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Passive radar fixed target frequency domain direction-finding method based on external radiation source

An external radiation source and passive radar technology, applied in the field of radar, can solve the problems of increased production cost of radar and threats to survivability

Inactive Publication Date: 2015-12-09
ZHOUKOU NORMAL UNIV
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Problems solved by technology

In order to obtain higher angular resolution and achieve good direction-finding performance, generally D is larger, that is, a large real-aperture antenna or a long array antenna is used, which greatly increases the production cost of the radar
In addition, in modern warfare, the active irradiation method is extremely vulnerable to enemy anti-radiation missile attacks, and the survivability of the above two direction-finding radar systems is seriously threatened

Method used

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  • Passive radar fixed target frequency domain direction-finding method based on external radiation source

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Embodiment Construction

[0046] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0047] The invention provides a frequency-domain direction finding method for a passive radar fixed target in a two-dimensional space, comprising the following steps:

[0048] Step 1, establish the direction finding system model. In two-dimensional space, the transmitter and the target of the external radiation source are fixed, and assuming that the size of the target is much smaller than the distance from the target to the receiver, and smaller than the radar beam width, it can be regarded as a point target. The receiver makes a uniform circular motion with a radius of L around its center of rotation. With the center of rotation of the receiver as the origin, a Cartesian coordinate system is established in a two-dimensional space, such as figure 1 shown.

[0049] Step 2. Deduce the slant range history R of the single-scattering po...

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Abstract

The invention discloses a passive radar fixed target frequency domain direction-finding method based on an external radiation source. The passive radar fixed target frequency domain direction-finding method comprises the steps of establishing a direction-finding system model; deducing a slant range progress of a single-scattering-point target; deducing a demodulated single-scattering-point target echo signal model and performing variable substitution for obtaining a frequency domain expression; expanding the frequency domain expression of the single-scattering-point target echo signal to a multi-target condition, modifying a target scattering strength function, and obtaining a relationship between the frequency domain expression of a multi-target echo signal and the modified target strength function; and calculating the direction of each target by means of a polar coordinate algorithm. The passive radar fixed target frequency domain direction-finding method is realized based on a narrow-band external radiation source signal in a two-dimensional space; the polar coordinate algorithm is used; and convolution operation is performed. The convolution operation can be processed through fast Fourier transform and inverse transformation, thereby greatly reducing calculation amount of the algorithm, realizing high robustness, obtaining relatively high direction finding precision and simultaneously finding a plurality of target directions in an observing area.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular to a frequency-domain direction finding method for a passive radar fixed target based on an external radiation source, which is mainly used for narrow-band continuous wave or single-frequency passive radar direction finding for a fixed target. Background technique [0002] Fixed target direction finding is an important part of enemy detection and battlefield reconnaissance, and it is of great significance in the field of battlefield situational awareness. At present, the commonly used direction finding methods include real aperture radar direction finding and array radar direction finding. Antenna length. In order to obtain higher angular resolution and achieve good direction-finding performance, D is generally larger, that is, a large real-aperture antenna or a long array antenna is used, which greatly increases the production cost of the radar. In addition, in modern warfare, act...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/14G01S3/12
CPCG01S3/12G01S3/14
Inventor 姚遥刘玉春程全梁英波李晋豆桂平
Owner ZHOUKOU NORMAL UNIV
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