CN115987309B - Incoherent multipath interference signal simulator and method - Google Patents
Incoherent multipath interference signal simulator and method Download PDFInfo
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Abstract
The application discloses a non-coherent multipath interference signal simulator and a method, wherein 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 modified 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 modified clock signals, a DAC module for completing digital conversion according to the N-1 paths of modified 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 modified 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, multiple incoherent interference patterns and high simulation degree of multiple incoherent interference signals.
Description
Technical Field
The present disclosure relates to the field of navigation interference technologies, and in particular, to a non-coherent multipath interference signal simulator and a method.
Background
The N array element anti-interference receiver can resist N-1 incoming broadband interference, when the receiver is used for testing anti-interference performance, N-1 interference signals are required to be transmitted upwards, as N-1 interference signals are incoherent, N-1 interference signal output cannot be realized by a simple structure of a single interference source and a power divider, otherwise, N-1 interference arriving at the antenna port surface of the receiver only has different phases, the power of the co-directional interference signals is easily enhanced and the power of the reverse interference signals is easily reduced due to signal superposition, and the aim of applying independent N-1 interference is fulfilled. The common method for solving the problem in the industry is to adopt a mode that a plurality of interference signal sources and one interference signal source simulate one interference signal so as to realize the output of multiple incoherent interference signals and finish 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 anti-interference technology of the receiving terminal, in order to continuously enhance the anti-interference performance testing capability, an interference source can be continuously added as testing equipment on the basis of the original testing equipment, so that the whole interference testing system is increasingly bulked and has higher cost.
Disclosure of Invention
According to the technical problem, the incoherent multipath interference signal simulator is provided on one hand, so that the technical problems of system swelling and high cost caused by adopting a plurality of interference signal sources when an interference test system tests the anti-interference performance of an N-array element anti-interference receiver are solved.
The technical scheme adopted by the application is as follows:
a non-coherent multipath interference signal simulator comprising:
the clock generation module is used for generating an original reference clock signal, wherein the original reference clock signal is a 10MHz signal;
the clock characteristic simulation module is used for dividing the power of the original reference clock signal after frequency multiplication to the working frequency band into N-1 reference clock signals, carrying out clock Zhong Piao self-adaptive adjustment according to a preset Zhong Piao model, respectively carrying out independent Zhong Piao control on the N-1 reference clock signals to obtain N-1 paths of corrected clock signals with different clock characteristics, and 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 a phase value and a frequency value, and the preset Zhong Piao model is obtained according to Zhong Piao change curve analysis of different codes 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 according to the N-1 paths of modified 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;
the radio frequency module is used for 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 independently controlled analog intermediate frequency signals.
Further, the digital baseband signal generation module is further configured to:
the interference of the various scrambling types to the BPSK and QPSK modulated signals of the broadband and the narrowband is that 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 spreading codes are selected for each path of independently controlled digital baseband signals.
Further, the digital baseband signal generation module is further configured to:
the noise interference is generated by selecting different random noise generation seeds for each path of independently controlled digital baseband signal when the corresponding N-1 path of independently controlled digital baseband signal is generated according to the N-1 path of corrected clock signal.
In another aspect, the present application further provides a method for simulating incoherent multipath interference signals, including the steps of:
s1, generating an original reference clock signal, wherein the original reference clock signal is a 10MHz signal;
s2, multiplying the frequency of the original reference clock signal to a working frequency band and then dividing the power into N-1 reference clock signals;
s3, performing clock Zhong Piao self-adaptive adjustment according to a preset Zhong Piao model, respectively performing independent Zhong Piao control on N-1-reference clock signals to obtain N-1-path corrected clock signals with different clock characteristics, down-converting the N-1-path 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 Zhong Piao model is obtained by analyzing Zhong Piao change curves of different codes 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, finishing digital-to-analog conversion and generating corresponding N-1 paths of independently controlled analog intermediate frequency signals;
s6, according to the N-1 paths of corrected clock signals and the corresponding N-1 paths of independently controlled analog intermediate frequency signals, signal up-conversion is completed, and corresponding N-1 paths of independent analog radio frequency signals are generated.
