CN103592565A - Position detection method and device for fault of cable - Google Patents
Position detection method and device for fault of cable Download PDFInfo
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Abstract
The invention discloses a position detection method and device for a fault of a cable. The method includes: transmitting swept-frequency signals, obtaining reflection coefficients at a group of frequencies through calculation; obtaining a relation between the reflection coefficients and positions of the cable or a relation between standing-wave ratios and the positions of the cable through calculation according to the reflection coefficients corresponding to the group of frequencies; comparing the reflection coefficients or the standing-wave ratios with preset threshold values and if one specific reflection coefficient or one specific standing-wave ratio is larger than a corresponding threshold value, a position of the cable, corresponding to the reflection coefficient or the standing-wave ratio is a fault point of the cable. The position detection method and device for the fault of the cable does not require adding of a hardware device or location of the fault through an instrument carried by detecting personnel and a breakpoint or a fault position of a cable between a device and an antenna feeder can be detected only through a soft procedure so that cost is reduced greatly, fault-diagnosing efficiency is improved and self-diagnosing function of the device is realized.
Description
Technical field
The present invention relates to the communications field, be specifically related to a kind of cable fault method for detecting position and device.
Background technology
Along with the development of mobile communication system, operator except the performance of concern equipment own and quality time, has turned one's attention to the serviceability of equipment.It is exactly a kind of important service function that standing-wave ratio (SWR) detects, and is an important means of inspection machine fault, for ensureing the quality of communication process signal.
In prior art, it is to be transmitted and calculated reflection coefficient and standing-wave ratio (SWR) with reflected signal by detection that standing-wave ratio (SWR) detects, and this reflection coefficient and standing-wave ratio (SWR) are corresponding a certain frequencies, have to reflection coefficient and the standing-wave ratio (SWR) of specific frequency.Whether this standing-wave ratio (SWR) detection technique can only be judged system standing-wave ratio (SWR) fault, but cannot conclude that equipment is to the particular location of cable trouble spot between antenna system.
Summary of the invention
The technical issues that need to address of the present invention are to provide a kind of cable fault method for detecting position and device, need not increase hardware unit, without testing staff, carry instrument location fault, get final product checkout equipment to breakpoint or the abort situation of cable between antenna system, greatly reduce costs, improve fault diagnosis efficiency, realize the self-diagnostic function of equipment.
In order to solve the problems of the technologies described above, the invention provides a kind of cable fault method for detecting position, comprising:
Transmitting swept-frequency signal, calculate the reflection coefficient under a class frequency, the reflection coefficient corresponding according to this class frequency calculates the relation of reflection coefficient and cable position or the relation of standing-wave ratio (SWR) and cable position of obtaining, compare reflection coefficient or standing-wave ratio (SWR) and predetermined threshold value, if a certain reflection coefficient or a certain standing-wave ratio (SWR) are greater than predetermined threshold value, cable position corresponding to this reflection coefficient or this standing-wave ratio (SWR) is cable fault point.
Further, described according to this class frequency, corresponding reflection coefficient calculating obtains the relation of reflection coefficient and cable position or the relation of standing-wave ratio (SWR) and cable position, comprising:
The reflection coefficient that this class frequency is corresponding carries out inverse Fourier transform, obtain the reflection coefficient of time domain, then according to the distance=speed * time, obtain the relation of reflection coefficient and cable position, or according to the relation of described reflecting system and cable position, calculate the relation of standing-wave ratio (SWR) and cable position.
Further, described method also comprises: according to the relation of the relation of described reflection coefficient and cable position or described standing-wave ratio (SWR) and cable position, draw reflection coefficient oscillogram or standing-wave ratio (SWR) oscillogram, if get from described reflection coefficient oscillogram or standing-wave ratio (SWR) oscillogram reflection coefficient or the standing-wave ratio (SWR) that is greater than predetermined threshold value, cable position corresponding to this reflection coefficient or this standing-wave ratio (SWR) is cable fault point.
