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Forward sound scattering Doppler frequency shift calculation method for irregular track water moving target

A technology of Doppler frequency shift and calculation method, which is applied in the field of forward acoustic scattering Doppler frequency shift calculation of moving targets in water, can solve the problems of unscattered Doppler frequency shift calculation method, unsuitable for irregular target trajectories, etc. , to achieve the effect of accurate results and rigorous process

Active Publication Date: 2021-08-10
OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of this method is that it is only applicable to the situation where the target trajectory is a straight line, and it is not suitable for the situation of irregular target trajectory
[0010] At present, there is no calculation method for the forward acoustic scattering Doppler frequency shift of targets in water with irregular trajectories

Method used

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  • Forward sound scattering Doppler frequency shift calculation method for irregular track water moving target
  • Forward sound scattering Doppler frequency shift calculation method for irregular track water moving target
  • Forward sound scattering Doppler frequency shift calculation method for irregular track water moving target

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Embodiment 1

[0046] Embodiment 1 The method for calculating the forward acoustic scattering Doppler frequency shift of moving targets in water with irregular trajectories provided by the present invention, the main process is as follows figure 1 As shown, it specifically includes the following steps:

[0047] (1) Target track coordinate transformation

[0048] Select an appropriate reference position in the two-dimensional plane as the origin to establish a Cartesian coordinate system, convert the latitude and longitude coordinates of the transmitter, receiver and target trajectory into Cartesian coordinates, and mark them as (x S ,y S ), (x T ,y T ) and (x R ,y R ), where the baseline length (transmitting and receiving connection length) can be expressed as:

[0049]

[0050] (2) Estimate the target movement speed

[0051] Record the coordinate sequence of the target trajectory as (x T (t i ),y T (t i )), i=1,2,…,N, then the target is at any two adjacent time t i and t i+1...

Embodiment 2

[0082] Embodiment 2 The algorithm of the present invention is verified by using the target track data and the target forward acoustic scattering Doppler frequency shift extraction results of the 2011 Qiandao Lake scaled-scale target forward acoustic scattering detection test.

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Abstract

The invention relates to the technical field of marine acoustics and particularly relates to a forward acoustic scattering Doppler frequency shift calculation method for a moving target in water. The invention relates to a forward sound scattering Doppler frequency shift calculation method for an irregular track water moving target. The method comprises the following steps of (1) converting earth latitude and longitude coordinates of a transmitting end, a target track and a receiving end into rectangular coordinates, and sequentially marking the rectangular coordinates as (xS, yS), (xT, yT) and (xR, yR); (2) recording the coordinate sequence of the target track as (xT (ti), yT (ti)), i = 1, 2,..., N, and calculating the average navigational speed in all time periods; (3) smoothing the target track to obtain a virtual linear track, and respectively calculating the horizontal distance from the target and the receiving end to the intersection point of the virtual linear track and the base line and an included angle between the virtual linear track and the base line; and (4) calculating the forward sound scattering Doppler frequency shift of the target at each moment by using the parameters calculated in the steps (2) and (3). According to the method, a problem that the forward sound scattering Doppler frequency shift cannot be calculated when the target motion trail is irregular in the prior art is solved.

Description

technical field [0001] The invention relates to the technical field of marine acoustics, in particular to a calculation method for forward acoustic scattering Doppler frequency shift of a moving target in water. Background technique [0002] In the forward acoustic scattering detection system, since the positions of the transmitting end and the receiving end are fixed and only the target moves, the Doppler frequency shift of the direct wave is zero while the target has a time-varying Doppler frequency shift. The forward scattering Doppler frequency shift information of the target is extracted from the received acoustic signal, and the moving target in the water that invades the transceiver line can be detected. However, the authenticity and accuracy of the target forward scatter Doppler frequency shift extraction results need to be compared with the corresponding theoretical calculation results. [0003] There are two theoretical calculation methods for the forward acoustic...

Claims

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Application Information

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IPC IPC(8): G01S7/539
CPCG01S7/539
Inventor 何传林于洋孙守扬马健博吕红敏
Owner OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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