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A Direction Finding Method for Coherent Signals

A coherent signal, direction finding technique

Active Publication Date: 2021-05-25
36TH RES INST OF CETC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Radio direction finding technology is widely used in civil and military fields such as detection, navigation, and electronic countermeasures. However, when multiple incoming signals are coherent, no matter whether it is interferometer direction finding, time difference direction finding, or array direction finding, coherence cannot be achieved. The direction finding of the signal, either realizes a complex structure and a huge amount of calculation, which cannot be realized in engineering

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  • A Direction Finding Method for Coherent Signals
  • A Direction Finding Method for Coherent Signals
  • A Direction Finding Method for Coherent Signals

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Embodiment Construction

[0032] Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and are used together with the embodiments of the present invention to explain the principles of the present invention.

[0033] A specific embodiment of the present invention discloses a direction finding method for coherent signals. Such as figure 1 shown, including the following steps:

[0034] Step S01, performing Fast Fourier Transform (FFT) processing on the same digital signal received by each antenna unit of the array antenna to obtain parameters such as the center frequency, bandwidth, and amplitude of the signal to be tested;

[0035] The array antenna includes a plurality of antenna units, and each antenna unit receives the same digital signal, and the digital signal includes multiple paths;

[0036] Step S02, set the center frequency of the digital filter to...

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Abstract

The invention relates to a direction finding method for coherent signals, which belongs to the technical field of array signal processing, and solves the problems in the prior art that the direction finding method for coherent signals is complicated and has low precision. A direction finding method of a coherent signal, comprising the following steps: Step 1, determining the incoming wave angle; Step 2, constructing a fictitious digital signal from the current angle to each array, and superimposing them with corresponding array signals after digital filtering; 3. Obtain the angle of the concave point in the normalized pattern of the array antenna after zeroing calculation; Step 4. Use the angle increment as a step, gradually increase the incoming wave angle, and take the increased angle as the current angle, and repeat the steps 2 and step 3, until the current angle is equal to the end angle; step 5, analyzing the angles of each group of pits in the normalized pattern to obtain the direction of arrival of the coherent signal. The direction finding of the coherent signal is realized, the direction finding accuracy is improved, and the direction finding method is simplified.

Description

technical field [0001] The invention relates to the technical field of array signal processing, in particular to a method for direction finding of coherent signals. Background technique [0002] Radio direction finding technology is widely used in civil and military fields such as detection, navigation, and electronic countermeasures. However, when multiple incoming signals are coherent, no matter whether it is interferometer direction finding, time difference direction finding, or array direction finding, coherence cannot be achieved. The direction finding of the signal is either complex in structure and extremely computationally intensive, which cannot be realized in engineering. Contents of the invention [0003] In view of the above analysis, the present invention aims to provide a method for direction finding of coherent signals, which realizes high-precision direction finding for coherent signals generated due to multipath transmission, and the method is simple and p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S3/14
CPCG01S3/14
Inventor 华健江王李军金晓帆高腾游敬云南普龙
Owner 36TH RES INST OF CETC
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