Further, described method specifically comprises:
Transmitting swept-frequency signal, it is Δ f that frequency sweep stepping is set, and calculates reflection coefficient X (f) corresponding to a class frequency;
X (f) is carried out to inverse Fourier transform, obtain the reflection coefficient x (t) of one group of time domain;
Relation formula according to distance with the time
the reflection coefficient x (t) of the function of time is changed into the reflection coefficient x (d) of distance function, wherein, d is distance, and t is the time, and v is transmission speed, v=λ
f* c, λ
ffor relative velocity coefficient;
According to
calculate the standing-wave ratio (SWR) v (d) of distance function;
Draw reflection coefficient x (d) oscillogram or standing-wave ratio (SWR) v (d) oscillogram, from scheming, directly show that cable position corresponding to point that reflection coefficient or standing wave ratio are greater than predetermined threshold value is cable fault point.
In order to solve the problems of the technologies described above, the present invention also provides a kind of cable fault position detecting device, comprising:
Frequency sweep transmitter module, for launching swept-frequency signal;
Reflection coefficient acquisition module, for calculating the reflection coefficient under a class frequency;
Trouble spot judging module, for calculating according to reflection coefficient corresponding to this class frequency the relation of reflection coefficient and cable position or the relation of standing-wave ratio (SWR) and cable position of obtaining; And compare reflection coefficient or standing-wave ratio (SWR) and predetermined threshold value, if a certain reflection coefficient or a certain standing-wave ratio (SWR) are greater than predetermined threshold value, cable position corresponding to this reflection coefficient or this standing-wave ratio (SWR) is cable fault point.
Further, described trouble spot judging module, for calculating and obtain the relation of reflection coefficient and cable position or the relation of standing-wave ratio (SWR) and cable position according to reflection coefficient corresponding to this class frequency, comprising:
The reflection coefficient that this class frequency is corresponding carries out inverse Fourier transform, obtain the reflection coefficient of time domain, then according to the distance=speed * time, obtain the relation of reflection coefficient and cable position, or according to the relation of described reflecting system and cable position, calculate the relation of standing-wave ratio (SWR) and cable position.
Further, described trouble spot judging module, also for according to the relation of the relation of described reflection coefficient and cable position or described standing-wave ratio (SWR) and cable position, draw reflection coefficient oscillogram or standing-wave ratio (SWR) oscillogram, if get from described reflection coefficient oscillogram or standing-wave ratio (SWR) oscillogram reflection coefficient or the standing-wave ratio (SWR) that is greater than predetermined threshold value, cable position corresponding to this reflection coefficient or this standing-wave ratio (SWR) is cable fault point.
Further, described frequency sweep transmitter module, for launching swept-frequency signal, it is Δ f that frequency sweep stepping is set;
Described reflection coefficient acquisition module, for calculating the reflection coefficient X (f) under a class frequency;
Described trouble spot judging module, for X (f) is carried out to inverse Fourier transform, obtains the reflection coefficient x (t) of one group of time domain; Relation formula according to distance with the time
the reflection coefficient x (t) of the function of time is changed into the reflection coefficient x (d) of distance function, wherein, d is distance, and t is the time, and v is transmission speed, v=λ
f* c, λ
ffor relative velocity coefficient; According to
calculate the standing-wave ratio (SWR) v (d) of distance function; Draw reflection coefficient x (d) oscillogram or standing-wave ratio (SWR) v (d) oscillogram, from scheming, directly show that cable position corresponding to point that reflection coefficient or standing wave ratio are greater than predetermined threshold value is cable fault point.
Compared with prior art, cable fault method for detecting position provided by the invention and device, for reflection coefficient or standing-wave ratio (SWR) position probing, obtain reflection coefficient or the intensity of standing-wave ratio (SWR) and corresponding position between equipment and antenna feeder, and then analysis obtains breakpoint or the position of failure point of cable, the present invention need not increase hardware unit, without testing staff, carry instrument location fault, only by software flow, get final product checkout equipment to breakpoint or the abort situation of cable between antenna feeder, greatly reduce cost, improve fault diagnosis efficiency, realized the self-diagnostic function of equipment.
