Method for real-time simulation of unstable target motion trail based on B spline fitting

A motion trajectory and spline fitting technology, applied in the field of signal processing, can solve problems such as single motion mode, limited smooth motion, and inability to simulate non-stationary target motion trajectory

Active Publication Date: 2014-07-09
SOUTHEAST UNIV
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Problems solved by technology

However, these typical motion modes are limited to smooth motion, single motion mode, and cannot simulate non-stationary target motion trajectories.

Method used

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  • Method for real-time simulation of unstable target motion trail based on B spline fitting
  • Method for real-time simulation of unstable target motion trail based on B spline fitting
  • Method for real-time simulation of unstable target motion trail based on B spline fitting

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Embodiment 1

[0077] Existing sampling rate f s =10Hz to simulate a trajectory of a target movement, the length of the trajectory sequence is 6, the target first makes a linear acceleration motion along the 45° direction, and then changes the motion direction and makes a linear acceleration motion along the 270° direction, such as figure 2 shown. In addition, the sampling rate of the target trajectory to be fitted is F s = 6KHz.

[0078] First, simplify f s / F s It is the simplest molecular formula, the numerator of the simplest formula is 1, then select M=16 according to the method introduced in the second step, then the actual measured underwater acoustic target motion track sequence m(i) is intercepted by length M=16, and the first section is taken as The motion trajectory of the 1st to 16th sampling points, the second segment takes the motion trajectory of the 16th to 31st sampling points, and intercepts in sequence, the length of the last sequence is 6.

[0079] Then, the boundar...

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Abstract

The invention discloses a method for real-time simulation of an unstable target motion trail based on B spline fitting. The method for real-time simulation includes the following steps that firstly, an actual measurement underwater sound target motion trail sequence m(n) with the sampling rate being fs is acquired; secondly, actual measurement underwater sound target motion trail sub-sequences are acquired; thirdly, control vertexes for reverse determination of a three-time B spline curve by all the sub-sequences are acquired; fourthly, target motion trails of the sub-sequences in the sampling rate fs are acquired; fifthly, the real-time target motion trails are acquired. According to the method for real-time simulation, curve fitting is conducted on target motion trail data in the actual measurement sampling rate fs through a mathematical method that a smooth parameter curve section approaches a polyline polygon, the target motion trails in the sampling rate fs are simulated, and then the motion trails in which inflection points are probably generated due to the change of a target motion state are smoother.

Description

technical field [0001] The invention belongs to the field of signal processing, and in particular relates to a B-spline fitting-based real-time simulation method for a motion track of a non-stationary target. Background technique [0002] There are many types of underwater acoustic targets, and the common ones are: surface fishing boats, ships, torpedoes, decoys, and submarines. Different underwater acoustic targets have different motion trajectories, and the speed of the same target in different environments is also different. Most of the traditional hydroacoustic target motion track simulations are simulations of typical motion modes, such as: straight-line route, circular (arc) route and serpentine pursuit route. Among them, the straight-line route is the most common way for torpedoes to attack the target; the circular (arc) route is one of the main ways for the target to align its track, and its main feature is that the target moves in a circular arc with equal radius i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00G05B17/02
Inventor 方世良徐雅南罗昕炜
Owner SOUTHEAST UNIV
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