MH/T 4046-2017Civil Airport and Ground Aviation Radio Station (Station) Electromagnetic Environment Test Specification (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard was proposed and interpreted by the Air Traffic Control Industry Management Office of the Civil Aviation Administration of China.

This standard was approved by the Aircraft Airworthiness Certification Department of the Civil Aviation Administration of China.

This standard is under the jurisdiction of the China Academy of Civil Aviation Science and Technology.

Drafting organizations of this standard. Air Traffic Control Industry Management Office of Civil Aviation Administration of China, Civil Aviation Data Communication Co., Ltd., Beijing Airlines Day university.

1 Scope

This standard specifies the basic requirements for electromagnetic environment testing of civil airports and ground aviation radio stations (stations), test frequency bands, test locations and Test report requirements.

This standard applies to the testing and evaluation of the electromagnetic environment of civil airports and ground aviation radio stations (stations).

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document.

"ITU Spectrum Monitoring Manual"

3 Terms and definitions

The following terms and definitions apply to this document.

Maximum permitted interference field strength in order to ensure the normal operation of the radio station (station), it is converted to the maximum permissible interference signal field strength at the antenna port.

Maximum permitted interference power in order to ensure the normal operation of the radio station (station), the maximum allowable interference signal is converted to the antenna port (that is, received by the isotropic antenna).

No. power.

The sensitivity of the testing system when the output signal-to-noise ratio of the test system receiver is 3 dB, the minimum signal field strength or power that can be measured at the system receiving antenna port.

The location of the radio station the geographic location of the radio station (station) antenna expressed in WGS-84 coordinates.

4 Basic requirements

5 Test frequency band

5.1 For new (relocation) civil airports, at least the following radio frequency bands corresponding to ground aviation radio stations (stations) should be tested.

--Communication station. VHF station;

--Navigation station. heading beacon station, glide beacon station, omnidirectional beacon station, rangefinder station;

--Monitoring system. secondary radar or broadcast automatic related monitoring system.

In addition to the above-mentioned ground aeronautical radio stations (stations), if other ground aeronautical radio stations (stations) are planned to be built, their corresponding wireless Electric frequency band.

5.2 Reconstruction (expansion) of civil airports should at least test the ground aviation radio stations (stations) that are planned to be built or to be changed.

The corresponding radio frequency band.

5.3 Ground aeronautical radio stations (stations) newly built or changed radio stations (stations) should test their corresponding radio frequency bands.

5.4 Refer to Appendix B for the test frequency bands corresponding to ground aeronautical radio stations (stations).

6 Test location

7 Test report

7.1 There should be signatures of preparers, reviewers and approvers, and stamped with the seal of the testing unit or special test seal.

7.2 The necessary test system parameters should be listed.

7.3 The issuance time of the test report should be clarified, and the test report is valid for one year.

7.4 The analysis and conclusion of test results shall meet the following requirements.

--According to the test purpose, give clear test conclusions and suggestions;

--The test result chart should be marked with specifications and unity;

--The maximum allowable interference field strength (or power) test spectrogram should include "reference level", "intermediate frequency bandwidth (or resolution bandwidth)", "Frequency range" and other information; the displayed signal field strength or power unit is unified as "decibel microvolts per meter (dBµV/m)" or "min be milliwatt (dBm)";

--See Appendix A for the maximum permissible interference field strength or power requirements;

-Refer to Appendix C for the calculation and analysis basis of the test results.

7.5 For the format of the report, please refer to the template shown in Appendix D, or follow the report format certified by the testing unit for electromagnetic environment testing.

For each content contained in the template in Appendix D.

Appendix A

(Normative appendix) Maximum allowable interference field strength or power the maximum permissible interference field strength or power between civil airports and ground aviation radio stations (stations) is shown in Table A.1.

Appendix C

(Informative appendix) Related calculation formula 1) C.1 Load end power the load end power and voltage are converted according to formula (C.1).

C.2 Antenna factor (antenna factor) the antenna factor (antenna factor) is calculated according to the formula (C.2).

C.3 Signal field strength at the antenna port the signal field strength at the antenna port surface and the antenna load terminal voltage are converted according to formula (C.3).

C.4 Bandwidth factor when the IF bandwidth (or resolution bandwidth) BT of the test system is inconsistent with the reference bandwidth BS listed in Appendix A, it shall be calculated according to formula (C.4) Calculate the bandwidth factor and convert the test results to the reference bandwidth for analysis and comparison.

1) The calculation formulas given in this appendix are all results under 50 ohm load.

Where.

K--bandwidth factor, in decibels (dB);

BS--The reference bandwidth corresponding to the test frequency band, in kilohertz (kHz);

BT-Test system intermediate frequency bandwidth (or resolution bandwidth), in kilohertz (kHz).

C.5 Calculation of relevant parameters of test results C.5.1 Test system model this appendix uses the test system connection shown in Figure C.1 for modeling calculations. If the actual test system does not use related equipment, it is not considered in the calculation.

Figure C.1 Test system connection diagram

C.5.2 RF channel gain C.5.3 Calculation of the sensitivity of the test system System sensitivity is calculated based on the reference bandwidth listed in Appendix A.

If the IF bandwidth (or resolution bandwidth) is BT, the measurement receiver (or spectrum analyzer) is connected to a matching load (50 ohm) to measure If the noise floor power value is PNf, the sensitivity PRmin of the measuring receiver (or spectrum analyzer) under the reference bandwidth BS is calculated according to the formula (C.6) Calculate.

PRmin-measurement receiver (or spectrum analyzer) sensitivity, the unit is decibel milliwatt (dBm);

PNf - measure the noise floor power of the receiver (or spectrum analyzer) in decibel milliwatts (dBm);

K ---bandwidth factor, in decibels (dB).

Appendix D

(Informative appendix) Test report template and writing instructions Report No.

1.Only one option is required for antenna gain and antenna factor (antenna coefficient).

2.RF channel gain refers to the signal gain from the test antenna feed interface end to the test receiver input end. Refer to Appendix C for calculation Count.

3.System sensitivity refers to the sensitivity under the reference bandwidth listed in Appendix A. Refer to Appendix C for calculations.

12 Test results

1.Each page is the test result of a test point. If there are multiple test points, they should be given in multiple continuation sheets according to different test points Test results. If multiple frequency bands are tested at the same test point, the test result information of each frequency band is given on one page.

2.The number of the spectrogram should be consistent with the number of the attached spectrogram.

13 Analysis and conclusion

Comprehensive evaluation and conclusions are made according to the test results of each test frequency band at each test point.

1.Test the sensitivity of the system in each test frequency band.

2.A clear conclusion on whether the actual background noise value of each test frequency band (based on the spectrogram with the worst background noise) exceeds the standard is based on and the basic calculation process.

3.For signals that exceed the background noise value by 6 dB or more in the test results, at least their frequency, bandwidth, and amplitude should be given, and their Perform preliminary analysis of sources, such as. broadcast and television signals, ISM equipment signals, intermodulation signals, etc. If there are more signals, you can attach a table separately.

4.Based on the test results, give clear test conclusions and suggestions.

14 Test spectrum

The figure number and figure title should be marked below the spectrogram. The drawing numbers are arranged in order starting from 1, such as. Figure 1, Figure 2.Figure title is in accordance with the test site start frequency-stop frequency" format is named, such as. test site 1 117.975 MH z-137 MH z.

Example.