Accompanying drawing explanation
Fig. 1 is the structural drawing of cable abort situation pick-up unit in embodiment;
Fig. 2 is cable abort situation detection method process flow diagram in embodiment;
Fig. 3 is the structural drawing of cable abort situation pick-up unit in an application example;
Fig. 4 is the structural drawing of cable abort situation pick-up unit in an application example;
Fig. 5 is cable abort situation detection method process flow diagram in an application example;
In Fig. 6, (1) is an application example frequency domain standing-wave ratio (SWR) oscillogram;
In Fig. 6, (2) are the oscillograms of time domain standing-wave ratio (SWR) v (d) in an application example.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, hereinafter in connection with accompanying drawing, embodiments of the invention are elaborated.It should be noted that, in the situation that not conflicting, the embodiment in the application and the feature in embodiment be combination in any mutually.
Embodiment:
As shown in Figure 1, the present embodiment provides a kind of cable fault position detecting device, comprising:
Frequency sweep transmitter module, for launching swept-frequency signal;
Wherein, described frequency sweep transmitter module also comprises:
Baseband module, for frequency sweep transmitting baseband signal;
Transmitter module, for being radiofrequency signal by described baseband signal modulating-coding.
Reflection coefficient acquisition module, for calculating the reflection coefficient under a class frequency;
Trouble spot judging module, for calculating according to reflection coefficient corresponding to this class frequency the relation of reflection coefficient and cable position or the relation of standing-wave ratio (SWR) and cable position of obtaining; And compare reflection coefficient or standing-wave ratio (SWR) and predetermined threshold value, if a certain reflection coefficient or a certain standing-wave ratio (SWR) are greater than predetermined threshold value, cable position corresponding to this reflection coefficient or this standing-wave ratio (SWR) is cable fault point.
Wherein, as a kind of preferred mode, described trouble spot judging module is carried out inverse Fourier transform by reflection coefficient corresponding to this class frequency, obtain the reflection coefficient of time domain, then according to the distance=speed * time, obtain the relation of reflection coefficient and cable position, or according to the relation of described reflecting system and cable position, calculate the relation of standing-wave ratio (SWR) and cable position.
In addition, described trouble spot judging module, also for according to the relation of the relation of described reflection coefficient and cable position or described standing-wave ratio (SWR) and cable position, draw reflection coefficient oscillogram or standing-wave ratio (SWR) oscillogram, if get from described reflection coefficient oscillogram or standing-wave ratio (SWR) oscillogram reflection coefficient or the standing-wave ratio (SWR) that is greater than predetermined threshold value, cable position corresponding to this reflection coefficient or this standing-wave ratio (SWR) is cable fault point.
In an application example, described frequency sweep transmitter module, for launching swept-frequency signal, it is Δ f that frequency sweep stepping is set;
Described reflection coefficient acquisition module, for calculating the reflection coefficient X (f) under a class frequency;
Described trouble spot judging module, for X (f) is carried out to inverse Fourier transform, obtains the reflection coefficient x (t) of one group of time domain; According to
the reflection coefficient x (t) of the function of time is changed into the reflection coefficient x (d) of distance function, wherein, d is distance, and t is the time, and v is transmission speed, v=λ
f* c, λ
ffor relative velocity coefficient; According to
calculate the standing-wave ratio (SWR) v (d) of distance function; Draw reflection coefficient x (d) oscillogram or standing-wave ratio (SWR) v (d) oscillogram, from scheming, directly show that cable position corresponding to point that reflection coefficient or standing wave ratio are greater than predetermined threshold value is cable fault point.
As shown in Figure 2, adopt said apparatus, the present embodiment provides a kind of cable fault method for detecting position, comprises the following steps:
S101: transmitting swept-frequency signal, calculates the reflection coefficient under a class frequency;
S102: the reflection coefficient corresponding according to this class frequency calculates the relation of reflection coefficient and cable position or the relation of standing-wave ratio (SWR) and cable position of obtaining;
S103: compare reflection coefficient or standing-wave ratio (SWR) and predetermined threshold value, if a certain reflection coefficient or a certain standing-wave ratio (SWR) are greater than predetermined threshold value, cable position corresponding to this reflection coefficient or this standing-wave ratio (SWR) is cable fault point.
