Integration method for high-speed laser communication method and high-precision laser ranging

Abstract

The invention discloses an integration method for high-speed laser communication and high-precision ranging. A ranging technology is integrated in a laser communication system, a ranging code with uniqueness, good self-correlation and cross-correlation properties is embedded into communication data, and is transmitted in series with the communication data after coding to achieve high-speed communication; and the received ranging code and a local ranging code are subjected to correlation operation at a receiving end to obtain a rough measurement time value of a code element width of integer multiples, and meanwhile, an accurate measurement time value in a code element of the ranging code is computed by virtue of a phase difference between a local clock and a receive recovery clock, thereby achieving integration of high-speed laser communication and high-precision ranging. The integration method disclosed by the invention adopts bidirectional single-way communication to accomplish time frequency transmission of clocks while ranging; and the integrated method disclosed by the invention can achieve high-speed laser communication and high-precision ranging without high-speed A/D conversion.

Description

technical field [0001] The invention relates to the field of laser communication and ranging in free space, in particular to a method for integrating high-speed laser communication and high-precision laser ranging. Background technique [0002] Laser communication has the advantages of large capacity, strong anti-interference, good confidentiality, low power consumption, small size, etc., and can solve the high-speed bottleneck of microwave communication. It is an effective way to transmit massive and ultra-high-speed data between satellites and between satellites and ground. The integrated technology of laser communication and ranging can enable the aircraft to complete multiple tasks under the same load, thereby reducing the requirements for volume and power consumption, and improving the cost performance of the system. [0003] Existing technology [1] (Chengdu Aerospace Communication Equipment Co., Ltd. Coherent pseudo-code ranging method based on MSK spread spectrum mod...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an integrated method of high-speed laser communication and high-precision laser ranging, which combines the characteristics of large laser communication capacity, low power consumption and pseudo-code with good autocorrelation and cross-correlation and low interception characteristics. , aiming at the shortcomings of traditional pseudo-code ranging that cannot achieve high-speed communication and requires too high sampling rate of the processing chip, it is proposed to embed the ranging code into the communication data, so that the ranging code and communication data are transmitted serially, so as to achieve high-speed communication. Communication; at the receiving end, the phase comparison between the recovered clock signal and the local clock signal can achieve precise measurement within one ranging symbol

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