CN117826198B - Method and device for generating pseudo code phase modulation-linear frequency modulation time division low-rail navigation signal - Google Patents
Method and device for generating pseudo code phase modulation-linear frequency modulation time division low-rail navigation signal 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
- G01S19/01—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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- 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
- G01S19/29—Acquisition or tracking or demodulation of signals transmitted by the system carrier including Doppler, related
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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
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
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- Signal Processing (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The application relates to a method and a device for generating a pseudo code phase modulation-linear frequency modulation time division low-rail navigation signal. The method comprises the following steps: constructing a time division evolution low orbit satellite navigation signal frame structure based on pseudo code phase modulation-linear frequency modulation; the frame structure consists of continuous signal frames, the signal frames comprise synchronous waveforms and precise following waveforms, the carrier frequency of a modulated carrier wave of the synchronous waveforms is periodically changed, a pseudo code modulating pseudo code adopts pseudo code phase modulation, and a multiple access mode adopts code division multiple access and/or pseudo code phase multiple access; the precise heel waveform is obtained through spread spectrum modulation, a synchronous waveform and a precise heel waveform are respectively generated, and a frame structure is adopted according to the synchronous waveform and the precise heel waveform to generate a pseudo code phase modulation-linear frequency modulation time division low rail navigation signal. The method can improve the performance of pseudo code phase modulation-linear frequency modulation system.
Description
Technical Field
The application relates to the technical field of navigation signal processing, in particular to a method and a device for generating a pseudo code phase modulation-linear frequency modulation time division low-rail navigation signal.
Background
The frequency band adopted by the low-orbit satellite navigation system is gradually expanded to higher signal frequency bands such as a C frequency band and a Ka frequency band from the traditional L frequency band, and in addition, the Doppler frequency shift of the low-orbit navigation signal received by a user is greatly increased and can reach tens or even hundreds of KHz due to low orbit of the low-orbit satellite and high movement speed. Under the large Doppler frequency offset, the satellite navigation signal of direct spread spectrum modulation is difficult to meet the requirement of rapid synchronization of users under the large Doppler frequency offset, and a low-orbit satellite navigation signal system under the large frequency offset needs to be researched. Research results have shown that the chirp system has a higher doppler margin than the direct spread spectrum system. The signal modulation system combining the pseudo-random code phase modulation and the linear frequency modulation carrier can realize the rapid synchronization under the condition of large Doppler frequency shift, but the performance of the current pseudo-code phase modulation-linear frequency modulation system is inferior to that of the pseudo-code direct spread spectrum system in the aspects of multi-channel signal cross-correlation performance, signal high-precision measurement and the like.
Disclosure of Invention
Based on the foregoing, it is necessary to provide a method and apparatus for generating a low-rail navigation signal in time division by using pseudo code phase modulation and linear frequency modulation, which can solve the performance problem of the current pseudo code phase modulation and linear frequency modulation system.
A method for generating a pseudo code phase modulation-chirp time division low rail navigation signal, the method comprising:
Constructing a time division evolution low orbit satellite navigation signal frame structure based on pseudo code phase modulation-linear frequency modulation; the frame structure consists of continuous signal frames, the signal frames comprise synchronous waveforms and precise follow waveforms, the carrier frequency of a modulated carrier wave of the synchronous waveforms is periodically changed, a pseudo code is modulated by a pseudo code phase, and a multiple access mode adopts code division multiple access and/or pseudo code phase multiple access; the fine heel waveform is obtained through spread spectrum modulation;
and respectively generating the synchronous waveform and the fine heel waveform, and generating a pseudo code phase modulation-linear frequency modulation time division low-rail navigation signal by adopting the frame structure according to the synchronous waveform and the fine heel waveform.
In one embodiment, the periodic variation indicates that the carrier frequency of the modulated carrier is changed from 0 toSecond time slot slave/>Changing to 0, the third slot changes from 0 to/>Fourth slot slave/>Changing to 0.
In one embodiment, the method further comprises: the carrier frequency of the modulated carrier changes linearly in the first time slot, the second time slot, the third time slot, and the fourth time slot.