In step S102, reflection coefficient corresponding to this class frequency can be carried out to inverse Fourier transform, obtain the reflection coefficient of time domain, then according to the distance=speed * time, obtain the relation of reflection coefficient and cable position, or according to the relation of described reflecting system and cable position, calculate the relation of standing-wave ratio (SWR) and cable position.
In addition, in step S103, can also be according to the relation of the relation of described reflection coefficient and cable position or described standing-wave ratio (SWR) and cable position, draw reflection coefficient oscillogram or standing-wave ratio (SWR) oscillogram, if get from described reflection coefficient oscillogram or standing-wave ratio (SWR) oscillogram reflection coefficient or the standing-wave ratio (SWR) that is greater than predetermined threshold value, cable position corresponding to this reflection coefficient or this standing-wave ratio (SWR) is cable fault point.
In an application example, described method specifically comprises the following steps:
S201: transmitting swept-frequency signal, it is Δ f that frequency sweep stepping is set, and calculates reflection coefficient X (f) corresponding to a class frequency;
S202: X (f) is carried out to inverse Fourier transform, obtain the reflection coefficient x (t) of one group of time domain;
S203: during detection, reflected signal reflects through cable breakpoint or trouble spot, the distance of signal transmission is 2d, therefore, distance with the relation formula of time is:
according to this formula, the reflection coefficient x (t) of the function of time is changed into the reflection coefficient x (d) of distance function, wherein, d is distance, and t is the time, and v is transmission speed, v=λ
f* c, λ
ffor relative velocity coefficient;
S204: according to the relational expression of reflection coefficient and standing-wave ratio (SWR):
calculate the standing-wave ratio (SWR) v (d) of distance function;
S205: draw reflection coefficient x (d) oscillogram or standing-wave ratio (SWR) v (d) oscillogram, directly show that from scheming cable position corresponding to point that reflection coefficient or standing wave ratio are greater than predetermined threshold value is cable fault point.
The 2.1G UMTS standard of take is example, if there is breakpoint or fault in equipment to the cable between antenna feeder, the standing-wave ratio (SWR) detected value of this point is larger, under communication apparatus normal operating condition, can directly use UMTS signal to carry out standing-wave ratio (SWR) detection, for localization of faults position, can do frequency sweep to radiofrequency signal processes, calculate the reflection coefficient of one group of frequency domain, then the reflection coefficient of frequency domain is done to inverse Fourier transform, obtain the reflection coefficient of time domain, further analyze the point and the corresponding position thereof that obtain standing-wave ratio (SWR) higher value.
A kind of cable fault position detecting device is provided in an application example, has comprised: baseband module, transmitter module, reflection coefficient acquisition module, control module and trouble spot judging module, wherein:
Baseband module, for frequency sweep transmitting baseband signal;
Wherein, the baseband signal of sending out can be the signals such as single-tone, UMTS, GSM, use in the present embodiment tone signal to process, certainly, the present invention is equally applicable to other frequency ranges and other standards.
Transmitter module, for being radiofrequency signal by described baseband signal modulating-coding, comprises digital to analog converter, frequency mixer, power amplifier and wave filter etc.;
Reflection coefficient acquisition module, for calculating the reflection coefficient under a class frequency according to transmitting with reflected signal, comprises frequency mixer, wave filter, analog to digital converter etc.;
This module comprises two kinds of situations:
The first situation, as shown in Figure 3, in reflection coefficient acquisition module, transmit and reflected signal through power amplifier or filter coupled after share a passage, need a switching over, change-over switch in figure, by adopting several module controls, gathers and transmits or reflected signal according to demand.The relative hardware unit of this situation is less, saves hardware cost, and software is processed complicated a little, and gathering transmits will process at twice with reflected signal.
