Calibrating Auxiliary Receivers with Reference Device for EM Field Measurement
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Solution Overview
Problem
Current methods lack accurate evaluation standards for the shielding effectiveness of buildings against electromagnetic wave attacks, particularly for social infrastructure, as existing technologies do not account for the complex scattering and attenuation of electromagnetic waves within general large-scale buildings made from materials with varying shielding effects.
Innovation Solution
An electromagnetic wave measurement system utilizing a high-precision reference receiving device and multiple auxiliary receiving devices, with a control device that collects and calibrates frequency-specific measurement values to determine electromagnetic wave attenuation characteristics within a measurement target space, allowing for precise measurement of electromagnetic wave distribution and shielding effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single high-precision receiving device is used to measure electromagnetic wave distribution at multiple points, then measurement precision is improved, but measurement time and device complexity increase
Solution Approach 1:
The receiving device is segmented into a reference receiving device with high precision and multiple auxiliary receiving devices with lower precision. The reference device measures at one point while auxiliary devices measure at multiple other points simultaneously, dividing the measurement task to reduce time while maintaining overall precision through calibration.
Solution Approach 2:
The reference receiving device acts as an intermediary that provides calibration data for the auxiliary receiving devices. By measuring at the same location and using its high-precision measurements to calibrate the auxiliary devices, the system enables accurate multi-point measurement without requiring all devices to be high-precision, thus reducing measurement time.
2Loss of time
If multiple high-precision receiving devices are used to measure electromagnetic wave distribution simultaneously, then measurement time is reduced, but device complexity and cost increase
Solution Approach 1:
Different receiving devices have different precision levels appropriate for their specific roles. The reference receiving device has high precision for calibration purposes, while auxiliary receiving devices have lower precision sufficient for their measurement tasks. This local differentiation of quality reduces overall system complexity and cost while maintaining measurement efficiency.
3Device complexity
If auxiliary receiving devices with lower precision are used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The reference receiving device provides feedback calibration information to the auxiliary receiving devices. The control device uses measurements from the high-precision reference device to generate calibration information that corrects and improves the precision of the auxiliary devices' measurements, allowing lower-precision hardware to achieve accurate results through feedback-based calibration.
4Reliability
If shielding facilities are designed based on military standards with direct exposure assumption, then shielding effectiveness is overestimated, but adaptability to real-world scenarios deteriorates
Solution Approach 1:
The measurement system changes the evaluation parameters from military-standard direct exposure metrics to real-world distributed electromagnetic wave distribution metrics. By measuring at multiple points and analyzing the actual distribution patterns within buildings, the system adapts the shielding effectiveness evaluation to reflect real-world conditions where electromagnetic waves scatter and attenuate through building structures.
Data Source
AI summary
An electromagnetic wave measurement system may include: a reference receiving device; a plurality of auxiliary receiving devices; and a control device connected to the reference receiving device and the plurality of auxiliary receiving devices, wherein the reference receiving device has a wider dynamic range than the plurality of auxiliary receiving devices, the control device collects a frequency-specific measurement value from each of the reference receiving device and the plurality of auxiliary receiving devices, and the frequency-specific measurement value of each of the auxiliary receiving devices is calibrated based on the frequency-specific measurement value of the reference receiving device.