单光子激光通信测距一体化系统设计

Design of single-photon laser communication and ranging integration system

超导单光子探测技术能够实现光子量级极微弱光接收,是深空探测的关键技术之一,然而光子概率分布产生的脉冲抖动效应造成通信、测距性能恶化。对此,设计了基于脉冲位置调制(pulse position modulation,PPM)调制的单光子激光通信测距一体化系统。根据光子分布特性,提出了脉冲宽度压缩的PPM新波形,降低了脉冲抖动效应对通信可靠性、测距精度的影响。同时,研制了星载端与地面端原理样机,搭建了双向通信与同步转发测距试验验证平台。试验验证结果表明,同等接收功率(-53.2 dBm)条件下,采用1/4脉宽压缩比时,通信接收误码率从4.7×10^(-4)降至5×10^(-10),测距精度从23.61 cm提高至0.91 cm,实现了高可靠通信传输与高精度距离测量。

Superconducting single photon detection technology can achieve extremely weak light reception at the photon level,which is one of the key technologies for deep space detection to achieve ultra-long distance reception.However,the pulse jitter effect caused by photon probability distribution deteriorates communication and ranging performance.In this paper,we design a single photon laser communication ranging integrated system based on pulse position modulation(PPM)modulation.A novel PPM waveform with compressed pulse width is proposed based on the distribution characteristics of photons,which can reduce the impact of pulse jitter on communication reliability and ranging accuracy.Meanwhile,prototypes of satellite and ground terminals are developed,and a bidirectional communication and synchronous forwarding distance measurement verification platform is built.The experimental verification results demonstrate that under the same receiving power(-53.2 dBm)conditions,when using a 1/4 pulse width compression ratio,the communication reception error rate decreases from 4.7×10^(-4) to 5×10^(-10),and the ranging accuracy increases from 23.61 cm to 0.91 cm,achieving highly reliable communication transmission and high-precision distance measurement.