The second situation, as shown in Figure 4, in reflection coefficient acquisition module, transmit and reflected signal through power amplifier or filter coupled after independent processing respectively, this situation hardware unit is added into a sense channel, hardware link relative complex, high expensive, software is processed relatively simple, when collection transmits with reflected signal, can gather simultaneously, then calculate reflection coefficient.
Control module, realization flow is controlled;
Trouble spot judging module, for calculating according to reflection coefficient corresponding to this class frequency the cable relation of reflection coefficient and position or the relation of standing-wave ratio (SWR) and cable position of obtaining; And compare reflection coefficient or standing-wave ratio (SWR) and predetermined threshold value, if a certain reflection coefficient or a certain standing-wave ratio (SWR) are greater than predetermined threshold value, cable position corresponding to this reflection coefficient or this standing-wave ratio (SWR) is cable fault point.
Adopt said apparatus, as shown in Figure 5, in an application example, provide a kind of cable fault method for detecting position, comprise the following steps:
S301: switching working mode, the normal operation standard of this communication system is UMTS standard, need to switch to standing-wave ratio (SWR) detecting pattern;
S302: transmitting baseband tone signal, launching initial frequency is f
1, termination frequency is f
2, establish f
sfor f
2-f
1, frequency sweep stepping Δ f is set, frequency sweep times N
swith f
s, the relation between Δ f is to be f
s=Δ f*N
s;
S303: gather the data that transmit with reflected signal, calculate reflection coefficient;
According to the hardware configuration of reflection coefficient acquisition module, there are two kinds of situations:
The first situation, adopts hardware configuration as shown in Figure 4, adopts number and will process at twice, adopts number at every turn and need to take baseband signal as reference.First gather baseband signal x
fwith the y that transmits
f, the reference data v of the relative baseband signal that obtains after treatment transmitting
f=y
f/ x
f, the feedback signal that this reference data is baseband signal and the ratio of baseband signal; Then, gather baseband signal x
rwith reflected signal y
r, obtain equally one group of reference data v
r=y
r/ x
r; Reflected signal and feedback signal is in the same time not comparable, and the two uses respectively baseband signal for referencial use, obtains Amplitude Ratio and the phase differential of feedback or the relative baseband signal of reflected signal, then uses this two groups of reference data v
f, v
rreflection coefficient X (f)=v is obtained in calculating
r/ v
f.
The second situation, adopts hardware configuration as shown in Figure 5, adopts when several, directly gathers the y that transmits
fwith reflected signal y
r, then calculate reflection coefficient X (f)=y
r/ y
f.
The present embodiment adopts the first situation, and software computing flow process is complicated, just computing speed is had to certain influence, can reduce hardware cost like this.
By previous action, obtain f
1corresponding reflection coefficient, according to frequency sweep stepping Δ f, setting gradually transmitting frequency is f
1+ n * Δ f (n=0,1 ..., N
s-1), obtain f
1the reflection coefficient that+n * Δ f is corresponding, (swept frequency range is f finally to obtain a class frequency
1to f
2, stepping Δ f) and corresponding reflection coefficient X (f), according to the relational expression of standing-wave ratio (SWR) and reflecting system
calculate one group of frequency domain standing-wave ratio (SWR) oscillogram, see Fig. 6 (1);
S304: X (f) is carried out to inverse Fourier transform, obtain the reflection coefficient x (t) of one group of time domain;
S305: the reflection coefficient x (d) that the reflection coefficient x (t) of the function of time is changed into distance function;
In step S302, mentioned f
s=Δ f*N
s,
2.1G UMTS emission band broadband is f
2-f
1, i.e. f
s=f
2-f
1.For the reflection coefficient x (t) of time domain, the time between 2
t=n * Δ t (n=0,1 ..., N
s-1).The following describes relation, measurement range and the resolution of reflection coefficient and distance in the embodiment of the present invention.
