CN115987309A - Noncoherent multipath interference signal simulator and method - Google Patents
Noncoherent multipath interference signal simulator and method Download PDFInfo
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Abstract
The simulator comprises a clock generation module for generating an original reference clock signal, a clock characteristic simulation module for generating N-1 paths of correction clock signals with different clock characteristics, a digital baseband signal generation module for generating corresponding N-1 paths of independently controlled digital baseband signals according to the N-1 paths of correction clock signals, a DAC module for completing digital-to-analog conversion according to the N-1 paths of correction clock signals and the corresponding N-1 paths of independently controlled digital baseband signals and generating corresponding N-1 paths of independently controlled analog intermediate frequency signals, and a radio frequency module for completing signal up-conversion according to the N-1 paths of correction clock signals and the corresponding N-1 paths of independently controlled analog intermediate frequency signals and generating corresponding N-1 paths of independent analog radio frequency signals. The method has the advantages of small hardware volume, low cost, addition of various incoherent interference patterns and high simulation degree of various incoherent interference signals.
Description
Technical Field
The present application relates to the field of navigation interference technologies, and in particular, to a non-coherent multipath interference signal simulator and a method thereof.
Background
N array element anti-interference receiver can resist N-1 coming broadband interference, when the complete machine of the receiver tests the anti-interference performance, N-1 comes to upwards transmit interference signals, because N-1 interference signals require signal incoherent, the structure of 'single interference source + power divider' can not be simply used for realizing N-1 path interference signal output, otherwise, N-1 interference reaching the antenna opening surface of the receiver only has different phases, the power of the same-direction interference signal is enhanced and the power of the reverse interference signal is reduced easily because of signal superposition, and the purpose of applying independent N-1 interference is deviated.
The method for solving the problem commonly used in the industry is to adopt a plurality of interference signal sources, and realize the output of a plurality of paths of incoherent interference signals in a mode that one interference signal source simulates one path of interference signal, thereby completing the anti-interference performance test. In the working mode of the simple stacked signal source, the problems of high cost, large volume and the like are caused. And with the further development of the anti-interference technology of the receiving terminal, in order to continuously enhance the anti-interference performance testing capability, an interference source is continuously added to be used as testing equipment only on the basis of original testing equipment, so that the whole interference testing system is more bloated and has higher cost.
Disclosure of Invention
In view of the above technical problems, the present application provides a non-coherent multipath interference signal simulator, so as to solve the technical problems of a system being too bulky and having a high cost due to the need of using multiple interference signal sources when an interference test system performs an interference resistance test on an N-array element anti-interference receiver.
The technical scheme adopted by the application is as follows:
a non-coherent multi-path interferer simulator, comprising:
the clock generation module is used for generating an original reference clock signal, and the original reference clock signal is a 10MHz signal;
the clock characteristic simulation module is used for dividing the original reference clock signal into N-1 road-based on-time clock signals after frequency multiplication is carried out on the original reference clock signal to a working frequency band, carrying out clock drift self-adaptive adjustment according to a preset clock drift model, carrying out independent clock drift control on the N-1 road-based on-time clock signals respectively, obtaining N-1 paths of corrected clock signals with different clock characteristics, then carrying out frequency reduction on the N-1 paths of corrected clock signals into standard 10MHz clock signals and outputting the standard 10MHz clock signals, wherein the clock characteristics comprise phase values and frequency values, and the preset clock drift model is obtained by analyzing drift change curves of different coded on-orbit satellites of the existing satellite navigation system;
the digital baseband signal generating module is used for generating corresponding N-1 paths of independently controlled digital baseband signals according to the N-1 paths of corrected clock signals;
the DAC module is used for finishing digital-to-analog conversion and generating analog intermediate frequency signals corresponding to the N-1 paths of independent control according to the N-1 paths of corrected clock signals and the corresponding N-1 paths of independent control digital baseband signals;
and the radio frequency module is used for finishing signal up-conversion and generating the corresponding N-1 independent analog radio frequency signals according to the N-1 corrected clock signals and the corresponding N-1 independent analog intermediate frequency signals.
Further, the digital baseband signal generation module is further configured to:
and when the interference types are interference on broadband and narrowband BPSK and QPSK modulation signals, and the corresponding N-1 paths of independently controlled digital baseband signals are generated according to the N-1 paths of corrected clock signals, different spreading codes are selected for each path of independently controlled digital baseband signal.
Further, the digital baseband signal generation module is further configured to:
and when the N-1 paths of independently controlled digital baseband signals are generated according to the N-1 paths of corrected clock signals, different random noise generation seeds are selected for each path of independently controlled digital baseband signals to generate random incoherent noise interference.
