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A method for measuring the velocity of intermediate ballistic projectiles based on pwvd distribution

A speed measurement, projectile technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of poor frequency aggregation at the front and end of the data, large cross-term interference, etc., to save processing time, high frequency resolution, and improve efficiency. Effect

Active Publication Date: 2021-06-22
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In short, the problems existing in the existing technology are: when the PWVD distribution algorithm is used to extract the projectile velocity information, the interference of the cross item is large, and the frequency aggregation of the front end and end of the data is poor

Method used

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  • A method for measuring the velocity of intermediate ballistic projectiles based on pwvd distribution
  • A method for measuring the velocity of intermediate ballistic projectiles based on pwvd distribution
  • A method for measuring the velocity of intermediate ballistic projectiles based on pwvd distribution

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Effect test

Embodiment 1

[0076] In order to verify the effectiveness of the algorithm, the simulation signal is a 256-point chirp signal generated by the fmlin function in MATLAB, and the deviation of the signal frequency estimation is analyzed through the Wigner-Ville distribution, and the performance of the algorithm is checked from the simulation graph. Figure 4 is the time-domain diagram of the chirp signal, Figure 5 is the frequency domain diagram of the chirp signal, Figure 6 is the instantaneous frequency estimation graph of the Wigner-Ville algorithm, Figure 7 is the instantaneous frequency estimation graph optimized by the threshold method, Figure 8 is the instantaneous frequency estimation map after front-end fitting. From the simulation results, the frequency resolution of the Wigner-Ville distribution algorithm is high, but the time-frequency aggregation of the front end and the end is poor. Through the threshold method and the front end fitting, the frequency estimation deviation i...

Embodiment 2

[0078] In this example, the PWVD distribution optimization algorithm of the present invention will be used to process the actual projectile signal, and finally the V-T curve of the projectile echo signal will be drawn in MATLAB. Figure 9 , Figure 12 are the time-domain waveforms of the echo signals of two different types of weapon projectiles, Figure 10 , Figure 13 is the projectile V-T curve realized by utilizing the optimized PWVD distribution algorithm of the present invention, Figure 11 , Figure 14 It is the V-T curve obtained by front-end fitting according to the optimization algorithm of the present invention. It can be seen from the simulation graph that the speed begins to decrease when it reaches the peak value. The inflection point here is the end of the post-effect period of the projectile. trajectory. Considering the actual signal, the present invention can characterize the duration of the post-effect period of the projectile, that is, the parameter law o...

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Abstract

The invention discloses a method for measuring the velocity of an intermediate ballistic projectile based on PWVD distribution, which includes the following steps: (10) signal extraction: extracting an effective signal from the collected projectile echo signal; (20) judging the data length: intercepting the effective signal from the A data segment of a certain length, and judge whether the data segment needs to be sampled according to the data length; (30) time-frequency analysis: perform PWVD time-frequency analysis on the intercepted effective signal data segment; (40) instantaneous frequency acquisition: adopt valve value method to search for the maximum value of the frequency spectrum, and perform front-end fitting to obtain the instantaneous frequency of the signal; (50) Acquisition of projectile velocity: convert frequency and velocity according to the relationship between Doppler frequency and velocity, obtain the velocity-time curve, and calculate the velocity parameter optimize. The method for measuring the velocity of an intermediate ballistic projectile of the invention has high frequency resolution and small instantaneous frequency estimation deviation.

Description

technical field [0001] The invention belongs to the technical field of radar velocity measurement, in particular to a method for measuring the velocity of an intermediate ballistic projectile based on PWVD distribution with high frequency resolution and small instantaneous frequency estimation deviation. Background technique [0002] Intermediate ballistics is a branch of ballistics that emerged after the Second World War. The intermediate ballistic measurement section of the ballistic target trajectory is mainly used for the flight characteristics of shells, rockets, missiles, various firearms and their models within the muzzle aftereffect period. , motion parameters and measurement of related physical phenomena. Through the measurement of the velocity of the intermediate ballistic projectile, the performance parameters of the weapon can be obtained, and various phenomena and internal connections of the weapon system during the firing process can be found. In terms of inte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 蔡征宇张建城程风雷
Owner NANJING UNIV OF SCI & TECH
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