CN111770001A - AFDX (avionics full Duplex switched Ethernet) bus transmission characteristic detection system and method - Google Patents

AFDX (avionics full Duplex switched Ethernet) bus transmission characteristic detection system and method Download PDF

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CN111770001A
CN111770001A CN202010529194.XA CN202010529194A CN111770001A CN 111770001 A CN111770001 A CN 111770001A CN 202010529194 A CN202010529194 A CN 202010529194A CN 111770001 A CN111770001 A CN 111770001A
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bus
afdx
wire
input quantity
unit
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Inventor
赵长啸
谭楚懿
陈瑶
郜宇杰
苗原荣
张致远
栗乾瀚
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Civil Aviation University of China
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Civil Aviation University of China
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0823—Errors, e.g. transmission errors
    • H04L43/0847—Transmission error
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2605—Measuring capacitance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2611—Measuring inductance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks

Abstract

The invention provides a detection system for AFDX bus transmission characteristics, which relates to the technical field of aviation communication and comprises the following components: the system comprises a parameter real-time monitoring unit, an RGLC model building unit, a bus parameter configuration unit and a comparison output unit; the parameter real-time monitoring unit is used for acquiring real-time parameters transmitted by the AFDX bus; the method comprises the steps of obtaining bus configuration parameters for obtaining bus associated parameters, wherein the bus associated parameters comprise resistance characteristic relation, capacitance characteristic relation and conductance characteristic relation of AFDX bus transmission; the RGLC model building unit is used for acquiring the transmission characteristics of the twisted pair; the comparison output unit is used for comparing the real-time parameters transmitted by the AFDX bus, the resistance characteristic relationship, the capacitance characteristic relationship, the conductance characteristic relationship and the twisted-pair transmission characteristic transmitted by the AFDX bus so as to obtain the detection result of the AFDX bus. The system and the method provided by the invention can improve the reliability of the aviation communication bus and improve the airborne safety.

