Full-Field Vibration Measurement via Microwave Sensing
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Solution Overview
Problem
Current non-contact vibration measurement technologies, particularly those based on microwave sensing, face challenges with clutter interference, limited range resolution, and difficulty in achieving high-precision full-field vibration measurement due to static clutter, adjacent multi-component coupling, and aliasing interference, especially when multiple interferences are coupled together.
Innovation Solution
A full-field vibration measurement method using linear frequency modulated continuous wave microwave signals transmitted by multiple antennas, with receiving antennas arranged in a linear array, performing frequency mixing and two-dimensional discrete Fourier transforms to resolve and position targets in a joint range and angle dimension, allowing for the extraction of vibration displacement time-domain information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If frequency modulated continuous wave radar is used to achieve multi-point synchronous vibration measurement, then the measurement coverage and resolution are improved, but the transmission bandwidth is limited leading to poor range resolution and serious clutter interference
Solution Approach 1:
The patent introduces angle dimension to the measurement system by using multiple receiving antennas arranged in a linear array. Instead of relying solely on range resolution which is limited by transmission bandwidth, the system resolves targets using both range and angle dimensions, achieving improved measurement precision without increasing bandwidth requirements
Solution Approach 2:
The patent divides the measurement system into multiple independent receiving channels, each corresponding to a receiving antenna. By processing signals from multiple antennas independently and combining them through two-dimensional discrete Fourier transforms, the system achieves high-resolution range and angle measurement without requiring excessive bandwidth in each individual channel
2Adaptability or versatility
If frequency modulated continuous wave radar is used to resolve multiple targets by range, then multi-point measurement capability is improved, but static clutter interference and adjacent multi-component coupling interference become serious
Solution Approach 1:
The patent adds angle dimension to the measurement space, transforming the one-dimensional range resolution problem into a two-dimensional range-angle resolution problem. This allows the system to distinguish between targets at different angles even when they are at the same range, effectively reducing static clutter interference and adjacent multi-component coupling interference
Solution Approach 2:
The patent uses angle information as an intermediary parameter to distinguish between targets. By introducing angle as an additional discrimination parameter, the system can separate targets that would otherwise be indistinguishable in the range dimension alone, effectively mitigating clutter interference
3Ease of manufacture
If measurement points are spaced apart by at least 1 to 2 range cells to be resolved, then range resolution requirement is simplified, but full-field vibration measurement becomes difficult when targets are distributed in plane and space
Solution Approach 1:
The patent resolves the measurement difficulty by introducing angle dimension. Instead of requiring measurement points to be spaced apart in the range dimension, the system uses angle information to distinguish between points at the same range, enabling full-field vibration measurement of targets distributed in three-dimensional space
Solution Approach 2:
The patent segments the measurement space into multiple angle cells within each range cell. By processing signals from multiple receiving antennas and performing two-dimensional discrete Fourier transforms, the system divides the full field of view into resolvable angular segments, enabling precise measurement of all targets in the field
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively suppresses interference, improves measurement precision, and enhances the anti-interference capability, enabling high-precision synchronous vibration measurement across a full field by migrating vibration information from the range dimension to the angle dimension and isolating interference in both range and angle dimensions.
Implementation Method 1
receiving reflected signals from targets and/or measurement points by means of a plurality of receiving antennas, and performing frequency mixing on received signals and local oscillator signals to obtain multi-channel intermediate frequency baseband signals
Implementation Method 2
extract vibration information based on phase modulation and interferometry by transmitting microwave signals of a specific form and receiving electromagnetic echo signals reflected by a target
Implementation Method 3
extract vibration information based on phase modulation and interferometry by transmitting microwave signals of a specific form and receiving electromagnetic echo signals reflected by a target
Implementation Method 4
performing two-dimensional discrete Fourier transforms to resolve and position targets in a joint range and angle dimension
Data Source
AI summary
The present invention relates to a full-field vibration measurement method based on microwave sensing, which is characterized by comprising the following steps: step 1, repeatedly transmitting linear frequency modulated continuous wave microwave signals by means of one or more transmitting antennas; step 2, receiving reflected signals from targets and/or measurement points by means of a plurality of receiving antennas, and performing frequency mixing on received signals and local oscillator signals to obtain multi-channel intermediate frequency baseband signals; step 3, acquiring intermediate frequency baseband signals in various channels, and resolving and positioning targets and/or measurement points within the full field based on a joint range and angle dimension; and step 4, extracting vibration displacement time-domain information of targets to be measured and/or measurement points. By means of the full-field vibration measurement method based on microwave sensing provided in the present invention, synchronous vibration information measurement of targets and/or measurement points within the full field is achieved by positioning and resolving the targets and/or measurement points within the full field based on a joint range-angle dimension and tracking phase evolution, thereby solving the difficulties in the prior art that full-field vibration measurement and interference suppression cannot be achieved.