CN104360234B - A kind of abnormal independent positioning method of the passive intermodulation of linear frequency hopping noncoherent detection - Google Patents
A kind of abnormal independent positioning method of the passive intermodulation of linear frequency hopping noncoherent detection Download PDFInfo
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Abstract
The present invention provides a kind of passive intermodulation of linear frequency hopping noncoherent detection abnormal independent positioning method, using the synchronous source of simple signal all the way crossed, frequency hopping signal generator synthesizes two tone test pulse all the way, load on measured piece excitation passive intermodulation interference, the frequency of passive intermodulation interference should be the corresponding frequency of excitation two-tone signal, therefore the interference of Fixed-order passive intermodulation should be one section of jump frequency coding.The present invention is received using the vector receiver crossed by synchronous calibration, and the relevant peaks of pulse due in are detected using incoherent correlation detection, so as to complete electrical length positioning, calculates its physical length.The method have the advantages that orientation distance high resolution, simultaneously because employing pulse regime, power supply mode, the volume of system can be improved.
Description
Technical field
The invention belongs to passive intermodulation exception independent positioning method technical field, more particularly to a kind of linear frequency hopping pulse
The passive intermodulation exception independent positioning method of incoherent coherent detection.
Background technology
In modern communication systems, linear passive device, such as cable, connector, the passive cross modulation test of antenna device
It is more and more important with investigating, and the localization method of conventional system is generally：
(1) passive cross modulation test instrument produces two-tone signal, and measured piece is entered through low intermodulation combiner unit；
(2) excitation measured piece produces passive intermodulation interference, and receiver receives this interference；
(3) frequency test is scanned, using Frequency-time analysis method, the electrical length of passive intermodulation abnormity point position is calculated；
(4) using the propagation coefficient positioning abnormity point physical length of electrical length and cable；
The above-mentioned topmost problem of way is limited to the test bandwidth of conventional system, and orientation distance resolution ratio is not high.
Therefore, the prior art is defective, it is necessary to improve.
The content of the invention
The technical problems to be solved by the invention are directed to the deficiencies in the prior art, there is provided a kind of incoherent inspection of linear frequency hopping
The passive intermodulation exception independent positioning method of survey.
Technical scheme is as follows：
A kind of abnormal independent positioning method of the passive intermodulation of linear frequency hopping noncoherent detection, comprises the following steps：
Step 1：Pure-tone pulse signal source, local oscillation signal source and jump frequency coding signal source are provided；The pure-tone pulse signal
Source produces pure-tone pulse signal, and the pure-tone pulse signal is fixed frequency signal, and the test of frequency and tested cable system is frequently
Rate is relevant, and signal representation is s1；The local vibration source signal source produces local oscillator source signal, the local oscillator source signal to believe for fixed frequency
Number, signal representation is L0, and frequency is relevant with the passive intermodulation signal to be measured that measured piece is produced, and its frequency-splitting is in receiver
Frequently；The jump frequency coding signal source produces Frequency Hopping Signal, and signal representation is s2, and frequency is [f1, f2 ..., fn], and frequency is by surveying
Examination scan frequency determines；
Step 2：Pure-tone pulse signal and Frequency Hopping Signal form the high-power two-tone signal of coding by combining after amplification, double
Message number is loaded onto tested cable system by the Tx passages of duplexer, is tested the abnormal device in cable system in two-tone signal
Excitation is lower to produce passive intermodulation interference signal, passive intermodulation interference signal to be propagated to both direction；Forward direction passive intermodulation interference letter
Number and two-tone signal by load absorption, and reversely passive intermodulation interference signal is received by the Rx passages of duplexer by receiver,
Complete excitation, the separation with two-tone signal, filtering and the reception of passive intermodulation interference signal；
Step 3：By passive intermodulation interference signal down coversion, sampled by AD, carry out incoherent coherent detection, judged when reflection
Passive intermodulation interference signal due in；The signal that incoherent coherent detection is received for receiver is filtered by N roads, respectively and
Copying the N roads filtering signal of coherent signal carries out detection, and the result of detection carries out signal and reach phase by being sued for peace after corresponding delay
For the propagation time for copying coherent signal.
