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Method for calibrating high-frequency radar antenna array channel by using ionosphere echo

A radar antenna and channel correction technology, which is applied to radio wave measurement systems, instruments, etc., can solve the problems of inability to solve the non-uniqueness of the front direction, unfavorable miniaturization and portability of high-frequency ground wave radar, and a large amount of calculation. Achieve the effect of cheap channel correction, reduced computational complexity, and small amount of computation

Inactive Publication Date: 2006-07-19
WUHAN UNIV
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Problems solved by technology

However, the above-mentioned invention must rely on a specific array form, that is, a translation-invariant array element pair group to separate ocean echoes in a single direction of arrival, which is unfavorable for the miniaturization and portability of high-frequency ground wave radars, and when using When arraying in a straight line, the problem of non-uniqueness of the array direction cannot be solved
At the same time, the multi-dimensional search algorithm is still used in the above correction method, which has a large amount of calculation, and there is still the risk of the search converging on the local optimal value

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  • Method for calibrating high-frequency radar antenna array channel by using ionosphere echo
  • Method for calibrating high-frequency radar antenna array channel by using ionosphere echo
  • Method for calibrating high-frequency radar antenna array channel by using ionosphere echo

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Embodiment Construction

[0016] The present invention will be described in more detail below in conjunction with the accompanying drawings and embodiments.

[0017] The working principle and working environment of high frequency radar are introduced as follows:

[0018] High-frequency ground wave radar is usually composed of transmitting antenna, receiving antenna array, transmitter, receiver, signal processor, etc. In order to reduce construction costs and maintenance costs, co-location of transmitting and receiving is generally adopted. The radar emits high-frequency electromagnetic waves to the sea ahead, and receives backscattered echo signals from the ocean to extract information on the sea surface flow field, wind wave field, and sea surface moving targets. Radar usually adopts a linear frequency modulation system, and performs low-pass filtering, sampling, and fast-time discrete Fourier transform on the demodulated signal in each frequency sweep period to obtain the distance spectrum of the fre...

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Abstract

The invention relates to an adjusting method for using ionospheric echo to do high frequency wire array channel, which is characterized in that it detects the ion layer reflecting signal in high frequency radar ionospheric echo and uses the statistical analysis on array each channel ionospheric echo to do the channel amplitude and phase adjusting. It is a truly non-channel adjusting method without any limit to the wire array type.

Description

technical field [0001] The invention relates to a method for correcting array channels of high-frequency radars by using ionospheric echo signals. Background technique [0002] High-frequency (3-30MHz) radar has the advantages of large scattering area and low data rate due to its use of sky-wave or ground-wave propagation to achieve over-the-horizon detection, and its wavelength is comparable to the scale of maneuvering targets (such as aircraft, ships, etc.) , has been widely used in maneuvering target detection and tracking, marine environment monitoring and so on. [0003] High-frequency radars use antenna arrays and space beamforming or directional technology to estimate the target azimuth, and can detect moving targets such as ships, aircraft, and missiles in real time beyond the visual range. In addition, using the scattering mechanism of high-frequency electromagnetic waves on the ocean surface, large-scale, high-precision and all-weather real-time monitoring of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40
Inventor 周浩文必洋吴世才
Owner WUHAN UNIV
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