CN104360234A - Linear frequency hopping incoherent detecting passive intermodulation outlier locating method - Google Patents
Linear frequency hopping incoherent detecting passive intermodulation outlier locating method Download PDFInfo
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Abstract
The invention provides a linear frequency hopping incoherent detecting passive intermodulation outlier locating method. A single-frequency signal source and a frequency hopping signal source which are subjected to synchronization are used for synthesizing bi-note testing pulses which are loaded to a tested part to stimulate passive intermodulation interference, the frequency of passive intermodulation interference is frequency corresponding to bi-note signal stimulating, and accordingly fixed-order passive intermodulation interference is a section of frequency hopping pulses. A vector receiver which is subjected to synchronization calibration is used for receiving, an incoherent correlation detecting method is used for detecting a related peak of a pulse reaching moment, accordingly, electrical length locating is completed, and the physical length is computed. The method has the advantages that locating distance range resolution is high, and meanwhile a pulse system is used so that the power supply mode and the size of a system can be improved.
Description
Technical field
The invention belongs to passive intermodulation abnormity point localization method technical field, the passive intermodulation abnormity point localization method of the in particular incoherent coherent detection of a kind of linear frequency hopping pulse.
Background technology
In modern communication systems, linear passive device, as the passive cross modulation test of the devices such as cable, connector, antenna and investigation more and more important, and the localization method of conventional system is generally:
(1) passive cross modulation test instrument produces two-tone signal, enters measured piece through low intermodulation combiner unit;
(2) encourage measured piece to produce passive intermodulation interference, receiver receives this interference;
(3) carry out sweep frequency test, utilize Frequency-time analysis method, calculate the electrical length of passive intermodulation abnormity point position;
(4) propagation coefficient of electrical length and cable is used to locate abnormity point physical length;
The topmost problem of above-mentioned way is the test bandwidth being limited to conventional system, and orientation distance resolution is not high.
Therefore, prior art existing defects, needs to improve.
Summary of the invention
Technical matters to be solved by this invention is for the deficiencies in the prior art, provides a kind of passive intermodulation abnormity point localization method of linear frequency hopping noncoherent detection.
Technical scheme of the present invention is as follows:
A passive intermodulation abnormity point localization method for linear frequency hopping noncoherent detection, comprises the following steps:
Step 1: pure-tone polse signal source, local oscillation signal source and jump frequency coding signal source are provided; Described pure-tone polse signal source produces pure-tone polse signal, and described pure-tone polse signal is fixed frequency signal, and frequency is relevant with the test frequency of tested cable system, and signal representation is s1; Described local vibration source signal source produces local vibration source signal, and described local vibration source signal is fixed frequency signal, and signal representation is L0, and the passive intermodulation signal to be measured that frequency and measured piece produce is relevant, and its frequency-splitting is receiver intermediate frequency; Described jump frequency coding signal source produces Frequency Hopping Signal, and signal representation is s2, frequency be [f1, f2 ..., fn], frequency is determined by test scan frequency;
Step 2: pure-tone polse signal and Frequency Hopping Signal form the high-power two-tone signal of coding through amplifying Hou He road, two-tone signal is loaded on tested cable system by the Tx passage of diplexer, abnormal device in tested cable system produces passive intermodulation undesired signal under the excitation of two-tone signal, and passive intermodulation undesired signal is propagated to both direction; Forward direction passive intermodulation undesired signal and two-tone signal are absorbed by load, and reverse passive intermodulation undesired signal, and the Rx passage through diplexer is received by receiver, complete the excitation of passive intermodulation undesired signal, with being separated of two-tone signal, filtering and reception;
Step 3: by passive intermodulation undesired signal down coversion, sampled by AD, carry out incoherent coherent detection, judges when reflection passive intermodulation undesired signal due in; Incoherent coherent detection be the signal that receives of receiver through the filtering of N road, carry out detection with the N road filtering signal of copy coherent signal respectively, the result of detection is sued for peace after corresponding delay, carries out signal and arrives travel-time relative to copy coherent signal.