Description

AFDX (avionics full Duplex switched Ethernet) bus transmission characteristic detection system and method
Technical Field
The invention relates to the technical field of aviation communication, in particular to a system and a method for detecting transmission characteristics of an AFDX (avionics full Duplex switched Ethernet) bus.
Background
With the improvement of the requirements of people on the aviation comfort, safety and reliability, the avionics system develops towards the direction of intellectualization, miniaturization, integration, standardization and modularization. Avionics systems are typically comprised of subsystems such as flight control systems, global positioning systems, and flight management systems. The development of the avionics system goes through four stages, namely a separated electronic system, a centralized electronic system, a combined electronic system and a comprehensive shared electronic system, and the development of the avionics system is synchronous with the development process of an airplane.
A complex avionic system needs to realize coordination work among all avionic systems, needs to master and process data information of instantaneous change at any time, furthest utilizes the functions of all avionic devices and subsystems, achieves resource sharing, enables the whole avionic integrated system to work efficiently and reliably, needs to utilize a high-speed reliable airborne bus, can say that data communication and information exchange among all avionic systems on an airplane are communication networks based on the airborne bus, and the working state of the airborne bus network directly influences normal communication of all subsystems in the avionic system, thereby ensuring the reliability and safety of airplane flight.
In the prior art, the problem that the AFDX bus system cannot represent data transmission characteristics in real time is solved, the reliability of the aviation communication bus is greatly limited, and the airborne safety is reduced.
Disclosure of Invention
In view of this, the present invention provides a system and a method for detecting AFDX bus transmission characteristics, so as to alleviate the problem that the AFDX bus system cannot perform characterization of data transmission characteristics in real time in the prior art, improve the reliability of an aviation communication bus, and improve the airborne safety.
The invention provides a detection system for AFDX bus transmission characteristics, which comprises:
the system comprises a parameter real-time monitoring unit, an RGLC model building unit, a bus parameter configuration unit and a comparison output unit;
the parameter real-time monitoring unit is used for acquiring real-time parameters transmitted by the AFDX bus;
the acquired bus configuration parameters are used for acquiring bus associated parameters, and the bus associated parameters comprise resistance characteristic relation, capacitance characteristic relation and conductance characteristic relation of AFDX bus transmission;
the RGLC model building unit is used for acquiring the transmission characteristics of the twisted pair;
the comparison output unit is used for comparing the real-time parameters transmitted by the AFDX bus, the resistance characteristic relationship, the capacitance characteristic relationship and the conductance characteristic relationship transmitted by the AFDX bus and the transmission characteristics of the twisted pair so as to obtain the detection result of the AFDX bus.
In a second aspect, the present invention provides a method for detecting transmission characteristics of an AFDX bus, comprising the following steps:
the bus parameter configuration unit is used for acquiring bus associated parameters to acquire a first input quantity, the RGLC model building unit is used for acquiring twisted pair transmission characteristics to acquire a second input quantity, and the parameter real-time monitoring unit is used for acquiring real-time parameters of AFDX bus transmission to acquire a third input quantity;
and acquiring the first input quantity, the second input quantity and the third input quantity by using the comparison output unit, and comparing the first input quantity, the second input quantity and the third input quantity to acquire a detection result of AFDX bus transmission.
Preferably, the first input quantity is expressed as:
F10＝{R、G、L、C}；
wherein the content of the first and second substances,
Figure BDA0002534604990000031
G＝CtanD＝2πfCtanD，
Figure BDA0002534604990000032
in the formula, R is resistance information on a bus unit length;
l is inductance information on the unit length of the bus;
Lrinformation of the internal inductance;
Lois external inductive information;
c is capacitance information of the bus in unit length;
g is conductance information of the bus in unit length;
d is the central distance between the two conductors;
d is the conductor diameter;
σ is the conductivity of the conductor;
f is the signal transmission frequency of the conductor;
mu is the magnetic permeability of the conductor;
μris LrMagnetic permeability of (2);
mu o is LoMagnetic permeability of (2);
ris LrThe vacuum dielectric constant of (a);
ois LoThe vacuum dielectric constant of (a);
Dis the equivalent loss angle of the insulating medium.
Preferably, the second input quantity is:
Figure BDA0002534604990000041
in the formula
R1A direct current resistance per unit length of one wire;
R2a direct current resistance per unit length of the second wire;
R0a direct current resistance per unit length of the shielding layer;
L11is mutual inductance between the first wire and the shielding layer;
L22mutual inductance between the second wire and the shielding layer;
L12the mutual inductance between the first wire and the second wire;
C11the capacitance between the first conducting wire and the shielding layer;
