CN113541728B - Method, system and medium for guided acquisition of short code signal to long code signal - Google Patents
Method, system and medium for guided acquisition of short code signal to long code signal Download PDFInfo
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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
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/71—Interference-related aspects the interference being narrowband interference
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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
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7075—Synchronisation aspects with code phase acquisition
Abstract
The invention discloses a method, a system and a medium for guiding and capturing a long code signal by a short code signal, wherein the method for guiding and capturing the long code signal by the short code signal comprises the following steps: acquiring a first signal, wherein the first signal is a direct sequence spread spectrum signal combined by a long code and a short code; performing secondary spread spectrum on the basis of the short code signal spread spectrum sequence of the first signal to obtain a secondary spread spectrum code; optimally designing the secondary spread spectrum code according to the code isolation; selecting the length of a secondary spread spectrum code sequence according to the index requirement of a receiver; and capturing the short code signal, and performing signal time synchronization by using a secondary spread spectrum code to guide the capture of the long code signal of the first signal. The power spectrum shape of the short code signal can be improved, the guiding capability of the short code signal for capturing the long code signal is favorably improved, the anti-interference capability of the short code signal is greatly improved, and the practical value is very high under the actual complex confrontation condition.
Description
Technical Field
The invention relates to the technical field of signal system design, in particular to a method, a system and a medium for guiding and capturing a long code signal by a short code signal.
Background
In an uplink injection system of a satellite navigation system, a signal system mainly adopts a direct sequence spread spectrum modulation mode, and comprises a short code signal and a long code signal according to system requirements, wherein the short code signal is mainly used for transmitting public information and guiding the long code signal to capture, and the long code signal is higher in safety and mainly used for transmitting high-safety information.
The short code signal is usually short in period, generally 1ms, 2ms or 5ms, and the periodicity thereof causes the power spectrum to be composed of discrete power spectral lines, so that the interference resistance of the signal is greatly affected when single-frequency interference overlaps with the spectrum of the short code signal. The acquisition of the long code signal needs the guidance of the short code signal, but the weak anti-interference capability of the short code signal makes the short code signal almost unable to complete guidance under the countermeasure condition, so the direct acquisition of the long code signal is the guarantee for realizing the reception of the long code signal under the strong countermeasure condition. The long code signal has extremely long period and high code rate, and has huge number of code phases required to be searched for direct acquisition and high requirements on power consumption of a receiver and time keeping precision of the receiver.
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 for guiding and capturing a long code signal by a short code signal, which improves the anti-interference capability of the short code signal and improves the capturing capability of the short code guiding long code.
The invention also provides a system for guiding and capturing the long code signal by the short code signal, which has the method for guiding and capturing the long code signal by the short code signal.
The invention also provides a computer readable storage medium.
In one aspect, the present embodiment provides a method for pilot capture of a long code signal by a short code signal, including the following steps:
acquiring a first signal, wherein the first signal is a direct sequence spread spectrum signal combined by a long code and a short code;
performing secondary spread spectrum on the basis of the short code signal spread spectrum sequence of the first signal to obtain a secondary spread spectrum code of the short code signal;
optimally designing the secondary spread spectrum code according to the code isolation;
selecting the sequence length of the secondary spread spectrum code according to the index requirement of a receiver to obtain the optimized secondary spread spectrum code;
and capturing the short code signal, and performing signal time synchronization by using the optimized secondary spread spectrum code to guide and capture the long code signal of the first signal.