1., the relation of reflection coefficient and distance:
Distance with the relational expression of time is: d=v * t, and n=0,1 ..., N
s-1, but when reality detects, reflected signal reflects through cable breakpoint or trouble spot, the distance of signal transmission is 2d, actual range formula should be:
For most of media, as in coaxial cable, the transmission speed of signal is slower than the light velocity, has a relative velocity coefficient lambda
f, the actual transmission speed of signal is v=λ
f* c, therefore, distance with the pass of time is:
Will
the reflection coefficient x (t) of the substitution function of time, can obtain the reflection coefficient x (d) of distance function.
2., measurement range d
max, the equipment that can measure and the maximum distance between antenna feeder:
Wherein, Δ f is frequency sweep stepping, λ
fbe medium relative velocity coefficient, c is the light velocity.
3., resolution ax D, the minor increment between two trouble spots can distinguishing, resolution is relevant with frequency sweep, frequency sweep is wider, resolution is less
ΔD＝v×Δt/2＝λ
f×c×Δt/2
Wherein, because reflected signal is double distance, need to get 1/2 processing, time resolution
λ
ffor medium relative velocity coefficient, c is the light velocity.
S306: according to
obtain the standing-wave ratio (SWR) v (d) of distance function;
S307: the oscillogram of drawing standing-wave ratio (SWR) v (d), as shown in Fig. 6 (2), obtain value and the position thereof of standing-wave ratio (SWR) a little, when standing wave ratio is greater than predetermined threshold value, this puts corresponding position can be judged as trouble spot, from as above finding out, shows that standing wave ratio is greater than predetermined threshold value 1.2 near 3.3 meters and 7.5 meters, can think that at 3.3 meters and 7.5 meters of be cable fault point, have cable fault to occur.
From above-described embodiment, can find out, with respect to prior art, the cable fault method for detecting position and the device that in above-described embodiment, provide, for reflection coefficient or standing-wave ratio (SWR) position probing, obtain reflection coefficient or the intensity of standing-wave ratio (SWR) and corresponding position between equipment and antenna system, and then analysis obtains breakpoint or the position of failure point of cable, the present invention need not increase hardware unit, without testing staff, carry instrument location fault, only by software flow, get final product checkout equipment to breakpoint or the abort situation of cable between antenna system, greatly reduce cost, improved fault diagnosis efficiency, realized the self-diagnostic function of equipment.
One of ordinary skill in the art will appreciate that all or part of step in said method can come instruction related hardware to complete by program, described program can be stored in computer-readable recording medium, as ROM (read-only memory), disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuit.Correspondingly, each the module/unit in above-described embodiment can adopt the form of hardware to realize, and also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
The foregoing is only the preferred embodiments of the present invention, be not intended to limit protection scope of the present invention.According to summary of the invention of the present invention; also can there be other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion; within the spirit and principles in the present invention all; any modification of doing, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in.
Claims (8)
1. a cable fault method for detecting position, comprising:
Transmitting swept-frequency signal, calculate the reflection coefficient under a class frequency, the reflection coefficient corresponding according to this class frequency calculates the relation of reflection coefficient and cable position or the relation of standing-wave ratio (SWR) and cable position of obtaining, compare reflection coefficient or standing-wave ratio (SWR) and predetermined threshold value, if a certain reflection coefficient or a certain standing-wave ratio (SWR) are greater than predetermined threshold value, cable position corresponding to this reflection coefficient or this standing-wave ratio (SWR) is cable fault point.
2. the method for claim 1, is characterized in that:
Described according to this class frequency, corresponding reflection coefficient calculating obtains the relation of reflection coefficient and cable position or the relation of standing-wave ratio (SWR) and cable position, comprising:
The reflection coefficient that this class frequency is corresponding carries out inverse Fourier transform, obtain the reflection coefficient of time domain, then according to the distance=speed * time, obtain the relation of reflection coefficient and cable position, or according to the relation of described reflecting system and cable position, calculate the relation of standing-wave ratio (SWR) and cable position.
