Low-cost Area Monitoring System Based on Terahertz Millimeter-wave Radar

Abstract

The present invention provides a low-cost area monitoring system based on a terahertz millimeter-wave radar, comprising: a signal transmitting unit that transmits a terahertz millimeter-wave frequency-modulated signal to a monitoring area and transmits the signal information of the transmitted signal to a central control unit; a signal reflecting unit on the monitoring area that reflects the terahertz millimeter-wave frequency-modulated signal; a signal receiving unit that receives the terahertz millimeter-wave frequency-modulated signal reflected by the signal reflecting unit, obtains a frequency-modulated signal echo signal, and transmits the obtained signal information to the central control unit; the central control unit analyzes the signal information of the terahertz millimeter-wave frequency-modulated signal and the signal information of the frequency-modulated signal echo signal to obtain monitoring information, and a monitoring and analysis unit determines the monitoring result of the monitoring area according to the monitoring information. The present invention performs periodic scanning on the monitoring area through terahertz millimeter waves, which is not only less affected by the climate, has a large monitoring range, but also has high resolution, thereby improving the accuracy of area monitoring.

Description

Technical Field

[0001] The present invention relates to the field of monitoring technologies, and particularly relates to a low-cost area monitoring system based on a terahertz millimeter-wave radar. Background Art

[0002] In current area monitoring systems, devices such as wire-pulling displacement gauges or accelerometers are usually used, or lidar, or radars with shorter wavelengths are used. However, using devices such as wire-pulling displacement gauges or accelerometers can often only monitor single points, it is difficult to arrange monitoring points, requires personnel to work in dangerous areas for a long time, and it is difficult to solve the power supply and communication of the monitoring devices. Once a landslide occurs, the devices will be damaged along with the landslide; using lidar is greatly affected by the climate and cannot complete measurements in rainy, snowy, or foggy weather; using radars with shorter wavelengths has insufficient resolution and low accuracy. Therefore, the present invention proposes a low-cost area monitoring system based on a terahertz millimeter-wave radar, which periodically scans the monitoring area through terahertz millimeter waves, not only has little influence from the climate, a large monitoring range, but also has high resolution and high accuracy. Summary of the Invention

[0003] The purpose of the present invention is to provide a low-cost area monitoring system based on a terahertz millimeter-wave radar to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A low-cost area monitoring system based on a terahertz millimeter-wave radar, comprising: a terahertz millimeter-wave radar, a signal reflection unit, a central control unit, and a monitoring and analysis unit, wherein the terahertz millimeter-wave radar comprises: a signal transmitting unit and a signal receiving unit;

[0005] The signal transmitting unit is used for transmitting a terahertz millimeter-wave frequency-modulated signal to the monitoring area and transmitting the signal information of the terahertz millimeter-wave frequency-modulated signal to the central control unit; the signal reflection unit is on the monitoring area and is used for reflecting the terahertz millimeter-wave frequency-modulated signal; the signal receiving unit is used for receiving the terahertz millimeter-wave frequency-modulated signal reflected by the signal reflection unit, obtaining a frequency-modulated signal echo signal, and transmitting the signal information of the frequency-modulated signal echo signal to the central control unit; the central control unit is used for analyzing the signal information of the terahertz millimeter-wave frequency-modulated signal and the signal information of the frequency-modulated signal echo signal to obtain monitoring information, and transmitting the monitoring information to the monitoring and analysis unit; the monitoring and analysis unit is used for determining the monitoring result of the monitoring area according to the monitoring information.

[0006] Further, the reflection unit includes a plurality of targets, the targets are distributed on the monitoring surface area, and targets are provided on the edge area of the monitoring surface area, and the targets are randomly placed in the central area of the monitoring surface area.

[0007] Further, the target is a corner reflector, the corner reflector is an open-ended cone formed by three isosceles right triangles, the interior of the isosceles right triangle is polished, and the opening direction of the open-ended cone is aligned with the terahertz millimeter-wave radar.

[0008] Further, the central control unit also controls the signal transmitting unit to transmit a terahertz millimeter-wave frequency-modulated signal. When the control center controls the signal transmitting unit to transmit a terahertz millimeter-wave frequency-modulated signal, it obtains the relative position between the target in the signal transmitting unit and the terahertz millimeter-wave radar, and controls the signal transmitting unit to transmit a periodic terahertz millimeter-wave frequency-modulated signal according to the relative position between the target in the signal transmitting unit and the terahertz millimeter-wave radar.

[0009] Further, the terahertz millimeter-wave radar is placed on a stabilizing device, the stabilizing device includes: a base, a horizontal mounting seat, a horizontal rotating table, a pitch control machine, and a radar mounting seat. The base is connected to the horizontal mounting seat, the radar mounting seat is connected to the horizontal mounting seat, the horizontal rotating table is also connected to the horizontal mounting seat, the pitch control machine is connected to the end point of the radar mounting seat, and both the pitch control machine and the horizontal rotating table are connected to the central control unit, and the central control unit controls the pitch control machine to adjust the pitch angle of the terahertz millimeter-wave radar, and controls the horizontal rotating table through the central control unit to adjust the horizontal viewing angle of the terahertz millimeter-wave radar.

