CN102857389A - Frequency domain distortion prediction channel modeling method of 1553B bus - Google Patents
Frequency domain distortion prediction channel modeling method of 1553B bus Download PDFInfo
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Abstract
The invention belongs to the technical field of communication and discloses a frequency domain distortion prediction channel modeling method of 1553B bus. By the aid of the method, a frequency domain distortion prediction model reflects that parameters change with frequency domains and topological structures can be combined flexibly. The method comprises steps of decomposing Manchester codes which serve as input signals typically to a group of sinusoidal signals, regarding all sinusoidal signals as input, inputting the sinusoidal signals to a 1553B bus system, solving transmission functions of any nodes, obtaining sinusoidal signals of all output, superposing the group of signals so as to predict signal distortion degrees and removing nodes of high signal distortion degrees, i.e., unavailable nodes. The method is mainly applied to the obtaining of the distortion prediction module of the 1553B bus system.
Description
Technical field
The invention belongs to communication technical field, specifically belong to the comprehensive avionics system of military aircraft, store Combinations management and integrated system, and progressively expand on the platforms such as Aerospace Electronics System, military boats and ships and armored vehicle the i.e. frequency domain distortion predicted channel modeling method of 1553B bus.
Background technology
In the sixties in 20th century, the integration fire control system that is formed by navigation, level, weapon-aiming system etc., and mix remote sky and penetrate weapon, make fighter plane further strengthened.But along with operational information data total amount rises suddenly and sharply, because the interface of modules is different in the system, brought more challenge for the cable that connects modules.Constantly complicated along with the airborne electronic equipment system, telecommunication cable will take very large space and weight and also comparatively complicated to definition and the test of transmission line, and expense is higher.In order to address this problem, the U.S. SAE committee determines the signal multiplex system of exploitation standard in nineteen sixty-eight under the military and all circles' support.And announced the MIL-STD-1553 standard in 1973.China has also just begun research and the product development work of 1553 agreements as far back as the nineties, and has formulated the mark GJB 289A " digital time-devision system instruction/response type multiplex data bus " of army.The 1553B multiplex data bus becomes following military secret with the technology that adopts, and it has replaced the bulky equipment of transmitting data between transducer, computer, indicating device and other airplane equipments, has greatly reduced the weight of aircraft, and uses simple, flexible.
The channel of 1553B bus is comprised of leader cable, coupler and stub, and each terminal of system links to each other with stub and accesses leader cable by coupler.The 1553B leader cable adopts 70 to 85 ohm of Shielded Twisted Pairs, and the power loss under the 1MHz signal function is no more than 0.05dB/m, and the loss that causes is also not serious.But the junction of coupler and main cables and terminal all can cause the reflection of signal, as shown in Figure 1.Signal reflex is returned behind the leader cable and signal before stack will cause frequency selective fading, makes channel performance deteriorate significantly [1].In addition, the reflection of signal must cause the prolongation of channel impulse response, adds the impact of the intrinsic distributed capacitance of cable, and this channel can produce serious intersymbol interference.Therefore channel model not only wants to reflect the transmission characteristic between system's arbitrary node, phenomenon that also should be able to the reproducing signal distortion.
The 1553B bus system is widely used, and topological structure is different in different application, its general topological structure as shown in Figure 2, wherein the length of bus, terminal quantity and stub length are all variable, and the characteristic of terminate load is different.Therefore, the signal distortion degree between each node is difficult to describe with closed form.
In actual applications, external DDC company has realized in the 1553B bus system having tested the frequency domain response waveform [2-3] of 1553B bus on the basis of 80～120Mbps speed.The actual measurement channel frequency response as shown in Figure 3.Although can not reflect complete transmission characteristic, as deep fade phenomenon as shown at right occur, it is unavailable then to characterize between two nodes surveying the characteristic of channel, needs need to avoid in design this topological structure.
But, the method is for certain specific topological structure, actual measurement provides based on channel channel time domain or frequency domain response model, but can't be from decline and the distortion between the angle prediction different topology structure lower node that instructs bus topolopy, so that the flexibility in use of this model has been subject to great impact.
