CN113556147B - Navigation and navigation combined satellite navigation signal scrambling method, device and system - Google Patents
Navigation and navigation combined satellite navigation signal scrambling method, device and system Download PDFInfo
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- CN113556147B CN113556147B CN202110730420.5A CN202110730420A CN113556147B CN 113556147 B CN113556147 B CN 113556147B CN 202110730420 A CN202110730420 A CN 202110730420A CN 113556147 B CN113556147 B CN 113556147B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
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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
- G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
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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
- G01S19/30—Acquisition or tracking or demodulation of signals transmitted by the system code related
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/001—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using chaotic signals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Computer Security & Cryptography (AREA)
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Abstract
The invention discloses a method, a device and a system for scrambling a satellite navigation signal of a communication and conduction combination, wherein the method comprises a satellite sending stage and a user machine receiving stage, and the device comprises: the device comprises a first scrambling module 110, a navigation signal generating module, a communication signal generating module, a satellite signal transmitting module, a satellite signal receiving module, a communication signal processing module, a second scrambling module and a navigation signal processing module. The scrambling sequence is used for scrambling the satellite navigation signal, so that the safety and credibility of the civil satellite navigation signal are improved. And the scrambling parameters for generating the scrambling sequences are broadcasted through the communication signals, so that a user machine does not need to locally store a large number of scrambling sequences, local resources can be saved, meanwhile, the scrambling sequences can be updated in real time, and the safety and credibility of the civil satellite navigation signals are further improved.
Description
Technical Field
The invention relates to the field of satellite navigation positioning, in particular to a method, a device and a system for scrambling a satellite navigation signal of communication and navigation combination.
Background
In recent years, a satellite navigation system is developed vigorously, a satellite navigation signal system is continuously updated and advanced, but the requirements of part of application scenes on the safety and the credibility of navigation and positioning are higher and higher, such as automatic driving, unmanned aerial vehicles and the like, once being deceived, serious safety accidents can be caused. The existing civil satellite navigation signals are not subjected to safety protection measures, so that the civil satellite navigation signals are easy to cheat.
Satellite systems are being built around the world, mostly broadcasting communication signals and navigation signals simultaneously, which is not well utilized by the current satellite navigation systems.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a method, a device and a system for scrambling a communication-combined satellite navigation signal. The method can solve the problems that the existing civil satellite navigation signal is low in safety and credibility and is easy to be cheated.
According to an embodiment of the first aspect of the invention, the method for scrambling the combined conduction satellite navigation signal comprises the following steps:
a satellite transmission stage:
generating a scrambling sequence according to the scrambling parameters and generating a navigation message spread spectrum code;
generating a scrambled navigation signal according to the generated scrambling sequence, the navigation message spread spectrum code and the message bit information;
framing and modulating the scrambling parameters and other communication information together to obtain communication signals;
a sending end of the satellite jointly broadcasts the communication signal and the scrambled navigation signal;
receiving by the user machine;
the user machine receives the communication signal and the navigation signal transmitted by the satellite;
demodulating a communication signal to obtain a scrambling parameter, and generating a scrambling sequence according to the scrambling parameter;
and acquiring, tracking and demodulating the scrambled navigation signal according to the generated scrambling sequence and the navigation message spreading code.
The method for scrambling the satellite navigation signal of the conductance combination according to the embodiment of the first aspect of the invention has at least the following technical effects: according to the embodiment of the invention, the satellite navigation signals are scrambled through the scrambling sequence, so that the safety and credibility of the civil satellite navigation signals are improved. And the scrambling parameters for generating the scrambling sequences are broadcasted through the communication signals, so that a user machine does not need to locally store a large number of scrambling sequences, local resources can be saved, meanwhile, the scrambling sequences can be updated in real time, and the safety and credibility of the civil satellite navigation signals are further improved.
According to some embodiments of the invention, the scrambling sequence in the satellite transmission stage is selected from a Logistic chaotic sequence.
According to some embodiments of the present invention, the specific steps of demodulating the communication signal in the receiving stage of the user equipment to obtain the scrambling parameter and generating the scrambling sequence according to the scrambling parameter are as follows:
the user machine demodulates and demodulates the frame of the communication signal, extracts the scrambling parameter;
and obtaining a Logistic chaotic sequence which is the same as the satellite through Logistic mapping and is used as a scrambling sequence.
