A device and method for real-time calibration of transmission phase based on four-element directional antenna

Abstract

The invention discloses a launch phase real-time calibrating device and a method based on four unit directional antennas. Calibrating source signals are divided into four ways of calibrating signals by a power divider in the device; the calibrating signals are respectively sent to four launch channels; the four launch channels are respectively connected with four transmit-receive switches correspondingly; the four transmit-receive switches are respectively connected to the four unit directional antennas; simultaneously the four transmit-receive switches are respectively connected with a matrix switch through four receiving channels; and the matrix switch is connected with a phase comparator. The method is characterized in that through launching the calibrating source signals by two channels, receiving the calibrating signals by two channels, and comparing the phase difference of two ways of received signals, the phase relationship between two launch channels is obtained. The device and method provided by the invention can be widely used for a system which has real-time calibrating requirements from each port phase in wave beam formation, such as an airborne collision avoidance system and an antenna system with symmetrical property, and the system has the advantages of obvious market prospect and economic benefits.

Description

technical field [0001] The invention relates to antenna and cable transmission phase calibration technology, in particular to a real-time calibration device and a corresponding calibration method based on a four-unit directional antenna transmission phase. Background technique [0002] A TCAS directional antenna generally consists of four omnidirectional antenna elements. The TCAS system forms four directional beams with a beam width slightly greater than 90 degrees by adding corresponding transmit phases to the four antenna ports, and divides the space into four blocks to meet its system requirements. [0003] The 4 antenna ports are connected to 4 cables. Due to cable length errors and system errors, the transmission phase of each port will deviate, resulting in wrong beam pointing and the system cannot work normally. At this time, the system error needs to be corrected. [0004] Furthermore, when the antenna cable is replaced, temperature, time, cable damage, etc., all ...

AI Technical Summary

Problems solved by technology

[0003] The 4 antenna ports are connected with 4 cables. Due to the cable length error and system error, the transmission phase of each port will deviate, which will lead to the wrong beam pointing and the system cannot work normally.

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