Sky-wave beyond visual range radar adaptive space-time joint interference-resistant method

An over-the-horizon radar, self-adaptive technology, applied to radio wave measurement systems, instruments, etc.

Inactive Publication Date: 2010-12-08
PLA AIR FORCE RADAR COLLEGE
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Problems solved by technology

[0007] The purpose of the present invention is to solve the difficulties and problems faced by the normal operation of ...

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  • Sky-wave beyond visual range radar adaptive space-time joint interference-resistant method
  • Sky-wave beyond visual range radar adaptive space-time joint interference-resistant method
  • Sky-wave beyond visual range radar adaptive space-time joint interference-resistant method

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Embodiment Construction

[0049] The interference suppression method of time domain excavation will introduce compensation error, whose size is proportional to the time length of compensation required, so this method has strict requirements on the time domain characteristics of the interference; adaptive beamforming is when the interference enters from the main lobe, But it will cause beam distortion, especially the deformation of the main lobe, resulting in confusion of signal reception. Both methods have their own shortcomings. Therefore, in the face of complex interference environments, taking comprehensive interference suppression measures has become the only way to combat various interferences.

[0050] Based on this idea, the present invention organically combines two space-time interference suppression methods, and adaptively adjusts the countermeasure method according to different characteristics of interference on the basis of interference space-time distribution detection, so as to achieve a ...

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Abstract

The invention discloses a sky-wave beyond visual range radar adaptive space-time joint interference-resistant method which inhibits interference by comprehensively utilizing two methods of adaptive beamforming and interpolation and compensation after a time domain is eliminated and achieves the purpose of making up for each other deficiencies through reasonable scheduling strategies. The transient interference entering a side lobe is resisted by utilizing the adaptive beamforming of a space domain, and the transient interference entering a main lobe is inhibited through the interpolation and the compensation after the time domain is eliminated, therefore compensating errors caused by time domain elimination and beam distortion caused by main lobe interference are prevented; and a diagonal loading amount which is in proportion to interference strength is formed for the non-transient interference entering the main lobe through interference space distribution information, therefore the strong main lobe interference is prevented from causing the serious distortion of the shapes of adaptive beams. The invention is established on the basis of a dimension-reducing beam space adaptive beamforming method, thereby greatly reducing the amount of signal processing calculations; and concrete steps are seen in an attached figure. The invention is not limited to a sky-wave beyond visual range radar system, can be widely applied to large-sized phased array radars of multiple types and has popularization and application value.

Description

technical field [0001] The invention relates to a space-time self-adaptive anti-jamming method in the field of radar signal processing, which is suitable for a signal processing system of sky-wave over-the-horizon radar, and can be used for moving target detection in the presence of various directional interference backgrounds. At the same time, the core theories and methods can also be applied to other signal processing systems that require interference suppression. Background technique [0002] The sky-wave over-the-horizon radar uses the ionosphere's reflection of electromagnetic waves to detect targets beyond the visual range. It has a long working distance and a large coverage area, and can provide long-distance early warning intelligence information. However, due to the special working system, it is easily affected by various interferences, resulting in the following problems: (1) the system works in a crowded high-frequency band (3-30MHz), and the industrial interfere...

Claims

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Application Information

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IPC IPC(8): G01S7/36
Inventor 陈建文鲍拯王永良王俊吴志文
Owner PLA AIR FORCE RADAR COLLEGE
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