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Amplitude phase calibration method used for multi-channel millimeter-wave radar

A technology of millimeter wave radar and calibration method, which is applied in the field of radar and can solve the problems of limited measurement accuracy of static method and failure to work normally.

Active Publication Date: 2018-06-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
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Problems solved by technology

The system cannot work normally when measured by the static method. For the radar system, there is a big difference between the characteristic parameters of the radar system during normal operation and the static state, and with the change of working time and environment, especially the change of working temperature, The amplitude and phase characteristics of the transceiver channel will change, so the measurement accuracy of the static method is limited. It is very important to develop a calibration network with real-time measurement and calibration capabilities to ensure the long-term reliability and stability of the W-band radar system.

Method used

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  • Amplitude phase calibration method used for multi-channel millimeter-wave radar
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  • Amplitude phase calibration method used for multi-channel millimeter-wave radar

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Embodiment Construction

[0048] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0049] Six-port technology was first used for microwave power measurements, then expanded to voltage, current, impedance, and phase measurements, and eventually became an alternative implementation of vector network analyzers. A typical six-port network consists of a passive six-port junction and four square-rate detectors, and its schematic diagram is shown in figure 1 shown. P in the figure 1 is the Wilkinson power divider, H 1 、H 2 、H 3 For 90° quadrature couplers, P 1 、H 1 、H 2 and H 3 Together they constitute a six-port junction, in which ports 1 and 2 are input terminals, ports 3, 4, 5, and 6 are output terminals, and each output terminal is connected to a power detector, and the output voltage of the detector is V i (i=3,4,5,6) is proportional to the power of the detector input signal. According to the theory of the six-port network, when ...

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Abstract

The invention discloses an amplitude phase calibration method used for a multi-channel millimeter-wave radar. According to the invention, measurement and calibration of four parameters including channel amplitude and phase error of a plurality of transceiving channels working in a transmission mode and channel amplitude and phase errors of the transceiving channels working in a receiving mode canbe implemented through inserting a calibration network constructed based on a six-port receiver, a coupler and a multi-channel switch and the like between a prior transceiving channel of a radar device and a multi-channel antenna and no external variable frequency calibration channel needs to be introduced. The method provided by the invention has a characteristic of real time calibration.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to an amplitude-phase calibration method for multi-channel millimeter-wave radar. Background technique [0002] In the W-band multi-channel dual-polarization radar system, the amplitude and phase inconsistency between the transmitting and receiving channels will not only affect the single-pulse angle measurement performance of the radar, but also have a negative impact on the polarization measurement. When the system is working in the transmitting state, the transmitting signals generated by each transmitting channel radiate to the space through the corresponding antenna sub-arrays, and the power is combined in the space. When there is an amplitude and phase error between the channels, the efficiency of the space power combining will be affected. At the same time, when the system needs to radiate circularly polarized waves, a strict 90° difference between the two transmitt...

Claims

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Application Information

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IPC IPC(8): G01S7/40
CPCG01S7/40
Inventor 肖钰朱凯强罗浩孙厚军
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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