Ultra-massive MIMO (UM-MIMO) hopes to further expand the antenna scale, and use beamforming technology to greatly increase spatial gain. UM-MIMO will reduce the width of the main lobe of the antenna beam and expand the range of the near-field area, thereby reduce the effective coverage of the beam, making it unable to meet the coverage needs of highly mobile users in intelligent transportation. Therefore, it is necessary to select an appropriate beam width based on different position and motion parameters. To this end, this paper first proposes a beam coverage model that considers propagation attenuation, thereby providing a theoretical model of the beamwidth coverage. Then, a main-lobe synthesis method based on Dolph-Chebyshev (DC) weighting is proposed to obtain the weighting vector of the array under the specified main lobe beam width. Simulation results shows that the proposed method can effectively adjust the beamwidth.

Millimeter-wave radar technology has gained significant attention due to its promising applications in various fields, including autonomous vehicles, wireless communications, and remote sensing. According to the survey, research on the propagation characteristics of vehicle-mounted radar in the high-frequency range is relatively limited, and there is even less research on channel propagation characteristics in non line-of-sight (NLoS) scenarios. Therefore, this paper focuses on the measurement and characterization of frequency modulated continuous wave (FMCW) millimeter-wave radar channels at traffic intersections, including channel impulse response (CIR) extraction, Doppler frequency, K-factor and root mean square time delay spread (RMS Time Delay Spread). The findings of this study contribute to a deeper understanding of millimeter-wave radar channels and lay the foundation for the design and optimization of millimeter-wave radar systems in various applications.

Hybrid energy storage system (HESS) is an effective way to mitigate wind power fluctuations on multi-time scale, and can improve influence of large-scale grid-connected wind power on stability and reliability of power system. A novel methodology named zero-phase controlled auto-regressive integrated moving-average (CARIMA) filter is proposed to integrate HESS to smooth wind power fluctuations. First, a design method for zero-phase CARIMA filter is provided, and then used to determine grid-connected power for a wind storage system and size HESS. The reasons, direct current (DC) component caused by energy storage efficiency and grid-connected power delay caused by phase shift, for causing superfluous energy storage configuration are revealed. In addition, a nonlinear programming scheduling strategy considering battery degradation is proposed. Power imbalance caused by efficiency difference during dynamic adjustment of energy storage output power is addressed. Furthermore, thermostatically controlled loads (TCLs) are integrated in sizing and scheduling HESS to reduce energy storage demand and improve operating conditions of energy storage. Finally, effectiveness of the proposed strategy is verified by a case study.

This paper proposes a vehicle trajectory tracking algorithm based on distributed acoustic sensing(DAS). The DAS system can detect and locate along the optical fiber, but because the traditional DAS data processing method is only suitable for counting the traffic flow, it does not have a good effect on obtaining the vehicle's driving track. To track the vehicle trajectory in real time, this paper first uses the double threshold endpoint detection algorithm to process the vehicle vibration signal collected by DAS and then uses the Kalman filter algorithm to optimize the estimation of the result to obtain the vehicle trajectory. The experimental results show that the above method can not only track the vehicle trajectory, but also have a good effect on the estimation of the vehicle speed.

This paper presents an implementation of a channel simulator in software-defined-radio(SDR). The implementation of simulator is implemented on an Universal Software Radio Peripheral (USRP) and GNU Radio software. Simulation part is implemented in GNU Radio software, and RF conversion is performed by USRP. This channel simulator includes multipath simulation and fading simulation, such as Rayleigh and Rician fading channels. Fading simulation is implemented by sum-of-sinusoids-based model, and using fir filter to realize fractional delay in multipath simulation. Using the proposed method, we can efficiently achieve the desired simulate result.

This paper carried out a series of experiments in both the LOS and NLOS scenes, which was based on an unmanned mobile platform, UWB and INS. Throughout experiments, this paper analyzes the ranging error from UWB, verifying that it obeys rice distribution in LOS and lognormal distribution in NLOS respectively; By using TOA combined with GN algorithm, the impact of the number of NLOS links on the positioning error is summarized; Taking the correlation between Links into consideration, their degradation processes was studied; To the end, this paper proposes a DF algorithm based on EKF, whose the positioning error of RMSE is proved to be lower than traditional algorithm.

Based on the analysis of the flow characteristics of radial collector well, a mathematic model was developed by adapting the equivalent hydraulic conductivity and the model of coupled seepage and pipe flow for radial collector well. Through the analysis of the hydro-geological conditions, the manner of radial collector well was proposed to exploit groundwater in the river valley of Qiangtou, Shaanxi. Combining the specific hydro-geological structure with related parameters, the pumpage of each well were calculated by a three-dimensional finite difference method. The newly added reasonable yield was also proposed.