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Microwave power transmission served as the core technology of the Space Solar Power Satellite (SSPS) was studied. The rectifying surface was researched based on the concept of perfectly matched layer to solve the problem that beam collection efficiency would decline with distance away from transmitting antenna because of the spread of beam, by changing perfectly matched layer structure conjugate match between antenna output impedance and rectifier circuit input impedance. The rectifying surface exhibits a strong restrain to high-order harmonics, without the need of RF filter which is an important element for the traditional rectenna, so the circuit structure is simple and high conversion efficiency energy can be realized. And under the proposed limit for the center-of-beam power density to assure environmental health and safety for microwave transmission, an experimental system with solid power amplifier at 5. 8 GHz was constructed and tested, and the maximum conversion efficiency is 57.7%. The experiment results show that the designed microwave power transmission system is benefit for ground demonstration testing in miniature version and building of SSPS in future. [ABSTRACT FROM AUTHOR]

In this paper, the aerodynamic characteristics and control strategy design method of the HTV-2 like vehicle are studied when the lateral control deviation parameter (LCDP) is greater than 0. Considering the characteristics of the HTV-2 space vehicle lateral static stability easy to obtain, the design method of the aerodynamic characteristics and control strategy is proposed by using the lateral/directional channel coupling. The analysis shows that the method can be used to design the aerodynamic characteristics and the control strategy to realize the stability of the system with LCDP greater than 0. [ABSTRACT FROM AUTHOR]

The SEU detectors on some MEO and IGSO satellites are used to detect the single event upset (SEU) of the configuration memory of XQR2V3000 FPGA. The method based on the statistical number of reset to detect SEU is introduced. The statistical number of SEU of the configuration memory of the two MEO satellites and an IGSO satellite are given during the quiet periods of the solar activity in 2016 and during the solar flares burst on September 6，2017. The spatial distribution of SEU is got according to the orbital elements. The results show that，in the quiet periods of the solar activity，the equivalent aluminum shielding thickness of the equipment is 6mm，the SEU rates of the configuration memory of FPGA in MEO and IGSO are respectively 0. 513 upsets/(device • d) and 0.491 upsets/(device • d)，about 22.4% of the prediction in MEO orbit and 16.9% of the prediction in IGSO orbit based on the CREME96 model, and the SEU rates of the two orbits are equivalent. During the solar flare eruption, the SEU rates of the configuration memory of FPGA in MEO and IGSO rise to 2. 5 upsets/(device • d) and 5 upsets/(device • d) respectively. The SEU rate can provide an effective reference for the prediction of SEU rate of the satellite electronic equipment in the same orbit. [ABSTRACT FROM AUTHOR]

Microwave power transmission (MPT) is one of the key technologies in Space Solar Power Station (SSPS). The state-of-the-art researches and validations only focus on individual technology but lack of comprehensive optimization for SSPS system. According to the operating mode of SSPS, a demonstration system was proposed to validate microwave power transmission in SSPS. The transmitting antenna array and rectenna array were designed by using integrated processing with approximate Gaussian field distribution in transmitting antenna array and low reflection design in rectenna array. The beam control method in the system was based on direction of arrival estimation by sending pilot signal and beam synthesis by controlling the phase shifters in the transmitting antenna array. The analyzed beam collecting efficiency of demonstration system is 94.2%, about 17.6% higher than the traditional uniform distribution system. The demonstration system comprehensively simulates the MPT of SSPS in several ways, including system scale minification, transmitting antenna field distribution, etc., power density and beam controlling and it can be the promotion of SSPS development. [ABSTRACT FROM AUTHOR]