The passive intermodulation exception independent positioning method of described linear frequency hopping noncoherent detection, wherein, in the step 1, institute
Pure-tone pulse signal source, the local vibration source signal source and the jump frequency coding signal source input signal is stated to be provided by frequency reference,
And respectively it is provided with fractional frequency division unit and multiplier unit.
The abnormal independent positioning method of the passive intermodulation of described linear frequency hopping noncoherent detection, wherein, in the step 2, pass
Two-tone signal between sowing time for coding propagates to abnormity point, and the PIM signals that abnormity point is produced propagate to the electrical length of receiver.
The abnormal independent positioning method of the passive intermodulation of described linear frequency hopping noncoherent detection, wherein, the meter of the electrical length
Calculation method is comprised the following steps：
Step A：Instrument is calibrated, standard component access instrument is tested port, the other end accesses low intermodulation load；
To frequency hopping signal generator, the calibration of pure-tone pulse source synchronizing chip；Pulse frequency hopping signal generator is made only to launch simple signal, frequency is f1；
Pure-tone pulse signal source launches simple signal, and frequency is f2, then 3 rank PIM signal frequencies of standard component excitation are 2f1-f2；Gu
Fixed impulsive synchronization time delay all the way is motionless, provides the calibration range A-B of another impulsive synchronization time delay；According to the calibration model of synchronization delayed time
Transmitting two-tone signal testing standard part successively is enclosed, receiver receives PIM signals and carries out time frequency analysis, when PIM time-frequency length is most long
When the corresponding time delay moment think impulsive synchronization success；
Step B：Set up test plane and calibrate receiver synchronization；Testing standard part, PIM pulse of the receiver to standard component
Incoherent coherent detection is carried out, it with PIM same frequencys, initial phase is identical zero, Phase Continuation, pulsewidth that its copy coherent signal is
Frequency hopping reference signal；It is Δ t1 that now examination criteria part produces the moment of PIM signals, then make Δ t1 flat for system reference
Face.Under conditions of receiver is synchronously constant, it is assumed that the moment for measuring PIM abnormity points appearance in cable system is Δ t2, then
0.5* (Δ t2- Δ t1), as electrical length of the abnormity point relative to test port.
Using such scheme, using the synchronous source of simple signal all the way crossed, frequency hopping signal generator synthesizes two tone test arteries and veins all the way
Punching, loads on measured piece excitation passive intermodulation interference, and the frequency of passive intermodulation interference should be the corresponding frequency of excitation two-tone signal,
Therefore Fixed-order passive intermodulation interference should be one section of jump frequency coding.The present invention is entered using the vector receiver crossed by synchronous calibration
Row is received, and the relevant peaks of pulse due in are detected using incoherent correlation detection, so as to complete electrical length positioning, calculates it
Physical length.The main advantage of the present invention is orientation distance high resolution, simultaneously because pulse regime is employed, the power supply of system
Mode, volume can be improved.
Brief description of the drawings
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 figures 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 that the inventive method calibrates connection diagram.
Fig. 7 is incoherent coherent detection location simulation figure of the invention.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
The hardware foundation of the present invention includes frequency reference, pulse frequency hopping signal generator, a pure-tone pulse signal
Source, local vibration source, two power amplifier modules, a low mutual tunable combiner and a low inter-modulation duplexers (can be replaced with triplexer
Generation), vector receiver (including mixer module, pulse intermediate frequency conditioning module, AD sampling modules, one
Individual DSP module), computer/FPGA module, three synchronization units.System block diagram is as shown in Figure 1.
Its operation principle is as follows：
(1) frequency reference (being traditionally arranged to be 50MHz) provides three inputs of source module, has respectively inside three sources
The fractional frequency division of oneself, multiplier unit.Pure-tone pulse signal is fixed frequency signal, frequency and tested cable system (measured piece)
Test frequency it is relevant, signal representation is s1；Local oscillator source signal is fixed frequency signal, and signal representation is L0, frequency and tested
Passive intermodulation to be measured (PIM) signal that part is produced is relevant, and its frequency-splitting is receiver intermediate frequency；And jump frequency coding signal source is produced
Frequency Hopping Signal, signal representation is s2, and frequency is [f1, f2 ..., fn], and frequency is determined by test scan frequency.
