CN113468753B - Design method and system of segmented coupling type radiation leakage cable - Google Patents
Design method and system of segmented coupling type radiation leakage cable Download PDFInfo
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Abstract
The invention discloses a design method and a system of a segmented coupling radiation type leakage cable. The method comprises the following steps: (1) acquiring the use requirement of the radiation type leaky cable; (2) designing alternative cable subsections and obtaining the electrical performance of the alternative cable subsections; (3) iteratively solving a minimum cable sub-section set required by satisfying the use requirement of the radiation type leaky cable by using each cable sub-section; (4) and the lengths of the cable subsections are arranged in a descending order along the signal transmission direction according to the coupling loss values, so that the design scheme of the segmented coupling radiation type leaky cable is obtained. The invention provides an effective design method of the sectional coupling radiation type leakage cable, which can perform sectional combination optimization according to specific cable performance requirements in a programmed and automatic manner, replaces notch structure design with sectional combination optimization, greatly reduces cable development cost, shortens development period and lowers development threshold.
Description
Technical Field
The invention belongs to the field of wireless communication, and particularly relates to a design method and a system of a segmented coupling radiation type leakage cable.
Background
Leaky cables are coaxial cables that allow the outer conductor to leak. However, the transmission loss of a single core wire or a twisted pair wire is too large for high frequency, and the waveguide has a large size and is expensive, so that the widely used leaky feeder is a coaxial cable in which a thin copper sheet is used as an outer conductor and slots of different forms are cut in the outer conductor. Leaky cables can be divided into two categories: coupled and radiating. The electromagnetic energy leaked by the coupling type leakage cable is non-directional and is rapidly reduced along with the increase of the distance, the radiation type leakage has directivity, the same leakage energy can be relatively concentrated in the radiation direction and is not rapidly reduced along with the increase of the distance, and the coupling loss is relatively small in a specific frequency and a specific direction.
The transmission attenuation and coupling loss of the leaky cable determine the total loss of the leaky cable, and optimizing the total loss of the leaky cable is always the direction of the design effort of the leaky cable. The transmission attenuation is an important index for describing the loss degree of electromagnetic energy transmitted inside the cable, and for a leaky cable, besides the loss caused by conductors and media, the slot structure also directly influences the transmission loss. The coupling loss is a comprehensive index for describing the radiation quantity, namely the acceptable quantity, of the leaky cable, and is directly determined by factors such as the size, the shape, the frame type, the spacing and the like of the slot. However, the smaller the coupling loss, the more leakage and the greater the transmission loss. However, such a design has a certain degree of redundancy, which results in the cable being too fast in overall attenuation and limited in coverage.
The outer conductor of the traditional leaky cable is generally provided with one or a class of slotted holes periodically and repeatedly, so that the transmission attenuation constant along the line is consistent with the coupling loss performance, but the total transmission attenuation is increased along with the increase of the coverage distance, so that the system loss of the leaky cable is increased, the system loss of the leaky cable is large, and the requirement of high-speed rail 5G coverage cannot be met. Aiming at the problem, a leaky cable product with sectional coupling and slotting (or performance gradual change) appears in the industry, namely, the attenuation constant and the coupling loss performance of transmission along the line are not constant any more, but the attenuation constant is smaller and the coupling loss is larger closer to the signal source side, and the attenuation constant is larger and the coupling loss is smaller farther away from the signal source side, so that the actual field intensity distribution along the leaky cable is more uniform compared with the conventional leaky cable, and the system loss of the whole line can be greatly reduced.
However, since the slots on the outer conductor have various designs and different performances, the design of the segmented coupling type radiation cable requires that the slots with different performances are selected according to the design requirements, different lengths are arranged, the design difficulty is high, and the time cost is high.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a design method and a system of a segmented coupling type radiation leakage cable, and aims to obtain an effective design method to reduce the design difficulty of the segmented coupling type radiation leakage cable, perform the design of the segmented coupling type radiation leakage cable in a programmed or even automatic mode and shorten the development period of the segmented coupling type radiation leakage cable by performing programmed optimization on a limited number of cable subsections with different slot holes and known performances, thereby solving the technical problems of high design difficulty and high development time cost of the existing segmented coupling type radiation leakage cable.
