CN114200496A - Satellite signal simulation system and method capable of realizing real-time regeneration - Google Patents
Satellite signal simulation system and method capable of realizing real-time regeneration Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
- G01S19/45—Determining position by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement
- G01S19/46—Determining position by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement the supplementary measurement being of a radio-wave signal type
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/25—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS
- G01S19/256—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS relating to timing, e.g. time of week, code phase, timing offset
Abstract
The application is applicable to the field of navigation, and provides a satellite signal simulation system and method capable of realizing real-time regeneration. The system comprises a satellite signal acquisition and analysis module, a satellite signal simulation module, a D/A module, a radio frequency module, a transmitting module and a clock taming module; the satellite signal acquisition and analysis module acquires satellite signals, analyzes real-time satellite ephemeris information and positioning coordinates, and outputs a pulse per second signal; the satellite signal simulation module receives the second pulse signal, processes the second pulse signal to obtain clock taming data, and controls the clock taming module to finish clock taming according to the clock taming data; and according to the real-time satellite ephemeris information, completing the real-time simulation and time synchronization of the satellite signal under the current coordinate, and outputting a real-time regenerated digital satellite intermediate frequency signal. The method and the device can simulate real satellite signals under the current user coordinates in real time, and solve the problems of satellite signal coverage and satellite time service under the complex environment.
Description
Technical Field
The application belongs to the field of navigation, and particularly relates to a satellite signal simulation system and method capable of realizing real-time regeneration.
Background
With the continuous development of navigation positioning technology, a great amount of manpower and material resources are invested in each country to competitively develop an independent navigation satellite system, and the application of the navigation satellite system relates to military use and civil use and plays an important role in rescue, transportation, traffic management, information inquiry, positioning and the like. Currently, the world has four major Navigation and Positioning systems, namely, the Global Positioning System (GPS) in the united states, the BeiDou Navigation satellite System (BDS) in china, the GLONASS satellite System (GLONASS) in russia, and the Galileo satellite Navigation System (Galileo) in europe.
In practical application, when the number of visible satellites is small and the distribution of geometric figures of the satellites is poor due to the environments such as landforms, meteorological conditions and the like, the continuity and the positioning accuracy of the service are greatly reduced. In addition, satellite positioning has certain requirements on the selection of the elevation angle of the visible satellite, and poor positioning accuracy in the vertical direction can be caused when the elevation angle is too low, so that the horizontal positioning error is 2-3 times. In addition, the transmitting power of the satellite navigation signal is small, and the transmission distance exceeds ten thousand kilometers, so that the satellite navigation signal is easily interfered by other signals, and the acquisition failure of a receiver to the signal is caused. Therefore, a real-time and stable satellite signal source generating device is needed to realize satellite signal coverage and satellite time service in a complex environment (such as parking lot, tunnel and other environments).
Disclosure of Invention
The invention aims to provide a satellite signal simulation system and a satellite signal simulation method capable of regenerating in real time, and aims to solve the problems of satellite signal coverage and satellite time service in a complex environment.
In a first aspect, the present application provides a satellite signal simulation system capable of real-time regeneration, which includes a satellite signal acquisition and analysis module, a satellite signal simulation module, a D/a module, a radio frequency module, and a transmission module, which are electrically connected in sequence, and further includes a clock taming module electrically connected to the satellite signal simulation module; wherein the content of the first and second substances,
the satellite signal acquisition and analysis module is used for acquiring satellite signals, analyzing real-time satellite ephemeris information and positioning coordinates and outputting pulse per second signals;
the satellite signal simulation module is used for receiving the pulse per second signal, processing the pulse per second signal to obtain clock taming data, and controlling the clock taming module to finish clock taming according to the clock taming data; according to the real-time satellite ephemeris information, completing real-time simulation and time synchronization of satellite signals under the current coordinates, and outputting real-time regenerated digital satellite intermediate frequency signals;
the D/A module is used for completing the conversion from the digital satellite intermediate frequency signal to the analog satellite intermediate frequency signal;
the radio frequency module is used for up-converting the intermediate frequency signal of the simulation satellite into a real-time simulation satellite signal of a nominal frequency;
the transmitting module is used for transmitting real-time simulation satellite signals;
the clock disciplining module is used for receiving the clock disciplining data, finishing clock disciplining according to the clock disciplining data, finishing clock synchronization and providing a working clock for the system.