The passive intermodulation abnormity point localization method of described linear frequency hopping noncoherent detection, wherein, in described step 1, described pure-tone polse signal source, described local vibration source signal source and described jump frequency coding signal source input signal are provided by frequency reference, and are provided with fractional frequency division unit and multiplier unit respectively.
The passive intermodulation abnormity point localization method of described linear frequency hopping noncoherent detection, wherein, in described step 2, the travel-time is that the two-tone signal of coding is transmitted to abnormity point, and the PIM signal that abnormity point produces is transmitted to the electrical length of receiver.
The passive intermodulation abnormity point localization method of described linear frequency hopping noncoherent detection, wherein, the computing method of described electrical length comprise the following steps:
Steps A: instrument is calibrated, by the tested port of a standard component access instrument, the other end accesses low intermodulation load; To frequency hopping signal generator, the calibration of pure-tone polse source synchronizing chip; Make pulse frequency hopping signal generator only launch simple signal, frequency is f1; Pure-tone polse signal source launches simple signal, and frequency is f2, and 3 rank PIM signal frequencies of so standard component excitation are 2f1-f2; Fix a road impulsive synchronization time delay motionless, provide the calibration range A-B of another impulsive synchronization time delay; Launch two-tone signal testing standard part successively according to the calibration range of synchronization delayed time, receiver receives PIM signal and carries out time frequency analysis, and when PIM time-frequency length is the longest, the corresponding time delay moment thinks that impulsive synchronization is successful;
Step B: plane is tested in foundation and calibrating receiver is synchronous; Testing standard part, incoherent coherent detection is carried out in the PIM pulse of receiver to standard component, and its copy coherent signal is is zero with PIM same frequency, initial phase, Phase Continuation, frequency hopping reference signal that pulsewidth is identical; Now examination criteria part produces the moment of PIM signal is Δ t1, so makes Δ t1 be system reference plane.Under the condition that receiver is synchronously constant, supposing to record the moment that in cable system, PIM abnormity point occurs is Δ t2, and so 0.5* (Δ t2-Δ t1), is the electrical length of abnormity point relative to test port.
Adopt such scheme, use simple signal source, synchronous Guo mono-road, a road frequency hopping signal generator synthesis two tone test pulse, load on the interference of measured piece excitation passive intermodulation, the frequency of passive intermodulation interference should be frequency corresponding to excitation two-tone signal, and therefore the interference of Fixed-order passive intermodulation should be one section of jump frequency coding.The present invention uses the vector receiver crossed through synchronous calibration to receive, and adopts incoherent correlation detection to detect the relevant peaks of pulse due in, thus completes electrical length location, calculates its physical length.The main advantage of the present invention is that orientation distance resolution is high, and simultaneously owing to have employed pulse regime, power supply mode, the volume of system all can improve.
Accompanying drawing explanation
Fig. 1 is the passive cross modulation test method system block diagram of pulse regime of the present invention.
Fig. 2 is Frequency Hopping Signal time domain beamformer of the present invention.
Fig. 3 is Frequency Hopping Signal STFT time-frequency figure of the present invention.
Fig. 4 is Frequency Hopping Signal time-frequency figure of the present invention.
Fig. 5 is the irrelevant relevant Cleaning Principle block diagram of the present invention.
Fig. 6 is the inventive method calibration connection diagram.
Fig. 7 is the present invention's incoherent coherent detection location simulation figure.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
Hardware foundation of the present invention comprises a frequency reference, a pulse frequency hopping signal generator, a pure-tone polse signal source, a local vibration source, two power amplifier modules, a low intermodulation combiner and low inter-modulation duplexer (available triplexer substitutes), a vector receiver (comprising a mixer module, a pulse intermediate frequency conditioning module, AD sampling module, a DSP module), computing machine/FPGA module, three lock units.System chart as shown in Figure 1.