To achieve the above object, according to an aspect of the present invention, there is provided a method of designing a segmented coupling type radiation leakage cable, including the steps of:
(1) acquiring the use requirement of the radiation type leaky cable;
(2) designing each optional cable subsection of the segmented coupling cable, and acquiring the attenuation performance and the coupling loss performance of each cable subsection;
(3) iteratively solving a minimum cable sub-section set required by satisfying the use requirement of the radiation type leaky cable obtained in the step (1) by using the alternative cable sub-sections obtained in the step (2), and if the alternative cable sub-sections obtained in the step (2) cannot satisfy the use requirement of the radiation type leaky cable obtained in the step (1), repeating the step (2) to design alternative cable sub-sections with better attenuation performance and coupling loss performance;
the iterative solution specifically comprises: from alternative cable sub-sections KiSelecting a cable sub-section set from N, and calculating a value a satisfying the performance requirement obtained in step (1)Under the constraint condition, the total length maximum value of each alternative cable subsection is adopted when the cable subsections are collected, and the total length maximum value of each alternative subsection is just larger than or equal to the preset distance L0Set of cable sub-sections Ki1, 2,. n } as a minimum set of cable sub-segments;
(4) and (4) calculating the lengths of all the cable subsegments in the minimum cable subsegment set obtained in the step (3), and setting the cable subsegments with corresponding lengths in a descending order along the signal transmission direction according to the coupling loss value to obtain a design scheme of the segmented coupling radiation type leaky cable.
Preferably, the method for designing the segmented coupling radiation type leaky cable comprises the step (1) of using the cable when the signal transmission distance is less than the preset distance L0The comprehensive loss of each point in the range is lower than the performance requirement value A.
Preferably, the method for designing a segmented coupling radiation type leaky cable includes the following specific steps (2):
designing N types of slotting according to the manufacturing process of the radiation type leaky cable, and respectively testing to obtain the cable subsection K of the ith slotting typeiAttenuation per unit length alphaiAnd coupling loss Lci1, 2, N, satisfying:
if a is less than b, there is Lca＞LcbWherein a, b is 1, 2.
Preferably, the method for designing the segmented coupling radiation type leaky cable includes the following steps (3): iteration is carried out according to the descending order of the coupling loss: judging whether the current cable subsection set can meet the design requirement obtained in the step (1); when the current cable subsection set is judged to meet the design requirement, the length of each cable subsection in the cable subsection set is obtained as the minimum cable subsection set, otherwise: if the remaining alternative cable subsections exist, adding the cable subsection with the largest coupling loss into the cable subsection set so as to update the current cable subsection set and perform iteration, otherwise, namely, the remaining alternative cable subsections do not exist, adopting the alternative cable subsections obtained in the step (2) to fail to meet the use requirement of the radiation type leaky cable obtained in the step (1), and repeating the step (2) to design the alternative cable subsections with better attenuation performance and coupling loss performance;
judging whether the cable subset can meet the design requirement obtained in the step (1) or not, specifically as follows:
acquiring the maximum value L of the total length of the cable subsections of the current cable subsection set under the constraint condition of meeting the performance requirement value ATWhen the total length of the cable sub-section is at its maximum LTTransmission distance L exceeding design requirement0And if so, judging that the current cable subsection set can meet the design requirement, otherwise, judging that the current cable subsection set cannot meet the design requirement.
Preferably, the step (3) of the method for designing a segmented coupling radiation type leaky cable is specifically as follows:
(3-1) for alternative subsections K arranged in descending order of coupling lossi1, 2.. N, the first N sets of cable sub-sections of the slot type with the largest coupling loss { K) are selectediI 1, 2,. n } as the current set of cable sub-segments and go to step (3-2);
(3-2) calculating the length L of the Cable sub-sectioniAnd entering the step (3-3) as follows:
wherein L isi、αi、LciCable sub-section K of the ith slot typeiLength, attenuation per unit length, coupling loss, where i ═ 1, 2,. n;
(3-3) calculating the maximum value L of the total length of the cable subsectionT＝∑LiN, · i ═ 1, 2; if L isT≥L0Then the cable sub-segments are grouped together { Ki1, 2,. n, and LiEntering step (4) as a minimum cable subsection set and lengths of each cable subsection in the set; otherwise: and if N is less than N, assigning N +1 to N, and jumping to the step (3-1), otherwise, entering the step (2).
