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Active sonar single frequency tracking method

An active sonar and single-frequency technology, applied in the field of sonar signal processing and sonar target tracking, can solve the problems of continuous tracking of single-frequency signals, discontinuous and discontinuous detection of target Doppler information, and achieve High precision, good effect, simple engineering effect

Active Publication Date: 2019-03-08
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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Problems solved by technology

[0003] However, in practical applications, especially in shallow sea conditions, due to the influence of the channel and the environment, the detection of the target single-frequency echo has the characteristics of fluctuation and discontinuity, which brings difficulties to the continuous tracking of the single-frequency signal. Causes discontinuity in the detection of target Doppler information

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Embodiment Construction

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0019] Assume that the active sonar transmit signal is: the center frequency is f 1 =2500Hz, bandwidth is B=500Hz, pulse width is tp 1 = FM signal u of 1.2s 1 and a center frequency of f 2 =2100Hz, pulse width is tp 2 = 0.6s single-frequency signal u 2 . Send the FM signal first, and then send the single-frequency signal. The trace flag bits are initialized to 0. For ease of description, it is assumed that a certain transmission period is the kth time, the previous t...

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Abstract

The invention relates to the field of sonar signal processing, specifically relates to the field of the target tracking of sonar, and mainly discloses an active sonar single frequency tracking method.The combined signal based active sonar single frequency tracking method can be constructed by utilizing the continuously stable and high-precision tracking characteristics of a broadband frequency modulation signal on suspected targets, so that stable, accurate single frequency tracking doppler information output results can be obtained; and the method is simple in engineering implementation andgood in effect.

Description

technical field [0001] The invention relates to the field of sonar signal processing, in particular to the field of sonar target tracking, and mainly relates to an active sonar single-frequency tracking method. Background technique [0002] Generally, active sonar systems can use broadband FM signals and single-frequency combined signals for target detection and tracking. This is mainly due to the high matching correlation of the FM signal, large processing gain, relatively stable target echo, and accurate ranging and lateral direction; at the same time, the single-frequency signal has high Doppler sensitivity, simple implementation, and Doppler speed. The measurements are accurate. [0003] However, in practical applications, especially in shallow sea conditions, due to the influence of the channel and the environment, the detection of the target single-frequency echo has the characteristics of fluctuation and discontinuity, which brings difficulties to the continuous trac...

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Application Information

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IPC IPC(8): G01S15/66
CPCG01S15/66
Inventor 胡鹏冯金鹿李然威
Owner THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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