Furthermore, the satellite signal simulation system also comprises a power management module and a remote control module which is respectively connected with the satellite signal simulation module and the power management module; wherein the content of the first and second substances,
the power supply management module is used for receiving a control instruction of the remote control module, carrying out power-on and power-off management on a power supply of the system and realizing remote start and stop of the system;
the remote control module is used for controlling the starting and resetting of the system, and the switching and power control of the output of the analog satellite signal;
the satellite signal simulation module is also used for receiving the instruction of the remote control module and carrying out signal channel switch control and power regulation on the real-time regenerated digital satellite intermediate frequency signal.
In a second aspect, the present application provides a satellite signal simulation method capable of real-time regeneration, the satellite signal simulation method including:
the satellite signal acquisition and analysis module acquires satellite signals, analyzes real-time satellite ephemeris information and positioning coordinates, and outputs a pulse per second signal;
the satellite signal simulation module receives the second pulse signal, processes the second pulse signal to obtain clock taming data, and controls the clock taming module to finish clock taming according to the clock taming data;
after the clock taming is finished, the satellite signal simulation module finishes the real-time simulation and time synchronization of the satellite signal under the current coordinate according to the real-time satellite ephemeris information and outputs a real-time regenerated digital satellite intermediate frequency signal;
the D/A module completes the conversion from the digital satellite intermediate frequency signal to the analog satellite intermediate frequency signal;
the radio frequency module up-converts the simulation satellite intermediate frequency signal into a real-time simulation satellite signal of a nominal frequency;
the transmitting module transmits real-time analog satellite signals.
In the satellite signal simulation system capable of regenerating in real time, the satellite signal acquisition and analysis module acquires satellite signals, analyzes real-time satellite ephemeris information and positioning coordinates and outputs pulse per second signals; the satellite signal simulation module receives the second pulse signal, processes the second pulse signal to obtain clock taming data, and controls the clock taming module to finish clock taming according to the clock taming data; and according to the real-time satellite ephemeris information, completing the real-time simulation and time synchronization of the satellite signal under the current coordinate, and outputting a real-time regenerated digital satellite intermediate frequency signal. Therefore, real satellite signals under the current user coordinates can be simulated in real time, and the problems of satellite signal coverage and satellite time service under the complex environment are solved. And because the remote control module controls the power control of the analog satellite signal, the satellite signal analog module receives the instruction of the remote control module and controls the signal channel switch and adjusts the power of the real-time regenerated digital satellite intermediate frequency signal. Therefore, the power of the regenerated satellite signal can be adjusted in real time, and the coverage range of the signal can be adjusted. And because the power supply management module and the remote control module are included, the remote control function can be supported, and the working efficiency of the system is greatly improved.
Drawings
Fig. 1 is a block diagram illustrating a specific structure of a satellite signal simulation system capable of real-time regeneration according to an embodiment of the present disclosure.
Fig. 2 is a block diagram illustrating a specific structure of a satellite signal acquisition and analysis module in a satellite signal simulation system capable of real-time regeneration according to an embodiment of the present disclosure.
Fig. 3 is a block diagram illustrating a specific structure of a satellite signal simulation module in a satellite signal simulation system capable of real-time regeneration according to an embodiment of the present disclosure.
Fig. 4 is a block diagram illustrating an exemplary embodiment of a radio frequency module in a satellite signal simulation system capable of real-time regeneration.
FIG. 5 is a block diagram of a clock discipline module in a satellite signal simulation system capable of real-time regeneration according to an embodiment of the present application.
Fig. 6 is a specific block diagram of a remote control module in a satellite signal simulation system capable of real-time regeneration according to an embodiment of the present application.
Fig. 7 is a flowchart of a method for simulating a satellite signal capable of being reproduced in real time according to an embodiment of the present application.
Detailed Description
In order to make the purpose, technical solution and beneficial effects of the present application more clear and more obvious, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In order to explain the technical solution described in the present application, the following description will be given by way of specific examples.
Referring to fig. 1, a satellite signal simulation system capable of real-time regeneration according to an embodiment of the present disclosure includes a satellite signal acquisition and analysis module 11, a satellite signal simulation module 12, a D/a module 13, a radio frequency module 14, and a transmission module 15, which are electrically connected in sequence, and a clock discipline module 16 electrically connected to the satellite signal simulation module 12.