[0010] Further, when the central control unit analyzes according to the signal information of the terahertz millimeter-wave frequency-modulated signal and the signal information of the frequency-modulated signal echo signal, it analyzes according to the target, and analyzes the signal information of the terahertz millimeter-wave frequency-modulated signal transmitted to the target and the signal information of the wave frequency-modulated signal echo signal reflected by the same target to determine the distance from the target to the terahertz millimeter-wave radar, so as to obtain the monitoring information of multiple targets.

[0011] Further, when the central control unit transmits the monitoring information to the monitoring and analysis unit, it transmits the monitoring information of multiple targets obtained, and uses multi-link transmission during transmission, including: detecting the transmission link to determine whether the transmission link is normal; selecting a target number of main transmission links from the normal transmission links, and determining a transmission scheme for the monitoring information according to the main transmission links; transmitting the monitoring information to the monitoring and analysis unit through multiple transmission links according to the transmission protocol according to the transmission scheme, monitoring the multiple transmission links during the transmission process, and retransmitting the data transmitted through the abnormal link through the non-main transmission links in the normal transmission links when a transmission link anomaly occurs.

[0012] Further, the low-cost area monitoring system further includes an environmental survey unit, which is connected to the central control unit and is used to obtain environmental factor information and transmit the environmental factor information to the central control unit. When the central control unit analyzes according to the signal information of the terahertz millimeter wave frequency modulation signal and the signal information of the frequency modulation signal echo signal, it combines the influence of the environmental factor information on signal transmission to obtain monitoring information.

[0013] Further, when the monitoring and analysis unit determines the monitoring result of the monitoring area according to the monitoring information, it includes:

[0014] Receiving the monitoring information of multiple targets transmitted by the central control unit;

[0015] Sorting out the monitoring information of the multiple targets according to the targets to obtain a monitoring information set for each target;

[0016] In the monitoring information set of the target, arranging the monitoring information of the target in chronological order, and comparing the latest saved monitoring information in the monitoring information set of the target with the historical monitoring information to obtain the monitoring analysis information of the target;

[0017] Determining the monitoring analysis result of the target according to the monitoring analysis information of the target. When the monitoring analysis information of the target does not exceed the preset threshold range, the monitoring analysis result of the target is that the target has not changed. When the monitoring analysis information of the target exceeds the preset threshold range, the monitoring analysis result of the target is that the target has changed;

[0018] For the monitoring analysis result of the target, when the monitoring analysis results of all targets are that the targets have not changed, the monitoring result of the monitoring area is that no landslide phenomenon has occurred. Otherwise, the monitoring result of the monitoring area is that a landslide phenomenon has occurred.

[0019] Further, when the monitoring and analysis result of the target shows that the target has not changed, information prediction is still performed on the target, and the information prediction includes:

[0020] In the monitoring information set of the target, after arranging the monitoring information of the target in chronological order, the gradient information of the monitoring information of the target at two adjacent times is obtained;

[0021] Fitting is performed on the gradient information to obtain the monitoring information gradient change curve of the target;

[0022] Predicting according to the monitoring information gradient change curve of the target to obtain the predicted gradient information of the target. If the predicted gradient information of the target does not exceed the preset threshold range, the predicted monitoring and analysis result of the target is that the target has not changed. When the predicted gradient information of the target exceeds the preset threshold range, the predicted monitoring and analysis result of the target is that the target has changed, and when the predicted monitoring and analysis result of the target is that the target has changed, a danger warning prompt is given for the target.

[0023] Other features and advantages of the present invention will be described in the following specification, and part of them will become obvious from the specification or be understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained by the structures specifically pointed out in the written specification, claims, and drawings.

[0024] The technical solution of the present invention will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0025] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0026] Figure 1 is a schematic diagram of a low-cost area monitoring system based on a terahertz millimeter-wave radar according to the present invention;

[0027] Figure 2 is a schematic diagram of the stabilizing device in the present invention;

[0028] Figure 3 is another schematic diagram of a low-cost area monitoring system based on a terahertz millimeter-wave radar according to the present invention. Detailed Embodiments

[0029] The following describes the preferred embodiments of the present invention with reference to the drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0030] As Figure 1 shown, an embodiment of the present invention provides a low-cost area monitoring system based on a terahertz millimeter-wave radar, including: a terahertz millimeter-wave radar, a signal reflection unit, a central control unit, and a monitoring and analysis unit, wherein the terahertz millimeter-wave radar includes: a signal transmitting unit and a signal receiving unit;