If the signal distortion degree between arbitrary node under the various topological structures of Accurate Prediction, and instruct accordingly the Topology Structure Design of bus, then can avoid designing disabled terminal node, improve systematic function.Therefore, bus distortion prediction model is significant under the design different topology structure.
On this basis, if further set up complete channel model, with the transmission characteristic between the transfer function characterization system node, then can infer accordingly the characteristics of channel such as multipath effect, transmission delay, intersymbol interference, with the radio frequency of this guidance system level and processing method and the parameter value of base band, then can greatly improve the overall performance of system.
Modeling technique to twisted-pair feeder in the ADSL technology is relatively ripe, and such as RLCG model and ABCD model [4], (wherein the representative of RLCG model is led represented model by equivalent resistance, inductance, electric capacity, the electricity of twisted-pair feeder.The transmission matrix model of ABCD model representation twisted-pair feeder).The modeling method of RLCG model has two kinds: 1) resolve the RLCG model: ignore electricity and lead effect, and suppose that inductance and electric capacity are not with the constant of frequency change, actual measured results is converted to the RLCG parameter of module; 2) numerical value RLCG model: carry out numerical computations based on Theory of Electromagnetic Field, find the solution by the Maxwell equation group under the specific border condition, calculate the RLCG parameter of module.
Twisted-pair feeder can equivalence be RLCG model as shown in Figure 4.RLCG parameter in the model can be tried to achieve by analytic method (single-frequency point mensuration) and numerical method (finite element analysis+FDTD method, odd-even mode analytical method) respectively, and wherein FDTD represents the Finite Difference-Time Domain separating method.
The RLCG model of coupler as shown in Figure 5.Need measure in actual applications the parameters in the model, bring model into.
Obtain respectively the RLCG model of twisted-pair feeder and the RLCG model of coupler, obtain again the RLCG model of system according to bus topolopy.
And the ABCD model refers to the transmission characteristic that characterizes each module with a two-port network.It is a black box that the modules of channel is regarded as, characterizes the characteristic of channel with input/output relation.According to Cascade System and topological structure in parallel, derivation system mode.
Domestic Xian Electronics Science and Technology University has proposed the method based on ADS software emulation channel, and twisted-pair feeder and the coupler parameter that will obtain under certain frequency are brought model into, is used for the system responses [5] of emulation 1553 buses.
More than based on the parameter in the modeling method of parameter all certain fixedly under the frequency by measuring or electromagnetism calculates, and the value of lumped parameter has certain deviation under different frequency, therefore also can bring the inaccuracy of model.
[1]Michael?G.Hegarty.MIL-STD-1553?Evolves?with?the?Times[R].2010.http://www.ddc-web.com/FileLibrary/Whitepapers.aspx#MIL-STD-1553
[2]Michael?G.Hegarty.High?performance?1553：A?feasibility?study[C].Digital?Avionics?Systems?Conference.2004.
[3]Mike?Glass，Buses?and?Networks?for?Contemporary?Avionics?White?Paper，Data?Device?Cooperation，November?2007.
[4] John M.Cioffi, dragon rises, Liu Feng, xDSL technology and application, Electronic Industry Press, 2002.ISBN7-5053-7493-1/TN
[5] seek and build sunshine, the modeling and simulation of 1553B bus system, Xian Electronics Science and Technology University's master thesis, 2011.1.
Summary of the invention
Existing frequency domain response model is the measured result under certain special topological structure, and existing parameter model then is value and suppose that parameter is not with frequency change under certain characteristic frequency.The present invention is intended to overcome the deficiencies in the prior art, but proposition can embody parameter with the frequency domain distortion forecast model of frequency domain variation and topological structure flexible combination, for achieving the above object, the technical scheme that the present invention takes is, the frequency domain distortion predicted channel modeling method of 1553B bus, comprise the steps: first typical Manchester code as input signal to be decomposed into one group of sinusoidal signal, and with each sinusoidal signal as input, be input to the 1553B bus system, solve the sinusoidal signal that draws each output behind the transfer function between arbitrary node, superpose this group signal with the prediction signal degree that distorts, thereby can get rid of the large node of signal distortion degree, namely unavailable node.