C22the capacitance between the second wire and the shielding layer;
C12the capacitance between the first wire and the second wire;
G11is the conductance between the first wire and the shield;
G22is the conductance between the second wire and the shielding layer;
G12is the electrical conductance between the first wire and the second wire.
Preferably, the step of comparing the first input quantity, the second input quantity and the third input quantity to obtain the detection result of the AFDX bus transmission includes:
the real-time error rate of the AFDX bus system is obtained by adopting the following formula:
Figure BDA0002534604990000051
wherein BER is bit error rate;
q is a function 1- Φ (x);
phi (x) is a normal distribution function;
b is the equivalent bandwidth of the receiving filter;
s is the average power of the signal;
n is noise power;
p is the signal-to-noise ratio.
The embodiment of the invention has the following beneficial effects: the invention provides a detection system for transmission characteristics of an AFDX bus, which comprises: the system comprises a parameter real-time monitoring unit, an RGLC model building unit, a bus parameter configuration unit and a comparison output unit; the parameter real-time monitoring unit is used for acquiring real-time parameters transmitted by the AFDX bus; the method comprises the steps of obtaining bus configuration parameters for obtaining bus associated parameters, wherein the bus associated parameters comprise resistance characteristic relation, capacitance characteristic relation and conductance characteristic relation of AFDX bus transmission; the RGLC model building unit is used for acquiring the transmission characteristics of the twisted pair; the comparison output unit is used for comparing the real-time parameters transmitted by the AFDX bus, the resistance characteristic relationship, the capacitance characteristic relationship, the conductance characteristic relationship and the twisted-pair transmission characteristic transmitted by the AFDX bus so as to obtain the detection result of the AFDX bus. The system and the method provided by the invention can improve the reliability of the aviation communication bus and improve the airborne safety.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a structural diagram of a system for detecting transmission characteristics of an AFDX bus according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for detecting transmission characteristics of an AFDX bus according to an embodiment of the present invention;
fig. 3 illustrates an effect of resistance change on an error rate in detecting transmission characteristics of an AFDX bus according to an embodiment of the present invention;
fig. 4 illustrates an influence of inductance variation on the bit error rate in the detection of the transmission characteristics of the AFDX bus according to the embodiment of the present invention;
fig. 5 illustrates an effect of capacitance variation on an error rate in detecting transmission characteristics of an AFDX bus according to an embodiment of the present invention;
fig. 6 is a diagram illustrating the influence of the insulation medium parameter on the propagation speed of the signal caused by the change in the detection of the transmission characteristics of the AFDX bus according to the embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention develops a detection system and a detection method for transmission characteristics of an AFDX bus, and the detection system can analyze and calculate the transmission rate difference of the AFDX bus system caused by different transmission media by researching the influence rule of the material characteristics and the electrical characteristics of an airplane cable on the transmission process of a signal in the AFDX bus system. Meanwhile, in order to improve the overall quality of the AFDX system, a bit error rate calculation model is established to standardize the reliability of the system.
To facilitate understanding of the embodiment, first, a detailed description is given of a system and a method for detecting transmission characteristics of an AFDX bus according to the embodiment of the present invention.
As shown in fig. 1, the present invention provides a system for detecting transmission characteristics of an AFDX bus, comprising:
the system comprises a parameter real-time monitoring unit, an RGLC model building unit, a bus parameter configuration unit and a comparison output unit;
the parameter real-time monitoring unit is used for acquiring real-time parameters transmitted by the AFDX bus;
the acquired bus configuration parameters are used for acquiring bus associated parameters, and the bus associated parameters comprise resistance characteristic relation, capacitance characteristic relation and conductance characteristic relation of AFDX bus transmission;
the RGLC model building unit is used for acquiring the transmission characteristics of the twisted pair;
the comparison output unit is used for comparing the real-time parameters transmitted by the AFDX bus, the resistance characteristic relationship, the capacitance characteristic relationship and the conductance characteristic relationship transmitted by the AFDX bus and the transmission characteristics of the twisted pair so as to obtain the detection result of the AFDX bus.
Example two
As shown in fig. 2, a second embodiment of the present invention provides a method for detecting transmission characteristics of an AFDX bus, including the following steps:
the bus parameter configuration unit is used for acquiring bus associated parameters to acquire a first input quantity, the RGLC model building unit is used for acquiring twisted pair transmission characteristics to acquire a second input quantity, and the parameter real-time monitoring unit is used for acquiring real-time parameters of AFDX bus transmission to acquire a third input quantity;
