Method for correcting errors of towed sonar system by utilizing neighbor interference

A towed sonar system technology, applied to radio wave measurement systems, instruments, etc., can solve the problems of lack of measurement and correction means, large error of towed sonar system, etc., to improve detection accuracy, strong applicability, simple and convenient operation Effect

Active Publication Date: 2020-11-03

CHINA SHIP DEV & DESIGN CENT

5 Cites 0 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention proposes a method for correcting the system error of the towed sonar by using friendly neighbor interference, which is used to ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Method used

The present invention utilizes friendly neighbor fixed installation sound source to transmit interference, builds one's own side fixed installation receiving base array and towed sonar line array double receiving channel, the direct wave signal that receives is carried out filter processing, utilizes correction mathematical model, to The system error correction of one's own towed sonar can be implemented before the start of the detection mission, with few practical ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Abstract

The invention discloses a method for correcting errors of a towed sonar system by using neighbor interference, which belongs to the field of overall integrated design and comprises the following stepsof: after reaching a preset sea area, constructing a transceiving dual-channel by using a fixed sound source on a neighbor naval vessel as an interference emission source and using own towed sonar tobe corrected and hull sonar as receiving ends; simultaneously acquiring a series of target information sequences are through transceiving dual channels, a warship hull sonar and a towing sonar by using pulse signals emitted by a neighbor warship in all directions; performing data arrangement and smoothing processing on the target information sequence to obtain an interference azimuth informationsequence after arrangement and smoothing processing; solving a conversion coordinate parameter according to the geometrical relationship among the warship shell sonar, the warship dragging sonar, theneighbor warship and the conversion projection; and obtaining a towed sonar direction-finding and distance-measuring converted value under the real target by adopting the statistical value of the converted coordinate parameter. System error correction of towed sonar of different water surface platforms can be supported.

Application Domain

Wave based measurement systems

Technology Topic

Integrated designHull +3

Image

Examples

Experimental program(1)

Example Embodiment

[0039] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] The present invention uses fixed installation sound sources to emit interference to construct one’s own fixed installation receiving base array and towed sonar line array dual receiving channels, performs filtering processing on the received direct wave signals, and uses a correction mathematical model to control the own towing sound The system error correction can be implemented before the start of the detection task, with few practical restrictions and strong environmental adaptability.

[0041] Such as figure 1 As shown, a method for correcting system errors of towing sonar by using neighbor interference provided by an embodiment of the present invention includes the following steps:

[0042] S1: After arriving at the reserved sea area, use the fixed sound source on the neighboring ship as the interference emission source, and use the towed sonar to be corrected and the hull sonar as the receiving end to construct the transceiver dual channel;

[0043] Such as figure 2 As shown, in the embodiment of the present invention, before entering the reserved sea area to perform a detection task, a fixed sound source such as a neighboring ship's hull sonar is used as the emission source, and one's towed sonar to be corrected and the hull sonar are used as the receiving end , Construct two transceiver channels, which are defined as channel 1 and channel 2.

[0044] In order to ensure the effectiveness of channel 1 and channel 2, it is necessary to appropriately adjust the motion state of one's own ship to meet the following conditions:

[0045] (a) The receiving beam of the own ship's hull sonar and the transmitting beam of the neighboring ship's hull sonar can communicate with each other, while the neighboring ship is kept within the range of 30゜~150゜ of the own ship's towed sonar sound array;

[0046] (b) Both the own ship and the neighboring ship move at a constant speed and the speed is not more than 18kn and not less than 6kn;

[0047] (c) The own ship is in the far field of the hull sonar of a neighboring ship, and the distance R between the two ships satisfies: R> D 2 /λ, D is the aperture of the emission source matrix, λ is the wavelength corresponding to the emission interference, and the unit is m;

[0048] (d) The neighboring ship's hull sonar uses a short pulse width emission method to emit acoustic signals, and the pulse width τ satisfies: H 1 , H 2 Is the distance between the working depth of the sound arrays of the two ships and the seabed, in m, whichever is greater is H 1 , The smaller is H 2 , C is the speed of sound in seawater, in m/s.

[0049] (2) Utilizing the omnidirectional pulse signals transmitted by neighboring ships, according to a unified time reference, through the transceiver dual-channel, the hull sonar and towed sonar of the ship simultaneously collect a series of target information sequences;

[0050] In the embodiment of the present invention, the pulse signals emitted by the neighboring ships in all directions are used according to a unified time reference (t 0 The starting time of collecting neighboring interference positions for one's own sonar, t i For subsequent acquisition moments), through channel 1 and channel 2, the ship hull sonar and towed sonar simultaneously collect a series of transmitted signals (adjust the appropriate receiving gain to ensure that the reception is not limited), and the received signal Perform energy detection and record the jamming angle information sequence output by the hull sonar as α i , Record the jamming angle information sequence output by the towing sonar as β i , The information sequence of the towed sonar output after the interference angle is converted to the sound center of the hull sonar is recorded as γ i , Where i=1, 2, 3,..., N, N≥50.

