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Broadband near-field measurement system and method for fast calibration of amplitude and phase of radio frequency link

A radio frequency link and broadband technology, applied in the field of broadband near-field measurement systems, can solve the problem of slow scanning data transmission rate, and achieve the effects of fast data transmission speed, simple system structure, and shortened measurement time.

Pending Publication Date: 2021-07-20
SOUTHEAST UNIV
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: to overcome the problem and defect of slow scanning data transmission rate in the prior art, and to provide a method and device for fast amplitude and phase calibration that do not rely on commercial vector network analyzers

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  • Broadband near-field measurement system and method for fast calibration of amplitude and phase of radio frequency link
  • Broadband near-field measurement system and method for fast calibration of amplitude and phase of radio frequency link

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Embodiment Construction

[0034] The method and device for fast amplitude and phase calibration provided by the present invention are not only applicable to phased array radars, but also can be any radio frequency link and antenna whose amplitude or phase needs to be calibrated. Below in conjunction with accompanying drawing, the implementation of technical scheme is described in further detail:

[0035] A broadband near-field measurement circuit for fast amplitude-phase calibration of radio-frequency links, such as figure 1As shown, including broadband phase-locked loop 1, SPDT switch, frequency multiplier 3, amplifier 4, filter 5, adjustable attenuator 6, micro control unit 7, power detector 8, stripline directional coupler 9 , mixer 10, analog-to-digital converter 11, field programmable array 12, host computer 13, power divider 14, transmitting antenna and link 15, receiving antenna and link 16.

[0036] This circuit has the following functions:

[0037] 1. Frequency source for wideband programmab...

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Abstract

The invention discloses a broadband near-field measurement system and method for quickly calibrating the amplitude and the phase of a radio frequency link. The system comprises a mechanical turntable, a system circuit board, an upper computer and an electric displacement platform, the system circuit board is provided with a broadband near-field measurement circuit, the broadband near-field measurement circuit is provided with a transmitting end coupler interface, a receiving end coupler interface and a communication interface, and the receiving end coupler interface and the communication interface are respectively connected with a transmitting antenna and link, a receiving antenna and link and an upper computer; the transmitting antenna and the link are installed on the mechanical rotary table, and the receiving antenna and the link are installed on the electric displacement platform. The broadband near-field measurement circuit comprises a broadband transmitter, a low-intermediate frequency receiver, two couplers and a digital signal processing module. By using the measurement system provided by the invention, the calibration speed of the phased array transceiving channel can be obviously improved.

Description

technical field [0001] The invention relates to the field of phased array radar measurement, in particular to a broadband near-field measurement system and method for rapid calibration of amplitude and phase of radio frequency links. Background technique [0002] In a phased array antenna system, the expected beam scanning can be obtained by adjusting the phase of each antenna element. However, due to the structural error caused by the machining accuracy, the inconsistency of the device itself, and the mutual coupling between the antenna elements, the amplitude and phase of each antenna element are different from the expected value, so that the array performance cannot reach the ideal work. state. Therefore, after the phased array antenna is assembled, it is necessary to perform amplitude and phase calibration to obtain the amplitude and phase difference, and then compensate by adjusting the feed. [0003] At present, the amplitude and phase calibration methods of mainstre...

Claims

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Application Information

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IPC IPC(8): G01S7/40
CPCG01S7/4004Y02D30/70
Inventor 韩涛毛源齐天润董晨琪陈鹏余旭涛
Owner SOUTHEAST UNIV
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