Another aspect of the present application further provides a method for simulating an incoherent multi-channel interference signal, including:
s1, generating an original reference clock signal, wherein the original reference clock signal is a 10MHz signal;
s2, after the original reference clock signal is frequency-doubled to a working frequency band, the original reference clock signal is divided into N-1 base punctual clock signals;
s3, performing clock drift self-adaptive adjustment according to a preset clock drift model, performing independent clock drift control on the N-1 road on-time clock signals respectively to obtain N-1 paths of corrected clock signals with different clock characteristics, and reducing the frequency of the N-1 paths of corrected clock signals into standard 10MHz clock signals and outputting the clock signals, wherein the clock characteristics comprise phase values and frequency values, and the preset clock drift model is obtained by analyzing clock drift change curves of different coded on-orbit satellites of the existing satellite navigation system;
s4, generating corresponding N-1 paths of independently controlled digital baseband signals according to the N-1 paths of corrected clock signals;
s5, according to the N-1 paths of corrected clock signals and the corresponding N-1 paths of independently controlled digital baseband signals, digital-to-analog conversion is completed and analog intermediate frequency signals corresponding to the N-1 paths of independent control are generated;
s6, finishing signal up-conversion and generating corresponding N-1 paths of independent analog radio frequency signals according to the N-1 paths of corrected clock signals and the corresponding N-1 paths of independent control analog intermediate frequency signals;
further, the step S3 specifically includes the steps of:
s31, performing clock drift deduction according to a preset clock drift model to generate N-1 clock drift correction values, wherein each clock drift correction value comprises a phase correction value and a frequency correction value, and the preset clock drift model is obtained by analyzing clock drift change curves of different coded on-orbit satellites of the existing satellite navigation system;
s32, modifying the phase value and the frequency value of the N-1 road punctual clock signal according to the N-1 clock drift correction values to obtain an N-1 road correction clock signal with different phase values and frequency values;
further, the step S31 specifically includes the steps of:
s311, analyzing clock drift variation curves of different encoded in-orbit satellites of the existing satellite navigation system, wherein the clock drift variation curves comprise an in-orbit satellite-borne atomic clock drift phase parameter variation curve and an in-orbit satellite-borne atomic clock drift frequency parameter variation curve;
s312, dividing an orbit satellite-borne atomic clock drift phase parameter change curve and an orbit satellite-borne atomic clock drift frequency parameter change curve of an existing satellite navigation system, which are encoded differently, into a linear type, a full parabolic type, a semi-parabolic type, a step linear type and a broken line type according to the change shapes of the curves to obtain corresponding clock drift models, wherein the corresponding clock drift models comprise a clock drift phase parameter change model and a clock drift frequency parameter change model;
s313, randomly selecting a clock drift phase parameter change model and a clock drift frequency parameter change model for each base of the punctual clock signal to perform clock drift deduction, and generating N-1 clock drift correction values, wherein each clock drift correction value comprises a phase correction value and a frequency correction value.
Further, the clock drift phase parameter variation model comprises:
wherein, the first and the second end of the pipe are connected with each other,
is composed ofxA phase value of a time of day; />
The initial phase is preset or set by a user; k 1 the phase change rate is preset or set by a user;xcounting time stamps;R x the chaotic factor obtained by the random function changes randomly along with the time;T b1 a first aging factor, increasing over time; />
The phase value of the turning point moment;a 1 、b 1 、p 1 are all calculated curve control parameters; the step type is formed by combining a linear type and a parabolic type, and is provided with step points, and when the step points are crossed, a primary change model is switched to realize step; the broken line type is formed by combining a plurality of line types, and has a turning point, and a change model is switched when turning occurs.
Further, the clock drift frequency parameter variation model comprises:
whereinFIs composed ofxA frequency value of the time of day;f 0 the initial frequency is preset or set by a user; k 2 the frequency change rate is preset or set by a user;xcounting time stamps;T b2 a second aging factor, increasing in size over time;d 0 the frequency value of the turning point moment;a 2 、b 2 、p 2 are all calculated curve control parameters; the step type is formed by combining a linear type and a parabolic type, is provided with a step point, and switches a primary change model when the step point is crossed so as to realize step; the broken line type is formed by combining a plurality of line types, and has a turning point, and a change model is switched when turning occurs;
whereinD(x) The method is used for describing the drift of frequency generated along with time in a clock drift change model and is expressed by adopting a mode of a sum of a Gaussian model and a random function, wherein the Gaussian model refers to the condition that the clock drift is influenced by additive noise of a hardware device transmission channel in an atomic clock, the random function refers to a chaotic factor which is difficult to predict,D(x) The mathematical expression is as follows:
P(x) Is a Gaussian distribution and can be recorded asN(μ，σ 2 ) One-dimensional probability density can be expressed as:
where μ is the mean of the Gaussian distribution, σ 2 Is the variance of the gaussian distribution;
r x as a random function:
the upper typel L ,l H Respectively, the upper and lower bounds of the random field.
