Standard Briefing:Stadard ID: GY/T 197-2003
Stadard Title: Uniform technical specification for digital satellite news gathering
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Uniform technical specification for digital satellite news gathering
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GY/T 197-2003
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Basic Data: | Standard_ID | GY/T 197-2003 (GY/T197-2003; GYT 197-2003; GYT197-2003) | | Description (Translated English) | Uniform technical specification for digital satellite news gathering | | Sector / Industry | Radio, Film & TV Industry Standard (Recommended) | | Classification of Chinese Standard | M35 | | Classification of International Standard | 33.060.30 | | Word Count Estimation | 11,000 | | Date of Issue | 2003-10-29 | | Date of Implementation | 2003-12-01 | | Summary | This standard specifies the digital satellite news gathering general technical requirements. This standard applies to digital satellite news gathering earth station (vehicle or transportable station) equipment production, inspection, access, use, and operation and maintenance. | Contents, Scope, and Excerpt:GY/T 197-2003
Uniform technical specification for digital satellite news gathering
Central Republic Radio, Film and Television
General technical specifications for digital satellite news gathering
2 Shi
GY 003-10-29 released
2003-12-01 Shihua People's State Administration of Radio, Film and Television issued industry standards
Contents
Foreword ... II
Introduction ... III
1 Scope ... 1
2 Normative references ... 1
3 Terms, definitions and abbreviations ... 1
4 DSNG system transmission process and basic components ... 2
5 Safety requirements ... 3
6 Electromagnetic environment requirements ... 3
7 Technical requirements ... 3
8 Working environment requirements ... 6
Foreword
This standard mainly refers to Recommendation ITU-R SNG.1007-1 and other satellite news gathering of the Radiocommunication Sector of the International Telecommunication Union
Series of Recommendations, and European Telecommunications Standards Organization's series of standards and reports on digital satellite news gathering, combined with China's satellite news gathering
The technical requirements for network access are based on the practical application of digital broadcasting and satellite news gathering in China's radio and television.
This standard is under the jurisdiction of the National Radio and Television Standardization Technical Committee.
This standard was drafted. Standardization Planning Institute of the State Administration of Radio, Film and Television, and CCTV.
The main drafters of this standard. Zhu Yunyi, Jia Peihong, Wang Yanping, Cai Xiaomei.
introduction
Digital Satellite News Gathering (DSNG) uplink earth station has small equipment size, easy installation, quick start-up, and no geographical restrictions
And flexible and mobile characteristics, so it plays an important role in the interview of important news events, and the application in the radio and television industry
More and more extensive.
DSNG operates in the fixed-satellite service band and is used temporarily. It is important to consider the following principles when using it.
-Ensure compliance with international radio regulations and relevant domestic regulations;
-Ensure that the technical requirements for satellite access are met;
-According to transmission requirements, technical means for scrambling and encryption can be provided;
-Minimize internal links, install quickly and easily, all external connections should be waterproof. With proper device configuration, allow
Some equipment of DSNG works after the shelter is removed, but it provides a non-open-air environment for the electrical equipment to control the system equipment.
General technical specifications for digital satellite news gathering
1 Scope
This standard specifies the general technical requirements for digital satellite news gathering.
This standard applies to the production, acceptance, network access, use and operation of digital satellite news gathering earth stations (vehicle or removable stations) equipment
maintain.
2 Normative references
The clauses in the following documents have become the clauses of this standard after being referenced. For dated references, all subsequent
Neither amendments (excluding errata) or revised versions are applicable to this standard, however, parties who have reached an agreement under this standard are encouraged to study
Is the latest version of these files available? For undated references, the latest version applies to this standard.
