CN-122028155-A - Wireless node cooperative communication low-power consumption control method based on distributed optical fiber sensing

CN122028155ACN 122028155 ACN122028155 ACN 122028155ACN-122028155-A

Abstract

The invention discloses a wireless node cooperative communication low-power consumption control method based on distributed optical fiber sensing, and belongs to the technical field of communication fusion of distributed optical fiber sensing and the Internet of things. The method relies on a heterogeneous cooperative system formed by a distributed acoustic wave sensing (DAS) host, a central server and a wireless acoustic wave acquisition terminal, and realizes cooperative control through wireless terminal time synchronization and hardware silent loop recording, self-adaptive wake-up instruction generation, historical data cross-boundary backtracking, narrowband feature extraction and heterogeneous data fusion judgment. The invention solves the problems of high energy consumption, missing event initial data and bandwidth waste of the wireless node in the prior art, realizes low-power consumption long-acting deployment, complete event capture and high-reliability identification through DAS-guided on-demand awakening and data processing, and is suitable for safety monitoring scenes such as long-distance pipelines, power lines and the like with strict requirements on real-time response and low power consumption.

Inventors

XIAO ZIYANG
WANG HUA
LI LUMING
ZHANG ZHIGUO
GU XUELIANG

Assignees

国网江西省电力有限公司信息通信分公司

Dates

Publication Date: 20260512
Application Date: 20260410

Claims (10)

