Research On Key Technologies Of Floating Test Platform Nodes

In the field of dynamic testing and water monitoring,due to the flexible deployment flexibility of the floating test platform,the platform is used for network testing.The flexibility of node sampling is a key factor of platform applicability,and the accuracy of node positioning is an important guarantee for network testing.Therefore,the dissertation focuses on the key techniques for improving the positioning accuracy and node flexibility of floating test platforms.On the basis of determining the overall scheme of the platform,this paper first studies the problem of rapid and accurate positioning of the platform.The core of positioning technology is the node distance calculation based on correlation algorithms.Based on the problems associated with the 16384-point ultra-long chaotic source code and the infinite-length signal,a long-term source code real-time correlation technology is proposed,which reduces the number of single-correlation calculation points to 2048 points.And through the frequency domain transform method and hardware acceleration algorithm,it further reduces the amount of related operations by more than 90% and solves the problem of hardware implementation of chaos ranging method.At the same time,the multi-channel positioning signals are calculated in parallel,and by optimizing the algorithm structure,the positioning speed is increased by 4 times while reducing the amount of operations by half.In order to improve the flexibility of the platform node channel configuration,a parameter management mechanism and a parameter bus structure are proposed.The dozens of parameters of eight channels are stored and managed centrally,which enhances the timeliness and scalability of the parameter configuration.At the same time,the trigger management mechanism is used to achieve the triggering,external triggering,independent or synchronous triggering in each channel,and the dynamic allocation of buffer space,so that the single-channel signal pre-cached points up to 1M,to achieve the independent collection of 8-channel signals,to improve the flexibility of the sampling function.Finally,a hardware system was made based on the scheme.Through the Luohe positioning experiment,it was verified that the positioning time of the system was less than 100 ms,and the positioning error was less than 20 cm,which was in line with the actual engineering requirements.The system is applied in a dynamic underwater test.The test results show that the system can effectively receive the upper computer command and perform the corresponding operation.Through the parameter adjustment,it can adapt to various types of sensors and complete the 8-channel independent acquisition.