Further, the step S3 specifically includes the steps of:
s31, carrying out clock Zhong Piao deduction according to a preset Zhong Piao model to generate N-1 Zhong Piao correction values, wherein each clock drift correction value comprises a phase correction value and a frequency correction value, and the preset Zhong Piao model is obtained by analyzing Zhong Piao change curves of different encoding in-orbit satellites of the existing satellite navigation system;
s32, modifying the phase value and the frequency value of the N-1 reference clock signal according to N-1 Zhong Piao correction values to obtain N-1 paths of corrected clock signals with different phase values and frequency values.
Further, the step S31 specifically includes the steps of:
s311, analyzing Zhong Piao change curves of different encoded on-orbit satellites of the existing satellite navigation system, wherein the Zhong Piao change curves comprise a phase parameter change curve of an on-orbit satellite-borne atomic clock Zhong Piao and a frequency parameter change curve of the on-orbit satellite-borne atomic clock Zhong Piao;
s312, dividing the phase parameter change curves of the on-orbit satellite-borne atomic clocks Zhong Piao of the satellites in orbit and the frequency parameter change curves of the on-orbit satellite-borne atomic clocks Zhong Piao of the existing satellite navigation system into linear, full parabolic, semi-parabolic, step linear and broken line types according to curve change shapes to obtain corresponding Zhong Piao models, wherein the corresponding Zhong Piao models comprise Zhong Piao phase parameter change models and Zhong Piao frequency parameter change models;
s313, a Zhong Piao phase parameter change model and a Zhong Piao frequency parameter change model are randomly selected for each standard clock signal to carry out clock Zhong Piao deduction, and N-1 Zhong Piao correction values are generated, wherein each clock drift correction value comprises a phase correction value and a frequency correction value.
Further, the Zhong Piao phase parameter variation model includes:
wherein phi is the phase value at the moment x;
the initial phase is preset or set by a user; k (k) 1 The phase change rate is preset or set by a user; x is the timestamp count; r is R x The chaos factor is obtained through a random function and randomly changes along with time; t (T) b1 As a first aging factor, increasing over time; phi (phi) 0 The phase value is the turning point moment; a, a 1 、b 1 、p 1 All are calculated curve control parameters; the step type is formed by combining a linear type and a parabolic type, and is provided with a step point, and when the step point is crossed, a one-time change model is switched to realize the step; the folding line type is formed by combining a plurality of line types and is provided with a folding point, and the change model is switched when the folding occurs.
Further, the Zhong Piao frequency parameter variation model includes:
wherein F is the frequency value at the moment x; f (f) 0 The initial frequency is preset or set by a user; k (k) 2 The frequency change rate is preset or set by a user; x is the timestamp count; t (T) b2 Is a second aging factor, increasing over time; d, d 0 The frequency value at the moment of the turning point; a, a 2 、b 2 、p 2 All are calculated curve control parameters; the step type is formed by combining a linear type and a parabolic type, and is provided with a step point, and when the step point is crossed, a one-time change model is switched to realize the step; the folding line type is formed by combining a plurality of line types and is provided with a folding point, and a change model is switched when the folding occurs;
wherein D (x) is used for describing the drift of frequency generated with time in a Zhong Piao variation model, and is represented by a gaussian model and a random function, wherein the gaussian model is Zhong Piao affected by additive noise of a transmission channel of a hardware device in an atomic clock, the random function is a chaos factor which is difficult to predict, and the mathematical expression of D (x) is as follows:
D(x)＝P(x)+R x
p (x) is a Gaussian distribution and can be expressed as N (μ, σ) 2 ) Its one-dimensional probability density can be expressed as:
wherein μ is the mean value of the Gaussian distribution, σ 2 Is the variance of the gaussian distribution;
R x as a random function:
R x ＝Rand(l L ，l H )；
above l L ,l H The upper and lower bounds of the random field, respectively.
Further, if the scrambling types are interference to wideband, narrowband BPSK and QPSK modulated signals, different spreading codes are selected for each path of independently controlled digital baseband signal when generating a corresponding N-1 path of independently controlled digital baseband signal according to the N-1 path of modified clock signal in step S4.