in the present invention, the AFDX bus is a multi-strand twisted pair. Since the twisted pair is a non-uniform transmission line formed by twisting two wires having insulation protective layers with each other at a certain density, it is difficult to calculate parameters per unit length. However, because the two wires are twisted with each other, the two wires have symmetrical spatial structure and relatively fixed positions, so that each small segment of the two wires can be approximately regarded as a parallel double-wire analysis calculation. Two wires in the twisted pair are insulated from the ground, and each wire is also provided with an insulating sheath and insulated from each other. However, for practical reasons such as engineering and manufacturing, the resistance value which should be theoretically the insulation resistance cannot be infinite in practical use, so that there is leakage conductance between the two parallel conductors. The parallel double-conductor can be regarded as two polar plates of the capacitor because of mutual insulation. The inductance of a twisted pair can be used as the electromagnetic induction relationship between the internal and external inductances. The AFDX bus has a very low degree of coupling between the twisted pair loops, so the mutual inductance can also be approximately zero. The relationship among the capacitance, the resistance, the conductivity and the inductance can be analyzed to obtain the distribution parameters of the transmission medium, which are related to the length, the material parameters of the conductivity, the permeability and the wire diameter of the twisted pair, and particularly, the distribution parameters can be correspondingly changed due to extrusion, breakage, loss and the like in the using and manufacturing process.
And acquiring the first input quantity, the second input quantity and the third input quantity by using the comparison output unit, and comparing the first input quantity, the second input quantity and the third input quantity to acquire a detection result of AFDX bus transmission.
Example three:
the third embodiment of the present invention explains the first input quantity, and further, the first input quantity is expressed as:
F10＝{R、G、L、C}；
wherein the content of the first and second substances,
Figure BDA0002534604990000111
G＝CtanD＝2πfCtanD，
Figure BDA0002534604990000112
in the formula, R is resistance information on a bus unit length;
l is inductance information on the unit length of the bus;
Lrinformation of the internal inductance;
Lois external inductive information;
c is capacitance information of the bus in unit length;
g is conductance information of the bus in unit length;
d is the central distance between the two conductors;
d is the conductor diameter;
σ is the conductivity of the conductor;
f is the signal transmission frequency of the conductor;
mu is the magnetic permeability of the conductor;
μris LrMagnetic permeability of (2);
mu o is LoMagnetic permeability of (2);
ris LrThe vacuum dielectric constant of (a);
ois LoThe vacuum dielectric constant of (a);
Dis the equivalent loss angle of the insulating medium.
Example four:
the fourth embodiment of the present invention illustrates the aforementioned second input quantity, and further,
and the second input quantity is as follows:
Figure BDA0002534604990000121
in the formula
R1A direct current resistance per unit length of one wire;
R2a direct current resistance per unit length of the second wire;
R0a direct current resistance per unit length of the shielding layer;
L11is mutual inductance between the first wire and the shielding layer;
L22mutual inductance between the second wire and the shielding layer;
L12the mutual inductance between the first wire and the second wire;
C11the capacitance between the first conducting wire and the shielding layer;
C22the capacitance between the second wire and the shielding layer;
C12the capacitance between the first wire and the second wire;
G11is the conductance between the first wire and the shield;
G22is the conductance between the second wire and the shielding layer;
G12is the electrical conductance between the first wire and the second wire.
Preferably, the step of comparing the first input quantity, the second input quantity and the third input quantity to obtain the detection result of the AFDX bus transmission includes:
the real-time error rate of the AFDX bus system is obtained by adopting the following formula:
Figure BDA0002534604990000131
wherein BER is bit error rate;
q is a function 1- Φ (x);
phi (x) is a normal distribution function;
b is the equivalent bandwidth of the receiving filter;
s is the average power of the signal;
n is noise power;
p is the signal-to-noise ratio.
Preferably, the detection system for the transmission characteristics of the AFDX bus is stored in a computer, and in the actual detection process, the detection system is clamped on the AFDX bus through a clamp to acquire data information, so that the application is convenient.
On an AFDX bus transmission characteristic calculation platform based on a transmission line, firstly, in a detection time period, a plurality of transmission characteristic parameters F of an AFDX bus are obtainedinDigitizing each parameter (namely, operating a bus parameter configuration unit and a parameter real-time detection unit), then operating an RGLC model construction unit, and starting a system comparison output unit 40;
in the real-time detection state, the influence curves of various transmission characteristic parameters on the error rate and the influence of the change of the insulating medium parameter on the signal propagation speed in fig. 6 can be respectively detected and obtained as shown in fig. 3, 4 and 5.
Unless specifically stated otherwise, the relative steps, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (5)

