A method for identifying and locating multiple passive intermodulation occurrence points
A passive intermodulation and positioning method technology, which is applied in the field of passive intermodulation identification and positioning, can solve problems such as distance ambiguity, and achieve the effect of solving distance ambiguity problems
Active Publication Date: 2017-09-29
ZHEJIANG UNIV
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The method of the invention adopts the method of linear amplitude modulation and frequency modulation and Fourier transform in the space domain to realize the identification and positioning of the passive intermodulation point of the device to be tested, effectively solves the distance ambiguity problem caused by the periodicity of the phase modulation, and realizes the complex practical system. PIM identification and location
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[0025] Such as figure 1 Shown, the present invention comprises the following steps:
[0026] 1) Two controllable coherent radio frequency signal sources and one passive intermodulation reference signal source share the same reference signal source, and the two controllable coherent radio frequency signal sources respectively generate single-frequency controllable coherent radio frequency signals as the transmitter, and the frequencies are respectively f 1 , f 2 , the signals emitted by two controllable coherent radio frequency signal sources are injected into the device under test after being amplified and combined; when the total power of the injected two-way signals is greater than the trigger threshold of the device under test, the passive intermodulation signal is generated by excitation; The source intermodulation reference signal source generates the passive intermodulation component reference signal, and the frequency of the passive intermodulation component reference...
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The invention discloses a method for identifying and locating multiple passive intermodulation occurrence points. Under the same reference signal source, the passive intermodulation reference signal source generates the passive intermodulation component reference signal, and the two controllable coherent RF signal sources are injected into the device under test after being amplified and combined, and the device under test generates a passive intermodulation signal ; Obtain the phase of the passive intermodulation signal through the phase comparator, and calculate the signal amplitude value; linearly increase the input power to obtain a new trigger threshold; set the total input power as the trigger threshold, and change one of the input frequencies; By changing one of the input frequencies, multiple sets of data are obtained to synthesize a complex signal form, and the space Fourier transform is performed on each set of wave vectors, and the location information of its occurrence point is obtained through the discrete frequency point string in the space domain. The invention effectively solves the distance ambiguity problem caused by phase modulation periodicity, adopts the method of linear amplitude modulation and frequency modulation, and space domain Fourier transform to realize the identification and positioning of the passive intermodulation occurrence point of the device to be tested.
Description
technical field [0001] The invention relates to a passive intermodulation identification and positioning method, in particular to an identification and positioning method for multiple passive intermodulation occurrence points. Background technique [0002] With the continuous and rapid development of my country's wireless communication technology, high power capacity, broadband, and multi-carrier technology have become the only choice for future advanced communication systems. In high-power multi-channel communication systems (such as satellite communication systems and mobile communication networks), due to the limited space of high-power transmitters and high-sensitivity receivers, a source of interference that must be suppressed—passive intermodulation ( PIM), which is formed by the linear combination product of the basic signal frequency generated when two or more transmitting carriers meet in a passive device and falls within the receiving passband. In a modern communi...
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IPC IPC(8): H04W64/00
Inventor 郑川叶德信冉立新
Owner ZHEJIANG UNIV