Described step further is refined as:
1. the Manchester code that is 20bit with typical input signal S adds synchronous head and makes period expansion, tries to achieve its Fourier series;
2. choose abundant frequency, make the signal Si (fi) of stack approach primary signal S, wherein Si (fi) is illustrated in i multifrequency sinusoid input signal under the frequency fi;
3. recording the RLCG parameter of each several part under above-mentioned each frequency on the bus, is lumped circuit with the equivalence of bus system each several part, solves internodal transfer function;
4. solve successively the output of each frequency component among the Si (fi);
The output of each frequency component that 5. superposes obtains SO (fi), compares with Si, and prediction distortion degree, wherein SO (fi) is illustrated in the output signal under the frequency fi;
Independently obtain system model under this frequency with RLCG model or ABCD model under the frequency at each, predicting end to end distortion by the stack of different frequency.
Record that the RLCG parameter of each several part under above-mentioned each frequency is specially on the bus:
(1) adopt following methods to obtain the RLCG parameter of twisted-pair shielded wire:
See the screen of twisted-pair shielded wire as another transfer wire, and it is considered as datum line, effect for reference; Whole twisted-pair feeder is regarded the form by two voltages and two electric current characterizeds as, by under different frequency, the voltage at twisted-pair feeder two ends, the measurement of current parameters value being measured the RLCG matrix parameter of twisted-pair feeder, in concrete topological structure, dz sets according to actual conditions, is set to unit length herein;
(2) method of testing of coupler is to use electric impedance analyzer, RLCG model measurement according to the coupler of 1553B special use goes out following parameter: magnetizing inductance L1, elementary leakage inductance L1d, secondary leakage inductance L2d, elementary distributed capacitance C1d, secondary distributed capacitance C2d, interwinding capacity C12, winding resistance R, core loss equivalent resistance RC; Concrete method of testing is as follows:
A. magnetizing inductance L1.Electric impedance analyzer inductance gear, the secondary open circuit of coupler records the inductance value under each frequency f i;
B. leakage inductance L1d, L2d ignore the impact of distributed capacitance, the coupler secondary short circuited, and also by short circuit, magnetizing current is very little according to principle of equal effects armature winding, and magnetizing inductance and core loss are tested the leakage inductance value under each frequency f i during much smaller than secondary open circuit;
C. capacitor C 12 between Transformer Winding is selected the electric capacity shelves, and with the respectively short circuit of primary and secondary winding, two arms of electric impedance analyzer are connected on respectively the opposite end of primary and secondary winding, and what measure between such two arms is exactly distributed capacitance between two windings;
D. distributed capacitance C1d, the C2d of primary and secondary winding.This electric capacity can't directly be measured, and can adopt the method for parallel resonant point to measure, in the situation of secondary open circuit, carry out frequency sweep in elementary impedance to coupler, obtain impedance curve, the peak point of curve is exactly magnetizing inductance and the coefficient resonance point of elementary distributed capacitance, utilizes formula
Calculate the elementary distributed capacitance of this moment, in like manner secondary;
E. core loss is measured with magnetizing inductance Rc, uses resistance grade, the same leakage inductance of the measuring principle of winding resistance, and difference also is to be transferred to resistance grade.
Technical characterstic of the present invention and effect:
The distortion prediction model that obtains in actual applications bus system is significant.At first, can before design, predict the signal distortion degree between arbitrary node under the various topological structures, and instruct accordingly the Topology Structure Design of bus, can avoid designing disabled terminal node, reduce product design, Time To Market.Secondly, channel model can instruct physical layer conceptual design and parameter to select the validity of Effective Raise system transmissions and reliability accurately.
Description of drawings
Fig. 1 signal distortion and loss.
Fig. 2 1553b system configuration.
The channel frequency response of Fig. 3 actual measurement.
The RLCG model of Fig. 4 twisted-pair feeder.
The RLCG model of Fig. 5 coupler.
Fig. 6 input signal decomposes.
