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Method and device for detecting short-term stability parameters of frequency source in digitalization mode

A detection device and detection method technology, applied in the direction of monitoring the pulse chain mode, etc., can solve the problem of low measurement accuracy, achieve the effect of solving limitations and convenient upgrading

Active Publication Date: 2013-11-27
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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Problems solved by technology

[0004] Aiming at the above deficiencies in the prior art, the present invention provides a digital detection method and device for the short-term stability parameters of the frequency source, which can accurately measure the short-term frequency stability of the frequency source and its phase noise fluctuation spectral density, and solve the problems of heterodyne method and phase-locked The ring method cannot realize the short-term stability of the frequency source and the limitation of phase noise measurement in the same instrument, the measurement method is faster and more reliable, and overcomes the shortcomings of low measurement accuracy and complicated operation in the traditional measurement method

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  • Method and device for detecting short-term stability parameters of frequency source in digitalization mode

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[0030] Such as figure 1 In order to realize the functional diagram of the short-term stability digital detection device of the present invention, the digital detection device mainly includes: input preprocessing modules 1A and 1B, input signal detection and DDS (direct digital frequency synthesis) module 2, local oscillator clock module 3, high Frequency clock module 4, clock synchronization module 5, sampling and digital down conversion modules 6A, 6B, 6C, 6D, frequency stability and phase demodulation module 7, display control module 8.

[0031] The preprocessing modules 1A and 1B select corresponding bandpass filters for anti-aliasing filtering according to the input signals of different frequency bands, so as to facilitate subsequent high-frequency signal sampling processing. The preprocessing modules 1A and 1B set the optimal dynamic range according to the ADC device. Optimum power, and generate two in-phase and quadrature signals respectively output to the sampling and d...

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Abstract

The invention relates to a device and method for detecting short-term stability parameters of a frequency source in a digitalization mode. The device comprises an input preprocessing module, an input signal detection and DDS module, a local oscillator clock module, a high frequency clock module, a clock synchronization module, a sampling and digital down frequency conversion module and a stability and phase demodulating module. Low noise band-pass sampling and phase demodulating processing is directly conducted after anti-aliasing filtering is conducted on input signals, frequency stability and phase noise are accurately measured, accuracy and reliability of a measuring system are improved by the utilization of a frequency synthesis technology, a low noise undersampling technology and a cross-correlation statistical average processing algorithm, and the method is simple and quick without complex operations of correction, calibration and the like.

Description

technical field [0001] The invention relates to a noise detection method and device, in particular to a digital detection method and device for short-term stability parameters of a frequency source. Background technique [0002] High-precision, high-stability frequency source products are widely used in various precision electronic systems such as radar, navigation, and communication. The phase noise of the frequency source makes the instantaneous frequency deviate from its nominal value, which is characterized by the phase fluctuation spectral density, while the frequency source The stability characteristics of the output frequency reflect the change of the frequency within a certain time interval, which is characterized by the frequency stability. With the continuous development of electronic technology, the performance index of the frequency source has been continuously improved, and higher requirements have been put forward for the testing technology of its stability and...

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Application Information

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IPC IPC(8): H03K5/19
Inventor 沈婷梅尚林于航袁媛王亮
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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