CN111649764A - Pulsar signal simulation system and method with correlation characteristics - Google Patents
Pulsar signal simulation system and method with correlation characteristics Download PDFInfo
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Abstract
The invention discloses a pulsar signal simulation system and method with correlation characteristics, wherein the simulation method comprises the following steps: constructing a pulsar thermo-optic radiation module by utilizing a celestial body thermal radiation model and characteristics, simulating a pulsar thermo-optic correlation characteristic radiation signal, and obtaining the photon probability of thermo-optic radiation; selecting a pulsar to be simulated, and modulating photon probability of thermo-optic radiation by utilizing a periodically measured photon flow function of the pulsar to obtain modulation of a pulsar signal profile so as to realize the simulation of a pulsar periodic correlation radiation signal; and randomly distributing photon time sequences generated by simulating the pulsar radiation periodic correlation radiation signals into two channels to complete the simulation of the actually measured pulsar correlation signals of the spacecraft. The invention can generate the pulsar signal which has the correlation characteristic and high conformity and is suitable for multi-situation application.
Description
Technical Field
The invention relates to the technical field of signal simulation and signal processing, in particular to a pulsar signal simulation system and method with correlation characteristics.
Background
Pulsar is a kind of high-speed rotation and extremely stable neutron star of rotation cycle, is known as the most accurate astronomical clock in nature. The stable periodic signal can provide accurate navigation information for the spacecraft and the deep space probe. The pulsar signal can generate signal radiation in electromagnetic wave frequency bands such as radio, visible light, ultraviolet, X-ray and the like. The X-ray belongs to high-energy photons, so that the X-ray detector can be miniaturized, but the X-ray cannot penetrate through the dense atmosphere of the earth, and a spacecraft can only receive the X-ray in space, so that an X-ray pulsar signal simulation technology needs to be designed when pulsar navigation method research is carried out on the ground. When the angular position measurement research and the ground simulation of pulsar X-ray photon intensity correlation are carried out, the simulated signals do not only need to have the flow characteristics of pulsar, but also need to have correlation characteristics, and therefore new requirements are provided for the pulsar signal simulation method.
The existing X-ray pulsar signal simulation method is generally divided into semi-physical simulation and software simulation. In the semi-physical simulation, the mechanical modulation method that an optical chopper is driven by a motor is mostly adopted to simulate an X-ray pulsar signal, and the signal is used for time delay measurement and navigation algorithm verification. Zhengwei et al proposed a semi-physical simulation method and system of an X-ray pulsar dynamic signal, first loading the pulsar profile waveform and data into a computer, then calculating the pulsar period at equal time intervals by using spacecraft orbit parameters, pulsar parameters and observation duration parameters, and then controlling a digital-to-analog conversion controller to drive an X-ray generator to emit an X-ray signal by using a waveform simulation controller according to the period data; lissaiping et al proposed a dynamic pulsar signal simulation apparatus with multiple physical characteristics, which utilizes a profile data generation unit to generate pulse profile data with multiple physical characteristics, converts the pulse profile data into a voltage signal through a signal output unit, and then controls an electrically controlled linear light source to generate a radiation intensity and a profile voltage signalThe proportional optical signal is attenuated into a single photon flow by the optical attenuator, and finally the photomultiplier converts the single photon flow into an electric pulse signal and outputs the electric pulse signal to the electronic reading unit for time marking and outputs the photon arrival time data to the system verification unit; huhuijun et al provide an X-ray pulsar signal simulation source based on a random single photon emission mechanism, generate a random number inverse function to realize generation of pulsar photon reaching time data and loading of a space on-orbit dynamic effect and a large-scale space-time effect, adopt a high-stability time-frequency comprehensive system, and have a pulse period stability of 10-13And in the magnitude, the X-ray generator is excited by light to realize the simulation of the X-ray pulsar radiation signal.