In an embodiment of the present application, the satellite signal simulation system may further include a power management module 17 and a remote control module 18 connected to the satellite signal simulation module 12 and the power management module 17, respectively.
The satellite signal acquisition and analysis module 11 is used for acquiring satellite signals, analyzing real-time satellite ephemeris information and positioning coordinates, and outputting pulse per second signals.
Referring to fig. 2, in an embodiment of the present application, the satellite signal acquisition and analysis module includes a time service receiver 111 and an ephemeris analysis module 112 electrically connected to the satellite signal simulation module, where the time service receiver 111 is further electrically connected to the ephemeris analysis module 112, and the time service receiver 111 is configured to obtain a positioning coordinate and time service information, transmit the positioning coordinate and the time service information to the ephemeris analysis module 112, and further obtain a second pulse signal, and transmit the second pulse signal to the satellite signal simulation module as a reference signal of a clock discipline algorithm; the ephemeris analysis module 112 is configured to process the positioning coordinates and the time service information obtained by the time service receiver 111 to obtain real-time satellite ephemeris information and positioning coordinates.
The satellite signal simulation module 12 is configured to receive the pulse per second signal, process the pulse per second signal to obtain clock taming data, and control the clock taming module to complete clock taming according to the clock taming data; and according to the real-time satellite ephemeris information, completing the real-time simulation and time synchronization of the satellite signal under the current coordinate, and outputting a real-time regenerated digital satellite intermediate frequency signal.
Referring to fig. 3, in an embodiment of the present application, the satellite signal simulation module 12 includes a DSP operation module 121 and an FPGA intermediate frequency signal generation module 122 that are electrically connected, where the DSP operation module 121 is electrically connected to an ephemeris analysis module of the satellite signal acquisition and analysis module, and is configured to receive real-time satellite ephemeris information and positioning coordinates in a current coordinate, set satellite signal simulation time as time of a current satellite according to the real-time satellite ephemeris information, calculate a satellite position and determine a visible satellite according to the positioning coordinates, then calculate initial data such as a carrier frequency control word, a pseudo code frequency control word, and a doppler shift, and write a text, and send the data to the FPGA intermediate frequency signal generation module 122; the FPGA intermediate frequency signal generating module 122 is electrically connected to the D/a module, and is configured to receive data, perform carrier generation, pseudo code generation, and text extraction, perform spread spectrum modulation and carrier modulation to obtain a real-time regenerated digital satellite intermediate frequency signal, and then perform switching and power adjustment on a signal channel according to a control instruction. In addition, the FPGA intermediate frequency signal generating module 122 is electrically connected to the time service receiver of the satellite signal collecting and analyzing module, receives the second pulse signal transmitted by the time service receiver as a reference signal of the clock discipline algorithm, measures the second pulse signal output by the time service receiver and the local second pulse signal generated inside the FPGA by using the time interval measurement quantum algorithm of the clock measurement algorithm, makes a difference between the two obtained time interval measurement values, looks up the difference value, queries a corresponding discipline data value, converts the difference value into an analog voltage by the potential control module of the clock discipline module, and applies the analog voltage to the constant temperature clock generating module, so as to change the output frequency of the voltage-controlled crystal oscillator, and performs iterative processing for many times, so that the second pulse error output by the local second pulse and the time service receiver is kept within a preset range (for example, 50ns), and then determines that the clock discipline is completed, real-time regeneration of satellite signals can be performed.
In an embodiment of the present application, data interaction may be performed between the DSP operation module 121 and the FPGA intermediate frequency signal generation module 122 through an EMIF interface.
The D/a module 13 is used for converting the digital satellite intermediate frequency signal into an analog satellite intermediate frequency signal.
The rf module 14 is used to up-convert the analog satellite if signal to a real-time analog satellite signal at a nominal frequency.