Further, if the interference types are interference to wideband and narrowband BPSK and QPSK modulated signals, then when the corresponding N-1 paths of independently controlled digital baseband signals are generated according to the N-1 paths of corrected clock signals in step S4, different spreading codes are selected for each path of independently controlled digital baseband signal.
Further, if the interference types are noise interference, in step S4, when the corresponding N-1 paths of independently controlled digital baseband signals are generated according to the N-1 paths of corrected clock signals, different random noise generation seeds are selected for each path of independently controlled digital baseband signals to generate random incoherent noise interference.
Compared with the prior art, the method has the following beneficial effects:
the application discloses an incoherent multipath interference signal simulator and a method, wherein the incoherent multipath interference signal simulator comprises a clock generation module for generating an original reference clock signal, a clock characteristic simulation module for generating N-1 paths of corrected clock signals with different clock characteristics, a digital baseband signal generation module for generating corresponding N-1 paths of independently controlled digital baseband signals according to the N-1 paths of corrected clock signals, a DAC module for completing digital-to-analog conversion and generating corresponding N-1 paths of independently controlled analog intermediate frequency signals according to the N-1 paths of corrected clock signals and the corresponding N-1 paths of independently controlled digital baseband signals, and a radio frequency module for completing signal up-conversion and generating corresponding N-1 paths of independent analog radio frequency signals according to the N-1 paths of corrected clock signals and the corresponding N-1 paths of independently controlled analog intermediate frequency signals.
Compared with the prior art, the application has the advantages that:
(1) Hardware volume reduction
According to the multi-channel FPGA clock characteristic simulation device, the clock characteristic simulation module is only added in the FPGA, and the hardware volume is not increased. Compared with the mode of additionally arranging an interference source along with each channel in the prior art, N-1 DACs, radio frequency channels, FPGA baseband signal generation board cards and the like are saved, and the hardware volume is greatly reduced;
(2) Cost reduction
According to the multi-channel FPGA clock characteristic simulation device, the clock characteristic simulation module is only added in the FPGA, and the hardware cost is not increased. Compared with the mode of adding an interference source along with each channel in the prior art, the cost generated by hardware configuration of N-1 DACs, radio frequency channels, FPGA baseband signal generation board cards and the like is saved;
(3) Adding multiple incoherent interference patterns
The incoherent multi-channel interference signal simulator can simulate the working states of crystal oscillators of various interference devices, so that the interference signals of all channels are different in phase and frequency, various incoherent interference patterns which can be set are added, and the blank of the part of test instruments on the market is filled;
(4) The simulation degree of various incoherent interference signals is high
The clock drift model preset in the clock characteristic simulation module is obtained by analyzing the clock drift change curve of the on-orbit satellite according to different codes of the existing satellite navigation system, so that the preset clock drift model and the clock drift change (phase, frequency and frequency drift) curve of the on-orbit satellite have high correlation, the truth of the generated incoherent multi-path interference signal is higher, and the accuracy and the reliability of the complete machine anti-interference performance test of the N-array element anti-interference receiver are ensured.
In addition to the objects, features and advantages described above, other objects, features and advantages will be apparent from the present application. The present application will now be described in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
fig. 1 is a schematic diagram illustrating a module of an incoherent multi-channel interference signal simulator according to a preferred embodiment of the present application;
fig. 2 is a schematic view of an application scenario of an incoherent multi-channel interference signal simulator according to a preferred embodiment of the present application;
fig. 3 is a schematic flow chart of a method for simulating an incoherent multi-channel interference signal according to a preferred embodiment of the present application;
FIG. 4 is a schematic diagram illustrating the substeps of step S3 in the preferred embodiment of the present application;
FIG. 5 is a schematic diagram illustrating the substeps of step S31 in the preferred embodiment of the present application;
FIGS. 6 to 8 are schematic diagrams of time-dependent curves of clock drift phases of three in-orbit satellite atomic clocks randomly sampled and measured respectively;
fig. 9 to fig. 11 are schematic diagrams of time-dependent curves of clock drift frequencies of three in-orbit satellite atomic clocks randomly sampled and measured respectively.