Preferably, in the method for designing a segmented coupling radiation-type leaky cable, the length of each cable sub-segment in the set is calculated in step (4), specifically as follows:
for a set of cable sub-sections { Ki1, 2,. n }, and if a < b, Lc is presenta＞Lcb1, 2, n, each cable sub-section length LiComprises the following steps:
preferably, in the method for designing a segmented coupling radiation-type leaky cable, in step (4), the segmented coupling radiation-type leaky cable is designed by arranging: k1(L1)K2(L2)...Kn(Ln) Wherein, K isi(Li) Is expressed as length LiOf the ith slot typei。
According to another aspect of the present invention, there is provided a system for designing a radiation-type leaky cable of a sectional coupling type, including: the system comprises a design requirement acquisition module, a cable subsection performance acquisition module, an iteration optimization module and a scheme integration module;
the design requirement acquisition module is used for acquiring the use requirement of the radiation type leaky cable and submitting the use requirement to the iteration optimization module;
the cable subsection performance acquisition module is used for acquiring alternative cable subsections and the attenuation performance and the coupling loss performance of each cable subsection and submitting the attenuation performance and the coupling loss performance to the iteration optimization module;
the iterative optimization module is used for iteratively solving the minimum cable sub-section set required by meeting the use requirement of the radiation type leaky cable by adopting the alternative cable sub-sections, and submitting the minimum cable sub-section set to the scheme integration module; if the alternative cable subsections cannot meet the use requirements of the radiation type leaky cable, calling the alternative cable subsections with better attenuation performance and coupling loss performance designed by the cable subsection performance acquisition module;
the performance judgment submodule is used for judging whether the cable subsection set can meet the design requirement or not, and is specifically used for:
acquiring the maximum value L of the total length of the cable subsegments of the current cable subsegment set under the constraint condition of a performance requirement value A meeting the design requirementTWhen the total length of the cable sub-section is at its maximum LTTransmission distance L exceeding design requirement0If so, judging that the current cable subsection set can meet the design requirement, otherwise, judging that the current cable subsection set cannot meet the design requirement;
and the scheme integration module is used for calculating the lengths of all the cable subsections in the minimum cable subsection set, and setting the cable subsections with corresponding lengths in a descending order along the signal transmission direction according to the coupling loss value to obtain a design scheme of the sectional coupling type radiation leakage cable.
According to another aspect of the present invention, there is provided an electronic device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the method for designing a segmented coupling radiation-type leaky cable according to the present invention.
According to another aspect of the present invention, there is provided a non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements the steps of the method for designing a segmented-coupled radiation-type leaky cable provided by the present invention.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
the invention provides an effective design method of a sectional coupling radiation type leakage cable, which can perform sectional combination optimization in a programmed and automatic way according to specific cable performance requirements. The attenuation performance and the coupling loss performance of the cable subsections can be stored as prior knowledge and repeatedly applied to the development of the radiation leaky cable with different design requirements, so that the comprehensive loss of the radiation leaky cable can be optimized through subsection coupling, a new slot structure does not need to be designed, and complex performance tests are carried out, so that the notch structure design is replaced by subsection combination optimization, the cable development cost is greatly reduced, the development period is shortened, and the development threshold is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a radiating segmented coupling cable;
fig. 2 is a schematic diagram of the effect of the combined loss optimization of the radiation-type segmented coupling cable.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a design method of a segmented coupling radiation type leakage cable, which comprises the following steps:
(1) obtaining the use requirement of the radiation type leaky cable, wherein the use requirement is that the signal transmission distance is less than a preset distance L0The comprehensive loss of each point in the range is lower than a performance requirement value A; the use requirement is specifically determined according to the relevant standard, the requirement of a user and the like;