Further, if the plurality of scrambling types are noise interference, in step S4, when generating the corresponding N-1 paths of independently controlled digital baseband signals according to the N-1 paths of modified 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 application has the following beneficial effects:
the application discloses a non-coherent multipath interference signal simulator and a method, wherein the non-coherent 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 modified 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 modified clock signals, a DAC module for completing digital conversion and generating corresponding N-1 paths of independently controlled analog intermediate frequency signals according to the N-1 paths of modified clock signals and the corresponding N-1 paths of independently controlled analog intermediate frequency signals, and a radio frequency module for completing signal up-conversion and generating corresponding N-1 paths of independently controlled analog radio frequency signals according to the N-1 paths of modified clock signals and the corresponding N-1 paths of independently controlled analog intermediate frequency signals.
Advantages of the present application compared to the prior art include:
(1) Hardware volume reduction
According to the multi-channel simulation system, the clock characteristic simulation module is only added in the FPGA, and the hardware volume is not increased. Compared with the prior art, the method of adding an interference source along with each channel saves N-1 DACs, radio frequency channels, FPGA baseband signals, generates a board card and the like, and greatly reduces the hardware volume.
(2) Cost reduction
According to the multi-channel simulation system, the clock characteristic simulation module is only added in the FPGA, and hardware cost is not increased. Compared with the prior art, the method of adding the interference source along with each channel saves the cost generated by hardware configuration such as a board card generated by N-1 DAC, a radio frequency channel and FPGA baseband signals.
(3) Multiple incoherent interference patterns are added
The incoherent multipath interference signal simulator can simulate the working states of various interference equipment crystal oscillators, so that each path of interference signal is different in phase and frequency, various incoherent interference patterns which can be set are added, and the gap of the part of the test instrument on the market is filled.
(4) Multiple incoherent interference signals have high simulation degree
According to the clock characteristic simulation module, the preset Zhong Piao model is obtained by analyzing Zhong Piao change curves of different codes of the existing satellite navigation system, so that the preset Zhong Piao model has high correlation with Zhong Piao change (phase, frequency and frequency drift) curves of the in-orbit satellite, the generated incoherent multipath interference signals are higher in reality, and the accuracy and reliability of the whole anti-interference performance test of the N-array-element anti-interference receiver are ensured.
In addition to the objects, features, and advantages described above, there are other objects, features, and advantages of the present application. The present application will be described in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, illustrate and explain the application and are not to be construed as limiting the application. In the drawings:
fig. 1 is a schematic diagram of a non-coherent multipath interference signal simulator module according to a preferred embodiment of the present application.
Fig. 2 is a schematic diagram of an application scenario of an incoherent multipath interference signal simulator according to a preferred embodiment of the present application.
Fig. 3 is a schematic flow chart of a method for simulating incoherent multipath interference signals according to a preferred embodiment of the present application.
Fig. 4 is a schematic diagram of the substeps of step S3 in the preferred embodiment of the present application.
Fig. 5 is a schematic diagram of the substeps of step S31 in the preferred embodiment of the present application.
Fig. 6 to 8 are schematic diagrams of phase change curves of three in-orbit satellite atomic clocks Zhong Piao of random spot measurement with time.
Fig. 9 to 11 are schematic diagrams of frequency-time curves of three in-orbit satellite atomic clocks Zhong Piao for random spot measurement.
The figure shows: 1. a non-coherent multipath interference signal simulator; 2. an anti-interference receiving terminal; 3. an interfering antenna; 4. an interference signal; 5. a darkroom.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Referring to fig. 1, a preferred embodiment of the present application provides a non-coherent multipath interference signal simulator, comprising:
the clock generation module is used for generating an original reference clock signal, wherein the original reference clock signal is a 10MHz signal;
the clock characteristic simulation module is used for dividing the power of the original reference clock signal after frequency multiplication to the working frequency band into N-1 reference clock signals, carrying out clock Zhong Piao self-adaptive adjustment according to a preset Zhong Piao model, respectively carrying out independent Zhong Piao control on the N-1 reference clock signals to obtain N-1 paths of corrected clock signals with different clock characteristics, and 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 a phase value and a frequency value, and the preset Zhong Piao model is obtained according to Zhong Piao change curve analysis of different codes 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 according to the N-1 paths of modified 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;
the radio frequency module is used for 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 independently controlled analog intermediate frequency signals.
