Analysis and Solution of Multipath Effect on Wireless Communications of Launch Vehicle

The electrical system in a launch vehicle contains multiple wireless communications systems. A large number of prelaunch tests are needed to verify the correctness and reliability of electric systems at the launch site. The complex electromagnetic environment at a launch site will inevitably cause multipath effect which interfere with prelaunch tests. Theory analysis and simulation of multipath effect, combined with engineering practice, can effective identify and quickly correct abnormal situations, and identify methods and measures to eliminate the influence of multipath interference.

A LM-3C Successfully Launches a Communications Technology Test Satellite 3

A LM-3C carrier rocket at 0:53 Beijing time on December 25 was launched from the Xichang Satellite Launch Center,putting the Communications Technology Test Satellite 3 into its orbit.The satellite was developed by SAST for demonstrating related technologies.

China Launches Its First High-Throughput Communications Satellite

China launched the SJ-13(ChinaSat-16)satellite at 7:04 p.m.on April12 on a LM-3B carrier rocket from the Xichang Satellite Launch Center.The satellite was developed by the China Academy of Space Technology(CAST)with a design lifetime of 15 years.SJ-13,China’s first high-throughput communications satellite that applies electric propulsion technology,is the first satellite based on the DFH-4S platform and will conduct high speed laser communications tests for the first time in China.

LM-3B Successfully Launched Communications Technology Test Satellite 2

At 23:18 Beijing time on January 5,a LM-3B carrier rocket lifted off from the Xichang Satellite Launch Center,sending a communication technology test satellite into its preset orbit.This successful launch was a good start for China’s launch missions in 2017.The Communications Technology Test Satellite 2 was developed by the Shanghai Academy of Spaceflight Technology.It is a next-generation telecom-

China Launches Communications Satellite Alcomsat-1 for Algeria

China launched Algeria’s communications satellite,Alcomsat-1,on a LM-3B carrier rocket into its preset orbit from the Xichang Satellite Launch Center at 00：40 Beijing time on December 11 successfully.Alcomsat-1 is Algeria’s first communications satellite as well as the first cooperative project in the aerospace industry between China and Algeria.

Robust Attitude Control for Reusable Launch Vehicles Based on Fractional Calculus and Pigeon-inspired Optimization

In this paper, a robust attitude control system based on fractional order sliding mode control and dynamic inversion approach is presented for the reusable launch vehicle RLV during the reentry phase. By introducing the fractional order sliding surface to replace the integer order one, we design robust outer loop controller to compensate the error introduced by inner loop controller designed by dynamic inversion approach. To take the uncertainties of aerodynamic parameters into account, stochastic robustness design approach based on the Monte Carlo simulation and Pigeon-inspired optimization is established to increase the robustness of the controller. Some simulation results are given out which indicate the reliability and effectiveness of the attitude control system. © 2014 Chinese Association of Automation.

一类活动发射平台驱动控制系统网络设计

In order to ensure that a mobile launch platform is able to transport a launch vehicle which is assembled vertically on a complex orbit,a communication network for the drive control system was designed.Based on the char-acteristics of equipment of the drive control system and its position,Industrial Ethernet and Profibus were selected.To meet the requirements for reliability and maintainability of aerospace products,the communication network featured a hot redundant to avoid single point failure risk,so that if any point in the system fails,the control strategy of standby switches using heartbeat detection and parity check would ensure the normal communication and failure diagnostics,which could enable the transport mission of the launch vehicle to be completed smoothly.

China's Space Instrumentation Ship,Yuan Wang

The ocean-going instrumentations-Yuan Wang,are an important part of the space TT&C networks in China.They have successfully completed 11 missions in the past 20 years.The tasks of these ships are to track and measure the flight path data of spacecraft and launch rockets,receive the remote information,transmit the command as well as communicate with and rescue the astronauts reentrying and splashing down over the sea in the futureThe detail characteristics of the Yuan Wang’s structure,the main components,durability,adaptability and stability in various conditions are given in this paper.The shipboard high precision TT&.C equipments include the 180 Monopulse Radar,the 450-3 Remote Telemetry System and the 718 Laser Position Indicator,and their basic compositions and functions are also given.The technical measures to be taken to support the TT&C system are discussed here.

CASC Issues Commercial Space Program

During the following 3 years,China Aerospace Science and Technology Corporation (CASC) will implement commercial practices in launch services,in the areas of communications,navigation and remote sensing satellites,as well focusing on promoting commercial launch services and satellite applications for global low orbit satellite mobile communications,space internet systems and SuperView-I commercial remote sensing satellite constellation consolidating the overall in-depth development of CASC's commercial space capabilities.