A GNSS measurement terminal and system based on MEMS wake-up mechanism

Abstract

The invention relates to a GNSS measurement terminal and system based on a MEMS wake-up mechanism. The GNSS measurement terminal comprises: a power supply circuit, a power supply control circuit, a microprocessor, a MEMS acceleration sensor, an RTC real-time clock circuit, and a GNSS module; the microprocessor is respectively connected to the MEMS acceleration sensor, the RTC real-time clock circuit, the power supply control circuit, and the GNSS module; the power supply control circuit is also connected to the GNSS module; the power supply circuit is respectively connected to the microprocessor and the power supply control circuit, and is used to supply power to the microprocessor and the power supply control circuit; the MEMS acceleration sensor is used to collect vibration acceleration data at the location of the GNSS measurement terminal; the microprocessor is used to control the closing or opening of a switch connected to the GNSS module in the power supply control circuit according to the time and vibration acceleration data recorded by the RTC real-time clock circuit, so as to start or shut down the GNSS module.

Description

Technical Field

[0001] The present invention relates to the technical field of geological disaster monitoring and early warning, and in particular to a GNSS measurement terminal and system based on a MEMS wake-up mechanism. Background Art

[0002] At present, the most commonly used geological disaster monitoring and early warning equipment in geological disaster emergency monitoring is GNSS monitoring terminal equipment. GNSS can perform high-precision deformation and displacement measurements on geological disaster bodies, and has the characteristics of high precision, automation, and all-weather real-time monitoring. It provides an effective technical means for monitoring and early warning of sudden and typical geological disasters such as landslides, collapses, and mudslides. Geological disaster monitoring equipment with GNSS technology as the core consumes a lot of power, and it is difficult to provide mains power to its monitoring terminal at the site of typical geological disaster emergency monitoring.

[0003] Existing GNSS emergency monitoring terminals can be divided into two categories according to the working mode for deformation and displacement monitoring of geological disaster bodies: the first category is continuous monitoring all day long. This type of terminal consumes a lot of power, and in order to ensure sufficient working time, a very large battery pack is required to power it. Large battery packs are very bulky, which makes this type of solution not very suitable for emergency monitoring with high portability requirements. The second category is scheduled monitoring by GNSS emergency monitoring terminals. The deformation and displacement monitoring of geological disaster bodies is completed once every several hours. Although this method can greatly reduce the power consumption of the terminal, if there is a large deformation or displacement during the period when the GNSS emergency monitoring terminal is turned off or on standby, the GNSS emergency monitoring terminal cannot obtain monitoring data, resulting in the omission of key disaster and danger data, and more seriously, it will lead to the loss of precious opportunities for geological disaster warnings.

[0004] Therefore, there is an urgent need for a GNSS measurement terminal that can extend the working time of the entire device, not miss key disaster and danger data, and effectively grasp the precious opportunity for geological disaster warning. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a GNSS measurement terminal and system based on a MEMS wake-up mechanism, which solves the technical problem of short working time caused by high power consumption of GNSS monitoring terminals in the prior art.

[0007] (II) Technical solution

[0008] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0009] In a first aspect, an embodiment of the present invention provides a GNSS measurement terminal based on a MEMS wake-up mechanism, including:

[0010] Power supply circuit, power supply control circuit, microprocessor, MEMS acceleration sensor, RTC real-time clock circuit, GNSS module;

[0011] The microprocessor is respectively connected to a MEMS acceleration sensor, an RTC real-time clock circuit for recording time, a power control circuit, and a GNSS module;

[0012] The power control circuit is also connected to the GNSS module;

[0013] The power supply circuit is connected to the microprocessor and the power supply control circuit respectively, and is used to supply power to the microprocessor and the power supply control circuit connected thereto;

[0014] The MEMS acceleration sensor is used to collect vibration acceleration data at the location of the GNSS measurement terminal;

[0015] The microprocessor is used to control the closing or opening of the switch connected to the GNSS module in the power control circuit to start or shut down the GNSS module connected to the power control circuit according to the time recorded by the RTC real-time clock circuit and the vibration acceleration data collected by the MEMS acceleration sensor.

