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Radar object identification method base on Fourier primary function

A radar target and recognition method technology, which is applied in the field of radar target recognition based on Fourier basis functions, can solve the problems of slow recognition speed and low recognition probability, and achieve the effects of simple waveform, high recognition efficiency and small calculation amount.

Inactive Publication Date: 2017-02-22
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

It solves the problem of slow recognition speed and low recognition probability of moving targets in the air, and completes radar target detection and recognition by constructing E pulse waveform based on Fourier basis function through target time-domain electromagnetic echo

Method used

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  • Radar object identification method base on Fourier primary function
  • Radar object identification method base on Fourier primary function
  • Radar object identification method base on Fourier primary function

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Embodiment

[0089] In order to show the advantages of this method more clearly, a mathematical simulation is carried out here. The simulation conditions are: F15SE scale model, the zoom size is 4.30m×2.89m×1.25m, the incident azimuth angle is 30 degrees, and the pitch angle is 0 degrees.

[0090] figure 2 Convolution simulation results of E-pulse waveform and time-domain echo without using Fourier cosine basis function, image 3 It is a graph of convolution simulation results using the method of the present invention. It can be seen from the figure that the time when the convolution without the Fourier cosine base function is 0 is 145ns, and the relative amplitude is 0.05, and the time when the convolution is 0 with the Fourier cosine base function is 130ns, and the relative amplitude is 0.3 Therefore, using the method of the present invention to construct an E pulse emission waveform for a specific target time-domain echo can shorten the identification time by 10-15 ns and increase the...

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Abstract

A radar object identification method base on a Fourier primary function comprises steps of firstly carrying out electromagnetic simulation in the meter wave frequency range of a detected object to obtain a time domain scattering waveform of the object, and carrying out integration of time domain scattering echoes to obtain a post-time response model of an object scattered field and to further obtain a starting time of post-time response and a corresponding amplitude attenuation coefficient; emitting the obtained time domain scattering waveform to a currently-detected object, detecting a time domain echo reflected by the object, and carrying out rapid pole extraction to obtain a main pole, a complex residue, an attenuation factor and an attenuation frequency corresponding to the time domain scattering waveform and to further obtain a corrected time domain scattering waveform and a sampled time domain scattering waveform; and finally, establishing a Fourier cosine primary function to obtain E pulse waveforms corresponding to all objects and storing the E pulse waveforms, emitting time domain scattering waveforms corresponding to the stored E pulse waveforms to to-be-identifed objects in sequence during object identification, and detecting time domain echoes of the detected objects, so as to complete object detection.

Description

technical field [0001] The invention relates to the field of microwave remote sensing, in particular to a radar target recognition method based on Fourier basis functions. Background technique [0002] At present, radar target recognition methods generally include the following types: 1. The target recognition method based on target echo fluctuations. In this method, the radar target can be regarded as a complex target composed of multiple scatterers, and the radar echoes of each scatterer interfere with each other. According to the amplitude and phase of the radar target echo with the different attitude of the target relative to the radar, the shape and movement of the target can be judged. The disadvantage of this method is that when the radar target is detected at close range, the scattering cross-sectional area of ​​the radar target will change drastically due to the change of the target's attitude, resulting in the instability of the distance measurement. 2. The target...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/41G01S7/411
Inventor 罗熹宋大伟尚社李小军孙文锋范晓彦李栋
Owner XIAN INSTITUE OF SPACE RADIO TECH