According to some embodiments of the present invention, the step of generating the scrambled navigation signal according to the generated scrambling sequence, the navigation message spreading code and the message bit information in the satellite transmission phase comprises:
firstly, generating original navigation message spread spectrum codes, scrambling the original navigation message spread spectrum codes by the scrambling sequence,
and then, carrying out spread spectrum modulation on the preset message bit information by using the scrambled navigation message spread spectrum code to obtain a scrambled navigation signal.
According to a second aspect of the invention, the apparatus for scrambling the combined satellite navigation signal comprises:
the first scrambling module is used for generating a scrambling sequence according to the scrambling parameter; the navigation signal generation module is connected with the first scrambling module and used for scrambling an original navigation message spread spectrum code according to a scrambling sequence and performing spread spectrum modulation on preset message bit information according to the scrambled navigation message spread spectrum code to obtain a navigation signal; the first scrambling module is connected with the communication signal generating module and is used for framing and modulating the scrambling parameters and other communication information together to obtain a communication signal; the satellite signal transmitting module is respectively connected with the communication signal generating module and the navigation signal generating module and is used for jointly broadcasting the communication signal and the navigation signal; the satellite signal receiving module is used for receiving the communication signal and the navigation signal which are broadcast by the satellite signal sending module; the communication signal processing module is connected with the satellite signal receiving module and is used for demodulating a communication signal to obtain a scrambling parameter; the second scrambling module is connected with the communication signal processing module and used for generating a scrambling sequence according to scrambling parameters; and the navigation signal processing module is respectively connected with the second scrambling module and the satellite signal receiving module and is used for capturing, tracking and demodulating the navigation signal according to the scrambling sequence.
The combined conduction satellite navigation signal scrambling device according to the second aspect of the invention has at least the following technical effects: according to the embodiment of the invention, the satellite navigation signals are scrambled through the scrambling sequence, so that the safety and credibility of the civil satellite navigation signals are improved. And the scrambling parameters for generating the scrambling sequences are broadcasted through the communication signals, so that a user machine does not need to locally store a large number of scrambling sequences, local resources can be saved, meanwhile, the scrambling sequences can be updated in real time, and the safety and credibility of the civil satellite navigation signals are further improved.
According to a third aspect of the present invention, a system for scrambling a combined navigation satellite signal is provided, comprising: the satellite is internally provided with the first scrambling module, the navigation signal generating module, the communication signal generating module and the satellite signal transmitting module; the user machine is internally provided with the satellite signal receiving module, the communication signal processing module, the second scrambling module and the navigation signal processing module.
The apparatus for scrambling a combined navigation satellite signal according to the third aspect of the present invention has at least the following technical effects: according to the embodiment of the invention, the scrambling sequence is used for scrambling the satellite navigation signal, so that a user can demodulate the satellite navigation signal by using the scrambling sequence broadcasted by the communication signal, and the safety and credibility of the civil satellite navigation signal are improved. And the scrambling parameters for generating the scrambling sequences are broadcasted through the communication signals, so that a user machine does not need to locally store a large number of scrambling sequences, local resources can be saved, meanwhile, the scrambling sequences can be updated in real time, and the safety and credibility of the civil satellite navigation signals are further improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a diagram of an application scenario in accordance with an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a method for scrambling satellite navigation signals of a channel combination according to an embodiment of the present invention;
FIG. 3 is a schematic block diagram of a satellite navigation signal scrambling apparatus for a combined channel estimation according to an embodiment of the present invention;
FIG. 4 is a schematic block diagram of a system for scrambling a satellite navigation signal with a combined channel in an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the invention, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and larger, smaller, larger, etc. are understood as excluding the present numbers, and larger, smaller, inner, etc. are understood as including the present numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise specifically limited, terms such as set, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention by combining the specific contents of the technical solutions.