The incoherent multipath interference signal simulator provided by the embodiment comprises a clock generation module for generating an original reference clock signal, a clock characteristic simulation module for generating N-1 paths of modified 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 modified clock signals, a DAC module for completing digital conversion and generating corresponding N-1 paths of independently controlled analog intermediate frequency signals according to the N-1 paths of modified 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 independently controlled analog radio frequency signals according to the N-1 paths of modified clock signals and the corresponding N-1 paths of independently controlled analog intermediate frequency signals, wherein the clock generation module and the clock characteristic simulation module are both arranged in an FPGA.
Compared with the prior art, the incoherent multipath interference signal simulator of the present embodiment has the following advantages:
(1) Hardware volume reduction
In the multi-channel of the embodiment, the clock characteristic simulation module is only added in the FPGA, and the hardware volume is not increased. Compared with the prior art, the method of adding an interference source along with each channel saves N-1 DACs, radio frequency channels, FPGA baseband signals, generates a board card and the like, and greatly reduces the hardware volume.
(2) Cost reduction
In the multi-channel of the embodiment, the clock characteristic simulation module is only added in the FPGA, so that the hardware cost is not increased. Compared with the prior art, the method of adding the interference source along with each channel saves the cost generated by hardware configuration such as a board card generated by N-1 DAC, a radio frequency channel and FPGA baseband signals.
(3) Multiple incoherent interference patterns are added
The incoherent multipath interference signal simulator of the embodiment can simulate the working states of the crystal oscillator of various interference devices, so that each path of interference signal is different in phase and frequency, various incoherent interference patterns which can be set are added, and the blank of the part of the test instrument in the market is filled.
(4) Multiple incoherent interference signals have high simulation degree
According to the clock characteristic simulation module, a preset Zhong Piao model is obtained by analyzing Zhong Piao change curves of different encoded in-orbit satellites of an existing satellite navigation system, so that the preset Zhong Piao model has high correlation with Zhong Piao change (phase, frequency and frequency drift) curves of the in-orbit satellites, the reality of a generated incoherent multipath interference signal is higher, and the accuracy and reliability of the whole anti-interference performance test of an N-array element anti-interference receiver are ensured.
In a preferred embodiment of the present application, the digital baseband signal generation module is further configured to:
the interference of the various scrambling types to the BPSK and QPSK modulated signals of the broadband and the narrowband is that 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 spreading codes are selected for each path of independently controlled digital baseband signals.
Aiming at the interference of broadband, narrowband BPSK and QPSK modulation signals, the clock Zhong Piao is adaptively adjusted according to a preset Zhong Piao model in the embodiment, the N-1 standard clock signals are respectively and independently Zhong Piao controlled to obtain N-1 paths of corrected clock signals with different clock characteristics, the difference of spreading codes of each path is further provided, different spreading codes are selected for each path of independently controlled digital baseband signal, and the digital baseband signal can be programmed, so that the irrelevance among the output multichannel interference signals is further enhanced.
In a preferred embodiment of the present application, the digital baseband signal generation module is further configured to:
the noise interference is generated by selecting different random noise generation seeds for each path of independently controlled digital baseband signal when the corresponding N-1 path of independently controlled digital baseband signal is generated according to the N-1 path of corrected clock signal.
Aiming at noise interference, the embodiment carries out clock Zhong Piao self-adaptive adjustment according to a preset Zhong Piao model in the previous embodiment, respectively carries out independent Zhong Piao control on N-1 standard clock signals to obtain N-1 paths of corrected clock signals with different clock characteristics, further provides the difference of noise seeds of each path, selects different random noise generation seeds for each path of independently controlled digital baseband signals to generate random incoherent noise interference, and can be programmed so as to further strengthen the uncorrelation among the output multichannel interference signals.
As shown in fig. 2, the application scenario of the incoherent multipath interference signal simulator of the present application is that the incoherent multipath interference signal simulator 1 outputs four paths of interference signals 4 through four interference antennas 3 arranged in a darkroom 5, and performs four incoming anti-interference tests on an anti-interference 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, multiplying the frequency of the original reference clock signal to a working frequency band and then dividing the power into N-1 reference clock signals;
s3, performing clock Zhong Piao self-adaptive adjustment according to a preset Zhong Piao model, respectively performing independent Zhong Piao control on N-1-reference clock signals to obtain N-1-path corrected clock signals with different clock characteristics, down-converting the N-1-path 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 Zhong Piao model is obtained by analyzing Zhong Piao change curves of different codes 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, finishing digital-to-analog conversion and generating corresponding N-1 paths of independently controlled analog intermediate frequency signals;
s6, according to the N-1 paths of corrected clock signals and the corresponding N-1 paths of independently controlled analog intermediate frequency signals, signal up-conversion is completed, and corresponding N-1 paths of independent analog radio frequency signals are generated.
