Microwave signal measuring method based on rapid laser scanning

A technology of microwave signal measurement and laser scanning, which is applied in the field of microwave photonics, can solve the problems of limited frequency measurement accuracy and frequency sweep rate, and cannot fully meet the needs of electronic warfare, and achieve the effect of high measurement speed

Active Publication Date: 2014-08-27
TSINGHUA UNIV
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Problems solved by technology

However, the frequency measurement accuracy and frequency scanning rate of this type of scheme are relatively limited, and cannot fully meet the needs of electronic warfare.

Method used

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  • Microwave signal measuring method based on rapid laser scanning
  • Microwave signal measuring method based on rapid laser scanning
  • Microwave signal measuring method based on rapid laser scanning

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Embodiment Construction

[0026] The present invention proposes a microwave signal measurement method based on fast laser scanning, which will be described below in conjunction with the accompanying drawings.

[0027] First build as figure 1 The shown system structure diagram of microwave measurement scheme based on laser scanning source; this figure is a serial channelization receiving device based on fast laser scanning microwave signal measurement; it can be divided into frequency scanning source branches (such as Figure 4 (b) shows the frequency sweep structure block diagram) and the modulation branch (Mach-Zehnder modulator branch); the laser source is divided into two paths by the beam splitter, one path is used as the pump light source of the frequency sweep source, and the other path uses the Mach-Zehnder The modulator modulates the microwave signal to be measured onto the light (such as figure 2 (b) shown); after the two branch signals are coupled, they enter a narrow-band low-speed balance...

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Abstract

The invention belongs to the technical field of microwave photonics, and particularly relates to a microwave signal measuring method based on rapid laser scanning. According to a measuring system, optical scanning is used as local oscillation, a plurality of receiving information channels with series time domains are built, balance detection and demodulation are performed on microwave signals to be measured, and wide-band microwave measurement and analysis can be performed within microsecond-order time. When series channelization receiving is performed, frequency beating is performed on the modulated signals to be measured and a frequency sweeping source on a photoelectric detector; when the receiving bandwidth is equal to the frequency sweeping interval, the modulated microwave signals to be measured with the frequency difference being less than delta f with the sweeping frequency can be detected in corresponding information channels after frequency beating is performed on the frequency sweeping source. According to the method, the adopted series channelization receiving mechanism has great advantages in structure, only one low-speed detection device can achieve signal receiving of all the information channels, and the series channelization receiving system can achieve very high measuring speed.

Description

technical field [0001] The invention belongs to the technical field of microwave photonics, and in particular relates to a microwave signal measurement method based on fast laser scanning. Specifically, a laser scanning structure is used to construct multiple receiving channels in time-domain series, which is suitable for real-time measurement of broadband microwave signals. Background technique [0002] In modern electronic warfare and radar applications, it is one of the basic goals of microwave signal processing to quickly and effectively obtain the frequency information of short-term burst signals. At present, the measurement of microwave multi-frequency signals is mainly based on channelized reception, frequency scanning and other schemes. Among them, the former is usually based on the idea of ​​frequency band segmentation, and a filter bank with multiple narrow subbands is the basic device to realize its spectrum segmentation, such as using a diffraction grating, Fabry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00
Inventor 陈宏伟李瑞月雷诚陈明华谢世钟
Owner TSINGHUA UNIV
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