CN103528548B - A kind of landslide wireless monitoring device and monitoring method - Google Patents
A kind of landslide wireless monitoring device and monitoring method Download PDFInfo
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- CN103528548B CN103528548B CN201310502438.5A CN201310502438A CN103528548B CN 103528548 B CN103528548 B CN 103528548B CN 201310502438 A CN201310502438 A CN 201310502438A CN 103528548 B CN103528548 B CN 103528548B
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Abstract
A kind of landslide wireless monitoring device and monitoring method, comprise the first emitter, second emitter, receiving trap, baseband signal generator, it is domatic that described first emitter is positioned at lower stabilizer, second emitter is positioned at middle part and slides domatic, it is domatic that receiving trap is positioned at upper stabilizer, and baseband signal generator connects the first emitter and the second emitter, and receiving trap connects end device by wireless network.Monitoring device of the present invention has that structure is simple, cost is low, energy consumption is low, deployment point is few, distance accuracy advantages of higher, and monitoring is disposed for a long time in applicable remote districts.Monitoring device good reliability of the present invention, not by the impact of the weather conditions such as rainfall, dense fog, can realize round-the-clock automatic measurement, is easy to safeguard.
Description
Technical field
A kind of landslide wireless monitoring device of the present invention and monitoring method, relate to mountain landslide supervision field.
Background technology
Landslide serious threat the people's lives and property safety, destroys the facility such as building, highway, railway, causes huge economic loss to country, is one of the most serious geologic hazard of China.The complex genesis of landslide, comprises earthquake, earth movement, precipitation, river degradation, groundwater activities, human factor etc., prediction difficulty.Therefore, Real-Time Monitoring carries out to landslide necessary.
Conventional landslide displacement monitoring method can be divided into following 2 classes: interior sight method and outward appearance method.Interior sight fado adopts the deep deformation of the monitoring sliding masses such as tiltmeter, but needs the engineerings such as match-drill excavation, great in constructing amount, Real-Time Monitoring difficulty, and it is less to measure range, and the failure rate of monitoring device is high; The direct means of testing of outward appearance method mainly contains routine monitoring displacement transducer and GPS GPS.Routine monitoring displacement transducer is by being arranged on mobile domatic traction steel wire, adopt various direct or indirect displacement transducer, as movable domatic relative to stablizing domatic displacement in angular transducer, telescopic displacement sensor sensing, but there is the problem of installation inconvenience in such sensor; Common GPS technology monitoring landslide, measuring accuracy is not high, and according to static Differential GPS Technology, the price of its equipment is higher.The Landslide Monitoring device that high precision, low cost, energy robotization are measured in real time still has wide market outlook.
Radio landslide monitoring technology can realize unattended robotization Real-Time Monitoring, and monitoring device is simple, has very high cost performance.The principle of radio landslide monitoring is based on wireless interfeerometry ranging.Traditional method is by two emitters A, B high_frequency sine wave signal that transmission frequency is close simultaneously, interference is produced at receiving trap C, D place, receiving trap C, D will take out the lower-frequency envelope of interference signal and calculate envelope phase Φ c, Φ d after high frequency signals, obtain the phase differential Φ cd=Φ c-Φ d of two acceptance point envelopes, calculate the interference distance that four-place combination ABCD is corresponding, the variable quantity of derivation landslide displacement.The rank that its distance accuracy can reach centimetre, but this precision can not meet the requirement of landslide monitoring.Existing patent " based on the mountain landslide supervision system of radio interference technology " (patent No. 201110091416.5) be optimized said method, by M interferometry in N number of frequency, receives the change of rope function calculating interference distance in conjunction with deviation.This method improves measuring accuracy to a certain extent, but still there are the following problems:
1), need to adopt multiple receiving trap to receive coherent signal to eliminate phase error, monitoring system deployment cost is high; Need between each receiving trap to carry out Network Synchronization time service, add the complexity of receiving trap hardware design.