Shown in the figure: 1. a non-coherent multipath interference signal simulator; 2. an anti-interference receiving terminal; 3. an interference antenna; 4. an interference signal; 5. a dark room.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, a preferred embodiment of the present application provides a non-coherent multi-channel interference signal simulator, including:
the clock generation module is used for generating an original reference clock signal, and the original reference clock signal is a 10MHz signal;
the clock characteristic simulation module is used for dividing the original reference clock signal into N-1 road-based on-time clock signals after frequency multiplication is carried out on the original reference clock signal to a working frequency band, carrying out clock drift self-adaptive adjustment according to a preset clock drift model, carrying out independent clock drift control on the N-1 road-based on-time clock signals respectively, obtaining N-1 paths of corrected clock signals with different clock characteristics, then carrying out frequency reduction on the N-1 paths of corrected clock signals into standard 10MHz clock signals and outputting the standard 10MHz clock signals, wherein the clock characteristics comprise phase values and frequency values, and the preset clock drift model is obtained by analyzing drift change curves of different coded on-orbit satellites of the existing satellite navigation system;
the digital baseband signal generating module is used for generating corresponding N-1 paths of independently controlled digital baseband signals according to the N-1 paths of corrected clock signals;
the DAC module is used for finishing digital-to-analog conversion and generating analog intermediate frequency signals which are independently controlled by the corresponding N-1 paths according to the N-1 paths of corrected clock signals and the corresponding N-1 paths of independently controlled digital baseband signals;
and the radio frequency module is used for finishing signal up-conversion and generating the corresponding N-1 paths of independent analog radio frequency signals according to the N-1 paths of corrected clock signals and the corresponding N-1 paths of independent analog intermediate frequency signals.
The incoherent multipath interference signal simulator provided by this embodiment includes a clock generation module for generating an original reference clock signal, a clock characteristic simulation module for generating N-1 paths of corrected clock signals with different clock characteristics, a digital baseband signal generation module for generating corresponding N-1 paths of independently controlled digital baseband signals according to the N-1 paths of corrected clock signals, a DAC module for performing digital-to-analog conversion and generating corresponding N-1 paths of independently controlled analog intermediate frequency signals according to the N-1 paths of corrected clock signals and the corresponding N-1 paths of independently controlled digital baseband signals, and a radio frequency module for performing signal up-conversion and generating corresponding N-1 paths of independently controlled analog radio frequency signals according to the N-1 paths of corrected clock signals and the corresponding N-1 paths of independently controlled analog intermediate frequency signals, where the clock generation module and the clock characteristic simulation module are both disposed in an FPGA.
Compared with the prior art, the advantages of the non-coherent multi-channel interference signal simulator of the embodiment include:
(1) Hardware volume reduction
The multi-channel simulation circuit of the embodiment only adds a clock characteristic simulation module in the FPGA, and does not increase the hardware volume. Compared with the mode of adding an interference source along with each channel in the prior art, N-1 DACs, radio frequency channels, FPGA baseband signal generation board cards and the like are saved, and the hardware volume is greatly reduced;
(2) Cost reduction
In the multi-channel circuit, only a clock characteristic simulation module is added in the FPGA, and the hardware cost is not increased. Compared with the mode of adding an interference source along with each channel in the prior art, the cost generated by hardware configuration of N-1 DACs, radio frequency channels, FPGA baseband signal generation board cards and the like is saved;
(3) Adding multiple incoherent interference patterns
The incoherent multi-channel interference signal simulator can simulate the working states of crystal oscillators of various interference devices, so that the interference signals of various channels are different in phase and frequency, various incoherent interference patterns capable of being set are added, and the blank of the part of test instruments on the market is filled;
(4) The simulation degree of various incoherent interference signals is high
The clock drift model preset in the clock characteristic simulation module of the embodiment is obtained by analyzing the clock drift change curve of the on-orbit satellite according to different codes of the existing satellite navigation system, so that the preset clock drift model has high correlation with the clock drift change (phase, frequency and frequency drift) curve of the on-orbit satellite, the truth of the generated incoherent multi-path interference signal is higher, and the accuracy and reliability of the complete machine anti-interference performance test of the N-array element anti-interference receiver are ensured.
In a preferred embodiment of the present application, the digital baseband signal generating module is further configured to:
and when the interference types are interference on BPSK and QPSK modulation signals of broadband and narrowband, and the corresponding N-1 paths of independently controlled digital baseband signals are generated according to the N-1 paths of corrected clock signals, different spreading codes are selected for each path of independently controlled digital baseband signal.
For wideband and narrowband BPSK and QPSK modulation signal interference, in this embodiment, based on the foregoing embodiment, performing clock drift adaptive adjustment according to a preset clock drift model, and performing independent clock drift control on the N-1 base clock signal, respectively, to obtain N-1 paths of corrected clock signals with different clock characteristics, the embodiment further provides a difference of spreading codes of each path, selects different spreading codes for each path of independently controlled digital baseband signal, and can perform program control, thereby further enhancing the non-correlation between the output multi-channel interference signals.
In a preferred embodiment of the present application, the digital baseband signal generating module is further configured to:
and when the N-1 paths of independently controlled digital baseband signals are generated according to the N-1 paths of corrected clock signals, different random noise generation seeds are selected for each path of independently controlled digital baseband signals to generate random incoherent noise interference.
For noise interference, the embodiment performs clock drift adaptive adjustment according to a preset clock drift model, performs independent clock drift control on the N-1 base clock signal respectively, and further provides the difference of noise seeds of each channel on the basis of obtaining N-1 paths of corrected clock signals with different clock characteristics, selects different random noise generation seeds for each path of independently controlled digital baseband signal to generate random incoherent noise interference, and can perform program control, thereby further enhancing the non-correlation between the output multi-channel interference signals.