[0031] The signal transmitting unit is configured to transmit a terahertz millimeter-wave frequency-modulated signal to the monitoring area and transmit the signal information of the terahertz millimeter-wave frequency-modulated signal to the central control unit; the signal reflection unit is on the monitoring area and is configured to reflect the terahertz millimeter-wave frequency-modulated signal; the signal receiving unit is configured to receive the terahertz millimeter-wave frequency-modulated signal reflected by the signal reflection unit, obtain a frequency-modulated signal echo signal, and transmit the signal information of the frequency-modulated signal echo signal to the central control unit; the central control unit is configured to analyze the signal information of the terahertz millimeter-wave frequency-modulated signal and the signal information of the frequency-modulated signal echo signal to obtain monitoring information, and transmit the monitoring information to the monitoring and analysis unit; the monitoring and analysis unit is configured to determine the monitoring result of the monitoring area according to the monitoring information.

[0032] The low-cost area monitoring system based on a terahertz millimeter-wave radar provided by the above technical solution includes: a terahertz millimeter-wave radar, a signal reflection unit, a central control unit, and a monitoring and analysis unit, wherein the terahertz millimeter-wave radar includes: a signal transmitting unit and a signal receiving unit; both the signal transmitting unit and the signal receiving unit are connected to the central control unit, and the central control unit is further connected to the monitoring and analysis unit. When monitoring an area, the signal transmitting unit of the terahertz millimeter-wave radar is controlled to transmit a terahertz millimeter-wave frequency-modulated signal to the monitoring area. The terahertz millimeter-wave frequency-modulated signal is transmitted to the monitoring panel, and the signal reflection unit on the monitoring panel refracts the terahertz millimeter-wave frequency-modulated signal back. Then, the signal receiving unit receives the terahertz millimeter-wave frequency-modulated signal reflected by the signal reflection unit to obtain a frequency-modulated signal echo signal. At the same time, the signal transmitting unit transmits the signal information of the terahertz millimeter-wave frequency-modulated signal to the central control unit, and the signal receiving unit transmits the signal information of the frequency-modulated signal echo signal to the central control unit. Then, the central control unit analyzes the signal information of the terahertz millimeter-wave frequency-modulated signal and the signal information of the frequency-modulated signal echo signal to determine the distance from the monitoring area to the terahertz millimeter-wave radar, thereby obtaining monitoring information, and transmitting the monitoring information to the monitoring and analysis unit. Finally, the monitoring and analysis unit analyzes according to the monitoring information, and determines that the monitoring area has a landslide when the monitoring information changes, otherwise there is no abnormality in the monitoring area.

[0033] The above technical solution performs periodic scanning on the monitoring area through terahertz millimeter waves. It is not only less affected by the climate and can still transmit terahertz millimeter frequency modulation signals and frequency modulation signal echo signals in rainy, snowy, and foggy weather, enabling the acquisition of monitoring information for the monitoring area and ensuring the determination of monitoring results. Moreover, using a terahertz millimeter radar for signal transmission and reception not only has a large monitoring range but also is easy to control and adjust the terahertz millimeter frequency modulation signal. In addition, the terahertz millimeter frequency modulation signal has high resolution and high accuracy, which can effectively improve the accuracy of area monitoring and timely detect landslides in the monitored area.

[0034] In an embodiment provided by the present invention, the reflection unit includes a plurality of target markers, the target markers are distributed on the monitoring area, and target markers are provided on the edge area of the monitoring area, and target markers are randomly placed in the central area of the monitoring area.

[0035] The reflection unit in the above technical solution includes a plurality of target markers, and each target marker is distributed on the monitoring area. When placing the target markers on the monitoring area, some target markers are placed on the edge area of the monitoring area, and target markers are randomly placed in the central area of the monitoring area.

[0036] The above technical solution can monitor the monitoring area through multiple monitoring points by setting a plurality of target markers in the signal reflection unit, thereby enabling comprehensive monitoring of the monitoring area. Moreover, by placing some target markers on the edge area of the monitoring area, it is possible to monitor the areas where landslides are likely to occur in the monitoring area, so as to timely detect landslide phenomena in the monitoring area, and further improve the comprehensiveness and accuracy of area monitoring.

[0037] In an embodiment provided by the present invention, the target marker is a corner reflector, and the corner reflector is an open cone formed by three isosceles right triangles. The interior of the isosceles right triangle is polished, and the opening direction of the open cone is aligned with the terahertz millimeter radar.

[0038] The target marker in the above technical solution is a corner reflector. Among them, the corner reflector is an open cone formed by three isosceles right triangles with polished inner walls. For example, an isosceles right triangle with a height of 25 cm is used for welding to form a cone, and the resulting cone is open. When placing the corner reflector, the opening direction of the cone is aligned with the terahertz millimeter radar, and when placing the target marker, it can be placed manually or by operating instrument equipment to place the target marker in position.