Its principle of work is as follows:
(1) frequency reference (being traditionally arranged to be 50MHz) provides the input of three each and every one source modules, three inner fractional frequency division, multiplier unit respectively with oneself in source.Pure-tone polse signal is fixed frequency signal, and frequency is relevant with the test frequency of tested cable system (measured piece), and signal representation is s1; Local vibration source signal is fixed frequency signal, and signal representation is L0, and passive intermodulation to be measured (PIM) signal that frequency and measured piece produce is relevant, and its frequency-splitting is receiver intermediate frequency; And jump frequency coding signal source produce Frequency Hopping Signal, signal representation is s2, frequency be [f1, f2 ..., fn], frequency is determined by test scan frequency.
Give an example, test frequency range at EGSM, Tx frequency range is 925MHz-960MHz, is test scan frequency range; Rx frequency range is 880MHz-915MHz, for PIM product (signal) receives frequency range.So the frequency of simple signal s1 is 906MHz; Frequency Hopping Signal s2 is set to 7 rank, then frequency is [925,927,929,931,933,935,937] MHz.The 3 rank PIM signals received are [890,894,898,902,906,910,914] MHz, and therefore local oscillator can be set to 880MHz, and intermediate frequency exports as [10,14,18,22,26,30,34] MHz.If pulse is 7 μ s, sample frequency is 3GHz, and so the time domain waveform of Frequency Hopping Signal as shown in Figure 2, and as shown in Figure 3 and Figure 4, Fig. 3 is three-dimensional plot to time-frequency spectrum, and Fig. 4 is vertical view, can see that signal spectrum is along with time saltus step.
(2) pulse signal forms the high-power two-tone signal of coding through amplifying Hou He road, and two-tone signal is loaded on tested cable system by the Tx passage of diplexer.The suggestion of two-tone signal power is 2 road 43dBm (20w).Abnormal device in tested cable system can produce passive intermodulation interference under the excitation of two-tone signal, and passive intermodulation interference will be propagated to both direction.Forward direction PIM signal and two-tone signal are absorbed by load, and reverse PIM signal, and the Rx passage through diplexer is received by receiver, complete the excitation of PIM signal, with being separated of two-tone signal, filtering and reception.
(3) frequency mixing module of receiver is by PIM signal down coversion, is sampled by AD, differentiates, calculates relevant peaks, judge reflected P IM signal due according to irrelevant relevant method of reseptance, and the coherent signal wherein copied is used during calibration by instrument and provides.As shown in Figure 5, incoherent coherent detection is a kind of effective means detecting jump frequency coding relevant peaks to incoherent coherence check method.The signal that receiver receives is through the filtering of N road, and carry out detection with the N road filtering signal of copy coherent signal respectively, the result of detection is sued for peace after corresponding delay, carries out the travel-time of signal arrival relative to copy coherent signal.
(4) travel-time that upper step calculates should be two-tone signal and is transmitted to abnormity point, and the PIM signal that abnormity point produces is transmitted to the electrical length of receiver.In order to calculate this electrical length accurately, the present invention must calibrate instrument, establishes the reference time of copy coherent signal.As shown in Figure 6, a standard component (producing connector that is comparatively large but PIM signal stably) is accessed the tested port of instrument, and the other end accesses low intermodulation load to calibration connection diagram of the present invention.It comprises:
A) to frequency hopping signal generator, the calibration of pure-tone polse source synchronizing chip.This is calibrated to factory calibration, but provides user's calibration interface (calibrating during external trigger).Make pulse frequency hopping signal generator only launch simple signal, frequency is f1; Pure-tone polse signal source launches simple signal, and frequency is f2, and 3 rank PIM signal frequencies of so standard component excitation are 2f1-f2.Fix a road impulsive synchronization time delay motionless, provide the calibration range (A-B) of another impulsive synchronization time delay.Launch two-tone signal testing standard part successively according to the calibration range of synchronization delayed time, receiver receives PIM signal and carries out time frequency analysis, and when PIM time-frequency length is the longest, the corresponding time delay moment thinks that impulsive synchronization is successful.