An application scenario of the incoherent multi-channel interference signal simulator of the present application is shown in fig. 2, where the incoherent multi-channel interference signal simulator 1 outputs four interference signals 4 through four interference antennas 3 arranged in a darkroom 5, and four coming interference resistance tests are performed on the interference-resistant receiving terminal 2.
As shown in fig. 3, another preferred embodiment of the present application further provides a method for simulating an incoherent multipath interference signal, including the steps of:
s1, generating an original reference clock signal, wherein the original reference clock signal is a 10MHz signal;
s2, after the frequency of the original reference clock signal is multiplied to a working frequency band, the original reference clock signal is divided into an N-1 road reference clock signal;
s3, performing clock drift self-adaptive adjustment according to a preset clock drift model, performing independent clock drift control on the on-time clock signals of the N-1 road respectively to obtain N-1 paths of corrected clock signals with different clock characteristics, and performing frequency reduction on the N-1 paths of corrected clock signals into standard 10MHz clock signals and outputting the standard 10MHz clock signals, wherein the clock characteristics comprise a phase value and a frequency value, and the preset clock drift model is obtained by analyzing clock drift change curves of different coded on-orbit satellites of the existing satellite navigation system;
s4, generating corresponding N-1 paths of independently controlled digital baseband signals according to the N-1 paths of corrected clock signals;
s5, according to the N-1 paths of corrected clock signals and the corresponding N-1 paths of independently controlled digital baseband signals, digital-to-analog conversion is completed and analog intermediate frequency signals corresponding to the N-1 paths of independent control are generated;
and S6, finishing signal up-conversion and generating the corresponding N-1 paths of independent analog radio frequency signals according to the N-1 paths of corrected clock signals and the corresponding N-1 paths of independent analog intermediate frequency signals.
Compared with the prior art, the incoherent multi-channel interference signal simulation method of the embodiment has the advantages that:
(1) Hardware volume reduction
The multi-channel self-adaptive clock drift adjustment is carried out according to the preset clock drift model, independent clock drift control is carried out on the on-time clock signals of the N-1 road respectively, extra hardware is not needed, and the hardware volume is not increased. Compared with the mode of additionally arranging an interference source along with each channel in the prior art, N-1 DACs, radio frequency channels, FPGA baseband signal generation board cards and the like are saved, and the hardware volume is greatly reduced;
(2) Cost reduction
The multi-channel clock drift self-adaptive adjustment method is used for performing clock drift self-adaptive adjustment according to the preset clock drift model, performing independent clock drift control on the on-time clock signals of the N-1 road, and not increasing hardware cost. Compared with the mode of adding an interference source along with each channel in the prior art, the cost generated by hardware configuration of N-1 DACs, radio frequency channels, FPGA baseband signal generation board cards and the like is saved;
(3) Adding a plurality of non-coherent interference patterns
The embodiment can simulate the working states of crystal oscillators of various interference devices, so that the phases and the frequencies of various interference signals are different, various incoherent interference patterns which can be set are added, and the blank of the part of test instruments on the market is filled;
(4) Multiple incoherent interference signals have high simulation degree
The preset clock drift model is obtained by analyzing the clock drift change curve of the on-orbit satellite according to different codes of the existing satellite navigation system, so that the preset clock drift model has high correlation with the clock drift change (phase, frequency and frequency drift) curve of the on-orbit satellite, the truth of the generated incoherent multi-path interference signal is higher, and the accuracy and reliability of the complete machine anti-interference performance test of the N-array element anti-interference receiver are ensured.
As shown in fig. 4, in a preferred embodiment of the present application, the step S3 specifically includes the steps of:
s31, performing clock drift deduction according to a preset clock drift model to generate N-1 clock drift correction values, wherein each clock drift correction value comprises a phase correction value and a frequency correction value, and the preset clock drift model is obtained by analyzing clock drift change curves of different coded on-orbit satellites of the existing satellite navigation system;
s32, modifying the phase value and the frequency value of the N-1 road reference clock signal according to the N-1 clock drift correction values to obtain an N-1 road correction clock signal with different phase values and frequency values.
In the embodiment, when clock drift adaptive adjustment is carried out according to a preset clock drift model and independent clock drift control is respectively carried out on N-1-path on-time clock signals, clock drift deduction is carried out according to the preset clock drift model to generate N-1 clock drift correction values, each clock drift correction value comprises a phase correction value and a frequency correction value, and then phase values and frequency values of the N-1-path on-time clock signals are modified according to the N-1 clock drift correction values to obtain N-1-path corrected clock signals with different phase values and frequency values, so that the N-1-path corrected clock signals with different phase values and frequency values are obtained, and the problem that in the prior art, N-1 interference reaching the antenna surface of a receiver only has different phases, the power of a same-direction interference signal is enhanced and the power of a reverse interference signal is reduced due to signal superposition, the noncoherence of each path of signals is ensured, and meanwhile, the preset clock drift model has high correlation with a clock drift change (phase, frequency and frequency drift) curve of an on-orbit satellite is ensured, so that the truth degree of the generated incoherent multipath interference signals is higher, and the complete set interference resistance reliability of an anti-interference receiver is ensured.