[0051] (3) Carry out data sorting on the collected target information sequence, remove the error data to obtain the sorted target information sequence;

[0052] In the embodiment of the present invention, such as image 3 As shown, the neighboring ship is in Y 1 Position launching sound waves, at this time the ship is in J 1 Position; when the sound wave reaches the ship, the ship moves to J 2 Position, when the neighboring ship moves to Y 2. Using the satellite navigation method of the two ships, survey record Y 1 And J 2 The distance information sequence between two points is R i Since only the one-way propagation of sound waves is used, there is no need for sound velocity lag correction.

[0053] The collected target information sequences are sorted according to the 3σ principle, and the data whose primary difference is greater than three times the standard deviation is eliminated from the measurement data, and α is guaranteed i , Β i And γ i The data at the same time is valid at the same time, and the length of the effective data after sorting should not be less than 30. Record the sorted data sequence as α j , Β j , Γ j And R j (j=1, 2, 3,..., M), M≥30.

[0054] (4) Perform data smoothing on the sorted target information sequence to obtain the smoothed interference position information sequence;

[0055] In the embodiment of the present invention, under the condition that the two ships are moving in a straight and uniform speed, the change law of the target azimuth data can basically be described by a quadratic function of time, as shown in equation (1). In this way, the least squares principle is used to fit the data to eliminate random errors caused by ship course drift, fluctuations, etc.

[0056] F j =a'+b'(t j -t 0 )+c'(t j -t 0 ) 2 (1)

[0057] Where t 0 The starting time of collecting neighboring interference positions for one's own sonar; t j It is the time when one's own sonar collects the neighboring interference position (j=1, 2, 3,..., M); F j Is the interference azimuth corresponding to the collection time (j=1, 2, 3,..., M); a', b', c'are three undetermined coefficients, and the following linear equations can be established according to the principle of least squares Solution:

[0058]

[0059] Let F j Respectively α j , Β j , Γ j , The three groups a', b', c'can be calculated according to the above formula, and the three sets of coefficients can be substituted into the three groups of coefficients, and then the interference azimuth information sequence corresponding to the acquisition time can be calculated according to formula (1) with

[0060] (5) Based on the jamming azimuth information sequence, the converted coordinate parameters are solved according to the geometric relationship between the own-ship hull sonar, the own-ship towed sonar, neighboring ships and the converted projection;

[0061] In the embodiment of the present invention, such as Figure 4 As shown, according to the geometric relationship between the self-ship sonar, the self-ship towed sonar, the neighboring ships and the converted projection, the trigonometric function is solved, and the distance between the towed sonar sound center and the azimuth conversion point is L j And angle correction ξ j.

[0062]

[0063]

[0064] L'is the distance between the sound center of the towed sonar and the converted projection point, the unit is m, j=1, 2, 3,...,M.

[0065] Find the distance L between the sound center of the towed sonar and the azimuth conversion point j , Angle correction ξ j Arithmetic mean with

[0066]

[0067]

[0068] (6) The statistical value of the converted coordinate parameters is used to obtain the converted value of the towed sonar direction finding and ranging under the real target.

[0069] In the embodiment of the present invention, for real targets, such as Figure 5 As shown, the statistical values of the converted coordinate parameters are used to solve the corrected target distance R * And the corrected target azimuth γ *.

[0070]

[0071]

[0072] β is the side angle of the towed sonar measured target, the unit is ゜, b is the distance of the towed sonar measured target, the unit is m, and L is the distance between the towed sonar sound center and the origin of the converted coordinates, the unit is m.

[0073] The present invention proposes a method for correcting system errors of towed sonar by using neighboring interference, which is mainly used to solve the problems of low detection accuracy of towed sonar and weak target indication ability of existing surface platform towing sonar, and supports different surface platform towed sonar System error correction.

[0074] It should be pointed out that according to the needs of implementation, each step/component described in this application can be split into more steps/components, or two or more steps/components or partial operations of steps/components can be combined into new ones. Steps/components to achieve the purpose of the present invention.

[0075] Those skilled in the art can easily understand that the above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present invention, All should be included in the protection scope of the present invention.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Login to view more

PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Login to view more

Classification and recommendation of technical efficacy words

Good correction effect
Improve detection accuracy

Method for correcting errors of towed sonar system by utilizing neighbor interference

A towed sonar system technology, applied to radio wave measurement systems, instruments, etc., can solve the problems of lack of measurement and correction means, large error of towed sonar system, etc., to improve detection accuracy, strong applicability, simple and convenient operation Effect

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

Similar technology patents

Cloth rectifier

Construction method for deviation rectification of open caisson

Method for improving precision of carbonatite dynamic and static Young modulus conversion model

Mini track for opening hand skin of children with syndactylia

Method for eliminating vignetting phenomenon in surgical microimaging

Classification and recommendation of technical efficacy words

Minimal sum decoding method based on grading excursion correction

Projection image correction method and device

Calculation method for theoretical line loss of distribution network considering small power supply

Prone type cervical correcting device

Building steel tube correcting device

Intelligent vision detection system and state detection method of transformer substation device

Unmanned vehicle real-time positioning method based on laser reflection strength

Magnetic sensor

Laser radar apparatus that measures direction and distance of an object

Method and system for post monitoring