The method for guiding and capturing the long code signal by the short code signal according to the embodiment of the invention has at least the following beneficial effects: firstly, establishing a secondary spread spectrum model, performing secondary spread spectrum on the basis of a short code signal spread spectrum sequence of a first signal to obtain a secondary spread spectrum code, wherein the first signal is a direct sequence spread spectrum signal combined with a long code and a short code, the power spectral lines of the short code signal after secondary spread spectrum are denser, the narrow-band interference resistance of the short code signal can be effectively improved, then the secondary spread spectrum code is optimally designed according to code isolation, the short code cross-correlation isolation represents the cross-correlation interference degree among multi-user signals, the cross-correlation isolation of two stages of capturing and tracking can be divided from a signal processing level, the code cross-correlation isolation of a capturing stage and a tracking stage needs to be searched, all pseudo code phases need to be searched in the capturing stage, and the code cross-correlation isolation depends on the cross-correlation values of all relative code phase delays at the moment; in the tracking stage, the relative time delay difference between the local signal and other signals is small, and the short code cross-correlation isolation degree in the tracking stage depends on the pseudo code cross-correlation value in the maximum relative time delay range.
Secondly, selecting the length of the secondary spread spectrum code sequence according to the index requirement of a receiver, capturing the short code signal, performing signal time synchronization by using the secondary spread spectrum code, and guiding to capture the long code signal of the first signal. The method for guiding and capturing the long code signal by the short code signal improves the power spectrum shape of the short code signal, improves the narrowband interference resistance of the short code signal, greatly improves the code isolation of the short code signal, reduces the cross-correlation interference of multi-user signals in the capturing and tracking stages, improves the time synchronization capacity of the short code signal and improves the guiding and capturing performance of the long code signal.
According to some embodiments of the invention, the spreading the second time of the short code signal on the basis of the short code signal spreading sequence of the first signal to obtain the second spreading code of the short code signal, comprises:
the secondary spread spectrum code is modulated on the primary spread spectrum code sequence, and the chip width of the secondary spread spectrum code is equal to the period of the short code signal spread spectrum sequence. The secondary spread spectrum means that a primary secondary spread spectrum code is further modulated on the basis of a short code sequence, the chip duration of the secondary spread spectrum code is usually one period length of the short code sequence, and the code sequence of the secondary spread spectrum code is optimally designed according to the cross-correlation isolation of short code signals, so that the anti-interference capability of the short code signals can be effectively improved, and the capture capability of the short code guide long codes is improved.
According to some embodiments of the present invention, the optimally designing the secondary spreading code according to the code isolation comprises:
and acquiring a relative time delay range of the code isolation, and searching the sequence of the secondary spread spectrum code meeting the requirement in the relative time delay range through a genetic algorithm.
According to some embodiments of the present invention, the selecting the sequence length of the secondary spreading code according to the receiver index requirement to obtain the optimized secondary spreading code comprises:
and selecting the sequence length of the secondary spread spectrum code by combining the code isolation, the guided capture computation complexity of the long code signal and the synchronization time of the secondary spread spectrum code.
According to some embodiments of the present invention, the time synchronization of the signal by using the optimized secondary spreading code to guide the acquisition of the long code signal of the first signal comprises:
the time for receiving the short code signal by the receiver comprises integral multiple of the repetition period time of the secondary spread spectrum code. The pseudo code phase of search judgment is reduced, the calculation complexity of long code signal capture is reduced, and under the condition of adopting secondary spread spectrum codes and under the condition of partial secondary spread spectrum code error codes, the time estimation error of received signals cannot be caused, so that compared with the traditional implementation mode of text information, the method has higher robustness and safety.
According to some embodiments of the present invention, the code isolation is calculated by a pseudo code sequence repetition period, a time delay range, and a composite code obtained by performing secondary spreading on the pseudo code sequence.
In a second aspect, the present embodiment provides a system for guided acquisition of a long code signal by a short code signal, including: memory, processor and computer program stored on the memory and executable on the processor, characterized in that the processor implements the method for guided acquisition of a long code signal from a short code signal as described in the first aspect when executing the computer program.
The system for guiding and capturing the long code signal by the short code signal according to the embodiment of the invention has at least the following beneficial effects: the system for guiding and capturing the long code signal by the short code signal of the embodiment applies the method for guiding and capturing the long code signal by the short code signal described in the first aspect, and can improve the power spectrum shape of the short code signal, improve the narrowband interference resistance of the short code signal, greatly improve the code isolation of the short code signal, reduce the multi-user signal cross-correlation interference in the capturing and tracking stages, improve the time synchronization capability of the short code signal, and improve the guiding and capturing performance of the long code signal.