B) test plane calibrating receiver is synchronous is set up.Testing standard part, incoherent coherent detection is carried out in the PIM pulse of receiver to standard component, and its copy coherent signal is is zero with PIM same frequency, initial phase, Phase Continuation, frequency hopping reference signal that pulsewidth is identical.Now examination criteria part produces the moment of PIM signal is Δ t1, so makes Δ t1 be system reference plane.Under the condition that receiver is synchronously constant, supposing to record the moment that in cable system, PIM abnormity point occurs is Δ t2, and so 0.5* (Δ t2-Δ t1), is the electrical length of abnormity point relative to test port (calibration plane).
If abnormity point is positioned at test port 30m place, Fig. 7 is incoherent coherent detection location simulation result of the present invention, and calibration and test relevant peaks travel-time are spaced apart 0.2 μm, and respective signal propagates one times of the electrical length of 30m, describes the correctness of this method.
Embodiment 2
On the basis of embodiment 1, furthermore, the present invention uses a frequency reference, a pulse frequency hopping signal generator, a pure-tone polse signal source, a local vibration source, two power amplifier modules, a low intermodulation combiner and a low inter-modulation duplexer (available triplexer), a vector receiver (comprising a mixer module, a pulse intermediate frequency conditioning module, AD sampling module, a DSP module), computing machine/FPGA module, three lock units.
Furthermore, frequency reference (being traditionally arranged to be 50MHz) provides the input of three each and every one source modules, three inner fractional frequency division, multiplier unit respectively with oneself in source.Pure-tone polse signal is fixed frequency signal, and frequency is relevant with the test frequency of tested cable system (measured piece), and signal representation is s1; Local vibration source signal is fixed frequency signal, and signal representation is L0, and passive intermodulation to be measured (PIM) signal that frequency and measured piece produce is relevant, and its frequency-splitting is receiver intermediate frequency; And jump frequency coding signal source produce Frequency Hopping Signal, signal representation is s2, frequency be [f1, f2 ..., fn], frequency is determined by test scan frequency.
Furthermore, the high-power two-tone signal of pulse signal after amplifying Hou He road and forming coding, two-tone signal is loaded on by cable system by the Tx passage of diplexer.The suggestion of two-tone signal power is 2 road 43dBm (20w).Abnormal device in tested cable system can produce passive intermodulation interference under the excitation of two-tone signal, and passive intermodulation interference will be propagated to both direction.Forward direction PIM signal and two-tone signal are absorbed by load, and reverse PIM signal, and the Rx passage through diplexer is received by receiver, complete the excitation of PIM signal, with being separated of two-tone signal, filtering and reception.
Furthermore, the frequency mixing module of receiver, by PIM signal down coversion, is sampled by AD, differentiates, calculates relevant peaks, judge reflected P IM signal due according to irrelevant relevant method of reseptance, and the coherent signal wherein copied is used during calibration by instrument and provides.Incoherent coherence check method as shown in Figure 5, the signal that receiver receives is through the filtering of N road, carry out detection with the N road filtering signal of copy coherent signal respectively, the result of detection is sued for peace after corresponding delay, carries out the travel-time of signal arrival relative to copy coherent signal.
In order to calculate this electrical length accurately, the present invention must calibrate instrument, establishes the reference time of copy coherent signal.As shown in Figure 3, a standard component (producing connector that is comparatively large but PIM signal stably) is accessed the tested port of instrument, and the other end accesses low intermodulation load to calibration connection diagram of the present invention.
The present invention sets up test plane and calibrating receiver is synchronous, and measures the abnormal propagation delay relative to calibration end face of test.