[0039] The above technical solution can reflect the terahertz millimeter-wave frequency-modulated signal through the corner reflector, causing the terahertz millimeter-wave frequency-modulated signal to refract and amplify on the corner reflector, generating a very strong echo signal. Moreover, the corner reflector is composed of three isosceles right triangles to form an open cone, which can be directly placed on the monitoring panel without finding out how to place the corner reflector. As long as the open direction of the corner reflector is aligned with the terahertz millimeter-wave radar, the time consumed for placing the corner reflector can be reduced. In addition, when placing the target, the position of the target can also be placed by operating the instrument and equipment, which can reduce the manual workload and avoid landslides in the monitored area during manual placement, causing harm to the staff, thereby improving safety protection.

[0040] In an embodiment provided by the present invention, the central control unit also controls the signal transmitting unit to transmit the terahertz millimeter-wave frequency-modulated signal. When the control center controls the signal transmitting unit to transmit the terahertz millimeter-wave frequency-modulated signal, it acquires the relative position between the target in the signal transmitting unit and the terahertz millimeter-wave radar, and controls the signal transmitting unit to transmit the periodic terahertz millimeter-wave frequency-modulated signal according to the relative position between the target in the signal transmitting unit and the terahertz millimeter-wave radar.

[0041] The central control unit of the above technical solution also controls the transmission of the terahertz millimeter-wave frequency-modulated signal by the signal transmitting unit. The parameters of the terahertz millimeter-wave frequency-modulated signal transmitted by the signal transmitting unit can be adjusted through the control center, or the direction of the terahertz millimeter-wave frequency-modulated signal transmitted to the signal reflecting unit can be adjusted. When adjusting the direction of the terahertz millimeter-wave frequency-modulated signal transmitted to the signal reflecting unit, the central control unit first acquires the relative position between the target in the signal reflecting unit and the terahertz millimeter-wave radar, clarifies the relative azimuth information of the target relative to the terahertz millimeter-wave radar, and then controls the signal transmitting unit to transmit the periodic terahertz millimeter-wave frequency-modulated signal according to the relative azimuth information of the target relative to the terahertz millimeter-wave radar.

[0042] The above technical solution can control the signal transmitting unit to transmit the periodic terahertz millimeter-wave frequency-modulated signal according to the relative azimuth information of the target relative to the terahertz millimeter-wave radar, enabling the signal transmitting unit to accurately transmit the terahertz millimeter-wave frequency-modulated signal for each target when transmitting the terahertz millimeter-wave frequency-modulated signal, avoiding ineffective monitoring of the terahertz millimeter-wave frequency-modulated signal, not only improving the effectiveness of monitoring, but also reducing cost waste. In addition, by controlling the signal transmitting unit to transmit the periodic terahertz millimeter-wave frequency-modulated signal, the periodic monitoring information of the monitored area can be obtained, thereby realizing the real-time monitoring of the monitored area, and then being able to promptly detect abnormal phenomena in the monitored area.

[0043] Such as Figure 2As shown, in an embodiment provided by the present invention, the terahertz millimeter-wave radar is placed on a stabilizing device, and the stabilizing device includes: a base, a horizontal mounting base, a horizontal rotating table, a pitching control machine, and a radar mounting base. The base is connected to the horizontal mounting base, the radar mounting base is connected to the horizontal mounting base, the horizontal rotating table is also connected to the horizontal mounting base, the pitching control machine is connected to the end point of the radar mounting base, and both the pitching control machine and the horizontal rotating table are connected to the central control unit. The central control unit controls the pitching control machine to adjust the pitching angle of the terahertz millimeter-wave radar, and controls the horizontal rotating table through the central control unit to adjust the horizontal viewing angle of the terahertz millimeter-wave radar.

[0044] In the above technical solution, the terahertz millimeter-wave radar is placed on a stabilizing device during use. The stabilizing device includes: a base, a horizontal mounting base, a horizontal rotating table, a pitching control machine, and a radar mounting base. Among them, the horizontal mounting base is connected to the radar mounting base, and a pitching control machine is installed at one end point of the connection between the horizontal mounting base and the radar mounting base. The pitching control machine can control the connecting components according to the control information so that the radar mounting base can pitch at different angles. Moreover, the bottom of the horizontal mounting base is connected to the base, and the horizontal mounting base is also connected to a horizontal rotating table. The horizontal selection table can control the horizontal mounting base to rotate horizontally at different angles according to the control information. In addition, both the pitching control machine and the horizontal rotating table are connected to the central control unit, and the central control unit controls the pitching control machine and the horizontal rotating table. During use, the terahertz millimeter-wave radar is fixed to the radar mounting base, and the central control unit enables the transmitting unit in the terahertz millimeter-wave radar to emit terahertz millimeter-wave frequency-modulated signals in different directions and angles by controlling the pitching control machine and the horizontal rotating table.

