GB/T 34089-2017 in English
VALIDTest parameters and test methods for VHF/UHF frequency band radio monitoring and direction finding system in OATS
- Issued on:2017-07-31
- Implemented on:2017-11-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 34089-2017VHF/UHF无线电监测测向系统开场测试参数和测试方法》由339-2（工业和信息化部（通信））归口，主管部门为工业和信息化部（通信）。
Introduction
Interpretation of GB/T 34089—2017 National Standard of the People's Republic of China
Background and significance of standard formulation
This standard is under the jurisdiction of the Ministry of Industry and Information Technology, and the main drafting units are the National Radio Monitoring Center Testing Center and the National Radio Monitoring Center. The formulation of the standard aims to standardize the opening test of the radio monitoring and direction finding system in the VHF/UHF frequency band to ensure the performance consistency of the system in different environments.
Comparison of Standard Frameworks
| Dimensions | 2017 Standards | Comparison with Old Standards | Technology Evolution |
|---|---|---|---|
| Test Frequency Range | 30 MHz ~ 3000 MHz | - | Extended to UHF band to support modern radio technology requirements. |
| Test Environment Requirements | Open Area Test Site - No reflectors - Uniform conductivity - Avoid interfering signals | Restricted test site | Introduction of modern electromagnetic environment assessment methods. |
| Core Test Parameters |
| Basic Parameters | Newly added transient signal monitoring capability requirements. |
Interpretation of Core Test Methods
The following are the main test methods and their application cases mentioned in the standard:
1. Monitoring System Sensitivity Test
Measure the minimum detection signal field strength of the system at different frequencies through the spectrum function to ensure the system's recognition capability in a complex electromagnetic environment. For example, randomly select at least 5 test points in the range of 30 MHz to 50 MHz and record the average value of the spectrum discovery sensitivity.
2. Direction Finding System Accuracy Test
Use triangulation to evaluate the angular deviation of the direction finding system. For example, test the direction error at different azimuths at 15° intervals and calculate the root mean square error (RMS) to quantify the system performance.
3. Interference Immunity and Intermodulation Suppression
Introduce interference signals in the same frequency band to test the system's ability to maintain the main signal. For example, test the system's in-band interference immunity and third-order intermodulation suppression in the range of 500 MHz to 3000 MHz to ensure its stability in a strong electromagnetic environment.
Implementation Recommendations
To ensure the effective implementation of the standard, it is recommended to:
- Establish a standardized testing laboratory equipped with measuring equipment that meets the requirements;
- Calibrate the testing instruments regularly to ensure measurement accuracy;
- Develop differentiated testing plans for different application scenarios (mobile, fixed, and transportable systems);
- Strengthen personnel training to improve the ability to handle complex testing scenarios.
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