High-precision arc tangent fitting system and ultrasonic imaging device

An arctangent and high-precision technology, which is applied in measuring devices, radio wave measuring systems, and re-radiation of sound waves, can solve problems such as storage resource consumption, increased computing time, and constraints, and achieve improved computing efficiency, high computing accuracy, and The effect of increased computational complexity

Pending Publication Date: 2021-06-01
聚融医疗科技(杭州)有限公司
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main disadvantage of the CORDIC algorithm is that the calculation accuracy is highly dependent on the number of iterations, and high precision will inevitably lead to an increase in calculation time and consumption of storage resources.
The main disadvantage of the lookup table is that it is difficult to solve the constraint problem between accuracy and efficiency
There are many related studies based on polynomials. References: RajanS, Wang S, Inkol R, et al. However, the calculation accuracy of the methods mentioned in the literature is only 10 -3 , for some scenarios with high precision requirements, this type of method is difficult to meet the performance requirements

Method used

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
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High-precision arc tangent fitting system and ultrasonic imaging device
  • High-precision arc tangent fitting system and ultrasonic imaging device
  • High-precision arc tangent fitting system and ultrasonic imaging device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] refer to figure 1 , the present embodiment provides a high-precision arctangent fitting system, including:

[0038] Lookup table building blocks for building angle lookup tables in nonlinear models;

[0039] A parameter calculation module for calculating nonlinear model parameters;

[0040] The basic coefficient calculation module is used to calculate the basic coefficient;

[0041] The fitting coefficient calculation module is used to calculate the fitting coefficient of the nonlinear model according to the basic coefficient;

[0042] Fitting module for fitting arctangent values ​​based on nonlinear models.

[0043] specific:

[0044] The construction angle lookup table in the described lookup table construction module is specifically: the The tangent value [0, 1] of is divided into two sections equally and an angle lookup table LUT=[0, 0.4636,, 07854] is constructed.

[0045] The calculation nonlinear model parameters in the parameter calculation module are spe...

Embodiment 2

[0063] refer to image 3 , this embodiment provides a high-precision arctangent fitting method, including steps:

[0064] S1, constructing the angle lookup table in the nonlinear model;

[0065] S2. Calculating nonlinear model parameters;

[0066] S3, calculating the basic coefficient;

[0067] S4. Calculate the fitting coefficient of the nonlinear model according to the basic coefficient;

[0068] S5. Fitting the arctangent value based on the nonlinear model.

[0069] specific:

[0070] In step S1, the angle lookup table in the construction of the nonlinear model is specifically: The tangent value [0, 1] of is divided into two sections equally and builds the angle look-up table LUT=[0, 0.4636,, 07854];

[0071] In step S2, the calculation of nonlinear model parameters specifically includes the following steps:

[0072] S2.1. Calculation

[0073] S2.2. Calculate index ind=round(2*x);

[0074] S2.3, calculate t=(2*x-ind) / (2+ind*x);

[0075] Among them, x and t are ...

Embodiment 3

[0090] This embodiment provides a high-precision arctangent ultrasonic imaging device, which is realized based on the high-precision arctangent fitting system in the first embodiment.

[0091] In this embodiment, the specific application of the above-mentioned arctangent fitting method in elastography is described:

[0092] Include the following steps:

[0093] 1. Signal acquisition

[0094] Perform quadrature demodulation on the ultrasonic echo to obtain the input signal x of elastography:

[0095] x=I+j·Q

[0096] In this formula, I is the in-phase component; Q is the quadrature component.

[0097] 2. Cross-correlation calculation

[0098] Calculate the input signal x at two adjacent moments at the same position to obtain the cross-correlation corrx, the formula is as follows:

[0099]

[0100] corrx(τ) is the cross-correlation based on the delay τ, and the subscript of x indicates the acquisition time of the input signal, that is, x n-1 is the input signal at the p...

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

No PUM Login to view more

Abstract

The invention discloses a high-precision arc tangent fitting system and an ultrasonic imaging device. The system comprises: a lookup table construction module used for constructing an angle lookup table in a nonlinear model; a parameter calculation module used for calculating nonlinear model parameters; a basic coefficient calculation module used for calculating a basic coefficient; a fitting coefficient calculation module used for calculating a fitting coefficient of the nonlinear model according to the basic coefficient; and a fitting module used for fitting the arc tangent value based on the nonlinear model. Compared with the prior art, a method adopted in the invention has the advantages that 1, compared with an existing polynomial fitting method lower than three orders, the method can obtain higher calculation precision; and 2, compared with an existing polynomial fitting method lower than three orders, the calculation complexity of the method is not remarkably increased, in addition, the model fitting coefficient of the method can be calculated in advance, and the calculation efficiency is further improved.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic signal processing, and in particular relates to a high-precision arctangent fitting system and an ultrasonic imaging device. Background technique [0002] The fast and accurate arctangent method is widely used in embedded systems, signal processing, radar and other fields. The existing arctangent approximation methods mainly include three kinds: CORDIC algorithm, lookup table and polynomial. [0003] The main disadvantage of the CORDIC algorithm is that the calculation accuracy is highly dependent on the number of iterations, and high precision will inevitably lead to an increase in calculation time and consumption of storage resources. The main disadvantage of the lookup table is that it is difficult to solve the constraint problem between accuracy and efficiency. There are many related studies based on polynomials. References: RajanS, Wang S, Inkol R, et al. However, the calculation accura...

Claims

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

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01S15/89G01S7/539G06F1/03
CPCG01S15/89G01S7/539G06F1/03
Inventor 肖梦楠覃朝辉
Owner 聚融医疗科技(杭州)有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap