CN108988932A - Digital tracking receiver emulation platform based on MATLAB - Google Patents
Digital tracking receiver emulation platform based on MATLAB Download PDFInfo
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- CN108988932A CN108988932A CN201810748048.9A CN201810748048A CN108988932A CN 108988932 A CN108988932 A CN 108988932A CN 201810748048 A CN201810748048 A CN 201810748048A CN 108988932 A CN108988932 A CN 108988932A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
Ship satellite communication field, during solution ship satellite communication earth station, receiver phase can not be in the case where tracking satellite, the failure of receiver can not be positioned and be solved the problems, such as in time, the present invention provides the digital tracking receiver emulation platforms based on MATLAB, the digital tracking receiver emulation platform based on MATLAB includes square-wave frequency modulation unit 1, phase shift unit 2, converter unit 3 and demodulation output unit 4, the signal output end of the square-wave frequency modulation unit 1 is connect with the signal input part of phase shift unit 2, the signal output end of the phase shift unit 2 is connect with the signal input part of converter unit 3, the signal output end of the converter unit 3 is connected with the input terminal of demodulation output unit 4；The problem of receiver can quickly be analyzed in the process of running by simulation scenarios, realizes the functions such as receiver test, malfunction elimination, theoretical research and parameter adjustment, improves work efficiency.
Description
Technical field
The present invention relates to the technical fields of space flight boat-carrying satellite communication, are in particular the figure trackings based on MATLAB
Receiver emulation technology.
Background technique
For boat-carrying satellite communication earth station, with the navigation of ship, earth station need to position ship with
Track, but some problems are certainly existed during tracking, accuracy, the tracking failure and communication failure etc. of tracking are all the fields
The huge problem faced, even if tracking receives location information during tracking, but the location information also certainly exists deviation, because
This is proposed higher standard and requirement to the building block in communication process in ship satellite communication earth station how
The accuracy of communication component is corrected, timely malfunction elimination, theoretical research and parameter adjustment all have very big choose
War.
During solving ship satellite communication earth station, the variation of the polarized polarizing angle of tracker wire leads to the phase of receiver
Position drift so that former receiver phase can not tracking satellite the problem of, the present invention provides the number based on MATLAB with
Track receiver emulation platform realizes receiver examination by emulating the problem of can quickly analyzing receiver in the process of running
Test, malfunction elimination, theoretical research and parameter adjustment etc. functions, improve work efficiency.
Summary of the invention
During solving ship satellite communication earth station, receiver phase can not be in the case where tracking satellite, for connecing
The failure of receipts machine can not be positioned and be solved the problems, such as in time, and the present invention provides the digital tracking receiver emulation based on MATLAB
Platform, being somebody's turn to do the digital tracking receiver emulation platform based on MATLAB includes square-wave frequency modulation unit 1, phase shift unit 2, frequency conversion
Unit 3 and demodulation output unit 4, the signal output end of the square-wave frequency modulation unit 1 and the signal of phase shift unit 2 input
End connection, the signal output end of the phase shift unit 2 are connect with the signal input part of converter unit 3, the frequency conversion
The signal output end of unit 3 is connected with the input terminal of demodulation output unit 4；Receiver can be received not by the emulation platform
The case where same waveform, is emulated, so that the malfunction elimination for receiver provides theoretical foundation, the utility model solves ship
During satellite communication earth station, the variation of the polarized polarizing angle of tracker wire leads to the phase drift of receiver, causes former reception
Machine phase can not tracking satellite the problem of, which can pass through setting receiver parameters and carry out operating analysis, final real
Now to the fault location of receiver in investigation.
To solve the problems, such as that emulation platform demodulates error voltage during ship satellite communication earth station, the present invention is based on
The digital tracking receiver emulation platform of MATLAB, the demodulation output unit 4 use phaselocked loop skill, the phaselocked loop packet
It includes phase discriminator, loop filter and voltage-controlled oscillator；The method achieve the demodulation to error voltage, and obtain preferable
Effect.