Fig. 7 input signal approaches.
Fig. 8 distortion prediction model schematic diagram.
The RLCG parameter model of Fig. 9 twisted-pair feeder.
The method of testing schematic diagram of Figure 10 coupler.
Embodiment
Consider the lumped parameter of system with frequency change, and the 1553B topological structure is complicated, it is larger to set up complete channel model difficulty.According to the needs of practical application, the method for prediction baseband signal distortion degree can be provided, but not set up complete channel model.
First typical Manchester code as input signal is decomposed into one group of sinusoidal signal, and with each sinusoidal signal as input, solve the sinusoidal signal that draws each output behind the transfer function between arbitrary node, superpose this group signal with the prediction signal degree that distorts, thereby can get rid of the large node of signal distortion degree, namely unavailable node.
Modeling procedure is as follows:
1. typical input signal S (Manchester code of 20bit adds synchronous head) is made period expansion, try to achieve its Fourier series;
2. choose abundant frequency, make the signal Si (fi) of stack approach primary signal S;
3. recording the RLCG parameter of each several part under above-mentioned each frequency on the bus, is lumped circuit with the equivalence of bus system each several part, solves internodal transfer function;
4. solve successively the output of each frequency component among the Si;
The output of each frequency component that 5. superposes obtains SO, compares prediction distortion degree with Si.
With the input signal cyclic extensions, utilize fourier series to try to achieve characteristic frequency point.Choosing as shown in Figure 6 of characteristic frequency point.
With input signal rear and primary signal contrast in all characteristic frequency point stacks, as shown in Figure 7, distortion is also not obvious, and it is feasible as seen going to approach continuous frequency response with the method for frequency domain discrete analysis.
Independently obtain system model under this frequency with RLCG model or ABCD model under the frequency at each, predicting end to end distortion by the stack of different frequency.The general structure of systematic distortion forecast model as shown in Figure 8.
1. typical input signal S (Manchester code of 20bit adds synchronous head) is done period expansion according to T=20, and try to achieve the expression formula of its Fourier series.Be illustrated in figure 6 as the characteristic frequency point of input signal;
2. choose abundant frequency fi, approach primary signal S with a plurality of sinusoidal signal Si.Input signal is regarded what a series of sine waves with Fourier coefficient by this a few frequencies place were formed by stacking as;
3. recording the RLCG parameter of each element under above-mentioned each frequency on the bus, is lumped circuit with the equivalence of bus system each several part, solves internodal transfer function;
(1) the testing procedure more complicated of twisted-pair feeder, the external interference during test is also larger, and we can adopt following methods to obtain the RLCG parameter of twisted-pair shielded wire:
See the screen of twisted-pair shielded wire as another transfer wire, and it is considered as datum line, effect for reference.Whole twisted-pair feeder just can be regarded the form by two voltages and two electric current characterizeds as, measure the RLCG matrix parameter that just can draw twisted-pair feeder by the measurement to parameter values such as the voltage at twisted-pair feeder two ends, electric currents under different frequency, in concrete topological structure, dz can set with the tool actual conditions, is set to unit length herein.
(2) method of testing of coupler is to use electric impedance analyzer, RLCG model measurement according to the coupler of 1553B special use goes out following parameter: magnetizing inductance L1, elementary leakage inductance L1d, secondary leakage inductance L2d, elementary distributed capacitance C1d, secondary distributed capacitance C2d, interwinding capacity C12, winding resistance R, core loss equivalent resistance RC.Concrete method of testing is as follows:
A. magnetizing inductance L1.Electric impedance analyzer inductance gear, the secondary open circuit of coupler records the inductance value under each frequency f i;
B. leakage inductance L1d, L2d.Ignore the impact of distributed capacitance, the coupler secondary short circuited, also by short circuit, magnetizing current is very little according to principle of equal effects armature winding, and magnetizing inductance and core loss are tested the leakage inductance value under each frequency f i during much smaller than secondary open circuit;
C. capacitor C 12 between Transformer Winding.Select the electric capacity shelves, with the respectively short circuit of primary and secondary winding, two arms of electric impedance analyzer are connected on respectively the opposite end of primary and secondary winding, and what measure between such two arms is exactly distributed capacitance between two windings;
D. distributed capacitance C1d, the C2d of primary and secondary winding.This electric capacity can't directly be measured, and can adopt the method for parallel resonant point to measure, in the situation of secondary open circuit, carry out frequency sweep in elementary impedance to coupler, obtain impedance curve, the peak point of curve is exactly magnetizing inductance and the coefficient resonance point of elementary distributed capacitance, utilizes formula
Calculate the elementary distributed capacitance of this moment.In like manner secondary.
