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LFM pulse train signal waveform design method based on pulse width agility

A design method and signal waveform technology, applied in the direction of radio wave measurement systems, instruments, etc., can solve the problems of increased difficulty in engineering implementation, sensitivity to mismatched filters, easy distortion, etc., and achieve high and unambiguous speed measurement range, strong implementability, The effect of low computational complexity

Pending Publication Date: 2021-11-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0004] However, although the coded signal widely used in the waveform-agile PD radar system has the advantages of flexible waveform generation, large quantity, and various forms, the energy scattered outside the spectral bandwidth of this signal is relatively large, and it is easy to be distorted. When the Range-Side-lobe Modulation (RSM) effect occurs, the mismatch filter is very sensitive due to the large spectrum fluctuation
Therefore, while selecting such coded signals, it is necessary to adopt more complex methods to solve the problems existing in the signal itself, which increases the difficulty of engineering realization.

Method used

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  • LFM pulse train signal waveform design method based on pulse width agility
  • LFM pulse train signal waveform design method based on pulse width agility
  • LFM pulse train signal waveform design method based on pulse width agility

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Embodiment

[0065] In order to verify the effectiveness of the waveform design method of the present invention based on the pulse width, a pulse width of the LFM burst signal, the present invention is designed in the present embodiment.

[0066] In this embodiment, the bandwidth is 10 MHz, a PRT is 100 su, and the pulse width starts from 5US to a total of 16 pulse width scratch-changing LFM signals that vary to 20 su as 20 su, and by changing the symbol of the modulation frequency (positive, negative) ), The resulting LFM signal is expanded to 32. With the maximum value of the two-dimensional perfusion function modality between the signals, the maximum value of the two-dimensional interverters of the two two two two two two two two two two two two two two two-dimensional can be calculated to calculate the result. Based, according to figure 1 Dynamic planning process, generating pulse width of the pulse of 200 pulse LFM bursts. The radar detection is 100km, and the number of distance segments ...

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Abstract

The invention discloses an LFM pulse train signal waveform design method based on pulse width agility. The method comprises the steps: setting different pulse widths for different pulses in an LFM pulse train with the same bandwidth, so that each pulse signal has different modulation rates, and the cross correlation between the pulses is reduced so as to effectively improve the range gating characteristic and the folding clutter resistance of the generated LFM pulse train signal and achieve the purpose of suppressing range ambiguity and resisting folding clutter.

Description

Technical field [0001] The present invention belongs to the field of radar waveform design, and in particular, the present invention relates to a waveform design method based on pulse width scrambled LFM bursts. Background technique [0002] Linear Frequency Modulation, LFM signal signals to signal the signal's instantaneous frequency to make the signal having a larger time broadband weld, which can simultaneously meet the needs of radar detection distances and resolution. Compared with narrowband, single-frequency radar signals, linear frequency modulation signals anti-Doppler frequency shunt interference is strong, and the important parameters of the signal itself include the location information of the target, which is very suitable for positioning. Based on the above advantages, the application of the LFM burst signal is very wide in early PD radar. In subsequent research, it is often combined with other types of modulation methods to produce PD radar signals that satisfy hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36G01S7/282
CPCG01S7/36G01S7/282Y02P10/25
Inventor 范花玉刘子豪沙明辉毛二可任丽香孙颖豪
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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