In one embodiment, the method further comprises: calculating to obtain a frequency accumulated value of the synchronous waveform according to the signal bandwidth, the period and the carrier frequency; outputting the current carrier frequency of the synchronous signal in an accumulation mode according to the frequency accumulation value; according to the current carrier frequency, calculating to obtain the current carrier phase of the synchronous signal; according to the carrier phase, calculating to obtain the current carrier of the synchronous signal; according to the current carrier wave and the carrier wave frequency of the next moment, calculating to obtain the carrier wave of the next moment; generating a current pseudo code of a current time synchronizing signal according to a current time carrier; and generating a synchronous signal according to the pseudo code at the current moment and the carrier wave at the current moment.
In one embodiment, the method further comprises: generating waveform parameters of the fine heel waveform includes:
；
wherein, Representing the heel waveform,/>Representing spread spectrum modulation.
In one embodiment, the method further comprises: according to the synchronous waveform and the fine tracking waveform, adopting the frame structure to generate a pseudo code phase modulation-linear frequency modulation time division low-rail navigation signal as follows:
；
wherein, Representing a time-division low-rail navigation signal,/>Representing a synchronization signal,/>Representing signal frame length,/>Representing the synchronization signal duration,/>Representing the signal bandwidth.
A pseudo code phase modulation-chirp time division low rail navigation signal generation apparatus, the apparatus comprising:
Constructing a time division evolution low orbit satellite navigation signal frame structure based on pseudo code phase modulation-linear frequency modulation; the frame structure consists of continuous signal frames, the signal frames comprise synchronous waveforms and precise follow waveforms, the carrier frequency of a modulated carrier wave of the synchronous waveforms is periodically changed, a pseudo code is modulated by a pseudo code phase, and a multiple access mode adopts code division multiple access and/or pseudo code phase multiple access; the fine heel waveform is obtained through spread spectrum modulation;
and respectively generating the synchronous waveform and the fine heel waveform, and generating a pseudo code phase modulation-linear frequency modulation time division low-rail navigation signal by adopting the frame structure according to the synchronous waveform and the fine heel waveform.
In one embodiment, the periodic variation indicates that the carrier frequency of the modulated carrier is changed from 0 toSecond time slot slave/>Changing to 0, the third slot changes from 0 to/>Fourth time slot from-/>Changing to 0.
In one embodiment, the carrier frequency of the modulated carrier varies linearly in the first time slot, the second time slot, the third time slot, and the fourth time slot.
In one embodiment, the signal generating module is further configured to calculate a frequency accumulated value of the synchronization waveform according to the signal bandwidth, the period and the carrier frequency; outputting the current carrier frequency of the synchronous signal in an accumulation mode according to the frequency accumulation value; according to the current carrier frequency, calculating to obtain the current carrier phase of the synchronous signal; according to the carrier phase, calculating to obtain the current carrier of the synchronous signal; according to the current carrier wave and the carrier wave frequency of the next moment, calculating to obtain the carrier wave of the next moment; generating a current pseudo code of a current time synchronizing signal according to a current time carrier; and generating a synchronous signal according to the pseudo code at the current moment and the carrier wave at the current moment.
The method and the device for generating the time division low-rail navigation signal of pseudo code phase modulation-linear frequency modulation are designed to have a low-rail navigation signal structure capable of evolving in time division, and the low-rail navigation signal structure is composed of synchronous waveforms and fine-heeled waveforms, wherein the synchronous waveforms are mainly used for capturing and roughly synchronizing the low-rail navigation signal, and the fine-heeled waveforms are mainly used for measuring and demodulating the low-rail navigation signal, so that the low-rail navigation signal has high-precision measuring and demodulating capabilities, and the performance of a pseudo code phase modulation-linear frequency modulation system is improved.
Drawings
FIG. 1 is a flow chart of a method for generating a pseudo code phase modulation-chirp time division low-rail navigation signal in one embodiment;
FIG. 2 is a schematic diagram of a frame structure of a time division evolution low-orbit satellite navigation signal based on a synchronous waveform in one embodiment;
FIG. 3 is a schematic diagram of carrier and pseudocode modulation of a pseudocode phase-chirped low-orbit satellite navigation signal synchronization waveform in one embodiment;
FIG. 4 is a block diagram of a pseudo code phase modulation-chirp time division low-rail navigation signal generation apparatus in one embodiment;
FIG. 5 is a schematic diagram of a low-orbit satellite navigation signal generating device based on a synchronization waveform according to an embodiment;
fig. 6 is an internal structural diagram of a computer device in one embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
In one embodiment, as shown in fig. 1, a method for generating a pseudo code phase modulation-chirp time division low-rail navigation signal is provided, which includes the following steps:
Step 102, constructing a time division evolution low orbit satellite navigation signal frame structure based on pseudo code phase modulation-linear frequency modulation.