Embodiment 3
On the basis of above-described embodiment, the invention provides a kind of passive intermodulation abnormity point localization method of linear frequency hopping noncoherent detection, comprise the following steps:
Step 1: pure-tone polse signal source, local oscillation signal source and jump frequency coding signal source are provided; Described pure-tone polse signal source produces pure-tone polse signal, and described pure-tone polse signal is fixed frequency signal, and frequency is relevant with the test frequency of tested cable system, and signal representation is s1; Described local vibration source signal source produces local vibration source signal, and described local vibration source signal is fixed frequency signal, and signal representation is L0, and the passive intermodulation signal to be measured that frequency and measured piece produce is relevant, and its frequency-splitting is receiver intermediate frequency; Described jump frequency coding signal source produces Frequency Hopping Signal, and signal representation is s2, frequency be [f1, f2 ..., fn], frequency is determined by test scan frequency;
Step 2: pure-tone polse signal and Frequency Hopping Signal form the high-power two-tone signal of coding through amplifying Hou He road, two-tone signal is loaded on tested cable system by the Tx passage of diplexer, abnormal device in tested cable system produces passive intermodulation undesired signal under the excitation of two-tone signal, and passive intermodulation undesired signal is propagated to both direction; Forward direction passive intermodulation undesired signal and two-tone signal are absorbed by load, and reverse passive intermodulation undesired signal, and the Rx passage through diplexer is received by receiver, complete the excitation of passive intermodulation undesired signal, with being separated of two-tone signal, filtering and reception;
Step 3: by passive intermodulation undesired signal down coversion, sampled by AD, carry out incoherent coherent detection, judges when reflection passive intermodulation undesired signal due in; Incoherent coherent detection be the signal that receives of receiver through the filtering of N road, carry out detection with the N road filtering signal of copy coherent signal respectively, the result of detection is sued for peace after corresponding delay, carries out signal and arrives travel-time relative to copy coherent signal.
In described step 1, described pure-tone polse signal source, described local vibration source signal source and described jump frequency coding signal source input signal are provided by frequency reference, and are provided with fractional frequency division unit and multiplier unit respectively.
In described step 2, the travel-time is that the two-tone signal of coding is transmitted to abnormity point, and the PIM signal that abnormity point produces is transmitted to the electrical length of receiver.
The computing method of described electrical length comprise the following steps:
Steps A: instrument is calibrated, by the tested port of a standard component access instrument, the other end accesses low intermodulation load; To frequency hopping signal generator, the calibration of pure-tone polse source synchronizing chip; Make pulse frequency hopping signal generator only launch simple signal, frequency is f1; Pure-tone polse signal source launches simple signal, and frequency is f2, and 3 rank PIM signal frequencies of so standard component excitation are 2f1-f2; Fix a road impulsive synchronization time delay motionless, provide the calibration range A-B of another impulsive synchronization time delay; Launch two-tone signal testing standard part successively according to the calibration range of synchronization delayed time, receiver receives PIM signal and carries out time frequency analysis, and when PIM time-frequency length is the longest, the corresponding time delay moment thinks that impulsive synchronization is successful;
Step B: plane is tested in foundation and calibrating receiver is synchronous; Testing standard part, incoherent coherent detection is carried out in the PIM pulse of receiver to standard component, and its copy coherent signal is is zero with PIM same frequency, initial phase, Phase Continuation, frequency hopping reference signal that pulsewidth is identical; Now examination criteria part produces the moment of PIM signal is Δ t1, so makes Δ t1 be system reference plane.Under the condition that receiver is synchronously constant, supposing to record the moment that in cable system, PIM abnormity point occurs is Δ t2, and so 0.5* (Δ t2-Δ t1), is the electrical length of abnormity point relative to test port.
The present invention uses simple signal source, synchronous Guo mono-road, a road frequency hopping signal generator synthesis two tone test pulse, load on the interference of measured piece excitation passive intermodulation, the frequency of passive intermodulation interference should be frequency corresponding to excitation two-tone signal, and therefore the interference of Fixed-order passive intermodulation should be one section of jump frequency coding.The present invention uses the vector receiver crossed through synchronous calibration to receive, and adopts incoherent correlation detection to detect the relevant peaks of pulse due in, thus completes electrical length location, calculates its physical length.
