GNSS (Global Navigation Satellite System) displacement monitoring terminal and corner reflector combined system for monitoring land subsidence

Abstract

The utility model discloses a global navigation satellite system (GNSS) displacement monitoring terminal and corner reflector combined system for ground subsidence monitoring, which comprises a global navigation satellite system (GNSS) and a plurality of monitoring point positions, the global navigation satellite system (GNSS) comprises a plurality of satellites, subsidence monitoring components are distributed on the monitoring point positions, and the monitoring point positions are connected with the ground subsidence monitoring components. Each settlement monitoring assembly comprises an InSAR corner reflector and a plurality of GNSS (Global Navigation Satellite System) monitoring terminals arranged around the InSAR corner reflector, and the InSAR corner reflector is matched with the GNSS monitoring terminals. The settlement monitoring assemblies are arranged on the ground to be monitored according to monitoring points, relative position change data and absolute position change data can be obtained through monitoring, the two kinds of data can be conveniently fused for composite analysis of ground settlement monitoring, the change data of the ground to be monitored can be described more accurately and vividly, the data precision and reliability are improved, and the monitoring accuracy is improved. And the monitoring data is obviously enriched.

Description

Technical Field

[0001] The utility model relates to the field of ground subsidence monitoring, in particular to a GNSS displacement monitoring terminal and corner reflector combination system for ground subsidence monitoring. Background Art

[0002] Corner reflectors (an auxiliary device in radar applications) are made of metal plates into radar wave reflectors of different specifications according to different application requirements. When the radar electromagnetic wave scans the corner reflector, the electromagnetic wave will generate a strong reflected echo signal on the metal corner reflector. For this reason, the measurement point equipped with a corner reflector can be used as a key point, feature point, reference point or calibration point of the monitoring target, and is widely used in aerospace, space-to-earth observation, ground and building settlement monitoring, ship distress rescue, long-distance measurement and related military fields. For example, in space-to-earth observation technology, a synthetic aperture radar (InSAR) based on interferometric measurement technology is installed on a satellite. The radar transmits microwaves to the target area on the ground, receives the echo reflected by the target area, and then obtains the topography, landform and surface micro-changes of the target area. The Global Navigation Satellite System (GNSS) can also obtain position changes of the target area by setting monitoring points. How to monitor the change of ground subsidence (i.e., the terrain of the target area) and obtain change data is an important problem in large-area monitoring applications and an important part of operation and maintenance. Utility Model Content

[0003] The purpose of the utility model is to solve the technical problem of monitoring and acquiring ground subsidence change data, and to provide a GNSS displacement monitoring terminal and corner reflector combination system for ground subsidence monitoring, which can monitor and obtain relative position change data and absolute position change data, and perform composite analysis of ground subsidence monitoring by fusing the two types of data, so as to more accurately and realistically describe the change data of the ground to be monitored.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] A GNSS displacement monitoring terminal and corner reflector combination system for ground subsidence monitoring includes a global navigation satellite system GNSS, a plurality of monitoring points and a monitoring terminal. The global navigation satellite system GNSS includes a plurality of satellites. Subsidence monitoring components are arranged on the monitoring points. Each subsidence monitoring component includes an InSAR corner reflector and a plurality of GNSS monitoring terminals arranged around the InSAR corner reflector. The InSAR corner reflector cooperates with the GNSS monitoring terminal.

[0006] In order to better realize the utility model, the settlement monitoring component includes an InSAR corner reflector and two GNSS monitoring terminals, the two GNSS monitoring terminals are GNSS monitoring terminal A and GNSS monitoring terminal B, and GNSS monitoring terminal A and GNSS monitoring terminal B are symmetrically arranged on both sides of the InSAR corner reflector.

[0007] Preferably, a pier is provided on the ground where the monitoring point is located, and the settlement monitoring component is arranged and fixed on the pier accordingly.

[0008] Preferably, the InSAR corner reflector is a trihedral square corner reflector.

[0009] Preferably, the GNSS monitoring terminal is a GNSS displacement monitoring terminal.

