Broadband receiving array antenna channel amplitude and phase calibration method and system

An array antenna and broadband receiving technology, applied in the field of broadband receiving array antenna channel amplitude and phase calibration methods and systems, can solve problems such as wasted labor costs, inability to solve practical problems, channel mismatches, etc., to reduce environmental requirements and labor costs. , the effect of improving adaptability

Pending Publication Date: 2022-03-15
西安思丹德信息技术有限公司
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Problems solved by technology

[0005] But in reality, the on-site environment is not so ideal. When collecting data, there are always some interference signals coming in. If the channel calibration process is performed on the polluted data according to the existing calibration algorithm, it will cause channel mismatch Even more serious, if you blindly collect data without finding the source of interference, it will greatly waste labor costs and cannot solve practical problems

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  • Broadband receiving array antenna channel amplitude and phase calibration method and system
  • Broadband receiving array antenna channel amplitude and phase calibration method and system
  • Broadband receiving array antenna channel amplitude and phase calibration method and system

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Embodiment

[0140] The following parameters are examples to represent the entire processing flow. Taking the 64-channel array calibration as an example, according to the sampling rate of 400Mhz, a chirp signal is generated by the signal generator, the frequency sweep bandwidth is 280Mhz, and the signal duration is 2e-6s. The signal interval is generated by a pseudo-random generator, and the signals collected by 64 channels are as follows: Figure 5 shown.

[0141] Using a matched filter for detection, the detection results are as follows Image 6 shown;

[0142] According to the detection results, the complex number information of the maximum signal is obtained, and the original waveform is cut and rotated by complex angles to obtain 64 channels of acquisition signals. Coherently accumulate 3 sets of data of 64 channels to improve the signal-to-noise ratio, such as Figure 7 shown.

[0143] Perform FFT on its 1024 points, take channel 1 as the reference channel, and divide other chann...

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Abstract

The invention discloses a broadband receiving array antenna channel amplitude and phase calibration method and system. The method comprises the following steps that a signal generator outputs a specified waveform; after multi-channel acquisition, original signal data is obtained; detecting the original signal data by adopting a matched filter to obtain the position information and complex angle of each signal; according to the position information output by the matched filter, multiple groups of channels are ensured to be coherent; vector superposition is carried out on multiple groups of coherent signals, and the signal-to-interference ratio is improved to the maximum extent; obtaining a correction coefficient of each channel through a multi-channel complex number division method; constructing a diagonal weighting matrix; and transforming the equalization filter to a frequency domain through the frequency factor array, and obtaining a coefficient of the time domain equalization filter by adopting a weighted least square method. According to the method, a least square method with a diagonal weighting matrix is adopted. In the correction process, the environment requirement of an acquisition scene is reduced, the adaptability of an algorithm is improved, and the labor cost of acquisition is reduced.

Description

technical field [0001] The invention belongs to the technical field of array antenna channel calibration, in particular to a method and system for calibrating the amplitude and phase of a broadband receiving array antenna channel. Background technique [0002] The broadband array system can generate flexible and agile electronically scanned beams, and based on multi-channel amplitude-phase weighting technology, it can realize simultaneous measurement and control of multi-angle airspace targets. These functions need to ensure that the amplitude and phase characteristics of multiple channels are consistent. In actual situations, each array element in the array system corresponds to an independent channel, and there must be differences between the independent analog devices in each channel, which will cause inconsistent amplitude and phase characteristics of each channel, thus affecting the system function. In order to ensure multiple The consistency of the amplitude and phase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/21
CPCH04B17/21
Inventor 张志军刘夏王晨徐炜李庆
Owner 西安思丹德信息技术有限公司
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