For example, frequency range is tested in EGSM, Tx frequency ranges are 925MHz-960MHz, for test scanning band；Rx frequency ranges are
880MHz-915MHz, is that PIM products (signal) receive frequency range.So the frequency of simple signal s1 is 906MHz；Frequency Hopping Signal s2
7 ranks are set to, then frequency is [925,927,929,931,933,935,937] MHz.The 3 rank PIM signals received for [890,
894,898,902,906,910,914] MHz, therefore local oscillator may be configured as 880MHz, intermediate frequency be output as [10,14,18,22,26,
30,34] MHz.If pulse is 7 μ s, sample frequency is 3GHz, then the time domain waveform of Frequency Hopping Signal is as shown in Fig. 2 time-frequency
As shown in Figure 3 and Figure 4, Fig. 3 is graphics to spectrum, and Fig. 4 is top view, it can be seen that signal spectrum is saltus step over time.
(2) pulse signal forms the high-power two-tone signal of coding by combining after amplification, and two-tone signal is by duplexer
Tx passages are loaded onto tested cable system.The suggestion of two-tone signal power is 2 road 43dBm (20w).Exception in tested cable system
Device can produce passive intermodulation to disturb 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 by load absorption, and reversely PIM signals, received by receiver by the Rx passages of duplexer, complete PIM
The excitation of signal is separated with two-tone signal, filters and received.
(3) frequency mixing module of receiver samples, according to irrelevant relevant method of reseptance PIM signal down coversions by AD
Differentiate, calculate relevant peaks, judge reflected P IM signal due ins, wherein the coherent signal for copying is carried by instrument using when calibrating
For.Incoherent coherence check method is as shown in figure 5, incoherent coherent detection is a kind of effective hand for detecting jump frequency coding relevant peaks
Section.The signal that receiver is received is filtered by N roads, and the N roads filtering signal with copy coherent signal carries out detection, detection respectively
Result by after corresponding delay sue for peace, carry out signal reach relative to copy coherent signal propagation time.
(4) propagation time that calculating is walked on should be two-tone signal and propagate to abnormity point, and the PIM signals that abnormity point is produced are propagated
To the electrical length of receiver.In order to accurately calculate this electrical length, the present invention must be calibrated to instrument, establish copy phase
The reference time of OFF signal.Calibration connection diagram of the invention is as shown in fig. 6, a standard component (is produced larger but stable
The connector of PIM signals) the tested port of instrument is accessed, the other end accesses low intermodulation load.It includes：
A) frequency hopping signal generator, pure-tone pulse source synchronizing chip are calibrated.This is calibrated to factory calibration, but provides user calibration
Interface (is calibrated) during external trigger.Pulse frequency hopping signal generator is made only to launch simple signal, frequency is f1；Pure-tone pulse signal source is launched
Simple signal, frequency is f2, then 3 rank PIM signal frequencies of standard component excitation are 2f1-f2.Fixed impulsive synchronization time delay all the way
It is motionless, provide the calibration range (A-B) of another impulsive synchronization time delay.Calibration range according to synchronization delayed time launches double-tone letter successively
Number testing standard part, receiver receives PIM signals and carries out time frequency analysis, the corresponding time delay moment when PIM time-frequency length is most long
Think impulsive synchronization success.
B) set up test plane and calibrate receiver synchronization.Testing standard part, PIM pulse of the receiver to standard component is carried out
Incoherent coherent detection, its copy coherent signal be with PIM same frequencys, initial phase be zero, Phase Continuation, pulsewidth identical jump
Frequency reference signal.It is Δ t1 that now examination criteria part produces the moment of PIM signals, then it is system reference plane to make Δ t1.
Under conditions of receiver is synchronously constant, it is assumed that it is Δ t2 to measure the moment that PIM abnormity points in cable system occur, then 0.5*
(Δ t2- Δ t1), as electrical length of the abnormity point relative to test port (calibration plane).
