CN101603831A - A kind of pulsar signal simulator - Google Patents
A kind of pulsar signal simulator Download PDFInfo
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- CN101603831A CN101603831A CNA2009100233833A CN200910023383A CN101603831A CN 101603831 A CN101603831 A CN 101603831A CN A2009100233833 A CNA2009100233833 A CN A2009100233833A CN 200910023383 A CN200910023383 A CN 200910023383A CN 101603831 A CN101603831 A CN 101603831A
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Abstract
The invention discloses a kind of pulsar signal simulator, mainly solve present X ray pulsar signal and can only carry the problem that X-ray detector obtains via satellite.This system mainly comprises pulsar analog computer, Data Receiving buffer board, simulating signal output board.The simulation of pulsar analog computer is according to user's input of human-computer interaction interface, extract the information in pulsar characteristic parameter storehouse and the satellite ephemeris storehouse, produce the pulsar data that receive in the satellite transit process, send to the Data Receiving buffer board by FPDP, the Data Receiving buffer board is put into buffer memory with the data that receive, send to the simulation output board when needing, the simulation output board is converted to simulating signal with the digital signal that receives, thereby simulation produces the X ray pulsar signal.The present invention can simulate the pulsar signal that receives in the satellite transit process, and is provided with flexibly, and is applied widely, is convenient to realize the checking of X ray pulsar navigation theoretical method and the research of engineering.
Description
Technical field
The invention belongs to the electronic circuit technology field, relate to signal simulator, particularly a kind of pulsar signal simulator is applicable to the checking of paired pulses star navigational system theoretical method and the research of engineering.
Technical background
2004, the chief Tony Tether of U.S. national defense advanced research projects agency reveals that in the academic conference that Univ Utah State holds the Tactical Technology Office of U.S. national defense advanced research projects agency is carried out " the independent navigation location of basic x-ray source " planning studies.X ray pulsar independent navigation is as a kind of new astronomical navigation method, and antijamming capability is strong, the reliability height, and wide coverage, the stationkeeping in day heart inertial system need not to provide ephemeris, has its own strategic significance and huge development potentiality.The X ray pulsar navigation has become the important research direction of deep space navigation field.
At present, the X ray pulsar navigation still is in theoretical research stage, needs a large amount of X ray pulsar observation signals to study.But earth atmosphere has opacity to X ray, therefore can't receive the X ray signal of pulsar radiation on ground, can only carry X-ray detector paired pulses star via satellite and observe.Spaceborne X-ray detector design difficulty is big, and the cost height is difficult in maintenance, and this has limited the checking of X ray pulsar navigation theoretical method and the research of engineering.
Summary of the invention
The objective of the invention is at spaceborne X-ray detector design difficulty big, the cost height, problem difficult in maintenance provides a kind of pulsar signal simulator, the pulsar signal that analog satellite receives is convenient to realize the checking of X ray pulsar navigation theoretical method and the research of engineering.
For achieving the above object, pulsar signal simulator provided by the invention comprises:
The pulsar analog computer, be used to simulate the pulsar data that the generation satellite receives, Monitoring Data receives the feedback information of buffer board, and the pulsar simulated data sent to the Data Receiving buffer board by FPDP, in this pulsar analog computer human-computer interaction interface is housed, the pulsar signal analogue unit, pulsar characteristic parameter storehouse and satellite ephemeris storehouse, the user is provided with the various parameters of pulsar signal simulator by human-computer interaction interface, the pulsar signal modeling algorithm is searched pulsar characteristic parameter storehouse and satellite ephemeris storehouse, the pulsar signal that receives in the analog satellite flight course according to these parameters;
The Data Receiving buffer board is used for the data that receive are put into buffer memory, and the feedback of status of buffer memory to the pulsar analog computer, is sent to the simulation output board with the data in the buffer memory when needed;
The simulation output board, the digital signal that is used for receiving is converted to simulating signal, and simulation produces pulsar signal.
Above-mentioned pulsar simulator, pulsar signal analogue unit wherein comprises:
TOA forecast model generation module is used for the forecast model from pulsar characteristic parameter storehouse extraction TOA, the waveform of the X ray pulsar signal that generation solar system barycenter receives;
The universal gravitation analog module is used for the influence of the relativistic effect paired pulses star signal of massive star bodies generations such as simulated solar, Jupiter;
The noise simulation module, be used for according to the pulsar in pulsar characteristic parameter storehouse to the noisiness of solar system barycenter travel path and the space X gamma ray background noisiness on this pulsar radiation direction, produce noise signal, and in the waveform of above-mentioned pulsar signal, add noise:
Its computation of pseudoranges module is used for calculating distance and this distance the projection on pulsar radiation direction of satellite current time apart from solar system barycenter according to satellite ephemeris and orbit perturbation;
The phase difference calculating module is used for the projection of distance on the pulsar radiation direction according to satellite and solar system barycenter, calculates the phase differential that pulsar arrives satellite and solar system barycenter;
Shift module is used for arriving according to pulsar the phase differential of satellite and solar system barycenter, and the pulsar waveform that the solar system barycenter of current time is received is shifted, and obtains the pulsar signal that the current time satellite receives.
