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
CN104777375AInactive Publication Date: 2015-07-15BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
Publication Date
2015-07-15
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Claims

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