(2) designing each optional cable subsection of the segmented coupling cable, and acquiring the attenuation performance and the coupling loss performance of each cable subsection, preferably arranging the attenuation performance and the coupling loss performance in a descending order; the method specifically comprises the following steps:
designing N types of slotting according to the manufacturing process of the radiation type leaky cable, and respectively testing to obtain the cable subsection K of the ith slotting typeiAttenuation per unit length alphaiAnd coupling loss Lci，i＝1，2，.., N, satisfying:
if a is less than b, there is Lca＞LcbWherein a, b is 1, 2.., N;
(3) iteratively solving a minimum cable sub-section set required by satisfying the use requirement of the radiation type leaky cable obtained in the step (1) by using the alternative cable sub-sections obtained in the step (2), and if the alternative cable sub-sections obtained in the step (2) cannot satisfy the use requirement of the radiation type leaky cable obtained in the step (1), repeating the step (2) to design alternative cable sub-sections with better attenuation performance and coupling loss performance;
the iterative solution specifically comprises: from alternative cable sub-sections KiSelecting a cable sub-section set from the N, and calculating the maximum total length of each alternative cable sub-section in the cable sub-section set under the constraint condition that the performance requirement value a obtained in the step (1) is met, wherein the maximum total length of each alternative cable sub-section is just greater than or equal to the preset distance L0Set of cable sub-sections Ki1, 2,. n } as a minimum set of cable sub-segments;
in the preferred scheme, iteration is performed according to the descending order of coupling loss: judging whether the current cable subsection set can meet the design requirement obtained in the step (1); when the current cable subsection set is judged to meet the design requirement, the length of each cable subsection in the cable subsection set is obtained as the minimum cable subsection set, otherwise: if the remaining alternative cable subsections exist, adding the cable subsection with the largest coupling loss into the cable subsection set so as to update the current cable subsection set and perform iteration, otherwise, namely, the remaining alternative cable subsections do not exist, adopting the alternative cable subsections obtained in the step (2) to fail to meet the use requirement of the radiation type leaky cable obtained in the step (1), and repeating the step (2) to design the alternative cable subsections with better attenuation performance and coupling loss performance;
judging whether the design requirement obtained in the step (1) can be met or not, and specifically, the following steps are carried out:
obtaining the total of the cable subsections of the current cable subsection set under the constraint condition of meeting the performance requirement value AMaximum value of length LTWhen the total length of the cable sub-section is at its maximum LTTransmission distance L exceeding design requirement0And if so, judging that the current cable subsection set can meet the design requirement, otherwise, judging that the current cable subsection set cannot meet the design requirement.
The specific scheme is as follows:
(3-1) for alternative subsections K arranged in descending order of coupling lossi1, 2.. N, the first N sets of cable sub-sections of the slot type with the largest coupling loss { K) are selectediI 1, 2,. n } as the current set of cable sub-segments and go to step (3-2);
(3-2) calculating the length L of the Cable sub-sectioniAnd entering the step (3-3) as follows:
wherein L isi、αi、LciCable sub-section K of the ith slot typeiLength, attenuation per unit length, coupling loss, where i ═ 1, 2,. n;
(3-3) calculating the maximum value L of the total length of the cable subsectionT＝∑LiN, · i ═ 1, 2; if L isT≥L0Then the cable sub-segments are grouped together { Ki1, 2,. n, and LiEntering step (4) as a minimum cable subsection set and lengths of each cable subsection in the set; otherwise: and if N is less than N, assigning N +1 to N, and jumping to the step (3-1), otherwise, entering the step (2).
(4) For the minimum cable subsection set obtained in the step (3), calculating the lengths of all the cable subsections in the set, and setting the cable subsections with corresponding lengths along the signal transmission direction according to the descending order of the coupling loss values to obtain a design scheme of the segmented coupling radiation type leaky cable;
the length of each cable sub-section in the set is calculated as follows:
for a set of cable sub-sections { Ki1, 2,. n }, and if a < b, Lc is presenta＞Lcb1, 2, n, each cable sub-section length LiComprises the following steps:
the design scheme of the sectional coupling radiation type leakage cable is that the sectional coupling radiation type leakage cable is arranged along the signal propagation direction: k1(L1)K2(L2)...Kn(Ln) Wherein, K isi(Li) Is expressed as length LiOf the ith slot typeiAs shown in fig. 1.