3. method as claimed in claim 2, is characterized in that:
Described method also comprises: according to the relation of the relation of described reflection coefficient and cable position or described standing-wave ratio (SWR) and cable position, draw reflection coefficient oscillogram or standing-wave ratio (SWR) oscillogram, if get from described reflection coefficient oscillogram or standing-wave ratio (SWR) oscillogram reflection coefficient or the standing-wave ratio (SWR) that is greater than predetermined threshold value, cable position corresponding to this reflection coefficient or this standing-wave ratio (SWR) is cable fault point.
4. method as claimed in claim 3, is characterized in that:
Described method specifically comprises:
Transmitting swept-frequency signal, it is Δ f that frequency sweep stepping is set, and calculates reflection coefficient X (f) corresponding to a class frequency;
X (f) is carried out to inverse Fourier transform, obtain the reflection coefficient x (t) of one group of time domain;
Relation formula according to distance with the time
the reflection coefficient x (t) of the function of time is changed into the reflection coefficient x (d) of distance function, wherein, d is distance, and t is the time, and v is transmission speed, v=λ
f* c, λ
ffor relative velocity coefficient;
According to
calculate the standing-wave ratio (SWR) v (d) of distance function;
Draw reflection coefficient x (d) oscillogram or standing-wave ratio (SWR) v (d) oscillogram, from scheming, directly show that cable position corresponding to point that reflection coefficient or standing wave ratio are greater than predetermined threshold value is cable fault point.
5. a cable fault position detecting device, comprising:
Frequency sweep transmitter module, for launching swept-frequency signal;
Reflection coefficient acquisition module, for calculating the reflection coefficient under a class frequency;
Trouble spot judging module, for calculating according to reflection coefficient corresponding to this class frequency the relation of reflection coefficient and cable position or the relation of standing-wave ratio (SWR) and cable position of obtaining; And compare reflection coefficient or standing-wave ratio (SWR) and predetermined threshold value, if a certain reflection coefficient or a certain standing-wave ratio (SWR) are greater than predetermined threshold value, cable position corresponding to this reflection coefficient or this standing-wave ratio (SWR) is cable fault point.
6. device as claimed in claim 5, is characterized in that:
Described trouble spot judging module, for calculating and obtain the relation of reflection coefficient and cable position or the relation of standing-wave ratio (SWR) and cable position according to reflection coefficient corresponding to this class frequency, comprising:
The reflection coefficient that this class frequency is corresponding carries out inverse Fourier transform, obtain the reflection coefficient of time domain, then according to the distance=speed * time, obtain the relation of reflection coefficient and cable position, or according to the relation of described reflecting system and cable position, calculate the relation of standing-wave ratio (SWR) and cable position.
7. device as claimed in claim 5, is characterized in that:
Described trouble spot judging module, also for according to the relation of the relation of described reflection coefficient and cable position or described standing-wave ratio (SWR) and cable position, draw reflection coefficient oscillogram or standing-wave ratio (SWR) oscillogram, if get from described reflection coefficient oscillogram or standing-wave ratio (SWR) oscillogram reflection coefficient or the standing-wave ratio (SWR) that is greater than predetermined threshold value, cable position corresponding to this reflection coefficient or this standing-wave ratio (SWR) is cable fault point.
8. device as claimed in claim 5, is characterized in that:
Described frequency sweep transmitter module, for launching swept-frequency signal, it is Δ f that frequency sweep stepping is set;
Described reflection coefficient acquisition module, for calculating the reflection coefficient X (f) under a class frequency;
Described trouble spot judging module, for X (f) is carried out to inverse Fourier transform, obtains the reflection coefficient x (t) of one group of time domain; Relation formula according to distance with the time
the reflection coefficient x (t) of the function of time is changed into the reflection coefficient x (d) of distance function, wherein, d is distance, and t is the time, and v is transmission speed, v=λ
f* c, λ
ffor relative velocity coefficient; According to
calculate the standing-wave ratio (SWR) v (d) of distance function; Draw reflection coefficient x (d) oscillogram or standing-wave ratio (SWR) v (d) oscillogram, from scheming, directly show that cable position corresponding to point that reflection coefficient or standing wave ratio are greater than predetermined threshold value is cable fault point.
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