CN117676661A - Indoor test system of marine TDMA multi-hop transmission wireless network - Google Patents
Indoor test system of marine TDMA multi-hop transmission wireless network Download PDFInfo
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Abstract
The invention relates to an indoor test system of a marine TDMA multi-hop transmission wireless network, which comprises: an offshore communication network comprising randomly distributed N network nodes, the N network nodes comprising: source node: a node A; destination node: node B; the i-th hop node: c (C) i Wherein i is equal to or greater than 1 and equal to or less than N-2, and node A, node B and node C i Are nodes that are not identical within the network; the node A is sequentially connected with a fixed attenuator A, a circulator A, a power divider A and a combiner A through radio frequency cables, the power divider A is respectively connected with an adjustable attenuator A-1 and a matched load A-1, and the combiner A is respectively connected with an adjustable attenuator C 1 -1 is connected to a matching load a-2; the node B is sequentially connected with a fixed attenuator B, a circulator B, a power divider B and a combiner B through radio frequency cables, the power divider B is respectively connected with an adjustable attenuator B-1 and a matched load B-2, and the combiner B is respectively connected with an adjustable attenuator C i ‑1The system is connected with a matched load B-1, and can quickly build a scene simulating the offshore beyond-line-of-sight wireless communication indoors to verify the jump transmission performance of the offshore communication system.
Description
Technical Field
The invention relates to the technical field of offshore wireless communication, in particular to an indoor test system of an offshore TDMA multi-hop transmission wireless network.
Background
The offshore wireless communication system has undergone a first generation analog voice communication, a second generation ship automatic identification system (Automatic Identification System, abbreviated as AIS) and a third generation very high frequency data exchange system (VHF Date Exchange System, abbreviated as VDES), and is currently evolving into a fourth generation all-digital broadband communication system. The fourth generation of all-digital broadband communication system expands the bandwidth while continuing to use the TDMA wireless ad hoc network mode, improves the communication rate, introduces a multi-hop transmission mechanism, and can effectively solve the problem of offshore remote cross-line-of-sight transmission.
When long-distance transmission is carried out at sea, the network internal source node and the destination node are not visible under the influence of the earth curvature, and cannot directly communicate. The source node needs to select the node closest to the destination node in the line-of-sight range to carry out data skip transmission, and when the destination node cannot be reached by one skip transmission, the source node also needs to carry out multiple skip transmissions. When the offshore test is carried out, the source node and the destination node are far away and have no visible passage, and wireless transmission cannot be directly carried out, but when the indoor test is carried out, the source node, the skip transmission node and the destination node are all in the same space, and the source node does not carry out wireless communication with the destination node through the skip transmission node any more, but directly carries out wireless communication with the destination node. How to test the offshore TDMA multi-hop transmission wireless network indoors becomes a difficult problem. The traditional mode of adopting a channel simulator for multi-hop transmission test, but for the multi-hop transmission test of a TDMA mechanism for receiving and transmitting the same frequency, the system is complex, the test cost is high, the test effect is difficult to evaluate accurately and the like when a test system is built by using the channel simulator.
Disclosure of Invention
In order to solve the problems that how to test the marine TDMA multi-hop transmission wireless network indoors becomes difficult, and the traditional mode of adopting a channel simulator for multi-hop transmission test and the multi-hop transmission test of a TDMA mechanism for receiving and transmitting the same frequency, the system is complicated, the test cost is high, the test effect is difficult to evaluate accurately and the like by using the channel simulator to build a test system, the invention provides the technical scheme that:
an indoor test system for an offshore TDMA multi-hop transmission wireless network, comprising: an offshore communication network comprising a random distribution of N network nodes,
the N network nodes include: source node: a node A; destination node: node B; the i-th hop node: c (C) i Wherein i is equal to or greater than 1 and equal to or less than N-2, and node A, node B and node C i Are nodes that are not identical within the network;
the node A is sequentially connected with a fixed attenuator A, a circulator A, a power divider A and a combiner A through radio frequency cables, the power divider A is respectively connected with an adjustable attenuator A-1 and a matched load A-1, and the combiner A is respectively connected with an adjustable attenuator C 1 -1 is connected to a matching load a-2;
node C 1 Sequentially connected with a fixed attenuator C through a radio frequency cable 1 Circulator C 1 Power divider C 1 And combiner C 1 Connected with a power divider C 1 Respectively with adjustable attenuators C 1 -1 and an adjustable attenuator C 1 -2 phase connection, combiner C 1 Respectively with an adjustable attenuator A-1 and an adjustable attenuator C 2 -1 is connected;
