Abstract
Sensor placement plays an important role in terrain deformation monitoring systems and has an essential effect on data collection. The difficulty of sensor placement entails obtaining the most adequate and reliable information with the fewest number of sensors. Most sensor placement schemes are currently based on randomized non-uniform sampling and probability statistics, such as structural modality and optimization methods, which are difficult to directly apply due to the randomness and spatial heterogeneity of terrain deformation. In this study, the placement conditions of two-dimensional non-uniform sampling with equal arc length were deduced for underwater terrain deformation monitoring based on the MEMS accelerometer network. In order to completely reconstruct the underwater terrain, the arc length interval of the sensors should be less than 12Ω (Ω is the maximum frequency of the detected terrain). The maximum MRE and maximum RMSE were both less than seven percent in a terrain deformation monitoring experiment and a water tank test. The research results help technicians apply contact sensor arrays for underwater terrain monitoring.
Highlights
We assumed that the amplitude frequencies with different shapes were within the highest The three shapes were tested verify non-uniform sampling with equal arc length.acabove-obtained frequency range.to
The results showed that the arc-length interval between the sensors can be determined according to the two-dimensional non-uniform sampling condition
This article presented a sensor placement strategy with two-dimensional equal arc length non-uniform sampling for underwater terrain deformation monitoring and a mathematical model of two-dimensional uniform sampling
Summary
Underwater terrain monitoring is an important task in marine exploration and development. Monitoring the subsidence or uplift of underwater terrain provides early warning for the occurrence of underwater geological disasters [1,2]. During the exploration and production of submarine gas hydrates, the decomposition of hydrates destroys the sediment structure and causes land subsidence, which may lead to geological disasters (e.g., collapse, landslides, and earthquakes) that endanger gas hydrate exploration [3]. The principal devices for underwater terrain surveys include single-beam [4,5] and multi-beam sounding sonar [6,7,8,9] and contact sensor monitoring methods, such as fiber. Contact sensor detection technology follows the movement or deformation of underwater terrain and is characterized by traceability, real-time capabilities, high precision, long duration, and continuous monitoring [11]
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