Valid

GY/T 197-2003Uniform technical specification for digital satellite news gathering (English PDF)

Preview PDF

This is a limited preview

Buy now to download the full PDF (7 pages)

Need quotation for your management?

Get a formal quotation for GY/T 197-2003 in 30 minutes.

Issued by

State Administration of Radio and Television

Level / Type

National · Recommended

Issue date

October 29, 2003

Implementation date

December 1, 2003

Scope

GY/T 197-2003 (Uniform technical specification for digital satellite news gathering) is available as an English-translated PDF.

GY/T 197-2003 — 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.

Found what you need?

Document preview — GY/T 197-2003

National Standard of the People's Republic of China

ICS: 33.060.30
Classification: M 35

Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
4 DSNG system transmission process and basic components
5 Safety requirements
6 Electromagnetic environment requirements
7 Technical requirements
8 Working environment requirements

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.

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

Audio

Encoder

data

Encoder

video

Encoder

MPEG-2 source coding and multiplexing satellite channel adaptation a At 8PSK, alpha = 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 alpha is equal to 0.35.

For 8PSK modulation, in addition to the roll-off coefficient alpha 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 (phi) (1 ° <=phi <= 20 °) ................................. (1) in the formula.

G-antenna gain (dBi);

phi-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 (phi) (32–25logphi) dB (W/4kHz) 02.5 ° <=phi <=87 ° 11dB (W/4kHz) 07 ° < phi<=9.2 ° (35–25logphi) dB (W/4kHz) 09.2 ° 8 Working environment requirements the working environment requirements of DSNG are as follows.

· Working temperature. -35°C ~ 55°C;

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.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 7 pages — is available in the English PDF.

Referenced standards

Normative references

GB 12638-1990 · GB/T 17975.1-2000 · GB/T 17975.2-2000

How to Download GY/T 197-2003

1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.