CN105158792A - High-frequency tectonic movement detector with novel data record format - Google Patents
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Abstract
The invention discloses a high-frequency tectonic movement detector with a novel data record format. The high-frequency tectonic movement detector comprises a vibration sensor, a data acquisition unit, a data record format module, a GPS time service module, and a controller, may acquire vibration and electromagnetic signals along with micro crack of rock deformation, and is miniature and portable, easy to conceal and install, free of attended operation, and convenient in data collection, and is suitable for being installed in a tectonic movement zone to perform near-field high-density observation. The high-frequency tectonic movement detector achieves eight parallel sampling channels so as to provide a basis for multiple parameters, a wide dynamic range, and an increase in positioning precision, is provided with a data buffer cache so as to improve data transmission performance and guarantee data integrity under a multitask concurrent condition, is provided with a single bandwidth so as to provide space for the access of a high-frequency electromagnetic sensor, and is decreased to 1.5W in power so as to prolong the service time under a battery operating condition and improve system reliability.
Description
Technical Field
The invention relates to the field of structure activity monitoring, in particular to a high-frequency structure activity detector with a novel data recording format.
Background
Modern tectonic movements (modenteric movements) are part of new tectonic movements, in particular crustal movements that occur or are occurring during the historical period of humans. It has a direct impact on human life. Besides landform research, various methods and instruments can be used for observation to research the relevant properties of modern tectonic movements. The earth's crust is in constant motion, which is expressed in various forms of tectonic activity, of which Earthquake (earth) is only one, and the Earthquake prediction should be built on the observation of the comprehensive tectonic activity. In recent years, the earthquake precursor observation technology is greatly improved, and digitization, automation, high precision and broadband recording are realized. However, the existing seismograph stations in our country have long sampling time intervals and large station intervals, and compared with the vast earth in our country, the stations far cannot meet the requirement for precursor monitoring. In the face of the current situations of few stations, incomplete types, high cost, low coverage density and the like, how to carry out multi-parameter and high-density high-frequency monitoring on the construction activities is a problem to be solved for a long time.
The signals generated by the constructive activities of different fracture scales belong to different frequency ranges. The observation shows that the fracture scale of the natural large Earthquake (Earth) is from hundreds of meters to hundreds of kilometers, and the main frequency of the generated signal is about a few hertz; the fracture scale of the microseismic (MicroEarth quare) is several meters to several hundred meters, and the main frequency of the generated signal is about tens of hertz to several hundred hertz; the dimensions of the break of the earth sound (GeoPhone) are from a few millimetres to several metres, the frequency of the generated signal being in the range of a few kilohertz; acoustic emission signals (acoustic emission) are currently mostly recorded by laboratory observation, the rupture scale is in millimeter level, and the frequency of the generated signals can reach tens of kilohertz.
Natural major earthquakes result from the massive fracturing of crust rock. All large scale fractures are formed by the gradual expansion of the links, starting with small scale fractures. Therefore, observation of high-frequency signals inside the earth's crust is necessary and meaningful. Through observation of high-frequency signals, frequency abnormity of micro fracture signals generated by medium-strong earthquake and even crustal motion before earthquakes can be found, and analysis and research of earthquake precursors are developed from the field of high-frequency signal activity.
At present, the method is still lacked in the field of small and ultrahigh frequency observation and construction activity signals, and cannot meet the requirement of comprehensive monitoring of construction activities in time and space. For some signals with higher frequencies, such as earth sound, or signals with rich frequency components, such as electromagnetic signals; the observation requirement can be met only by using a high-speed sampling instrument with high resolution, otherwise, the problems of loss of high-frequency component signals, distortion of acquired signals and the like can be caused, and the analysis and research of observed data are deviated and even misjudged. The current observation station has lower sampling frequency in terms of time resolution and lacks observation and acquisition of high-frequency information for constructing activities; in terms of spatial resolution, the floor area of an existing single station generally reaches hundreds of square meters, a population area is not favorable for high-density arrangement, but the large-density arrangement is difficult to realize in an area with poor conditions in a non-population area due to the limitation that the station needs to be attended.