For the practicability for enhancing the digital tracking receiver emulation platform based on MATLAB, the present invention is based on the numbers of MATLAB
Word track receiver emulation platform, the digital tracking receiver emulation platform based on MATLAB further include shielding box 8, electricity
Source 7, crystal oscillator unit 5 and monitoring unit 6, by converter unit 3, demodulation output unit 4, shielding box 8, power supply 7,5 and of crystal oscillator unit
Monitoring unit 6 forms track receiver；The signal output end of the crystal oscillator unit 5 and the signal input part of converter unit 3 connect
It connects, the signal input part of converter unit 3 is connect with the signal output end of phase shift unit 2, the signal output end of converter unit 3
It is connect with the signal input part of demodulation output unit 4, the signal of the signal output end and demodulation output unit 4 of converter unit 3 is defeated
Enter end to connect, converter unit 3 and 6 two-way communication of monitoring unit, monitoring unit 6 and demodulation 4 two-way communication of output unit, power supply 7
Power output end is connect with the power input of monitoring unit 6；The demodulation output unit 4 further includes an input signal I
(t) and an output signal O (t)；The monitoring unit 6 also has an input/output signal I/O (t)；The program is formed
Track receiver can be used for the satellite of locating and tracking ship satellite communication earth station.
For feasibility, practicability and the promotion problem-solving ability for promoting the emulation platform, the present invention is based on MATLAB
Digital tracking receiver emulation platform, there are two the described track receiver settings, respectively track receiver I 11 and with
Track receiver II 12 is additionally provided with CAN analyzer 9, radio-frequency front-end 13, differential mode feedback 14 and servo-system 10；The radio frequency
It is low that front end 13 is provided with power splitter I 13-1, power splitter II 13-2, sum-difference network I 13-3, sum-difference network II 13-4 and four
Noise amplifier (LNA), the tracking system realize the tracking to ship satellite using receiver.
Detailed description of the invention
The present invention will be further described in detail with specific implementation method with reference to the accompanying drawing.
Fig. 1 is the composition frame diagram of the digital tracking receiver emulation platform of the invention based on MATLAB；
Fig. 2 is that the whole MATLAB of the digital tracking receiver emulation platform of the invention based on MATLAB emulates composition
Figure；
Fig. 3 is the MATLAB of the square-wave frequency modulation unit of the digital tracking receiver emulation platform of the invention based on MATLAB
Emulation composition figure；
Fig. 4 is the MATLAB of the phase shift unit of the digital tracking receiver emulation platform of the invention based on MATLAB
The composition figure of emulation platform；
Fig. 5 is the MATLAB emulation of the converter unit of the digital tracking receiver emulation platform of the invention based on MATLAB
Composition figure；
Fig. 6 is the MATLAB of the demodulation output unit of the digital tracking receiver emulation platform of the invention based on MATLAB
Emulation composition figure；
Fig. 7 is the composition block diagram of the receiver of the digital tracking receiver emulation platform of the invention based on MATLAB；
Fig. 8 is the composition block diagram of the tracking system of the digital tracking receiver emulation platform of the invention based on MATLAB；
Fig. 9 is the digital tracking receiver emulation platform of the invention based on MATLAB in antenna lock-in line polarization satellite mistake
Error voltage line chart in the case that receiver phase deviation is big in journey；
Figure 10 is the digital tracking receiver emulation platform of the invention based on MATLAB in antenna lock-in line polarization satellite
Error voltage scatter plot in the case that receiver phase deviation is big in the process；
Figure 11 is the digital tracking receiver emulation platform of the invention based on MATLAB in antenna lock-in line polarization satellite
Error voltage line chart in the case that receiver phase deviation is small in the process；
Figure 12 is the digital tracking receiver emulation platform of the invention based on MATLAB in antenna lock-in line polarization satellite
Error voltage scatter plot in the case that receiver phase deviation is small in the process；
Figure 13 is the digital tracking receiver emulation platform of the invention based on MATLAB in antenna lock-in line polarization satellite
The error voltage line chart of certain test in the process；
Figure 14 is the digital tracking receiver emulation platform of the invention based on MATLAB in antenna lock-in line polarization satellite
The error voltage scatter plot of certain test in the process；
Figure 15 is the digital tracking receiver emulation platform of the invention based on MATLAB in antenna lock-in line polarization satellite
In the process certain test it is adjusted after error voltage line chart；
Figure 16 is the digital tracking receiver emulation platform of the invention based on MATLAB in antenna lock-in line polarization satellite
In the process certain test it is adjusted after error voltage scatter plot.