The embodiment of the invention relates to a method for scrambling a satellite navigation signal of a communication and conduction combination, which is applied to an environment shown in figure 1, and comprises a satellite sending stage and a user machine receiving stage by referring to figure 2:
a satellite sending stage;
s100, a transmitting end of the satellite generates a scrambling sequence according to scrambling parameters; the scrambling parameter is an initial value for generating a scrambling sequence, and may be a pre-selected value or a value received by a transmitting end of a satellite. A scrambling sequence is generated according to the scrambling parameter, in this embodiment, a Logistic chaotic sequence is selected for the scrambling sequence, and two initial values (X and Y) are required when the Logistic chaotic sequence is adopted. Different scrambling sequences have different requirements for the initial value. Of course, other random sequences, such as GOLD sequences, may also be selected, and the Logistic chaotic sequence adopted in this embodiment has better randomness, can generate a random sequence of infinite length, and is sensitive to initial value changes.
S200, a sending end of the satellite generates a scrambled navigation signal according to the generated scrambling sequence, the navigation message spread spectrum code and the message bit information; specifically, a transmitting end of the satellite generates an original navigation message spreading code, scrambles the original navigation message spreading code through a scrambling sequence, and then performs spread spectrum modulation on preset message bit information by using the scrambled navigation message spreading code to obtain a scrambled navigation signal.
S300, framing and modulating the scrambling parameters and other communication information by a sending end of the satellite to obtain communication signals; the other communication information is information of other communication services that the satellite system needs to transmit.
S400, the sending end of the satellite jointly broadcasts the communication signal and the scrambled navigation signal.
User machine receiving stage:
s500, the user machine receives the communication signal sent by the satellite and the scrambled navigation signal.
S600, the user machine demodulates the communication signal to obtain a scrambling parameter, and generates a scrambling sequence according to the scrambling parameter; the user machine demodulates and demodulates the frame of the communication signal, extracts the scrambling parameter, and obtains the same Logistic chaotic sequence generated by the sending end through Logistic mapping.
S700, the user machine captures, tracks and demodulates the scrambled navigation signal according to the generated scrambling sequence and the navigation message spread spectrum code; specifically, the receiving end of the user machine scrambles the original navigation message spread spectrum code prestored locally according to the generated scrambling sequence to obtain the scrambled navigation message spread spectrum code, and then captures, tracks and demodulates the scrambled navigation signal by using the scrambled navigation message spread spectrum code.
Referring to fig. 3, the present invention also relates to a satellite navigation signal scrambling apparatus with combined conduction, including: the first scrambling module 110, the navigation signal generating module 120, the communication signal generating module 130, the satellite signal transmitting module 140, the satellite signal receiving module 210, the communication signal processing module 220, the second scrambling module 230 and the navigation signal processing module 240, wherein the first scrambling module 110 is configured to generate a scrambling sequence according to a scrambling parameter; the navigation signal generation module 120 is connected to the first scrambling module 110 and configured to scramble an original navigation message spreading code according to a scrambling sequence, and perform spread spectrum modulation on preset message bit information according to the scrambled navigation message spreading code to obtain a navigation signal; the first scrambling module 110 is connected to the communication signal generating module 130 and configured to frame and modulate the scrambling parameter and other communication information together to obtain a communication signal; the satellite signal transmitting module 140 is respectively connected to the communication signal generating module 130 and the navigation signal generating module 120 for jointly broadcasting the communication signal and the navigation signal; the satellite signal receiving module 210 is configured to receive the communication signal and the navigation signal broadcast by the satellite signal sending module 140; the communication signal processing module 220 is connected to the satellite signal receiving module 210 for demodulating the communication signal to obtain a scrambling parameter; the second scrambling module 230 is connected to the communication signal processing module 220 for generating a scrambling sequence according to the scrambling parameter; the navigation signal processing module 240 is connected to the second scrambling module 230 and the satellite signal receiving module 210, respectively, for acquiring, tracking and demodulating the navigation signal according to the scrambling sequence.
Referring to fig. 4, the present invention also relates to a system for scrambling a satellite navigation signal of a channel combination, comprising: a satellite and a user machine, wherein the satellite is internally provided with a first scrambling module 110, a navigation signal generating module 120, a communication signal generating module 130 and a satellite signal transmitting module 140 which are shown in fig. 3; the user machine is provided with a satellite signal receiving module 210, a communication signal processing module 220, a second scrambling module 230 and a navigation signal processing module 240 shown in fig. 3.