If abnormity point is located at test port 30m, Fig. 7 is incoherent coherent detection location simulation result of the invention, school
The accurate and test relevant peaks propagation time, propagate induction signal 30m electrical length one times illustrated this method at intervals of 0.2 μm
Correctness.
Embodiment 2
On the basis of embodiment 1, furthermore, the present invention uses frequency reference, a pulse Frequency Hopping Signal
Source, a pure-tone pulse signal source, a local vibration source, two power amplifier modules, a low mutual tunable combiner and a low intermodulation are double
Work device (triplexer can be used), vector receiver (including mixer module, pulse intermediate frequency conditioning module, one
AD sampling modules, a DSP module), computer/FPGA module, three synchronization units.
Furthermore, frequency reference (being traditionally arranged to be 50MHz) is provided inside the input of three source modules, three sources
There is oneself fractional frequency division, multiplier unit respectively.Pure-tone pulse signal is fixed frequency signal, frequency and tested cable system
The test frequency of (measured piece) is relevant, and signal representation is s1；Local oscillator source signal is fixed frequency signal, and signal representation is L0, frequency
Rate is relevant with passive intermodulation to be measured (PIM) signal that measured piece is produced, and its frequency-splitting is receiver intermediate frequency；And jump frequency coding is believed
Number source produces Frequency Hopping Signal, and signal representation is s2, and frequency is [f1, f2 ..., fn], and frequency is determined by test scan frequency.
Furthermore, the pulse signal high-power two-tone signal that combining is formed after coding after amplification, two-tone signal
It is loaded onto by cable system by the Tx passages of duplexer.The suggestion of two-tone signal power is 2 road 43dBm (20w).Tested cable system
In abnormal device passive intermodulation can be produced to disturb under the excitation of two-tone signal, passive intermodulation interference will be passed to both direction
Broadcast.Forward direction PIM signals and two-tone signal are by load absorption, and reversely PIM signals, connect by receiver by the Rx passages of duplexer
Receive, the excitation for completing PIM signals is separated with two-tone signal, filters and received.
Furthermore, the frequency mixing module of receiver samples, according to irrelevant relevant PIM signal down coversions by AD
Method of reseptance differentiates, calculates relevant peaks, reflected P IM signal due ins is judged, wherein the coherent signal copied is used by instrument
There is provided during calibration.Incoherent coherence check method respectively and is copied as shown in figure 5, the signal that receives of receiver is filtered by N roads
The N roads filtering signal of shellfish coherent signal carries out detection, and the result of detection is summed after corresponding delay, carries out signal and reaches relative
In the propagation time of copy coherent signal.
In order to accurately calculate this electrical length, the present invention must be calibrated to instrument, establish copy coherent signal
Reference time.Calibration connection diagram of the invention by a standard component as shown in fig. 6, (produce larger but stable PIM signals
Connector) the tested port of access instrument, the low intermodulation load of other end access.
The present invention sets up test plane and calibrates receiver synchronization, and determines the abnormal biography relative to calibration end face of test
Sowing time prolongs.
Embodiment 3
On the basis of above-described embodiment, the present invention provides a kind of passive intermodulation abnormity point of linear frequency hopping noncoherent detection
Localization method, comprises the following steps：
Step 1：Pure-tone pulse signal source, local oscillation signal source and jump frequency coding signal source are provided；The pure-tone pulse signal
Source produces pure-tone pulse signal, and the pure-tone pulse signal is fixed frequency signal, and the test of frequency and tested cable system is frequently
Rate is relevant, and signal representation is s1；The local oscillation signal source produces local oscillator source signal, the local oscillator source signal to believe for fixed frequency
Number, signal representation is L0, and frequency is relevant with the passive intermodulation signal to be measured that measured piece is produced, and its frequency-splitting is in receiver
Frequently；The jump frequency coding signal source produces Frequency Hopping Signal, and signal representation is s2, and frequency is [f1, f2 ..., fn], and frequency is by surveying
Examination scan frequency determines；
Step 2：Pure-tone pulse signal and Frequency Hopping Signal form the high-power two-tone signal of coding by combining after amplification, double
Message number is loaded onto tested cable system by the Tx passages of duplexer, is tested the abnormal device in cable system in two-tone signal
Excitation is lower to produce passive intermodulation interference signal, and passive intermodulation interference signal is propagated to both direction；Forward direction passive intermodulation interference letter
Number and two-tone signal by load absorption, and reversely passive intermodulation interference signal is received by the Rx passages of duplexer by receiver,
The excitation for completing passive intermodulation interference signal is separated with two-tone signal, filters and received；
Step 3：By passive intermodulation interference signal down coversion, sampled by AD, carry out incoherent coherent detection, judged when reverse
Passive intermodulation interference signal due in；The signal that incoherent coherent detection is received for receiver is filtered by N roads, respectively and
Copying the N roads filtering signal of coherent signal carries out detection, and the result of detection carries out signal and reach phase by being sued for peace after corresponding delay
Propagation time for copying coherent signal.