In figure: square-wave frequency modulation unit 1；Phase shift unit 2；Converter unit 3；Demodulate output unit 4；Crystal oscillator unit 5；Prison
Control unit 6；Power supply 7；Shielding box 8；CAN analyzer 9；Servo-system 10；Track receiver I 11；Track receiver II 12；It penetrates
Frequency front end 13；Power splitter I 13-1；Power splitter II 13-2；Sum-difference network I 13-3；Sum-difference network II 13-4；Differential mode feedback
14。
Specific embodiment
Specific embodiment one illustrates present embodiment below with reference to Fig. 1-16, to solve in ship geo satellite communication
During standing, the variation of the polarized theoretical polarizing angle of tracker wire leads to the phase drift of receiver, so as to cause former receiver phase
Position can not tracking satellite the problem of, during tracking, tracking linear polarization star theoretical polarizing angle can change, and then cause
Receiver phase drift, antenna tracking degradation, when polarizing angle variation is excessive, former receiver phase will be unable to tracking and defend
Star, and the variation of external environment especially can also cause the drift of phase with the change of poor low-noise amplifier temperature and humidity；This
When, receiver phase setting is improper, and antenna will be unable to normal tracking satellite, and error voltage mistake occurred in digital tracking receiver
Greatly, phaselocked loop mistake lock, can not locking signal, display screen crash, demodulate terminal version failure the problems such as, therefore, construct a number
Track receiver emulation platform is meaningful, on the one hand can analyze the problem of encountering in investigation receiver operation, on the other hand
Post personnel theory research quality can be improved and be in charge of capacity of equipment；
During solving ship satellite communication earth station, receiver phase can not be in the case where tracking satellite, for connecing
The failure of receipts machine can not be positioned and be solved the problems, such as in time, and the present invention provides the digital tracking receiver emulation based on MATLAB
Platform, being somebody's turn to do the digital tracking receiver emulation platform based on MATLAB includes square-wave frequency modulation unit 1, phase shift unit 2, frequency conversion
Unit 3 and demodulation output unit 4, the signal output end of the square-wave frequency modulation unit 1 and the signal of phase shift unit 2 input
End connection, the signal output end of the phase shift unit 2 are connect with the signal input part of converter unit 3, the frequency conversion
The signal output end of unit 3 is connected with the input terminal of demodulation output unit 4；
The square-wave frequency modulation unit 1 of the digital tracking receiver emulation platform based on MATLAB is by input signal unit, increasing
Gain module, the Gain module that gain is -1, sine wave transmitting unit and the either-or switch that benefit is 1 are constituted, input signal list
The signal input part for the Gain module that the Gain module and gain that the signal output end of member is respectively 1 with gain are -1 is connect, and is increased
Benefit for the effect of 1 Gain module be so that input signal is constant and 0 degree of phase phase difference, gain for -1 Gain module effect
To make input signal carry out the change of 180 degree, therefore input signal is divided into the two-way that 0 degree and 180 degree are differed with input phase
The signal output end for the Gain module that signal, Gain module that gain is 1 and gain are -1 two with either-or switch respectively
The input terminal of switch connects, and the signal input part of sine wave transmitting unit and either-or switch connects, and sine wave transmitting unit is used
In the on-off of the different routes of regular control either-or switch, by the connection of either-or switch difference route so that two choosings
One switch selects 0 degree to be equivalent to and multiplies 1, select 180 degree to be equivalent to and multiply -1, finally close to select 0 degree of input signal unit or 180 degree
At output waveform be square wave, in the MATLAB emulation platform of square-wave frequency modulation unit 1 to build composition as shown in Figure 3；
The phase shift unit 2 of the digital tracking receiver emulation platform based on MATLAB, phase are description signal ripples
The measurement of deformation, usually using degree (angle) as unit, also referred to as phase angle, for a wave, at the time of it indicates specific
It recycle in position: it is a kind of it whether wave crest, trough or certain point between them scale, when electromagnetic wave passes in the medium
