Polarity diversity reception device and method based on SOQPSK-TG signal

Abstract

The invention discloses a polarity diversity reception method based on an SOQPSK-TG signal. The method comprises the following steps: adopting two ADCs to transfer a received levogyration polarity signal and a received dextrorotation polarity signal into digital signals respectively; adopting an automatic gain control loop to enable the two digital signals to be constant in amplitude or in a threshold value section; tracking frequency difference and phase difference of the two gained digital signals through a difference module loop to fulfill same frequency and phase locking of the two digital signals; adopting maximal-ratio combining to obtain average SNR gain; tracking Doppler frequency shift to conduct carrier recovery; conducting position timing clock recovery; tracking clock phase shift and frequency shift between a receiver and a transmitter. The invention further discloses an SOQPSK-TG signal modulation and polarity diversity reception device based on FPGA. The modulation and reception device utilizes the characteristics of constant envelope and high spectral efficiency of the SOQPSK-TG to meet modern satellite communication demand; the polarity diversity reception technology is introduced to avoid deep zero point influence; system performance is improved.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to an FPGA-based SOQPSK-TG signal polarization diversity receiving device and method thereof. Background technique [0002] The channel of the satellite communication system has the characteristics of limited power and bandwidth and non-linearity, so it is necessary to use a modulation method with high bandwidth efficiency as much as possible while ensuring sufficient power (see "Beidas B F, Cioni S, De Bie U, et al. Continuous phase modulation for broadband satellite communications: design and trade-offs [J]. International Journal of Satellite Communications and Networking, 2013, 31(5): 249-262" and "Maral G, Bousquet M. Satellite communications systems: systems, techniques and technology [M]. 5th edition. California: John Wiley & Sons, 2011"). [0003] Traditional BPSK (Binary Phase Shift Keying, binary phase shift keying), QPSK (Quadrature Phase Shift Keying, qua...

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Problems solved by technology

For example, dual-loop phase-locked and triple-loop phase-locked polarization diversity reception technology based on FM modulation (see "Jiang Dong. A new type of dual-loop phase-locked polarization diversity receiver [J]. Telemetry and Remote Control, 1995, 16(5): 52- 65" and "Xue Sanbao. A Practical Polarization Diversity Receiving Scheme[J]. Telecommunications Technology, 1996,36(4):1-4"), due to the use of an analog phase-locked loop, the stability and reliability Poor; BPSK-based digital double-loop phase-locked polarization diversity reception (see "Chen Zhu. Research on Digital Diversity Receiver [D]. Chongqing University, 2006"), its spectrum characteristics are not good, and it can no longer meet the requireme

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