As shown in fig. 5, in a preferred embodiment of the present application, the step S31 specifically includes the steps of:
s311, analyzing clock drift variation curves of different encoding in-orbit satellites of the existing satellite navigation system, wherein the clock drift variation curves comprise an in-orbit satellite-borne atomic clock drift phase parameter variation curve and an in-orbit satellite-borne atomic clock drift frequency parameter variation curve (see the graphs in FIGS. 6 to 11);
s312, dividing an orbit satellite-borne atomic clock drift phase parameter change curve and an orbit satellite-borne atomic clock drift frequency parameter change curve of an existing satellite navigation system, which are encoded differently, into a linear type, a full parabolic type, a semi-parabolic type, a step linear type and a broken line type according to the change shapes of the curves to obtain corresponding clock drift models, wherein the corresponding clock drift models comprise a clock drift phase parameter change model and a clock drift frequency parameter change model;
and S313, randomly selecting a clock drift phase parameter change model and a clock drift frequency parameter change model for each base of the punctual clock signal to perform clock drift deduction, and generating N-1 clock drift correction values, wherein each clock drift correction value comprises a phase correction value and a frequency correction value.
According to the method, when a preset clock drift model is obtained by analyzing clock drift change curves of different on-orbit satellites coded by the existing satellite navigation system, according to characteristics of curve change shapes of an on-orbit satellite-borne atomic clock drift phase parameter change curve and an on-orbit satellite-borne atomic clock drift frequency parameter change curve of different on-orbit satellites coded by the existing satellite navigation system, the preset clock drift model is classified into typical line types of a line type, a full parabola type, a half parabola type, a step line type and a broken line type, the preset clock drift model can basically represent the change curves of the on-orbit satellite-borne atomic clock drift phase parameter change curves and the change shapes of the on-orbit satellite-borne atomic clock drift frequency parameter change curves coded by all the existing satellite navigation systems, therefore, as simplification, the corresponding clock drift models are respectively obtained according to various typical line types of the curve types, the corresponding clock drift models comprise a clock drift phase parameter change model and a clock drift frequency parameter change model, the corresponding clock drift phase value model can be deduced according to the corresponding clock drift model, on-time, the clock drift model is adopted for improving non-coherence, the clock drift model, the clock drift parameters and the clock drift model is selected for generating non-on-time, and the clock drift parameters of each clock drift model, and the clock drift parameters of the non-drift model are generated, and the non-of the clock drift model, and the non-of the clock drift parameters of the clock drift model are randomly generated.
Specifically, the clock drift phase parameter variation model includes:
wherein the content of the first and second substances,
is composed ofxA phase value of a time of day; />
The initial phase is preset or set by a user; k 1 the phase change rate is preset or set by a user;xcounting time stamps;R x the chaotic factor obtained by the random function changes randomly along with the time;T b1 a first aging factor, increasing in time; />
The phase value of the turning point moment;a 1 、b 1 、p 1 are all calculated curve control parameters; the step type is formed by combining a linear type and a parabolic type, is provided with a step point, and switches a primary change model when the step point is crossed so as to realize step; the broken line type is formed by combining a plurality of line types, and has a turning point, and a change model is switched when turning occurs.
Specifically, the clock drift frequency parameter variation model includes:
whereinFIs composed ofxA frequency value of the time of day;f 0 the initial frequency is preset or set by a user; k 2 the frequency change rate is preset or set by a user;xcounting time stamps;T b2 a second aging factor, increasing in time;d 0 the frequency value of the turning point moment;a 2 、b 2 、p 2 are all calculated curve control parameters; the step type is formed by combining a linear type and a parabolic type, is provided with a step point, and switches a primary change model when the step point is crossed so as to realize step; the broken line type is formed by combining a plurality of line types, and has a turning point, and a change model is switched when turning occurs;
whereinD(x) The method is used for describing the frequency drift generated along with time in a clock drift change model and is expressed by adopting a mode of the sum of a Gaussian model and a random function, wherein the Gaussian model refers to the condition that the clock drift is influenced by additive noise of a hardware device transmission channel in an atomic clock, the random function refers to a chaotic factor which is difficult to predict,D(x) The mathematical expression is as follows:
P(x) Can be recorded as N (mu, sigma) for Gaussian distribution 2 ) One-dimensional probability density can be expressed as:
where μ is the mean of the Gaussian distribution, σ 2 Is the variance of the gaussian distribution;
r x as a random function:
the upper typel L ,l H Respectively, the upper and lower bounds of the random field.