Disclosure of Invention
In order to solve the above technical problem, the present invention provides a high frequency structure activity detector with a novel data recording format, which is characterized by comprising: the system comprises a vibration sensor, a data acquisition unit, a data recording format module, a GPS time service module and a controller; wherein,
the vibration sensor is respectively connected with the data acquisition device, the controller and the data recording format module, and is used for sensing and acquiring ultrahigh frequency signals generated by construction activities, digitizing the ultrahigh frequency signals and transmitting the digitized ultrahigh frequency signals to the controller and the data recording format module;
the data acquisition unit is an 8-channel data acquisition unit, is respectively connected with the vibration sensor, the data recording format module, the GPS time service module and the controller, and is used for receiving the analog signal sent by the vibration sensor and the time service pulse signal sent by the GPS time service module according to an indication signal of the controller, performing analog-to-digital conversion on the signals and sending a generated digital signal to the data recording format module;
the data recording format module is respectively coupled with the data collector and the GPS time service module and is used for recording digital signals sent by the data collector and digital clock signals sent by the GPS time service module, and the data recording format module divides the collected digital signals into original data files, index compression files of the original data and GPS time service files;
the GPS time service module is respectively connected with the data acquisition unit, the controller and the data recording format module and is used for receiving digital clock data and time service pulse signals from a GPS satellite according to the indication signals of the controller, and the pulse signals and the clock data are stored in each data file according to the rule of the data recording format module after being digitalized; the controller is respectively connected with the vibration sensor, the data acquisition device and the GPS time service module, and is used for sending corresponding instructions to the vibration sensor, the data acquisition device and the GPS time service module, collecting and storing information sent by the vibration sensor, the data acquisition device and the GPS time service module, receiving the instructions and operating according to a design mode.
Preferably, the method further comprises the following steps: and the 220V alternating current converter or the 220V direct current converter is respectively coupled with the vibration sensor, the data acquisition unit, the data recording format module, the GPS time service module and the controller and is used for providing current.
Preferably, the data recording format module exchanges and transmits data with an external device through a WiFi, bluetooth, USB, RJ45 or SATA interface provided by the controller.
Preferably, the vibration sensor is further a three-way or one-way vibration sensor.
Preferably, the vibration sensor is in the shape of a square cylinder or a cylinder.
Compared with the prior art, the high-frequency structure activity detector with the novel data recording format achieves the following effects:
(1) the utility model provides a vibration and electromagnetic signal that the rock deformation micro-fracture accompanies can be acquireed to this application, have miniaturized portable, easily concealed installation need not on duty, and characteristics such as convenient data collection are fit for the direct mount and carry out near field high density observation in constructing the activity zone.
(2) The sampling channel is added to be parallel with eight channels, and a foundation is laid for multi-parameter, wide dynamic and positioning precision improvement; the data transmission performance is improved by adding the data cache region, and the data integrity under the condition of multi-task concurrency is ensured; increasing the signal bandwidth leaves space for the access of the high-frequency electromagnetic sensor; the power is reduced to 1.5W, the working time under the condition of battery power supply can be prolonged, and the reliability of the system is improved.
(3) The application adds various interfaces, and provides hardware interfaces for fast local downloading and remote uploading of data.
(4) Various vibration sensor shapes can be adapted to different requirements, seismic bases or boreholes.
(5) The standardized data structure and the standard file name generation rule are unified, and the synchronous data index is used for facilitating real-time data transmission, remote analysis and subsequent data processing; the sampling channel, the sampling frequency and the file length can be selected to adapt to different use schemes and different sensors; the sampling frequency is 10 KHz.
(6) The GPS time service pulse record ensures that the time service precision and the sampling synchronism among all the collectors are not lower than 1 mS.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a structural diagram of a high-frequency structured activity detector having a novel data recording format according to example 1;
FIG. 2 is a block diagram of a high frequency construction activity detector having a novel data recording format according to example 2.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. Furthermore, the term "coupled" is intended to encompass any direct or indirect electrical coupling. Thus, if a first device couples to a second device, that connection may be through a direct electrical coupling or through an indirect electrical coupling via other devices and couplings. The following description is of the preferred embodiment for carrying out the invention, and is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.