[0045] The above technical solution can keep the terahertz millimeter-wave radar stable through the base, avoiding the situation that the terahertz millimeter-wave radar cannot stably emit terahertz millimeter-wave frequency-modulated signals, and also avoiding damage to the terahertz millimeter-wave radar caused by falling during use. Through the pitching control machine and the horizontal rotating table, the terahertz millimeter-wave radar can adjust the angle in the horizontal and vertical directions when emitting terahertz millimeter-wave detection signals, thereby expanding the monitoring range and enabling the monitoring of a larger monitoring area. In addition, since both the pitching control machine and the horizontal rotating table are connected to the central control unit, when adjusting the angle in the horizontal and vertical directions, there is no need for manual operation by the staff, saving manpower consumption and having high adjustment accuracy.

[0046] In an embodiment provided by the present invention, when analyzing according to the signal information of the terahertz millimeter-wave frequency-modulated signal and the signal information of the frequency-modulated signal echo signal, the central control unit performs analysis according to the target, analyzes the signal information of the terahertz millimeter-wave frequency-modulated signal transmitted to the target and the signal information of the frequency-modulated signal echo signal reflected by the same target to determine the distance from the target to the terahertz millimeter-wave radar, so as to obtain the monitoring information of multiple targets.

[0047] In the above technical solution, in the central control unit, when analyzing according to the signal information of the terahertz millimeter-wave frequency-modulated signal and the signal information of the frequency-modulated signal echo signal, the analysis is performed according to the target. For the same target, the signal information of the terahertz millimeter-wave frequency-modulated signal transmitted to the target and the signal information of the frequency-modulated signal echo signal reflected by the same target are analyzed to determine the distance from the target to the terahertz millimeter-wave radar, so as to obtain the monitoring information of the target. Moreover, the signal transmitting unit transmits the signal information of the terahertz millimeter-wave frequency-modulated signal to the central control unit in real time, and the signal receiving unit also transmits the signal information of the received frequency-modulated signal echo signal to the central control unit in real time. Then, the central control unit analyzes in real time according to the signal information of the terahertz millimeter-wave frequency-modulated signal and the signal information of the frequency-modulated signal echo signal transmitted in real time by the signal transmitting unit and the signal receiving unit to determine the distance from the target to the terahertz millimeter-wave radar, and further obtains the monitoring information of multiple targets.

[0048] The above technical solution enables the central control unit to perform real-time analysis on the signal information of the terahertz millimeter-wave frequency-modulated signal and the signal information of the frequency-modulated signal echo signal by transmitting the signal information of the terahertz millimeter-wave frequency-modulated signal to the central control unit in real time through the signal transmitting unit and transmitting the signal information of the received frequency-modulated signal echo signal to the central control unit in real time by the signal receiving unit, avoiding the cross of signal information between different targets during the analysis by the central control unit, resulting in the phenomenon of signal information chaos, thus avoiding errors in the central control unit and improving the accuracy of the monitoring information.

[0049] In an embodiment provided by the present invention, when the central control unit transmits the monitoring information to the monitoring and analysis unit, it transmits the monitoring information of multiple targets obtained, and uses multi-link transmission during transmission, including: detecting the transmission link to determine whether the transmission link is normal; selecting a target number of main transmission links from the normal transmission links, and determining a transmission scheme for the monitoring information according to the main transmission links; transmitting the monitoring information to the monitoring and analysis unit through multiple transmission links according to the transmission protocol according to the transmission scheme, monitoring the multiple transmission links during the transmission process, and retransmitting the data transmitted by the abnormal link through the non-main transmission links in the normal transmission links when a transmission link abnormality occurs.

[0050] In the above technical solution, when the central control unit transmits the monitoring information to the monitoring and analysis unit, it transmits the monitoring information of multiple targets obtained, and uses multi-link transmission during transmission, including: detecting the transmission link to determine whether the transmission link is normal; selecting a target number of main transmission links from the normal transmission links, and determining a transmission scheme for the monitoring information according to the main transmission links; transmitting the monitoring information to the monitoring and analysis unit through multiple transmission links according to the transmission protocol according to the transmission scheme, monitoring the multiple transmission links during the transmission process, and retransmitting the data transmitted by the abnormal link through the non-main transmission links in the normal transmission links when a transmission link abnormality occurs.

[0051] In the above technical solution, by using multi-links, not only can the monitoring information of multiple targets be transmitted quickly, avoiding the retention caused by untimely transmission of the monitoring information of multiple targets, thereby avoiding information chaos, and further improving the accuracy of the transmitted monitoring information, but also the multi-links are monitored, and abnormal transmission links can be found in time so that they can be replaced in time to avoid affecting the transmission of monitoring information, and further ensure the normal progress of the transmission of monitoring information.