In the preferred embodiment of the present application, if the interference types are interference to wideband and narrowband BPSK and QPSK modulated signals, different spreading codes are selected for each path of independently controlled digital baseband signal when the corresponding N-1 paths of independently controlled digital baseband signals are generated according to the N-1 paths of modified clock signals in step S4.
For wideband and narrowband BPSK and QPSK modulation signal interference, the embodiment further provides a difference between spreading codes of each channel on the basis that the embodiment performs clock drift adaptive adjustment according to a preset clock drift model, performs independent clock drift control on the N-1 base clock signal respectively to obtain N-1 paths of corrected clock signals with different clock characteristics, and selects different spreading codes for each path of independently controlled digital baseband signal, and can perform program control, thereby further enhancing the non-correlation between the output multi-channel interference signals.
In the preferred embodiment of the present application, if the plurality of interference types are noise interference, then when the corresponding N-1 channels of independently controlled digital baseband signals are generated according to the N-1 channels of modified clock signals in step S4, different random noise generation seeds are selected for each channel of independently controlled digital baseband signals to generate random incoherent noise interference.
For noise interference, the embodiment performs clock drift adaptive adjustment according to a preset clock drift model, performs independent clock drift control on the N-1 base clock signal respectively, and further provides the difference of noise seeds of each channel on the basis of obtaining N-1 paths of corrected clock signals with different clock characteristics, selects different random noise generation seeds for each path of independently controlled digital baseband signal to generate random incoherent noise interference, and can perform program control, thereby further enhancing the non-correlation between the output multi-channel interference signals.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. An incoherent multi-path interference signal simulator, comprising:
the clock generation module is used for generating an original reference clock signal, and the original reference clock signal is a 10MHz signal;
the clock characteristic simulation module is used for dividing the original reference clock signal into N-1 road-based on-time clock signals after frequency multiplication is carried out on the original reference clock signal to a working frequency band, carrying out clock drift self-adaptive adjustment according to a preset clock drift model, carrying out independent clock drift control on the N-1 road-based on-time clock signals respectively, obtaining N-1 paths of corrected clock signals with different clock characteristics, then carrying out frequency reduction on the N-1 paths of corrected clock signals into standard 10MHz clock signals and outputting the standard 10MHz clock signals, wherein the clock characteristics comprise phase values and frequency values, and the preset clock drift model is obtained by analyzing drift change curves of different coded on-orbit satellites of the existing satellite navigation system;
the digital baseband signal generating module is used for generating corresponding N-1 paths of independently controlled digital baseband signals according to the N-1 paths of corrected clock signals;
the DAC module is used for finishing digital-to-analog conversion and generating analog intermediate frequency signals which are independently controlled by the corresponding N-1 paths according to the N-1 paths of corrected clock signals and the corresponding N-1 paths of independently controlled digital baseband signals;
and the radio frequency module is used for finishing signal up-conversion and generating the corresponding N-1 paths of independent analog radio frequency signals according to the N-1 paths of corrected clock signals and the corresponding N-1 paths of independent analog intermediate frequency signals.
2. The non-coherent multi-channel interferer simulator of claim 1, wherein said digital baseband signal generation module is further configured to:
and when the interference types are interference on broadband and narrowband BPSK and QPSK modulation signals, and the corresponding N-1 paths of independently controlled digital baseband signals are generated according to the N-1 paths of corrected clock signals, different spreading codes are selected for each path of independently controlled digital baseband signal.
3. The non-coherent multi-channel interferer simulator of claim 1, wherein said digital baseband signal generation module is further configured to:
and when the N-1 paths of independently controlled digital baseband signals are generated according to the N-1 paths of corrected clock signals, different random noise generation seeds are selected for each path of independently controlled digital baseband signals to generate random incoherent noise interference.
4. A method for simulating an incoherent multipath interference signal, comprising the steps of:
s1, generating an original reference clock signal, wherein the original reference clock signal is a 10MHz signal;
s2, after the original reference clock signal is frequency-doubled to a working frequency band, the original reference clock signal is divided into N-1 base punctual clock signals;
s3, performing clock drift self-adaptive adjustment according to a preset clock drift model, performing independent clock drift control on the on-time clock signals of the N-1 road respectively to obtain N-1 paths of corrected clock signals with different clock characteristics, and performing frequency reduction on the N-1 paths of corrected clock signals into standard 10MHz clock signals and outputting the standard 10MHz clock signals, wherein the clock characteristics comprise a phase value and a frequency value, and the preset clock drift model is obtained by analyzing clock drift change curves of different coded on-orbit satellites of the existing satellite navigation system;
s4, generating corresponding N-1 paths of independently controlled digital baseband signals according to the N-1 paths of corrected clock signals;
s5, completing digital-to-analog conversion and generating analog intermediate frequency signals corresponding to the N-1 paths of independent control according to the N-1 paths of corrected clock signals and the corresponding N-1 paths of independent control digital baseband signals;
and S6, finishing signal up-conversion and generating the corresponding N-1 paths of independent analog radio frequency signals according to the N-1 paths of corrected clock signals and the corresponding N-1 paths of independent analog intermediate frequency signals.