Compared with the prior art, the incoherent multipath interference signal simulation method of the embodiment has the following advantages:
(1) Hardware volume reduction
The multi-channel in this embodiment adaptively adjusts the clock Zhong Piao according to a preset Zhong Piao model, and independently Zhong Piao controls the clock signal of the N-1 standard respectively, so that no additional hardware is required, and the hardware volume is not increased. Compared with the prior art, the method of adding an interference source along with each channel saves N-1 DACs, radio frequency channels, FPGA baseband signals, generates a board card and the like, and greatly reduces the hardware volume.
(2) Cost reduction
The multi-channel in this embodiment adaptively adjusts the clock Zhong Piao according to a preset Zhong Piao model, and independently Zhong Piao controls the clock signal of the N-1 standard, so as not to increase the hardware cost. Compared with the prior art, the method of adding the interference source along with each channel saves the cost generated by hardware configuration such as a board card generated by N-1 DAC, a radio frequency channel and FPGA baseband signals.
(3) Multiple incoherent interference patterns are added
The working states of the crystal oscillators of various interference devices can be simulated, so that each channel of interference signals not only have different phases, but also have different frequencies, various incoherent interference patterns which can be set are increased, and the blank of the part of the test meters in the market is filled.
(4) Multiple incoherent interference signals have high simulation degree
The preset Zhong Piao model in this embodiment is obtained by analyzing Zhong Piao change curves of different encoded in-orbit satellites of the existing satellite navigation system, so that the preset Zhong Piao model has high correlation with Zhong Piao change (phase, frequency and frequency drift) curves of the in-orbit satellites, so that the generated incoherent multipath interference signals are higher in authenticity, and the accuracy and reliability of the whole 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, carrying out clock Zhong Piao deduction according to a preset Zhong Piao model to generate N-1 Zhong Piao correction values, wherein each clock drift correction value comprises a phase correction value and a frequency correction value, and the preset Zhong Piao model is obtained by analyzing Zhong Piao change curves of different encoding in-orbit satellites of the existing satellite navigation system;
s32, modifying the phase value and the frequency value of the N-1 reference clock signal according to N-1 Zhong Piao correction values to obtain N-1 paths of corrected clock signals with different phase values and frequency values.
In this embodiment, when the clock Zhong Piao is adaptively adjusted according to the preset Zhong Piao model, and the N-1 reference clock signals are respectively controlled by the independent Zhong Piao, the clock Zhong Piao is deduced according to the preset Zhong Piao model, N-1 Zhong Piao correction values are generated, each clock drift correction value includes a phase correction value and a frequency correction value, then the phase value and the frequency value of the N-1 reference clock signals are modified according to the N-1 Zhong Piao correction values, so as to obtain N-1 corrected clock signals with different phase values and frequency values, and thus N-1 corrected clock signals with different phase values and frequency values are obtained, so that the problem that in the prior art, only the phases of N-1 interference reaching the antenna port of the receiver are different, the power of the co-directional interference signal is easily enhanced and the power of the reverse interference signal is easily reduced due to signal superposition, and the incoherence of each signal is ensured, and meanwhile, the preset Zhong Piao model has high correlation with the Zhong Piao variation (phase, frequency and frequency drift) curve of the on-orbit satellite, so that the generated incoherence interference signal is higher, and the reliability of the N-1 corrected clock signals is ensured to the reliability of the receiver.