The following are examples:
noting the attenuation per unit length α of each cable sub-sectioniCoupling loss LciThe total loss at the end of each segment is LliLength L of each segmentiFor the whole continuous leaky cable, the coupling loss Lc of each section is from the signal input end as the initial endiWith a decreasing trend. Because the total amount of energy transmitted in the leaky cable is constant, the unit length attenuation alpha with small coupling lossiAnd will be relatively large. A certain signal transmission distance L is set for a certain frequency point in the signal transmission system0The required value A of the total loss performance and the attenuation L of each sectioniαiAnd coupling loss LciComprises the following steps:
Ll1＝L1α1+Lc1＜A
Ll2＝L1α1+L2α2+Lc2＜A
…
Lln＝∑Lnαn+Lcn＜A
i＝1，2，...n
because of the coupling loss Lc per segmentiGet smaller and smallerTherefore, there will always be a total attenuation of LiαiCan continue until all segments length LiThe sum of which meets the requirements. Theoretically, the total energy transmitted by the leaky cable is certain, so the total length L of the leaky cableT＝∑LiThere must be an upper limit for i 1, 2.
For example, leaky cables required by a railway and subway broadband 700-3700 Mhz frequency band communication system need to meet the requirement that standing wave peak values caused by periodic slotting avoid frequency bands of signal transmission in frequency bands, then according to corresponding standards (such as QZZ/T-3007 and QZZ/T-3012), angles, lengths and widths of slots are designed to enable comprehensive loss of each frequency point to meet the requirement value, and for signal transmission distance L0The comprehensive loss of each point is lower than the performance required value A, and the cable subsections are designed according to the following scheme:
(1) obtaining the design requirement of the radiation type leaky cable: i.e. obtaining the distance L between the signal transmission0The comprehensive loss is lower than the performance requirement value A;
(2) designing each optional cable sub-section of the segmented coupling cable, acquiring the attenuation performance and the coupling loss performance of each cable sub-section, and arranging the attenuation performance and the coupling loss performance according to the descending order of the coupling loss: the method specifically comprises the following steps:
designing N types of slotting according to the manufacturing process of the radiation type leaky cable, and respectively testing to obtain the cable subsection K of the ith slotting typeiAttenuation per unit length alphaiAnd coupling loss Lci，i＝1，2，...，N，
In general, for each segment itself, the cable production process and the outer conductor slots should be designed to attenuate by α per unit lengthiAnd coupling loss LciThe sectional mixed leakage cable has the advantages that the total length of the sectional mixed leakage cable can meet the requirements of users as good as possible, the number of sections can be reduced, and the production and the processing of the leakage cable are facilitated.
The sequence numbers are such that the cable sub-sections satisfy:
if a is less than b, there is Lca＞LcbWherein a, b is 1, 2.., N;
when the outer conductor slot is designed, the situation that the electrical performance of different slots is completely the same is almost impossible to occur, if the same or equivalent slot with the same coupling loss occurs, only the slot type with the minimum attenuation per unit length is selected as an alternative cable subsection, and therefore, the situation that the coupling loss of different alternative cable subsections is the same does not exist.
(3) Iteratively solving a minimum cable sub-section set required by satisfying the use requirement of the radiation type leaky cable obtained in the step (1) by using the alternative cable sub-sections obtained in the step (2), and if the alternative cable sub-sections obtained in the step (2) cannot satisfy the use requirement of the radiation type leaky cable obtained in the step (1), repeating the step (2) to design alternative cable sub-sections with better attenuation performance and coupling loss performance; the method specifically comprises the following steps:
initializing n-1;
(3-1) for alternative subsections K arranged in descending order of coupling lossi1, 2.. N, the first N sets of cable sub-sections of the slot type with the largest coupling loss { K) are selectediI 1, 2,. n } as the current set of cable sub-segments and go to step (3-2);
(3-2) calculating the length L of the Cable sub-sectioniAnd entering the step (3-3) as follows:
wherein L isi、αi、LciCable sub-section K of the ith slot typeiLength, attenuation per unit length, coupling loss, where i ═ 1, 2,. n;
(3-3) calculating the maximum value L of the total length of the cable subsectionT＝∑LiN, · i ═ 1, 2; if L isT≥L0Then the cable sub-sections are assembled { Ki1, 2,. n } and LiEntering step (4) as a minimum cable subsection set and lengths of each cable subsection in the set; otherwise: if n <And N, assigning N +1 to N, and jumping to the step (3-1), otherwise, entering the step (2).