1. The wireless node cooperative communication low-power consumption control method based on distributed optical fiber sensing is characterized by comprising the following steps of: S1, configuring a wireless sound wave acquisition terminal to execute network time synchronization and hardware silence circulation recording, enabling a local clock of the wireless sound wave acquisition terminal to be consistent with reference time of a DAS host, and continuously and circularly writing audio sampling data into an annular buffer area through a hardware data transmission controller in a hardware silence circulation recording state that a radio frequency transmission module is turned off and a direct memory access controller takes over a data acquisition channel; S2, when the DAS host detects a vibration signal, the central server generates a wake-up instruction containing a self-adaptive time window and a target frequency parameter based on equipment topology information, the equivalent sound velocity of an environment medium and DAS signal confidence level and transmits the wake-up instruction to a corresponding wireless sound wave acquisition terminal; S3, after the wireless sound wave acquisition terminal is awakened, analyzing a self-adaptive time window in an awakening instruction, calculating and positioning the historical data position in the annular buffer area through logic backtracking, executing cross-boundary sectional reading and splicing, and restoring a historical signal sequence with continuous time sequence; S4, the wireless sound wave acquisition terminal extracts and compresses narrowband features of the restored historical signal sequence based on target frequency parameters in the wake-up instruction, packages and transmits feature values of target frequency points to a central server only, and then resumes a low-power consumption silent recording state; And S5, after receiving the characteristic data, the central server invokes DAS vibration data under the same space-time coordinates, and outputs a final event identification result through heterogeneous data space-time alignment, waveform similarity calculation, combined energy verification and dual-threshold hysteresis judgment.
2. The method for controlling low power consumption of wireless node cooperative communication based on distributed optical fiber sensing according to claim 1, wherein in step S1, the network time synchronization is implemented by NTP protocol, PTP protocol or custom lightweight synchronization protocol, and the time synchronization error is less than 10ms.
3. The method for controlling wireless node cooperative communication low power consumption based on distributed optical fiber sensing as claimed in claim 1, wherein in step S1, the hardware silent loop recording is specifically implemented by closing a radio frequency transmitting module and a high power consumption operation unit of a wireless sound wave acquisition terminal, taking over a data transmission channel of an analog-to-digital converter by DMA, allocating a ring buffer with continuous physical addresses in SRAM of the terminal, and setting the physical base address as The total capacity is The DMA controller responds to the sampling completion request of the ADC and automatically writes the sampling data x [ n ] into the physical address And realize the seamless coverage of data through the operation of modulo mapping, do not need CPU to intervene, the mapping relation satisfies: n is the serial number of the sampling data, and mod is the modulo operation for realizing the cyclic writing and seamless coverage of the sampling data in the ring buffer.
4. The method for controlling low power consumption in wireless node cooperative communication based on distributed optical fiber sensing according to claim 1, wherein the generating of the wake-up instruction in step S2 includes: s21, searching the coordinates of a wireless sound wave acquisition terminal closest to the DAS detection vibration position, and calling a history database to acquire the sound wave propagation actual measurement speed of the last assurance event of the position so as to update the equivalent sound velocity of the environmental medium If no history data is available, adopting a preset initial value to calculate the physical lag time of sound wave propagation The calculation formula is as follows: ; Wherein, the For the vibration location of the fiber optic cable detected by the DAS, Acquiring terminal coordinates for the latest wireless sound waves; s22, DAS signal confidence based Calculating forward redundancy of backtracking time window The calculation formula is as follows: ; Wherein, the In order to pre-set the minimum boundary of the device, At the level of the maximum coefficient of expansion, Is a threshold parameter; s23, packaging includes absolute start-stop time Wake-up instruction with target frequency parameter, wherein the start time satisfies: ; In the formula, The absolute time at which the vibration signal is detected for the DAS.
5. The wireless node cooperative communication low-power consumption control method based on distributed optical fiber sensing according to claim 4, wherein the history data position reading in step S3 is specifically: s31, acquiring wake-up time of the wireless sound wave acquisition terminal Current DMA write pointer offset According to the wake-up time And the starting moment of the data to be extracted in the instruction Combining the time differences of the terminal sampling rates Calculating the sample backtracking quantity of the data to be extracted The method comprises the following steps: ; S32, calculating the initial physical offset through a formula : In the following Is the total capacity of the ring buffer zone and is based on the wake-up time Calculating the obtained sample backtracking quantity; s33, calculating the tail residual space of the buffer area If the data length is to be read Reading data once, if Then read from the initial physical address Length data, from buffer base address And reading the residual data and splicing at the logic layer.
6. The wireless node cooperative communication low-power consumption control method based on distributed optical fiber sensing according to claim 5, wherein in step S4, the narrowband feature extraction adopts recursive digital frequency selection logic, and only integrates energy of a target frequency, the recursive digital frequency selection logic is a second-order IIR recursive algorithm, and a state variable updating rule is: Wherein C is a recursion coefficient determined by the target frequency, y n is a recovered historical signal sequence, and after narrowband feature extraction is completed, the energy amplitude of the target frequency point is output And packed for transmission.
7. The wireless node cooperative communication low-power consumption control method based on distributed optical fiber sensing as claimed in claim 4, wherein the environment medium equivalent sound velocity Periodically and adaptively updating based on actual measurement data of historical assurance events, wherein the forward redundancy of the backtracking time window Confidence with DAS signal In the form of a negative correlation, The higher the The smaller the size of the product, The lower the The larger.
8. The method for controlling low power consumption of wireless node cooperative communication based on distributed optical fiber sensing as claimed in claim 6, wherein the time-space alignment of heterogeneous data in step S5 is specifically that a wireless sound wave is used for collecting a timestamp of terminal characteristic data Generating a discrete time sequence (t [ k ]) for reference, and generating an original vibration energy sequence for DAS After anti-aliasing low-pass filtering is carried out, mapping is carried out on the discrete time sequence t [ k ] through a cubic spline interpolation algorithm, and an aligned DAS feature vector is obtained 。
9. The method for controlling low power consumption of wireless node cooperative communication based on distributed optical fiber sensing according to claim 8, wherein the waveform similarity calculation in step S5 adopts a zero-mean normalized cross-correlation algorithm, and the calculation formula is: ; wherein M is the length of the feature vector, As a result of the wireless feature vector, 、 Respectively is 、 Mean value of (2), Is a waveform similarity coefficient.
10. The method for controlling low power consumption in wireless node cooperative communication based on distributed optical fiber sensing according to claim 9, wherein the combining energy check and dual-threshold hysteresis decision in step S5 comprises: s51, calculating joint energy index : ; Wherein alpha is a system confidence coefficient weight factor; S52 trigger condition when And is also provided with Determining that an intrusion event is believed; s53, if the alarm state is already in, the condition is maintained Or (b) Maintaining an alarm state; S54 reset condition when And is also provided with When the alarm is released and the event record is filed, wherein, Is a high correlation threshold value and, Is a low correlation threshold value and, Is an energy threshold.

