A 3D Synchronous Positioning Receiver for Underwater Targets Based on Frequency-Hopping Three-Pulse Coding

Abstract

The present invention belongs to the underwater motion target three-dimensional positioning technology field, and especially relates to an underwater target three-dimensional synchronization positioning receiver based on frequency hopping triple pulse coding. The receiver comprises a broadband receiving transducer configured to convert the received triple pulse coding signals emitted by a located target to electric signals and output the electric signals to a conditioning collection circuit; the conditioning collection circuit configured to perform amplification, filtering, gain control and analog-digital conversion of the electric signals, concretely, the electric signals outputted by the broadband receiving transducer are divided into two-way signals for following receiving processing after the pre-amplifying and band-pass filtering processing, and one-way signals are outputted to a preamble pulse receiver after the narrow-band filtering and the analog-digital conversion. The underwater target three-dimensional synchronization positioning receiver based on frequency hopping triple pulse coding has the advantages of gain self regulation, Doppler self correction, high processing gain, big output time delay information redundancy and the like so as to ensure the high detection probability and high time delay estimation precision of the receiver and ensure that the output redundancy time delay information has performances of resolving range ambiguity by software and multipath resistance.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional positioning of underwater moving targets, and in particular relates to a three-dimensional synchronous positioning receiver for underwater targets based on frequency-hopping three-pulse coding. Background technique [0002] The commonly used underwater moving target positioning technology is to determine the detection baseline (receiving base array) base line (receiving base array) of the measured target by detecting the time delay experienced by the transponder installed on the underwater moving target from transmitting the acoustic signal to receiving. The distance between the elements, so as to realize the precise positioning of the underwater moving target. According to different detection principles, underwater target positioning technology is divided into two working modes: synchronous one-way ranging positioning and asynchronous two-way ranging positioning. In the two-way ranging...

AI Technical Summary

Problems solved by technology

[0003] At the same time, due to the small aperture of the positioning baseline in the depth direction, the depth detection accuracy is very low. Although it can be solved by changing the distance difference between the baseline primitives in the depth direction, it is difficult to obtain an effective solution especially in the shallow water detection environment. improvement, and even in deepwater applications this approach can lead to a dramatic increase in system complexity

In addition, the underwater channel is more complicated than the air channel, especially in the small space water area, the multi-path effect is very serious, and the moving target will also introduce the Doppler effect. If this effect cannot be eliminated, it will also affect the processing performance of the receiver. Problems that need to be faced in the detection field

Therefore, no matter which working method is used, the underwater moving target positioning technology has problems such as range ambiguity limiting the detection range, low depth detection accuracy, and serious multi-channel interference caused by complex channels, which affect the performance of the 3D positioning system. The research on target positioning technology has been paying attention to and working hard to solve the problems from birth to the present and into the future

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