A near-field frequency sweep test system and test method for a frequency-variable antenna

Abstract

The invention provides a frequency conversion antenna near field frequency sweeping testing system and a testing method thereof. The system comprises a testing signal source, a coupling module, a testing channel, a reference channel, a receiver and a controlling computer. The testing channel comprises a transmitting module, a to-be-tested frequency conversion antenna, a second frequency mixing module and a third frequency mixing module. The second frequency mixing module in the testing channel performs frequency conversion on multiple frequency point signals output by the to-be-tested frequency conversion antenna; local signals of the second frequency mixing module are selected in sequence according to a predetermined frequency list, and the frequency of the local signal is changed when a trigger signal is received each time, so that time shared test of the output signal of each frequency point antenna is realized; and each time the frequency of an output signal of one frequency point is converted into the frequency band of a radio frequency transmitting signal, then the local signal the same as a reference module is adopted for down conversion so as to obtain a middle frequency reference signal and a middle frequency testing signal for phase comparison and amplitude comparison. Through adoption of the method, phases of link signals can be guaranteed to be consistent, the plane near field rapid frequency sweeping testing function of the frequency conversion antenna is realized, and the test efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of antenna testing, in particular to a near-field frequency sweep testing system and a testing method for frequency-variable antennas. Background technique [0002] With the development of aerospace technologies such as mobile communication satellites, the requirements for the function and performance of the antenna are getting higher and higher. Antenna testing technology can no longer meet the requirements of satellite antenna testing. A variable-frequency multi-beam antenna has an effective antenna diameter of more than 10 meters, forming hundreds of national land point beams to cover the national land, and frequency reuse. During the test, the entrance frequency of the antenna is inconsistent with the frequency radiated into the space. It cannot be realized by using the traditional antenna plane near-field test method. [0003] Through investigation, it is known that no unit in China has conducted near...

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Problems solved by technology

Using traditional antenna plane near-field test methods, it is impossible to achieve

[0003] Through research, it is known that no domestic unit has conducted near-field frequency sweep tests of frequency-variable multi-beam antennas, and there is no ready-made frequency-variable antenna fast near-field test system available for purchase in China.

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