The present invention will be described in further detail below with reference to the accompanying drawings, but the present invention is not limited thereto.
Example 1:
with reference to fig. 1, the present application provides a high frequency texture activity detector with a novel data recording format, comprising: the system comprises a vibration sensor 101, a data acquisition unit 102, a data recording format module 103, a GPS time service module 104 and a controller 105; wherein,
the vibration sensor 101 is respectively connected with the data acquisition device 102, the controller 105 and the data recording format module 103, and is used for sensing and acquiring ultrahigh frequency signals generated by construction activities, digitizing the ultrahigh frequency signals and transmitting the digitized ultrahigh frequency signals to the controller 105 and the data recording format module 103;
the data acquisition unit 102 is an 8-channel data acquisition unit 102, and is respectively connected to the vibration sensor 101, the data recording format module 103, the GPS time service module 104 and the controller 105, and configured to receive the analog signal sent by the vibration sensor 101 and the time service pulse signal sent by the GPS time service module 104 according to an indication signal of the controller 105, perform analog-to-digital conversion on the signals, and send a generated digital signal to the data recording format module 103;
the data recording format module 103 is respectively coupled to the data acquisition unit 102 and the GPS time service module 104, and is configured to record a digital signal sent by the data acquisition unit 102 and a digital clock signal sent by the GPS time service module 104, where the data recording format module 103 divides the acquired digital signal into an original data file, an index compression file for the original data, and a GPS time service file;
the GPS time service module 104 is connected to the data recording format module 103, the controller 105, and the data recording format module 103, respectively, and configured to receive the digital clock data and the time service pulse signal from the GPS satellite according to an indication signal of the controller 105, where the pulse signal is digitized and then stored in each data file together with the clock data according to a rule of the data recording format module; the data files are original data files, index compressed files of the original data and GPS time service files;
the controller 105 is connected to the vibration sensor 101, the data collector 102 and the GPS time service module 104, and configured to send corresponding instructions to the vibration sensor 101, the data collector 102 and the GPS time service module 104, collect and store information sent by the vibration sensor, the data collector and the GPS time service module, receive the instructions, and operate according to a design mode.
The data recording format module 103 is connected with the data acquisition unit through a WiFi, bluetooth, USB, RJ45 or SATA interface. In this embodiment, the connection is performed through a USB interface.
The vibration sensor 101 is further a three-way or one-way vibration sensor 101.
The sensor is in the shape of a square cylinder or a cylinder. The shape of the sensor in this embodiment is a square cylinder.
The data files generated by the data recording format module have specific data structures, and the files have specific index relationships. In the real-time data acquisition process, a group of files, hereinafter referred to as a record file group, is stored in each unit record time period. The length of the unit recording period is specified by a user, 1 hour is recommended, and in practical application, a file of 2 hours or half an hour can be set. After a unit period of time elapses from the start of recording, the current file is closed, and a new file is created. Since the USB data interface must be transferred in blocks (integer multiples of 256), the data within a unit period file may not be exactly equal to the period length (typically slightly shorter than the user specified length). Each record file group consists of two files, and one file stores all data, which are referred to as data files for short; the other is real-time simplified index data of the data file, which is called the index file for short. The two files store data synchronously in parallel in the sampling process. All information in the index file may be re-indexed from the data file. And (3) automatically establishing a corresponding new file directory every time a record is started (including system restart, user stop sampling, disk storage and restart), and keeping and storing subsequent files in the directory without interruption.
Both files adopt a block storage structure, namely data blocks are used as basic storage units, and the data blocks are accumulated one by one to form a data file. The basic structure of a data block consists of two parts, a block header and a data body. The block header describes information related to the data, and the data body stores basic data.
After the data is uploaded, the index files can be further processed, all the index files of the same group of data files can be simply combined, and the index files can also be re-indexed.
In addition, for accurate time setting, each acquisition unit independently and synchronously records the GPS time service data and the microsecond clock of the controller 105. The file adopts a simple line recording mode, and one line of recording is added every time tick. The next GPS file per directory.