GB 9159-1988 safety requirements for radio transmitting equipment
GB 12638-1990 Microwave and Ultrashort Wave Communication Equipment Radiation Safety Requirements
GB 13615-1992 Earth station electromagnetic environment protection requirements
GB/T 17700-1999 Satellite digital television broadcasting channel coding and modulation standard
GB/T 17975.1-2000 Information technology. Universal coding of moving pictures and associated audio information. Part 1. System
GB/T 17975.2-2000 Information technology. Generic coding of moving pictures and associated audio signals. Part 2. Video
GB/T 17975.3-2002 Information technology. Generic coding of moving images and associated sound signals. Part 3. Audio
ITU-R BO.1211 Digital multi-program transmission system for satellite television, sound and data services in 11/12GHz
ITU-R S.524-7 Maximum allowable off-axis EIRP density of GSO fixed earth transmitting earth stations in 6GHz, 14GHz and 30GHz
Level
Antenna radiation pattern for ITU-R S.580 geostationary satellite earth station design
ITU-R S.726 Maximum allowable level of spurious radiation for ultra-small aperture terminals
ITU-R SNG.722-1 (Analog) General Technical Standard for Satellite News Gathering
ITU-R SNG.770-1 General operation procedure for satellite news gathering
ITU-R SNG.1007-1 (Digital) General Technical Standards for Satellite News Gathering
Digital transmission technology used in ITU-R SNG.1152 (sound) satellite news gathering
ITU-R SNG.1421 Common operating parameters for digital satellite news gathering transmission interoperation
ETSI EN 301 210 Frame structure, channel coding and modulation for digital satellite news gathering and other satellite distribution applications
ETSI TR 101 221 User Guide for Digital Satellite News Gathering and Other Satellite Distribution Applications
ETSI ETS 300 327 Satellite News Gathering Removable Earth Station
IESS 308 uses convolutional coding/Viterbi coding and QPSK modulation, working characteristics of digital carrier with medium data rate
3 Terms, definitions and abbreviations
3.1 Terms and definitions
The following terms and definitions apply to this standard.
Digital satellite news gathering (DSNG)
Working in the fixed-satellite service band, using digital technology, using vehicle-mounted or portable satellite uplink earth stations to view video and audio signals
Temporary transmission.
3.2 Acronyms
The following abbreviations apply to this standard.
8PSK Eight Phase Shift Keying
BER Bit Error Ratio
DSNG Digital Satellite News Gathering
EIRP Equivalent Isotropically Radiated Power
GSO Geostationary-Satellite Orbit
IF Intermediate Frequency
IRD Integrate Receiver Decoder
QEF Quasi-Error-Free
QPSK Quaternary Phase Shift Keying
RF Radio Frequency
RS Reed-Solomon
UPS Uninterrupted Power Supply
4 DSNG system transmission process and basic components
The signal processing and transmission process of DSNG system is shown in Figure 1.
Audio
Encoder
video
Power amplifier
Upconverter
modem
Satellite transponder
Satellite receiving antenna
IRD
Satellite transmitting antenna
Audio video
TV station
satellite
Collection site
DSNG system
Figure 1 Signal processing and transmission process of DSNG system
The basic components of a DSNG system include.
· Antenna feeder system;
· RF subsystem;
· Compression coding and modulation subsystem;
· Ancillary function subsystems.
Among them, the auxiliary function subsystem includes.
· Monitoring unit;
· IRD unit;
· Power supply unit;
· Positioning and pointing device.
5 Safety requirements
5.1 The microwave and ultra-short wave radiation intensity of the uplink station equipment should not exceed the safety limit specified in GB 12638-1990.
5.2 The safety requirements of the transmitting equipment of the uplink station shall meet the relevant regulations of GB 9159-1988.
6 Electromagnetic environment requirements
The electromagnetic environment requirements shall meet the relevant regulations of GB 13615-1992.
7 Technical requirements
7.1 Technical requirements for source coding
7.1.1 Video encoding
Adopt MPEG-2 4. 2. 0MP @ ML main type main stage and MPEG-2 4. 2. 2P @ ML video encoding, which should comply with the relevant requirements of GB/T 17975.2-2000
Regulations.
7.1.2 Audio encoding
May use MPEG-2 level Ⅰ or level Ⅱ audio coding, should comply with the relevant provisions of GB/T 17975.3-2002.
7.2 Transmission system technical requirements
The functional block diagram of the transmission system is shown in Figure 2.
(204,
188) 8PSK
1 positive
Baseband
= 0.35
Bit
Map
cascade
QPSK
Intercourse
Weaving
(I = 12)
Reuse
adaptation
energy
diffusion
Outside editor
Encoder
RS
Audio
Encoder
data
Encoder
video
Encoder
MPEG-2 source coding and multiplexing satellite channel adaptation
a At 8PSK, α = 0.25 can also be used.
Figure 2 Functional block diagram of the transmission system
7.2.1 Channel coding
DSNG channel coding should comply with the relevant provisions of GB/T 17700-1999.
7.2.2 Channel modulation
With QPSK and 8PSK modulation, the frequency spectrum of the signal at the output of the modulator should comply with the relevant provisions of GB/T 17700-1999.
For QPSK modulation, the roll-off coefficient α is equal to 0.35.
For 8PSK modulation, in addition to the roll-off coefficient α equal to 0.35, 0.25 can also be used.
7.2.3 Error characteristics
IF loop modems should meet the bit error rate and Eb/N0 characteristics requirements as shown in Table 1.
