units ISO/IEC 2382-1:1993, Information technology Vocabulary Part 1: Fundamental terms 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 772 and ISO/IEC 2382-1 apply. 4 Basic requirements 4.1 Genera
29、l This clause specifies the general requirements for designing a hydrometric data transmission system (HDTS). An HDTS shall be designed to meet the basic requirements, defined hereinafter, taking into consideration functionality, geographical structures, time structures, installation conditions, rel
30、iability, safety, maintainability and economy. The final system specifications should be determined through the process of repetitive discussions among technological specialists in hydrological and telecommunications fields. The conceptual configuration of an HDTS is shown in Annex A. 4.2 Objectives
31、 of use An HDTS shall be designed with a full understanding of the necessity and importance of hydrometric services for appropriate water management in river basins in which this system is to be used. Copyright International Organization for Standardization Provided by IHS under license with ISO Not
32、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO/TS 24155:2007(E) 2 ISO 2007 All rights reserved4.3 Functional requirements The functional requirements for an HDTS are classified into the following. a) Mandatory requirements: the minimum requirements that an HDTS d
33、esigner shall comply with in designing the system. The mandatory requirements include legal requirements, for example for the site where the system will be installed, and applicable specifications of various standards. b) Optional requirements: the functions and methods of implementing them that an
34、HDTS designer can select. The optional requirements include the requirements, such as the data collection sequence and selection of communications link as specified in Clause 5. An HDTS should be designed to fully achieve the mandatory functional requirements, and to meet the optional requirements i
35、n full consideration of the users requirements and operational purposes of the system so as to demonstrate the required system functionality. 4.4 Geographical structures The following geographical structures shall be determined as a fundamental element of HDTS: a) location(s) of the remote telemetry
36、 station(s); b) location(s) of the receiving center(s); and c) location(s) of the relay station(s), if necessary. A remote telemetry station is located at a selected hydrometric-observation point. Therefore, remote telemetry stations are distributed over a geographically wide area, including a river
37、 basin. Remote telemetry stations can not always be located at optimum hydrological sites, but may be relocated from the planned sites because of geographical problems and difficulties in data transmission. A receiving center consists of equipment and receives data from remote telemetry stations for
38、 data processing and display; it is located at a site where data and/or information is needed. Therefore, the receiving center will usually be located within the facility of a user organization. In large river basins, receiving centers may be distributed at user organizations near a hydrometric-obse
39、rvation point. According to the necessity of the communication medium, a relay station shall be provided in the system. These geographical structures should be considered not only at the time of designing but also for the future plans. 4.5 Time structures Usually, an HDTS is used on a real-time basi
40、s. An HDTS has two time domains: the first domain is the time used in the natural world; the other is the time series in system operation. The basic property of time in system operation is the time when the hydrometric observation is made at a gauging point; the gauging intervals and the delay times
41、 are required in data presentation. Usually, sensors at remote telemetry stations continuously measure hydrological phenomena, but the data monitored at the receiving center are sampled in a time series. Therefore, these time characteristics and their allowable error range should be determined for t
42、he purposes of operation. Details are shown in Annex E. Copyright International Organization for Standardization Provided by IHS under license with ISO Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO/TS 24155:2007(E) ISO 2007 All rights reserved 34.6 Installati
43、on conditions The environmental conditions of the remote telemetry stations may be more severe than those of telecommunication equipment installed indoors. Therefore, the following conditions should be considered: a) temperature range and rate of change; b) relative humidity range with no condensati
44、on; c) wind velocity; d) seismic resistance; e) damage due to sea wind, dust, and/or toxic gases; f) available power supply conditions (including impact of surge currents due to lightning); g) equipment damage and access during flooding. The environmental conditions of the telecommunications and inf
45、ormation equipment to be installed at a receiving center should also be considered for items a), b), d) and f) above. Details are shown in Annex C. 4.7 Considerations for designing 4.7.1 Reliability An HDTS is basically designed for continuous operation for its original purpose of use, particularly
46、in the case of heavy rains and floods. Designers shall consider the reliability of equipment and the entire system. For the important functions of the system, alternative means or a redundancy of the system should be provided. For example, duplicate communication lines can be installed to connect im
47、portant remote telemetry stations in a gauging area to a receiving center. A hot-standby system can also be used for the equipment having important functions. The hydrological data measured by important remote telemetry stations can be input to site recorder and the storage term(s) and period should
48、 meet the users requirements. 4.7.2 Safety An HDTS shall be designed as a safe (fail-safe) system that can always secure safe system operation in the case of a malfunction of equipment, faulty operation by a user, or a system failure due to any external factor. The fail-safe should prevent such prob
49、lems from spreading over the entire system. If the malfunction or failure in part of the system or faulty operation by a user is non-critical, the principal functions of the system should continuously operate because of the importance of hydrometric observation. 4.7.3 Data permanence The permanence o