It broadcasts, phase can shift, and build composition as shown in figure 4, phase shift in the MATLAB emulation platform of phase shift unit 2
Moving cell 2 exports the sine wave signal of input after 45 degree of phase shift；
The converter unit 3 of the digital tracking receiver emulation platform based on MATLAB, ship satellite communication earth station mistake
Journey, electromagnetic wave are changed frequency during spatial, and in receivers, the radiofrequency signal of 3625~4200MHz passes through
Become the intermediate-freuqncy signal of 70MHz after being mixed twice, due to the limitation of microcomputer dominant frequency, MATLAB do not support 3625~
4200MHz is converted to the emulation of 70MHz, therefore this process can only simplify processing, in the MATLAB emulation platform of converter unit 3
Composition is built as shown in figure 5, carrying out functional test to it, its frequency is increased 100 times by converter unit 3, is obtained by becoming
After frequency unit 3, the frequency of waveform changes, and frequency-variable module function can be realized normally；
The demodulation output unit 4 of the digital tracking receiver emulation platform based on MATLAB, ship geo satellite communication
During standing, receiver is used to receive the location information of distribution satellite, and the signal that receiver receives in receive process is inevitable
There is a certain error for meeting, it is therefore desirable to demodulate to error voltage, therefore receiver is carrying out error voltage demodulating process
In, PHASE-LOCKED LOOP PLL TECHNIQUE is used, phaselocked loop is the phase control system of a closed loop, Phase Tracking is able to carry out, so that output
The variation module of the phase of input signal in the Phase Tracking of signal；Phaselocked loop is by phase discriminator, loop filter and voltage control
Three basic element of character compositions of oscillator, phase discriminator is a phase comparison device, and sinusoidal phase discriminator can use multiplier and low pass filtered
The series connection of wave device realized, demodulate in the MATLAB emulation platform of output unit 4 building composition as shown in fig. 6,
And it is as follows to carry out functional test: input signal Ui(t) with feedback signal Uo(t) output after multiplier isContaining high fdrequency component, pass through
After the low-pass filtering of loop filter, high fdrequency component 0.5kmUiUosin(2ω0t+φ1+φ2) be filtered out, only remaining direct current divides
Amount realizes the function of phase discriminator simulation results show high fdrequency component is filtered out by filter；
The case where different wave can be received to receiver by the emulation platform, emulates, to be the event of receiver
Barrier investigation provides theoretical foundation, during the utility model solves ship satellite communication earth station, the polarized polarization of tracker wire
The variation at angle leads to the phase drift of receiver, cause former receiver phase can not tracking satellite the problem of, which can
It is final to realize the fault location to receiver in investigation to carry out operating analysis by setting receiver parameters.
Specific embodiment two illustrates present embodiment below with reference to Fig. 1-16, to solve ship satellite communication earth station
The problem of emulation platform demodulates error voltage in the process, the present invention is based on the digital tracking receiver emulation platform of MATLAB,
The demodulation output unit 4 uses phaselocked loop skill, and the phaselocked loop includes controlling phase discriminator, loop filter and voltage
Oscillator；
Phaselocked loop is the phase control system of a closed loop, is able to carry out Phase Tracking so that the phase of output signal with
The variation module of the phase of input signal on track；Phaselocked loop is by phase discriminator, three bases of loop filter and voltage-controlled oscillator
This component composition, phase discriminator is a phase comparison device, sinusoidal phase discriminator can with multiplier and low-pass filter connect into
Row is realized, is demodulated in the MATLAB emulation platform of output unit 4 and is built composition as shown in fig. 6, and carrying out function survey
It tries as follows: input signal Ui(t) with feedback signal Uo(t) output after multiplier isContaining high fdrequency component, pass through
After the low-pass filtering of loop filter, high fdrequency component 0.5kmUiUosin(2ω0t+φ1+φ2) be filtered out, only remaining direct current divides
Amount realizes the function of phase discriminator simulation results show high fdrequency component is filtered out by filter；
The method achieve the demodulation to error voltage, and obtain preferable effect.
