Non-coherent ranging method for UAV measurement and control data link

Abstract

The invention provides a noncoherent range finding method for a data link in measurement and control of an unmanned aerial vehicle, and aims to provide a range finding method which realizes simple and accurate measurement process and requires iterative equalization and decoding and furthermore can perform zero calibration on a distance. The noncoherent range finding method is realized by comprising the following steps of filling range finding information such as frame label into a current frame by a ground measurement and control station through a frame counter and transmitting the range finding information to a target unmanned aerial vehicle through an uplink in a vehicle-and-ground bidirectional range finding process; inserting the acquired range finding information of a current uplink remote control signal into a current downlink digital transmission data frame by an on-vehicle terminal according to a current downlink frame finishing mark, and returning a digital transmission data frame signal to the ground measurement and control station through a downlink; and generating a current digital transmission data frame pseudocode synchronization mark by the terminal of the ground measurement and control station, delaying a digital transmission data frame information reporting point to a next digital transmission data frame pseudocode synchronization mark, acquiring a ground distance measurement number and obtaining a vehicle-and-ground bidirectional range finding number.

Description

technical field [0001] The invention relates to a non-coherent distance measuring method of a high-speed data link in an unmanned aerial vehicle measurement and control system. Background technique [0002] UAV measurement and control and data link technology involves remote control and telemetry, tracking measurement, image transmission, data communication, satellite communication, automatic control and computer application and other technical disciplines. Integration, an evolving expertise. In UAV measurement and control system, ranging is an important component. At present, the ranging methods used in the UAV measurement and control system mainly include sidetone ranging and pseudo code ranging. The side tone ranging method generally uses multiple ranging tone signals, in which the ranging accuracy of this method is guaranteed by the highest ranging tone, and the unambiguous distance value is guaranteed by the lowest ranging tone. Set several secondary ranging tones to...

AI Technical Summary

Problems solved by technology

The principle of the coherent ranging algorithm is simple, but the strict constraint relationship between the uplink and downlink ranging signals will bring the following three problems: ① The uplink loss of the measurement and control system will directly lead to the downlink loss of lock; When the uplink is a narrowband remote control signal and the downlink is a broadband digital transmission signal, it is difficult to synchronize the downlink signal with the uplink signal; ③Due to the correlation of the uplink and downlink signal parameters, it is necessary to design the system parameters in detail , so it will increase the difficulty of system design

Therefore, the signal processing delay presents obvious dynamic characteristics, and it is impossible to calibrate the signal processing delay with a fixed value through the traditional zero calibration method

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