The frame structure is composed of continuous signal frames, the signal frames comprise synchronous waveforms and precise following waveforms, as shown in figure 2, the carrier frequency of the modulated carrier wave of the synchronous waveforms is periodically changed, the pseudo code modulation adopts pseudo code phase modulation, and the multiple access mode adopts code division multiple access and/or pseudo code phase multiple access; the fine heel waveform is obtained through spread spectrum modulation.
Specifically, the time-division evolution low-orbit satellite navigation signal is formed by a plurality of continuous signal frames in the time domain, and the length of each signal frame is as followsWherein the duration of the synchronization waveform is/>The duration of the heel waveform is/>The signal synchronization waveform is used for supporting rough estimation of parameters such as low-rail navigation signal transmission delay, doppler shift and the like by the user terminal equipment, and realizing rapid acquisition of the signal by the user. The signal fine-tracking waveform is used for supporting accurate estimation of parameters such as low-rail navigation signal transmission delay, doppler frequency shift, carrier phase and the like by the user terminal equipment, and realizing measurement and demodulation of the signal by a user.
Step 104, respectively generating a synchronous waveform and a fine heel waveform, and generating a time division low-rail navigation signal of pseudo code phase modulation-linear frequency modulation by adopting a frame structure according to the synchronous waveform and the fine heel waveform.
In the time division low-rail navigation signal generation method of pseudo code phase modulation-linear frequency modulation, by designing a time division evolution low-rail navigation signal structure, the method comprises the steps of synchronous waveform and fine-heeled waveform, wherein the synchronous waveform is mainly used for capturing and roughly synchronizing the low-rail navigation signal, and the fine-heeled waveform is mainly used for measuring and demodulating the low-rail navigation signal, so that the low-rail navigation signal has high-precision measuring and demodulating capabilities, and the pseudo code phase modulation-linear frequency modulation system performance is improved.
In one embodiment, as shown in FIG. 3, the periodic variation indicates that the carrier frequency of the modulated carrier is changed from 0 toSecond time slot slave/>Changing to 0, the third slot changes from 0 to/>Fourth slot slave/>Changing to 0.
In another embodiment, the variation of the carrier frequency of the modulated carrier in the first time slot, the second time slot, the third time slot, and the fourth time slot is linear, and the duration of each time slot is one quarter cycle.
In a specific embodiment, the generation of the synchronization waveform is as follows:
s1, adopting pseudo code phase modulation-linear frequency modulation system for synchronous waveform, wherein the pseudo code phase modulation-linear frequency modulation system comprises Each basic synchronous waveform is composed of a plurality of basic synchronous waveforms with the duration of/>The baseband expression is noted as:
；
Wherein the method comprises the steps of Is a pseudo code modulated in a synchronous waveform,/>Is a frequency modulated carrier wave of synchronous waveform.
S2, the FM carrier wave in each basic synchronous waveform is divided into four time slots, and the length of each time slot isThe carrier frequency of the first slot varies linearly from 0 to/>Carrier frequency slave/>, of the second slotLinearly changing to 0, the third slotted carrier frequency linearly changing from 0 to/>Fourth time slot carrier frequency Slave/>Linearly changing to 0, the signal carrier frequency is readjusted back to 0 over four time slots, and the corresponding signal carrier phase is also readjusted back to 0.
S3, as shown in FIG. 3, modulating a spreading code in the synchronous waveform signal, wherein the code rate of the spreading code isSpreading code periodCorresponding to the duration of two time slots of the frequency modulated carrier. Different spread spectrum code sequences which can be modulated by navigation signals broadcast by different low orbit satellites can be used for realizing the multiple access receiving of the user to different satellites, the same spread spectrum code sequences can be modulated, different satellites correspond to different spread spectrum code initial phases, the multiple access receiving of the user to different satellites can be realized, the same mode of code sequence and code phase mixed multiple access can be adopted, namely, the low orbit satellites are grouped, the spread spectrum code phase multiple access mode is adopted in the group, and different spread spectrum code sequences are adopted among groups.