2), modified hydrothermal process can not eliminate the impact of multipath effect completely.Frequency electromagnetic waves is a kind of spherical wave, the sine wave signal that emitter is launched can be propagated by the shortest path of straight line and arrive receiving trap, also can by arriving receiving trap after the reflections off objects such as ground, mountain forest, the interference signal of reception is the result after the superposition of these signals.There is comparatively big error in the phase place recorded in this case, adopts repetitive measurement to improve phase error, but can not eliminate error, still can cause larger range error.
3), adopt four-place combination to calculate interference distance, algorithm is complicated, requires high to software and hardware configuration.
Summary of the invention
The technical problem to be solved in the present invention is the defect for accurately measuring landslide and software and hardware configuration complexity in prior art online, provides one accurately can measure landslide, structure simple landslide wireless monitoring device and monitoring method.
The technical scheme that the present invention takes is: a kind of landslide wireless monitoring device, comprise the first emitter, second emitter, receiving trap, baseband signal generator, it is domatic that described first emitter is positioned at lower stabilizer, second emitter is positioned at middle part and slides domatic, it is domatic that receiving trap is positioned at upper stabilizer, and baseband signal generator connects the first emitter and the second emitter, and receiving trap connects end device by wireless network.
Described baseband signal generator is connected with the first emitter, the second emitter respectively by high frequency lead, described baseband signal generator produces the sine wave signal of two-way homology, described first emitter, the second emitter offset of sinusoidal signal carry out high frequency modulated, and directional transmissions high-frequency carrier signal.
Air line distance between described receiving trap and the second emitter is much larger than the maximum displacement of domatic permission of sliding.
A kind of landslide wireless monitor monitoring method, is characterized in that comprising the following steps:
1), baseband signal generator produces the sine wave signal of two-way homology, transfers to the first emitter, the second emitter by high frequency lead;
2), the first emitter, the second emitter adopt GHz sine wave to modulate baseband signal, and directional transmissions;
3), receiving trap receive the first emitter, the second emitter signal and carry out reception demodulation, zoom into and wait range signal, then obtain phase differential by coherent detection, record the initial phase difference of baseband signal;
4), within measuring period, measure the phase differential of baseband signal, and initial phase difference compares, calculate the variable quantity of phase differential;
5), according to the change of the change calculations interference distance of phase differential, domatic slippage size of sliding of deriving.
Within a measuring period, carry out the measurement of M phase differential, take the method for multiple averaging, obtain the final phase differential in this cycle and changing value thereof.
There is corresponding relation with the domatic displacement L that slides in the change of described final phase differential △ Φ: △ Φ=2 π Lcosq/l, wherein: l is that base band radio wave-wave is long, and the angle that q is formed for the second emitter and receiving trap line direction and glide direction.
A kind of landslide wireless monitoring device of the present invention and monitoring method, beneficial effect is as follows:
The present invention utilizes radio interference technology, monitors in real time the displacement in Regional Landslide face, landslide, for the monitoring of landslide and early warning provide a kind of novel effective ways.
In monitoring device of the present invention, two emitters share signal source, guarantee that baseband signal differs stable; Launch after adopting modulates baseband signals, extract baseband signal in receiving end demodulation, effectively can suppress the impact that the factor such as multipath effect and weather differs baseband signal, improve measuring accuracy.Monitoring device of the present invention has that structure is simple, cost is low, energy consumption is low, deployment point is few, distance accuracy advantages of higher, and monitoring is disposed for a long time in applicable remote districts.Monitoring device good reliability of the present invention, not by the impact of the weather conditions such as rainfall, dense fog, can realize round-the-clock automatic measurement, is easy to safeguard.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail:
Fig. 1 is the structural representation of a kind of wireless monitor system for mountain landslide supervision of the present invention.
Fig. 2 is the typical layout of a kind of wireless monitor system for mountain landslide supervision of the present invention.
Embodiment
Principle of work:
The present invention, from the principle of interfeerometry ranging, simplifies distance measuring equipment and layout thereof, improves interfeerometry ranging precision, avoid multipath effect and weather etc. the impact of factor; According to the feature of mountain landslide supervision, the arrangement of design monitoring means, realizes high-acruracy survey.
