Broadband microwave power meter and interference signal filtering method

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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Problems solved by technology

[0007] Aiming at the shortcoming that the existing radio telescope calibration broadband power meter is easily affected by interference signals, the present invention proposes a digital broadband microwave power meter with interference suppression capability

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