Fast calibration method for active phase array radar

Abstract

The invention discloses a fast calibration method for an active phase array radar. The fast calibration method comprises the steps that a microwave signal in an emitting channel of the active phase array radar is converted into an intermediate-frequency signal through an oscillation signal, A / D sampling and orthogonal digital frequency mixing are carried out on the intermediate-frequency signal, and the signal obtained after frequency mixing is converted into a linear frequency-modulated signal through low-pass filtering; the delay time between the linear frequency-modulated signal in the emitting channel and a reference signal is obtained; the amplitude and phase of the linear frequency-modulated signal in the channel are calibrated through calibration of the amplitude and phase of a predefined carrier frequency signal. The systematized emitting channel fast calibration method is provided for the active phase array radar, the real-time performance of the calibration process and robustness of the calibration result are guaranteed, and the method is suitable for being applied to engineering.

Description

technical field [0001] The invention relates to the field of radar and measurement and control, in particular to a method for fast calibration of an active phased array radar. Background technique [0002] The phased array antenna is the abbreviation of the phase control array antenna, that is, the antenna is composed of multiple radiating elements. Through the beam forming network, the amplitude and phase of the radio frequency signal fed into each radiating element of the phased array antenna can be precisely controlled, so as to flexibly control the phase. The field distribution of electromagnetic waves on the control array surface enables the field of electromagnetic waves to synthesize a specific beam in space to achieve the purpose of scheduling and controlling the direction of the phased array antenna beam. Since the active phased array antenna has many advantages such as beam agility, fast scanning, and multi-beam forming, with the development of new technologies and...

AI Technical Summary

Problems solved by technology

During the operation of the active phased array radar, many reasons need to use the online self-calibration method: after a long period of operation, due to the aging of the device itself and the influence of the environment, the initial parameters of the channel deviate from the state when it leaves the factory. If you continue to use The factory data is used as a reference, which will lead to the performance degradation of the radar and needs to be recalibrated. The existing calibration method is not only time-consuming, but also has no systematic method suitable for engineering applications, which directly affects the work and performance of the system.

[0003] Therefore, for the above-mentioned problems existing in related technologies, effective solutions have not yet been proposed

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