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Difference frequency signal frequency detection method for frequency modulated continuous wave fuze ranging system

A technology of frequency modulation continuous wave and difference frequency signal, applied in the field of fuze, can solve the problems of increasing system cost, occupying signal processing time, large amount of calculation, etc., to save the space and signal processing time of fuze system, good application prospect, real-time detection good effect

Inactive Publication Date: 2011-10-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The traditional frequency detection method of difference frequency signal generally adopts fast Fourier transform (FFT) algorithm, but the FFT algorithm has a large amount of calculation and takes up a lot of signal processing time. Although it can be implemented with high-speed chips such as DSP and FPGA to ensure real-time performance, Increased system cost, while device volume occupies the small space of the fuze

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  • Difference frequency signal frequency detection method for frequency modulated continuous wave fuze ranging system
  • Difference frequency signal frequency detection method for frequency modulated continuous wave fuze ranging system
  • Difference frequency signal frequency detection method for frequency modulated continuous wave fuze ranging system

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Embodiment 1

[0027] The technical index of the fuze requires a distance resolution of 0.75m and a working distance of 7.5m. Assume that the starting distance of the projectile is 30m, and the approaching speed of the projectile is 600m / s. According to the following method to detect the target frequency difference frequency signal corresponding to the predetermined detonation distance, the specific steps are:

[0028] 1) Determine the sampling frequency F according to the frequency range of the difference frequency signal from 0 to 200kHz S is 1MHz, frequency resolution is 5.12kHz; N is 200;

[0029] 2) Precalculate the constant in the optimized Goertzel algorithm, and encode and store it in the frequency detection program; wherein, the frequency coefficient k in the optimized Goertzel algorithm is as shown in formula (1), and a constant coefficient coeff in the optimized Goertzel algorithm As shown in formula (2):

[0030] k = Ng ...

Embodiment 2

[0042] The fuze technical index requires a distance resolution of 0.75m and a working distance of 7.5m. Assume that the starting distance of the projectile is 30m, and the approaching speed of the projectile is 600m / s. According to the following method to detect the target frequency difference frequency signal corresponding to the predetermined detonation distance, the specific steps are:

[0043] 1) Determine the sampling frequency F according to the frequency range of the difference frequency signal from 0 to 200kHz S is 1MHz, frequency resolution is 5.12kHz; N is 200;

[0044] 2) Calculate the constant in the optimized Goertzel algorithm; Wherein, the frequency coefficient k in the optimized Goertzel algorithm is as shown in formula (1), and a constant coefficient coeff in the optimized Goertzel algorithm is as shown in formula (2):

[0045] k = Ng f det ect ...

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Abstract

The invention relates to a difference frequency signal frequency detection method for a frequency modulated continuous wave fuze ranging system, and belongs to the technical field of fuze. The method comprises the following steps of: determining sampling frequency FS according to a difference frequency signal frequency range; determining a data block point number N according to actually required frequency resolution; calculating a constant in an optimized Goertzel algorithm in advance, coding the constant and storing the constant into a frequency detection program; and detecting a difference frequency signal with target frequency when the energy of a frequency signal to be detected exceeds a preset threshold value. The method provided by the invention can be implemented by utilizing a low-cost small-volume singlechip with a low computational load so as to save a fuze system space and signal processing time and achieve high detection real-time performance, and militarily has an important application value and vast application prospect in the frequency modulated continuous wave fuze ranging system; and by the method, a difference frequency value corresponding to the optimal detonation distance of the fuze can be rapidly and effectively detected.

Description

technical field [0001] The invention relates to a method for detecting the difference frequency signal frequency of a frequency modulation continuous wave fuze fixed-distance system, belonging to the technical field of fuzes. Background technique [0002] The frequency modulated continuous wave (FMCW) fuze has many advantages such as high accuracy of distance determination, no distance blind zone, distance information is included in the frequency of the difference frequency signal, and has little relationship with the amplitude, so it has strong anti-interference ability and many other advantages. The FMCW fuze distance system ultimately needs to detect the beat frequency corresponding to the optimal detonation distance to control the fuze action. [0003] The traditional frequency detection method of difference frequency signal generally adopts Fast Fourier Transform (FFT) algorithm, but the FFT algorithm has a large amount of calculation and takes up a lot of signal proces...

Claims

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Application Information

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IPC IPC(8): G01S7/02
Inventor 陈慧敏张志军
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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