In the step 1, the pure-tone pulse signal source, the local vibration source signal source and the jump frequency coding signal source are defeated
Enter signal to be provided by frequency reference, and be respectively provided with fractional frequency division unit and multiplier unit.
In the step 2, the propagation time is that the two-tone signal of coding propagates to abnormity point, the PIM signals that abnormity point is produced
Propagate to the electrical length of receiver.
The computational methods of the electrical length are comprised the following steps：
Step A：Instrument is calibrated, standard component access instrument is tested port, the other end accesses low intermodulation load；
To jump frequency coding signal source, the calibration of pure-tone pulse signal source synchronizing chip；Jump frequency coding signal source is made only to launch simple signal, frequency
Rate is f1；Pure-tone pulse signal source launch simple signal, frequency is f2, then standard component excitation 3 rank PIM signal frequencies be
2f1-f2；Fixed impulsive synchronization time delay all the way is motionless, provides the calibration range A-B of another impulsive synchronization time delay；According to it is synchronous when
The calibration range prolonged launches two-tone signal testing standard part successively, and receiver receives PIM signals and carries out time frequency analysis, as PIM
Frequency length when most long the corresponding time delay moment think impulsive synchronization success；
Step B：Set up test plane and calibrate receiver synchronization；Testing standard part, PIM pulse of the receiver to standard component
Incoherent coherent detection is carried out, it with PIM same frequencys, initial phase is identical zero, Phase Continuation, pulsewidth that its copy coherent signal is
Frequency hopping reference signal；It is Δ t1 that now examination criteria part produces the moment of PIM signals, then make Δ t1 flat for system reference
Face.Under conditions of receiver is synchronously constant, it is assumed that the moment for measuring PIM abnormity points appearance in cable system is Δ t2, then
0.5* (Δ t2- Δ t1), as electrical length of the abnormity point relative to test port.
The present invention is using the synchronous source of simple signal all the way crossed, frequency hopping signal generator synthesis two tone test pulse, loading all the way
In measured piece excitation passive intermodulation interference, the frequency of passive intermodulation interference should be the corresponding frequency of excitation two-tone signal, therefore solid
Determine the interference of rank passive intermodulation and should be one section of jump frequency coding.The present invention is connect using the vector receiver crossed by synchronous calibration
Receive, the relevant peaks of pulse due in are detected using incoherent correlation detection, so as to complete electrical length positioning, calculate its physics
Length.