node C 2 Sequentially connected with a fixed attenuator C through a radio frequency cable 2 Circulator C 2 Power divider C 2 And combiner C 2 Connected with a power divider C 2 Respectively adjustable attenuator C 2 -1 and an adjustable attenuator C 2 -2 phase connection, combiner C 2 Respectively with adjustable attenuators C 1 -2 and an adjustable attenuator C 3 -2 is connected;
node C 3 Sequentially connected with a fixed attenuator C through a radio frequency cable 3 Circulator C 3 Power divider C 3 And combiner C 3 Connected with a power divider C 3 Respectively with adjustable attenuators C 3 -1 and an adjustable attenuator C 3 -2Connected with combiner C 3 Respectively with adjustable attenuators C 2 -2 and an adjustable attenuator C i -2 is connected;
the other jump nodes are analogized in turn;
node C i Sequentially connected with a fixed attenuator C through a radio frequency cable i Circulator C i Power divider C i And combiner C i Connected with a power divider C i Respectively with adjustable attenuators C i -1 and an adjustable attenuator C i -2 phase connection, combiner C i Respectively with an adjustable attenuator B-1 and an adjustable attenuator C 2 -1 is connected;
the node B is sequentially connected with a fixed attenuator B, a circulator B, a power divider B and a combiner B through radio frequency cables, the power divider B is respectively connected with an adjustable attenuator B-1 and a matched load B-2, and the combiner B is respectively connected with an adjustable attenuator C i -1 is connected to the matching load B-1.
Further: the network node A and the network node C 1 Between, network node C 1 And network node C 2 Between, network node C 2 And network node C 3 Between, … … network node C i And a visible path exists between the network node B.
Further: the network node A and the network node C 1 Attenuation of the space betweenThe calculation formula is as follows:
wherein R is A-C1 For network node a and network node C 1 The space distance lambda is the working wavelength of the network, and the network node C 1 And network node C 2 Between, network node C 2 And network node C 3 Between, … … network node C i Spatial attenuation L between a node B and a network C1-C2 、L C2-C3 、The calculation mode is the same.
Further: fixed attenuator A, fixed attenuator C 1 Fixed attenuator C 2 Fixed attenuator C 3 … … fixed attenuator C i The attenuation values of the fixed attenuators B are respectively L Fixed attenuator A 、 ……L Fixed attenuator B Expressed, L Fixed attenuator A 、/>……L Fixed attenuator B The fixed attenuation value is not less than 30dB, and when the transmission power of all nodes of the network is the same, the fixed attenuation value is selected.
Further: power divider A and power divider C 1 Power divider C 2 … … have attenuation values of L respectively Power divider A 、
Combiner A and combiner C 1 Combiner C 2 … … have attenuation values of L respectively Combiner A 、
Adjustable attenuator A-1 and adjustable attenuator C 1 -1, an adjustable attenuator C 1 -2, an adjustable attenuator C 2 -1, an adjustable attenuator C 2 -2, an adjustable attenuator C 3 -1, an adjustable attenuator C 3 -2 … … Adjustable attenuator C i -1, an adjustable attenuator C i The attenuation values of the-2 and the adjustable attenuator B-1 are respectively L Adjustable attenuator A-1 、 L Adjustable attenuator B-1 The calculation formulas of the attenuation values of the adjustable attenuator A-1 are shown as follows:
adjustable attenuator C 1 -1 attenuation values are:
when network node A and network node C 1 With a fixed space between them, the adjustable attenuator A-1 and the adjustable attenuator C 1 The attenuation value of-1 should be the same, then
The attenuation values of the other adjustable attenuators are calculated in the same way.
Further: when N network nodes move, if the network topology structure is not changed, the scene of the offshore wireless networking communication can be dynamically simulated by only dynamically adjusting the value of the adjustable attenuator;
if the network topology structure is changed, the network nodes are connected according to the changed topology structure, and the value of the adjustable attenuator is dynamically adjusted, so that the scene of the offshore wireless networking communication can be dynamically simulated.
According to the indoor test system of the marine TDMA multi-hop transmission wireless network, which is provided by the invention, the test network can be adjusted at will according to the requirements of different hop times, the access of one or more hop nodes is realized, the attenuation of a space channel can be simulated by using an attenuator, a scene simulating the marine beyond-the-horizon wireless communication is built indoors quickly, and the hop performance of the marine communication system is verified.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of a distribution of N communication nodes at sea;
FIG. 2 is a diagram of the composition of an indoor test system for an offshore TDMA multi-hop transmission communication network;
FIG. 3 is a schematic diagram of an offshore wireless hopping information transfer path;
FIG. 4 is a diagram of indoor test system connections for an offshore TDMA multi-hop transport wireless network;
FIG. 5 is a connection diagram of an indoor test system with a network topology change.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features in the embodiments may be combined with each other, and the present invention will be described in detail below with reference to the drawings and the embodiments.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be clear that the dimensions of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention: the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.
