A two-way communication ranging method based on normal temperature single photon detector

By designing a dedicated frame structure and a cascaded time slot synchronization method, combined with matched filtering and maximum likelihood estimation algorithms, the problem of balancing communication rate and ranging accuracy in room-temperature single-photon detectors was solved. This achieved efficient communication and ranging integration, improved ranging accuracy and system stability, and is suitable for inter-satellite and underwater communication.

CN122372093APending Publication Date: 2026-07-10SHANGHAI INSTITUTE OF TECHNICAL PHYSICS CHINESE ACADEMY OF SCIENCES
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI INSTITUTE OF TECHNICAL PHYSICS CHINESE ACADEMY OF SCIENCES
Filing Date
2026-03-25
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

In existing communication and ranging integrated technologies based on room-temperature single-photon detectors, it is difficult to efficiently balance communication rate and ranging performance, resulting in insufficient detection sensitivity. The frame rate is strongly correlated with the communication bit error rate, and the coordinated optimization of frame ratio, detection sensitivity and frame rate has not been achieved, leading to bottlenecks in improving communication rate and ranging accuracy.

Method used

A dedicated frame structure design is adopted, combined with serial concatenated pulse position modulation coding and bidirectional asynchronous response mechanism. Through the cascaded architecture of matched filtering coarse synchronization and maximum likelihood estimation algorithm, efficient integration of communication and ranging is achieved, and the time slot synchronization accuracy is improved. A dedicated frame structure containing frame synchronization header, time information and communication data is designed to control the proportion of ranging frames. A coarse and fine concatenated time slot synchronization method is adopted. First, the time slot clock is restored by matched filtering, and then the residual time slot offset is compensated by the maximum likelihood estimation algorithm.

Benefits of technology

It achieves efficient integration of communication and ranging functions, significantly improves time slot synchronization accuracy, adapts to miniaturized and low-power application scenarios, meets the needs of inter-satellite links, uplinks and underwater communication, and improves ranging accuracy and system stability.

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Abstract

This invention discloses a bidirectional communication ranging method based on a room-temperature single-photon detector, belonging to the field of laser communication and ranging technology. The method employs a serial concatenated pulse position modulation coding and bidirectional asynchronous response ranging mechanism, designing a dedicated frame structure including a frame synchronization header, time information, and communication data. The proportion of ranging frames is controlled within the communication bandwidth, achieving integrated communication and ranging functions. At the receiving end, a coarse-fine concatenated time slot synchronization method is used: first, coarse synchronization is achieved by recovering the time slot clock through matched filtering; then, fine synchronization is achieved by compensating for residual time slot offsets based on a maximum likelihood estimation algorithm, significantly improving time slot synchronization accuracy. This invention, operating under room-temperature single-photon detector conditions, eliminates the need for cryogenic cooling equipment, effectively solving the problem of balancing communication rate and ranging accuracy. It significantly improves ranging accuracy and system stability, and is suitable for scenarios sensitive to size and power consumption, such as inter-satellite links and underwater communication.
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