The method have the advantages that orientation distance high resolution, simultaneously because pulse regime is employed, the power supply mode of system, body
Product can be improved.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (1)
1. a kind of linear frequency hopping noncoherent detection passive intermodulation exception independent positioning method, it is characterised in that comprise the following steps：
Step 1：Pure-tone pulse signal source, local oscillation signal source and jump frequency coding signal source are provided；The pure-tone pulse signal source is produced
Raw pure-tone pulse signal, the pure-tone pulse signal is fixed frequency signal, and the test frequency of frequency and tested cable system has
Close, signal representation is s1；The local oscillation signal source produces local oscillator source signal, and the local oscillator source signal is fixed frequency signal, letter
Number L0 is expressed as, frequency is relevant with the passive intermodulation signal to be measured that measured piece is produced, its frequency-splitting is receiver intermediate frequency；It is described
Jump frequency coding signal source produces Frequency Hopping Signal, and signal representation is s2, and frequency is [f1, f2 ..., fn], and frequency is by test scanning frequency
Rate is determined；
Step 2：The combining after amplification of pure-tone pulse signal and Frequency Hopping Signal forms the high-power two-tone signal of coding, double-tone letter
Number tested cable system is loaded onto by the Tx passages of duplexer, is tested excitation of the abnormal device in cable system in two-tone signal
Lower generation passive intermodulation interference signal, passive intermodulation interference signal is propagated to both direction；Forward direction passive intermodulation interference signal and
Two-tone signal is by load absorption, and reversely passive intermodulation interference signal, received by receiver by the Rx passages of duplexer, complete
The excitation of passive intermodulation interference signal, the separation with two-tone signal, filtering and reception；
Step 3：By passive intermodulation interference signal down coversion, sampled by AD, carry out incoherent coherent detection, judge reversely passive mutual
Interference signal due in is adjusted, incoherent coherent detection is filtered for the signal that receiver is received by N roads, respectively with copy phase
The N roads filtering signal of OFF signal carries out detection, and the result of detection carries out calculating signal arrival relatively by being sued for peace after corresponding delay
In the propagation time of copy coherent signal；In the step 1, the pure-tone pulse signal source, the local oscillation signal source and described
Jump frequency coding signal source input signal is provided by frequency reference, and is respectively provided with fractional frequency division unit and multiplier unit；Institute
State in step 3, the propagation time propagates to abnormity point for the two-tone signal of coding, the PIM signals that abnormity point is produced propagate to reception
The electrical length of machine；The computational methods of the electrical length are comprised the following steps：
Step A：Instrument is calibrated, standard component access instrument is tested port, the other end accesses low intermodulation load；To jumping
Frequency pulse signal source, the calibration of pure-tone pulse signal source synchronizing chip；Jump frequency coding signal source is made only to launch simple signal, frequency is
f1；Pure-tone pulse signal source launches simple signal, and frequency is f2, then 3 rank PIM signal frequencies of standard component excitation are 2f1-
f2；Fixed impulsive synchronization time delay all the way is motionless, provides the calibration range A-B of another impulsive synchronization time delay；According to synchronization delayed time
Calibration range launches two-tone signal testing standard part successively, and receiver receives PIM signals and carries out time frequency analysis, when PIM time-frequencies are long
The corresponding time delay moment thinks impulsive synchronization success when degree is most long；
Step B：Set up test plane and calibrate receiver synchronization；Testing standard part, PIM pulse of the receiver to standard component is carried out
Incoherent coherent detection, its copy coherent signal be with PIM same frequencys, initial phase be zero, Phase Continuation, pulsewidth identical jump
Frequency reference signal；It is Δ t1 at the time of now examination criteria part produces PIM signals, then it is system reference plane to make Δ t1；
Under conditions of receiver is synchronously constant, it is assumed that it is Δ t2 to measure the moment that PIM abnormity points in cable system occur, then 0.5*
(Δ t2- Δ t1), as electrical length of the abnormity point relative to test port.
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| CN104880621B (en) * | 2015-04-18 | 2018-06-05 | 南京纳特通信电子有限公司 | Self calibration passive cross modulation test instrument |
| CN107517476B (en) * | 2017-08-24 | 2021-03-23 | 东莞弗兰德通信科技有限公司 | Method, device, equipment and storage medium for positioning intermodulation fault point of antenna feed system |
| CN107612636A (en) * | 2017-08-24 | 2018-01-19 | 东莞弗兰德通信科技有限公司 | Antenna for base station intermodulation fault point positioning method, device, equipment and storage medium |
| CN111521897A (en) * | 2020-04-30 | 2020-08-11 | 华南师范大学 | Passive intermodulation interference source positioning system and positioning test method |
| 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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| CN103684490A (en) * | 2013-12-16 | 2014-03-26 | 中国电子科技集团公司第四十一研究所 | Passive intermodulation outlier quick locating method based on vector network analyzer |
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