An indoor test system for an offshore TDMA multi-hop transmission wireless network, comprising: an offshore communication network comprising a random distribution of N network nodes,
FIG. 1 is a schematic diagram of a distribution of N communication nodes at sea;
the N network nodes comprise source nodes: a node A; destination node: node B; the i-th hop node: c (C) i Wherein i is equal to or greater than 1 and equal to or less than N-2, and node A, node B and node C i Are nodes that are not identical within the network;
n nodes are randomly distributed, networking is carried out among network nodes in an ad hoc mode, the network nodes can dynamically update a network topology structure, and a source node and a destination node of information transmission have no visible path.
When the source node sends information to the destination node, the source node firstly selects the node in the visible range, and the node closest to the destination node is selected as the 1 st hop transmission node. According to the rule, the 2 nd hop transmission node, … … and the i th hop transmission node are sequentially selected, and the i th hop transmission node can directly communicate with the destination node in the line of sight.
In the network, it is assumed that node A is a source node, node B is a destination node, and node C i Is the ith jump transmission node, wherein i is more than or equal to 1 and less than or equal to N-2, and node A, node B and node C i Are non-identical nodes within the network. The transmission path of the information transmission from the source node to the destination node is:
FIG. 2 is a diagram of the composition of an indoor test system for an offshore TDMA multi-hop transmission communication network;
FIG. 3 is a schematic diagram of an offshore wireless hopping information transfer path;
FIG. 4 is a diagram of indoor test system connections for an offshore TDMA multi-hop transport wireless network;
and (3) building a test system indoors, and accessing other nodes in the network as required in the test process. The connection relationship is as follows:
the node A is sequentially connected with a fixed attenuator A, a circulator A, a power divider A and a combiner A through radio frequency cables, the power divider A is respectively connected with an adjustable attenuator A-1 and a matched load A-1, and the combiner A is respectively connected with an adjustable attenuator C 1 -1 is connected to a matching load a-2;
node C 1 Sequentially connected with a fixed attenuator C through a radio frequency cable 1 Circulator C 1 Power divider C 1 And combiner C 1 Connected with a power divider C 1 Respectively with adjustable attenuators C 1 -1 and an adjustable attenuator C 1 -2 phase connection, combiner C 1 Respectively with an adjustable attenuator A-1 and an adjustable attenuator C 2 -1 is connected;
node C 2 Sequentially connected with a fixed attenuator C through a radio frequency cable 2 Circulator C 2 Power divider C 2 And combiner C 2 Connected with a power divider C 2 Respectively with adjustable attenuators C 2 -1 and an adjustable attenuator C 2 -2 phase connection, combiner C 2 Respectively with adjustable attenuators C 1 -2 and an adjustable attenuator C 3 -2 is connected;
node C 3 Sequentially connected with a fixed attenuator C through a radio frequency cable 3 Circulator C 3 Power divider C 3 And combiner C 3 Connected with a power divider C 3 Respectively with adjustable attenuators C 3 -1 and an adjustable attenuator C 3 -2 phase connection, combiner C 3 Respectively with adjustable attenuators C 2 -2 and an adjustable attenuator C i -2 is connected;
the other jump nodes are analogized in turn;
node C i Sequentially connected with a fixed attenuator C through a radio frequency cable i Circulator C i Power divider C i And combiner C i Connected with a power divider C i Respectively with adjustable attenuators C i -1 and an adjustable attenuator C i -2 phase connection, combiner C i Respectively with an adjustable attenuator B-1 and an adjustable attenuator C 2 -1 is connected;
the node B is sequentially connected with a fixed attenuator B, a circulator B, a power divider B and a combiner B through radio frequency cables, the power divider B is respectively connected with an adjustable attenuator B-1 and a matched load B-2, and the combiner B is respectively connected with an adjustable attenuator C i -1 is connected to the matching load B-1.
