CN112130123A - Simulation method and system of weather radar pulse modulator - Google Patents

Simulation method and system of weather radar pulse modulator Download PDF

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Publication number
CN112130123A
CN112130123A CN202010931601.XA CN202010931601A CN112130123A CN 112130123 A CN112130123 A CN 112130123A CN 202010931601 A CN202010931601 A CN 202010931601A CN 112130123 A CN112130123 A CN 112130123A
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pulse modulator
unit
modeling
current
pulse
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CN112130123B (en
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李学华
王思寒
何建新
邵楠
步志超
段寿元
关宇
陈俊
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Chengdu University of Information Technology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/40—Means for monitoring or calibrating
    • G01S7/4004—Means for monitoring or calibrating of parts of a radar system

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  • Radar, Positioning & Navigation (AREA)
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Abstract

The invention provides a simulation method and a system of a weather radar pulse modulator; the method comprises the following steps: s1: modeling the appearance interface design of a simulation component of a weather radar pulse modulator; s2: and (4) simulating a functional algorithm of the weather radar pulse modulator. The method starts from two parts of the design modeling of the peripheral interface of the modulator assembly and the simulation of the functional algorithm of the modulator, and can simulate the main functions and the performances of weather radar pulse modulators of various models by flexibly adjusting configuration parameters.

Description

Simulation method and system of weather radar pulse modulator
Technical Field
The invention belongs to the technical field of simulation, and particularly relates to a simulation method and system of a weather radar pulse modulator.
Background
The weather radar pulse modulator is an important component of a radar transmitter, and mainly has the main function of generating negative-polarity modulation pulses meeting requirements, boosting the negative-polarity modulation pulses through a pulse transformer, and adding the negative-polarity modulation pulses to the cathode of a klystron to provide voltage and energy required by the operation of the klystron. Currently, the simulation of weather radar pulse modulators is based on electronic circuit level, predicting the performance of the modulator through computer aided analysis. However, because the simulation method is based on the electronic circuit, the simulation method has the disadvantages of more components, low integration degree, long period and low operation speed, and cannot be widely popularized in the simulation of the radar system.
In addition, some weather radar pulse modulator simulation methods only simulate the performance and the waveform of a key point, but do not simulate the fault of the key point; or some weather radar pulse modulator simulation methods, the modulator for modeling cannot be independently formed into components, cannot be repeatedly called, cannot be configured with parameters, does not provide an input/output interface, and cannot be combined with other components to construct the whole radar system for computer simulation.
The invention provides a simulation method of a weather radar pulse modulator, which can generate relevant key point waveforms and modulation pulses of the modulator and also simulate fault points of the modulator.
Disclosure of Invention
In view of the above, an objective of the present invention is to provide a simulation method for a weather radar pulse modulator, which can simulate the main functions of the weather radar pulse modulator.
In order to achieve the purpose, the technical scheme of the invention is as follows: a simulation method of a weather radar pulse modulator comprises the following steps:
s1: modeling the appearance interface design of a simulation component of a weather radar pulse modulator;
s2: simulating a functional algorithm of a weather radar pulse modulator;
wherein, step S1 specifically includes:
s11: designing an external interface of a pulse modulator simulation component according to actual input and output interfaces of weather radar pulse modulators of different models;
s12: configuring parameters of the pulse modulator simulation component;
s13: designing the package of the pulse modulator simulation component by using the outline package diagram;
step S2 specifically includes:
s20: modeling a pulse modulator energization current;
s21: modeling a pulse modulator charging current;
s22: modeling the artificial line charging voltage of the pulse modulator;
s23: modeling the inverse peak current of the pulse modulator;
s24: modeling the pulse modulator output voltage;
s25: modeling a pulse modulator power supply module according to power supply conditions required by different weather radar pulse modulators;
s26: modeling a pulse modulator trigger signal;
s27: modeling the overvoltage fault of the artificial line voltage of the pulse modulator;
s28, modeling the pulse modulator peak inversion overcurrent fault;
s29: and modeling the time sequence relation among various waveforms of the pulse modulator.
Further, the pulse modulator simulation component external interface outputs through a time-dependent data stream.
Further, the energization current in said step S21 is varied according to the following formula:
Figure BDA0002669199110000021
wherein I is an energizing current, V0Is power supply voltage, t is energizing time, L1Is the primary inductance value.
Further, the charging current in the step S22 is modeled as follows:
Figure BDA0002669199110000022
wherein, I2For charging current, t2For charging time, ωdFor complex frequency of the circuit, alpha being the natural frequency of the energized current circuit, B1A charge initiation current that is a narrow pulse.
Further, the artificial line charging voltage in step S23 is modeled as follows:
Figure BDA0002669199110000023
wherein, CNIs an artificial line capacitor.