The method for software simulation of X-ray pulsar signals in the prior art comprises the following steps: sun Hai Peak et al have proposed a kind of X-ray pulse pair of stars photon sequence simulation method, the simulation has produced the photon sequence of pulse pair of stars radiation at the spacecraft, including spacecraft motion characteristic, relativistic effect, expand the simulation of the traditional single pulsar to the simulation of pulse pair of stars, has strengthened the analog capability of the pulsar navigation ground verification system; fourier and others propose a high-precision X-ray pulsar signal simulation method, photon phase is obtained through calculation according to a pulsar phase prediction model, then an inverse function method is utilized to obtain the phase of the next photon in a recursion mode, the phase is substituted into the pulsar phase prediction model to obtain an equation, and the equation is solved to obtain the arrival time of the next photon until the simulation process is finished; zhanghua et al propose a fast simulation method of cyclostationary Poisson signals and a hardware system thereof, which utilize Gaussian model fitting to decompose Poisson signal standard accumulation profiles into sub-Gaussian component profile curves, generate photon sequences through the sub-Gaussian component profiles, introduce a Poisson model to control the signal flow intensity of the photon sequences, and then obtain fitting profiles through the synthesis of all the sub-component sequences.
However, the above methods do not consider the coincidence characteristic of the pulsar signal, and the signal obtained by simulation is only a single channel signal of a single detector, and cannot meet the signal requirement of a high-precision pulsar angular position measurement ground simulation system. The Caoyang et al proposed a pulsar X-ray simulation source with radiation coherence, which employs a physical emission source capable of generating X-rays with high-conformity radiation energy spectrum and pulse period, but in practical study, the physical emission source cannot meet experimental data requirements.
Therefore, there is a need for a method for simulating a pulsar signal, which can generate a pulsar signal having correlation properties, high conformity, and suitability for multi-scenario applications.
Disclosure of Invention
The invention aims to provide a pulsar signal simulation system and method with correlation characteristics, which are used for solving the problems that only single-channel pulsar signals are obtained in X-ray pulsar navigation research in the prior art and correlation among multi-channel signals is not considered, and pulsar signals with correlation characteristics, high conformity and suitability for multi-situation application can be generated
In order to achieve the purpose, the invention provides the following scheme: the invention provides a pulsar signal simulation method with correlation characteristics, which comprises the following steps:
constructing a pulsar thermo-optic radiation module by utilizing a celestial body thermal radiation model and characteristics, simulating a pulsar thermo-optic correlation characteristic radiation signal, and obtaining the photon probability of thermo-optic radiation;
selecting a pulsar to be simulated, and modulating photon probability of thermo-optic radiation by utilizing a periodically measured photon flow function of the pulsar to obtain modulation of a pulsar signal profile so as to realize the simulation of a pulsar periodic correlation radiation signal;
and randomly distributing photon time sequences generated by simulating the pulsar radiation periodic correlation radiation signals into two channels to complete the simulation of the actually measured pulsar correlation signals of the spacecraft.
Preferably, the specific steps of simulating the radiation signal with the pulsar thermo-optic correlation characteristic include:
the input simulation duration parameter T and the timing precision parameter T generate a group of arrays with the length of T/T;
taking a random number for each unit of the array to obtain a random number sequence which is marked as Rand;
calculating the electric field intensity e ^2 pi jRand of the pulsar analog signal;
and carrying out Fourier transform and modulus on the electric field intensity to obtain a radiation signal with the pulsar thermo-optic correlation characteristic, and recording the radiation signal as the photon probability of thermo-optic radiation.
Preferably, the specific steps of modulation of the pulsar analog signal profile include:
selecting pulsar to be simulated, and acquiring photon flow of pulsar signals per picosecond by using a periodically measured photon flow function of the pulsar;
multiplying the photon flow of the pulsar signal per picosecond by the minimum time unit picosecond, and converting to obtain the existence probability of photons per picosecond;
and correspondingly multiplying the existence probability of photons per picosecond with the photon probability of the heat light radiation of the pulsar to obtain the modulated photon probability, thereby completing the modulation of the pulsar analog signal outline.
Preferably, the specific steps of the simulation of the measured pulsar-associated signal of the spacecraft include:
generating random numbers which have the same length as the photon probability after modulation and are uniformly distributed between 0 and 1;
comparing the modulated photon probability with the corresponding random number, if the modulated photon probability is greater than the random number corresponding to the modulated photon probability, indicating that photons are generated and recording the time of generating the photons;
and comparing the random number corresponding to the photon generation position with 0.5, and randomly distributing the photon generation time to two channels according to the comparison result to complete the simulation of the actually measured pulsar-related signal of the spacecraft.
