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Navigation radar dense same-frequency asynchronous interference medium-frequency signal layer suppression method

A co-frequency asynchronous, navigation radar technology, used in radio wave measurement systems, instruments, etc., can solve the problem of difficult to retain phase information, and achieve the effect of protection from being modified

Active Publication Date: 2017-05-31
NAVAL AERONAUTICAL & ASTRONAUTICAL UNIV PLA
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Problems solved by technology

[0008] The invention provides a navigation radar dense co-frequency asynchronous interference intermediate frequency signal layer suppression method to solve the technical problem that the existing video signal layer co-frequency asynchronous interference suppression technology is difficult to retain phase information

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  • Navigation radar dense same-frequency asynchronous interference medium-frequency signal layer suppression method
  • Navigation radar dense same-frequency asynchronous interference medium-frequency signal layer suppression method
  • Navigation radar dense same-frequency asynchronous interference medium-frequency signal layer suppression method

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Embodiment Construction

[0037] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0038] The azimuth echo sequence mentioned in the present invention represents that under the radar circular scanning condition, the echo sequence formed by the continuous azimuth echo envelope at the equal distance between the radar origin is expressed as The I subgrade band signal sequence of its corresponding intermediate frequency echo sequence is expressed as The corresponding Q subgrade band signal sequence of the intermediate frequency echo sequence is expressed as and

[0039] see figure 1 As shown, the present invention provides a navigation radar dense co-frequency asynchronous interference intermediate frequency signal layer suppression method, comprisin...

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Abstract

The invention provides a navigation radar dense same-frequency asynchronous interference medium-frequency signal layer suppression method. The method includes: through envelope signals generated through zero medium-frequency signals, finding a position where same-frequency asynchronous interference appears in video azimuth echo; according to recorded same-frequency asynchronous interference position, respectively performing interference suppression in real signals of branches I and Q of zero medium frequency to retain zero medium frequency phase information so as to lay a foundation for coherent processing of subsequent radar signals. In the process of interference suppression, weight coefficient and protection factor are introduced, and the protection factor is utilized to protect original azimuth echo amplitude, so that same-frequency asynchronous interference signals are eliminated while original data are protected to greatest extent from being modified.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, and more specifically, to a method for suppressing a navigation radar dense co-frequency asynchronous interference intermediate frequency signal layer. Background technique [0002] At present, since navigation radars are widely used on various types of ships, the frequency bands are mostly concentrated near the X-band, and the transmission frequencies are relatively close. In addition, when ships sail in formation and a large number of fishing boats go out to sea together for fishing, etc., co-frequency interference is more likely to occur. In addition, with the development of radar technology, more and more solid-state navigation radars are used. Since its peak power is difficult to reach a high level, in order to ensure its detection power, it is necessary to increase the emission pulse width appropriately to improve the emission. If such a wide pulse enters the adjacent radar ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36G01S7/41
CPCG01S7/36G01S7/41
Inventor 刘宁波黄勇王国庆李保珠关键董云龙周强何友
Owner NAVAL AERONAUTICAL & ASTRONAUTICAL UNIV PLA
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