Advantage of the present invention is that orientation distance resolution is high, and simultaneously owing to have employed pulse regime, power supply mode, the volume of system all can improve.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (4)
1. a passive intermodulation abnormity point localization method for linear frequency hopping noncoherent detection, is characterized in that, comprise the following steps:
Step 1: pure-tone polse signal source, local oscillation signal source and jump frequency coding signal source are provided; Described pure-tone polse signal source produces pure-tone polse signal, and described pure-tone polse signal is fixed frequency signal, and frequency is relevant with the test frequency of tested cable system, and signal representation is s1; Described local vibration source signal source produces local vibration source signal, and described local vibration source signal is fixed frequency signal, and signal representation is L0, and the passive intermodulation signal to be measured that frequency and measured piece produce is relevant, and its frequency-splitting is receiver intermediate frequency; Described jump frequency coding signal source produces Frequency Hopping Signal, and signal representation is s2, frequency be [f1, f2 ..., fn], frequency is determined by test scan frequency;
Step 2: pure-tone polse signal and Frequency Hopping Signal form the high-power two-tone signal of coding through amplifying Hou He road, two-tone signal is loaded on tested cable system by the Tx passage of diplexer, abnormal device in tested cable system produces passive intermodulation undesired signal under the excitation of two-tone signal, and passive intermodulation undesired signal is propagated to both direction; Forward direction passive intermodulation undesired signal and two-tone signal are absorbed by load, and reverse passive intermodulation undesired signal, and the Rx passage through diplexer is received by receiver, complete the excitation of passive intermodulation undesired signal, with being separated of two-tone signal, filtering and reception;
Step 3: by passive intermodulation undesired signal down coversion, sampled by AD, carry out incoherent coherent detection, judges when reflection passive intermodulation undesired signal due in; Incoherent coherent detection be the signal that receives of receiver through the filtering of N road, carry out detection with the N road filtering signal of copy coherent signal respectively, the result of detection is sued for peace after corresponding delay, carries out signal and arrives travel-time relative to copy coherent signal.
2. the passive intermodulation abnormity point localization method of linear frequency hopping noncoherent detection as claimed in claim 1, it is characterized in that, in described step 1, described pure-tone polse signal source, described local vibration source signal source and described jump frequency coding signal source input signal are provided by frequency reference, and are provided with fractional frequency division unit and multiplier unit respectively.
3. the passive intermodulation abnormity point localization method of linear frequency hopping noncoherent detection as claimed in claim 1, it is characterized in that, in described step 2, the travel-time is that the two-tone signal of coding is transmitted to abnormity point, and the PIM signal that abnormity point produces is transmitted to the electrical length of receiver.
4. the passive intermodulation abnormity point localization method of linear frequency hopping noncoherent detection as claimed in claim 1, it is characterized in that, the computing method of described electrical length comprise the following steps:
Steps A: instrument is calibrated, by the tested port of a standard component access instrument, the other end accesses low intermodulation load; To frequency hopping signal generator, the calibration of pure-tone polse source synchronizing chip; Make pulse frequency hopping signal generator only launch simple signal, frequency is f1; Pure-tone polse signal source launches simple signal, and frequency is f2, and 3 rank PIM signal frequencies of so standard component excitation are 2f1-f2; Fix a road impulsive synchronization time delay motionless, provide the calibration range A-B of another impulsive synchronization time delay; Launch two-tone signal testing standard part successively according to the calibration range of synchronization delayed time, receiver receives PIM signal and carries out time frequency analysis, and when PIM time-frequency length is the longest, the corresponding time delay moment thinks that impulsive synchronization is successful;
Step B: plane is tested in foundation and calibrating receiver is synchronous; Testing standard part, incoherent coherent detection is carried out in the PIM pulse of receiver to standard component, and its copy coherent signal is is zero with PIM same frequency, initial phase, Phase Continuation, frequency hopping reference signal that pulsewidth is identical; Now examination criteria part produces the moment of PIM signal is Δ t1, so makes Δ t1 be system reference plane.Under the condition that receiver is synchronously constant, supposing to record the moment that in cable system, PIM abnormity point occurs is Δ t2, and so 0.5* (Δ t2-Δ t1), is the electrical length of abnormity point relative to test port.
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| CN114079519A (en) * | 2020-08-18 | 2022-02-22 | 华为技术有限公司 | Method and device for detecting passive intermodulation fault point |
| CN114079519B (en) * | 2020-08-18 | 2023-01-06 | 华为技术有限公司 | Method and device for detecting passive intermodulation fault point |
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