GB 13616-2009Electromagnetic environment protection requirements for digital radio-relay stations (English PDF)

Foreword

All the technical contents of this standard is mandatory.

This standard replaces GB 13616-1992 "microwave relay station electromagnetic environment protection requirements." this standard compared with GB 13616-1992 main changes are as follows.

--- Changing the name of the standard;

--- Updated the standard normative references;

--- Update the technical requirements to allow interference values;

--- The original Appendix A has been modified. changes A. 1, A. 3. Delete A. 2, modified as a new Appendix B;

--- Appendix B of the original has been modified. rewritten B. 1, and as a new Appendix A; the original B. 1.3.4 modified the original B. 3 merge as a new Appendix C; delete the original B. 2;

--- Appendix C of the original has been modified, and the modification is to move the body;

--- Adds a new appendix. Appendix D.

The standard reference method and the corresponding calculation error related to the performance of assigned ITU Recommendation given in digital microwave radio relay system and other technical parameters, combined with the technical features of our current relevant industry technical specifications and digital microwave radio relay station.

Appendix A of this standard is a normative appendix, Appendix B, Appendix C, Appendix D and Appendix E is an informative annex.

This standard by the National Standardization Technical Committee on Radio Interference (SAC/TC79) and focal points.

This standard was drafted. SRMC.

1 Scope

This standard specifies the digital microwave radio relay station electromagnetic interference environment to allow the value of the antenna in front of the clear zone requirements, and digital microwave relay station power Magnetic environmental testing methods.

This standard applies to working frequency of 1GHz ~ 40GHz horizon digital microwave radio relay transmission system station.

This standard does not apply to tropospheric scatter microwave stations.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.

GB 4824-2004 industrial, scientific and medical (ISM) radio-frequency equipment - Electromagnetic disturbance characteristics - Limits and methods of measurement (CISPR11.

2003, IDT)

YD/T 5088-2005 SDH microwave relay systems engineering

3 Terms and Definitions

The following terms and definitions apply to this standard.

Since one or more emission, radiation, induction or a combination thereof unwanted energy reception in a radio communication system to produce a shadow Sound, its performance as performance degradation, loss of information or misunderstanding, said the consequences if the existence of such unwanted energy, the result can be avoided.

4 Sources of interference

Digital microwave radio relay station may be subject to radio interference are.

a) satellite communication systems transmit interference (including earth station and satellite launch);

b) with microwave, radar, radio, television and other radio transmission frequency, harmonics and spurious emission interference;

c) industrial, scientific and medical radio-frequency radiation interference device.

5 Allows interference value

5.1 digital microwave relay systems with other business systems to share frequency interference when the permissible value SDH microwave radio relay systems for each transmission channel group cluster group or groups over constant bit rate shared with other business systems with A band, the inter-provincial trunk, trunk province, local access and microwave transmission Microwave transmission in any of these four basic channels for each direction of transmission Ho month deterioration amount permissible interference from other services should not exceed 10% of the corresponding channel error performance indicators, from the fixed sector the amount of traffic caused by the deterioration of partial interference should not exceed 89%, the amount of deterioration in other major businesses from common frequency caused should not exceed 10% the amount of all other sources of interference from the deterioration caused by not more than 1%.

Note. The error performance indicators inter-provincial trunk, trunk province, local access and microwave transmission Microwave transmission channel based on the four basic YD/T 5088-2005.

7 Front of the antenna Clearance Requirements

In front of digital microwave radio relay station antenna requires a certain open area (ie clear zone). Clearance requirements shown in Figure 1. In this range There should be no forest, high trees, buildings, metal structures and other inner circle.

D --- antenna opening surface diameter in m (D<=4m);

lambda --- operating wavelength, the unit is m;

F1 --- first Fresnel zone radius.

1 antenna front clearance zone FIG F1 by the formula (1) to determine.

Where.

Note. digital microwave radio relay station other location requirements refer to Appendix E.

Appendix A

(Normative)

Digital microwave radio relay station electromagnetic environment testing methods A. 1 testing purposes Digital microwave radio relay station electromagnetic environment testing is to digital microwave radio relay station before the construction site, get to be selected at the radio station site no. intensity, orientation and polarization, etc., as the decision to work at the sites to be selected in the existence of the digital microwave radio relay station the impact of the radio signal reference.

A. 2 Test System

Composition test system (see Figure A.1).

a) adapted to digital microwave band metered spectrum analyzer;

b) digital microwave band directional antenna is suitable for testing;

c) adapted to digital microwave frequency band RF connection cable (feeder);

d) Option for testing digital microwave band (including low-noise amplifiers, attenuators, filters, etc.);

e) for a stable power supply test systems.

Figure A. 1 Test System

A. Basic requirements 3 Testing

a) shall be for the location of the digital microwave radio relay station antenna test antenna on principle; the test sensitivity of the device to meet the index requirement and leave a Fixed margin to compensate for losses due to diffraction caused by the lack of height, the test may also be in the vicinity of the tall and relatively open sites the top of the buildings;

b) All test equipment shall be calibrated and used within the approved and valid under normal operating conditions;

c) between the test antenna and good application properties testing equipment cables;

d) test options shall be adjusted according to need;

e) spectrum analyzer sensitivity indicators should meet or exceed Table A. 1 requirements.