Specific embodiment three illustrates present embodiment below with reference to Fig. 1-16, be enhancing based on MATLAB number with
The practicability of track receiver emulation platform, the present invention is based on the digital tracking receiver emulation platform of MATLAB, it is described based on
The digital tracking receiver emulation platform of MATLAB further includes shielding box 8, power supply 7, crystal oscillator unit 5 and monitoring unit 6, by frequency conversion
Unit 3, demodulation output unit 4, shielding box 8, power supply 7, crystal oscillator unit 5 and monitoring unit 6 form track receiver, system block diagram
As shown in Figure 7；The signal output end of the crystal oscillator unit 5 is connect with the signal input part of converter unit 3, converter unit 3
Signal input part is connect with the signal output end of phase shift unit 2, the signal output end and demodulation output unit of converter unit 3
4 signal input part connection, the signal output end of converter unit 3 and the signal input part of demodulation output unit 4 connect, converter unit
3 with 6 two-way communication of monitoring unit, monitoring unit 6 and demodulation 4 two-way communication of output unit, the power output end of power supply 7 and monitoring
The power input of unit 6 connects；The demodulation output unit 4 further includes an input signal I (t) and an output signal
O(t)；The monitoring unit 6 also has an input/output signal I/O (t)；The program, which forms track receiver, can be used for
The satellite of locating and tracking ship satellite communication earth station；
The realization of receiver improves the practicability of emulation platform.
Specific embodiment four illustrates present embodiment below with reference to Fig. 1-16, for promoted the emulation platform feasibility,
Practicability and promoted problem-solving ability, the present invention is based on the digital tracking receiver emulation platform of MATLAB, it is described with
Track receiver setting there are two, respectively track receiver I 11 and track receiver II 12, be additionally provided with CAN analyzer 9,
Radio-frequency front-end 13, differential mode feedback 14 and servo-system 10, block diagram is as shown in Figure 8；The radio-frequency front-end 13 is provided with power splitter I
13-1, power splitter II 13-2, sum-difference network I 13-3, sum-difference network II 13-4 and four low-noise amplifiers (LNA), should be with
Using receiver realization to the tracking of ship satellite, the transmission of receiver state signal, parameter setting signal, tracking connects track system
The tracking signal of receipts machine I 11 and track receiver II 12 includes locking signal, pre- lock signal, beacon level signal, beacon letter
It makes an uproar than signal, azimuth error signal, pitch error signal, these information are transferred to servo-system 10 by CAN analyzer 9, by
Servo-system 10 according to locking signal and working condition selection track receiver I 11 and track receiver II 12 in one into
Line trace, CAN analyzer 9 are linked with the track receiver chosen, one end of CAN analyzer 9 and the port for choosing receiver
Connection, the other end connect with the USB port of debugging microcomputer, install respective drive, set the CAN bus rate of CAN analyzer 9
Etc. after parameters, debugging software can receive the state of receiver, the parameter of receiver can will be chosen to believe by CAN analyzer 9
Breath reads debugging microcomputer, parameter information include beacon frequency, level, signal-to-noise ratio, pitch error voltage, side be error voltage,
Locking signal, phaselocked loop state, a local oscillator, two local oscillators etc. will import the imitative of MATLAB construction after the parsing of above-mentioned parameter data
In true platform, and model parameter is accordingly arranged, is emulated, the Simulation Interface median surface upper left corner shows that parameter current is set
It sets, the lower left corner can carry out parameter setting, and the right box shows simulation result, and the lower right corner is " to open mould respectively there are three button
Type ", " parameter reading " and " starting to emulate ", after clicking " opening model ", the receiver module put up will be opened, and parameter is set
It is set to default value, after clicking " parameter reading ", receiver parameters choose receiver for be set as reading to come from CAN analyzer 9
Parameter, click " starting to emulate " after, model will emulate, and as a result show in the right box at interface；
