GB/T 38627-2020 in English
VALIDInformation technology—Real-time positioning—Magnetic positioning data interface
- Issued on:2020-04-28
- Implemented on:2020-11-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
《GB/T 38627-2020信息技术 实时定位 磁定位数据接口》由TC28（全国信息技术标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Analysis of the core content of the standard
This standard defines the data interaction specifications between the positioning client and the positioning server of the magnetic positioning system, including:
| Module | Key parameters | Technical characteristics |
|---|---|---|
| Sensor parameters | Three-axis magnetic field strength, acceleration, angular velocity, etc. | Sampling frequency ≥ 100Hz, support magnetometer raw data and 22 high-order features |
| Positioning results | CEP error, floor accuracy, motion direction | Horizontal/vertical positioning accuracy separation, support XML structured return |
Technology Evolution Analysis
Compared with traditional RFID/Bluetooth positioning, magnetic positioning has the following advantages:
- Environmental adaptability: Utilize the inherent magnetic field characteristics of buildings, no need to deploy beacons
- Accuracy advantage: Circular Error Probability (CEP) can reach sub-meter level (the example value in the standard is 2.5m)
- Data fusion: Support multi-sensor data collaboration such as accelerometer and gyroscope
Implementation Suggestions
Typical Application Scenarios
Underground parking lot navigation: Through magnetic feature map matching realizes continuous positioning in a GPS-free environment. The case shows that the positioning success rate of a shopping mall after deployment is as high as 92%.
Development Notes
- Sensor calibration: regular hard iron/soft iron compensation
- Data preprocessing: It is recommended to use a sliding window (the standard recommends 1000 samples/window)
- Interface security: HTTP transmission requires an additional TLS encryption layer
Standard Comparison
| Standard | Positioning method | Interface type | Accuracy index |
|---|---|---|---|
| GB/T38627-2020 | Magnetic field feature matching | XML over HTTP | CEP≤3m |
| GB/T30996.1-2014 | RFID area identification | Binary protocol | Room level |
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