[0010] Preferably, the utility model further comprises a monitoring platform communicatively connected to the monitoring terminal.

[0011] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0012] The utility model arranges settlement monitoring components on the ground to be monitored according to monitoring points, can monitor and obtain relative position change data and absolute position change data, is convenient for fusing the two types of data for fusion and composite analysis of ground settlement monitoring, more accurately and realistically describes the change data of the ground to be monitored, improves data accuracy and reliability, and significantly enriches the monitoring data. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] The names corresponding to the reference numerals in the accompanying drawings are:

[0015] 1-base pier, 2-InSAR corner reflector, 3-GNSS monitoring terminal A, 4-GNSS monitoring terminal B. DETAILED DESCRIPTION

[0016] The utility model is further described in detail below in conjunction with embodiments:

[0017] Example

[0018] like Figure 1As shown, a GNSS displacement monitoring terminal and corner reflector combination system for ground subsidence monitoring includes a global navigation satellite system GNSS (including several satellites), several monitoring points and several monitoring terminals. The utility model is mainly used for acquiring monitoring data of ground subsidence in order to analyze ground subsidence monitoring data; when in use, each monitoring point is a benchmark point or key point arranged on the ground for important monitoring. The global navigation satellite system GNSS includes several satellites, and a subsidence monitoring component is arranged at the monitoring point. Each subsidence monitoring component includes an InSAR corner reflector 2 (keeping the radar incident wave direction and the normal direction of the corner reflector coincident) and several GNSS monitoring terminals arranged around the InSAR corner reflector 2. The InSAR corner reflector 2 is preferably a trihedral square corner reflector (the signal enhancement effect of the maximum radar cross-sectional area of ​​the corner reflector is not less than 20dB. For the X-band electromagnetic waves commonly used in remote sensing, a corner reflector made of anodized aluminum material with an edge length of 0.4m can meet the requirements. The InSAR corner reflector 2 is the standard target point for satellite monitoring of the ground. The GNSS monitoring terminal receives the navigation signal of the global navigation satellite system GNSS. In some embodiments, the monitoring terminal (short for displacement monitoring terminal or GNSS monitoring terminal) mainly includes a GNSS antenna, a navigation chip, a solar panel, a main control box (with a main control and communication transmission module) and a mounting bracket. The device can upload data to the monitoring platform through the 4G (fourth generation mobile communication system) signal network, and is usually used for surface positioning displacement monitoring or building deformation monitoring. Preferably, as Figure 1As shown, the subsidence monitoring component includes an InSAR corner reflector 2 and two GNSS monitoring terminals 3, the two GNSS monitoring terminals are GNSS monitoring terminal A3 and GNSS monitoring terminal B4, and the GNSS monitoring terminal A3 and the GNSS monitoring terminal B4 are symmetrically arranged on both sides of the InSAR corner reflector 2. An aperture radar is installed on the satellite of the global navigation satellite system GNSS, and the aperture radar transmits electromagnetic waves to each InSAR corner reflector 2 and receives the echo sent back by the InSAR corner reflector 2. The InSAR corner reflector 2 constitutes a ground reference point when the satellite monitors the ground imaging. The InSAR corner reflector 2 cooperates with the GNSS monitoring terminal. The InSAR corner reflector 2 and the aperture radar on the satellite constitute a relative position change monitoring unit of the monitoring point where the subsidence monitoring component is located (interferometric imaging is implemented on the ground of the monitoring point and relative position change is obtained), thereby obtaining the relative position change data of the monitoring point; the GNSS monitoring terminal and the satellite of the global navigation satellite system GNSS constitute an absolute position change monitoring unit of the monitoring point where the subsidence monitoring component is located, thereby obtaining the absolute position change data of the monitoring point. The utility model is equipped with a power supply system (which can be powered by batteries plus solar energy on the one hand and by mains electricity plus an AC / DC converter on the other hand), which supplies power to ground equipment of the GNSS displacement monitoring terminal and corner reflector combination system.