Further, the inverse peak current in the step S24 is modeled as follows:
Figure BDA0002669199110000031
wherein ifn(τ) is the inverse peak current, Ufn(τ) is the inverse peak step voltage amplitude, RfIs inverse peak resistance, UNIs artificial line voltage, Rlρ is the artificial line impedance, n is the order, and τ is the time.
Further, the output voltage in step S25 is modeled as follows:
Figure BDA0002669199110000032
wherein, KuIs a reflection coefficient, UNIs the artificial line voltage.
The invention also aims to provide a simulation system of the weather radar pulse modulator, which can simulate the main functions and performances of the weather radar pulse modulator.
In order to achieve the purpose, the technical scheme of the invention is as follows: a simulation system for a weather radar pulse modulator, comprising: the external interface module is used for designing the appearance interface of the simulation component of the modulator, and the functional algorithm module is used for designing the generation of the waveform of the key point of the modulator and the generated conditions;
wherein the external interface module includes:
the external interface unit is used for designing an external interface of the pulse modulator simulation component according to actual input and output interfaces of weather radar pulse modulators of different models;
the component parameter unit is connected with the external interface unit and is used for configuring parameters of the pulse modulator simulation component;
the packaging unit is connected with the external interface unit and the component parameter unit and used for designing the packaging of the pulse modulator simulation component by using the appearance packaging diagram;
the storage unit is connected with the packaging unit and used for storing the pulse modulator simulation components after being packaged;
the functional algorithm module is connected with the storage unit and comprises:
an energization current unit for modeling a pulse modulator energization current;
the charging current unit is connected with the enabling current unit and used for modeling the charging current of the pulse modulator;
the artificial line charging voltage unit is connected with the charging current unit and used for modeling the artificial line charging voltage of the pulse modulator;
the inverse peak current unit is connected with the artificial line charging voltage unit and used for modeling inverse peak current of the pulse modulator;
the output voltage unit is connected with the artificial line charging voltage unit and used for modeling the output voltage of the pulse modulator;
the power module unit is used for modeling the pulse modulator power module according to power conditions required by different weather radar pulse modulators;
the trigger signal unit is connected with the charging current unit and the output voltage unit and used for modeling a pulse modulator trigger signal;
the voltage overvoltage fault unit is connected with the artificial line charging voltage unit and used for modeling the artificial line voltage overvoltage fault of the pulse modulator, and outputting the artificial line voltage overvoltage fault if the artificial line charging voltage exceeds an external parameter artificial line voltage threshold value of the simulation component;
the peak-reversal overcurrent fault unit is connected with the peak-reversal current unit and used for modeling peak-reversal overcurrent faults of the pulse modulator, and outputting peak-reversal current overcurrent faults when the peak-reversal current exceeds an external parameter peak-reversal current threshold value of the simulation component;
and the waveform time sequence unit is used for modeling the time sequence relation among all waveforms of the pulse modulator.
Further, a pulse modulator emulation component in the external interface unit is output by the external interface through a time-dependent data stream.
Further, an energization current model in the energization current is:
Figure BDA0002669199110000041
wherein I is an energizing current, V0Is power supply voltage, t is energizing time, L1Is the primary inductance value.
Compared with the prior art, the invention has the following advantages:
the invention provides a simulation method and a simulation system for a weather radar pulse modulator.
The simulation method starts from two parts of the design modeling of the peripheral interface of the modulator assembly and the simulation of the functional algorithm of the modulator, and can be used for carrying out simulation analysis on the function and the performance of the weather radar pulse modulator and simulating the fault phenomenon of key points of the weather radar pulse modulator; simultaneously, providing a model for generating a waveform of a key point of the modulator; the simulation method can also package the pulse modulator simulation component into a component with an input/output interface, and the component type building, storage management and dragging type calling are adopted, so that the simulation method is simple to use, flexible in configuration and reusable; the key parameters can be configured, the main functions and the performance of the weather radar pulse modulators of various models can be simulated by flexibly adjusting the configuration parameters, the external condition parameters corresponding to the weather radar pulse modulators of various models can be changed, but the modeling idea and the mathematical model calculation of the waveform are unchanged.
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. It is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive exercise.
