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Digital frequency shift processing method based on DSP processing platform

A technology of digital frequency shifting and processing method, which is applied in the direction of electrical digital data processing, digital function generator, digital data processing components, etc., and can solve the problems of long time consumption, short calculation time, and long running time of the sine and cosine calculation module. , to achieve the effect of small loss, improved operation efficiency, and guaranteed operation accuracy

Pending Publication Date: 2022-02-18
西安黄河机电有限公司
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Problems solved by technology

The advantage of the first method is that the calculation time is short, and the disadvantage is that a large number of storage areas are required to ensure the calculation accuracy
The advantage of the second method is that the calculation result is accurate, and the sine / cosine amplitude value at any time can be accurately calculated. The disadvantage is that the sine and cosine calculation module takes a long time to run. For digital frequency shift processing, it usually needs to calculate a large number of sine / cosine function values. Therefore, It takes a long time and does not meet the real-time requirements of radar

Method used

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  • Digital frequency shift processing method based on DSP processing platform
  • Digital frequency shift processing method based on DSP processing platform
  • Digital frequency shift processing method based on DSP processing platform

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Embodiment Construction

[0036] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0037] Furthermore, the drawings are merely schematic illustrations of embodiments of the disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus repeated descriptions thereof will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically separate entities.

[0038] In this ex...

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Abstract

The embodiment of the invention relates to a digital frequency shift processing method based on a DSP processing platform. The digital frequency shift processing method based on the DSP processing platform comprises the following steps: calculating sine / cosine function values corresponding to a starting moment and a stepping moment to obtain complex index values corresponding to the starting moment and the stepping moment; and calculating the complex exponent value at the current moment by using the complex exponent value at the previous moment and the sine / cosine function value corresponding to the stepping quantity. According to the embodiment of the invention, because the precision loss caused by product and addition and subtraction is small, the complex complex exponent operation is converted into simple product and addition and subtraction operation, and the method can greatly improve the operation efficiency under the conditions that a large amount of storage space is not needed and the operation precision is ensured.

Description

technical field [0001] Embodiments of the present disclosure relate to the technical field of radar digital signal processing, and in particular to a digital frequency shift processing method based on a DSP processing platform. Background technique [0002] In the digital frequency shift processing of radar digital signal processing, it is necessary to calculate the sine / cosine waveform as the local oscillator signal of the digital frequency shift. There are usually two ways to calculate the sine and cosine waveforms. The first is to use the principle of the digital frequency synthesizer (DDS). First, the known sine and cosine results are stored in a certain address storage area in order. The storage area is fetched, and the address of the control fetch is adjusted in real time through the frequency of the signal to be generated and the clock, so as to realize the output of continuous sine waves. When the pre-storage area is large enough, the interval of the pre-calculated s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F7/548G06F1/03
CPCG06F7/548G06F1/0307G06F2101/10
Inventor 任腊梅成沙辉邓海棠郭凯刘振兴
Owner 西安黄河机电有限公司
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