(4) For the minimum cable subsection set obtained in the step (3), calculating the lengths of all the cable subsections in the set, and setting the cable subsections with corresponding lengths along the signal transmission direction according to the descending order of the coupling loss values to obtain a design scheme of the segmented coupling radiation type leaky cable;
the length of each cable sub-section in the set is calculated as follows:
for a set of cable sub-sections { Ki1, 2,. n }, and if a < b, Lc is presenta＞Lcb1, 2, n, each cable sub-section length LiComprises the following steps:
the design scheme of the sectional coupling radiation type leakage cable is that the sectional coupling radiation type leakage cable is arranged along the signal propagation direction: k1(L1)K2(L2)...Kn(Ln) Wherein, K isi(Li) Is expressed as length LiOf the ith slot typeiAs shown in fig. 1.
The leaky cable of each section is designed by the scheme, and a certain section can be used as a base point, so that the leaky cable has better attenuation and coupling loss by optimizing the production process and the slotted hole design, and meets other electrical performances required by a use place, as shown in fig. 2.
Then, by changing the length, the width and the inclination angle of the slotted hole on the outer conductor, the signal radiation capacity of the slotted hole is changed, the coupling loss is increased or reduced, and the unit attenuation is correspondingly reduced or increased due to the fact that the total energy transmitted by the cable is constant. Through the mode, the leakage cables of all the sections are combined to meet the use requirement.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A method for designing a segmented coupling radiation type leaky cable is characterized by comprising the following steps:
(1) acquiring the use requirement of the radiation type leaky cable; the use requirement is that the signal transmission distance is less than the preset distance L0The comprehensive loss of each point in the range is lower than a performance requirement value A;
(2) designing each optional cable subsection of the segmented coupling cable, and acquiring the attenuation performance and the coupling loss performance of each cable subsection;
(3) iteratively solving a minimum cable sub-section set required by satisfying the use requirement of the radiation type leaky cable obtained in the step (1) by using the alternative cable sub-sections obtained in the step (2), and if the alternative cable sub-sections obtained in the step (2) cannot satisfy the use requirement of the radiation type leaky cable obtained in the step (1), repeating the step (2) to design alternative cable sub-sections with better attenuation performance and coupling loss performance;
the iterative solution specifically comprises: from alternative cable sub-sections KiSelecting a cable sub-section set from the N, and calculating the maximum total length of each alternative cable sub-section in the cable sub-section set under the constraint condition that the performance requirement value a obtained in the step (1) is met, wherein the maximum total length of each alternative cable sub-section is just greater than or equal to the preset distance L0Set of cable sub-sections Ki1, 2,. n } as a minimum set of cable sub-segments;
(4) and (4) calculating the lengths of all the cable subsegments in the minimum cable subsegment set obtained in the step (3), and setting the cable subsegments with corresponding lengths in a descending order along the signal transmission direction according to the coupling loss value to obtain a design scheme of the segmented coupling radiation type leaky cable.
2. The method for designing a segmented coupling radiation type leaky cable as claimed in claim 1, wherein the step (2) is embodied as:
making of leaky cable according to radiationDesigning N slotting types, and respectively testing to obtain the cable subsection K of the ith slotting typeiAttenuation per unit length alphaiAnd coupling loss Lci1, 2, N, satisfying:
if a is less than b, there is Lca＞LcbWherein a, b is 1, 2.
3. The method of claim 2, wherein the step (3) is: iteration is carried out according to the descending order of the coupling loss: judging whether the current cable subsection set can meet the design requirement obtained in the step (1); when the current cable subsection set is judged to meet the design requirement, the length of each cable subsection in the cable subsection set is obtained as the minimum cable subsection set, otherwise: if the remaining alternative cable subsections exist, adding the cable subsection with the largest coupling loss into the cable subsection set so as to update the current cable subsection set and perform iteration, otherwise, namely, the remaining alternative cable subsections do not exist, adopting the alternative cable subsections obtained in the step (2) to fail to meet the use requirement of the radiation type leaky cable obtained in the step (1), and repeating the step (2) to design the alternative cable subsections with better attenuation performance and coupling loss performance;
judging whether the cable subset can meet the design requirement obtained in the step (1) or not, specifically as follows:
acquiring the maximum value L of the total length of the cable subsections of the current cable subsection set under the constraint condition of meeting the performance requirement value ATWhen the total length of the cable sub-section is at its maximum LTTransmission distance L exceeding design requirement0And if so, judging that the current cable subsection set can meet the design requirement, otherwise, judging that the current cable subsection set cannot meet the design requirement.