FIG. 1 is a schematic structural diagram of a simulation system of a weather radar pulse modulator according to an embodiment of the present invention;
FIG. 2 is a flyback charging waveform;
FIG. 3 is a diagram of a model of an external interface of a simulation module of the pulse modulator;
FIG. 4 is a packaging diagram of an external interface component of the pulse modulator emulation component;
FIGS. 5a, 5b, and 5c show an actual circuit, a primary equivalent circuit, and t (0) of an energizing current, respectively+) A time equivalent circuit;
FIG. 6 is a graph of an energization current waveform in one embodiment;
FIG. 7 is a graph of a charge voltage waveform in one embodiment;
FIG. 8 is a diagram of an exemplary artificial line charging current waveform;
FIG. 9 is a graph of an exemplary inverse peak current waveform;
FIG. 10 is a waveform diagram illustrating an exemplary pulsed high voltage waveform output;
FIG. 11 is a waveform illustrating a flyback charging process according to an embodiment;
FIG. 12 is a waveform of an enabling pulse in an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. 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 examples are given for the purpose of better illustration of the invention, but the invention is not limited to the examples. Therefore, those skilled in the art should make insubstantial modifications and adaptations to the embodiments of the present invention in light of the above teachings and remain within the scope of the invention.
Example 1
Referring to fig. 1, a schematic structural diagram of a simulation system of a weather radar pulse modulator according to the present invention is shown, specifically, the system includes: the system comprises an external interface module 1 for designing the appearance interface of the simulation component of the modulator, and a functional algorithm module 2 for designing the generation of the waveform of key points of the modulator and generating conditions;
the external interface module 1 is used for modeling the design of the peripheral interface of the modulator, in the module, the input and output interfaces and configuration parameters of the components of the modulator are designed, and the external signal interface and parameters of the modulator are determined through the design of the peripheral interface of the components, so that the modulator can be used as a reusable component and can be repeatedly used and flexibly configured;
wherein, the external interface module 1 includes:
the external interface unit 10 is used for designing an external interface of the pulse modulator simulation component according to actual input and output interfaces of weather radar pulse modulators of different models;
in this embodiment, the external interface unit 10 is designed to be an external interface of a pulse modulator simulation component according to actual input and output interfaces of weather radar pulse modulators of different models, and the pulse modulator simulation component should have a power input, a charging trigger signal input, a discharging trigger signal input, a pulse width selection signal input, an enabling current sampling output, a charging current sampling output, a manual line charging voltage sampling output, an inverse peak current sampling output, a modulation pulse voltage output, an inverse peak current overcurrent fault output, a manual line charging voltage overvoltage fault output, a charging trigger signal fault output, a discharging trigger signal fault output, and a power supply fault output; each input and output should be in the form of signal stream, that is, the input and output data are output in the form of data stream with time relation, and have a certain time sequence relation, and the time sequence relation among all waveforms of the pulse modulator is controlled by the input trigger signal;
the component parameter unit 11 is connected with the external interface unit and is used for configuring parameters of the pulse modulator simulation component;
in this embodiment, the module parameter unit 11 makes the parameters related to the pulse modulator module in the external interface unit 10 configurable, and by modifying the parameters, changes in the internal relationship of the module can be implemented, so as to implement the main functions and fault simulation reproduction of pulse modulator modules of different models and different wave bands.
The packaging unit 12 is connected with the external interface unit 10 and the component parameter unit 11 and is used for designing the packaging of the pulse modulator simulation component by using the outline packaging diagram;
in this embodiment, an outline package diagram is used to represent the whole assembly, the package diagram can be represented by a square, a rectangle, etc., the left side of the diagram is a radio frequency input pin, the right side of the diagram is a radio frequency output pin and a heating power output pin, the upper and lower sides are a filament power input, a titanium pump power input, a pulse negative high voltage input and a magnetic field power input, the middle can be marked with an identification number, a name and a picture of a klystron, and parameters and ranges of the assembly are configured below the package diagram;
the storage unit 13 is connected with the packaging unit and used for storing the pulse modulator simulation components after being packaged;
through the encapsulation of the components in the encapsulation unit 12, the storage unit 13 stores the pulse modulator simulation components in the forms of component encapsulation, component models and the like as an independent component, stores the independent component in a transmitter component library, directly performs component instantiation in a dragging mode or a function calling mode from the library during calling, and can be used for multiple times or repeatedly, the components can be respectively configured with different parameters, and different results are realized;
the functional algorithm module 2 is connected with the storage unit 1, in the embodiment, the functional algorithm module 2 is used for generating waveforms of key points of the modulator and generating conditions, and simultaneously gives time sequence relations among the waveforms of the modulator, so that the working condition of the weather radar pulse modulator under the actual working condition can be realized through establishing the mathematical relations, and the output conditions of normal working and fault working of the weather radar pulse modulator can be simulated;
specifically, the functional algorithm module 2 includes:
an energizing current unit 20 for modeling the pulse modulator energizing current;
the transmitter is switched according to the pulse selection signal command by dividing the transmitter into a narrow pulse state and a wide pulse state, and in a specific embodiment, the energizing current model of the energizing current unit 20 is as follows:
