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Mega-Constellations Based TT&C Resource Sharing: Keep Reliable Aeronautical Communication in an Emergency

China Communications 2024年第2期21卷 1-16页

作者： Haoran Xie yafeng zhan {2. lu department of electronic {2. Tsinghua UniversityBeijing 100084China beijing National Research Center for Information Science and Technology Tsinghua UniversityBeijing 100084China

With the development of the transportation industry, the effective guidance of aircraft in an emergency to prevent catastrophic accidents remains one of the top safety concerns. Undoubtedly, operational status data of the aircraft play an important role in the judgment and command of the Operational Control Center(OCC). However, how to transmit various operational status data from abnormal aircraft back to the OCC in an emergency is still an open problem. In this paper, we propose a novel Telemetry, Tracking,and Command(TT&C) architecture named Collaborative TT&C(CoTT&C) based on mega-constellation to solve such a problem. CoTT&C allows each satellite to help the abnormal aircraft by sharing TT&C resources when needed, realizing real-time and reliable aeronautical communication in an emergency. Specifically, we design a dynamic resource sharing mechanism for CoTT&C and model the mechanism as a single-leader-multi-follower Stackelberg game. Further, we give an unique Nash Equilibrium(NE) of the game as a closed form. Simulation results demonstrate that the proposed resource sharing mechanism is effective, incentive compatible, fair, and reciprocal. We hope that our findings can shed some light for future research on aeronautical communications in an emergency.

关键词： aeronautical emergency communication mega-constellation networked TT&C resource allocation stackelberg game

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A High Data-Rate Software Defined Radio Receiver Suited for FPGA Platforms

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China Communications 2009年第1期6卷 73-77页

作者： chen zhijun {2. yafeng lu jianhua department of electronic {2. Tsinghua University Beijing China

Although Alternate Parallel Receiver (APRX) could effectively improve the maximum demodulating rate of the receiver, its frequency domain processing module consumes a large amount of multiplication units when the number of parallel input channels is large, making it unsuitable for use on FPGA software defi ned radio platforms. This paper proposes an optimization scheme by introducing partitioned convolution and exploring the spectrum characteristic of the APRX input data, reducing the usage of multipliers greatly. After the optimization, the number of real multipliers used in the frequency-domain processing module of the 16-ary APRX is reduced from about 576 to 68, with little performance loss. This optimized APRX is fairly suitable for FPGA software defi ned radio platform applications.

关键词： FPGA APRX optimization partitioned convolution

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A High Data-Rate Software Defined Radio Receiver Suited for FPGA Platforms

A High Data-Rate Software Defined Radio Receiver Suited for ...

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The First International Workshop on Software Radio Technology

作者： zhijun chen,yafeng zhan and jianhua lu department of electronic engineering,{2.,beijing,China

Although Alternate Parallel Receiver(APRX)could effectively improve the maximum demodulating rate of the receiver,its frequency domain processing module consumes a large amount of multiplication units when the number of parallel input channels is large,making it unsuitable for use on FPGA software defined radio *** paper proposes an optimization scheme by introducing partitioned convolution and exploring the spectrum characteristic of the APRX input data,reducing the usage of multipliers greatly with no throughput *** the optimization,the number of real multipliers used in the frequency-domain processing module of the 16-ary APRX is reduced from about 576 to 68,with little performance *** optimized APRX is fairly suitable for FPGA software defined radio platform applications.

关键词： FPGA APRX optimization partitioned convolution

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A NEW ALGORITHM FOR MAIN CARRIER ACQUISITION IN DEEP SPACE COMMUNICATIONS

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Journal of electronics(China) 2011年第2期28卷 169-173页

作者： zhang Ruyuan zhan {2. lu jianhua department of electronic {2. Tsinghua University Beijing 100084 China Space Center Tsinghua University Beijing 100084 China

Compared with common near space satellite Telemetry,Telecommand,and Communication(TT&C),deep space TT&C presents a more challenging environment such as long distance,very low Signal to Noise Ratio(SNR).How to acquire main carrier exactly becomes a hot focus for deep space *** there emerged some main carrier acquisition algorithms,but they all require high SNR and small modulation *** this paper,we develop a new acquire *** we use the spectral energy center algorithm to shorten the original sequence,filter out some noise and make the spectral more *** we adopt the spectral symmetry algorithm to make full use of the whole spectrum information,and utilize FFT to reduce computation *** results show that our algorithm can acquire main carrier successfully under large modulation index and get good performance with low Carrier to Noise Ratio(CNR).

关键词： Deep space Telemetry Telecommand and Communication(TT&C) Main carrier acqui-sition Low Carrier to Noise Ratio(CNR) Modulation index

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