Expected file maximum capacity (number of data header bytes not calculated):
data file: 10K (sample point/sec) × 7 (channel) × 2(Byte) × 3600 ═ 504000Kbyte about 504 MByte/hr
Index file: 7 (channel) × 4(Byte) × 1 (variance) +1 (mean) +1 (maximum) +1 (minimum) +1 (start pointer) +1 (end pointer) × 7200(0.5 sec per record) ═ 1209600Bytes about 1.3 mbytes/hour
GPS time service file: 60Byte (existing record entry length) × 144(10 minute interval, time to tick each day) … … 365(1 year) ═ 3153600Byte approximately 3.2 MByte/year.
The time service precision of the ultrahigh frequency structure activity monitor reaches 1 millisecond, and therefore, a timing value of microsecond resolution provided by a control main board (hereinafter referred to as a control board microsecond timer) is recorded in data segment recording parameters of data acquisition. Because the microsecond timer of the control board has poor stability and drifts for several seconds every day, the microsecond timer of the GPS is used for timing and calibrating. Because the time of reaching the calibration pulse and the beat of the sampling process cannot be synchronized, the calibration process is not recorded in a data file, and a GPS time service file is recorded through another independent thread. A mode of adding a GPS calibration file under each data file directory is adopted, and calibration parameters are recorded. The key point is that the timing value of a microsecond timer of a control board for storing the arrival time of the GPS time-setting pulse in pairs and the time of the GPS pulse, and some GPS positions and satellite state parameters are also provided. By using the file, a drift calibration function of the microsecond timer of the control board can be established, the drift state of the control board is evaluated, and the time service precision is ensured.
Example 2:
with reference to fig. 2, the present application provides a high frequency texture activity detector with a novel data recording format, comprising: the system comprises a vibration sensor 201, a data acquisition unit 202, a data recording format module 203, a GPS time service module 204 and a controller 205; wherein,
the vibration sensor 201 is respectively connected with the data acquisition device 202, the controller 205 and the data recording format module 203, and is used for sensing and acquiring ultrahigh frequency signals generated by construction activities, digitizing the ultrahigh frequency signals and transmitting the digitized ultrahigh frequency signals to the controller 205 and the data recording format module 203;
the data acquisition unit 202 is an 8-channel data acquisition unit 202, and is respectively connected to the vibration sensor 201, the data recording format module 203, the GPS time service module 204, and the controller 205, and configured to receive the analog signal sent by the vibration sensor 201 and the time service pulse signal sent by the GPS time service module 204 according to an indication signal of the controller 205, perform analog-to-digital conversion on the signals, and send a generated digital signal to the data recording format module 203;
the data recording format module 203 is respectively coupled to the data acquisition unit 202 and the GPS time service module 204, and is configured to record a digital signal sent by the data acquisition unit 202 and a digital clock signal sent by the GPS time service module 204, where the data recording format module 203 divides the acquired digital signal into an original data file, an index compression file for the original data, and a GPS time service file;
the GPS time service module 204 is connected to the data recording format module 203, the controller 205, and the data recording format module 203, and configured to receive the digital clock data and the time service pulse signal from the GPS satellite according to the indication signal of the controller 205, where the pulse signal is digitized and then stored in each data file together with the clock data according to the rule of the data recording format module; the data files are original data files, index compressed files of the original data and GPS time service files;
the controller 205 is connected to the vibration sensor 201, the data collector 202 and the GPS time service module 204, and configured to send corresponding instructions to the vibration sensor 201, the data collector 202 and the GPS time service module 204, collect and store information sent by the vibration sensor, the data collector and the GPS time service module, receive the instructions, and operate according to a design mode.
The data recording format module 203 is connected with the data acquisition unit through a WiFi, bluetooth, USB, RJ45 or SATA interface. In this embodiment, the connection is performed through a bluetooth interface.
The vibration sensor 201 is further a three-way or one-way vibration sensor 201.
The sensor is in the shape of a square cylinder or a cylinder. In this embodiment, it is cylindrical.
This embodiment still includes: a 220V ac converter or dc converter 206, in this embodiment, the 220V ac converter 206, is respectively coupled to the vibration sensor 201, the data collector 202, the data recording format module 203, the GPS time service module 204, and the controller 205, and is configured to provide current.