E. core loss is measured with magnetizing inductance Rc, uses resistance grade.The same leakage inductance of the measuring principle of winding resistance, difference also is to be transferred to resistance grade.
So far, the every part in the bus system topological structure between the node can represent with rlc circuit, as shown in Figure 5.Choose any two nodes respectively as input and output, calculate the transfer function between the end end.
4. solve successively the output of each frequency component among the Si;
The output of each frequency component that 5. superposes obtains SO, compares prediction distortion degree with Si.
Claims (3)
1. the frequency domain distortion predicted channel modeling method of a 1553B bus, it is characterized in that, comprise the steps: the frequency domain distortion predicted channel modeling method of 1553B bus, comprise the steps: first typical Manchester code as input signal to be decomposed into one group of sinusoidal signal, and with each sinusoidal signal as input, be input to the 1553B bus system, solve the sinusoidal signal that draws each output behind the transfer function between arbitrary node, superpose this group signal with the prediction signal degree that distorts, thereby can get rid of the large node of signal distortion degree, namely unavailable node.
2. the frequency domain distortion predicted channel modeling method of 1553B bus as claimed in claim 1 is characterized in that described step further is refined as:
1. the Manchester code that is 20bit with typical input signal S adds synchronous head and makes period expansion, tries to achieve its Fourier series;
2. choose abundant frequency, make the signal Si (fi) of stack approach primary signal S, wherein Si (fi) is illustrated in i multifrequency sinusoid input signal under the frequency fi;
3. recording the RLCG parameter of each several part under above-mentioned each frequency on the bus, is lumped circuit with the equivalence of bus system each several part, solves internodal transfer function;
4. solve successively the output of each frequency component among the Si (fi);
The output of each frequency component that 5. superposes obtains SO (fi), compares with Si, and prediction distortion degree, wherein SO (fi) is illustrated in the output signal under the frequency fi;
Independently obtain system model under this frequency with RLCG model or ABCD model under the frequency at each, predicting end to end distortion by the stack of different frequency.
3. the frequency domain distortion predicted channel modeling method of 1553B bus as claimed in claim 1 is characterized in that, records that the RLCG parameter of each several part under above-mentioned each frequency is specially on the bus:
(1) adopt following methods to obtain the RLCG parameter of twisted-pair shielded wire:
See the screen of twisted-pair shielded wire as another transfer wire, and it is considered as datum line, effect for reference; Whole twisted-pair feeder is regarded the form by two voltages and two electric current characterizeds as, by under different frequency, the voltage at twisted-pair feeder two ends, the measurement of current parameters value being measured the RLCG matrix parameter of twisted-pair feeder, in concrete topological structure, dz sets according to actual conditions, is set to unit length herein;
(2) method of testing of coupler is to use electric impedance analyzer, RLCG model measurement according to the coupler of 1553B special use goes out following parameter: magnetizing inductance L1, elementary leakage inductance L1d, secondary leakage inductance L2d, elementary distributed capacitance C1d, secondary distributed capacitance C2d, interwinding capacity C12, winding resistance R, core loss equivalent resistance RC; Concrete method of testing is as follows:
A. magnetizing inductance L1.Electric impedance analyzer inductance gear, the secondary open circuit of coupler records the inductance value under each frequency f i;
