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Method for suppressing main lobe oppressive jamming by multi-station radar

A suppressive interference and radar technology, applied in the field of radar, can solve the problems of large interference residual energy and affecting target detection performance, and achieve the effect of improving effectiveness and interference suppression effect, best interference suppression effect, and strong self-adaptive ability

Active Publication Date: 2019-03-19
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, under the high interference-to-noise ratio of this signal cancellation method, the interference residual energy after cancellation is large, which will seriously affect the subsequent target detection performance.

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  • Method for suppressing main lobe oppressive jamming by multi-station radar
  • Method for suppressing main lobe oppressive jamming by multi-station radar
  • Method for suppressing main lobe oppressive jamming by multi-station radar

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Embodiment Construction

[0058] Such as figure 1 As shown, the present invention discloses a method for multi-station radar suppressing main lobe suppression interference, which is characterized in that it comprises the following steps:

[0059] S1. Assuming that the multi-station radar is composed of a single transmitting station and N receiving stations, it detects the radar detection area where there is a target and a suppressive jammer, and the receiving station n obtains the echo signal r of the lth pulse repetition period n (t,l), 0≤t≤T,

[0060] Wherein, T is the time length of a pulse repetition period, l=1, 2, . . . , L, and L is the number of pulse repetition periods.

[0061] S2. Using the first receiving station as a reference, perform interference alignment on the echo signals of other receiving stations.

[0062] S2 specifically includes the following steps:

[0063] S21. Estimating the interference signal time delay τ in the receiving station n by using the cross-correlation function...

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Abstract

The invention discloses a method for suppressing main lobe oppressive jamming by a multi-station radar. The method comprises the following steps that S1, an area is detected to obtain echo signals; S2, interference alignment is carried out on the echo signals; S3, pulse compression and noncoherent-integration are carried out on the echo signals; S4, a signal amplitude ratio characteristic sequenceis calculated; S5, the amplitude ratio characteristic sequence of a multi-station radar system is obtained through the noncoherent-integration; S6, off-line learning is carried out on a target detection threshold of a feature domain by using a simulation experiment, and the target detection thresholds at different jammer-to-noise ratios are obtained; S7, the jammer-to-noise ratio in a first receiving station is estimated according to interference samples, and the target detection thresholds are obtained through query; S8, a function value and detection threshold of each time point in the amplitude ratio characteristic sequence of the multi-station radar system are compared, and target detection results are obtained. The method for suppressing main lobe oppressive jamming by the multi-station radar has the advantages that interference suppression and target detection are completed in amplitude ratio characteristic space, and the better interference suppression effect can be obtained when the jammer-to-noise ratio is higher.

Description

technical field [0001] The invention relates to a method for resisting main lobe suppressing interference, in particular to a method for multi-station radar suppressing main lobe suppressing interference, which belongs to the technical field of radar Background technique [0002] Suppressive jamming is a common jamming pattern, and its principle is to use a high-power jamming signal to flood the target echo. Correspondingly, sidelobe cancellation technology is one of the effective means to combat suppressive interference, but it can only suppress suppressive interference signals from antenna side lobes. In team jamming and self-defense jamming, the suppression jamming signal enters from the main lobe of the radar antenna, thereby forming main lobe jamming, which seriously affects the target detection performance of the radar. At this time, sidelobe cancellation techniques will be difficult to work. [0003] At present, the research on radar anti-mainlobe suppression jammin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/28G01S7/292
CPCG01S7/2813G01S7/2925G01S7/2927Y02A90/10
Inventor 赵珊珊刘子威
Owner NANJING UNIV OF POSTS & TELECOMM
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