The ultrahigh frequency structure activity monitor is an instrument designed based on an unattended operation and automatic operation concept, and all data generated by the ultrahigh frequency structure activity monitor are automatically stored in related files according to a preset structure. When the instrument is powered on and started, under the control of two sets of self-developed special software, namely an MERecorder and a GPSClock, the current directory and the file name are automatically generated, the set file structure is used for collecting and storing data, and the machine automatically and continuously generates a new file name to obtain the content of a filling file. Unless manual intervention ceases, new parameters are entered and the process does not stop. Once manually set, the system continues to operate in a unified format.
The data files generated by the data recording format module 203 of the present application have a specific data structure, and the files have a specific index relationship, which is specifically as follows:
(1) data file group architecture — that is, within the same period of time, a pair of files is recorded at the same time, one is an original data file (· HFMED), and the other is an index compressed file (·. HFIDX) for the original data.
The instrument has 8 data acquisition channels, can continuously work at the acquisition speed of 1 ten thousand data points per channel per second, and can produce hundreds of GBytes data every day for years. The first big problem faced by such high frequency multi-channel continuous recording is the big data management, uploading problem. The original data file contains details of high-frequency data, but the uploading, unloading and reading efficiency is low due to the large data volume. For this purpose, a synchronization index compressed file is designed. This design has two effects:
1.1: in the real-time recording phase, the original data file does not need to be uploaded through the network, and the flow can block the network. The index file is uploaded in real time. Through the analysis of the index file, the seismic signals in the index file can be found. The section of seismic data can be directly called through a network according to the original data file pointer contained in the index file. Therefore, on one hand, the smooth network is ensured, and the requirement for obtaining high-frequency signals can be met.
1.2: in the later data comprehensive analysis stage, data from a plurality of high-frequency monitors are read simultaneously to calculate earthquake parameters, for example, calculation of a plurality of joint positioning, so that the data to be read can reach dozens of TBytes. It is almost impossible to read the original file directly. The index file with the compression rate close to 1/400 is read, so that the speed of data browsing and retrieval can be greatly increased. When the details of the data need to be observed, a certain section in the original data file can be automatically positioned and read through the index file software, and the data burden is not large.
(2) The block storage architecture inside the data file, namely, continuously collected original data, is stored in the file in sequence according to a fixed-length data block, and each block of index data in the index file corresponds to each block of original data in the original data file.
For continuously acquired data, a two-dimensional table continuous storage mode is not adopted, and a segmented storage mode is adopted. Such a treatment brings the following advantages:
2.1 because of the clock of the hardware system, the clock of the control plate band and the sampling beat of the collector can not be made to be stable for a long time on the millisecond level, and the clock does not drift. For example, the amount of embedded control motherboard drift per day may typically amount to several seconds. Thus, by data blocking, a block parameter header is added to each data block, in which the current controller clock is recorded, which is calibrated once by GPS at a certain time (typically 10 minutes to 1 hour). This eliminates timing errors due to long term cumulative drift.
2.2 the header of the data block also contains an important feature code FeatureCode, which is assigned a constant "HFME". This is an identifier embedded in the header of each segment, and its role is to ensure that data can be restored as soon as possible when the data file is partially corrupted. The ultrahigh frequency structure activity monitor is formed by combining dozens of monitors, and a large amount of data is necessarily generated in the expected working time of years. Due to defects of hardware, software bugs and the influence of working environment, the problems of damage, dislocation and the like of data recording files are difficult to avoid. Without signature control, a data file is corrupted by one byte, which can make the data in the entire file difficult to read. The existence of the feature code enables a user to track data in a file in a segmented manner, and the feature code can be used for judging that the data is the starting point of a segment of data. Further analysis of the local data structure makes it possible to save a large part of the information in the corrupted file in segments.
The choice of the 2.3 block structure is also actually derived from the definition of the hardware acquisition structure. The USB interface is used, and a block transmission mode is adopted through the data buffer area, so that the optimal mode of high-speed data acquisition is realized. When we store data, it is an efficient way to add parameter information to the front of the data transmission block for storing.
