Large-scale phased array multi-channel calibration circuit based on distribution mode

Abstract

The invention provides a large-scale phased array multi-channel calibration circuit based on a distribution mode, wherein a calibration circuit generates equal-amplitude in-phase calibration signals,which are transmitted to coupled calibration networks by equal length; each coupled calibration network transmits the received calibration signals to the calibration ports of each X-channel transceiver component by the equal-amplitude in-phase division function by 1:M; the calibration ports are orderly transmitted to all the receiving channels of the components constituting the array through the switch selection and components of 1:X and the coupling effect of couplers of each common channel; each receiving channel obtains the amplitude phase information of all signals by detecting the signalsto realize the amplitude phase calibration of the receiving channel of the array; and the channels of all the components constituting the array are traversed to obtain amplitude phase characteristicsof all the transmitting channels, so as to achieve the amplitude phase alignment of the array emission channels. The circuit reduces the design difficulty and complexity of the coupled calibration network, greatly simplifies the design of the entire calibration circuit, and reduces the complexity of the system.

Description

technical field [0001] The invention relates to a calibration circuit, which is suitable for multi-channel calibration of large-scale active phased array radar. Background technique [0002] Antenna calibration is very important for engineering solid-state active phased arrays. It can be used to regularly check the working status of active antennas and T / R components, and evaluate the performance of active antennas. The purpose of monitoring is to measure active components and compare them with the expected results to judge whether the active channel is good or bad; the purpose of calibration is to make the test results approach the original design intention of the antenna through closed-loop control. [0003] There are many calibration methods for active antennas, mainly including external calibration and internal calibration. Among them, external calibration needs to set up a dedicated calibration antenna and calibration channel outside the array, and the distance from th...

AI Technical Summary

Problems solved by technology

[0004] For large-scale phased array antennas, the conventional coupling-feed calibration circuit is too complicated to implement, and a new calibration circuit is urgently needed to solve the problem of array calibration

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