Method and device for acquiring angle correlation value

Abstract

The invention discloses a method for acquiring an angle correlation value. A trigonometric function value corresponding to each addressing angle in an angle region is preset; an addressing angle corresponding to a query angle is determined, a trigonometric function value of the addressing angle is acquired, and a coordinate area which the query angle belongs to is determined; a corresponding relationship between the trigonometric function value of the query angle and the trigonometric function value of the addressing angle is determined according to the coordinate area; and the trigonometric function value of the query angle is determined according to the determined corresponding relationship and the trigonometric function value of the addressing angle. The invention further discloses a device for acquiring an angle correlation value.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to a method and device for acquiring angle-related values. Background technique [0002] At present, three methods are generally used to calculate the trigonometric function value of an angle in a system on chip (SoC, System on Chip): [0003] One, adopt software to calculate the trigonometric function value; adopt this method to consume very long central processing unit (CPU, Central Processing Unit) time, increase the load of CPU, pull down the computational efficiency of system; For real-time high and For systems that require high control precision, this will make it difficult for the CPU to respond to other things, and generally trigonometric functions need to be calculated frequently. [0004] 2. The coordinate rotation digital calculation (Cordic) algorithm is adopted; this algorithm requires cyclic iterations, and whether it is realized by software or hardware, it ta...

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Problems solved by technology

[0003] One, adopt software to calculate the trigonometric function value; adopt this method to consume very long central processing unit (CPU, Central Processing Unit) time, increase the load of CPU, pull down the computational efficiency of system; For real-time high and For systems that require high control precision, this will make it difficult for the CPU to respond to other things, and generally trigonometric functions need to be calculated frequently

[0004] 2. The coordinate rotation digital calculation (Cordic) algorithm is adopted; this algorithm requires cyclic iterations, and whether it is realized by software or hardware, it takes a long time to calculate; the Cordic algorithm calculates trigonometric functions, and to improve the calculation accuracy, it needs Increase the number of iterations, which increases the calculation time, and the Cordic algorithm itself is very inaccurate for small angle calculations, and has certain limitations

[0005] 3. Calculate the trigonometric function by building an analog circuit; use this method to pass the data to the digital part through the analog-to-digital conversion circuit after the calculation of the analog circuit is completed; the calculation accuracy of the analog circuit is not easy to guarantee The conversion will also lose a certain accuracy, and will add additional circuits, increase the SoC area, and power consumption will increase accordingly; and this method has higher technical requirements for analog designers, who must be proficient in analog circuit design and also To master mathematical modeling, the design is more difficult

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