Referring to fig. 4, in an embodiment of the present application, the radio frequency module includes an analog intermediate frequency filter, a mixer, a radio frequency signal bandpass filter, a radio frequency signal amplifier, and a power controller, which are electrically connected in sequence, and further includes a main control chip, an internal adjustable local oscillator, and a local oscillator signal amplifier, which are electrically connected in sequence, where the main control chip is further electrically connected to the power controller, and the local oscillator signal amplifier is further electrically connected to the mixer. The analog intermediate frequency filter module is used for filtering other signals except the analog satellite intermediate frequency signal, so that only the intermediate frequency signal enters a post-stage circuit, the generation of adjacent channel interference is inhibited, and the selectivity of an adjacent channel is improved; the internal adjustable local oscillator is used for generating local oscillator signals with different frequencies; the local oscillator signal amplifier is used for amplifying the local oscillator signal; the frequency mixer is used for mixing the analog satellite intermediate-frequency signal and the local oscillator signal to realize up-conversion of the analog satellite intermediate-frequency signal and obtain an analog satellite signal with a nominal frequency; the radio frequency signal band-pass filter is used for filtering other signals except the analog satellite signal; the radio frequency signal amplifier is used for improving the transmitting power of the analog satellite signal and increasing the signal coverage; the power controller is used for integrally adjusting the output power of the analog satellite signal and adjusting the signal coverage range; the main control chip is used for configuring an internal adjustable local oscillator to generate local oscillator signals with different frequencies, receiving an instruction of the satellite signal simulation module, and sending a configuration command to the power controller to adjust the overall output power of the simulated satellite signals after processing.
The internal local oscillator of the radio frequency module is adjustable, parameter configuration is carried out on the internal local oscillator through a main control chip in the radio frequency module, different local oscillator frequencies can be obtained, and then after frequency mixing processing is carried out on the intermediate frequency signals and the local oscillator signals of the analog satellite by a frequency mixer in the radio frequency module, up-conversion processing from the intermediate frequency signals of the analog satellite to different frequency points can be achieved. Therefore, the radio frequency module is suitable for up-conversion processing of analog satellite signals with different nominal frequencies, and when the up-conversion processing of the analog satellite signals with a certain specific frequency is carried out, the frequency of the analog satellite intermediate frequency signals input into the radio frequency module is not limited to a certain fixed frequency point any more, namely when the frequency of the analog satellite intermediate frequency signals changes, the analog satellite intermediate frequency signals are still required to be converted to the satellite signals with the corresponding nominal frequency, and the satellite signals can be converted by adjusting local oscillators in the radio frequency, so that the radio frequency module has better applicability.
The transmitting module 15 is used for transmitting real-time analog satellite signals, and realizing coverage and time service of the satellite signals in a complex environment. In an embodiment of the present application, the transmitting module 15 may select a high gain antenna.
The clock disciplining module 16 is configured to receive the clock disciplining data, complete clock disciplining according to the clock disciplining data, complete clock synchronization, and provide a working clock for the system.
Referring to fig. 5, in an embodiment of the present application, the clock taming module 16 includes a potential control module 161, a constant temperature clock generating module 162, and a clock frequency dividing module 163, where the potential control module 161 is electrically connected to the clock generating module 162 and the satellite signal simulation module, respectively, the constant temperature clock generating module 162 is electrically connected to the clock frequency dividing module 163, and the clock frequency dividing module 163 is further electrically connected to the satellite signal simulation module, the D/a module, and the radio frequency module, respectively, where the potential control module 161 is configured to adjust an input voltage of the constant temperature clock generating module 162 according to clock taming data output by the satellite signal simulation module; the constant-temperature clock generation module 162 is used for adjusting the output clock frequency according to the input voltage; the clock frequency division module 163 is configured to divide and stabilize the frequency of the clock output by the constant temperature clock generation module 162, and provide a working clock for the DSP operation module, the FPGA intermediate frequency signal generation module, the D/a module, and the radio frequency module of the satellite signal simulation module.
The power management module 17 is used for receiving a control instruction of the remote control module, performing power-on and power-off management on a power supply of the system, realizing remote start and stop of the system, and greatly improving convenience of system operation.
The remote control module 18 is used to control the start, reset and switching of the analog satellite signal output of the system and power control.
