星載LTE上行同步處理抗輻照技術(shù)研究
[Abstract]:In recent years, the construction of spaceborne platform based on commercial devices has become one of the important technical means to improve onboard processing capability. The first problem to be solved in building a spaceborne platform based on commercial devices is irradiation-resistant, so researchers at home and abroad have carried out research on soft fault-tolerant and soft reinforcement techniques for non-aerospace devices. Based on the national 863 plan in the field of satellite communication, this paper takes the fault-tolerant technology of spaceborne processing platform and control flow as the breakthrough point, and analyzes in detail the basic characteristics of the data stream and control flow related to the uplink synchronous processing of spaceborne LTE. This paper presents a method to identify the weak points of software data flow, studies the soft fault-tolerant technology of data flow and control flow, and presents the design of fault-tolerant method. The main research contents are as follows: 1. Aiming at the problem that the existing methods of error propagation analysis have a large deviation in identifying the weak points of large capacity data processing software, combined with the requirement of space-borne LTE uplink synchronization processing, large capacity data processing, By introducing the theory of complex network, a method of software data stream vulnerability identification based on network node degree is proposed. Based on the error propagation analysis method, the error propagation network model is constructed by defining the single particle flip error permeability and using the matrix description method. The software data stream fragile point mining problem is transformed into a network key node mining problem, and all local extremum are searched with a certain false alarm probability, and all the data stream fragile points mining under the false alarm probability is realized. The simulation results show that this method can effectively identify the weak points in the space-borne LTE uplink synchronization processing. A data Stream error Correction method based on low complexity coding and Decoding algorithm LCCE. The algorithm uses simple shift and XOR to solve the adjoint matrix, which can not avoid the two judgment branches of the SBC method, reduce the complexity of the encoding and decoding algorithm and reduce the time cost. The simulation results show that the LCCE method achieves the same anti-SEU error correction performance as the SBC method with low computational complexity. 3. The control flow error caused by single-particle flipping is the same as that of the SBC method. A design method of configurable control flow label based on extension block is proposed. In this method, the detection efficiency and fault-tolerant overhead of the control flow label detection method are first modeled and analyzed, and the minimum value of the number of detection points is deduced for any given basic block error detection probability. As a reference for the design of configurable labels; Then, in order to realize this configuration, the ECCFS algorithm is combined with the extended block partition method. According to the reference of label design, the tag design is realized under the given detection requirement by extending block partition, ECCFS tag format adjustment and detection point setting. This method takes into account the performance of error detection within and between blocks. 4. Based on the Simple Scalar simulator, the fault injection experiment platform is constructed, and the error correction method of the proposed data flow and the fault-tolerant method of the control flow are simulated through the fault injection experiment. The fault-tolerant performance of the algorithm is verified.
【學(xué)位授予單位】:解放軍信息工程大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:TN929.5
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