As shown in Figure 1 and Figure 2: a kind of landslide wireless monitoring device, comprise the first emitter 1, second emitter 2, receiving trap 3, baseband signal generator 4, described first emitter 1 is positioned at lower stabilizer domatic 5, and the second emitter 2 is positioned at middle part and slides domatic 6, receiving trap 3 is positioned at upper stabilizer domatic 7, and baseband signal generator 4 connects the first emitter 1 and the second emitter 2.
Described baseband signal generator 4 is connected with the first emitter 1, second emitter 2 respectively by high frequency lead, described baseband signal generator 4 produces the sine wave signal of two-way homology, described first emitter 1, second emitter 2 offset of sinusoidal signal carries out high frequency modulated, and directional transmissions high-frequency carrier signal.
Air line distance L2 between described receiving trap 3 and the second emitter 2 is much larger than the maximum displacement of domatic permission of sliding.First emitter 1 is L1 with the air line distance of receiving trap 3.
The present invention arranges the first emitter 1 on the lower stabilizer of near-end domatic 5, arranges the second emitter 2 in middle part slip domatic 6; Receiving trap 3 is set at the upper stabilizer of far-end domatic 7, the change of receiving trap 3 detected phase difference, calculates slide displacement amount, result of calculation is sent to end device 9 by wireless network 8.Second emitter 2 is apart from more than receiving trap 1000m.The first emitter 1, second emitter 2 adopted in the present invention and receiving trap 3 are not point-blank arranged, form one and measure combination.
A kind of landslide wireless monitor monitoring method, comprises the following steps:
1): baseband signal generator 4 produces the sinusoidal wave baseband signal of 600MHz of two-way homology, and baseband signal transfers to the first emitter 1, second emitter 2 by high frequency lead.
: the first emitter 1, second emitter 2 adopts the baseband signal of the sinusoidal wave reciprocity amplitude of 2.4GHz to modulate, and directional transmissions 2).
3): receiving trap 3 receives the signal of the first emitter 1, second emitter 2 and carries out reception demodulation, zoom into and wait range signal, then obtain phase differential by coherent detection, record the initial phase difference Φ 0 of baseband signal.
4): within measuring period, M=10 time is carried out to baseband signal and measure, the phase differential Φ n be averaged, and initial phase difference Φ 0 compares, calculate the variable quantity △ Φ n=Φ n-Φ 0 of phase differential;
5): according to the change of the change calculations interference distance of phase differential, domatic change of sliding of deriving, concrete steps are as follows:
According to interfeerometry ranging principle, there is following relation in the variable quantity of interference distance and phase differential, the wavelength of baseband signal:
When the position of the second domatic emitter 2 that slides changes, interference distance will change, thus phase differential also will change.Because glide direction may be inconsistent with the line direction of the second emitter 2 and receiving trap 3, if there is angle q, measured slippage L=△ d12/cosq.
The angle q etc. that the baseband signal amplitude demodulated due to receiving trap 3 and the second emitter 2 and receiving trap 3 line direction and glide direction are formed has a direct impact measuring accuracy.Baseband amplitude is equal, angle is less, and measuring accuracy is higher.When the line direction of glide direction and the second emitter 2 and receiving trap 3 is consistent, slippage equals interference distance.
When the frequency selecting baseband signal is 600MHz, electromagnetic wavelength is 0.5m.When the detection accuracy of phase place change reaches 1 °, the monitoring accuracy of slippage is 1.4mm, is measured can be effectively reduced stochastic error by multiple averaging.Landslide is 5 ~ 10mm at acceleration deformation stage daily variation, and large can reach 80mm, only just can reach more than 100mm at the daily variation facing sliding sharply deformation stage, and this is all within the monitoring range allowed (being less than a wavelength).
