| Abstract: | In order to realize the acquisition and tracking of non-cooperative inter-satellite target signals, this paper presents a software and hardware design scheme of non-cooperative target intermediate frequency angle tracking receiver based on single-channel monopulse tracking technology. The hardware design combines the advantages of FPGA and DSP in algorithm processing, including high-speed ADC design, system clock link design and so on. In view of the characteristics of the target signals between non-cooperative stars, this paper proposes the detection and identification of non-cooperative broadband data transmission signals with different modulation systems and different code rates, as well as the extraction and separation of angular error signals, including digital preprocessing, digital channelization, channel judgment, signal detection and estimation, angular error signal extraction and other processing links. The system capture and tracking test results show that the non-cooperative target angle tracking receiver can complete the angle error signal extraction and separation of non-cooperative broadband data transmission signals with various modulation systems (BPSK, QPSK, SQPSK and other carrier phase modulation) and different code rates (1kbps ~ 300Mbps), and the accuracy of carrier frequency estimation is better than 100kHz. The accuracy of bit rate estimation is better than 100kbps. This system can effectively track non-cooperative target signal, which lays a solid foundation for the engineering research of non-cooperative target angle tracking receiver. |