With multiple access of different code sequences, the synchronization waveform signals of different satellites are as follows
；
Wherein the method comprises the steps ofRepresenting different satellite signs,/>Representing the corresponding synchronization waveforms of different satellites,/>Representing different spreading code sequences;
When the same code sequence is adopted for different code phase multiple access, the synchronous waveform signals of different satellites are as follows
；
Wherein the method comprises the steps ofCode phase delay. Similarly, a hybrid of two multiple access schemes may be employed.
S4, optimizing design of synchronous waveform parameters according to supported maximum DopplerDesigning the maximum frequency modulation frequency;
；
Wherein the method comprises the steps of When the signal delay/>Satisfy/>Taking the maximum value in the fuzzy function, and calculating to obtain supportable maximum Doppler frequency shift/>, according to the maximum value of the time delay，/>，
I.e. half the maximum fm frequency.
In one embodiment, a frequency accumulated value of the synchronous waveform is calculated according to the signal bandwidth, the period and the carrier frequency; outputting the current carrier frequency of the synchronous signal in an accumulation mode according to the frequency accumulation value; according to the current carrier frequency, calculating to obtain the current carrier phase of the synchronous signal; according to the carrier phase, calculating to obtain the current carrier of the synchronous signal; according to the current carrier wave and the carrier wave frequency of the next moment, calculating to obtain the carrier wave of the next moment; generating a current pseudo code of a current time synchronizing signal according to a current time carrier; and generating a synchronous signal according to the pseudo code at the current moment and the carrier wave at the current moment.
Specifically, the specific steps for generating the synchronization signal are as follows:
s11, calculating carrier frequency of pseudo code phase modulation-linear frequency modulation synchronous waveform, and outputting corresponding carrier frequency through accumulation each time under the drive of a generated clock, wherein the specific method comprises the following steps:
；
Wherein the method comprises the steps of For/>Carrier frequency value accumulated under each clock beat, initial value/>，/>The frequency accumulation is specifically:
；
Wherein the method comprises the steps of Is the signal bandwidth. According to the synchronous waveform of step S2, after the frequency value calculation is completed, the/>The iterative update is carried out, and the update method is as follows:
；
wherein, 。
S12, calculating carrier phases of pseudo code phase modulation-linear frequency modulation synchronous waveforms:
；
Initial value of Typically 0.
S13, carrier wave generation of pseudo code phase modulation-linear frequency modulation synchronous waveform:
；
S14, calculating the pseudo code phase of the pseudo code phase modulation-linear frequency modulation synchronous waveform:
；
When different satellites adopt spread spectrum code phase multiple access for spread spectrum code frequency, the corresponding phase initial value/>, of different satellites Different.
S15: pseudo code generation of pseudo code phase modulation-chirp synchronous waveform:
；
When different satellites adopt multiple access of the spread spectrum code sequence, the different satellites correspond to different spread spectrum code sequences 。
S16: generation of pseudo code phase modulation-chirp synchronization waveforms:
；
In one embodiment, generating the waveform parameters of the heel waveform includes:
；
wherein, Representing the heel waveform,/>Representing spread spectrum modulation.
In another embodiment, according to the synchronous waveform and the fine-heeled waveform, a frame structure is adopted to generate a pseudo code phase modulation-linear frequency modulation time division low-rail navigation signal, wherein the time division low-rail navigation signal comprises the following components:
；
wherein, Representing a time-division low-rail navigation signal,/>Representing a synchronization signal,/>Representing signal frame length,/>Representing the synchronization signal duration,/>Representing the signal bandwidth.
It should be understood that, although the steps in the flowchart of fig. 1 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 1 may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor do the order in which the sub-steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of other steps or sub-steps of other steps.