Description

Wireless node cooperative communication low-power consumption control method based on distributed optical fiber sensing Technical Field The invention relates to the technical field of communication fusion of distributed optical fiber sensing and the Internet of things, in particular to a wireless node cooperative communication low-power consumption control method based on distributed optical fiber sensing. Background Distributed acoustic wave sensing (DAS) technology has become an important means for infrastructure security monitoring because of the ability to utilize existing communication fiber optic cables to achieve vibration monitoring over long distances and continuous spaces. However, in the face of complex environmental noise such as wind, rain, electromagnetic interference, etc., it is difficult for a single DAS system to realize reliable event recognition, and there is a high risk of false alarm and false omission. Therefore, a technical route of 'optical fiber and wireless heterogeneous sensing cooperation' is proposed in the industry, namely, wireless acoustic wave sensing nodes deployed on key points are introduced, and space-time correlation and joint judgment are carried out by utilizing the acquired on-site audio information and DAS signals so as to improve the reliability of the whole system. However, in the system integration level for realizing the collaborative judgment, the prior art has obvious defects and restricts the large-scale and long-period application of the system. In order to carry out joint judgment, the wireless node needs to transmit the collected sound wave data back to the processing center, the battery electric quantity can be rapidly exhausted after continuous total transmission, the intermittent dormancy is difficult to capture the instant event, and the communication energy consumption of the wireless node cannot be extremely reduced on the premise of ensuring the event capturing rate in the prior art. The contradiction between trigger delay and data integrity is that the existing scheme often enables the wireless node to be in deep sleep and wake up only by means of a local simple sound pressure threshold value, and the inherent delay exists from sleep to stable acquisition of the sensor, so that the characteristic waveform of the initial stage of a key transient event is lost, the head loss of data is caused, and the accuracy and the reliability of collaborative judgment are affected. The synergy mechanism is stiff, the guiding advantages of optical fiber perception cannot be exerted, in the existing synergy scheme, the DAS system and the wireless nodes are mainly independently perceived and compared afterwards, an efficient active guiding mechanism is lacked, the DAS full-time and full-section perception results are not utilized to dynamically command the subsequent operation of the wireless nodes, and the synergy efficiency is low. The prior art lacks an intelligent cooperative communication method for realizing accurate wakeup of wireless nodes according to needs, zero-delay data acquisition and high-efficiency data transmission by taking a DAS system as a core scheduling unit. Although the technical direction of 'optical fiber and wireless heterogeneous sensing cooperation' has been proposed in the industry, the prior art, such as CN120508911B, discloses a dual-branch sound-vibration fusion event identification and positioning method based on DAS and AI, which realizes event identification and positioning through sound identification branches and vibration positioning branches, but the method belongs to a pure optical fiber sensing architecture, does not introduce wireless sensing nodes, and does not relate to the problems of energy consumption control and data acquisition integrity assurance of the wireless nodes. Another prior art CN120445386B discloses an optical fiber general sense data processing module and a monitoring and positioning method, which implement disturbance positioning by fusing DAS and DVS signals, but the system architecture is still limited to pure optical fiber sensing, and a wireless acoustic wave acquisition terminal is not introduced, so that low-power consumption cooperative control of a wireless node cannot be implemented. In summary, the prior art lacks an intelligent cooperative communication method for realizing accurate on-demand wakeup, zero-delay data acquisition and high-performance data transmission of a wireless node by taking a DAS system as a core scheduling unit. Disclosure of Invention The invention aims to provide a wireless node cooperative communication low-power consumption control method based on distributed optical fiber sensing, which aims to solve the problems that the prior art lacks a high-efficiency active guiding mechanism and does not utilize DAS full-time and full-section sensing results to dynamically command the subsequent operation of wireless nodes and has low cooperative efficiency. The technical schem