And carried out following emulation, for boat-carrying satellite communication earth station, when ship on ocean when driving, ground
Changes of reason position can cause the variation of external environment, and the change of difference low-noise amplifier temperature and humidity can cause the drift of phase
It moves, at this point, receiver phase setting is improper, antenna will be unable to normally track linear polarization satellite, in the following, being built using the present invention
Model research receiver phase variation and the variation tendency of error voltage；
When receiver phase is bigger than normal, during antenna lock-in line polarizes satellite, the error voltage in orientation and pitching
Line chart is as shown in Figure 9, scatter plot is as shown in Figure 10, when receiver phase is less than normal, in the mistake of antenna lock-in line polarization satellite
The error voltage line chart of Cheng Zhong, orientation and pitching is as shown in figure 11, scatter plot is as shown in figure 12, can be with from model emulation result
Summarize the relationship between receiver phase variation and error voltage: during antenna lock-in line polarizes satellite, if error
Voltage enters clockwise around origin, then receiver phase is bigger than normal；If error voltage enters counterclockwise around origin, receiver
Phase is less than normal；When receiver phase error is more than 40 °, antenna will be counterclockwise around origin or rotates clockwise oscillation or hair
It dissipates, it can not normal locking satellite；
When certain boat-carrying satellite communication earth station arrives at predetermined maritime area, 115.5 ° of E of antenna tracking linear polarization through excessive Japan Airline's row
The orientation and error voltage line chart of pitching is as shown in figure 13, scatter plot is as shown in figure 14 during star, can from figure
Out, it is that error voltage enters clockwise around origin that oscillatory condition clockwise, which is presented, in error voltage, and receiver phase is bigger than normal, and former
Phase has been unable to normal use；It may determine that about 40 ° bigger than normal of phase or so at this time according to rule summarized above, by orientation, bow
It faces upward phase and is revised as 130 °, -140 ° from 170 °, -100 °, after modification, use David's 115.5 ° of E stars of logical tracking, error voltage
Line chart is as shown in figure 15, scatter plot is as shown in figure 16, it can be seen from the figure that two shaft error voltages are restrained rapidly, fluctuation compared with
It is small, and antenna locking process there is a situation where error voltage around origin rotate, thus judge that phase adjusted is
Suitably；
Therefore the functions such as receiver test, malfunction elimination, theoretical research and parameter adjustment may be implemented in the present invention；The present invention
Emulation platform can quickly analyze receiver there are the problem of, and mentioned by emulation it can be concluded that how this modifies
High working efficiency.
Specific embodiment five illustrates present embodiment below with reference to Fig. 1-16, fixed to solve receiver failure problems difficulty
To the research of mechanism opinion is received, the method for the emulation platform is that the present invention is based on the figure trackings of MATLAB to connect for the problem of position, enhancing
Receipts machine emulation mode, the digital tracking receiver emulation mode based on MATLAB be,
Step 1: it is provided with sum-difference network before square-wave frequency modulation unit 1 using when the platform, it will be sum-difference network and poor
Signal inputs square-wave frequency modulation unit 1 respectively；
Step 2: through the modulated difference signal of the square wave C (t) of square wave modulation unit 1 with and signal be combined into all the way after by
Phase shift unit 2, converter unit 3 and demodulation output unit output 4, have output type；
Step 3: believing by 2 phase shift of phase shift unit with pitch axis if the output of square-wave frequency modulation unit 1 and difference signal
Number with orientation axis signal two outputs, demodulated output unit 4 exports pitch error signal and azimuth error signal after demodulating；
The present invention can carry out the emulation of receiver parameters, by emulating available suitable parameter value, and to reception
Machine is configured, and makes it possible to correctly track satellite, is improved post personnel theory research quality and is in charge of capacity of equipment.