[0052] As Figure 3 shown, in an embodiment provided by the present invention, the low-cost area monitoring system further includes an environmental survey unit, the environmental survey unit is connected to the central control unit, and is used to obtain environmental factor information and transmit the environmental factor information to the central control unit. When the central control unit analyzes according to the signal information of the terahertz millimeter wave frequency modulation signal and the signal information of the frequency modulation signal echo signal, it combines the influence of the environmental factor information on signal transmission to obtain monitoring information.

[0053] In the above technical solution, the low-cost area monitoring system is also provided with an environmental survey unit. The environmental survey unit is connected to the central control unit and is used to obtain environmental factor information and transmit the environmental factor information to the central control unit. When the central control unit analyzes according to the signal information of the terahertz millimeter wave frequency modulation signal and the signal information of the frequency modulation signal echo signal, it combines the influence of the environmental factor information on the signal transmission to obtain the monitoring information.

[0054] Through the environmental survey unit in the above technical solution, the influence of environmental factors on the terahertz millimeter wave frequency modulation signal during the monitoring of the monitoring area by the low-cost area monitoring system can be obtained, thereby improving the accuracy of the central control unit in the analysis process according to the signal information of the terahertz millimeter wave frequency modulation signal and the signal information of the frequency modulation signal echo signal, and further improving the accuracy of the monitoring of the monitoring area.

[0055] In an embodiment provided by the present invention, when the monitoring and analysis unit determines the monitoring result of the monitoring area according to the monitoring information, it includes:

[0056] Receiving the monitoring information of multiple targets transmitted by the central control unit;

[0057] Sorting the monitoring information of the multiple targets according to the targets to obtain the monitoring information set of each target;

[0058] In the monitoring information set of the target, arranging the monitoring information of the target in chronological order, and comparing the latest saved monitoring information in the monitoring information set of the target with the historical monitoring information to obtain the monitoring analysis information of the target;

[0059] Determining the monitoring analysis result of the target according to the monitoring analysis information of the target. When the monitoring analysis information of the target does not exceed the preset threshold range, the monitoring analysis result of the target is that the target has not changed. When the monitoring analysis information of the target exceeds the preset threshold range, the monitoring analysis result of the target is that the target has changed;

[0060] For the monitoring analysis result of the target, when the monitoring analysis results of all targets are that the targets have not changed, the monitoring result of the monitoring area is that no landslide phenomenon has occurred. Otherwise, the monitoring result of the monitoring area is that a landslide phenomenon has occurred.

[0061] When the monitoring and analysis unit of the above technical solution determines the monitoring result of the monitored area based on the monitoring information, first, it receives the monitoring information of multiple targets transmitted by the central control unit; then, it sorts out the monitoring information of multiple targets according to the targets to obtain the monitoring information set of each target; next, in the monitoring information set of the target, it arranges the monitoring information of the target in chronological order, and compares the latest saved monitoring information in the monitoring information set of the target with the historical monitoring information to obtain the monitoring and analysis information of the target; then, it determines the monitoring and analysis result of the target according to the monitoring and analysis information of the target. When the monitoring and analysis information of the target does not exceed the preset threshold range, the monitoring and analysis result of the target is that the target has not changed. When the monitoring and analysis information of the target exceeds the preset threshold range, the monitoring and analysis result of the target is that the target has changed; finally, for the monitoring and analysis result of the target, when the monitoring and analysis results of all targets are that the target has not changed, the monitoring result of the monitored area is that no landslide phenomenon has occurred. Otherwise, the monitoring result of the monitored area is that a landslide phenomenon has occurred.

[0062] Among them, when obtaining the monitoring and analysis information of the target, the following formula is used for calculation:

[0063]

[0064] In the above formula, α i is the monitoring and analysis data value of the i-th target, d i,k represents the monitoring information of the i-th target at time k, d i,j represents the monitoring information of the i-th target at time j, n k represents the number of monitoring information in the monitoring information set of the i-th target at time k;

[0065] Then, the monitoring result FR of the monitored area is determined by the following formula;

[0066]

[0067] In the above formula, a is the preset threshold, and the value is a non-negative number; else represents the situation other than ∑ i (α i -a) ≤ 0.

[0068] Through organizing the monitoring information of multiple targets according to the targets, the above technical solution can enable each target in the monitoring and analysis unit to have its own monitoring information set, so that the monitoring information set corresponding to the target can be accurately found in the monitoring and analysis unit for monitoring information caching and monitoring result determination, thereby quickly obtaining the monitoring and analysis result of the target, improving the determination efficiency of the monitoring result of the monitoring area. Moreover, arranging the monitoring information of the target in chronological order facilitates obtaining the monitoring information of the previous moment when obtaining the monitoring and analysis information of the target. In addition, when obtaining the monitoring and analysis information of the target, by calculating the monitoring and analysis data value of the i-th target, comprehensively considering the monitoring information in the monitoring information set of the target, avoiding large differences between the current monitoring information and the initial monitoring information caused by the monitoring information within the allowable difference range at adjacent moments and not being discovered, thereby improving the credibility of the monitoring and analysis information of the target and the accuracy of monitoring the monitoring area.

