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Target detection method when external radiation source radar reference signal contains multipath interference

An external radiation source radar and reference signal technology is applied in the target detection field when the external radiation source radar reference signal contains multipath interference, and achieves the effects of strong stability, multipath interference and fast convergence speed.

Active Publication Date: 2020-04-10
XIDIAN UNIV
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Problems solved by technology

However, when the direction of arrival of the multipath signal and the direct wave signal is relatively close, the multipath signal and the direct wave signal are inseparable in the time domain, space domain and frequency domain. At present, there is no effective method to eliminate the reference signal Multipath interference signal in

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  • Target detection method when external radiation source radar reference signal contains multipath interference
  • Target detection method when external radiation source radar reference signal contains multipath interference
  • Target detection method when external radiation source radar reference signal contains multipath interference

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Embodiment Construction

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0023] An embodiment of the present invention provides a target detection method when the external radiation source radar reference signal contains multipath interference, such as figure 1 As shown, the method includes the following steps:

[0024] Step 1, obtain the signal received by the external radiation source radar, the signal received by the external radiation source radar includes a reference signal and an echo signal, and the reference signal contains...

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Abstract

The invention belongs to the technical field of radars, and discloses a method for detecting a target when a reference signal of an external radiation source radar comprises multipath interference. The method comprises the steps: obtaining a signal received by the external radiation source radar, wherein the signal comprises the reference signal and an echo signal, and the reference signal comprises a multipath interference signal, and the echo signal comprises a direct wave signal and a multipath interference signal; sequentially carrying out the amplification, frequency mixing, A / D sampling and digital downconversion processing of the reference signal and the echo signal, and obtaining a digital reference signal and a digital echo signal; carrying out the blind balance filtering of the digital reference signal, and obtaining the reference signal after multipath interference inhibition; carrying out the time domain interference cancellation of the digital echo signal, and obtaining an echo signal after the time domain interference cancellation; carrying out the pulse compression of the echo signal after the time domain interference cancellation, thereby obtaining a target detection result. The method can achieve the inhibition of multipath interference components in the reference signal, eliminates a false target caused by the multipath interference, and obtains a better target detection result.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a target detection method when the radar reference signal of an external radiation source contains multipath interference. Background technique [0002] External radiation source radar detection targets are passive detection, relying on third-party radiation source signals for target detection. The external radiation radar receiving station directly receives the direct wave signal as a reference signal. When the reference signal contains multipath interference components, directly using the reference signal containing multipath interference signals for matching filtering will lead to the appearance of false targets. Therefore, the degree of suppression of multipath interference directly affects the performance of external radiation radar to detect targets. [0003] The external radiation source radar system adopts a dual-channel signal processing structure, that is, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 王俊郭帅陈刚王珏
Owner XIDIAN UNIV
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