Wherein: the network node is a same-frequency TDMA ad hoc network communication node, the radio frequency transceiver shares 1 port, and the transceiver is used in a cross mode according to a time division system;
the fixed attenuator is a large-signal fixed attenuator, and can attenuate high-power radio frequency signals in a fixed power proportion;
the adjustable attenuator is a small-signal adjustable attenuator and can accurately attenuate a small-power radio frequency signal;
the circulator is a high-isolation three-port circulator, and can convert a single receiving-transmitting port into a split receiving-transmitting dual-port;
the power divider is a two-port power divider, and can equally power-distribute signals;
the combiner is a two-port combiner, and can perform power synthesis on two paths of signals;
the matching load is a single-port matching load, and can perform matching absorption on the radio frequency signals;
the radio frequency cable is a high shielding cable, and the equipment and the components can be connected.
Further: the network node A and the network node C 1 Between, network node C 1 And network node C 2 Between, network node C 2 And network node C 3 Between, … … network node C i And a visible path exists between the network node B.
Further: the network node A and the network node C 1 Attenuation of the space between L A-C1 The calculation formula is as follows:
wherein,for network node a and network node C 1 And the space distance lambda is the working wavelength of the network. Network node C 1 And network node C 2 Between, network node C 2 And network node C 3 Between, … … network node C i Spatial attenuation between the node B and the network node B>The calculation mode is the same.
Further: fixed attenuator A, fixed attenuator C 1 Fixed attenuator C 2 Fixed attenuator C 3 … … fixed attenuator C i The attenuation values of the fixed attenuators B are respectively L Fixed attenuator A 、 The representation is made of a combination of a first and a second color,
L fixed attenuator A 、The fixed attenuation value is not less than 30dB, and when the transmission power of all nodes of the network is the same, the fixed attenuation value is selected.
Further: power divider A and power divider C 1 Power divider C 2 … … have attenuation values of L respectively Power divider A 、
Combiner A and combiner C 1 Combiner C 2 … … have attenuation values of L respectively Combiner A 、 Adjustable attenuator A-1 and adjustable attenuator C 1 -1, an adjustable attenuator C 1 -2, an adjustable attenuator C 2 -1, an adjustable attenuator C 2 -2, an adjustable attenuator C 3 -1, an adjustable attenuator C 3 -2 … … Adjustable attenuator C i -1, an adjustable attenuator C i The attenuation values of the-2 and the adjustable attenuator B-1 are respectively L Adjustable attenuator A-1 、/> L Adjustable attenuator B-1 The calculation formulas of the attenuation values of the adjustable attenuator A-1 are shown as follows：
Adjustable attenuator C 1 -1 attenuation values are:
when network node A and network node C 1 With a fixed space between them, the adjustable attenuator A-1 and the adjustable attenuator C 1 The attenuation value of-1 should be the same, then
The attenuation values of the other adjustable attenuators are calculated in the same way.
Further: when N network nodes move, if the network topology structure is not changed, the scene of the offshore wireless networking communication can be dynamically simulated by only dynamically adjusting the value of the adjustable attenuator;
if the network topology structure is changed, the network nodes are connected according to the changed topology structure, and the value of the adjustable attenuator is dynamically adjusted, so that the scene of the offshore wireless networking communication can be dynamically simulated.
FIG. 5 is a connection diagram of an indoor test system for network topology changes, assuming that node B moves into the visible range of node A, the visible relationship of other nodes in the network is unchanged, and the network topology is changed. The indoor test system connects the power divider A with the combiner B through the adjustable attenuator A-2, and connects the power divider B with the combiner A through the adjustable attenuator B-2.