[0019] The utility model is mainly used for acquiring monitoring data of ground subsidence. When in use, monitoring points are arranged on the ground pier 1. Taking one of the monitoring points as an example, a settlement monitoring component is arranged on the monitoring point. The InSAR corner reflector 2 in the settlement monitoring component receives the radar electromagnetic wave or electromagnetic wave signal of the satellite to obtain the data of the monitoring point, implements interferometric imaging, and then the relative position change data can be obtained by two measurements before and after, as a type of monitoring data for ground subsidence monitoring. The two GNSS monitoring terminals A in the settlement monitoring component communicate with the satellite of the global navigation satellite system GNSS in dual redundancy (receive the signal of the global navigation satellite system GNSS in dual redundancy) and locate the position information of the monitoring point to obtain the absolute position data, and then the absolute position change data can be obtained by two measurements before and after, as another type of monitoring data for ground subsidence monitoring. Thus, two types of data for ground subsidence monitoring can be obtained, which is convenient for subsequent accurate analysis of ground subsidence by combining the two types of data (examples of accurate analysis applications are as follows: generating the best integrated fusion approximation function to achieve the purpose of correcting and improving the absolute accuracy of geodetic coordinates; at the same time, generalized interpolation and extrapolation processing is performed between the best approximation function data that are discontinuous in the time domain, and the approximation function data that are continuous in the time domain after fusion are obtained, completing the fusion of data in the space domain and the time domain). The utility model can reduce errors, is conducive to improving or enhancing the overall monitoring performance of the system, can more realistically describe the changes and laws of geological points and surrounding geological bodies, and is conducive to providing accurate research and correct early warning.

[0020] like Figure 1 As shown, a pier 1 is provided on the ground where the monitoring point is located (multiple monitoring points are set on the ground, and the ground where the monitoring points are located is the pier), and the settlement monitoring components are arranged and fixed on the pier 1 accordingly, and the pier 1 is required to ensure the foundation level.

[0021] The utility model also includes a monitoring platform that is communicatively connected to the monitoring terminal. The communication connection can adopt a 4G or 5G communication network, and the monitoring platform can communicate and receive data.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A GNSS displacement monitoring terminal and corner reflector combination system for ground subsidence monitoring, comprising a plurality of monitoring points, characterized in that: It also comprises a GNSS monitoring terminal, wherein a settlement monitoring component is arranged at the monitoring point, each settlement monitoring component comprises an InSAR corner reflector (2) and a plurality of GNSS monitoring terminals arranged around the InSAR corner reflector (2), and the InSAR corner reflector (2) cooperates with the GNSS monitoring terminal.

2. The GNSS displacement monitoring terminal and corner reflector combination system for ground subsidence monitoring according to claim 1, characterized in that: The subsidence monitoring component comprises an InSAR corner reflector (2) and two GNSS monitoring terminals, wherein the two GNSS monitoring terminals are respectively a GNSS monitoring terminal A (3) and a GNSS monitoring terminal B (4), and the GNSS monitoring terminal A (3) and the GNSS monitoring terminal B (4) are symmetrically arranged on both sides of the InSAR corner reflector (2).

3. The GNSS displacement monitoring terminal and corner reflector combination system for ground subsidence monitoring according to claim 2, characterized in that: A pier (1) is provided on the ground where the monitoring point is located, and the settlement monitoring component is arranged and fixed on the pier (1) accordingly.

4. The GNSS displacement monitoring terminal and corner reflector combination system for ground subsidence monitoring according to claim 1, characterized in that: The InSAR corner reflector (2) is a trihedral square corner reflector.

5. The GNSS displacement monitoring terminal and corner reflector combination system for ground subsidence monitoring according to claim 1, characterized in that: The GNSS monitoring terminal is a GNSS displacement monitoring terminal.

6. The GNSS displacement monitoring terminal and corner reflector combination system for ground subsidence monitoring according to claim 1, characterized in that: It also includes a monitoring platform that is communicatively connected to the GNSS monitoring terminal.

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