As shown in fig. 5, in a preferred embodiment of the present application, the step S31 specifically includes the steps of:
s311, analyzing Zhong Piao change curves of different encoded on-orbit satellites of the existing satellite navigation system, wherein the Zhong Piao change curves comprise a phase parameter change curve of an on-orbit satellite-borne atomic clock Zhong Piao and a frequency parameter change curve of an on-orbit satellite-borne atomic clock Zhong Piao (see fig. 6-11);
s312, dividing the phase parameter change curves of the on-orbit satellite-borne atomic clocks Zhong Piao of the satellites in orbit and the frequency parameter change curves of the on-orbit satellite-borne atomic clocks Zhong Piao of the existing satellite navigation system into linear, full parabolic, semi-parabolic, step linear and broken line types according to curve change shapes to obtain corresponding Zhong Piao models, wherein the corresponding Zhong Piao models comprise Zhong Piao phase parameter change models and Zhong Piao frequency parameter change models;
s313, a Zhong Piao phase parameter change model and a Zhong Piao frequency parameter change model are randomly selected for each standard clock signal to carry out clock Zhong Piao deduction, and N-1 Zhong Piao correction values are generated, wherein each clock drift correction value comprises a phase correction value and a frequency correction value.
According to the method, when a preset Zhong Piao model is obtained according to analysis of Zhong Piao change curves of different encoded in-orbit satellites of an existing satellite navigation system, according to characteristics of a Zhong Piao phase parameter change curve and a Zhong Piao frequency parameter change curve of the in-orbit satellite atomic clock of the existing satellite navigation system, the model is classified into a plurality of typical linear types, namely a linear type, a full parabolic type, a semiparabolic type, a step linear type and a broken line type, the model can basically represent the Zhong Piao phase parameter change curve and the Zhong Piao frequency parameter change curve of the in-orbit satellite atomic clock of all the existing satellite navigation system according to the different encoded in-orbit satellites, so that as a simplification, the model Zhong Piao is obtained respectively according to various typical linear types of the model, the corresponding Zhong Piao model comprises a Zhong Piao phase parameter change model and a Zhong Piao frequency parameter change model, and a corresponding phase value and a frequency value can be deduced according to the corresponding model, on the basis, the model can be used for improving incoherence, the model can be randomly selected to calculate a phase value and a phase value of a signal by adopting a method of 3787, and a model can be deduced by adopting a method of randomly selecting a phase value to be a phase value of a signal to be a signal by 3787, and a phase value of a signal by a frequency value of a carrier signal to be obtained by a method, and a method of a phase value of a signal is different from a carrier signal by 3787, and a model is different from a carrier signal by a carrier signal by a method by a carrier signal by a carrier model.
Specifically, the Zhong Piao phase parameter variation model includes:
wherein phi is the phase value at the moment x;
the initial phase is preset or set by a user; k (k) 1 The phase change rate is preset or set by a user; x is the timestamp count; r is R x The chaos factor is obtained through a random function and randomly changes along with time; t (T) b1 As a first aging factor, increasing over time; phi (phi) 0 The phase value is the turning point moment; a, a 1 、b 1 、p 1 All are calculated curve control parameters; the step type is formed by combining a linear type and a parabolic type, and is provided with a step point, and when the step point is crossed, a one-time change model is switched to realize the step; the folding line type is formed by combining a plurality of line types and is provided with a folding point, and the change model is switched when the folding occurs.
Specifically, the Zhong Piao frequency parameter variation model includes:
wherein F is the frequency value at the moment x; f (f) 0 The initial frequency is preset or set by a user; k (k) 2 For frequency variationThe rate, preset or set by the user; x is the timestamp count; t (T) b2 Is a second aging factor, increasing over time; d, d 0 The frequency value at the moment of the turning point; a, a 2 、b 2 、p 2 All are calculated curve control parameters; the step type is formed by combining a linear type and a parabolic type, and is provided with a step point, and when the step point is crossed, a one-time change model is switched to realize the step; the folding line type is formed by combining a plurality of line types and is provided with a folding point, and a change model is switched when the folding occurs;
wherein D (x) is used for describing the drift of frequency generated with time in a Zhong Piao variation model, and is represented by a gaussian model and a random function, wherein the gaussian model is Zhong Piao affected by additive noise of a transmission channel of a hardware device in an atomic clock, the random function is a chaos factor which is difficult to predict, and the mathematical expression of D (x) is as follows:
D(x)＝P(x)+R x
p (x) is a Gaussian distribution and can be expressed as N (μ, σ) 2 ) Its one-dimensional probability density can be expressed as:
wherein μ is the mean value of the Gaussian distribution, σ 2 Is the variance of the gaussian distribution;
R x as a random function:
R x ＝Rand(l L ，l H )；
above l L ,l H The upper and lower bounds of the random field, respectively.