Figure BDA0002669199110000071
wherein I is an energizing current, V0Is power supply voltage, t is energizing time, L1Is the primary inductance value;
a charging current unit 21 connected to the energizing current unit 20 for modeling the pulse modulator charging current;
specifically, the charging current model of the charging current unit 21 is:
Figure BDA0002669199110000072
wherein, I2For charging current, t2For charging time, ωdIs the complex frequency of the circuit, and alpha is the energizing current circuit natural frequency;
the artificial line charging voltage unit 22 is connected with the charging current unit and used for modeling the artificial line charging voltage of the pulse modulator;
specifically, the artificial line charging voltage model of the artificial line charging voltage unit 22 is:
Figure BDA0002669199110000081
wherein, CNIs an artificial line capacitor;
the inverse peak current unit 23 is connected with the artificial line charging voltage unit and used for modeling the inverse peak current of the pulse modulator;
specifically, the inverse peak current model of the inverse peak current unit 23 is:
Figure BDA0002669199110000082
wherein ifn(τ) is the inverse peak current, Ufn(τ) is the inverse peak step voltage amplitude, RfIs inverse peak resistance, UNIs artificial line voltage, RlIs load impedance, rho is artificial line impedance, n is order, and tau is time;
the output voltage unit 24 is connected with the artificial line charging voltage unit and used for modeling the output voltage of the pulse modulator;
specifically, the output voltage model of the output voltage unit 24 is:
Figure BDA0002669199110000083
wherein, KuIs a reflection coefficient, UNIs artificial line voltage;
the power module unit 25 is used for modeling a pulse modulator power module according to power conditions required by different weather radar pulse modulators;
in this embodiment, the power module model of the power module unit 25 can be modeled according to power conditions required by different weather radar pulse modulators, and if the power conditions do not meet the requirements, the pulse modulators cannot work normally;
the trigger signal unit 26 is connected with the charging current unit and the output voltage unit and used for modeling a pulse modulator trigger signal;
the trigger signal unit 26 is configured to establish a pulse modulator trigger signal model, and in one modulator, if there is no charging trigger signal, the modulator cannot perform charging and discharging, and the modulator outputs a charging fault; if the discharge trigger signal does not exist, the modulator cannot perform a discharge process, and the modulator outputs a discharge fault;
the voltage overvoltage fault unit 27 is connected with the artificial line charging voltage unit and used for modeling the artificial line voltage overvoltage fault of the pulse modulator, and outputting the artificial line voltage overvoltage fault if the artificial line charging voltage exceeds an external parameter artificial line voltage threshold value of the simulation component;
the inverse peak overcurrent fault unit 28 is connected with the inverse peak current unit and used for modeling the inverse peak overcurrent fault of the pulse modulator, and outputting the inverse peak current overcurrent fault when the inverse peak current exceeds an external parameter inverse peak current threshold value of the simulation component;
and a waveform timing unit 29 for modeling the timing relationship between the waveforms of the pulse modulator.
Referring to FIG. 2, a timing diagram of waveforms, t1To enable time, t2Is the charging time; the enabling current is required to wait until the charging trigger pulse arrives to start the flyback charging process, the enabling time is the same as the duration of the enabling pulse, and the modulation pulse output is required to wait until the discharging trigger pulse arrives to be output.
Example 2
Based on the system of embodiment 1, this embodiment discloses a simulation method of a weather radar pulse modulator, which includes the following steps:
s1: modeling the appearance interface design of a simulation component of a weather radar pulse modulator;
in this step, the weather radar pulse modulator module appearance interface needs to be designed and modeled, and the weather radar pulse modulator is modeled into a standard module, stored in a module library or a module model, and can be repeatedly called. The built pulse modulator component has the input and output interfaces consistent with pins of an actual weather radar pulse modulator as much as possible, has certain appearance and encapsulation, can be configured with parameters, and can be configured to adapt to the application requirements of weather radar pulse modulators with different models and different wave bands through parameter modification, and specifically comprises the following steps:
s11: designing an external interface of a pulse modulator simulation component according to actual input and output interfaces of weather radar pulse modulators of different models;
in the step, the relevant parameters are made configurable, the change of the internal relation of the components can be realized through the modification of the parameters, and the main functions and the fault simulation reproduction of the pulse modulator components with different models and different wave bands are realized. The parameters of the configuration comprise an anti-peak current fault threshold, an artificial line charging voltage threshold value, a charging transformer transformation ratio, a charging transformer primary inductor, a charging transformer secondary inductor, a narrow pulse artificial line capacitor, a wide pulse artificial line capacitor, a pulse repetition period and a modulation pulse voltage pulse width setting;
referring to fig. 3, in an embodiment, a model for establishing a component profile interface for an input and output interface relationship of a weather radar klystron is established, a profile interface design of the klystron is used, an arrow is directed to a signal flow direction, and main input and output interfaces in fig. 3 are: v _380, V _12 and V _ N12 are power supply 380V, 12V and-12V input respectively, PulseWidSel is pulse width selection signal input, ChargeTri is charging trigger signal input, PresetPulse is presetting pulse (discharging trigger pulse) input; EnableCUR is energized current output, PENCHCUR is manual line charging current output, PEN waveform is manual line voltage waveform output, INVCRUSMPling is inverse peak current sampling output, FNTimePulse is energized timing pulse, PENOVRVLT is manual line voltage overvoltage fault output, INVOVERCURLT is inverse peak current overcurrent fault output, MODHVout is modulation pulse high voltage output, and SCRTRIFLT is thyristor-triggered fault output.