In one embodiment, as shown in fig. 4, there is provided a pseudo code phase modulation-chirp time division low-rail navigation signal generating apparatus, comprising: a frame structure construction module 402 and a signal generation module 404, wherein:
A frame structure construction module 402, configured to construct a time division evolution low orbit satellite navigation signal frame structure based on pseudo code phase modulation-chirp; the frame structure consists of continuous signal frames, the signal frames comprise synchronous waveforms and precise follow waveforms, the carrier frequency of a modulated carrier wave of the synchronous waveforms is periodically changed, a pseudo code is modulated by a pseudo code phase, and a multiple access mode adopts code division multiple access and/or pseudo code phase multiple access; the fine heel waveform is obtained through spread spectrum modulation;
The signal generating module 404 is configured to generate the synchronization waveform and the fine heel waveform respectively, and generate a pseudo code phase modulation-chirp time division low rail navigation signal according to the synchronization waveform and the fine heel waveform and by adopting the frame structure.
In one embodiment, the periodic variation indicates that the carrier frequency of the modulated carrier is changed from 0 toSecond time slot slave/>Changing to 0, the third slot changes from 0 to/>Fourth slot slave/>Changing to 0.
In one embodiment, the carrier frequency of the modulated carrier varies linearly in the first time slot, the second time slot, the third time slot, and the fourth time slot.
In one embodiment, the signal generating module 404 is further configured to calculate a frequency accumulated value of the synchronization waveform according to the signal bandwidth, the period and the carrier frequency; outputting the current carrier frequency of the synchronous signal in an accumulation mode according to the frequency accumulation value; according to the current carrier frequency, calculating to obtain the current carrier phase of the synchronous signal; according to the carrier phase, calculating to obtain the current carrier of the synchronous signal; according to the current carrier wave and the carrier wave frequency of the next moment, calculating to obtain the carrier wave of the next moment; generating a current pseudo code of a current time synchronizing signal according to a current time carrier; and generating a synchronous signal according to the pseudo code at the current moment and the carrier wave at the current moment.
In one embodiment, the signal generating module 404 is further configured to generate waveform parameters of the heel waveform including:
；
wherein, Representing the heel waveform,/>Representing spread spectrum modulation.
In one embodiment, the signal generating module 404 is further configured to generate, according to the synchronization waveform and the fine tracking waveform, a time-division low-rail navigation signal with pseudo code phase modulation-chirp by adopting the frame structure, where the time-division low-rail navigation signal is:
；
wherein, Representing a time-division low-rail navigation signal,/>Representing a synchronization signal,/>Representing signal frame length,/>Representing the synchronization signal duration,/>Representing the signal bandwidth.
For easy understanding, as shown in fig. 5, the above-mentioned apparatuses are divided into a pseudo code phase modulation-chirp synchronization signal generating apparatus and a fine heel waveform generating apparatus, wherein the fine heel waveform generating apparatus 512 is controlled by a clock, the pseudo code phase modulation-chirp synchronization signal generating apparatus includes a carrier frequency calculating apparatus 502, a carrier phase calculating apparatus 504, a carrier generating apparatus 506, a pseudo code phase calculating apparatus 508 and a pseudo code generating apparatus 510, outputs of the carrier generating apparatus 506 and the pseudo code generating apparatus 510 are outputted to an output selecting module 516 through a cross product 514, and the output selecting module 516 selects according to outputs of the fine heel waveform generating apparatus 512 and the cross product 514, and finally, a low-rail navigation signal is obtained.
For specific limitation of the pseudo code phase modulation-chirp time division low-rail navigation signal generation device, reference may be made to the above limitation of the pseudo code phase modulation-chirp time division low-rail navigation signal generation method, and the description thereof will be omitted. The above-mentioned various modules in the pseudo code phase modulation-chirp time division low-rail navigation signal generating device can be implemented in whole or in part by software, hardware and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure of which may be as shown in fig. 6. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a pseudo code phase modulation-chirp time division low rail navigation signal generation method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in FIG. 6 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In an embodiment a computer device is provided comprising a memory storing a computer program and a processor implementing the steps of the method of the above embodiments when the computer program is executed.
