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Cascade cancellation method for same-frequency interference of external radiation source radar based on cognition of airspace characteristics

A technology for external radiation source radar and co-frequency interference, which is applied in the field of external radiation source radar co-frequency interference cascade cancellation, can solve the problems of difficult co-frequency interference and effective suppression, and achieve low computational complexity, strong practicability, and systematic The effect of low hardware requirements

Active Publication Date: 2022-04-22
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

[0004] However, unlike traditional external radiation source radars, mobile communication external radiation source radars not only have interference from the main base station but also many other co-frequency base station interferences. At present, most of the external radiation source radar interference suppression methods researched at home and abroad are main base station interference suppression methods. , it is difficult to effectively suppress co-channel interference in mobile communication external radiation source radar, so it is urgent to study effective co-frequency interference suppression methods to provide key technical support for the development of mobile communication external radiation source radar

Method used

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  • Cascade cancellation method for same-frequency interference of external radiation source radar based on cognition of airspace characteristics
  • Cascade cancellation method for same-frequency interference of external radiation source radar based on cognition of airspace characteristics
  • Cascade cancellation method for same-frequency interference of external radiation source radar based on cognition of airspace characteristics

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Embodiment

[0049] refer to figure 1 , a cascading cancellation method for co-channel interference of external radiation source radar based on the cognition of airspace characteristics, including the following steps:

[0050] 1) An array antenna with M array elements is used as the receiving antenna of the external radiation source radar to obtain echo signals including moving target echoes and co-frequency interference of multiple radiation source base stations Among them, m=1,2,...M;

[0051] 2) Using the fusion of cyclostationary characteristics and the spatial spectrum estimation method in the compressed sensing sparse reconstruction algorithm to obtain the current echo signal The direct wave direction θ of the base station with the strongest energy, the process is as follows:

[0052] 1-2) First, the echo signals of each array element Respectively with the echo signal of the first array element Carry out k-point circular cross-correlation processing, as shown in formula (1): ...

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Abstract

The invention discloses a cascading cancellation method for same-frequency interference of external radiation source radar based on the cognition of airspace characteristics. Echo signal; 2) Obtain the direct wave direction of the base station with the strongest energy in the current echo signal; 3) Obtain the direct wave signal of the current strongest energy base station; 4) Obtain the echo after the interference cancellation of each array element of the echo antenna 5) Obtain the interference-to-noise ratio of the time-domain interference cancellation echo signal; 6) The same-frequency interference is suppressed. This method can cascade and cancel the same-frequency interference from different radiation sources when the limited array scale is realized in the case of the same-frequency interference of multiple radiation sources outside the mobile communication radiation source radar. This method has strong practicability.

Description

technical field [0001] The invention relates to radar interference suppression in radar technology, in particular to a method for co-frequency interference cascade cancellation of external radiation source radar based on airspace feature recognition. Background technique [0002] With the development of modern technology, traditional radars are facing threats from target stealth, anti-radiation missiles, low-altitude penetration, and electronic interference. It is urgent to study new system radars to adapt to the new environment. Different from traditional active active radar, external radiation source radar (also known as passive radar) does not need to actively radiate electromagnetic signals, but indirectly uses electromagnetic signals emitted by a third party to detect targets. It has low cost, good concealment, and anti-interference ability Strong, good electromagnetic compatibility and many other advantages, but also has great potential in detecting stealth targets and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/02G01S7/36G01S7/41
CPCG01S7/023G01S7/36G01S7/415G01S7/418
Inventor 王海涛贾东马跃武廖可非蒋俊正
Owner GUILIN UNIV OF ELECTRONIC TECH
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