The invention also provides a pulsar signal simulation system with correlation characteristics, comprising: the system comprises a pulsar thermo-optic radiation module, a pulsar contour modulation module and a photon generation and dual-channel signal distribution module; the pulsar thermo-optic radiation module, the pulsar contour modulation module and the photon generation and dual-channel signal distribution module are sequentially connected;
the pulsar thermo-optic radiation module simulates a pulsar thermo-optic correlation characteristic radiation signal by utilizing a celestial body thermal radiation model and characteristics to obtain photon probability of thermo-optic radiation;
the pulsar contour modulation module selects pulsars to be simulated, and modulates photon probability of thermo-optic radiation by utilizing a periodically measured photon flow function of the pulsars to obtain modulation of pulsar signal contours and realize pulsar periodic correlation radiation signal simulation.
The photon generation and dual-channel signal distribution module randomly distributes photon time sequences generated by the simulation of the pulsar periodic radiation related radiation signals to the dual channels to complete the simulation of the actually measured pulsar related signals of the spacecraft.
The invention discloses the following technical effects:
(1) different from other software simulation methods utilizing a Poisson distribution model and an index model, the invention innovatively simulates the heat and light radiation of the pulsar to obtain the correlation characteristic of the signal, and then modulates the heat and light radiation of the pulsar by utilizing the prior observation information of a simulated object, so that the simulation of the pulsar signal with the correlation characteristic can be realized, and the simulated pulsar signal can be used for a ground simulation system for measuring the high-precision angle position of the pulsar;
(2) the probability of whether photons are received every picosecond after the simulation starting time is calculated, and the photons received at the moment are determined and the time is recorded by comparing the probability with the random number, so that the radiation situation of the actual pulsar is better simulated compared with other software simulation algorithms; the pulsar modulation process by utilizing the pulsar time-varying flow function contains the characteristic of slow change of the rotation frequency of the pulsar, and accords with the actual observation condition;
(3) the pulsar profile modulation module modulates the pulsar thermo-optic correlation characteristic radiation signal by selecting the flow information of different pulsars, thereby realizing the simulation of different pulsars signals, meeting the simulation of various pulsars signals in an actual simulation system and being suitable for application in various situations;
(4) the software simulation method has the advantages of lower cost and more flexible noise addition and parameter adjustment; meanwhile, the practical receiving flow of the pulsar is small, so that the software simulation method can obtain long-time observation data more quickly so as to meet the data requirement of the ground simulation system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a block diagram of a pulsar signal simulation system having associated features according to the present invention;
FIG. 2 is a flow chart of the operation of the pulsar thermo-optic radiation module of the present invention;
FIG. 3 is a flow chart of the operation of the photon generation and dual channel signal distribution module of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1 to 3, the present embodiment provides a pulsar signal simulation method with correlation characteristics, which specifically includes the following steps:
s1, constructing a pulsar thermo-optic radiation module by utilizing a celestial body thermal radiation model and characteristics, and simulating a pulsar thermo-optic correlation characteristic radiation signal to obtain the photon probability of thermo-optic radiation;
the method specifically comprises the following steps:
s11, inputting a simulation duration parameter T and a timing precision parameter T;
s12, generating a group of arrays with the length of T/T;
s13, taking a random number for each unit of the array to obtain a random number sequence which is marked as Rand;
s14, calculating the electric field intensity e ^2 pi jRand of the pulsar analog signal;
and S15, carrying out Fourier transform and modulus on the electric field intensity to obtain a pulsar thermo-optic correlation characteristic radiation signal, and recording the pulsar thermo-optic correlation characteristic radiation signal as the photon probability of thermo-optic radiation in the pulsar signal simulation process.