Table A. 1 spectrum analyzer sensitivity index requirements

Frequency Range/GHz sensitivity/dBm 0.001 to 2.5 Appendix B (Informative) the main interference level calculation formula B. 1 digital microwave radio relay station antenna aperture maximum allowable interference level calculation formula Converted to digital microwave radio relay station antenna aperture maximum permissible interfering signal level is calculated as formula (B.1) as follows.

PR = Pin + Chou -G (phi) (B.1) where.

PR --- digital microwave radio relay station antenna aperture maximum allowable interference signal level in units of dBW;

Pin --- digital microwave radio relay station at the receiver input maximum allowable interference signal level in units of dBW;

G (phi) --- digital microwave radio relay station receiving antenna directivity gain in the direction of interference, the unit is dBi;

Feeder system Chou --- digital microwave radio relay stations loss in dB.

B. 2 antenna gain calculated when calculating digital microwave radio relay station receiving antenna gain in the interfering signal direction, should adopt measured antenna pattern, and other related resources material. Without this information, then the parabolic antenna, you can use the formula (B.2) ~ (B.14) is calculated.

B. Ratio of 2.1 digital microwave radio relay station receiving antenna diameter and the operating wavelength of less than 100 when formula G (phi) = Gmax-2.5 × 10-

· () Phi 0 ° <=phi Appendix C (Informative) Space antenna aperture at the interference in terms of signal power flux density C. 1 power flux density signal level conversion Some tests need to use spatial signal power flux density at the antenna aperture, between it and the signal level can be converted by the formula (C.1).

Pr = 10lg (P'R/Se) (C.1) where.

Pr --- aperture antenna at space interference signal power flux density in dB (W/m2);

P'R --- antenna aperture of the interference signal power, in W;

Se = lambda

4pi

, Where lambda is the wavelength.

C. 2 in terms of the power flux density and field strength the space between the power flux-density signal with field strength by the formula (C.2) conversion.

P = 20lgE-10lgZ (C.2) where.

P --- spatial signal power flux density in dB (W/m2);

E --- spatial signal electric field strength, in units of V/m;

Z --- impedance of free space, is 377ohm.

C. Conversions 3 spectrum analyzer readings and electric field intensity Then use the spectrum analyzer to measure the field strength, the field strength readings relationship formula (C.3) as follows.

E '= P + A + F (C.3) where.

E '--- electric field strength, in units of dB (µV/m);

P --- spectrum analyzer readings in dBm;

A --- antenna factor, dB (1/m);

F --- conversion coefficient, dB. When the spectrum analyzer input impedance of 50ohm, F = 107dB.

Appendix D

(Informative)

Relationship between BER and SNR D. Relationship 1 MPSK modulation system BER and SNR when M = 2, the Pe~2Q 2EbN Sang () 0 (coherent demodulation DPSK) (D.1) Pe~0.5exp (-Eb/N0) (non-coherent demodulation of DPSK) (D.2) Pe~Q 2EbN Sang () 0 (BPSK) (D.3) when M > 2, Pe~2Q [2 (C/N) Sang 0sin (pi/M)] (D.4) log2 (MEb/N0) = (C/N) 0 (D.5) where.

Expression Q function is. Q (z) = integral

2 Sang pi

x0 e-

2/2d x0 (D.6)

M --- phasing number of phases;

Eb/N0 --- energy ratio signal bit to noise power spectral density;

(C/N) 0 --- corresponds to the theoretical value of the SNR in a bit error rate (such as 10-3 or 10-6), in units of dB.

D. 2 relationship MQAM modulation system BER and SNR Pe = 2PL 1-12P () L (D.7) PL ~2 (L-1) LQ Sang M- 1 (C/N) () 0 (D.8) where.

PL --- MQAM modulation system is one of the two quadrature components of the baseband signal error rate;

L = Sang M.

Theory can be drawn from the above formula (C/N) 0.

Appendix E

(Informative)

Digital microwave radio relay station siting requirements Digital microwave radio relay station site should meet the following requirements.

a) sites should be selected in easily accessible, reliable supply of places;

b) sites should avoid the often large vibration or noise of a strong place;

c) sites should be selected soil evenly, no collapse, landslide and dangerous rock in the lot;

d) sites should not be selected for distributing more dust and corrosive gases, corrosive emissions from nearby industrial enterprises in the production process;

e) sites should not be selected in the flammable and explosive material warehouses and airports as well as in the production process prone to fire, explosion Nearby industrial enterprises;

f) sites should not be selected in the mining areas and areas liable to floods the flooded areas.

references

[1] GB/T 3383 telecommunications transmission decibels.

[2] GB/T 6113.104 radio disturbance and immunity measuring apparatus and methods - Part 1-4. Radio disturbance and immunity measuring apparatus - Ancillary equipment - Radiated disturbances (GB/T 6113.104-2008, CISPR16-1-4.2005, IDT).

[3] GB/T 7615-1987 master antenna television system antenna portion.

[4] GB/T 13619 digital microwave relay systems interference calculation methods.

[5] GB 50016-2006 architectural design code for fire protection.

[6] ITU "RR" 2004 edition.