Rearch On Anti-irradiation Technology Of LTE Uplink Synchronization Process

Onboard processing is the core technology of satellite mobile communication system. Construction of spaceborne platform based on COTS devices is one of the most popular technology method in the industry. Research on soft fault-tolerant, soft reinforcement technology for industrial/commercial devices is most concerned. Fault-tolerant technology of Spaceborne platform data flow and control flow as an entry point for research, we analyzed the basic feature of spaceborne LTE uplink synchronization related data flow and control flow in detail, then concluded a method of error detection and correction for data flow and control flow. The main contents are as follows:1. The current error propagation analysis method is not so good for identifying large-capacity data processing system’s weak points, so we proposed a software data stream vulnerabilities identification based network node degree by complex network theory and Spaceborne LTE uplink synchronization system high-capacity data processing needs. By delimiting SEU error penetration, we adopted matrix method of description to construct error propagation network model, transforming software data stream vulnerabilities mining to network key node mining, to search all local minima by a certain probability of false alarm In order to achieve all of the data stream vulnerabilities mining by this probability of false alarm. The simulation results showed that this algorithm can spot Spaceborne LTE uplink synchronization high-capacity data processing system vulnerabilities effectively.2. Based on low complexity encoding and decoding algorithms, a kind of data stream error correction method is proposed to deal with the Spaceborne handling data stream error by SEU. The algorithm can effectively reduce the complexity of encoding and decoding algorithms by using simple shift and XOR operations to achieve adjoint matrix solver. Simulation results show that: LCCE algorithm lower computational complexity gets as good error detection and correction performance as SBC method does.3. A kind of control flow label design based on extended block is proposed for Spaceborne processing control flow errors caused by SEU. The method first does a modeling analysis for detection performance and fault tolerance overhead of control flow label detection method, under the conditions of a given basic block error detection probability, to derive the extreme solution of number of detecting points required for, as a reference of within block error detection point setting, then combine the CCFS algorithms and extended block division method, by Optimizing basic block and ECCFS detection label set point to take care error in and between block detection performance.4. Based on Simple Scalar simulator, we constructed a fault injection experiment platform to take a simulation experiment on mentioned data flow error correction algorithm and fault-tolerant control flow method, Verified related algorithms’ fault-tolerant performance.