BPSK space optical communication receiving and demodulating system
A space optical communication and demodulation system technology, which is applied in the field of BPSK space optical communication receiving and demodulating systems, can solve problems such as the decline of receiving sensitivity, and achieve the effects of simple structure, high communication rate, and strong anti-interference
Inactive Publication Date: 2016-12-07
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology
The optical field mismatch will eventually lead to the decline of receiving sensitivity, which is a factor that must be considered in the overall research of satellite coherent optical communication links and receiver hardware research.
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Embodiment 1
[0025] Such as figure 1 As shown, the BPSK spatial optical communication receiving demodulation system of this embodiment includes an optical modulator 1, an optical mixer 2, a balance detector 3, a phase detection circuit 4, a fine tracking phase-locked loop 5 and a frequency coarse adjustment circuit 6 .
[0026] The optical mixer 2 in this embodiment is used to mix the received signal and the local oscillator laser signal to form four signals, and the optical modulator 1 is connected to the optical mixer 2 . The local oscillator laser signal here refers to the constant-amplitude wave generated by the laser 67 .
[0027] The balanced detector 3 in this embodiment is connected to the optical mixer 2, and is used to convert the four-way signals formed by the optical mixer 2 into the first electrical signal I and the second electrical signal I which are orthogonal to each other. Signal Q.
[0028] The phase detection circuit 4 in this embodiment is connected to the balance d...
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The invention provides a BPSK space optical communication receiving and demodulating system. In satellite coherent optical communication, dynamic characteristics and channel characteristics of communication links, and space optical interfaces of internal components of a terminal are all sources of mismatching of an optical field. The mismatching of the optical field finally leads to a lower receiving sensitivity, which is a factor that must be considered in general researches of satellite coherent optical communication links and researches of receiver hardware. The BPSK space optical communication receiving and demodulating system is characterized by comprising an optical modulator, an optical mixer, a balance detector, a phase discriminator, a fine tracking phase lock loop, and a frequency coarse tuning circuit. The system provided by the invention has the advantages of high simplicity in structure, high reasonability in design, high communication rate and high anti-interference capability.
Description
technical field [0001] The invention relates to a BPSK space optical communication receiving demodulation system, which belongs to the technical field of communication. Background technique [0002] Laser has the characteristics of high coherence and high frequency. Therefore, compared with microwave communication, laser communication has the advantages of large bandwidth and high data transmission rate. Laser communication has a communication capability of up to hundreds of Gbps, which meets the needs of future massive space information transmission. In addition, the use of laser as the transmission medium to establish a communication link also has a small divergence angle, is not easy to be intercepted, high confidentiality, small beam energy dispersion, and can carry out effective transmission over long distances. The communication terminal is small in size and light in weight , low power consumption and other advantages, it is very suitable as a satellite communication ...
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Login to View More IPC IPC(8): H04B10/11H04B10/61
CPCH04B10/11H04B10/612H04B10/65
Inventor 赵爽陈磊佟首峰李兴广周杨常帅
Owner CHANGCHUN UNIV OF SCI & TECH