GB/T 34995-2017Technical requirements and measurement methods of receiving equipments for time service in single frequency network (English PDF)
单频网授时接收设备技术要求和测量方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
November 1, 2017
Implementation date
February 1, 2018
Scope
GB/T 34995-2017 is the English-translated version of 单频网授时接收设备技术要求和测量方法.
GB/T 34995-2017 is the Chinese standard "Technical requirements and measurement methods of receiving equipments for time service in single frequency network".
Its scope clause reads: This standard specifies the GB 20600-2006 terrestrial digital television broadcasting single-frequency network timing receiving equipment, technical requirements and measurement method.
Any equivalent measurement method that ensures the same measurement accuracy can also be used. In case of dispute, this standard shall prevail.
This standard applies to terrestrial digital television broadcasting single-frequency network timing receiving device (referred to as the receiving device) development, production, acceptance, so that Use, operation and maintenance. Its clauses include terms, definitions and abbreviations.
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Document preview — GB/T 34995-2017
National Standard of the People's Republic of China
- ICS
- 33.160
- Classification
- M 74
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms, definitions and abbreviations
- 3.1 Terms and definitions
- 3.2 Abbreviations
- 4 System Overview
- 5 technical requirements
- 5.1 General Requirements
- 5.2 Functional Requirements
- 5.3 Performance Indicators
- 6 Measurement equipment requirements and measurement methods
- 6.1 Measurement equipment requirements
- 6.2 Measurement Methods
1 Scope
This standard specifies the GB 20600-2006 terrestrial digital television broadcasting single-frequency network timing receiving equipment, technical requirements and measurement method. Any equivalent measurement method that ensures the same measurement accuracy can also be used. In case of dispute, this standard shall prevail.
This standard applies to terrestrial digital television broadcasting single-frequency network timing receiving device (referred to as the receiving device) development, production, acceptance, so that
Use, operation and maintenance.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
Digital television terrestrial broadcasting transmission system frame structure, channel coding and modulation
3 Terms, definitions and abbreviations
3.1 Terms and definitions
The following terms and definitions apply to this document.
3.1.1 Timing timeservice
Pass the standard time in a certain way.
3.1.2 Single Frequency Network singlefrequencynetwork; SFN
Digital television coverage network composed of a plurality of transmitters located in different places and in a synchronized state, each transmitter in the network is in phase
Same frequency, the same program is transmitted at the same time in order to achieve a reliable coverage of a specific service area.
3.1.3 Frequency tame
The process of locking the local oscillator frequency to standard frequency.
3.1.4 Frequencyaccuracy
The maximum range of frequency deviation, indicating the actual value of the frequency of its relative value of the nominal deviation.
3.1.5 Frequency stability
After the frequency source preheats for a certain period of time, its frequency reaches a certain actual value, and can maintain this value within a certain time interval
The ability to use Allen's standard deviation to characterize.
3.1.6 Timing Accuracy
Receiving device output timing 1pps signal deviation from the standard 1pps signal.
Note .1pps refers to the timing receiver device outputs one second pulse per second.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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