[0016] Preferably, according to the time recorded by the RTC real-time clock circuit and the vibration acceleration data collected by the MEMS acceleration sensor, controlling the closing or opening of the switch connected to the GNSS module in the power control circuit to start or shut down the GNSS module connected to the power control circuit specifically includes:

[0017] The microprocessor determines whether the time recorded by the RTC real-time clock circuit reaches a preset time point;

[0018] If the time recorded by the RTC real-time clock circuit reaches the set time point, the microprocessor controls the closing of a switch in the power control circuit connected to the GNSS module to supply power to the GNSS module;

[0019] If the time recorded by the RTC real-time clock circuit has not reached the set time point, the microprocessor determines whether there is a motion over-limit signal at the location of the GNSS measurement terminal based on the vibration acceleration data collected by the MEMS acceleration sensor and a preset threshold value, and obtains a judgment result;

[0020] If the judgment result is that there is a motion over-limit signal at the location of the GNSS measurement terminal, the microprocessor controls the closing of a switch in the power control circuit connected to the GNSS module to supply power to the GNSS module.

[0021] Preferably,

[0022] The GNSS module is used to collect deformation and displacement data of the geological disaster body after being connected to the power circuit when the switch connected to the GNSS module in the control power control circuit is closed, and upload the collected deformation and displacement data of the geological disaster body to the microprocessor.

[0023] Preferably,

[0024] The microprocessor is also used to control the disconnection of the switch connected to the GNSS module in the power control circuit after receiving the deformation and displacement data of the geological disaster body collected by the GNSS module, thereby cutting off the power of the GNSS module.

[0025] Preferably, if the time recorded by the RTC real-time clock circuit has not reached the set time point, the microprocessor determines whether there is a motion over-limit signal at the location of the GNSS measurement terminal based on the vibration acceleration data collected by the MEMS acceleration sensor and a preset threshold value, and obtains a judgment result; specifically including:

[0026] The microprocessor samples the vibration acceleration data collected by the MEMS acceleration sensor at a preset time interval to obtain sampled data of the vibration signal acceleration data;

[0027] The sampling data of the vibration signal acceleration data includes: 1 , x 2 , x 3 ...x i ...x N ;

[0028] Among them, x i is the acceleration data of the i-th vibration signal sampled;

[0029] The microprocessor observes the sampled data of the acceleration data of the vibration signal using a time sliding window that slides in real time with time, and obtains the initial power of the abnormal vibration signal based on formula (1);

[0030] The formula (1) is:

[0031]

[0032] P p is the initial power of abnormal vibration signal;

[0033] L is the width of the long time window in the time sliding window;

[0034] S is the width of the short time window in the time sliding window;

[0035]

[0036] x j is the jth vibration signal acceleration data sampled; where j=i+1-S;

[0037] It is the mean value of the acceleration data of the vibration signal in the short time window of the time sliding window;

[0038]

[0039] It is the mean value of the acceleration data of the vibration signal in the long time window in the time sliding window;

[0040] x k is the kth vibration signal acceleration data sampled; where k=i+1-L;

[0041] The microprocessor determines the initial power P of the abnormal vibration signal p Is it greater than a preset threshold? If the initial power P of the abnormal vibration signal is p If the initial power P of the abnormal vibration signal is greater than a preset threshold, it is determined that there is a motion over-limit signal at the location of the GNSS measurement terminal; p If the value is less than or equal to a preset threshold, it is determined that there is no motion over-limit signal at the location of the GNSS measurement terminal.

[0042] Preferably,

[0043] The width S of the short time window of the time sliding window is 0.2s.

[0044] Preferably,

[0045] The width L of the long time window of the time sliding window is 3s.

[0046] On the other hand, the present embodiment provides a GNSS measurement system based on a MEMS wake-up mechanism, characterized in that the system comprises any of the above-mentioned GNSS measurement terminals based on a MEMS wake-up mechanism;

[0047] The system also includes: a communication circuit and a server;

[0048] The microprocessor in the GNSS measurement terminal based on the MEMS wake-up mechanism is connected to the server through the communication circuit.

[0049] Preferably,

[0050] The microprocessor in the GNSS measurement terminal based on the MEMS wake-up mechanism is also used to upload the data information uploaded by the GNSS module to the server platform through the communication circuit.

[0051] Preferably,

[0052] The power supply circuit includes a solar panel.

[0053] (III) Beneficial effects

[0054] The beneficial effects of the present invention are as follows: a GNSS measurement terminal and system based on a MEMS wake-up mechanism of the present invention, due to the use of a MEMS acceleration sensor, a microprocessor can control the closing or opening of a switch connected to the GNSS module in the power control circuit according to the time recorded by the RTC real-time clock circuit and the vibration acceleration data collected by the MEMS acceleration sensor to start or shut down the GNSS module connected to the power control circuit, thereby extending the working time of the entire device, not missing key disaster and danger data, and effectively grasping the precious opportunity for geological disaster warning. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a structural schematic diagram of a GNSS measurement terminal based on a MEMS wake-up mechanism of the present invention;

[0056] Figure 2 The figure is a schematic diagram of the structure of a GNSS measurement system based on a MEMS wake-up mechanism of the present invention. DETAILED DESCRIPTION

[0057] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0058] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0059] See also Figure 1 This embodiment provides a GNSS measurement terminal based on a MEMS wake-up mechanism, including:

[0060] Power supply circuit, power supply control circuit, microprocessor, MEMS acceleration sensor, RTC real-time clock circuit, GNSS module.