S12: configuring parameters of a pulse modulator simulation component;
after the design of the external interface of the modulator assembly is finished, the related parameters are made to be configurable, the change of the internal relation of the assembly can be realized through the modification of the parameters, and the main functions and the fault simulation reproduction of the pulse modulator assemblies with different models and different wave bands can be realized. The parameters of the configuration comprise an anti-peak current fault threshold, an artificial line charging voltage threshold value, a charging transformer transformation ratio, a charging transformer primary inductor, a charging transformer secondary inductor, a narrow pulse artificial line capacitor, a wide pulse artificial line capacitor, a pulse repetition period and a modulation pulse voltage pulse width setting; for example, the threshold value INVCURTH of the peak-reversal current (the generated peak-reversal current exceeds the threshold value, the output of the peak-reversal current output fault occurs when the peak-reversal current exceeds the threshold value), the manual line voltage threshold value PENVTH (the generated manual line voltage exceeds the threshold value, the output of the manual line voltage overvoltage fault occurs when the manual line voltage exceeds the fault occurs when the manual line voltage outputs the fault), the transformation ratio N1 of the charging transformer, the primary inductance L1 of the charging transformer, the secondary inductance L2 of the charging transformer, the narrow pulse manual line capacitance Cn1, the wide pulse manual line capacitance Cn2, the pulse repetition period PRT, the setting of the high-voltage pulse width of the modulation pulse, and other parameter values modid are designed.
S13: designing the package of the pulse modulator simulation component by using the outline package diagram;
in this step, the whole pulse modulator simulation component can be represented by an outline package diagram, the package diagram can be represented by a square, a rectangle and the like, referring to fig. 4 specifically, the package diagram is an assembly package diagram in an embodiment, a radio frequency input pin is arranged on the left side of the diagram, a radio frequency output pin and a heating power output pin are arranged on the right side of the diagram, and a filament power supply input, a titanium pump power supply input, a pulse negative high voltage input and a magnetic field power supply input are arranged on the upper side and the lower side of the diagram; the middle part can mark the identification number, name and picture of the klystron, the parameters and range of the components are configured under the packaging diagram, and the parameter subnet 1 (subnet 1) under the figure 4 is the value of the parameter in a certain embodiment;
preferably, the method further comprises the following steps: managing and using the pulse modulator simulation component, namely storing the pulse modulator simulation component in the forms of component packaging, component models and the like as an independent component and storing the independent component in a transmitter component library; when calling, the components are instantiated in a dragging mode or a function calling mode directly from the library, and can be used for multiple times or repeatedly, the components can be respectively configured with different parameters, and different results are achieved.
