An analysis and research on composite modulation algorithm
This paper focuses on the problem of Doppler spread caused by high-speed target motion during coherent accumulation period for linear FM signals, then a Dual linear FM composite algorithm is proposed. The theory analysis and simulation are presented, and the conventional processing algorithm is compared with the proposed algorithm based on the echoed signal. The results shows that the composite algorithm is useful and able to be realized in engineering.
Integration Detection Research for Moving Target with High Velocity Based on Changeable Pulse Width Waveform
This paper presents a new method of transmiting changeable pulse width signals to solve the problem of a high velocity target coherent integration at low signal-to-noise ratio with meter-wave low pulse repetition frequency radar.First,wide pulse echoes are used to estimate the moving parameters.Secondly,narrow pulse echoes are coherent integrated after target envelope motion and phase compensation.This may ensure the radar range resolution.This method solves the coherent integration problem of a target range and Doppler migration with high radial velocity and acceleration.Simulations testify the validity of the new algorithm.
Frequency selective surface design for blinds applications
In this paper, the reconfigurable blind structure with frequency selective surfaces(FSS) for the building applications are presented. Frequency transmission characteristics for different angles of the proposed blind-FSSs are investigated and verified through simulation and measurement. The simulation results show that we can implement the reconfigurable blind-FSS for multiband wireless applications. To verify the proposed paper, two kinds of blind-FSSs, crossed dipole FSS and circular ring FSS are fabricated and measurements are performed for different angles. The proposed structure in this paper which is very simple, can be easily applied to any planar surface for wireless security applications at low cost.