[0061] The microprocessor is respectively connected with a MEMS acceleration sensor, an RTC real-time clock circuit for recording time, a power control circuit, and a GNSS module.

[0062] The power control circuit is also connected to the GNSS module.

[0063] The power supply circuit is connected to the microprocessor and the power supply control circuit respectively, and is used to supply power to the microprocessor and the power supply control circuit connected thereto.

[0064] The MEMS acceleration sensor is used to collect vibration acceleration data at the location of the GNSS measurement terminal.

[0065] The microprocessor is used to control the closing or opening of the switch connected to the GNSS module in the power control circuit to start or shut down the GNSS module connected to the power control circuit according to the time recorded by the RTC real-time clock circuit and the vibration acceleration data collected by the MEMS acceleration sensor.

[0066] Specifically, this embodiment provides a GNSS measurement terminal based on a MEMS wake-up mechanism, in which an RTC real-time clock circuit and a MEMS acceleration sensor jointly control a switch of a power control circuit through a microprocessor, and further controls the startup or shutdown of a GNSS module.

[0067] In the practical application of this embodiment, the microprocessor controls the closing or opening of the switch connected to the GNSS module in the power control circuit to start or shut down the GNSS module connected to the power control circuit according to the time recorded by the RTC real-time clock circuit and the vibration acceleration data collected by the MEMS acceleration sensor, specifically including:

[0068] The microprocessor determines whether the time recorded by the RTC real-time clock circuit reaches a preset time point.

[0069] If the time recorded by the RTC real-time clock circuit reaches the set time point, the microprocessor controls the closing of a switch in the power control circuit connected to the GNSS module to supply power to the GNSS module.

[0070] If the time recorded by the RTC real-time clock circuit has not reached the set time point, the microprocessor determines whether there is a motion over-limit signal at the location of the GNSS measurement terminal based on the vibration acceleration data collected by the MEMS acceleration sensor and a preset threshold value, and obtains a judgment result.

[0071] If the judgment result is that there is a motion over-limit signal at the location of the GNSS measurement terminal, the microprocessor controls the closing of a switch in the power control circuit connected to the GNSS module to supply power to the GNSS module.

[0072] In the actual application of this embodiment, the GNSS module is used to collect the deformation and displacement data of the geological disaster body after being connected to the power circuit when the switch connected to the GNSS module in the control power control circuit is closed, and upload the collected deformation and displacement data of the geological disaster body to the microprocessor.

[0073] Specifically, the microprocessor is also used to control the disconnection of the switch connected to the GNSS module in the power control circuit after receiving the deformation and displacement data of the geological disaster body collected by the GNSS module, thereby cutting off the power of the GNSS module.

[0074] In the specific application of this embodiment, if the time recorded by the RTC real-time clock circuit has not reached the set time point, the microprocessor determines whether there is a motion over-limit signal at the location of the GNSS measurement terminal based on the vibration acceleration data collected by the MEMS acceleration sensor and a preset threshold value, and obtains the judgment result; specifically including:

[0075] The microprocessor samples the vibration acceleration data collected by the MEMS acceleration sensor at a preset time interval to obtain sampled data of the vibration signal acceleration data.

[0076] The sampling data of the vibration signal acceleration data includes: 1 , x 2 , x 3 ...x i ...x N .

[0077] Among them, x i is the sampled i-th vibration signal acceleration data.

[0078] The microprocessor observes the sampled data of the acceleration data of the vibration signal using a time sliding window that slides in real time with time, and obtains the initial power of the abnormal vibration signal based on formula (1).

[0079] The formula (1) is:

[0080]

[0081] P p is the initial power of the abnormal vibration signal.

[0082] L is the width of the long time window in the time sliding window.

[0083] S is the width of the short time window in the time sliding window.

[0084]

[0085] x j is the jth vibration signal acceleration data sampled, where j=i+1-S.

[0086] It is the mean value of the acceleration data of the vibration signal in the short time window of the time sliding window.