Specific embodiment six illustrates present embodiment below with reference to Fig. 1-16, for the emulation for solving receiver parameters, leads to
Cross MATLAB and emulate available suitable parameter value, and receiver is configured, make it possible to carry out satellite correctly with
Track is advanced optimized as of the invention, described and poor the present invention is based on the digital tracking receiver emulation mode of MATLAB
Signal is respectively E∑=b cos ω τ,Wherein EΣFor and signal, EΔFor difference signal, b be and
Signal amplitude, μ are normalization error, and τ is the time, and ω is the received beacon signal frequency of feed, and θ is that antenna deviates Satellite Angle
Degree,For the offset direction of antenna, γ is and poor two-way phase difference；By principle of simulation based on this model, so as to reception
Machine can carry out model emulation, and then failure the problem of judge receiver, and simulate the suitable parameter value of receiver
For being tracked to satellite.
Specific embodiment seven illustrates present embodiment below with reference to Fig. 1-16, for the emulation for solving receiver parameters, leads to
Cross MATLAB and emulate available suitable parameter value, and receiver is configured, make it possible to carry out satellite correctly with
Track is advanced optimized as of the invention, and the present invention is based on the digital tracking receiver emulation mode of MATLAB, the outputs
Formula isWherein k is the voltage gain of transmission channel, ω1For warp
After crossing channel down coversion and signal angular frequency；By principle of simulation based on this model, allows and mould is carried out to receiver
Type emulation, and then failure the problem of judge receiver, and simulate receiver suitable parameter value be used to satellite into
Line trace.
Specific embodiment eight illustrates present embodiment below with reference to Fig. 1-16, for the emulation for solving receiver parameters, leads to
Cross MATLAB and emulate available suitable parameter value, and receiver is configured, make it possible to carry out satellite correctly with
Track is advanced optimized as of the invention, and the present invention is based on the digital tracking receiver emulation mode of MATLAB, the square waves
The reference frequency of the output of modulation unit 1 and difference signal is u (t)=cos ω1τ；By principle of simulation based on this model, so that
The problem of model emulation can be carried out to receiver, and then judge receiver failure, and simulate the suitable of receiver
Parameter value is used to track satellite.
Specific embodiment nine illustrates present embodiment below with reference to Fig. 1-16, for the emulation for solving receiver parameters, leads to
Cross MATLAB and emulate available suitable parameter value, and receiver is configured, make it possible to carry out satellite correctly with
Track is advanced optimized as of the invention, and the present invention is based on the digital tracking receiver emulation mode of MATLAB, the phases
Orientation axis signal after 2 phase shift of mobile unit is u1(t)=cos (ω1τ+θ1), θ1It is defended for the deviation of phase shift unit aft antenna
Star angle, pitching axis signal and orientation axis signal are similarly；By principle of simulation based on this model, allow to receiver into
Row model emulation, and then failure the problem of judge receiver, and simulate the suitable parameter value of receiver and be used to defending
Star is tracked.