[0069] In an embodiment provided by the present invention, when the monitoring and analysis result of the target indicates that the target has not changed, information prediction is still performed on the target, and the information prediction includes:

[0070] In the monitoring information set of the target, after arranging the monitoring information of the target in chronological order, obtaining the gradient information of the monitoring information of the target at two adjacent times;

[0071] Fitting the gradient information to obtain the gradient change curve of the monitoring information of the target;

[0072] Predicting according to the gradient change curve of the monitoring information of the target to obtain the predicted gradient information of the target. When the predicted gradient information of the target does not exceed the preset threshold range, the predicted monitoring and analysis result of the target is that the target has not changed. When the predicted gradient information of the target exceeds the preset threshold range, the predicted monitoring and analysis result of the target is that the target has changed. Moreover, when the predicted monitoring and analysis result of the target is that the target has changed, a danger warning prompt is given for the target.

[0073] When the monitoring and analysis result of the target shows that the target has not changed, information prediction is still carried out for the target. The process of information prediction includes: First, in the monitoring information set of the target, the monitoring information of the target is arranged in chronological order, and the gradient information of the monitoring information of the target at two adjacent times is obtained; Then, fitting is performed on the gradient information to obtain the gradient change curve of the monitoring information of the target; Next, prediction is carried out according to the gradient change curve of the monitoring information of the target to obtain the predicted gradient information of the target; If the predicted gradient information of the target does not exceed the preset threshold range, the predicted monitoring and analysis result of the target is that the target has not changed. When the predicted gradient information of the target exceeds the preset threshold range, the predicted monitoring and analysis result of the target is that the target has changed; When the predicted monitoring and analysis result of the target is that the target has changed, a danger warning prompt is given for the target.

[0074] Through fitting the gradient information, the above technical solution can obtain the gradient change trend between the monitoring information of the target, so as to predict the next monitoring information from the gradient change trend. Moreover, when fitting, it is based on all the monitoring information of the target, which can improve the fitting effect and the accuracy of the predicted gradient information. In addition, when the predicted monitoring and analysis result of the target is that the target has changed, a danger warning prompt for the target can timely remind the staff that there is a danger of landslide in the monitoring area, enabling the staff to form a sense of danger and avoid casualties caused by the landslide in the area, thus improving the safety guarantee.

[0075] Those skilled in the art should understand that the first and second in the present invention only refer to different application stages.

[0076] After considering the specification and practicing the disclosure herein, those skilled in the art will readily conceive of other embodiments of the present disclosure. This application is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include known common knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the following claims.

[0077] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A low-cost area monitoring system based on terahertz millimeter-wave radar, characterized in that, The low-cost area monitoring system includes: a terahertz millimeter-wave radar, a signal reflection unit, a central control unit, and a monitoring and analysis unit. The terahertz millimeter-wave radar includes: a signal transmitting unit and a signal receiving unit; The signal transmitting unit is configured to transmit a terahertz millimeter-wave frequency-modulated signal to the monitoring area and transmit the signal information of the terahertz millimeter-wave frequency-modulated signal to the central control unit; the signal reflection unit is on the monitoring area and is configured to reflect the terahertz millimeter-wave frequency-modulated signal; the signal receiving unit is configured to receive the terahertz millimeter-wave frequency-modulated signal reflected by the signal reflection unit, obtain a frequency-modulated signal echo signal, and transmit the signal information of the frequency-modulated signal echo signal to the central control unit; the central control unit is configured to analyze the signal information of the terahertz millimeter-wave frequency-modulated signal and the signal information of the frequency-modulated signal echo signal to obtain monitoring information, and transmit the monitoring information to the monitoring and analysis unit; the monitoring and analysis unit is configured to determine the monitoring result of the monitoring area according to the monitoring information; Wherein, the reflection unit includes a plurality of targets, the targets are distributed on the monitoring area, and targets are provided on the edge area of the monitoring area, and the targets are randomly placed in the central area of the monitoring area; the target is a corner reflector, and the corner reflector is an open cone formed by three isosceles right triangles. The interior of the isosceles right triangle is polished, and the opening direction of the open cone is aligned with the terahertz millimeter-wave radar; When the monitoring and analysis unit determines the monitoring result of the monitoring area according to the monitoring information, it includes: Receiving the monitoring information of a plurality of targets transmitted by the central control unit; Sorting the monitoring information of the plurality of targets according to the targets to obtain a monitoring information set for each target; In the monitoring information set of the target, arranging the monitoring information of the target in chronological order, comparing the latest saved monitoring information in the monitoring information set of the target with the historical monitoring information, and calculating the monitoring analysis data value through the following formula to obtain the monitoring analysis information of the target; In the above formula, α i is the monitoring and analysis data value of the i-th target, and d i,k represents the monitoring information of the i-th target at time k, and d i,j represents the monitoring information of the i-th target at time j. n k represents the number of monitoring information in the monitoring information set of the i-th target at time k; Determining the monitoring analysis result of the target according to the monitoring analysis information of the target. When the monitoring analysis information of the target does not exceed the preset threshold range, the monitoring analysis result of the target is that the target has not changed. When the monitoring analysis information of the target exceeds the preset threshold range, the monitoring analysis result of the target is that the target has changed; For the monitoring analysis result of the target, when the monitoring analysis results of all targets are that the targets have not changed, the monitoring result of the monitoring area is that no landslide phenomenon has occurred. Otherwise, the monitoring result of the monitoring area is that a landslide phenomenon has occurred.

