Broadband microwave power meter and interference signal filtering method

A microwave power meter and interference signal technology, applied in the measurement of electric power, transmission systems, electric vehicles, etc., can solve problems such as the influence of interference signals, achieve high stability, and ensure the effect of normal observation

Active Publication Date: 2011-08-10
龙非池
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Problems solved by technology

[0007] Aiming at the shortcoming that the existing radio telescope calibration broadband power meter is easily affected by interf

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  • Broadband microwave power meter and interference signal filtering method

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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0021] The present invention is based on the following principles. When a broadband microwave power meter is used for calibration and measurement of a large radio telescope, since the total power (or average power) of the microwave signal is concerned, when some frequency bands are subject to narrow-band interference, the frequency bands can be filtered out. Then continue the measurement. This method will reduce the sensitivity of the system to a certain extent due to the reduction of signals in some frequency bands, but in general, the bandwidth of interference is very small compared with the total bandwidth of observation, so it usually does not affect the normal use of the power meter .

[0022] Based on high-speed di...

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Abstract

The invention discloses a broadband microwave power meter and an interference signal filtering method. The power meter comprises an A/D conversion module, an FFT (fast Fourier transform) module, a power spectrum estimation module, a power spectrum integration module, an interference detection module and a digital filter module, wherein the A/D conversion module is used for carrying out A/D conversion for an intermediate-frequency input signal, the signal is converted to a digital signal from an analog signal; the FFT module is used for converting the digital signal to a frequency domain from a time domain; the power spectrum estimation module is used for carrying out power spectrum estimation for the frequency domain signal; the power spectrum integration module is used for accumulating the power spectrum to improve the signal to noise ratio of the power spectrum estimation; the interference detection module is used for identifying an interference signal; and the digital filter moduleis used for filtering the interference signal. According to the broadband microwave power meter disclosed by the invention, the interference signal entering the frequency band is automatically identified and filtered; and meanwhile, filter parameters are manually configured so as to ensure that a radio telescope can normally observe in the presence of stronger interference signals.

Description

technical field [0001] The invention relates to the fields of radio astronomy technology and space detection, in particular to a radio telescope calibration digital broadband microwave power meter and a method for removing interference by using the microwave power meter. Background technique [0002] The main function of the microwave power meter is to perform intermediate frequency amplification, square law detection and integration on the signal output by the front-end receiver. After passing through the power meter, the power signal received by the antenna is converted into a corresponding level value for output. [0003] Broadband microwave power meter is the core equipment for large radio telescope pointing calibration, system noise temperature measurement, antenna gain measurement, etc. In radio astronomy observations, microwave power meters are also required as measurement tools. [0004] Traditional broadband power meters mainly use analog detection mode. With the ...

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Application Information

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IPC IPC(8): G01R21/00G01R23/16H04B15/00
Inventor 孔德庆张洪波苏彦朱新颖郑磊李俊铎李春来
Owner 龙非池
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