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True delay-based wideband phased array wave beam formation method

A broadband phased array and beam technology, which is applied in the field of broadband phased array beamforming based on true delay, can solve the problems of beam broadening and side lobe increase, high price, poor performance, etc., and achieves wide application and low cost , the effect of high flexibility

Inactive Publication Date: 2013-07-31
NANJING UNIV
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Problems solved by technology

[0004] At present, the existing broadband phased array beamforming methods mostly use delay lines, which are expensive, poor in performance, and the delay can only be discrete values; there is also a beamforming method based on subband processing, which Segmentation processing cannot fully compensate the phase shift of each frequency, which will lead to beam broadening and sidelobe increase
A broadband beamforming method based on stretching processing and phase compensation has recently been proposed, which is computationally simple but only applicable to chirp signals

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  • True delay-based wideband phased array wave beam formation method
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Embodiment Construction

[0018] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0019] The present invention discloses a new step-free signal true delay method and a broadband phased array beamforming method based on true delay. According to the nature of Fourier transform, the phase compensation in the frequency domain is used to realize the delay compensation in the time domain. The details are as follows:

[0020] According to the time-shift characteristic of Fourier transform, delay compensation can be realized by phase compensation in frequency...

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Abstract

The invention discloses a true delay-based wideband phased array wave beam formation method comprising the following steps: after a received signal of each channel is transformed into a frequency domain, performing true delay compensation respectively; if the time domain delay of the signal is tau, representing additional phase in the frequency domain after Fourier transformation; and performing inverse Fourier transformation to the time domain after performing matched filtering so as to acquire a compensated signal. The method realizes precise delay through digital signal processing.

Description

technical field [0001] The invention relates to a wideband phased array beamforming method, in particular to a broadband phased array beamforming method based on true delay, where the true delay can be any value. Background technique [0002] Phased array radar has beam agility, multi-beam forming, good anti-interference performance and long range, which makes it more and more widely used in the fields of remote early warning, space detection and weather forecasting. At the same time, in order to improve resolution and identification capabilities, phased array radar must use broadband signals. Therefore, broadband phased array radar will be an important direction for the development of radar technology. [0003] Looking at the research status at home and abroad, the beamforming technology of narrowband phased array radar is mature. As long as the wave path difference between the array elements at the center frequency is phase-shifted and then added, a beam in a specified di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02
Inventor 张兴敢孙艳艳柏业超戴作宁陈小利王兆云杜仲林魏耀
Owner NANJING UNIV
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