S2: simulating a functional algorithm of a weather radar pulse modulator;
step S2 is mainly to implement the logic relationship between each input and output in step S1, and each output generates a corresponding pulse modulator key point waveform and a fault determination output according to the input logic relationship, in this embodiment, the generation of the modulator key point waveform is implemented by modeling, specifically:
s20: modeling a pulse modulator energization current;
the transmitter is divided into two states of narrow pulse and wide pulse, and is switched according to a pulse selection signal instruction, and in the embodiment, the enabling current is changed according to the following formula:
Figure BDA0002669199110000111
wherein I is an energizing current, V0Is power supply voltage, t is energizing time, L1The energizing current is caused by the circuit composed of the primary internal resistance, the sum of the primary distributed capacitance and the converted distributed capacitance to the primary and secondary, and the primary leakage inductance of the transformer, and the circuit diagram in this embodiment can refer to fig. 5 a-5C, as shown in fig. 5a, C1, C2 are the primary distributed capacitance, M is the mutual inductance of the pulse transformer, the transformation ratio is N, R1Is the equivalent resistance of the primary circuit, mainly the sum of the power supply internal resistance and the line resistance, R2Is a secondary load. For the convenience of circuit analysis, the equivalent circuit converted to the primary of the transformer is shown in FIG. 5b, where C is2、R2Become converted to a primary value(ii) a Wherein K is the coupling coefficient of the transformer, and has the following relation with the mutual inductance of the energized transformer:
Figure BDA0002669199110000112
due to the presence of the secondary charging diode, during energization, the secondary is equivalently open, and the energization start time t (0)+) When the primary inductor current is zero and the mutual inductance is considered as open circuit, the circuit can be further simplified to fig. 5 c; wherein R is the internal resistance of the source, L is the sum of the leakage inductance of the equivalent primary, and L is 2(1-K) L1(ii) a C is the sum of the converted primary distributed capacitance; then at the moment when the IGBT (insulated gate bipolar transistor) is turned on, i.e. t (0)+) At a time, the circuit current may be expressed by the following expression:
Figure BDA0002669199110000113
Figure BDA0002669199110000121
Figure BDA0002669199110000122
Figure BDA0002669199110000123
wherein, I2Current at the time of "spiking" for energizing current, B1Initial charging current of narrow pulse, B2The initial charging current is a narrow pulse and is determined by the initial condition that the current on the inductor is zero at the closing moment, namely B 10; alpha is the natural frequency, omega, of the energized current circuit0At the resonant angular frequency, omega, of the circuitdIs the complex frequency of the circuit, and L is the sum of the leakage inductance of the equivalent primary;
s21: modeling a pulse modulator charging current;
the artificial line voltage being secondaryFeeling L2Charging the artificial line capacitor, and setting the artificial line capacitor with narrow pulse as C1And the wide pulse artificial line has a capacitance of C2It can be calculated completely by using LC resonance circuit formula. At the charging start time t (0)+) Assuming the starting time artificial line voltage Un(0) When the charging start current B is 0, a narrow pulse can be calculated1Wide pulse charging start current B2，
According to the second-order response calculation of the series-parallel RLC circuits, the charging current can be arbitrarily referred to I1Calculation formula, at this time B2Is zero, B1Is the maximum value of the charging current; r becomes the secondary coil and the line internal resistance; the inductance L becomes the secondary inductance L2(ii) a C is an artificial line capacitor, namely a capacitor in narrow pulse or wide pulse; the charging current waveform is modeled as follows:
Figure BDA0002669199110000124
Figure BDA0002669199110000125
Figure BDA0002669199110000126
Figure BDA0002669199110000127
Figure BDA0002669199110000128
wherein, I2For charging current, t2For charging time, L2The secondary inductor is C, and the C is a capacitor in narrow pulse or wide pulse;
s22: modeling the artificial line charging voltage of the pulse modulator;
LC resonance charging and discharging can be applied to the expression of voltages at two ends of the artificial line, and the relation of voltage change at two ends of the capacitor is as follows:
Figure BDA0002669199110000131
wherein U (t) is artificial line voltage; u (0) is the initial voltage of the artificial line; cNThe artificial line capacitor is provided, and the size of the artificial line capacitor is related to the width pulse; t is t2Is the charging time; i is2Is a charging current; assuming that at the time of charging, the artificial line initial voltage is 0, we can obtain:
Figure BDA0002669199110000132
finally, obtaining an artificial line charging voltage model:
Figure BDA0002669199110000133
s23: modeling the inverse peak current of the pulse modulator;
in general, the inverse peak step voltage amplitude expression is:
Figure BDA0002669199110000134
wherein R islIs a load impedance, RfIs the inverse peak resistance, RlRulerfThe subscripts l and f of (1) are only used as subscripts to distinguish different impedances, and rho is the impedance of the artificial wire; u shapeNFor artificial line voltage, N is just UNSubscripts have no practical meaning; therefore, when the peak current and the peak voltage are ideally matched, the peak current model can be obtained:
Figure BDA0002669199110000135
wherein tau is time, and can be selected during actual simulationDifferent RlThe value, either positive or negative mismatch is selected and the curve is plotted. The slight negative mismatch state, i.e. R, is selected in the normal designlSlightly less than ρ as stable working state, assuming RlThe variation range of k rho and k can be set to [0, 2 ]]And k is 0, which is an ideal range for short circuit and normal operation [0.8, 1.2 ]]In between, given different k values, n-order (≦ 20) voltage waveforms can be continuously plotted;
s24: modeling the pulse modulator output voltage;
during simulation, the modulated pulse voltage output consists of the leading edge of the output pulse, the pulse voltage and the trailing edge of the pulse. Pulse front duration 0.4 μ s, built as cosine wave (time from 10% amplitude to 90% of maximum):
Figure BDA0002669199110000141
wherein, UriseThe voltage of the modulation pulse in the rising edge time is U, and the voltage of the modulation pulse is U; t is triseIs the rising edge time;
during the pulse width time, the output voltage of the modulator is the primary voltage of the pulse transformer. The modulator output voltage model during a pulse according to the relationship is:
Figure BDA0002669199110000142
wherein, KuIs the reflection coefficient; u shapeNIs the artificial line voltage.