In the preferred embodiment of the present application, the scrambling types are interference to wideband, narrowband BPSK and QPSK modulated signals, and when generating corresponding N-1 paths of independently controlled digital baseband signals according to the N-1 paths of modified clock signals in step S4, different spreading codes are selected for each path of independently controlled digital baseband signals.
Aiming at the interference of broadband, narrowband BPSK and QPSK modulation signals, the clock Zhong Piao is adaptively adjusted according to a preset Zhong Piao model in the embodiment, the N-1 standard clock signals are respectively and independently Zhong Piao controlled to obtain N-1 paths of corrected clock signals with different clock characteristics, the difference of spreading codes of each path is further provided, different spreading codes are selected for each path of independently controlled digital baseband signal, and the digital baseband signal can be programmed, so that the irrelevance among the output multichannel interference signals is further enhanced.
In the preferred embodiment of the present application, if the plurality of scrambling types are noise interference, in step S4, when generating the corresponding N-1 paths of independently controlled digital baseband signals according to the N-1 paths of modified clock signals, different random noise generation seeds are selected for each path of independently controlled digital baseband signals to generate random incoherent noise interference.
Aiming at noise interference, the embodiment carries out clock Zhong Piao self-adaptive adjustment according to a preset Zhong Piao model in the previous embodiment, respectively carries out independent Zhong Piao control on N-1 standard clock signals to obtain N-1 paths of corrected clock signals with different clock characteristics, further provides the difference of noise seeds of each path, selects different random noise generation seeds for each path of independently controlled digital baseband signals to generate random incoherent noise interference, and can be programmed so as to further strengthen the uncorrelation among the output multichannel interference signals.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
Claims (10)
1. A non-coherent multipath interference signal simulator, comprising:
the clock generation module is used for generating an original reference clock signal, wherein the original reference clock signal is a 10MHz signal;
the clock characteristic simulation module is used for dividing the power of the original reference clock signal after frequency multiplication to the working frequency band into N-1 reference clock signals, carrying out clock Zhong Piao self-adaptive adjustment according to a preset Zhong Piao model, respectively carrying out independent Zhong Piao control on the N-1 reference clock signals to obtain N-1 paths of corrected clock signals with different clock characteristics, and 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 a phase value and a frequency value, and the preset Zhong Piao model is obtained according to Zhong Piao change curve analysis of different codes 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 according to the N-1 paths of modified 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;
the radio frequency module is used for 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 independently controlled analog intermediate frequency signals.
2. The incoherent multipath interference signal simulator of claim 1, wherein the digital baseband signal generation module is further configured to:
the interference of the various scrambling types to the BPSK and QPSK modulated signals of the broadband and the narrowband is that 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 spreading codes are selected for each path of independently controlled digital baseband signals.
3. The incoherent multipath interference signal simulator of claim 1, wherein the digital baseband signal generation module is further configured to:
the noise interference is generated by selecting different random noise generation seeds for each path of independently controlled digital baseband signal when the corresponding N-1 path of independently controlled digital baseband signal is generated according to the N-1 path of corrected clock signal.
4. The incoherent multipath interference signal simulating method is characterized by comprising the following steps:
s1, generating an original reference clock signal, wherein the original reference clock signal is a 10MHz signal;
s2, multiplying the frequency of the original reference clock signal to a working frequency band and then dividing the power into N-1 reference clock signals;
s3, performing clock Zhong Piao self-adaptive adjustment according to a preset Zhong Piao model, respectively performing independent Zhong Piao control on N-1-reference clock signals to obtain N-1-path corrected clock signals with different clock characteristics, down-converting the N-1-path 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 Zhong Piao model is obtained by analyzing Zhong Piao change curves of different codes 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, finishing digital-to-analog conversion and generating corresponding N-1 paths of independently controlled analog intermediate frequency signals;
s6, according to the N-1 paths of corrected clock signals and the corresponding N-1 paths of independently controlled analog intermediate frequency signals, signal up-conversion is completed, and corresponding N-1 paths of independent analog radio frequency signals are generated.
5. The method for simulating incoherent multipath interference signal according to claim 4, wherein said step S3 specifically comprises the steps of:
s31, carrying out clock Zhong Piao deduction according to a preset Zhong Piao model to generate N-1 Zhong Piao correction values, wherein each clock drift correction value comprises a phase correction value and a frequency correction value, and the preset Zhong Piao model is obtained by analyzing Zhong Piao change curves of different encoding in-orbit satellites of the existing satellite navigation system;
s32, modifying the phase value and the frequency value of the N-1 reference clock signal according to N-1 Zhong Piao correction values to obtain N-1 paths of corrected clock signals with different phase values and frequency values.