Specific embodiment ten illustrates present embodiment below with reference to Fig. 1-16, for the emulation for solving receiver parameters, leads to
Cross MATLAB and emulate available suitable parameter value, and receiver is configured, make it possible to carry out satellite correctly with
Track is advanced optimized as of the invention, and the present invention is based on the digital tracking receiver emulation mode of MATLAB, the pitching
Error signal and azimuth error signal are respectively as follows:
The digital tracking receiver emulation mode course of work based on MATLAB, Step 1: flat using this
It is provided with sum-difference network before square-wave frequency modulation unit 1 when platform, if being respectively E with difference signalΣ=b cos ω τ,Wherein E∑For and signal, EΔFor difference signal, b is and signal amplitude, μ are normalization error, τ
For the time, ω is the received beacon signal frequency of feed, and θ is that antenna deviates satellite angle,For the offset direction of antenna, γ is
With poor two-way phase difference；
Step 2: through the modulated difference signal of square wave C (t) with and signal be combined into all the way after by phase shift unit 2, change
Frequency unit 3 and demodulation output unit 4 have output type:Wherein k
For the voltage gain of transmission channel, ω1For after the down coversion of channel and signal angular frequency；
Step 3: reference source output frequency are as follows: u (t)=cos ω1τ；Orientation after 2 phase shift of phase shift unit
Axis and pitching axis signal respectively can are as follows: u1(t)=cos (ω1τ+θ1), θ1Deviate satellite angle for phase shift unit aft antenna,
Pitching axis signal and orientation axis signal are similarly；Pitch error signal and azimuth error signal after the demodulated demodulation of output unit 4
It is respectively as follows:
Step 4: by the accuracy of theoretical value and emulation being combined to verify emulation platform of the present invention, if taking
Following parametersThe π of b=20, ω=20, γ=20, into emulation platform is then brought above-mentioned parameter value in θ=0.1
, it is concluded that, the receiver error voltage derived from working principle is in the derivation formula of working principleBy the mould of the digital tracking receiver emulation platform based on MATLAB
Shape parameter carries out above-mentioned corresponding setting, show that the working result of emulation platform is consistent with theory deduction；Emulation platform it is worked
Journey is identical as the operation result of emulation platform model in MATLAB, therefore the feasibility of the model of emulation platform and standard in MATLAB
True property is verified；
By principle of simulation based on this model, allow and model emulation is carried out to receiver, and then judges to receive
The problem of machine failure, and simulate receiver suitable parameter value be used to satellite is tracked.
Certainly, above description is not limitation of the present invention, and the present invention is also not limited to the example above, the art
The variations, modifications, additions or substitutions that those of ordinary skill is made within the essential scope of the present invention also belong to guarantor of the invention
Protect range.
Claims (4)
1. the digital tracking receiver emulation platform based on MATLAB, it is characterised in that: be somebody's turn to do the figure tracking based on MATLAB and connect
Receipts machine emulation platform includes square-wave frequency modulation unit (1), phase shift unit (2), converter unit (3) and demodulates output unit (4),
The signal output end of the square-wave frequency modulation unit (1) is connect with the signal input part of phase shift unit (2), the phase
The signal output end of mobile unit (2) is connect with the signal input part of converter unit (3), the signal of the converter unit (3)
Output end is connected with the input terminal of demodulation output unit (4).
2. the digital tracking receiver emulation platform according to claim 1 based on MATLAB, it is characterised in that: described
It demodulates output unit (4) and uses phaselocked loop skill, the phaselocked loop includes by phase discriminator, loop filter and voltage-controlled oscillating
Device.
3. the digital tracking receiver emulation platform according to claim 1 based on MATLAB, it is characterised in that: described
Digital tracking receiver emulation platform based on MATLAB further includes that shielding box (8), power supply (7), crystal oscillator unit (5) and monitoring are single
First (6), by converter unit (3), demodulation output unit (4), shielding box (8), power supply (7), crystal oscillator unit (5) and monitoring unit
(6) track receiver is formed；The signal output end of the crystal oscillator unit (5) is connect with the signal input part of converter unit (3),
The signal input part of converter unit (3) is connect with the signal output end of phase shift unit (2), and the signal of converter unit (3) is defeated
Outlet is connect with the signal input part of demodulation output unit (4), the signal output end and demodulation output unit of converter unit (3)
(4) signal input part connects, converter unit (3) and monitoring unit (6) two-way communication, monitoring unit (6) and demodulation output unit
(4) power output end of two-way communication, power supply (7) is connect with the power input of monitoring unit (6)；The demodulation exports single
First (4) further include an input signal I (t) and an output signal O (t)；The monitoring unit (6) also has an input
Output signal I/O (t).
4. the digital tracking receiver emulation platform according to claim 3 based on MATLAB, it is characterised in that: described
There are two track receiver settings, respectively track receiver I (11) and track receiver II (12), is additionally provided with CAN analysis
Instrument (9), radio-frequency front-end (13), differential mode feedback (14) and servo-system (10)；The radio-frequency front-end (13) is provided with power splitter I
(13-1), power splitter II (13-2), sum-difference network I (13-3), sum-difference network II (13-4) and four low-noise amplifiers
(LNA)。
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Application publication date: 20181211 |