Inter-pulse initial phase third-power modulation and FRFT (fractional Fourier transform)-based DRFM (digital radio frequency memory) interference detection and resisting method

An interference detection and power technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as single distance or speed interference, inability to resist distance-speed synchronization interference, and limited interference suppression performance, so as not to affect signal-to-noise ratio, facilitate subsequent processing, and improve the effect of signal-to-interference ratio

Active Publication Date: 2016-10-12
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0005] It can be seen from the above that most of the current pulse diversity methods can only fight against single distance or speed interference, but cannot fight against distance-speed synchronization interference, and the suppression performance of interference is limited

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  • Inter-pulse initial phase third-power modulation and FRFT (fractional Fourier transform)-based DRFM (digital radio frequency memory) interference detection and resisting method
  • Inter-pulse initial phase third-power modulation and FRFT (fractional Fourier transform)-based DRFM (digital radio frequency memory) interference detection and resisting method
  • Inter-pulse initial phase third-power modulation and FRFT (fractional Fourier transform)-based DRFM (digital radio frequency memory) interference detection and resisting method

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Embodiment

[0133] Simulation conditions: bandwidth B=30MHz, pulse width T p =0.6us, pulse repetition period T r = 13us LFM pulse signal, 256 PRIs in 1 CPI, 650 sampling points in each PRI, target distance 800m, speed 300m / s, signal-to-noise ratio 0dB, signal-to-interference ratio -20dB, distance of DRFM interference signal is 830m, and the speed is 270m / s.

[0134] In the above simulation, the transmission pulse with a fixed initial phase is used, processed by matched filtering and MTD, and the transmission pulse with the cubic modulation of the initial phase designed by this method is processed by this method. The simulation results after MTD are as follows Figure 4 shown. Depend on Figure 4 (a) It can be seen that when the initial phase is fixed, the target and interference peaks will appear after the radar echo passes through the MTD, and the interference peak is much larger than the target. Depend on Figure 4 (b) It can be seen that with the three initial phases of the transm...

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Abstract

The invention discloses an inter-pulse initial phase third-power modulation and FRFT (fractional Fourier transform)-based DRFM (digital radio frequency memory) interference detection and resisting method. According to the method, a multi-channel matched filter and MTD (moving target detection) are utilized to detect whether interference exists, and if interference exists, the priori information of the interference and a target are utilized to design the initial phase of the transmission pulses of a radar, the transmission pulses of the radar are transmitted; matched filtering processing of corresponding channels is carried out on echoes; and FRFT (fractional Fourier transform) is utilized to suppress the interference. With the method of the invention adopted, the detection of the target can be realized under a low signal-to-interference ratio; the signal-to-interference ratio can be improved greatly under the premise that a signal-to-noise ratio is not affected, so that the subsequent processing of signals can be facilitated; and with the decrease of the signal-to-interference ratio, the interference suppression performance of the method is stable.

Description

technical field [0001] The invention belongs to the technical field of radar anti-jamming, and in particular relates to a digital radio frequency memory (Digital Radio Frequency Memory, DRFM) interference detection and countermeasure based on interpulse initial phase cubic modulation and fractional Fourier transform (Fractional Fourier Transform, FRFT) method. Background technique [0002] With the emergence of modern deceptive jamming technology based on DRFM, radar jamming technology has entered the era of coherent jamming. In electronic warfare, after the enemy's reconnaissance electronic equipment captures the detection signal of our radar, it will generate electronic deception interference, thereby reducing the detection performance of our radar. Therefore, in order to ensure the correct detection and tracking of radar targets in the jamming environment, it is particularly important to enhance the radar's ability to resist DRFM jamming. [0003] Since it takes a certa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 张仁李奚舒靓盛卫星马晓峰韩玉兵
Owner NANJING UNIV OF SCI & TECH
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