Table 1 IF loop characteristics of the system
Inner code encoding rate
Spectral efficiency
bit/symbol
Eb/N0
dB
1/2 0.92 4.5
2/3 1.23 5.0
3/4 1.38 5.5
5/6 1.53 6.0
QPSK
7/8 1.61 6.4
2/3 1.84 6.9
5/6 2.30 8.9 8PSK
8/9
2.46 9.4
a This column refers to the necessary Eb/N0 of the BER before the RS code = 2 × 10–4, and the QEF after the RS code.
b In frequency division multiplexing applications, the 8PSK encoding rate of 8/9 is suitable for the near-saturated state of satellite transponders.
7.3 Antenna characteristic requirements
7.3.1 Antenna Side Lobe Characteristics
Any off-axis direction within 3 ° on the GSO (see Figure 3), the peak value of the antenna side lobe 1o to 20o away from the main beam of the antenna cannot exceed 90% of formula (1)
The specified envelope.
G = 29-25Log (ϕ) (1 ° ≤ϕ ≤ 20 °) ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ (1)
In the formula.
G-antenna gain (dBi);
ϕ-off-axis angle (o).
The gain of the first side lobe should be less than 14dB below the main lobe.
7.3.2 Antenna Polarization Identification
In linear polarization, the cross-polarization isolation is not less than 30dB within -1dB of the main axis, and the other is not less than 25dB. For circular polarization, in the axial direction
In the -1dB range, its axial ratio is not greater than 1.06.
7.4 Emission characteristic requirements
7.4.1 Power stability
EIRP stability should be maintained at ± 1dB/d (except for severe weather).
7.4.2 Frequency tolerance of the transmitting carrier
Transmit carrier frequency tolerance, including initial deviation of carrier frequency and long-term drift values.
The frequency tolerance of the digital carrier is ± 0.025R, but the maximum should not exceed ± 3.5kHz.
R is the transmission rate into the modulator.
7.4.3 Transmission frequency
Observe the relevant regulations of the national radio regulatory agency.
7.4.4 Off-axis EIRP Density
In any direction within 3 ° on the GSO (see Figure 3), the off-axis EIRP density of the uplink earth station antenna in the 6GHz band must not exceed the specifications in Table 2.
Value.
Table 2 Off-axis EIRP density of uplink earth station antennas in the 6GHz band
Off-axis angle of maximum EIRP value per 4kHz (ϕ)
(32–25logϕ) dB (W/4kHz) 02.5 ° ≤ϕ ≤87 °
11dB (W/4kHz) 07 ° ＜ ϕ≤9.2 °
(35–25logϕ) dB (W/4kHz) 09.2 ° < ϕ≤48 °
--7dB (W/4kHz) 48 ° < ϕ≤180 °
In any direction within 3 ° on the GSO (see Figure 3), the off-axis EIRP density of the uplink earth station antenna in the 14GHz band must not exceed that in Table 3.
Specified value.
Table 3 Off-axis EIRP densities of uplink earth station antennas in the 14 GHz band
Maximum off-axis angle of EIRP value per 40kHz (ϕ)
(39–25logϕ) dB (W/40kHz) 02.5 ° ≤ϕ ≤87 °
18dB (W/40kHz) 07 ° ＜ ϕ≤9.2 °
(42--25logϕ) dB (W/40
0dB (W/40kHz)
Any direction outside the 3 ° range on the GSO, off-axis
Note. The range indicated by the shaded area is the antenna gain in equation (1).
Figure 3 Ascending Earth
7.4.5 Out-of-band emission EIRP value
Transmitted spurious, noise, or other unwanted signals (
Carrier assignment outside the satellite repeater band unit, but kHz) 09.2 ° < 9.2≤48 °
48 ° ＜ ϕ≤180 °
The EIRP value must not exceed 3dB of the limits in Tables 2 and 3.
Benefits applicable scope of work.
Station Antenna Design Objectives Limit GSO
Does not include non-linear multi-carrier intermodulation products and spectrum diffusion signals)
The EIRP value in the operating frequency band should not exceed -1dBW/4kHz.
8 Working environment requirements
The working environment requirements of DSNG are as follows.
· Working temperature. -35ºC ～ 55ºC;
Relative humidity. 5% to 100% (non-condensing);
· Wind speed ≤16m/s;
· Altitude ≤3600m;
· Solar radiation ≤1000W/m2;
· Power supply requirements. 220V ± 10%/50Hz ± 1Hz single-phase AC power supply or self-generation. If necessary, UPS power should be used.
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