[0087]

[0088] It is the mean value of the acceleration data of the vibration signal in the long time window in the time sliding window.

[0089] x k is the kth vibration signal acceleration data sampled, wherein k=i+1-L.

[0090] The microprocessor determines the initial power P of the abnormal vibration signal p Is it greater than a preset threshold? If the initial power P of the abnormal vibration signal is p If the initial power P of the abnormal vibration signal is greater than a preset threshold, it is determined that there is a motion over-limit signal at the location of the GNSS measurement terminal; p If the value is less than or equal to a preset threshold, it is determined that there is no motion over-limit signal at the location of the GNSS measurement terminal.

[0091] In a specific practical application, the width S of the short time window of the time sliding window is 0.2s.

[0092] The width L of the long time window of the time sliding window is 3s.

[0093] See also Figure 2 This embodiment also provides a GNSS measurement system based on a MEMS wake-up mechanism, characterized in that the system includes any of the above-mentioned GNSS measurement terminals based on a MEMS wake-up mechanism.

[0094] The system also includes: a communication circuit and a server.

[0095] The microprocessor in the GNSS measurement terminal based on the MEMS wake-up mechanism is connected to the server through the communication circuit.

[0096] In practical applications, the microprocessor in the GNSS measurement terminal based on the MEMS wake-up mechanism is also used to upload the data information uploaded by the GNSS module to the server platform through the communication circuit.

[0097] The power supply circuit includes a solar panel.

[0098] A GNSS measurement terminal and system based on a MEMS wake-up mechanism of the present invention adopts a MEMS acceleration sensor. The microprocessor can control the closing or opening of a switch connected to the GNSS module in the power control circuit according to the time recorded by the RTC real-time clock circuit and the vibration acceleration data collected by the MEMS acceleration sensor to start or shut down the GNSS module connected to the power control circuit, thereby extending the working time of the entire device, not missing key disaster and danger data, and effectively grasping the precious opportunity for geological disaster warning.

[0099] Experimental verification

[0100] Abnormal vibration signal simulation:

[0101]

[0102] Assume: A = 5 gal, f = 5 Hz, T 0 =12s; simulate abnormal vibration signals under three signal-to-noise ratios: 10dB, 7dB, and 4dB.

[0103] Assume that: short-term sliding window width S = 0.2s; long-term sliding window width L = 3s.

[0104] The long-short time window average energy ratio (STA / LTA) is a widely used abnormal signal feature extraction method. This embodiment uses the long-short time window average energy ratio (STA / LTA) method and the GNSS measurement terminal based on the MEMS wake-up mechanism in this implementation to extract the abnormal signal from the above-mentioned simulated abnormal vibration signal, wherein the specific settings are as shown in Table 1;

[0105] Table 1

[0106]

[0107] The simulation experiment results are shown in Table 2, which includes 30 tests in total.

[0108] Table 2

[0109]

[0110] It can be seen from Table 2 that under the three noise levels, STA / LTA has omissions and misjudgments, while the GNSS measurement terminal based on the MEMS wake-up mechanism in this embodiment has no omissions and misjudgments; and under the same noise level, the average deviation obtained by using the GNSS measurement terminal based on the MEMS wake-up mechanism in this embodiment is always smaller than STA / LTA. For example, when the SNR is 10dB, the average deviation of STA / LTA is 0.189s, while the average deviation obtained by using the GNSS measurement terminal based on the MEMS wake-up mechanism in this embodiment is only 0.069s, which proves that the GNSS measurement terminal based on the MEMS wake-up mechanism in this embodiment has good accuracy and robustness compared with STA / LTA.

[0111] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0112] The present invention is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present invention. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions.

[0113] It should be noted that in the claims, any reference numerals placed between brackets shall not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention may be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In the claims enumerating several means, several of these means may be embodied by the same hardware. The use of the words first, second, third, etc., is for convenience of expression only and does not indicate any order. These words may be understood as part of the component name.

[0114] In addition, it should be noted that, in the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0115] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments after knowing the basic creative concept. Therefore, the claims should be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0116] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention should also include these modifications and variations.