B. leakage inductance L1d, L2d ignore the impact of distributed capacitance, the coupler secondary short circuited, and also by short circuit, magnetizing current is very little according to principle of equal effects armature winding, and magnetizing inductance and core loss are tested the leakage inductance value under each frequency f i during much smaller than secondary open circuit;
C. capacitor C 12 between Transformer Winding is selected the electric capacity shelves, and with the respectively short circuit of primary and secondary winding, two arms of electric impedance analyzer are connected on respectively the opposite end of primary and secondary winding, and what measure between such two arms is exactly distributed capacitance between two windings;
D. distributed capacitance C1d, the C2d of primary and secondary winding.This electric capacity can't directly be measured, and can adopt the method for parallel resonant point to measure, in the situation of secondary open circuit, carry out frequency sweep in elementary impedance to coupler, obtain impedance curve, the peak point of curve is exactly magnetizing inductance and the coefficient resonance point of elementary distributed capacitance, utilizes formula
Calculate the elementary distributed capacitance of this moment, in like manner secondary;
E. core loss is measured with magnetizing inductance Rc, uses resistance grade, the same leakage inductance of the measuring principle of winding resistance, and difference also is to be transferred to resistance grade.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103226166A (en) * | 2013-03-21 | 2013-07-31 | 天津大学 | Shielded twisted pair RLCG model and computational method of transfer characteristic thereof |
| CN104808620A (en) * | 2015-03-09 | 2015-07-29 | 中国航空工业集团公司沈阳飞机设计研究所 | GJB289A serial bus-based distributed aircraft management system architecture |
| CN105450433A (en) * | 2014-08-18 | 2016-03-30 | 华为技术有限公司 | Method, device, and system for configuring high-speed serial bus parameter |
| CN107273325A (en) * | 2017-05-04 | 2017-10-20 | 上海空间电源研究所 | Applied to turning end and fixing end 1553B bus transmission methods |
| CN108521348A (en) * | 2018-06-04 | 2018-09-11 | 西安太世德航空电器有限公司 | A kind of 1553B bus network test system and method |
| CN110247715A (en) * | 2018-06-26 | 2019-09-17 | 北京航空航天大学 | A kind of detection system suitable for ARINC429 bus transfer characteristic |
-
2012
- 2012-08-07 CN CN2012102797777A patent/CN102857389A/en active Pending
Non-Patent Citations (1)
| Title |
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| LIGANG CHEN等: "A novel method for evaluating the attenuation of 1553B bus system", 《2012 7TH INTERNATIONAL CONFERENCE ON COMPUTER SCIENCE & EDUCATION(ICCSE)》 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103226166A (en) * | 2013-03-21 | 2013-07-31 | 天津大学 | Shielded twisted pair RLCG model and computational method of transfer characteristic thereof |
| CN103226166B (en) * | 2013-03-21 | 2015-05-27 | 天津大学 | Computational method of transfer characteristic of shielded twisted pair RLCG |
| CN105450433A (en) * | 2014-08-18 | 2016-03-30 | 华为技术有限公司 | Method, device, and system for configuring high-speed serial bus parameter |
| CN105450433B (en) * | 2014-08-18 | 2018-07-31 | 华为技术有限公司 | Configuration method, the device and system of high-speed serial bus parameter |
| CN104808620A (en) * | 2015-03-09 | 2015-07-29 | 中国航空工业集团公司沈阳飞机设计研究所 | GJB289A serial bus-based distributed aircraft management system architecture |
| CN107273325A (en) * | 2017-05-04 | 2017-10-20 | 上海空间电源研究所 | Applied to turning end and fixing end 1553B bus transmission methods |
| CN107273325B (en) * | 2017-05-04 | 2020-04-14 | 上海空间电源研究所 | 1553B bus transmission method applied to rotating end and fixed end |
| CN108521348A (en) * | 2018-06-04 | 2018-09-11 | 西安太世德航空电器有限公司 | A kind of 1553B bus network test system and method |
| CN108521348B (en) * | 2018-06-04 | 2023-04-07 | 西安太世德航空电器有限公司 | 1553B bus network test system and method |
| CN110247715A (en) * | 2018-06-26 | 2019-09-17 | 北京航空航天大学 | A kind of detection system suitable for ARINC429 bus transfer characteristic |
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