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An Improved Method for Measuring Doppler Frequency

A technology of Doppler frequency and radar echo, which is applied in the field of pulse Doppler frequency fuzzy processing, can solve the problems affecting the accurate measurement of target distance by low-repetition pulse Doppler radar, and achieve simple and convenient operation and high precision Effect of measurement and improvement of measurement accuracy

Active Publication Date: 2018-01-26
JINGZHOU NANHU MACHINERY CO LTD
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Problems solved by technology

[0002] For a long time, pulse Doppler radar has measured the Doppler frequency of the target by extracting the phase information of the target from adjacent cycles, but when the radar works at a lower frequency, such as low repetition frequency pulse Doppler radar , the Doppler velocity ambiguity of the target will be relatively prominent, seriously affecting the accurate measurement of the target distance by the low repetition frequency pulse Doppler radar

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  • An Improved Method for Measuring Doppler Frequency

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Embodiment Construction

[0023] The embodiment of the improved method of measuring Doppler frequency will be described in further detail below in conjunction with accompanying drawing: (see figure 1 )

[0024] A kind of improved method of measuring Doppler frequency, hardware comprises FPGA programmable logic controller, DSP digital signal processing core board; Software comprises Visual DSP++; The improved method of this measuring Doppler frequency comprises:

[0025] The staggered working mode makes the radar change the working cycle regularly;

[0026] Staggered code, the code corresponding to different duty cycles of the radar;

[0027] Doppler frequency calculation coefficients, coefficients related to period and radian;

[0028] Doppler frequency defuzzification, by comparing multiple sets of Doppler frequency values ​​to obtain the real Doppler frequency;

[0029] Recursive operation, recursive operation is performed on the Doppler frequency of the same azimuth and range unit.

[0030] A de...

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Abstract

The invention relates to an improved method for measuring the Doppler frequency and belongs to the pulse Doppler frequency fuzzy processing technical field. The improved method is completed through 8 steps based on an FPGA programmable logic controller, a DSP (digital signal processor) core board and Visual DSP++ software. According to the improved method of the invention, a process in which phase change caused by the change of the work period of a radar under different work modes is judged, and a process in which recursive processing is performed on measured Doppler frequency according to azimuths and distances, are additionally adopted, and therefore, the measurement accuracy of a low-work frequency radar for the Doppler frequency of a target of which the radial velocity is below a specific value can be effectively improved under the premise that the overall performance indexes of the low-work frequency radar can be ensured. The improved method is suitable for practical engineering application, is simple and convenient in operation and can realize high-precision measurement of the low-work frequency radar for the Doppler frequency. With the improved method adopted, the problem that target distance precise determination of the low-work frequency radar is seriously affected which is caused by a situation that the measurement accuracy of the low-work frequency radar for the Doppler frequency of the target of which the radial velocity is below the specific value can be solved.

Description

technical field [0001] The invention relates to an improved method for measuring Doppler frequency, which belongs to the technical field of fuzzy processing of pulse Doppler frequency. Background technique [0002] For a long time, pulse Doppler radar has measured the Doppler frequency of the target by extracting the phase information of the target from adjacent cycles, but when the radar works at a lower frequency, such as low repetition frequency pulse Doppler radar , the Doppler velocity ambiguity of the target will be relatively prominent, which seriously affects the accurate measurement of the target distance by the low repetition frequency pulse Doppler radar. Therefore, it is necessary to propose an improved Doppler frequency measurement method according to the working characteristics of low repetition frequency pulse Doppler radar. Contents of the invention [0003] The purpose of the present invention is: aiming at the deficiencies of the above-mentioned prior ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/50
CPCG01S13/50
Inventor 沈佳波邓兴杜昌友姚衡
Owner JINGZHOU NANHU MACHINERY CO LTD
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