Above-mentioned pulsar simulator, human-computer interaction interface wherein is used to allow star-like number of user's strobe pulse, satellite orbit, allows the user import from date, time and the simulating signal signal to noise ratio (S/N ratio) of satellite reference position, simulation.
Above-mentioned pulsar simulator, pulsar characteristic parameter storehouse wherein comprises the space X gamma ray background noisiness of distance, the noisiness in line speed, radiation direction, TOA forecast model, pile-up pulse skeleton pattern, pulsar signal and this pulsar direction of pulsar.
Above-mentioned pulsar simulator, satellite ephemeris storehouse wherein comprises the perturbation of satellite orbit data storehouse and satellite orbit.
Above-mentioned pulsar simulator, Data Receiving buffer board wherein, comprise data-in port, interface chip, fpga chip, fifo chip and parallel output terminal mouth, this interface chip receives the data on the data-in port, send it to fpga chip, fpga chip deposits the data of receiving in the fifo chip in, when the data accumulation in the fifo chip after a certain amount of, fpga chip is read data from FIFO, send by parallel port output.
Above-mentioned pulsar simulator, simulation output board wherein, comprise parallel input port, the CPLD chip, the high precision clock chip, clock driver chip, 5 analog-digital chips and 5 road analog signal output interfaces, this CPLD chip receives the data on the parallel input port, send it in 5 analog-digital chips, high precision clock is delivered to clock driver chip by the CPLD chip, produce 5 road high precision clocks, be connected to respectively on the change over clock pin of 5 analog-digital chips, 5 modulus conversion chips are converted to analog voltage signal with 12 position digital signals, send by 5 road analog signal output interfaces.
The present invention has following advantage:
1. the present invention has been owing to adopted the pulsar analog computer to come analog satellite around the earth pulsar data that receive in service, and the influence of the various perturbations in can the analog satellite operational process and the various disturbances in the pulsar radiative process are near actual signal.
2. the present invention be owing to can simulate the different pulsar signals that multiple not co-orbital satellite receives, and the parameters such as signal to noise ratio (S/N ratio) of zero-time, reference position and the simulating signal of simulation can be set, thereby this simulator flexible design, and is applied widely.
3. the present invention compares with spaceborne X-ray detector owing to adopt pulsar analog computer, Data Receiving buffer board and simulating signal output board to form simulation system, has and realizes simply the advantage that cost is low.
Description of drawings
Fig. 1 is a system architecture diagram of the present invention;
Fig. 2 is the structural representation of the pulsar analog computer among the present invention;
Fig. 3 is the pulsar signal analogue unit structural representation that moves in the pulsar analog computer among the present invention;
Fig. 4 is the Data Receiving buffer board structural representation among the present invention;
Fig. 5 is the simulation output board structural representation among the present invention.
Embodiment
As shown in Figure 1, the present invention includes pulsar analog computer, Data Receiving buffer board, simulation output board, wherein the simulation of pulsar analog computer produces the pulsar data that satellite receives, send to the Data Receiving buffer board by usb bus, but be not limited to usb bus, the Data Receiving buffer board is put into buffer memory with the data that receive, send to the simulation output board by 8 bit data bus and 1 signal clock when needing, the simulation output board is converted to simulating signal with the digital signal that receives, thereby produces pulsar signal.
As shown in Figure 2, human-computer interaction interface, pulsar signal analogue unit, pulsar characteristic parameter storehouse and satellite ephemeris storehouse are housed in the pulsar analog computer.Human-computer interaction interface is used to allow star-like number of user's strobe pulse, satellite orbit, allows the user import from date, time and the simulating signal signal to noise ratio (S/N ratio) of satellite reference position, simulation.The pulsar signal analogue unit is searched pulsar characteristic parameter storehouse and satellite ephemeris storehouse, the pulsar signal that receives in the analog satellite flight course according to the analog parameter that human-computer interaction interface is provided with.