In a third aspect, the present embodiment provides a computer-readable storage medium, which stores computer-executable instructions for causing a computer to perform the method for pilot acquisition of a long code signal by a short code signal according to the first aspect.
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 the abstract is to be fully consistent with one of the figures of the specification:
fig. 1 is a flowchart of a pilot acquisition method for a short code signal to a long code signal according to an embodiment of the present invention;
fig. 2 is a timing diagram of a second spreading code of a pilot acquisition method for a short code signal to a long code signal according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further 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 invention and do not limit the invention.
It is noted that while a division of functional blocks is depicted in the system diagram, and logical order is depicted in the flowchart, in some cases the steps depicted and described may be performed in a different order than the division of blocks in the system or the flowchart. The terms first, second and the like in the description and in the claims, and the drawings described above, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
The short code signal period in the conventional signal is usually short, and the periodicity thereof causes the power spectrum to be composed of discrete power spectral lines, and the multiple access resistance and the interference resistance thereof are limited. The short code signal provides coarse time information for the long code signal, so that the short code signal cannot provide guidance information for the acquisition of the long code when the short code signal is demodulated to generate error code under the conditions of strong multiple access interference and strong countermeasure.
The invention provides a method for guiding and capturing a long code signal by a short code signal, which carries out secondary spread spectrum on a direct sequence spread spectrum signal combined with a long code and a short code on the basis of primary spread spectrum, improves the power spectrum shape of the short code signal, improves the narrow-band interference resistance of the short code signal, greatly improves the code isolation of the short code signal, reduces the multi-user signal cross-correlation interference in the capturing and tracking stages, improves the time synchronization capability of the short code signal and improves the guiding and capturing performance of the long code signal.
The embodiments of the present invention will be further explained with reference to the drawings.
Referring to fig. 1 and fig. 2, fig. 1 is a flowchart of a pilot acquisition method of a short code signal to a long code signal according to an embodiment of the present invention, and fig. 2 is a timing chart of a secondary spreading code of the pilot acquisition method of the short code signal to the long code signal according to another embodiment of the present invention, where the pilot acquisition method of the short code signal to the long code signal includes, but is not limited to, steps S110 to S150.
Step S110, obtaining a first signal, wherein the first signal is a direct sequence spread spectrum signal combined by a long code and a short code;
step S120, performing secondary spread spectrum on the basis of the short code signal spread spectrum sequence of the first signal to obtain a secondary spread spectrum code of the short code signal;
step S130, optimally designing the secondary spread spectrum code according to the code isolation;
step S140, selecting the sequence length of the secondary spread spectrum code according to the index requirement of the receiver to obtain the optimized secondary spread spectrum code;
step S150, capturing the short code signal, performing signal time synchronization by using the optimized secondary spreading code, and guiding to capture the long code signal of the first signal.
In one embodiment, a first signal is obtained firstly, the first signal is a direct sequence spread spectrum signal combined by a long code and a short code, then a secondary spread spectrum code is optimally designed according to code isolation, a relative time delay range needing to consider the code isolation is analyzed respectively aiming at a capturing stage and a tracking stage, and a secondary spread spectrum code sequence meeting indexes is searched in the relative time delay range through a genetic algorithm; then, selecting the length of a secondary spreading code sequence according to the index requirement of a comprehensive receiver, integrating indexes such as code isolation, long code signal guide capture computation complexity, secondary spreading code synchronization time and the like, and selecting the length of the secondary spreading code sequence to obtain an optimized secondary spreading code; aiming at the signal after the secondary spread spectrum of the direct sequence spread spectrum signal combined with the long code and the short code, firstly, the short code signal is captured and tracked, and the signal time synchronization is carried out through the secondary spread spectrum code to guide the capture of the long code signal.