In summary, the scrambling sequence is used for scrambling the satellite navigation signal, so that the safety credibility of the civil satellite navigation signal is improved, and scrambling the navigation signal is equivalent to adding a layer of encryption to the navigation signal. And the user demodulates the navigation signal by using the scrambling sequence broadcast by the communication signal, and if the demodulation is successful, the navigation signal is proved to be safe and credible. And the scrambling parameters for generating the scrambling sequences are broadcasted through the communication signals, so that a user machine does not need to locally store a large number of scrambling sequences, local resources can be saved, meanwhile, the scrambling sequences can be updated in real time, and the safety and credibility of the civil satellite navigation signals are further improved.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (4)
1. A method for scrambling a navigation signal of a communication and conduction combined satellite is characterized by comprising the following steps:
a satellite transmission stage:
generating a scrambling sequence according to the scrambling parameters and generating a navigation message spread spectrum code;
generating a scrambled navigation signal according to the generated scrambling sequence, the navigation message spread spectrum code and the message bit information;
framing and modulating the scrambling parameters and other communication information together to obtain communication signals;
a sending end of the satellite jointly broadcasts the communication signal and the scrambled navigation signal;
receiving by the user machine;
the user machine receives the communication signal and the navigation signal transmitted by the satellite;
demodulating a communication signal to obtain a scrambling parameter, and generating a scrambling sequence according to the scrambling parameter;
capturing, tracking and demodulating the scrambled navigation signal according to the generated scrambling sequence and the navigation message spread spectrum code;
selecting a Logistic chaotic sequence from scrambling sequences in the satellite sending stage;
the specific steps of demodulating the communication signal in the receiving stage of the user machine to obtain the scrambling parameter and generating the scrambling sequence according to the scrambling parameter are as follows:
the user machine demodulates and demodulates the frame of the communication signal, extracts the scrambling parameter;
and obtaining a Logistic chaotic sequence which is the same as the satellite through Logistic mapping and is used as a scrambling sequence.
2. The method of claim 1, wherein the method comprises: the specific steps of generating the scrambled navigation signal according to the generated scrambling sequence, the navigation message spread spectrum code and the message bit information in the satellite sending stage are as follows:
firstly, generating original navigation message spread spectrum codes, scrambling the original navigation message spread spectrum codes by the scrambling sequence,
and then, carrying out spread spectrum modulation on the preset message bit information by using the scrambled navigation message spread spectrum code to obtain a scrambled navigation signal.
3. A combined-conduction satellite navigation signal scrambling apparatus applying the method of claim 1 or 2, comprising:
a first scrambling module (110) for generating a scrambling sequence according to a scrambling parameter;
the navigation signal generation module (120) is connected with the first scrambling module (110) and is used for scrambling an original navigation message spread spectrum code according to a scrambling sequence and performing spread spectrum modulation on preset message bit information according to the scrambled navigation message spread spectrum code to obtain a navigation signal;
the first scrambling module (110) is connected with the communication signal generating module (130) and is used for framing and modulating the scrambling parameters and other communication information together to obtain a communication signal;
the satellite signal sending module (140), the satellite signal sending module (140) is respectively connected with the communication signal generating module (130) and the navigation signal generating module (120) for jointly broadcasting the communication signal and the navigation signal;
the satellite signal receiving module (210), the satellite signal receiving module (210) is used for receiving the communication signal and the navigation signal broadcast by the satellite signal transmitting module (140);
a communication signal processing module (220), wherein the communication signal processing module (220) is connected with the satellite signal receiving module (210) for demodulating the communication signal to obtain a scrambling parameter;
a second scrambling module (230), said second scrambling module (230) being connected to said communication signal processing module (220) for generating a scrambling sequence in accordance with a scrambling parameter;
a navigation signal processing module (240), said navigation signal processing module (240) being connected to said second scrambling module (230) and said satellite signal receiving module (210) respectively for acquiring, tracking and demodulating navigation signals according to scrambling sequences.
4. A system for scrambling a combined pilot and satellite navigation signal, comprising: a satellite in which the first scramble module (110), the navigation signal generation module (120), the communication signal generation module (130), and the satellite signal transmission module (140) of claim 3 are disposed; the user machine is internally provided with a satellite signal receiving module (210), a communication signal processing module (220), a second scrambling module (230) and a navigation signal processing module (240) of claim 3.
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| CN104035104A (en) * | 2014-06-26 | 2014-09-10 | 桂林电子科技大学 | Anti-deception pseudo-satellite system and signal producing method |
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