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Interferometer phase difference measurement circuit and measurement method suitable for short-term multi-frequency signals

A technology for measuring circuits and measuring methods, applied in measuring devices, radio wave measuring systems, instruments, etc., can solve problems such as spectrum leakage and phase difference measurement accuracy reduction, and achieve the effect of overcoming DFT spectrum leakage

Active Publication Date: 2019-10-25
成都泰格微电子研究所有限责任公司
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Problems solved by technology

However, DFT will bring spectrum leakage. When the sampling time is short, this defect will reduce the accuracy of phase difference measurement.

Method used

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  • Interferometer phase difference measurement circuit and measurement method suitable for short-term multi-frequency signals
  • Interferometer phase difference measurement circuit and measurement method suitable for short-term multi-frequency signals

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Embodiment Construction

[0028] Further describe the technical scheme of the present invention in detail below in conjunction with accompanying drawing:

[0029] Such as figure 1 and figure 2 As shown, the interferometer phase difference measurement circuit suitable for short-term multi-frequency signals includes a direction-finding channel, a reference channel, a cross-correlation module, and a phase difference module. Or a single signal of multiple modulation modes is separated from the mixed signal, the cross-correlation module is used to perform time-domain cross-correlation on the separated single signal, and the described phase difference module is used to obtain the time-domain cross-correlation Find the phase difference of the signal.

[0030] In this embodiment, the direction finding channel and the reference channel both include:

[0031] Multi-frequency short-time real-time signal acquisition unit: used to collect short-time real-time signals with multiple frequencies or multiple modula...

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Abstract

The invention discloses an interferometer phase difference measurement circuit and an interferometer phase difference measurement method applicable to short-time multi-frequency signals. The measurement circuit comprises a direction finding channel, a reference channel, a cross-correlation module and a phase difference obtaining module, wherein the direction finding channel and the reference channel are used for separating single signals not aliasing in frequency domains or in mutiple modulation modes from mixed signals, the cross-correlation module is used for performing time-domain cross-correlation on the separated single signals, and the phase difference obtaining module is used for obtaining phase differences from signals obtained from time-domain cross-correlation. The interferometer phase difference measurement circuit has the advantages that frequency-domain processing is combined with time-domain phase discrimination, the respective phase differences can be obtained from different frequencies or multiple kinds of modulation modes of signals entering the channels, and the defect that DFI frequency spectrum leakage when a data number is small and frequency resolution is low is overcome, so that precision approximating to a CRLB (Cramer-Rao low bound) is obtained.

Description

technical field [0001] The invention relates to an interferometer phase difference measuring circuit and a measuring method suitable for short-time multi-frequency signals. Background technique [0002] The interferometer reconnaissance and direction-finding system uses multiple antenna units with different spatial distributions to measure the wavefront phase of the received signal, and realizes the estimation of the angle of arrival of the target signal by measuring the phase difference of the received signal between channels. Compared with the direction finding method using amplitude comparison, it has higher direction finding accuracy. [0003] The phase difference measurement can be performed in the time domain or in the frequency domain. When the sampling time is short (for example, 0.5us, the same below) and the signal-to-noise ratio is the same, the phase detection in the frequency domain can obtain relatively high accuracy. . In addition, due to the narrow-band fil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S3/48
CPCG01S3/48
Inventor 王博杨振宇
Owner 成都泰格微电子研究所有限责任公司
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