Multi-site interference offset method in large-scale building deformation telemetry technology

Abstract

The invention discloses a multi-site interference offset method in a large-scale building deformation telemetry technology, and belongs to the technical field of building deformation monitoring. In order to achieve the purpose of eliminating multi-site interference, the multi-site interference offset method for the large-scale building deformation telemetry technology includes the following steps: (1) the combination of the differences of spreading codes of the width of different integral number chips is used on beacon generator terminals as the spreading codes of beacon machines, the spreading codes of any two beacon machines are crossly correlated, are equal to 0 and are completely orthogonal; (2) the beacon machines modulate a radio-frequency carrier of identical frequency and identical phase by means of the orthogonal spreading codes, spread spectrum signals are generated; and (3) a telemetering receiver captures and tracks the spreading codes of the synchronous beacon machines, corresponding dispreading is conducted after synchronization, the carrier signals of the beacon machines are recovered, and multi-site interference is eliminated. By means of the multi-site interference offset method for large-scale building deformation telemetry technology, the defects in the prior art are overcome, the address code of spread spectrum modulation of an initiative beacon machine is designed reasonably, the relative dispreading circuit of a receiving end receiver is improved, the reliability of capture and tracking of a false code is guaranteed, the problem of multi-site interference in the prior art is solved completely, and therefore the measurement accuracy of the deformation monitoring system is improved.

Description

technical field [0001] The invention belongs to the technical field of building deformation monitoring, and relates to a method for canceling multiple-site interference in large-scale building deformation telemetry technology. Background technique [0002] In nature, under the action of various influencing factors, the shape, size and position of buildings will change in time domain space, such as the swing of high-rise buildings and the deformation of dams. When the amount of deformation exceeds the allowable range that the deformable body can bear, it will bring serious disasters to human production and life, so it is of great significance to monitor the deformation of objects. [0003] Patent CN101349753A proposes a deformed telemetry technology and method. Its basic working principle is to install a radio beacon on the object to be measured, and to arrange a telemetry receiver at a distance. The beacon uses different pseudocodes to modulate the carrier wave of the same f...

AI Technical Summary

Problems solved by technology

However, the Walsh code has poor autocorrelation characteristics, that is, when it correlates itself with its own delay, the result is not 0, which is not conducive to the capture and tracking of pseudocodes; at the same time, the number is small, such as a 16bitWalsh code has only 16; the randomness is poor, Each code group of the Walsh code cannot be used as a spreading code due to different spectral bandwidths.

Similarly, the Gold code also has the problem of multiple access interference

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