S2, selecting a pulsar to be simulated, modulating photon probability of thermo-optic radiation by utilizing a periodically measured photon flow function of the pulsar to obtain modulation of a pulsar signal profile, and realizing pulsar periodic correlation radiation signal simulation;
the method specifically comprises the following steps:
s21, selecting pulsar to be simulated, and acquiring photon flow of pulsar signals per picosecond by using a periodically measured photon flow function of the pulsar;
s22, multiplying the photon flow of the pulsar signal per picosecond by the minimum time unit picosecond, and converting to obtain the existence probability of photons per picosecond;
s23, correspondingly multiplying the existence probability of photons per picosecond with the photon probability of the pulsar thermo-optic radiation to obtain the modulated photon probability, and completing the modulation of the pulsar analog signal outline.
S3, in order to simulate the actually measured pulsar radiated photon arrival time signal of the on-orbit spacecraft, randomly distributing a photon time sequence generated by simulating the pulsar radiated periodic correlation radiation signal into two channels to complete the simulation of the actually measured pulsar correlation signal of the spacecraft;
the method specifically comprises the following steps:
s31, generating random numbers which have the same length as the photon probability after modulation and are uniformly distributed between 0 and 1;
s32, comparing the modulated photon probability with the corresponding random number, if the modulated photon probability is larger than the random number corresponding to the modulated photon probability, indicating that photons are generated and recording the time of generating the photons;
and S33, comparing the random number corresponding to the photon generation position with 0.5, and randomly distributing the photon generation time to two channels according to the comparison result to complete the simulation of the actually measured pulsar-related signal of the spacecraft.
The present embodiment also provides a system for implementing a pulsar signal simulation method having an associated characteristic, including: the system comprises a pulsar thermo-optic radiation module, a pulsar contour modulation module and a photon generation and dual-channel signal distribution module; the pulsar thermal-optical radiation module, the pulsar contour modulation module and the photon generation and dual-channel signal distribution module are sequentially connected.
The pulsar thermo-optic radiation module is a source for simulating the correlation characteristic of pulsar signals and is used for correlation imaging, and the principle is as follows: the dynamic speckle formed by irradiating the rotating ground glass with the laser is used as a thermal light field, has the statistical property of a true thermal light field, and simultaneously solves the problems that the coherence time of a general thermal light source is extremely short and the number of photons in each coherent cell is small. The pulsar thermo-optic radiation module simulates pulsar thermo-optic radiation by utilizing the principle that the fluctuation of the square of a finite time Fourier transform mode of a sample function in any random process in a frequency domain has the same first-order statistics as speckle, obtains a pulsar thermo-optic correlation characteristic radiation signal, records the probability of photons of the thermo-optic radiation as the pulsar thermo-optic correlation characteristic radiation signal, and outputs the pulsar thermo-optic correlation characteristic radiation signal to the pulsar contour modulation module, wherein the specific simulation process is shown in fig. 2 and comprises the following steps:
1) inputting a simulation duration parameter T and a timing precision parameter T;
2) generating a group of arrays with the length of T/T;
3) taking a random number for each unit of the array to obtain a random number sequence which is marked as Rand;
4) calculating the electric field intensity e ^2 pi jRand of the pulsar analog signal;
5) and carrying out Fourier transform and modulus on the electric field intensity to obtain a radiation signal with the heat and light correlation characteristics of the pulsar, recording the radiation signal as the photon probability of heat and light radiation in the simulation process of the pulsar signal, and outputting the radiation signal to the pulsar contour modulation module.
The pulsar contour modulation module obtains the photon flow of the pulsar signal per picosecond according to the periodically measured photon flow function of the pulsar at the solar system centroid, and then multiplies the photon flow of the pulsar signal per picosecond by the minimum time unit picosecond to obtain the existence probability of photons through conversion; and multiplying the existence probability of the photons by the initial photon probability output by the pulsar thermo-optic radiation module to obtain the photon probability modulated in the pulsar signal simulation process, and outputting the modulated photon probability to the photon generation and dual-channel signal distribution module. The radiation signals with the pulsar thermo-optic correlation characteristics are modulated by selecting the photon flow of different pulsar radiations, so that the simulation of different pulsar signals can be realized, and different requirements in an actual simulation system can be met.