2. The low-cost area monitoring system according to claim 1, characterized in that, The central control unit also controls the signal transmitting unit to transmit a terahertz millimeter-wave frequency-modulated signal. When the control center controls the signal transmitting unit to transmit a terahertz millimeter-wave frequency-modulated signal, it acquires the relative position between the target in the signal transmitting unit and the terahertz millimeter-wave radar, and controls the signal transmitting unit to transmit a periodic terahertz millimeter-wave frequency-modulated signal according to the relative position between the target in the signal transmitting unit and the terahertz millimeter-wave radar.

3. The low-cost area monitoring system according to claim 2, characterized in that, The terahertz millimeter-wave radar is placed on a stabilizing device, and the stabilizing device includes: a base, a horizontal mounting base, a horizontal rotating table, a pitch control machine, and a radar mounting base. The base is connected to the horizontal mounting base, the radar mounting base is connected to the horizontal mounting base, the horizontal rotating table is also connected to the horizontal mounting base, the pitch control machine is connected to the end point of the radar mounting base, and both the pitch control machine and the horizontal rotating table are connected to the central control unit, and the pitch control machine is controlled through the central control unit to adjust the pitch angle of the terahertz millimeter-wave radar, and the horizontal rotating table is controlled through the central control unit to adjust the horizontal viewing angle of the terahertz millimeter-wave radar.

4. The low-cost area monitoring system according to claim 3, characterized in that, When the central control unit analyzes according to the signal information of the terahertz millimeter-wave frequency-modulated signal and the signal information of the frequency-modulated signal echo signal, it analyzes according to the target, and analyzes the signal information of the terahertz millimeter-wave frequency-modulated signal transmitted to the target and the signal information of the wave frequency-modulated signal echo signal reflected by the same target to determine the distance from the target to the terahertz millimeter-wave radar, so as to obtain the monitoring information of multiple targets.

5. The low-cost area monitoring system according to claim 4, characterized in that, When the central control unit transmits the monitoring information to the monitoring and analysis unit, it transmits the monitoring information of multiple obtained targets, and uses multi-link transmission during transmission, including: detecting the transmission link to determine whether the transmission link is normal; selecting the target number of main transmission links in the normal transmission links, and determining the transmission scheme according to the main transmission links for the monitoring information; transmitting the monitoring information to the monitoring and analysis unit through multiple transmission links according to the transmission scheme according to the transmission protocol, monitoring the multiple transmission links during the transmission process, and re-transmitting the data of the abnormal link through the non-main transmission link in the normal transmission link when a transmission link abnormality occurs.

6. The low-cost area monitoring system according to claim 1, characterized in that, The low-cost area monitoring system further includes an environmental survey unit, which is connected to the central control unit, is used to acquire environmental factor information, and transmits the environmental factor information to the central control unit. When the central control unit analyzes according to the signal information of the terahertz millimeter-wave frequency-modulated signal and the signal information of the frequency-modulated signal echo signal, it combines the influence of the environmental factor information on signal transmission to obtain monitoring information.

7. The low-cost area monitoring system according to claim 1, characterized in that, When the monitoring and analysis result of the target shows that the target has not changed, information prediction is also performed on the target, and the information prediction includes: In the monitoring information set of the target, after arranging the monitoring information of the target in chronological order, the gradient information of the monitoring information of the target at two adjacent times is obtained; Fitting is performed on the gradient information to obtain the gradient change curve of the monitoring information of the target; Predicting according to the gradient change curve of the monitoring information of the target to obtain the predicted gradient information of the target. When the predicted gradient information of the target does not exceed the preset threshold range, the predicted monitoring analysis result of the target is that the target has not changed. When the predicted gradient information of the target exceeds the preset threshold range, the predicted monitoring analysis result of the target is that the target has changed. Moreover, when the predicted monitoring analysis result of the target is that the target has changed, a danger warning prompt is given for the target.

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