Referring to fig. 6, in an embodiment of the present application, the remote control module includes an upper computer 181, a control module 182 electrically connected to the upper computer 181, and a controlled module 183 in wireless communication with the control module 182, where the upper computer 181 is configured to provide a visual operation interface, and perform a series of operation instructions such as system start, reset, signal channel switch, power control, and the like; the control module 182 is configured to perform framing, encoding, and other processing on the operation instruction according to the transmission protocol and immediately send the data to the controlled module 183; the controlled module 183 is configured to receive the data sent by the control module 182, analyze the data to obtain a control instruction, and send the control instruction to the corresponding satellite signal simulation module or the power management module.
In an embodiment of the present application, the satellite signal simulation module 12 may be further configured to receive an instruction from a remote control module, and perform signal channel switching control and power adjustment on the digital satellite intermediate frequency signal regenerated in real time.
Please refer to fig. 7, which is a flowchart illustrating a method for simulating a satellite signal capable of real-time regeneration according to an embodiment of the present application, wherein the method for simulating a satellite signal capable of real-time regeneration according to an embodiment of the present application includes the following steps:
s101, a satellite signal acquisition and analysis module acquires a satellite signal, analyzes real-time satellite ephemeris information and positioning coordinates, and outputs a pulse per second signal;
in an embodiment of the present application, before S101, the satellite signal simulation method further includes:
the remote control module controls the power management module to start or reset the system.
S102, the satellite signal simulation module receives the second pulse signal, processes the second pulse signal to obtain clock taming data, and controls the clock taming module to finish clock taming according to the clock taming data;
in an embodiment of the present application, S102 may specifically be:
the satellite signal simulation module receives a second pulse signal as a reference signal of a clock discipline algorithm, then a time interval measurement quantum algorithm of the clock measurement algorithm is used for respectively measuring the second pulse signal output by a time service receiver and a local second pulse signal generated in the FPGA, the obtained two time interval measurement values are subjected to difference, the obtained difference value is subjected to table lookup, a corresponding discipline data value is inquired, the result is converted into an analog voltage by a potential control module of the clock discipline module and then is applied to a constant temperature clock generation module, the output frequency of the voltage-controlled crystal oscillator is changed, iterative processing is carried out for multiple times, so that the second pulse error output by the local second pulse and the time service receiver is kept within a preset range, and the clock discipline is judged to be completed;
s103, after clock taming is finished, the satellite signal simulation module finishes real-time simulation and time synchronization of satellite signals under the current coordinate according to real-time satellite ephemeris information and outputs real-time regenerated digital satellite intermediate frequency signals;
s104, the D/A module completes the conversion from the digital satellite intermediate frequency signal to the analog satellite intermediate frequency signal;
s105, the radio frequency module up-converts the intermediate frequency signal of the simulation satellite into a real-time simulation satellite signal of a nominal frequency;
and S106, the transmitting module transmits the real-time simulation satellite signal.
In an embodiment of the application, after the transmitting module transmits the real-time analog satellite signal, the satellite signal simulation method may further include:
the remote control module controls the power management module to close the system;
the satellite signal simulation method may further include:
and the remote control module controls the satellite signal simulation module to control the signal channel switch and regulate the power of the real-time regenerated digital satellite intermediate frequency signal.
In the satellite signal simulation system capable of regenerating in real time, the satellite signal acquisition and analysis module acquires satellite signals, analyzes real-time satellite ephemeris information and positioning coordinates and outputs pulse per second signals; the satellite signal simulation module receives the second pulse signal, processes the second pulse signal to obtain clock taming data, and controls the clock taming module to finish clock taming according to the clock taming data; and according to the real-time satellite ephemeris information, completing the real-time simulation and time synchronization of the satellite signal under the current coordinate, and outputting a real-time regenerated digital satellite intermediate frequency signal. Therefore, real satellite signals under the current user coordinates can be simulated in real time, and the problems of satellite signal coverage and satellite time service under the complex environment are solved. And because the remote control module controls the power control of the analog satellite signal, the satellite signal analog module receives the instruction of the remote control module and controls the signal channel switch and adjusts the power of the real-time regenerated digital satellite intermediate frequency signal. Therefore, the power of the regenerated satellite signal can be adjusted in real time, and the coverage range of the signal can be adjusted. And because the power supply management module and the remote control module are included, the remote control function can be supported, and the working efficiency of the system is greatly improved.