5. The method according to claim 4, wherein the step S3 specifically comprises the steps of:
s31, performing clock drift deduction according to a preset clock drift model to generate N-1 clock drift correction values, wherein each clock drift correction value comprises a phase correction value and a frequency correction value, and the preset clock drift model is obtained by analyzing clock drift change curves of different coded on-orbit satellites of the existing satellite navigation system;
s32, modifying the phase value and the frequency value of the N-1 road reference clock signal according to the N-1 clock drift correction values to obtain an N-1 road correction clock signal with different phase values and frequency values.
6. The method according to claim 5, wherein the step S31 specifically comprises the steps of:
s311, analyzing clock drift variation curves of different encoded in-orbit satellites of the existing satellite navigation system, wherein the clock drift variation curves comprise an in-orbit satellite-borne atomic clock drift phase parameter variation curve and an in-orbit satellite-borne atomic clock drift frequency parameter variation curve;
s312, dividing an orbit satellite-borne atomic clock drift phase parameter change curve and an orbit satellite-borne atomic clock drift frequency parameter change curve of an orbit satellite, which are encoded differently by the existing satellite navigation system, into a linear type, a full parabolic type, a semi-parabolic type, a step linear type and a broken line type according to the curve change shapes to obtain corresponding clock drift models, wherein the corresponding clock drift models comprise a clock drift phase parameter change model and a clock drift frequency parameter change model;
s313, randomly selecting a clock drift phase parameter change model and a clock drift frequency parameter change model for each base of the punctual clock signal to perform clock drift deduction, and generating N-1 clock drift correction values, wherein each clock drift correction value comprises a phase correction value and a frequency correction value.
7. The method of claim 6, wherein the clock drift phase parameter variation model comprises:
wherein the content of the first and second substances,
is composed ofxA phase value of a time of day; />
The initial phase is preset or set by a user; k 1 the phase change rate is preset or set by a user;xcounting time stamps;R x the chaotic factor obtained by the random function changes randomly along with the time;T b1 a first aging factor, increasing over time; />
The phase value of the turning point moment;a 1 、b 1 、p 1 are all calculated curve control parameters; the step type is formed by combining a linear type and a parabolic type, is provided with a step point, and switches a primary change model when the step point is crossed so as to realize step; the broken line type is formed by combining a plurality of line types, and has a turning point, and a change model is switched when turning occurs.
8. The method of claim 6, wherein the clock drift frequency parameter variation model comprises:
whereinFIs composed ofxA frequency value of the time of day;f 0 the initial frequency is preset or set by a user; k 2 for the rate of change of frequency, preset or set by the user；xCounting time stamps;T b2 a second aging factor, increasing in size over time;d 0 the frequency value of the turning point moment;a 2 、b 2 、p 2 are all calculated curve control parameters; the step type is formed by combining a linear type and a parabolic type, is provided with a step point, and switches a primary change model when the step point is crossed so as to realize step; the broken line type is formed by combining a plurality of line types, and has a turning point, and a change model is switched when turning occurs;
whereinD(x) The method is used for describing the drift of frequency generated along with time in a clock drift change model and is expressed by adopting a mode of a sum of a Gaussian model and a random function, wherein the Gaussian model refers to the condition that the clock drift is influenced by additive noise of a hardware device transmission channel in an atomic clock, the random function refers to a chaotic factor which is difficult to predict,D(x) The mathematical expression is as follows:
P(x) Can be recorded as N (mu, sigma) for Gaussian distribution 2 ) One-dimensional probability density can be expressed as:
where μ is the mean of the Gaussian distribution, σ 2 Is the variance of the gaussian distribution;
r x as a random function:
the upper typel L ,l H Respectively, the upper and lower bounds of the random field.
9. The method of claim 4, wherein the method further comprises:
and if the interference types are the interference to the BPSK and QPSK modulation signals of the broadband and the narrowband, different spreading codes are selected for each path of independently controlled digital baseband signal when the corresponding N-1 paths of independently controlled digital baseband signals are generated according to the N-1 paths of corrected clock signals in the step S4.
10. The method of claim 4, wherein the method further comprises: if the interference types are noise interference, in step S4, when the corresponding N-1 paths of independently controlled digital baseband signals are generated according to the N-1 paths of corrected clock signals, different random noise generation seeds are selected for each path of independently controlled digital baseband signals to generate random incoherent noise interference.
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