The short code signal is usually short in period, generally 1ms, 2ms or 5ms, and the periodicity thereof causes the power spectrum to be composed of discrete power spectral lines, so that the interference resistance of the signal is greatly affected when single-frequency interference overlaps with the spectrum of the short code signal. The acquisition of the long code signal requires the guidance of the short code signal, but the weak anti-interference capability of the short code signal makes the short code signal almost unable to complete guidance under the countermeasure condition. The method for guiding and capturing the long code signal by the short code signal provided by the embodiment performs secondary spread spectrum design on the direct sequence spread spectrum signal combined by the long code and the short code, improves the power spectrum shape of the short code signal, is favorable for improving the guiding capability of the short code signal for capturing the long code signal, greatly improves the anti-interference capability of the short code signal, and has very good practical value under the actual complex countermeasure condition.
It will be appreciated that the short code signal periods in conventional signals are typically short, which periodicity results in a power spectrum consisting of discrete power spectral lines, which are resistant to multiple access and limited in interference rejection. The short code signal provides coarse timing information for the long code signal, and thus the short code signal cannot provide guidance information for the acquisition of the long code when the short code signal demodulates the error code under the conditions of strong multiple access interference and strong countermeasure.
In the embodiment, a secondary spread spectrum design is performed on a direct sequence spread spectrum signal combined by a long code and a short code, the secondary spread spectrum refers to that a primary secondary spread spectrum code is further modulated on the basis of a short code signal sequence, the chip duration of the secondary spread spectrum code is usually one period length of the short code sequence, the code sequence of the secondary spread spectrum code is optimally designed according to the cross-correlation isolation degree of the short code signal, the power spectrum line of the short code signal is denser after the secondary spread spectrum, and the narrow-band interference resistance of the short code signal can be effectively improved.
The short code cross-correlation isolation degree represents the degree of cross-correlation interference between multi-user signals, and can be divided into the cross-correlation isolation degrees of two stages of acquisition and tracking from the aspect of signal processing, the code cross-correlation isolation degrees of the acquisition stage and the tracking stage are different, all pseudo code phases need to be searched in the acquisition stage, and at the moment, the code cross-correlation isolation degree depends on the cross-correlation values of all relative code phase delays; in the tracking stage, the relative time delay difference between the local signal and other signals is small, and the short code cross-correlation isolation degree in the tracking stage depends on the pseudo code cross-correlation value in the maximum relative time delay range.
By TperiodRepresenting the period of repetition of the pseudo-code sequence, TsecondIndicating the repetition period, T, of the secondary spreading codeΔDRepresenting the maximum relative time delay, T, between different user signalssepRepresenting the time delay range in which the isolation needs to be considered, the code cross-correlation isolation expression is shown as follows:
wherein, C (T) represents the composite code of pseudo code sequence after secondary frequency spreading, and in the acquisition stage, TsepRepetition period T taking the value of the second spreadingsecondIn the tracking phase, the maximum relative time delay T of different user signals is taken as the valueΔD。
In the acquisition stage, all code phases need to be searched, and the cross-correlation isolation of the secondary spreading codes depends on the maximum value of the cross-correlation under all code phase delays and is marked as R1(ii) a In the tracking stage, the maximum transmission time delay of each path of uplink injection signal received by the satellite is TΔDWhen the cross-correlation isolation of the secondary spreading codes depends on the relative delay at TΔDMaximum value of the inter-correlation, denoted R2。
The basic preferred principle of the secondary spreading code is as follows: ensuring R1、R2Is less than a threshold value epsilon1、ε2. Specific epsilon1And epsilon2The lower limit of (3) is not related to theoretical analysis at present, and in this embodiment, a genetic algorithm is adopted to perform random search on the secondary spreading codes, so as to search the secondary spreading code sequences meeting the above requirements.
