Active reflection coefficient test system and method of phased array antenna

Abstract

The invention discloses an active reflection coefficient test system and method of a phased array antenna. The test system comprises a vector network analyzer, a multichannel amplitude phase control auxiliary unit, a signal extraction auxiliary unit, a master control computer, a calibration member and an amplitude-stabilizing phase-stabilizing cable, wherein the vector network analyzer is configured to generate test excitation signals and receive reference, reflection and monitoring signals; the multichannel amplitude phase control auxiliary unit is configured to convert one path of excitation signals into M paths, control the amplitudes and phases of the M paths of signals independently, and output M paths of amplitude and phase controllable excitation signals; and the signal extraction auxiliary unit is configured to realize straight-through output of the M paths of amplitude and phase controllable excitation signals, carry out reference coupling, monitoring coupling and reflection coupling extraction on the M paths of amplitude and phase controllable excitation signals, and implement switching control and selective output. The test system can directly test the active reflection coefficient of the antenna unit needless of calculation, the test process is concise, manual operation is less, and the test result is highly correct.

Description

technical field [0001] The invention relates to a phased array antenna active reflection coefficient testing system and method. Background technique [0002] With the development of phased array radar, phased array antenna has been widely used due to its advantages of various feeding methods, flexible beam control, and fast scanning speed. When the phased array antenna is working, the combination of different amplitude and phase feeds of multiple antenna elements is used to realize beamforming and pointing control. This working mode brings the following problems: [0003] (1) Because the antenna units at the front end of the array are relatively close, the electromagnetic mutual coupling effect between them will affect the antenna impedance, thereby reducing the performance of the entire antenna array; (2) In the actual working state of the phased array antenna, the antenna array exists A variety of feeding methods of amplitude and phase combinations, different feeding met...

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Problems solved by technology

[0010] (1) The test cannot reflect the actual working state of the phased array antenna. Only one antenna unit is in the feeding state at a certain moment during the test, which is inconsistent with the simultaneous feeding state of the phased array antenna unit. The test results cannot truthfully reflect the actual state of the antenna array (2) A large number of mutual coupling parameter tests need to be completed to obtain the active reflection coefficient of each antenna unit. The test connection work is cumbersome, the workload is heavy, and the test efficiency is low. For large-scale phase control (3) The above method cannot realize the amplitude-phase conversion control of multi-channel feed excitation signals, and cannot effectively reflect the active reflection coefficient of the phased array antenna under different excitation and feed states.

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