Claims

1. A GNSS measurement terminal based on a MEMS wake-up mechanism, characterized in that: include: Power supply circuit, power supply control circuit, microprocessor, MEMS acceleration sensor, RTC real-time clock circuit, GNSS module; The microprocessor is respectively connected to a MEMS acceleration sensor, an RTC real-time clock circuit for recording time, a power control circuit, and a GNSS module; The power control circuit is also connected to the GNSS module; The power supply circuit is connected to the microprocessor and the power supply control circuit respectively, and is used to supply power to the microprocessor and the power supply control circuit connected thereto; The MEMS acceleration sensor is used to collect vibration acceleration data at the location of the GNSS measurement terminal; A microprocessor, configured to control the closing or opening of a switch in the power control circuit connected to the GNSS module to start or shut down the GNSS module connected to the power control circuit according to the time recorded by the RTC real-time clock circuit and the vibration acceleration data collected by the MEMS acceleration sensor; The microprocessor controls the closing or opening of a switch connected to the GNSS module in the power control circuit to start or shut down the GNSS module connected to the power control circuit according to the time recorded by the RTC real-time clock circuit and the vibration acceleration data collected by the MEMS acceleration sensor, specifically including: The microprocessor determines whether the time recorded by the RTC real-time clock circuit reaches a preset time point; If the time recorded by the RTC real-time clock circuit reaches the set time point, the microprocessor controls the closing of a switch in the power control circuit connected to the GNSS module to supply power to the GNSS module; If the time recorded by the RTC real-time clock circuit has not reached the set time point, the microprocessor determines whether there is a motion over-limit signal at the location of the GNSS measurement terminal based on the vibration acceleration data collected by the MEMS acceleration sensor and a preset threshold value, and obtains a judgment result; If the judgment result is that there is a motion over-limit signal at the location of the GNSS measurement terminal, the microprocessor controls the closing of a switch in the power control circuit connected to the GNSS module to supply power to the GNSS module; The GNSS module is used to collect deformation and displacement data of the geological disaster body after being connected to the power circuit when the switch connected to the GNSS module in the control power control circuit is closed, and upload the collected deformation and displacement data of the geological disaster body to the microprocessor; The microprocessor is further used to control the disconnection of a switch connected to the GNSS module in the power control circuit after receiving the deformation and displacement data of the geological disaster body collected by the GNSS module, thereby powering off the GNSS module; If the time recorded by the RTC real-time clock circuit has not reached the set time point, the microprocessor determines whether there is a motion over-limit signal at the location of the GNSS measurement terminal based on the vibration acceleration data collected by the MEMS acceleration sensor and a preset threshold value, and obtains a judgment result; specifically including: The microprocessor samples the vibration acceleration data collected by the MEMS acceleration sensor at a preset time interval to obtain sampled data of the vibration signal acceleration data; The sampling data of the vibration signal acceleration data includes: x1, x2, x3...x i ...x N ; Among them, x i is the acceleration data of the i-th vibration signal sampled; The microprocessor observes the sampled data of the acceleration data of the vibration signal using a time sliding window that slides in real time with time, and obtains the initial power of the abnormal vibration signal based on formula (1); The formula (1) is: P p is the initial power of abnormal vibration signal; L is the width of the long time window in the time sliding window; S is the width of the short time window in the time sliding window; x j is the jth vibration signal acceleration data sampled; where j=i+1-S; It is the mean value of the acceleration data of the vibration signal in the short time window of the time sliding window; It is the mean value of the acceleration data of the vibration signal in the long time window in the time sliding window; x k is the kth vibration signal acceleration data sampled; where k=i+1-L; The microprocessor determines the initial power P of the abnormal vibration signal p Is it greater than a preset threshold? If the initial power P of the abnormal vibration signal is p If the initial power P of the abnormal vibration signal is greater than a preset threshold, it is determined that there is a motion over-limit signal at the location of the GNSS measurement terminal; p If the value is less than or equal to a preset threshold, it is determined that there is no motion over-limit signal at the location of the GNSS measurement terminal.

2. The GNSS measurement terminal based on the MEMS wake-up mechanism according to claim 1, characterized in that: The width S of the short time window of the time sliding window is 0.2s.

3. The GNSS measurement terminal based on the MEMS wake-up mechanism according to claim 2, characterized in that: The width L of the long time window of the time sliding window is 3s.

4. A GNSS measurement system based on a MEMS wake-up mechanism, characterized in that: The system comprises a GNSS measurement terminal based on a MEMS wake-up mechanism as described in any one of claims 1 to 3 above; The system also includes: a communication circuit and a server; The microprocessor in the GNSS measurement terminal based on the MEMS wake-up mechanism is connected to the server through the communication circuit.

5. The system according to claim 4, characterized in that The microprocessor in the GNSS measurement terminal based on the MEMS wake-up mechanism is also used to upload the data information uploaded by the GNSS module to the server platform through the communication circuit.

6. The system according to claim 5, characterized in that The power supply circuit includes a solar panel.

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