Wherein, the model of pulsar comprises: J0030+0451, B0633+17, B1509-58, J0437-47, B1821-24, B0656+14, B0540-69, J2124-33, B1055-52, B1937+21, B0329+54, B1642-03, B0950+08 and B0740-28.The user can choose 5 pulsars wherein wantonly in human-computer interaction interface.The space X gamma ray background noisiness that has comprised distance, the noisiness in line speed, radiation direction, TOA forecast model, pile-up pulse skeleton pattern, pulsar signal and this pulsar direction of above-mentioned pulsar in the pulsar characteristic parameter database.
Satellite orbit comprises: high orbit satellite, medium earth orbit satellite and low-orbit satellite.The user chooses one wantonly in three kinds of tracks, and its orbit parameter is set.The orbital data and the perturbation of high, medium and low rail satellite have been comprised in the satellite ephemeris storehouse.
As shown in Figure 3, the pulsar signal analogue unit of operation comprises TOA forecast model generation module, universal gravitation analog module, noise simulation module, its computation of pseudoranges module, phase difference calculating module and shift module in the pulsar analog computer among the present invention.Wherein:
TOA forecast model generation module, at first from pulsar characteristic parameter database, extract the cycle and the pile-up pulse profile of this pulsar, utilize the length in cycle that the pile-up pulse profile is carried out periodic extension then, solar system barycenter receives thereby generate, and do not have noise pollution, do not receive the ideal pulse star signal of universal gravitation effects.
The universal gravitation analog module extracts the gravitational influence of massive star body paired pulses star radiation signals such as the sun, Jupiter, and revises above-mentioned ideal pulse star signal in view of the above from pulsar characteristic parameter storehouse.
The noise simulation module is extracted pulsar to the noisiness of solar system barycenter travel path and the space X gamma ray background noisiness on this pulsar radiation direction from pulsar characteristic parameter storehouse, generted noise, and add above-mentioned ideal pulse star signal.
Its computation of pseudoranges module is at first extracted the pulsar analog parameter that the user is provided with from user interface, extract the satellite almanac data in the satellite ephemeris storehouse in view of the above; Again according to the position of satellite, calculate the air line distance of satellite and solar system barycenter in solar system barycenter inertial coordinates system; From pulsar characteristic parameter storehouse, extract the radiation direction of pulsar then, and calculate the projection of above-mentioned distance on this radiation direction, be pseudorange.
The phase difference calculating module utilizes the projection of pseudorange on the pulsar radiation direction divided by pulsar signal velocity of propagation in a vacuum, draws the phase differential of the pulsar signal that satellite and solar system barycenter receive, in the present invention, and this speed location light velocity.
Shift module utilize the waveform of the pulsar signal that phase differential receives the solar system barycenter of having simulated to carry out shifting function, thereby simulation obtains the pulsar signal that satellite receives.
As shown in Figure 4, the Data Receiving buffer board comprises USB port, USB interface chip, fpga chip, fifo chip and parallel port.Wherein the USB interface chip adopts CY7C68013A, but is not limited to this chip.CY7C68013A receives the data that transmit on the usb bus, sends it to fpga chip.The FPAG chip adopts EP1C6Q240C8, but be not limited to this chip, the data that EP1C6Q240C8 sends the USB interface chip deposit in the fifo chip, when the data accumulation in the fifo chip after a certain amount of, fpga chip is read data from fifo chip, send by parallel port.Fifo chip adopts IDT72V3690, but is not limited to this chip.
As shown in Figure 5, the simulating signal output board comprises parallel port, CPLD chip, high precision clock chip, clock driver chip, 5 modulus conversion chips and 5 road analog signal output interfaces.Wherein the CPLD chip adopts EPM7128AE, but is not limited to this chip, and EPM7128AE receives the data on the parallel bus, and 5 road pulsar simulated datas that receive are sent to respectively in 5 modulus conversion chips by 12 bit data bus.The high precision clock chip adopts PTOC32246, output frequency is 10MHz, the skew in 0 ℃～70 ℃ scopes during with respect to 25 ℃≤± 0.01ppm, ageing rate≤± 0.0005ppm/ days, Allan variance≤± 5E-11/s, high accurate clock signal is sent to clock driver chip by CPLD.Clock driver chip adopts IDT74FCT3807, and when being not limited to this chip, IDT74FCT3807 produces 5 road high precision clocks, delivers to respectively on the change over clock pin of 5 modulus conversion chips.Modulus conversion chip adopts AD9742, but is not limited to this chip, and 5 AD9742 are according to high precision clock, and what receive is converted to aanalogvoltage with 12 bit data, sends by 5 road analog signal output interfaces.
