Vector measurement method for passive intermodulation interference

Abstract

The invention provides a vector measurement method for passive intermodulation interference. The vector measurement method for the passive intermodulation interference comprises the steps that firstly a computer module adjusts the output frequency of a frequency reference unit, and a frequency reference signal is output; the frequency reference signal is used by a first signal source, a second signal source and a local oscillator source module after power division is conducted on the frequency reference signal, and then a testing signal with a frequency F1, a testing signal with a frequency F2 and a local oscillator signal L0 are generated; a part of the testing signal F1 and a part of the testing signal F2 are amplified by an amplifier module after power division is conducted on the testing signal F1 and the testing signal F2, then the signals are combined to generate a +43dBm dual-tone signal used for testing, reciprocal mixing is conducted on the other part of the testing signal F1 and the other part of the testing signal F2 after the other part of the testing signal F1 and the other part of the testing signal F2 pass through a frequency multiplication module, the frequency of an obtained signal is 2F1-F2 after filtering, and the signal is received by a reference receiver to serve as a PIM reference signal. By the adoption of the vector measurement method for the passive intermodulation interference, self-intermodulation and self-calibration of an instrument can be achieved, vector compensation for the self-intermodulation of the instrument can be achieved, the self-intermodulation of a system is greatly reduced, the measurement range of the system is widened, and the uncertainty of measurement is reduced; the time-frequency conversion technology can be directly adopted by a measurement result, and the time domain response to a PIM product can be observed.

Description

technical field [0001] The invention belongs to the technical field of vector measurement of passive intermodulation interference, and in particular relates to a vector measurement method of passive intermodulation interference. Background technique [0002] At present, the PIM test solution including most companies is a scalar measurement method, which only measures the PIM interference power of the measured order. The solution similar to the PIM interference vector measurement is to use the fault location module, and the measurement phase will measure The result is converted to the time domain, but this is not a true vector measurement for the following reasons: [0003] 1. The main receiver is still a scalar measurement, which only measures the power of PIM interference, and the final measurement result does not give phase information. [0004] 2. The phase measurement depends on the receiver of the front-end module of the measuring instrument, and does not pass through ...

AI Technical Summary

Problems solved by technology

So the measurement can give the phase difference of the PIM interference with respect to the port, but cannot achieve the calibration of the intermodulation itself

[0005] In summary, there is no real vector measurement method at present, and there is no technology to calibrate or suppress the intermodulation of the instrument itself

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