QX/T 587-2020 in English
VALIDSpecifications for tests of technical equipment specialized for meteorological observation—Upper-air meteorological observation instrument
- Issued on:2020-12-29
- Implemented on:2021-04-15
- File Format:PDF
- Delivery:Via email within 1~3 business days
$262.00
Introduction
Analysis of the core content of the standard
| Test dimensions | Sounding instrument | Ground equipment | Detection box |
|---|---|---|---|
| Number of samples | ≥120 (divided into 5 groups) | 3 units/category | 3 units |
| Key indicators | Carrier frequency stability≤0.5MHz | Receiving sensitivity≤-110dBm | Temperature field uniformity≤0.3℃ |
| Special requirements | Resistant to 20 times the release weight | Minimum elevation angle ≥5° | Humidity rise rate ≥1%RH/min |
Technology evolution and test innovation
This standard incorporates the satellite navigation sonde wind measurement module into the specification for the first time, requiring the test:
- Cold start positioning time: ≤60 seconds (23℃ environment)
- Hot start positioning time: ≤15 seconds (-30~50℃)
- Positioning error: horizontal ≤15m, elevation ≤20m
Compared with QX/T36-2005 standard, new electromagnetic compatibility test (GB/T17626 series) and environmental stress screening (ESS) requirements are added.
Implementation points and suggestions
Test process optimization
- Dynamic comparison test shall preferably adopt same ball release method, including at least 5 precipitation condition tests
- Electrical performance test shall be carried out in microwave darkroom to avoid multipath interference
- Humidity sensor test shall avoid -5~5℃ range to prevent icing error
Common problem handling
When the wet-bulb evaporated water in the radiosonde detection box directly blows the sensor, the test shall be terminated immediately and judged as unqualified. Suggested improvement plan:
- Install airflow guide device
- Use PT100 to replace ventilation psychrometer
- Add humidity buffer chamber
Standard application case
A certain type of GPS sonde has a carrier frequency offset of 1.2MHz in a -50℃ environment, which exceeds the 0.5MHz limit specified in the standard. Through:
- Improve crystal oscillator temperature compensation circuit
- Add RF shielding layer
- Optimize power management module
Finally, the low-temperature frequency stability is controlled within 0.3MHz, meeting the requirements of QX/T587-2020.
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