6. The method for simulating incoherent multipath interference signal according to claim 5, wherein said step S31 specifically includes the steps of:
s311, analyzing Zhong Piao change curves of different encoded on-orbit satellites of the existing satellite navigation system, wherein the Zhong Piao change curves comprise a phase parameter change curve of an on-orbit satellite-borne atomic clock Zhong Piao and a frequency parameter change curve of the on-orbit satellite-borne atomic clock Zhong Piao;
s312, dividing the phase parameter change curves of the on-orbit satellite-borne atomic clocks Zhong Piao of the satellites in orbit and the frequency parameter change curves of the on-orbit satellite-borne atomic clocks Zhong Piao of the existing satellite navigation system into linear, full parabolic, semi-parabolic, step linear and broken line types according to curve change shapes to obtain corresponding Zhong Piao models, wherein the corresponding Zhong Piao models comprise Zhong Piao phase parameter change models and Zhong Piao frequency parameter change models;
s313, a Zhong Piao phase parameter change model and a Zhong Piao frequency parameter change model are randomly selected for each standard clock signal to carry out clock Zhong Piao deduction, and N-1 Zhong Piao correction values are generated, wherein each clock drift correction value comprises a phase correction value and a frequency correction value.
7. The method of claim 6, wherein the Zhong Piao phase parameter variation model comprises:
wherein phi is the phase value at the moment x;
the initial phase is preset or set by a user; k (k) 1 The phase change rate is preset or set by a user; x is the timestamp count; r is R x For chaos factor obtained by random function, random is carried out with timeA change; t (T) b1 As a first aging factor, increasing over time; phi (phi) 0 The phase value is the turning point moment; a, a 1 、b 1 、p 1 All are calculated curve control parameters; the step type is formed by combining a linear type and a parabolic type, and is provided with a step point, and when the step point is crossed, a one-time change model is switched to realize the step; the folding line type is formed by combining a plurality of line types and is provided with a folding point, and the change model is switched when the folding occurs.
8. The method of claim 6, wherein the Zhong Piao frequency parameter variation model comprises:
wherein F is the frequency value at the moment x; f (f) 0 The initial frequency is preset or set by a user; k (k) 2 The frequency change rate is preset or set by a user; x is the timestamp count; t (T) b2 Is a second aging factor, increasing over time; d, d 0 The frequency value at the moment of the turning point; a, a 2 、b 2 、p 2 All are calculated curve control parameters; the step type is formed by combining a linear type and a parabolic type, and is provided with a step point, and when the step point is crossed, a one-time change model is switched to realize the step; the folding line type is formed by combining a plurality of line types and is provided with a folding point, and a change model is switched when the folding occurs;
wherein D (x) is used for describing the drift of frequency generated with time in a Zhong Piao variation model, and is represented by a gaussian model and a random function, wherein the gaussian model is Zhong Piao affected by additive noise of a transmission channel of a hardware device in an atomic clock, the random function is a chaos factor which is difficult to predict, and the mathematical expression of D (x) is as follows:
D(x)＝P(x)+R x
p (x) is a Gaussian distribution and can be expressed as N (μ, σ) 2 ) Its one-dimensional probability density can be expressed as:
wherein μ is the mean value of the Gaussian distribution, σ 2 Is the variance of the gaussian distribution;
R x as a random function:
R x ＝Rand(l L ，l H )；
above l L ,l H The upper and lower bounds of the random field, respectively.
9. The method for modeling incoherent multipath interference signal of claim 4, wherein:
if the scrambling types are the interference to the 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 path of independently controlled digital baseband signal is generated according to the N-1 path of corrected clock signal in step S4.
10. The method for modeling incoherent multipath interference signal of claim 4, wherein: and (4) when the plurality of interference types are noise interference, generating corresponding N-1 paths of independently controlled digital baseband signals according to the N-1 paths of corrected clock signals in the step (S4), and selecting different random noise generation seeds for each path of independently controlled digital baseband signals to generate random incoherent noise interference.
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