1. An AFDX bus transfer characteristic detection system, comprising:
the system comprises a parameter real-time monitoring unit, an RGLC model building unit, a bus parameter configuration unit and a comparison output unit;
the parameter real-time monitoring unit is used for acquiring real-time parameters transmitted by the AFDX bus;
the acquired bus configuration parameters are used for acquiring bus associated parameters, and the bus associated parameters comprise resistance characteristic relation, capacitance characteristic relation and conductance characteristic relation of AFDX bus transmission;
the RGLC model building unit is used for acquiring the transmission characteristics of the twisted pair;
the comparison output unit is used for comparing the real-time parameters transmitted by the AFDX bus, the resistance characteristic relationship, the capacitance characteristic relationship and the conductance characteristic relationship transmitted by the AFDX bus and the transmission characteristics of the twisted pair so as to obtain the detection result of the AFDX bus.
2. A method for detecting the transmission characteristics of an AFDX bus according to claim 1, comprising the steps of:
the bus parameter configuration unit is used for acquiring bus associated parameters to acquire a first input quantity, the RGLC model building unit is used for acquiring twisted pair transmission characteristics to acquire a second input quantity, and the parameter real-time monitoring unit is used for acquiring real-time parameters of AFDX bus transmission to acquire a third input quantity;
and acquiring the first input quantity, the second input quantity and the third input quantity by using the comparison output unit, and comparing the first input quantity, the second input quantity and the third input quantity to acquire a detection result of AFDX bus transmission.
3. The method of claim 1, wherein the first input quantity is represented as:
F10＝{R、G、L、C}；
wherein the content of the first and second substances,
Figure FDA0002534604980000021
G＝C tanD＝2πfC tanD，
Figure FDA0002534604980000022
in the formula, R is resistance information on a bus unit length;
l is inductance information on the unit length of the bus;
Lrinformation of the internal inductance;
Lois external inductive information;
c is capacitance information of the bus in unit length;
g is conductance information of the bus in unit length;
d is the central distance between the two conductors;
d is the conductor diameter;
σ is the conductivity of the conductor;
f is the signal transmission frequency of the conductor;
mu is the magnetic permeability of the conductor;
μris LrMagnetic permeability of (2);
mu o is LoMagnetic permeability of (2);
ris LrThe vacuum dielectric constant of (a);
ois LoThe vacuum dielectric constant of (a);
Dis the equivalent loss angle of the insulating medium.
4. The method of claim 2, wherein the second input quantity is:
Figure FDA0002534604980000031
in the formula:
R1a direct current resistance per unit length of one wire;
R2a direct current resistance per unit length of the second wire;
R0a direct current resistance per unit length of the shielding layer;
L11is mutual inductance between the first wire and the shielding layer;
L22mutual inductance between the second wire and the shielding layer;
L12the mutual inductance between the first wire and the second wire;
c11the capacitance between the first conducting wire and the shielding layer;
C22the capacitance between the second wire and the shielding layer;
c12the capacitance between the first wire and the second wire;
G11is the conductance between the first wire and the shield;
G22is the conductance between the second wire and the shielding layer;
G12is the electrical conductance between the first wire and the second wire.
5. The method of claim 2, wherein the step of comparing the first input, the second input, and the third input to obtain the result of detecting the AFDX bus transmission comprises:
the real-time error rate of the AFDX bus system is obtained by adopting the following formula:
Figure FDA0002534604980000041
wherein BER is bit error rate;
q is a function 1- Φ (x);
phi (x) is a normal distribution function;
b is the equivalent bandwidth of the receiving filter;
s is the average power of the signal;
n is noise power;
p is the signal-to-noise ratio.
CN202010529194.XA 2020-06-11 2020-06-11 AFDX (avionics full Duplex switched Ethernet) bus transmission characteristic detection system and method Pending CN111770001A (en)

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CN113630267A (en) * 2021-07-16 2021-11-09 江苏徐工工程机械研究院有限公司 Communication system simulation evaluation method and system suitable for energy consumption control system
CN113630267B (en) * 2021-07-16 2023-09-05 江苏徐工工程机械研究院有限公司 Communication system simulation evaluation method and system suitable for energy consumption control system
CN115001574A (en) * 2022-05-24 2022-09-02 淮南文峰航天电缆有限公司 Parallel interconnection optical communication network component detection system
CN115001574B (en) * 2022-05-24 2023-07-11 淮南文峰光电科技股份有限公司 Parallel interconnection optical communication network component detection system

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Application publication date: 20201013