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External illuminators radar false targets supression method based on sub-peak identification and equipment

A technology of external radiation source radar and false targets, which is applied in the field of external radiation source radar false target suppression based on secondary peak identification, can solve the problems that are not suitable for real-time system work and large amount of calculation

Active Publication Date: 2017-01-04
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional method can accurately identify false targets caused by side peaks, it has a huge amount of calculation and is not suitable for real-time system work

Method used

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  • External illuminators radar false targets supression method based on sub-peak identification and equipment
  • External illuminators radar false targets supression method based on sub-peak identification and equipment
  • External illuminators radar false targets supression method based on sub-peak identification and equipment

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Embodiment 1

[0059] In this embodiment, the receiving antenna is composed of a Yagi antenna and a 12-element circular array. The Yagi antenna serves as a reference antenna, pointing towards the FM broadcast transmitter. The 12-element circular array is used as a monitoring antenna, which scans the space through a digital beamforming algorithm to monitor the target area. The reference signal received by the Yagi antenna and the monitoring signal received by the circular array are preprocessed by digital down-conversion and clutter suppression. When the array beam points to a certain direction, the mutual ambiguity function is calculated to obtain the range-Doppler spectrum in this direction.

[0060] Such as figure 1 shown. A kind of external radiation source radar false target suppression method based on secondary peak identification of the present invention mainly consists of the following steps:

[0061] Step 1, the array beam points to the initial direction, pointing to 0° in this e...

Embodiment 2

[0091] This embodiment is a device embodiment, which belongs to the same technical concept as Embodiment 1. For the content not described in detail in Device Embodiment 2, please refer to Method Embodiment 1.

[0092] Such as Figure 7 As shown, a kind of external radiation source radar false target suppression device based on secondary peak identification of the present invention comprises:

[0093] The initialization unit is used to point the array beam to the initial direction, and initialize the suspected target point set X and the secondary peak point set S;

[0094] The range Doppler spectrum acquisition unit is used to calculate the mutual ambiguity function of the reference signal and the clutter-suppressed monitoring signal to obtain the range Doppler spectrum in this direction, apply the constant false alarm detector to obtain the target point set Y, and update the suspected Target point set X={X i |X i ∈X∪Y, i=1,2,...};

[0095] The first processing unit is used...

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Abstract

The invention relates to the field of FM broadcasting external radiation source radar and particularly relates to an external illuminators radar false targets supression method based on sub-peak identification and equipment. The method comprises the steps of, calculating a mutual ambiguity function of a reference signal and a monitor signal after clutter suppression and conducting constant false alarm rate detection to acquire suspected targets information; then according to a sub-peak property, detecting respectively and eliminating the false targets triggered by the sub-peak of the same range cell and the same Doppler cell to acquire real targets information. According to the method, the calculated amount of the system can be reduced and the detection property can be improved in the condition of not calculating the mutual ambiguity function of the reference signal and detecting simply and effectively and eliminating false targets triggered by the sub-peak according to the sub-peak property.

Description

technical field [0001] The invention relates to the field of FM broadcast external radiation source radar, in particular to a method and device for suppressing false targets of external radiation source radar based on secondary peak identification. Background technique [0002] External radiation source radar (also known as passive radar) is a dual / multistatic radar system that uses electromagnetic signals emitted by a third party to detect targets. The radar itself does not emit energy, but passively receives non-coordinated signals reflected by targets. The electromagnetic signal of the type radiation source is used to locate and track the target. Commonly used commercial radiation sources include analog broadcasting (FM), digital broadcasting (digital amplitude modulation broadcasting DRM, digital audio broadcasting DAB, digital TV broadcasting DVB-T, China Mobile multimedia broadcasting CMMB and digital TV terrestrial broadcasting DTMB), wireless network WIFI, GPS navig...

Claims

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Application Information

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IPC IPC(8): G01S7/38
CPCG01S7/38
Inventor 万显荣傅岩张勋易建新方高
Owner WUHAN UNIV
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