It should be understood that the steps in the embodiments of the present application are not necessarily performed in the order indicated by the step numbers. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in various embodiments may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least some of the sub-steps or stages of other steps.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a non-volatile computer-readable storage medium, and can include the processes of the embodiments of the methods described above when the program is executed. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A satellite signal simulation system capable of regenerating in real time is characterized by comprising a satellite signal acquisition and analysis module, a satellite signal simulation module, a D/A module, a radio frequency module and a transmitting module which are electrically connected in sequence, wherein the satellite signal simulation system further comprises a clock taming module electrically connected with the satellite signal simulation module; wherein the content of the first and second substances,
the satellite signal acquisition and analysis module is used for acquiring satellite signals, analyzing real-time satellite ephemeris information and positioning coordinates and outputting pulse per second signals;
the satellite signal simulation module is used for receiving the pulse per second signal, processing the pulse per second signal to obtain clock taming data, and controlling the clock taming module to finish clock taming according to the clock taming data; according to the real-time satellite ephemeris information, completing real-time simulation and time synchronization of satellite signals under the current coordinates, and outputting real-time regenerated digital satellite intermediate frequency signals;
the D/A module is used for completing the conversion from the digital satellite intermediate frequency signal to the analog satellite intermediate frequency signal;
the radio frequency module is used for up-converting the intermediate frequency signal of the simulation satellite into a real-time simulation satellite signal of a nominal frequency;
the transmitting module is used for transmitting real-time simulation satellite signals;
the clock disciplining module is used for receiving the clock disciplining data, finishing clock disciplining according to the clock disciplining data, finishing clock synchronization and providing a working clock for the system.
2. The satellite signal simulation system of claim 1, further comprising a power management module and a remote control module connected to the satellite signal simulation module and the power management module, respectively; wherein the content of the first and second substances,
the power supply management module is used for receiving a control instruction of the remote control module, carrying out power-on and power-off management on a power supply of the system and realizing remote start and stop of the system;
the remote control module is used for controlling the starting and resetting of the system, and the switching and power control of the output of the analog satellite signal;
the satellite signal simulation module is also used for receiving the instruction of the remote control module and carrying out signal channel switch control and power regulation on the real-time regenerated digital satellite intermediate frequency signal.
3. The satellite signal simulation system according to claim 1 or 2, wherein the satellite signal acquisition and analysis module comprises a time service receiver and an ephemeris analysis module electrically connected to the satellite signal simulation module, the time service receiver is further electrically connected to the ephemeris analysis module, wherein,
the time service receiver is used for obtaining positioning coordinates and time service information, transmitting the positioning coordinates and the time service information to the ephemeris analysis module, and is also used for obtaining a pulse per second signal, and transmitting the pulse per second signal to the satellite signal simulation module as a reference signal of a clock discipline algorithm;
the ephemeris analysis module is used for processing the positioning coordinates and the time service information obtained by the time service receiver to obtain real-time satellite ephemeris information and positioning coordinates.
4. The satellite signal simulation system according to claim 3, wherein the satellite signal simulation module comprises a DSP operation module and an FPGA intermediate frequency signal generation module which are electrically connected, the DSP operation module is electrically connected with an ephemeris analysis module of the satellite signal acquisition and analysis module, the FPGA intermediate frequency signal generation module is electrically connected with a time service receiver of the satellite signal acquisition and analysis module, wherein,
the DSP operation module is used for receiving real-time satellite ephemeris information and positioning coordinates under the current coordinates, setting satellite signal simulation time as the time of the current satellite according to the real-time satellite ephemeris information, calculating the satellite position according to the positioning coordinates and judging visible satellites, then calculating initial data and compiling text, and sending the data to the FPGA intermediate frequency signal generation module;
the FPGA intermediate frequency signal generation module is electrically connected with the D/A module and used for receiving data, performing carrier generation, pseudo code generation and text extraction, then performing spread spectrum modulation and carrier modulation to obtain a real-time regenerated digital satellite intermediate frequency signal, and then switching and power adjustment are performed on a signal channel according to a control instruction; and the clock domestication module is also used for receiving a second pulse signal transmitted by a time service receiver of the satellite signal acquisition and analysis module as a reference signal of a clock domestication algorithm, then a time interval measurement quantum algorithm of the clock measurement algorithm is used for respectively measuring the second pulse signal output by the time service receiver and a local second pulse signal generated in the FPGA, the obtained two time interval measurement values are subjected to difference, the obtained difference value is subjected to table lookup, and a corresponding domestication data value is inquired.
