Noncoherent distance measurement/time synchronism system of cluster link two-way asynchronous communication channel

Abstract

The invention relates to a symmetrical noncoherent distance measurement / time synchronism system of a cluster link two-way asynchronous communication channel, belonging to the autonomous technical field of aviation data links, radio navigation and aircrafts. By the invention, a symmetrical noncoherent distance measurement / time synchronism method and a system framework can be realized on a DSP (Digital Signal Processor) of a circuit board and an FPGA (Field Programmable Gate Array). Based on the two-way asynchronous communication link between cluster link member nodes, the noncoherent distance measurement / time synchronism system provides a noncoherent spread spectrum distance measurement principle of a two-way asynchronous communication frame under a comprehensive channel system, constructs a noncoherent spread spectrum distance measurement algorithm structure of the air fleet link two-way asynchronous communication frame in a uniform form by adopting a communication frame based on CCSDS Proximity-1 version-3 and provides two algorithms of base line measurement and time synchronism measurement control: an interprocessor time synchronism recursive algorithm and a Doppler integral compensation algorithm. The invention overcomes the defects of the traditional coherent transferring distance measurement and the two-way synchronous noncoherent distance measurement and provides a distance measurement scheme, in which both parts of the two-way asynchronous communication distance measurement can equally acquire a measurement result.

Description

technical field [0001] The invention relates to a non-coherent ranging / time synchronization system of a two-way asynchronous communication channel of a cluster link, belonging to the technical fields of aviation data link, radio navigation and aircraft autonomy. Background technique [0002] At present, the ranging system can be generally classified into two systems: the traditional coherent forwarding ranging system; the two-way synchronous channel non-coherent ranging system. [0003] The first system is that the ranging terminal sends a ranging signal to the transponder, and the transponder forwards the ranging signal to the ranging terminal through a frequency conversion forwarding link (ie: coherent forwarding) after receiving the signal. This method is widely used in the aerospace field Only the ranging terminal can obtain the ranging results, and the Doppler frequency shift effect is multiplied through the forwarding process when the radial relative speed of the two p...

AI Technical Summary

Problems solved by technology

In practical applications, the information transmission bandwidth (symbol rate) of most ranging parties is different, that is, the forward link and the return link of the communication / ranging parties are asynchronous channels, so this ranging system cannot be applied to Most application fields; this ranging system requires high-precision frequency standards for both sides of the ranging; in addition, when the ranging terminal has relative motion, the measurement timing is not synchronized, which will cause a large ranging error

These three problems have not been well resolved

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