Claims (3)
1. a mountain landslide supervision method, it is characterized in that, comprise a kind of landslide wireless monitoring device, this device comprises the first emitter (1), second emitter (2), receiving trap (3), baseband signal generator (4), described first emitter (1) is positioned at lower stabilizer domatic (5), second emitter (2) is positioned at middle part and slides domatic (6), receiving trap (3) is positioned at upper stabilizer domatic (7), baseband signal generator (4) connects the first emitter (1) and the second emitter (2), receiving trap (3) connects end device (9) by wireless network (8), described baseband signal generator (4) by high frequency lead respectively with the first emitter (1), second emitter (2) connects, described baseband signal generator (4) produces the sine wave signal of two-way homology, described first emitter (1), second emitter (2) offset of sinusoidal signal carries out high frequency modulated, and directional transmissions high-frequency carrier signal, air line distance (L2) between described receiving trap (3) and the second emitter (2) is much larger than the maximum displacement of domatic permission of sliding,
Monitoring step is as follows:
1), baseband signal generator (4) produces the sine wave signal of two-way homology, transfers to the first emitter (1), the second emitter (2) by high frequency lead;
2), the first emitter (1), the second emitter (2) adopt GHz sine wave to modulate baseband signal, and directional transmissions;
3), receiving trap (3) receive the first emitter (1), the second emitter (2) signal and carry out reception demodulation, zoom into and wait range signal, then obtain phase differential by coherent detection, record the initial phase difference of baseband signal;
4), within measuring period, measure the phase differential of baseband signal, and initial phase difference compares, calculate the variable quantity of phase differential;
5), according to the change of the change calculations interference distance of phase differential, domatic slippage size of sliding of deriving.
2. a kind of mountain landslide supervision method according to claim 1, is characterized in that, within a measuring period, carry out the measurement of M phase differential, take the method for multiple averaging, obtain the final phase differential in this cycle and changing value thereof.
3. a kind of mountain landslide supervision method according to claim 2, it is characterized in that, there is corresponding relation with the domatic displacement L that slides in the change of described final phase differential △ Φ: △ Φ=2 π Lcosq/l, wherein: l is that base band radio wave-wave is long, the angle that formed for the second emitter (2) and receiving trap (3) line direction and glide direction of q.
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| CN105632107A (en) * | 2014-10-31 | 2016-06-01 | 南京思摩特农业科技有限公司 | Hillside land landslide early-warning method |
| CN105258674B (en) * | 2015-10-13 | 2018-06-29 | 中国十七冶集团有限公司 | A kind of tunnel subsidence and convergent observation procedure |
| CN106205059B (en) * | 2016-06-23 | 2019-04-12 | 西北大学 | A kind of early warning system and method for slide creep monitoring |
| CN109341811B (en) * | 2018-10-23 | 2020-07-03 | 成都理工大学 | Landslide monitoring method |
| CN116295037B (en) * | 2023-04-11 | 2023-11-14 | 广东省水利水电建设有限公司 | Ecological slope monitoring method |
| CN117110991B (en) * | 2023-10-25 | 2024-01-05 | 山西阳光三极科技股份有限公司 | Strip mine side slope safety monitoring method and device, electronic equipment and medium |
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| EP2204669A1 (en) * | 2008-12-30 | 2010-07-07 | Atmel Automotive GmbH | System, method and switch for measuring the distance between two nodes of a wireless network |
| IT1404537B1 (en) * | 2011-02-25 | 2013-11-22 | Sisvel Technology Srl | METHOD FOR ESTIMATING THE DISTANCE OF A RECEIVER FROM A RADIO TRANSMITTER, RELATED METHODS FOR CALCULATING THE POSITION OF A MOBILE TERMINAL, MOBILE TERMINAL AND DEVICE. |
| CN102253379B (en) * | 2011-04-11 | 2013-01-30 | 中国人民解放军理工大学 | System for monitoring landslide based on radio interference technology |
| CN203501991U (en) * | 2013-10-23 | 2014-03-26 | 三峡大学 | Wireless monitoring apparatus for mountain landslide |
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