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Cross-correlation phase noise detecting device

A detection device and phase detection technology, applied in the direction of noise figure or signal-to-noise ratio measurement, etc., can solve the problems of large measurement limitations, poor system stability, complex operation, etc., to achieve simple operation, improved noise floor index, and measurement uncertainty. degree reduction effect

Inactive Publication Date: 2015-07-15
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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Problems solved by technology

[0005] An object of the present invention is to provide a digital cross-correlation phase noise detection device to solve the problems of complicated operation, poor system stability, and large measurement limitations in other measurement methods. By selecting a high-precision reference source and simple key operation, the It can measure the phase noise of any carrier frequency within the frequency range of 1Hz to 1MHz in the frequency range of hundreds of megabytes

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Embodiment Construction

[0041] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals.

[0042] Such as figure 1 A cross-correlation phase noise detection device is shown, the detection device includes a signal-to-be-tested phase detection unit, a reference signal phase detection unit, a first preprocessor 11, a second preprocessor 12, a digital frequency synthesizer 3, a first Subtractor 51, second subtractor 52, cross power spectrum calculation unit 6 and result output unit 7; the phase detection unit of the signal to be measured includes the first quadrature power divider 21, the first phase detector 41 and the third phase detector 43 . The reference signal phase detection unit includes a second quadrature power divider 22 , a second phase detector 42 and a fourth phase detector 44 . Among them, the ...

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Abstract

The invention discloses a cross-correlation phase noise detecting device which comprises a to-be-detected signal phase detecting unit, a reference signal phase detecting unit, a first subtracter, a second subtracter and a crosspower spectrum computation module. The technical scheme adopted by the cross-correlation phase noise detecting device provided by the invention has the following advantages: an input signal frequency can cover any single-frequency point within a range of hundreds of megabytes, and real-time measurement to near carrier frequency phase noise is achieved; a testing system does not require a reference source which is the same as a to-be-tested source in frequency and orthographic with the to-be-tested source; the characteristics of a digital filter are fixed, a phase rectification calibration and low-noise amplifier is not required, so that the testing uncertainty of the system is reduced; testing links such as scaling, locking and the like are eliminated, since operation is achieved through several keystrokes, real-time measurement results can be obtained, the operation is simple and easy, and the cost performance of the detecting device is high; compared with a digital phase noise measurement system for removing noise in the prior art, the cross-correlation testing system has the noise bottom indexes improved by about 30dBc / Hz.

Description

technical field [0001] The invention relates to a phase noise measuring device. More specifically, it relates to a digital cross-correlation phase noise detection device. Background technique [0002] Since high-stable crystal oscillators and atomic frequency standards are widely used in communication electronic equipment, local oscillators of radar microwave links, and time reference standards, the phase noise index reflects the phase jitter and short-term stability of the oscillator, and is a key indicator for evaluating the performance of the oscillator . Phase noise limits the accuracy of navigation and positioning, reduces the radar's range of action, and reduces the data transmission quality of the communication system. In the Doppler radar system, by measuring the near-carrier frequency phase noise of the radar echo, it can detect low-speed sport goal. [0003] At present, the phase noise measurement devices on the market mainly include imported HP3047A, HP3048A, E...

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Application Information

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IPC IPC(8): G01R29/26
Inventor 沈婷梅王亮于航王超
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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