4. The method for designing a segmented coupling radiation type leaky cable as claimed in claim 3, wherein the step (3) is embodied as follows:
(3-1) for the coupling loss according toAlternative subsegments K arranged in descending orderi1, 2.. times.n, the first N sets of cable sub-sections of the slot type with the largest coupling loss values are selected { K ═ K ·iI 1, 2,. n } as the current set of cable sub-segments and go to step (3-2);
(3-2) calculating the length L of the Cable sub-sectioniAnd entering the step (3-3) as follows:
wherein L isi、αi、LciCable sub-section K of the ith slot typeiLength, attenuation per unit length, coupling loss, where i ═ 1, 2,. n;
(3-3) calculating the maximum value L of the total length of the cable subsectionT＝∑LiN, · i ═ 1, 2; if L isT≥L0Then the cable sub-segments are grouped together { Ki1, 2,. n, and LiEntering step (4) as a minimum cable subsection set and lengths of each cable subsection in the set; otherwise: and if N is less than N, assigning N +1 to N, and jumping to the step (3-1), otherwise, entering the step (2).
5. The method of claim 1, wherein the step (4) of calculating the lengths of the cable sub-sections in the set comprises:
for a set of cable sub-sections { Ki1, 2,. n }, and if a < b, Lc is presenta＞Lcb1, 2, n, each cable sub-section length LiComprises the following steps:
6. the method according to claim 1, wherein the step (4) of designing the segmented coupling radiation type leaky cable comprises the following steps: k1(L1)K2(L2)...Kn(Ln) Wherein, K isi(Li) Is expressed as length LiOf the ith slot typei。
7. A system for designing a segmented coupled radiating leaky cable, comprising: the system comprises a design requirement acquisition module, a cable subsection performance acquisition module, an iteration optimization module and a scheme integration module;
the design requirement acquisition module is used for acquiring the use requirement of the radiation type leaky cable and submitting the use requirement to the iteration optimization module; the use requirement is that the signal transmission distance is less than the preset distance L0The comprehensive loss of each point in the range is lower than a performance requirement value A;
the cable subsection performance acquisition module is used for acquiring alternative cable subsections and the attenuation performance and the coupling loss performance of each cable subsection and submitting the attenuation performance and the coupling loss performance to the iteration optimization module;
the iterative optimization module is used for iteratively solving the minimum cable sub-section set required by meeting the use requirement of the radiation type leaky cable by adopting the alternative cable sub-sections, and submitting the minimum cable sub-section set to the scheme integration module; if the alternative cable subsections cannot meet the use requirements of the radiation type leaky cable, calling the alternative cable subsections with better attenuation performance and coupling loss performance designed by the cable subsection performance acquisition module;
the performance judgment submodule is used for judging whether the cable subsection set can meet the design requirement or not, and is specifically used for:
acquiring the cable section of the current cable section set under the constraint condition of a performance requirement value A meeting the design requirementMaximum value of total length of segment LTWhen the total length of the cable sub-section is at its maximum LTTransmission distance L exceeding design requirement0If so, judging that the current cable subsection set can meet the design requirement, otherwise, judging that the current cable subsection set cannot meet the design requirement;
and the scheme integration module is used for calculating the lengths of all the cable subsections in the minimum cable subsection set, and setting the cable subsections with corresponding lengths in a descending order along the signal transmission direction according to the coupling loss value to obtain a design scheme of the sectional coupling type radiation leakage cable.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the method of designing a segmented coupled, radiation-leaking cable of any of claims 1-6 are implemented when the program is executed by the processor.
9. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the steps of the method of designing a sectionally-coupled, radiation-type leaky cable as claimed in any one of claims 1 to 6.
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