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Double-channel digital phase noise detection device and phase noise detection method

A phase noise and detection device technology, which is applied in the direction of measuring device, noise figure or signal-to-noise ratio measurement, phase angle between voltage and current, etc., to achieve the effects of high cost performance, reduced measurement uncertainty, and easy operation

Inactive Publication Date: 2012-11-07
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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Problems solved by technology

[0005] In order to improve the deficiencies of the above prior art, the present invention proposes a dual-channel orthogonal digital phase noise measurement device and a phase noise detection method to solve the problem of real-time and accurate measurement of the phase noise of a high-precision oscillation source
Compared with the traditional test method, there is no need to correct and calibrate the Fourier frequency, which solves the traditional method that requires a reference source with the same frequency and orthogonality as the source to be tested, and can accurately measure by selecting a high-precision reference source Signals under test with a wide frequency range

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  • Double-channel digital phase noise detection device and phase noise detection method

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[0021] Such as figure 1 Shown is a schematic diagram of the structure of a dual-channel digital phase noise detection device, which mainly includes: 90° power division module 1, local oscillator module 2, A / D module 3A for sampling the in-phase component of the signal source, and A / D sampling module 3B for sampling the quadrature component of the signal source, digital frequency synthesizers 4A (DDS1) and 4B (DDS2), digital mixers 5A and 5B for the in-phase component of the signal source, and quadrature component digital mixers for the signal source 6A and 6B, signal source in-phase component digital channel decimation filters 7A and 7B, signal source quadrature component digital channel decimation filters 8A and 8B, phase difference signal demodulation and extraction module 9, computer graphic interface result display 10, etc.

[0022] The 90° power dividing module 1 completes the automatic gain of the input signal to improve the dynamic range of the received signal, and gene...

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Abstract

The invention relates to a double-channel digital phase noise detection device and a phase noise detection method. An input sinusoidal signal from 1 to 100MHz is subjected to work distribution and phase shift, then double-channel quadrature sampling and digital signal processing technologies are utilized to extract phase noise in real time, so that the problem that the Fourier frequency is required to be corrected and calibrated and subjected to other testing links in the traditional measurement method is solved, an orthogonal reference source with the same frequency as a source to be tested is not required, and through utilizing a fixed reference source, the phase difference between the source to be tested and the reference source can be accurately measured in real time.

Description

technical field [0001] The invention relates to a noise detection device, in particular to a dual-channel digitized phase noise measurement device and a phase noise detection method, which are applied to phase noise testing fields such as navigation and positioning, radar systems, etc., which have high requirements on oscillation sources. Background technique [0002] At present, the phase noise measurement devices on the market mainly include the imported HP3047A, HP3048A, E5500 series and PN9000, etc. These measurement devices are mainly based on analog technology, and their components mainly include phase detectors, phase-locked loops, low-noise amplifiers, data acquisition and computer. [0003] Phase noise is very important to the performance of communication systems or radar systems. It limits the accuracy of navigation and positioning, reduces the range of radar, and reduces the quality of data transmission in communication systems. Therefore, integrating an oscillati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R25/00G01R29/26
Inventor 沈婷梅杨晨尚林王亮李世光
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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