The transmission path of the information transmission from the source node to the destination node is:and->All the nodes exist, the source node A directly communicates with the destination node B according to the transmission rule, and information transmission is not carried out through the skip node. The system can further verify whether the network protocol is adaptively and correctly changed when the network topology is changed.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (6)
1. An indoor test system of an offshore TDMA multi-hop transmission wireless network, characterized in that: comprising the following steps: an offshore communication network comprising a random distribution of N network nodes,
the N network nodes include: source node: a node A; destination node: node B; the i-th hop node: c (C) i Wherein i is equal to or greater than 1 and equal to or less than N-2, and node A, node B and node C i Are nodes that are not identical within the network;
the node A is sequentially connected with a fixed attenuator A, a circulator A, a power divider A and a combiner A through radio frequency cables, the power divider A is respectively connected with an adjustable attenuator A-1 and a matched load A-1, and the combiner A is respectively connected with an adjustable attenuator C 1 -1 is connected to a matching load a-2;
node C 1 Sequentially connected with a fixed attenuator C through a radio frequency cable 1 Circulator C 1 Power divider C 1 And combiner C 1 Connected with a power divider C 1 Respectively with adjustable attenuators C 1 -1 and an adjustable attenuator C 1 -2 phase connection, combiner C 1 Respectively with an adjustable attenuator A-1 and an adjustable attenuator C 2 -1 is connected;
node C 2 By radio frequency electricityThe cable is connected with the fixed attenuator C in turn 2 Circulator C 2 Power divider C 2 And combiner C 2 Connected with a power divider C 2 Respectively with adjustable attenuators C 2 -1 and an adjustable attenuator C 2 -2 phase connection, combiner C 2 Respectively with adjustable attenuators C 1 -2 and an adjustable attenuator C 3 -2 is connected;
node C 3 Sequentially connected with a fixed attenuator C through a radio frequency cable 3 Circulator C 3 Power divider C 3 And combiner C 3 Connected with a power divider C 3 Respectively with adjustable attenuators C 3 -1 and an adjustable attenuator C 3 -2 phase connection, combiner C 3 Respectively with adjustable attenuators C 2 -2 and an adjustable attenuator C i -2 is connected;
the other jump nodes are analogized in turn;
node C i Sequentially connected with a fixed attenuator C through a radio frequency cable i Circulator C i Power divider C i And combiner C i Connected with a power divider C i Respectively with adjustable attenuators C i -1 and an adjustable attenuator C i -2 phase connection, combiner C i Respectively with an adjustable attenuator B-1 and an adjustable attenuator C 2 -1 is connected;
the node B is sequentially connected with a fixed attenuator B, a circulator B, a power divider B and a combiner B through radio frequency cables, the power divider B is respectively connected with an adjustable attenuator B-1 and a matched load B-2, and the combiner B is respectively connected with an adjustable attenuator C i -1 is connected to the matching load B-1.
2. An in-house test system for an offshore TDMA multi-hop transmission wireless network according to claim 1, wherein: the network node A and the network node C 1 Between, network node C 1 And network node C 2 Between, network node C 2 And network node C 3 Between, … … network node C i And a visible path exists between the network node B.
3. According to claim 1The indoor test system of the marine TDMA multi-hop transmission wireless network is characterized in that: the network node A and the network node C 1 Attenuation of the space betweenThe calculation formula is as follows:
wherein,for network node a and network node C 1 The spatial distance between them, lambda is the operating wavelength of the network,
network node C 1 And network node C 2 Between, network node C 2 And network node C 3 Between, … … network node C i Spatial attenuation between a node B and a networkThe calculation mode is the same.
4. An in-house test system for an offshore TDMA multi-hop transmission wireless network according to claim 1, wherein: the fixed attenuator A and the fixed attenuator C 1 Fixed attenuator C 2 Fixed attenuator C 3 … … fixed attenuator C i The attenuation values of the fixed attenuators B are respectively L Fixed attenuator A 、 ……L Fixed attenuator B The representation is made of a combination of a first and a second color,……L fixed attenuator B The fixed attenuation value is not less than 30dB, and when the transmission power of all nodes of the network is the same, the fixed attenuation value is selected.
5. An in-house test system for an offshore TDMA multi-hop transmission wireless network according to claim 1, wherein: the power divider A and the power divider C 1 Power divider C 2 … … have attenuation values of L respectively Power divider A 、……，
The combiner A and the combiner C 1 Combiner C 2 … … have attenuation values of L respectively Combiner A 、 ……，
Adjustable attenuator A-1 and adjustable attenuator C 1 -1, an adjustable attenuator C 1 -2, an adjustable attenuator C 2 -1, an adjustable attenuator C 2 -2, an adjustable attenuator C 3 -1, an adjustable attenuator C 3 -2 … … Adjustable attenuator C i -1, an adjustable attenuator C i The attenuation values of the-2 and the adjustable attenuator B-1 are respectively L Adjustable attenuator A-1 、 ……/> L Adjustable attenuator B-1 The calculation formulas of the attenuation values of the adjustable attenuator A-1 are shown as follows:
adjustable attenuator C 1 -1 attenuation values are:
when network node A and network node C 1 With a fixed space between them, the adjustable attenuator A-1 and the adjustable attenuator C 1 The attenuation value of-1 should be the same, then
The attenuation values of the other adjustable attenuators are calculated in the same way.
6. An in-house test system for an offshore TDMA multi-hop transmission wireless network according to claim 1, wherein: when N network nodes move, if the network topology structure is not changed, the scene of the offshore wireless networking communication can be dynamically simulated by only dynamically adjusting the value of the adjustable attenuator;
if the network topology structure is changed, the network nodes are connected according to the changed topology structure, and the value of the adjustable attenuator is dynamically adjusted, so that the scene of the offshore wireless networking communication can be dynamically simulated.
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