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Broadband radar imaging method based on random intermittent sampling LFM (Linear Frequency Modulation) signal

A technology of chirp signal and broadband radar, which is applied in the field of radar to achieve the effect of improving anti-jamming performance, reducing the burden and wide application range

Active Publication Date: 2018-12-18
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

But at the same time, the jamming technology for LFM imaging radar is also developing rapidly, which poses a serious challenge to the practical application of LFM imaging radar

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  • Broadband radar imaging method based on random intermittent sampling LFM (Linear Frequency Modulation) signal
  • Broadband radar imaging method based on random intermittent sampling LFM (Linear Frequency Modulation) signal
  • Broadband radar imaging method based on random intermittent sampling LFM (Linear Frequency Modulation) signal

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Embodiment Construction

[0067] The applicable object of the present invention is broadband imaging radar. figure 1 Be a brief flow chart of the present invention, analyze the concrete steps and the effect of this method below in conjunction with accompanying drawing:

[0068] Step 1: Perform random intermittent sampling pulse parameter design. It is assumed here that the width of the random intermittent sampling symbol is τ=0.1μs, and the coding sequence is a pseudo-random sequence with a duty cycle of 50% generated by the "RANDERR" function of MATLAB.

[0069] Step 2: Design and generate random intermittent sampling LFM signal. A set of ISAR imaging data measured by the actual Yak-42 aircraft is used for verification. The signal carrier frequency is f 0 = 5.52GHz. The pulse width is T=25.6μs, then the total number of code elements of the coded sequence within one pulse width is N 0 =T / τ=256. The signal bandwidth is B=400MHz, then the frequency modulation slope of the signal is μ=B / T=1.56×10 1...

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Abstract

The invention relates to a broadband radar imaging method based on a random intermittent sampling LFM (Linear Frequency Modulation) signal. The broadband radar imaging method comprises the steps of: (1), designing a random intermittent sampling pulse parameter; (2), obtaining an intermittent sampling LFM signal by design; (3), transmitting and receiving the random intermittent sampling LFM signal;and (4), completing imaging processing based on sparse reconstruction of compressed sensing. The broadband radar imaging method in the invention has the main benefits that: for a broadband imaging radar, an imaging method based on the random intermittent sampling LFM signal is provided, so that the anti-interference performance of the radar is improved; the complete LFM signal is partly transmitted and received by the designed random intermittent sampling LFM signal; therefore, the radar sampling data size is reduced; the broadband radar data storage burden is lightened; the broadband radar imaging method is wide in application range, and can be suitable for different systems of imaging radars; and for example, the broadband radar imaging method can be used in SAR and ISAR imaging.

Description

【Technical field】 [0001] The invention belongs to the field of radar, and specifically relates to radar imaging technology, and furthermore, aims at broadband imaging radar, and proposes a broadband radar imaging method based on random intermittent sampling chirp signals. 【Background technique】 [0002] High-resolution radar images can provide information such as the length, size, and shape of targets, so they are of great significance for target recognition. Wideband imaging radars including Synthetic Aperture Radar (SAR) and Inverse Synthetic Aperture Radar (ISAR) play an indispensable role in both military and civilian fields due to their high-resolution imaging capabilities. [0003] Linear frequency modulated signal (LFM) is widely used in wideband imaging radar due to its advantages of large time-width bandwidth product and high Doppler tolerance. But at the same time, the jamming technology for LFM imaging radar is also developing rapidly, which poses a serious chall...

Claims

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9064
Inventor 赵锋吴其华艾小锋刘晓斌刘进徐振海王雪松肖顺平
Owner NAT UNIV OF DEFENSE TECH
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