摘要：This paper introduces the design and construction of global navigation satellite systems(GNSS)vulnerability simulation,verification,and mitigation *** platform contains five modules:simulation of the signal-in-space environment,simulation of the vulnerabilities in the space segment,signal quality monitoring and data processing,vulnerability assessment and validation,and integrated *** provides a set of integrated simulations of different types of interference in the GNSS signal propagation domain,including electromagnetic interference,atmospheric disturbances,multipath,and interference in the inter-satellite *** paper focuses on the design of the main system modules and testing through an experimental *** results demonstrate both the effectiveness and realism of the modules and overall platform.

摘要：In this paper,a design of ultraphonic tubulous water communication system based on OFDM is introduced. The system takes PL3106 which is embedded enhanced 8051 microprocessor as the control chip and takes TMS320VC5509 as the core of OFDM *** the paper,the principle of OFDM is introduced *** hardware and software of the system are designed and the experimental results are analysed and concluded.