(3) Additional GPS time service file (x. HFGPS)
The time service precision requirement of the ultrahigh frequency structure activity monitor reaches 1 millisecond, and therefore a timing value of microsecond resolution provided by a control main board (hereinafter referred to as a control board microsecond timer) is recorded in data section recording parameters of data acquisition. Because the microsecond timer of the control board has poor stability and drifts for several seconds every day, the microsecond timer is calibrated by using the timing of the GPS second pulse timer. Because the time of reaching the calibration pulse and the beat of the sampling process cannot be synchronized, the calibration process is not recorded in a data file, and a GPS time service file is recorded through another independent thread. A GPS calibration file is added under each data file directory, and calibration parameters are recorded. The key point is that the timing value of a microsecond timer of a control board for storing the arrival time of the GPS time-setting pulse in pairs and the time of the GPS pulse, and some GPS positions and satellite state parameters are also provided. By using the file, a drift calibration function of the microsecond timer of the control board can be established, the drift state of the control board is evaluated, and the time service precision is ensured.
(4) File name and directory management structure
The data recording format of the ultra-high frequency structure activity monitor also comprises the definition of an automatic management structure of a file name and a storage directory. The file name naming rule is as shown in example 1.
This automatic management of file names and directories has the following advantages:
4.1 the file directories can be clearly organized without errors, and the only one directory corresponding to each starting storage is ensured.
4.2 the files can be named sequentially one by one in an increment mode, and data are guaranteed to be read accurately and sequentially.
The foregoing description shows and describes several preferred embodiments of the invention, but as aforementioned, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A high frequency texture activity detector having a novel data recording format, comprising: the system comprises a vibration sensor, a data acquisition unit, a data recording format module, a GPS time service module and a controller; wherein,
the vibration sensor is respectively connected with the data acquisition device, the controller and the data recording format module, and is used for sensing and acquiring ultrahigh frequency signals generated by construction activities, digitizing the ultrahigh frequency signals and transmitting the digitized ultrahigh frequency signals to the controller and the data recording format module;
the data acquisition unit is an 8-channel data acquisition unit, is respectively connected with the vibration sensor, the data recording format module, the GPS time service module and the controller, and is used for receiving the analog signal sent by the vibration sensor and the time service pulse signal sent by the GPS time service module according to an indication signal of the controller, performing analog-to-digital conversion on the signals and sending a generated digital signal to the data recording format module;
the data recording format module is respectively coupled with the data collector and the GPS time service module and is used for recording digital signals sent by the data collector and digital clock signals sent by the GPS time service module, and the data recording format module divides the collected digital signals into original data files, index compression files of the original data and GPS time service files;
the GPS time service module is respectively connected with the data acquisition unit, the controller and the data recording format module and is used for receiving digital clock data and time service pulse signals from a GPS satellite according to the indication signals of the controller, and the pulse signals and the clock data are stored in each data file according to the rule of the data recording format module after being digitalized; the controller is respectively connected with the vibration sensor, the data acquisition device and the GPS time service module, and is used for sending corresponding instructions to the vibration sensor, the data acquisition device and the GPS time service module, collecting and storing information sent by the vibration sensor, the data acquisition device and the GPS time service module, receiving the instructions and operating according to a design mode.
2. The high frequency texture activity detector with a novel data recording format as claimed in claim 1, further comprising: and the 220V alternating current converter or the 220V direct current converter is respectively coupled with the vibration sensor, the data acquisition unit, the data recording format module, the GPS time service module and the controller and is used for providing current.
3. The high frequency texture activity detector with novel data recording format as claimed in claim 1, wherein the data recording format module exchanges and transmits data with external devices through WiFi, bluetooth, USB, RJ45 or SATA interfaces provided by the controller.
4. A high frequency texture activity detector as claimed in claim 1 wherein the vibration sensor is further a three-way or one-way vibration sensor.
5. A high frequency structure activity detector with novel data recording format according to claim 1 or 4, characterized in that the shape of said vibration sensor is a square cylinder or a cylinder.
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| CN114543875A (en) * | 2022-01-13 | 2022-05-27 | 中国民用航空飞行学院 | Anti-interference satellite navigation equipment detecting system of big dipper |
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