In one embodiment, a computer readable storage medium is provided, on which a computer program is stored which, when executed by a processor, implements the steps of the method of the above embodiments.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile 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 (SYNCHLINK) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (6)
1. A method for generating a pseudo code phase modulation-chirp time division low-rail navigation signal, the method comprising:
Constructing a time division evolution low orbit satellite navigation signal frame structure based on pseudo code phase modulation-linear frequency modulation; the frame structure consists of continuous signal frames, the signal frames comprise synchronous waveforms and precise follow waveforms, the carrier frequency of a modulated carrier wave of the synchronous waveforms is periodically changed, a pseudo code is modulated by a pseudo code phase, and a multiple access mode adopts code division multiple access and/or pseudo code phase multiple access; the fine heel waveform is obtained through spread spectrum modulation;
generating the synchronous waveform and the fine heel waveform respectively, and generating a pseudo code phase modulation-linear frequency modulation time division low-rail navigation signal by adopting the frame structure according to the synchronous waveform and the fine heel waveform;
Generating the synchronization waveform includes:
Calculating to obtain a frequency accumulated value of the synchronous waveform according to the signal bandwidth, the period and the carrier frequency;
outputting the current carrier frequency of the synchronous signal in an accumulation mode according to the frequency accumulation value;
according to the current carrier frequency, calculating to obtain the current carrier phase of the synchronous signal;
according to the carrier phase, calculating to obtain the current carrier of the synchronous signal;
According to the current carrier wave and the carrier wave frequency of the next moment, calculating to obtain the carrier wave of the next moment;
generating a current pseudo code of a current time synchronizing signal according to a current time carrier;
Generating a synchronous signal according to the pseudo code at the current moment and the carrier wave at the current moment;
generating waveform parameters of the fine heel waveform includes:
wherein, Representing the heel waveform,/>Representing spread spectrum modulation;
according to the synchronous waveform and the fine tracking waveform, the frame structure is adopted to generate a pseudo code phase modulation-linear frequency modulation time division low-rail navigation signal, which comprises the following steps:
According to the synchronous waveform and the fine tracking waveform, adopting the frame structure to generate a pseudo code phase modulation-linear frequency modulation time division low-rail navigation signal as follows:
wherein, Representing a time-division low-rail navigation signal,/>Representing a synchronization signal,/>Representing signal frame length,/>Representing the synchronization signal duration,/>Representing the signal bandwidth.
2. The method of claim 1, wherein the periodic variation indicates that the carrier frequency of the modulated carrier varies from 0 to f B in a first time slot, from f B to 0 in a second time slot, from 0 to-f B in a third time slot, and from-f B to 0 in a fourth time slot.
3. The method of claim 2, wherein the change in carrier frequency of the modulated carrier in the first time slot, the second time slot, the third time slot, and the fourth time slot is a linear change.
4. A pseudo code phase modulation-chirp time division low rail navigation signal generation apparatus, the apparatus comprising:
The frame structure construction module is used for constructing a time division evolution low-orbit satellite navigation signal frame structure based on pseudo code phase modulation-linear frequency modulation; the frame structure consists of continuous signal frames, the signal frames comprise synchronous waveforms and precise follow waveforms, the carrier frequency of a modulated carrier wave of the synchronous waveforms is periodically changed, a pseudo code is modulated by a pseudo code phase, and a multiple access mode adopts code division multiple access and/or pseudo code phase multiple access; the fine heel waveform is obtained through spread spectrum modulation;
The signal generation module is used for respectively generating the synchronous waveform and the fine heel waveform, and generating a pseudo code phase modulation-linear frequency modulation time division low-rail navigation signal by adopting the frame structure according to the synchronous waveform and the fine heel waveform;
The signal generation module is also used for calculating and obtaining a frequency accumulated value of the synchronous waveform according to the signal bandwidth, the period and the carrier frequency; outputting the current carrier frequency of the synchronous signal in an accumulation mode according to the frequency accumulation value; according to the current carrier frequency, calculating to obtain the current carrier phase of the synchronous signal; according to the carrier phase, calculating to obtain the current carrier of the synchronous signal; according to the current carrier wave and the carrier wave frequency of the next moment, calculating to obtain the carrier wave of the next moment; generating a current pseudo code of a current time synchronizing signal according to a current time carrier; generating a synchronous signal according to the pseudo code at the current moment and the carrier wave at the current moment;
The signal generating module is further configured to generate waveform parameters of the heel waveform, including:
wherein, Representing the heel waveform,/>Representing spread spectrum modulation;
the signal generating module is further configured to generate a pseudo code phase modulation-chirp time division low-rail navigation signal according to the synchronization waveform and the fine tracking waveform by adopting the frame structure, where the time division low-rail navigation signal is:
wherein, Representing a time-division low-rail navigation signal,/>Representing a synchronization signal,/>Representing signal frame length,/>Representing the synchronization signal duration,/>Representing the signal bandwidth.
