Design of Transceiver Integrated System for Inter-satellite Link Communication
With the reduction of satellite manufacturing and launch costs and the increase in global communication needs,the low-orbit inter-satellite link technology has become a research hotspot.Inter-satellite link can interconnect multiple satellites to establish an autonomous operating system with navigation and communication functions,the reliable communication technology is currently a research focus.In order to meet the requirements of high dynamic environments with large Doppler frequency shift in outer space,an integrated inter-satellite link communication transceiver system is designed.The transmitter uses unbalanced quadrature phase shift keying(UQPSK)direct sequence spread spectrum technology,the dual-channel architecture can simultaneously complete the trans-mission of navigation and communication data at different rates,and then applies the low density parity check code(LDPC)encoding technology to improve the data transmission rate and stability;The receiving end uses an improved partial match filter-fast fourier transform(PMF-FFT)segmented acquisition algorithm and normalized minimum and LDPC decoding algorithm to quickly and accu-rately capture the inter-satellite information.After many tests on the FPGA hardware platform,the system can accurately and quickly capture signals with Doppler frequency shift up to±341 kHz in highly dynamic environments.The capture time of the algorithm can be kept within 200 ms,which meets the performance requirements in practical applications.
inter-satellite linkunbalanced quadrature phase shift keying and direct sequence spread spectrum(UQPSK-DSSS)PMF-FFTLDPCFPGA
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