Pulse trailing edge duration was 0.8 μ s, established as a cosine wave (time from 10% amplitude to 90% of maximum):
Figure BDA0002669199110000143
in the formula of UdownFor modulating the voltage of the pulse during the falling edge time, tdownIs the falling edge time;
s25: modeling a pulse modulator power supply module according to power supply conditions required by different weather radar pulse modulators;
the method comprises the following steps of modeling according to power supply conditions required by different weather radar pulse modulators, and if the power supply conditions do not meet requirements, the pulse modulators cannot work normally.
S26: modeling a pulse modulator trigger signal;
the method comprises the following steps of modeling a trigger signal of a pulse modulator, if no charging trigger signal exists, the modulator cannot be charged and discharged, and the modulator outputs a charging fault; if the discharging trigger signal does not exist, the modulator cannot perform the discharging process, and the modulator outputs the discharging fault.
S27: modeling the overvoltage fault of the artificial line voltage of the pulse modulator;
the method comprises the steps of modeling the overvoltage fault of the artificial line voltage of the pulse modulator, and if the charging voltage of the artificial line exceeds the external parameter artificial line voltage threshold value of the simulation component, modulating the overvoltage fault of the artificial line voltage and outputting the overvoltage fault of the artificial line voltage.
S28: modeling an inverse peak overcurrent fault of the pulse modulator;
if the peak-reversal current exceeds the external parameter peak-reversal current threshold value of the simulation component, the modulation outputs the peak-reversal current overcurrent fault;
s29: and modeling the time sequence relation among various waveforms of the pulse modulator.
The time sequence relation among all waveforms of the pulse modulator is controlled by an input trigger signal, each input and output should be in a signal stream form, that is, input and output data are output in a time-related data stream and have a certain time sequence relation, and the embodiment models the time sequence relation of all waveforms obtained by the modulator; the specific model can refer to the specific embodiment of the waveform timing unit 29 in embodiment 1 and fig. 2.
Preferably, the method of step S2 is further implemented in this implementation, step S2 mainly implements the logical relationship between each input and output in step S1, and each output generates a corresponding pulse modulator key point waveform and a fault determination output according to the logical relationship of the inputs, and step S2 implements the generation of the modulator key point waveform through a modeling formula in the technical solution. The general weather radar pulse modulator provides parameters such as the transformation ratio of a charging transformer of the modulator, artificial line capacitance during wide and narrow pulse, primary and secondary inductances of the charging transformer and the like in factory parameters, and based on the parameters, a waveform generated in the charging and discharging process of the pulse modulator can be generated according to the step in S2;
firstly, detecting whether a modulator power supply is normal or not, if so, starting the modulator to work, and carrying out the following steps; otherwise, the modulator does not work; then detecting whether the pulse width selection signal (PulseWidSel) is in a narrow pulse mode or a wide pulse mode; then detecting whether a charging trigger signal (ChargeTri) arrives, if so, starting a charging process by the modulator to generate a corresponding waveform; otherwise, the modulator does not perform the charging process operation, and triggers a fault (SCRTRIFLT) output interface to output a fault; further detecting whether the artificial line charging voltage (PEN waveform) exceeds an artificial line voltage threshold PENNVTH, if so, outputting an artificial line overvoltage fault by the modulator, and enabling the modulator not to work; further detecting whether the peak-reversal current exceeds a threshold INVCRUTH, if so, outputting a peak-reversal overcurrent fault by the modulator, and the modulator does not work; finally, whether a discharge trigger signal (PresetPulse) arrives or not is detected, if so, the artificial line voltage starts to discharge, and MODHVOut outputs modulation pulse high voltage; otherwise, the manual line voltage discharge operation is not carried out, no modulation pulse high-voltage output is carried out, and a fault (SCRTRIFLT) output interface is triggered to output a fault; fig. 6 to 12 are different waveforms obtained in the narrow pulse; in fig. 11, (a) is the energization current, (b) is the artificial line charging current, (c) is the artificial line voltage, and (d) is the modulated pulse high voltage output, it can be observed that the pulse modulator simulation model fully satisfies the timing requirements of the flyback charging process, in accordance with fig. 11, and with reference to the timing diagram of fig. 2.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A simulation method of a weather radar pulse modulator is characterized by comprising the following steps:
s1: modeling the appearance interface design of a simulation component of a weather radar pulse modulator;
s2: simulating a functional algorithm of a weather radar pulse modulator;
wherein, step S1 specifically includes:
s11: designing an external interface of a pulse modulator simulation component according to actual input and output interfaces of weather radar pulse modulators of different models;
s12: configuring parameters of the pulse modulator simulation component;
s13: designing the package of the pulse modulator simulation component by using the outline package diagram;
step S2 specifically includes:
s20: modeling a pulse modulator energization current;
s21: modeling a pulse modulator charging current;
s22: modeling the artificial line charging voltage of the pulse modulator;
s23: modeling the inverse peak current of the pulse modulator;
s24: modeling the pulse modulator output voltage;
s25: modeling a pulse modulator power supply module according to power supply conditions required by different weather radar pulse modulators;
s26: modeling a pulse modulator trigger signal;
s27: modeling the overvoltage fault of the artificial line voltage of the pulse modulator;
s28, modeling the pulse modulator peak inversion overcurrent fault;
s29: and modeling the time sequence relation among various waveforms of the pulse modulator.