The photon generation and dual-channel signal distribution module adopts the idea similar to Monte Carlo, the modulated photon probability output by the pulsar contour modulation module is compared with the random number with equal length, and the random number is uniformly distributed between 0 and 1; judging whether photons are generated at present according to the comparison result and recording the time of the photon generation; comparing the random number corresponding to the photon generation position with 0.5, and randomly distributing the photon generation time to two channels according to the comparison result to complete the simulation of the actually measured pulsar-related signal of the spacecraft, as shown in fig. 3.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (5)
1. A pulsar signal simulation method with correlation characteristics is characterized by comprising the following steps:
constructing a pulsar thermo-optic radiation module by utilizing a celestial body thermal radiation model and characteristics, simulating a pulsar thermo-optic correlation characteristic radiation signal, and obtaining the photon probability of thermo-optic radiation;
selecting a pulsar to be simulated, and modulating photon probability of thermo-optic radiation by utilizing a periodically measured photon flow function of the pulsar to obtain modulation of a pulsar signal profile so as to realize the simulation of a pulsar periodic correlation radiation signal;
and randomly distributing photon time sequences generated by simulating the pulsar radiation periodic correlation radiation signals into two channels to complete the simulation of the actually measured pulsar correlation signals of the spacecraft.
2. The pulsar signal simulation method with correlation characteristics according to claim 1, wherein the specific step of simulating a pulsar thermo-optic correlation characteristic radiation signal comprises:
the input simulation duration parameter T and the timing precision parameter T generate a group of arrays with the length of T/T;
taking a random number for each unit of the array to obtain a random number sequence which is marked as Rand;
calculating the electric field intensity e ^2 pi jRand of the pulsar analog signal;
and carrying out Fourier transform and modulus on the electric field intensity to obtain a radiation signal with the pulsar thermo-optic correlation characteristic, and recording the radiation signal as the photon probability of thermo-optic radiation.
3. A method for pulsar signal simulation with correlation characteristics according to claim 1, wherein the specific steps of modulating the profile of the pulsar simulation signal comprise:
selecting pulsar to be simulated, and acquiring photon flow of pulsar signals per picosecond by using a periodically measured photon flow function of the pulsar;
multiplying the photon flow of the pulsar signal per picosecond by the minimum time unit picosecond, and converting to obtain the existence probability of photons per picosecond;
and correspondingly multiplying the existence probability of photons per picosecond with the photon probability of the heat light radiation of the pulsar to obtain the modulated photon probability, thereby completing the modulation of the pulsar analog signal outline.
4. The method for simulating a pulsar signal having correlation characteristics according to claim 1, wherein the specific step of simulating the actually measured pulsar correlation signal of the spacecraft comprises:
generating random numbers which have the same length as the photon probability after modulation and are uniformly distributed between 0 and 1;
comparing the modulated photon probability with the corresponding random number, if the modulated photon probability is greater than the random number corresponding to the modulated photon probability, indicating that photons are generated and recording the time of generating the photons;
and comparing the random number corresponding to the photon generation position with 0.5, and randomly distributing the photon generation time to two channels according to the comparison result to complete the simulation of the actually measured pulsar-related signal of the spacecraft.
5. A pulsar signal simulation system having an associated characteristic, comprising: the system comprises a pulsar thermo-optic radiation module, a pulsar contour modulation module and a photon generation and dual-channel signal distribution module; the pulsar thermo-optic radiation module, the pulsar contour modulation module and the photon generation and dual-channel signal distribution module are sequentially connected;
the pulsar thermo-optic radiation module simulates a pulsar thermo-optic correlation characteristic radiation signal by utilizing a celestial body thermal radiation model and characteristics to obtain photon probability of thermo-optic radiation;
the pulsar contour modulation module selects pulsars to be simulated, and modulates photon probability of thermo-optic radiation by utilizing a periodically measured photon flow function of the pulsars to obtain modulation of pulsar signal contours and realize pulsar periodic correlation radiation signal simulation.
The photon generation and dual-channel signal distribution module randomly distributes photon time sequences generated by the simulation of the pulsar periodic radiation related radiation signals to the dual channels to complete the simulation of the actually measured pulsar related signals of the spacecraft.
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