Above-mentioned is example of the present invention, but is not limited to described example, and obviously anyone can carry out the modification of different modes under thought of the present invention, but these are all at the row of protection domain of the present invention.
Claims (7)
1, a kind of pulsar signal simulator comprises:
The pulsar analog computer, be used to simulate the pulsar data that the generation satellite receives, Monitoring Data receives the feedback information of buffer board, and the pulsar simulated data sent to the Data Receiving buffer board by FPDP, in this pulsar analog computer human-computer interaction interface is housed, the pulsar signal analogue unit, pulsar characteristic parameter storehouse and satellite ephemeris storehouse, the user is provided with the various parameters of pulsar signal simulator by human-computer interaction interface, the pulsar signal modeling algorithm is searched pulsar characteristic parameter storehouse and satellite ephemeris storehouse, the pulsar signal that receives in the analog satellite flight course according to these parameters;
The Data Receiving buffer board is used for the data that receive are put into buffer memory, and the feedback of status of buffer memory to the pulsar analog computer, is sent to the simulation output board with the data in the buffer memory when needed;
The simulation output board, the digital signal that is used for receiving is converted to simulating signal, and simulation produces pulsar signal.
2, pulsar signal simulator according to claim 1 is characterized in that: described pulsar signal analogue unit comprises:
TOA forecast model generation module is used for the forecast model from pulsar characteristic parameter storehouse extraction TOA, the waveform of the X ray pulsar signal that generation solar system barycenter receives;
The universal gravitation analog module is used for the influence of the relativistic effect paired pulses star signal of massive star bodies generations such as simulated solar, Jupiter;
The noise simulation module, be used for according to the pulsar in pulsar characteristic parameter storehouse to the noisiness of solar system barycenter travel path and the space X gamma ray background noisiness on this pulsar radiation direction, produce noise signal, and in the waveform of above-mentioned pulsar signal, add noise;
Its computation of pseudoranges module is used for calculating distance and this distance the projection on pulsar radiation direction of satellite current time apart from solar system barycenter according to satellite ephemeris and orbit perturbation;
The phase difference calculating module is used for the projection of distance on the pulsar radiation direction according to satellite and solar system barycenter, calculates the phase differential that pulsar arrives satellite and solar system barycenter;
Shift module is used for arriving according to pulsar the phase differential of satellite and solar system barycenter, and the pulsar waveform that the solar system barycenter of current time is received is shifted, and obtains the pulsar signal that the current time satellite receives.
3, X ray pulsar signal simulator according to claim 1, it is characterized in that: described human-computer interaction interface, be used to allow star-like number of user's strobe pulse, satellite orbit, allow the user import from date, time and the simulating signal signal to noise ratio (S/N ratio) of satellite reference position, simulation.
4, X ray pulsar signal simulator according to claim 1, it is characterized in that: described pulsar characteristic parameter storehouse comprises the space X gamma ray background noisiness of distance, the noisiness in line speed, radiation direction, TOA forecast model, pile-up pulse skeleton pattern, pulsar signal and this pulsar direction of pulsar.
5, X ray pulsar signal simulator according to claim 1 is characterized in that: described satellite ephemeris storehouse comprises the perturbation of satellite orbit data storehouse and satellite orbit.
6, X ray pulsar signal simulator according to claim 1, it is characterized in that: described Data Receiving buffer board, comprise data-in port, interface chip, fpga chip, fifo chip and parallel output terminal mouth, this interface chip receives the data on the data-in port, send it to fpga chip, fpga chip deposits the data of receiving in the fifo chip in, when the data accumulation in the fifo chip after a certain amount of, fpga chip is read data from FIFO, send by parallel port output.
7, X ray pulsar signal simulator according to claim 1, it is characterized in that: described simulation output board, comprise parallel input port, the CPLD chip, the high precision clock chip, clock driver chip, 5 analog-digital chips and 5 road analog signal output interfaces, this CPLD chip receives the data on the parallel input port, send it in 5 analog-digital chips, high precision clock is delivered to clock driver chip by the CPLD chip, produce 5 road high precision clocks, be connected to respectively on the change over clock pin of 5 analog-digital chips, 5 modulus conversion chips are converted to analog voltage signal with 12 position digital signals, send by 5 road analog signal output interfaces.
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Inventor after: Xu Luping Inventor after: Su Zhe Inventor after: Zhang Ping Inventor after: Xie Zhenhua Inventor before: Su Zhe Inventor before: Xu Luping Inventor before: Zhang Hua Inventor before: Xie Zhenhua |
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