2. The method of claim 1, wherein the pulse modulator emulation component external interface outputs via a time-dependent data stream.
3. The method of claim 1, wherein the energizing current in step S21 is varied according to the following equation:
Figure FDA0002669199100000011
wherein I is an energizing current, V0Is power supply voltage, t is energizing time, L1Is the primary inductance value.
4. The method of claim 3, wherein the charging current in step S22 is modeled as follows:
Figure FDA0002669199100000021
wherein, I2For charging current, t2For charging time, ωdFor complex frequency of the circuit, alpha being the natural frequency of the energized current circuit, B1A charge initiation current that is a narrow pulse.
5. The method according to claim 4, wherein the artificial line charging voltage in step S23 is modeled as follows:
Figure FDA0002669199100000022
wherein, CNIs an artificial line capacitor.
6. The method of claim 5, wherein the inverse peak current in step S24 is modeled as follows:
Figure FDA0002669199100000023
wherein ifn(τ) is the inverse peak current, Ufn(τ) is the inverse peak step voltage amplitude, RfIs inverse peak resistance, UNIs artificial line voltage, Rlρ is the artificial line impedance, n is the order, and τ is the time.
7. The method of claim 5, wherein the output voltage in step S25 is modeled as follows:
Figure FDA0002669199100000024
wherein, KuIs a reflection coefficient, UNIs the artificial line voltage.
8. A simulation system for a weather radar pulse modulator, comprising: the external interface module is used for designing the appearance interface of the simulation component of the modulator, and the functional algorithm module is used for designing the generation of the waveform of the key point of the modulator and the generated conditions;
wherein the external interface module includes:
the external interface unit is used for designing an external interface of the pulse modulator simulation component according to actual input and output interfaces of weather radar pulse modulators of different models;
the component parameter unit is connected with the external interface unit and is used for configuring parameters of the pulse modulator simulation component;
the packaging unit is connected with the external interface unit and the component parameter unit and used for designing the packaging of the pulse modulator simulation component by using the appearance packaging diagram;
the storage unit is connected with the packaging unit and used for storing the pulse modulator simulation components after being packaged;
the functional algorithm module is connected with the storage unit and comprises:
an energization current unit for modeling a pulse modulator energization current;
the charging current unit is connected with the enabling current unit and used for modeling the charging current of the pulse modulator;
the artificial line charging voltage unit is connected with the charging current unit and used for modeling the artificial line charging voltage of the pulse modulator;
the inverse peak current unit is connected with the artificial line charging voltage unit and used for modeling inverse peak current of the pulse modulator;
the output voltage unit is connected with the artificial line charging voltage unit and used for modeling the output voltage of the pulse modulator;
the power module unit is used for modeling the pulse modulator power module according to power conditions required by different weather radar pulse modulators;
the trigger signal unit is connected with the charging current unit and the output voltage unit and used for modeling a pulse modulator trigger signal;
the voltage overvoltage fault unit is connected with the artificial line charging voltage unit and used for modeling the artificial line voltage overvoltage fault of the pulse modulator, and outputting the artificial line voltage overvoltage fault if the artificial line charging voltage exceeds an external parameter artificial line voltage threshold value of the simulation component;
the peak-reversal overcurrent fault unit is connected with the peak-reversal current unit and used for modeling peak-reversal overcurrent faults of the pulse modulator, and outputting peak-reversal current overcurrent faults when the peak-reversal current exceeds an external parameter peak-reversal current threshold value of the simulation component;
and the waveform time sequence unit is used for modeling the time sequence relation among all waveforms of the pulse modulator.
9. The system of claim 8, wherein the pulse modulator emulation component in the external interface unit external interface outputs via a time-dependent data stream.
10. The system of claim 8, wherein the model of the energizing current in the energizing current is:
Figure FDA0002669199100000031
wherein I is an energizing current, V0Is power supply voltage, t is energizing time, L1Is the primary inductance value.
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