A kind of spectrum analyzer and its signal processing method
A spectrum analyzer and signal processing technology, which is applied in the field of spectrum analyzer and its signal processing, can solve the problems that cannot meet the high requirements of frequency resolution, and the frequency resolution of spectrum analyzer needs to be improved.
Active Publication Date: 2020-12-18
SUZHOU RIGOL PRECISION ELECTRIC TECH
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Problems solved by technology
[0006] Embodiments of the present invention provide a spectrum analyzer and its signal processing method to solve the problem that the frequency resolution of the current spectrum analyzer needs to be improved and cannot meet the current high requirements for frequency resolution
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[0069] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0070] Such as figure 2 As shown, the embodiment of the present invention provides a spectrum analyzer, including a first mixer 101 , a second mixer 102 , a first local oscillator 103 , a second local oscillator 104 , a control unit 105 and an input unit 106 . A digital signal processing circuit 108 is connected to the output of the second mixer 102 .
[0071] The input unit 106 can generate a span value Span, a resolution bandwidth RBW and a number n of sca...
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The invention provides a spectrum analyzer and a signal processing method thereof, and relates to the technical field of the spectrum measurement and test. The signal processing method of the spectrum analyzer comprises controlling a first local oscillator and a second local oscillator of the spectrum analyzer to respectively output a first local oscillator signal and a second local oscillator signal in dependence on the span value Span, the resolution bandwidth RBW and the scanning spot number n; mixing a radio-frequency input signal emitted by a radio-frequency front link with the first local oscillator signal to obtain a first intermediate frequency signal; mixing the first intermediate frequency signal with the second local oscillator signal to obtain a second intermediate frequency signal; controlling the first local oscillator to scan out a first local oscillator signal corresponding to the span value Span and controlling the second local oscillator to output a second local oscillator signal having fixed-frequency when the frequency resolution of the first local oscillator is smaller than or equal to a first value X1 and a second value X2; and controlling the second local oscillator to scan out a second local oscillator signal in a preset frequency scope when the frequency resolution of the first local oscillator is at least larger than one of the first value X1 and the second value X2.
Description
technical field [0001] The invention relates to the technical field of spectrum measurement and testing, in particular to a spectrum analyzer and a signal processing method thereof. Background technique [0002] Currently, in the field of spectrum measurement and testing, a spectrum analyzer is an instrument used to analyze the spectrum characteristics of the signal under test. It is mainly used in base station maintenance, electronic product development, production and other fields. It can measure frequency, amplitude, distortion, and modulation. , spectral purity and other parameters, with a wide frequency measurement range, low amplitude monitoring sensitivity, and high frequency resolution. Frequency resolution refers to the ability of the spectrum analyzer to distinguish adjacent frequency components. Many signal tests require the spectrum analyzer to have a fairly high frequency resolution. Only when the frequency resolution of the spectrum analyzer is high enough can ...
Claims
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IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 何毅军王悦王铁军李维森
Owner SUZHOU RIGOL PRECISION ELECTRIC TECH