Applied Mechanics and Materials Vols. 713-715

Abstract: In this paper, we propose an interference location method based on different times of TDOA (the time difference of arrival) which only used two satellites (the main satellite and its adjacent satellite). Firstly, the model of interference location is built based on two different TDOA data and one spheroid model of earth. Subsequently, a series of practical data of communication satellites are calculated with this model and the trust-region method, aiming to test the validity of the proposed model. Furthermore, comparing with some other methods, such as some researchers based on TDOA and FDOA (the frequency difference of arrival) or TDOA method using three satellites, the result of our method is much more accurate (the interference could be located to 20 km successfully) and more available. Numerical simulations are made to verify the capability and validity of the proposed method.

Abstract: For multilayer mobile sensor network, the issues of improving sensor network coverage by the use of mobile sensors are studied. A coverage-optimized deployment algorithm based on grid-division and bipartite graph matching is proposed. Firstly, the deployment area is divided into many grids and build distribution matrix of sensor nodes. Then construct a bipartite graph G based on the grid-division and solve a matching of maximum cardinality of G. It corresponds to an optimal deployment scheme which maximizes the network coverage and minimizes the total movement cost. Results show that after optimized deployment the network coverage increases, and with the increase in the percentage of mobile nodes it increases accordingly. In the way of distributed calculating the network also can achieve a higher coverage ratio and the movement cost is lower. It is very suitable for deployment of multilayer sensor network.

Abstract: The small-scale fading model for HAP-based communication channel is analyzed, the structure and algorithm of double-binary Turbo encoding and decoding are studied. Numerical results show the BER performance with different interleaving depth and interleaving length of double-binary Turbo codes using QPSK modulation over Rayleigh fading channel.

Abstract: In urban rail transit, renewable energy absorption device set in substations can make trains apply renewable energy braking as much as possible, thus can reduce environmental pollution and prevent from tunnel temperature rise; the effective utilization of renewable energy can reach the purpose of energy-saving emission-reduction. The thesis makes analysis and comparison upon the absorption technology of renewable energy of trains, demonstrates advantages and disadvantages of various absorption schemes, it has certain reference value for design of renewable braking energy utilization schemes of trains in rail transit engineering.

Abstract: The Classical MUSIC algorithm points out that in order to distinguish N waves from different directions,an N element array is needed. Therefore, in order to distinguish multi-detect signal simultaneously, an array is needed ,the payload of satellite and reconnaissance aircraft platform is limited , large array antenna can’t be placed, and application of MUSIC algorithm is restricted on these platform. In this paper a MUSIC algorithm with single antenna is proposed using movement of single antenna, the resource-demanding disadvantage of classical is improved.This algorithm can be used on resource limit satellite and aircraft platform.This algorithm is verified efficacious in the paper by simulation.

Abstract: Traditional transfer alignment must use a pure Inertial Navigation System (INS) as the reference, because using the integrated navigation system as the reference would disrupt the transfer alignment process and lead to the divergence of the fine alignment filter. But there are some cases require the cooperation between the master INS and slave INS for long time duration, such as mapping. To guarantee the accuracy of the master INS, integrated navigation feedback is needed. So, transfer alignment technique using the integrated navigation system as the reference is required. Taking the error of master INS into account, a transfer alignment attitude error in the body frame was defined, which makes the transfer alignment attitude error free from the impact of integrated navigation feedback corrections. Then, its error equations were developed and a Kalman filter was designed based on it. Finally, a transfer alignment simulation using a GPS/INS integrated navigation system as reference was performed to validate the proposed scheme.

Abstract: The power delay profile (PDP) of the single antenna full-duplex self-interference channel (SIC) is studied in the indoor environments in this paper. We perform the measurements at the center frequency of 2.4 GHz with 100 MHz bandwidth. The PDP can be decomposed into three components: leakage path (LP), antenna reflection path (ARP), and space multipath (SMP). Furthermore, we get the model of the profiles of the leakage path and the antenna reflection path. The space multipath can be modeled as power-law decay plus a random variable with lognormal statistics.

Abstract: In this paper, author uses the camera as a capture tool for video, and then uses the ARToolKit, develops a assembling computer experiment based on augmented reality. It can run leave from the hardware environment, save equipment, reduce equipment loss and save the experimental cost. If this method is applied to high cost or dangerous operating experiment, it is helpful.

Abstract: Visible Light Communication (VLC) technology is one of the main candidate solutions for Intelligent Transportation Systems (ITS). This paper presents a comprehensive study on VLC based anti-rear-end collision scheme on the highway. A detailed VLC based rear-end collision avoidance model is proposed with theoretical analysis and numerical simulations.

Abstract: Optimization of microwave filter structure parameter based on traditional learning methods faces problems like long design cycles, complex calculation and sensitive to initial value, and so on. A hybrid trust region algorithm which combine the improved trust region with the advance and retreat method is introduced to the field of optimization of microwave filter structure parameter for the first time. Comparison between the methods based on the traditional trust region method and the improved trust region method reveals that the algorithm can significantly increase precision and speed of optimization model of the microwave cavity filter parameters.