5. The satellite signal simulation system of claim 4, wherein the DSP operation module and the FPGA intermediate frequency signal generation module perform data interaction through an EMIF interface.
6. The satellite signal simulation system of claim 4, wherein the clock taming module comprises a potential control module, a constant temperature clock generation module, and a clock division module, the potential control module being electrically connected to the clock generation module and the satellite signal simulation module, respectively, the constant temperature clock generation module being electrically connected to the clock division module, the clock division module being further electrically connected to the satellite signal simulation module, the D/A module, and the radio frequency module, respectively, wherein,
the potential control module is used for adjusting the input voltage of the constant-temperature clock generation module according to the clock taming data output by the satellite signal simulation module;
the constant-temperature clock generation module is used for adjusting the output clock frequency according to the input voltage;
the clock frequency division module is used for carrying out frequency division and frequency stabilization on the clock output by the constant-temperature clock generation module and providing a working clock for the DSP operation module, the FPGA intermediate-frequency signal generation module, the D/A module and the radio frequency module of the satellite signal simulation module.
7. The satellite signal simulation system of claim 1, wherein the remote control module comprises an upper computer and a control module electrically connected to the upper computer, and further comprising a controlled module wirelessly communicatively connected to the control module, wherein,
the upper computer is used for providing a visual operation interface and carrying out system starting, resetting, signal channel switching and power control operation instructions;
the control module is used for framing and coding the operation instruction according to the transmission protocol and immediately sending the data to the controlled module;
the controlled module is used for receiving the data sent by the control module, analyzing the data to obtain a control instruction, and sending the control instruction to the corresponding satellite signal simulation module or the power management module.
8. A method for simulating a satellite signal that can be reproduced in real time, the method comprising:
the satellite signal acquisition and analysis module acquires satellite signals, analyzes real-time satellite ephemeris information and positioning coordinates, and outputs a pulse per second signal;
the satellite signal simulation module receives the second pulse signal, processes the second pulse signal to obtain clock taming data, and controls the clock taming module to finish clock taming according to the clock taming data;
after clock taming is completed, the satellite signal simulation module completes real-time simulation and time synchronization of satellite signals under the current coordinate according to real-time satellite ephemeris information and outputs real-time regenerated digital satellite intermediate frequency signals;
the D/A module completes the conversion from the digital satellite intermediate frequency signal to the analog satellite intermediate frequency signal;
the radio frequency module up-converts the simulation satellite intermediate frequency signal into a real-time simulation satellite signal of a nominal frequency;
the transmitting module transmits real-time analog satellite signals.
9. The method for simulating a satellite signal according to claim 8, wherein the satellite signal simulation module receives the pulse-per-second signal, processes the pulse-per-second signal to obtain clock discipline data, and controls the clock discipline module according to the clock discipline data to perform clock discipline specifically:
the satellite signal simulation module receives the second pulse signal as a reference signal of a clock discipline algorithm, then the second pulse signal output by the time service receiver and a local second pulse signal generated in the FPGA are respectively measured by using a time interval measurement quantum algorithm of the clock measurement algorithm, then the difference value of the two obtained time interval measurement values is obtained, table lookup is carried out again, a corresponding discipline data value is inquired, then the result is converted into an analog voltage by a potential control module of the clock discipline module and then is applied to a constant temperature clock generation module, the output frequency of the voltage-controlled crystal oscillator is changed, iterative processing is carried out for multiple times, so that the error between the local second pulse and the second pulse output by the time service receiver is kept within a preset range, and then the clock discipline is judged to be completed.
10. The method for simulating satellite signals according to claim 8, wherein before the satellite signal acquisition and analysis module acquires the satellite signals and analyzes the real-time satellite ephemeris information and the positioning coordinates and outputs the pulse-per-second signal, the method for simulating satellite signals further comprises:
the remote control module controls the power management module to start or reset the system;
after the transmitting module transmits the real-time simulation satellite signal, the satellite signal simulation method further includes:
the remote control module controls the power management module to close the system;
the satellite signal simulation method further comprises:
and the remote control module controls the satellite signal simulation module to control the signal channel switch and regulate the power of the real-time regenerated digital satellite intermediate frequency signal.
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