Frequency modulation detection target echo simulation method based on fractal theory

A fractal theory and target echo technology, applied in the field of short-range detection, can solve the problems of not considering the terrain model and not being able to replace the measured data, etc., and achieve the effect of shortening the measurement cycle, saving manpower and financial resources, and the radar echo data is real

Active Publication Date: 2018-10-02
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, the target fluctuation principle considered by this method is based on the swerlin model,

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  • Frequency modulation detection target echo simulation method based on fractal theory
  • Frequency modulation detection target echo simulation method based on fractal theory
  • Frequency modulation detection target echo simulation method based on fractal theory

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[0052] Example

[0053] This embodiment adopts the following system parameters: triangular wave chirp system, center frequency is F=1GHz, modulation period T m =0.32ms, frequency deviation △F=12.8MHz, movement height of projectile 20m~2m, projectile falling angle is 60°, vertical falling speed is 300m / s, difference frequency sampling rate f s = 5GHz.

[0054] Such as figure 1 As shown, the present invention includes the following steps:

[0055] (10) Signal generation: generate a triangular wave chirp signal according to the system parameters, and simulate its motion orbit according to the motion parameters of the projectile;

[0056] (20) Generate terrain data: Use the midpoint displacement method in fractal theory to perform 3D terrain modeling to obtain terrain DEM data;

[0057] (30) Build a scattering unit model: use DEM data as terrain data to build a scattering unit model through the equal Doppler ring-equid distance method, and simulate the echo of the scattering unit;

[0058] (...

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Abstract

The invention relates to a frequency modulation detection target echo simulation method based on a fractal theory. The method comprises the following steps: triangular wave linear frequency modulationsignals are generated; the fractal theory is adopted to obtain DEM data of a three-dimensional terrain; through an equal Doppler ring-equal distance method, the DEM data are used as terrain data to build a scattering element model, and echoes of a scattering unit are simulated; and the echoes of all scattering units in a radar antenna beam irradiation area are stacked to realize simulation on theground echoes. The problems that an outfield test takes a long time and costs much money can be solved, and compared with other echo simulation methods, the method of the invention considers influences of the three-dimensional terrain on echo simulation, and the data are more real and effective.

Description

technical field [0001] The invention relates to short-range detection technology, in particular to a method for simulating echoes of frequency modulation detection targets based on fractal theory. Background technique [0002] At present, the traditional radar simulation technology has a relatively good application in the low-resolution radar system. However, with the continuous increase of radar signal bandwidth and the movement characteristics of most radar platforms, the characteristics of wideband radar echoes become more and more complex, and the point echo model is no longer applicable, replaced by surface / volume echo wave model. Therefore, studying the echo modeling and simulation under undulating terrain and generating more realistic radar echo data can not only provide data for the algorithm research in the radar system, but also replace the measured data to a certain extent. Performance testing has important theoretical significance and practical value. [0003]...

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Application Information

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IPC IPC(8): G01S7/40
CPCG01S7/4052
Inventor 赵惠昌邢姣刘倩云
Owner NANJING UNIV OF SCI & TECH
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