5. The apparatus of claim 4, wherein the periodic variation indicates that the carrier frequency of the modulated carrier varies from 0 to f B in a first time slot, from f B to 0 in a second time slot, from 0 to-f B in a third time slot, and from-f B to 0 in a fourth time slot.
6. The apparatus of claim 5, wherein the change in carrier frequency of the modulated carrier in the first time slot, the second time slot, the third time slot, and the fourth time slot is a linear change.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05206984A (en) * | 1992-01-24 | 1993-08-13 | Victor Co Of Japan Ltd | Synchronization pick-up/holding system and demodulator of spectrum spread modulation wave |
| CN1284220A (en) * | 1997-11-20 | 2001-02-14 | 鹰眼技术公司 | Low-power satellite-based geopositioning system |
| CN102571671A (en) * | 2012-01-13 | 2012-07-11 | 重庆邮电大学 | Modified smoothed pseudo Wigner-Ville distribution-based (MSPWVD-based) blind estimation method for pseudo code sequence of pseudo-random Bi-phase code-linear frequency modulation (PRBC-LFM) composite signal |
| CN107064968A (en) * | 2016-11-23 | 2017-08-18 | 北京自动化控制设备研究所 | A kind of Big Dipper B1 signal highly-sensitive catching methods based on chirp z transform |
| RU181855U1 (en) * | 2018-03-26 | 2018-07-26 | Алексей Владимирович Зюзин | Digital synthesis device for a multi-frequency linear-frequency-modulated phase-coded signal in the mode of full-polarization sounding of space |
| CN116298515A (en) * | 2023-05-23 | 2023-06-23 | 北京鼎诚鸿安科技发展有限公司 | Synchronous waveform measuring terminal and measuring method thereof |
| CN117310763A (en) * | 2023-11-30 | 2023-12-29 | 中国人民解放军国防科技大学 | Method and device for synchronizing pseudo code phase modulation-linear frequency modulation time division low-rail navigation signals |
-
2024
- 2024-03-04 CN CN202410241150.5A patent/CN117826198B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05206984A (en) * | 1992-01-24 | 1993-08-13 | Victor Co Of Japan Ltd | Synchronization pick-up/holding system and demodulator of spectrum spread modulation wave |
| CN1284220A (en) * | 1997-11-20 | 2001-02-14 | 鹰眼技术公司 | Low-power satellite-based geopositioning system |
| CN102571671A (en) * | 2012-01-13 | 2012-07-11 | 重庆邮电大学 | Modified smoothed pseudo Wigner-Ville distribution-based (MSPWVD-based) blind estimation method for pseudo code sequence of pseudo-random Bi-phase code-linear frequency modulation (PRBC-LFM) composite signal |
| CN107064968A (en) * | 2016-11-23 | 2017-08-18 | 北京自动化控制设备研究所 | A kind of Big Dipper B1 signal highly-sensitive catching methods based on chirp z transform |
| RU181855U1 (en) * | 2018-03-26 | 2018-07-26 | Алексей Владимирович Зюзин | Digital synthesis device for a multi-frequency linear-frequency-modulated phase-coded signal in the mode of full-polarization sounding of space |
| CN116298515A (en) * | 2023-05-23 | 2023-06-23 | 北京鼎诚鸿安科技发展有限公司 | Synchronous waveform measuring terminal and measuring method thereof |
| CN117310763A (en) * | 2023-11-30 | 2023-12-29 | 中国人民解放军国防科技大学 | Method and device for synchronizing pseudo code phase modulation-linear frequency modulation time division low-rail navigation signals |
Non-Patent Citations (3)
| Title |
|---|
| A high sensitivity carrier frequency tracking algorithm for satellite navigation receiver;Honglei Lin 等;Proceedings of the 2020 4th International Conference on Electronic Information Technology and Computer Engineering;20201106;第302-306页 * |
| 伪码调相与线性调频复合调制引信;周新刚 等;宇航学报;20080530;第29卷(第03期);第1026-1030页 * |
| 卫星导航系统中多址干扰引起的伪码跟踪误差的分析;李星 等;信号处理;20081015;第24卷(第05期);第885-888页 * |
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