Identification and positioning method for multiple passive intermodulation generation 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: 2014-12-03
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 an identification and positioning method for multiple passive intermodulation generation points. Under an identical reference signal source, a passive intermodumation reference signal source generates passive intermodulation component reference signals, and signals of two paths of controllable coherent radio frequency signal sources are input into a to-be-detected device after being amplified and combined. The to-be-detected device generates passive intermodulation signals. Through a phase comparator, the phase of the passive intermodulation signals is obtained and then a signal amplitude value is obtained. Input powers are linearly increased so that a new triggering threshold is obtained. An input total power is set as a triggering threshold, and one of input frequencies is changed. One of the input frequencies is changed at identical intervals so that a plurality of groups of data is obtained and then synthesized into a complex signal format. Spacial Fourier transformation is carried out on groups of wave vectors and then through a space domain discrete frequency point string, positioning information of the passive intermodulation generation points is obtained. The identification and positioning method effectively solves a range ambiguity problem brought by phase modulation cycles and adopts linear amplitude modulation and frequency modulation and a spacial Fourier transformation method to realize identification and positioning of the passive intermodulation generation points of the to-be-detected device.
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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Inventor 郑川叶德信冉立新
Owner ZHEJIANG UNIV