The genetic algorithm is a randomized search method which is evolved by taking advantage of the evolution law (survival of suitable persons, and dominant and subordinate genetic mechanisms) of the biological world, and is mainly characterized in that a structural object is directly operated, the derivation and the limitation of function continuity do not exist, the method has the inherent implicit parallelism and better global optimization capability, the optimized search space can be automatically obtained and guided by adopting a probabilistic optimization method, the search direction is self-adaptively adjusted, and no determined rule is needed.
After the secondary spread spectrum codes are synchronized, the time of receiving signals is aligned with the repetition period time of integral multiple secondary spread spectrum codes, so that only a few points of pseudo code phases need to be searched and judged within the time-keeping precision range of a receiver, and the calculation complexity of long code acquisition is reduced. Under the condition of adopting the secondary spread spectrum code, under the condition of partial secondary spread spectrum code error code, the time estimation error of the received signal can not be caused, so that compared with the traditional implementation mode of the text message, the method has higher robustness and safety.
The length of the secondary spread spectrum code affects various indexes including code isolation, long code signal guide capture computation complexity and synchronization time of the secondary spread spectrum code, and the shorter the length of the secondary spread spectrum code is, the worse the isolation performance of the short code after the secondary spread spectrum is, the requirement of R can be met1、R2Less than a threshold value epsilon1、ε2The less the sequence of the code sequence is, the more the pseudo code phases which need to be searched and judged after the secondary spread spectrum synchronization are, the higher the calculation complexity is, but the shorter the time needed for realizing the secondary spread spectrum code synchronization is; conversely, the longer the secondary spreading code length is, the better the short code isolation performance is, the fewer the pseudo code phases which need to be searched and judged after the secondary spreading synchronization are, the lower the long code signal guide acquisition computation complexity is, and the longer the time needed for realizing the secondary spreading code synchronization is, so that the secondary spreading code length should be comprehensively selected according to the requirements of the receiver on the indexes.
In the process of signal receiving, firstly, the short code signal is captured and tracked, and the secondary spread spectrum code of the short code signal is utilized to carry out signal time synchronization, so that the pseudo code phase searching range of the long code signal is narrowed, and the long code signal is guided to be captured.
In one embodiment, a first signal is obtained, the first signal is a long code short code combined direct sequence spread spectrum signal; performing secondary spread spectrum on the basis of the short code signal spread spectrum sequence of the first signal to obtain a secondary spread spectrum code, modulating the secondary spread spectrum code on the primary spread spectrum code sequence, wherein the chip width of the secondary spread spectrum code is equal to the period of the primary spread spectrum code; optimally designing the secondary spread spectrum code according to the code isolation; selecting the length of a secondary spread spectrum code sequence according to the index requirement of a receiver; and capturing the short code signal, and performing signal time synchronization by using a secondary spread spectrum code to guide the capture of the long code signal of the first signal. The method for guiding and capturing the long code signal by the short code signal is favorable for improving the guiding capability of the short code signal for capturing the long code signal, greatly improves the anti-interference capability of the short code signal, and has good practical value under the actual complex confrontation condition.
In one embodiment, a first signal is obtained, the first signal is a long code short code combined direct sequence spread spectrum signal; performing secondary spread spectrum on the basis of the short code signal spread spectrum sequence of the first signal to obtain a secondary spread spectrum code; optimally designing a secondary spread spectrum code according to the code isolation, analyzing a relative time delay range of the code isolation aiming at two stages of capturing and tracking a short code signal, and searching a sequence of the secondary spread spectrum code meeting the requirement through a genetic algorithm in the relative time delay range; selecting the length of a secondary spread spectrum code sequence according to the index requirement of a receiver; and capturing the short code signal, and performing signal time synchronization by using a secondary spread spectrum code to guide the capture of the long code signal of the first signal. The method for guiding and capturing the long code signal by the short code signal improves the anti-interference capability of the short code signal and improves the capturing capability of the short code signal for guiding the long code.
In one embodiment, the sequence length of the secondary spreading code is selected in combination with the code isolation, the pilot acquisition computation complexity of the long code signal, and the synchronization time of the secondary spreading code. The length of the secondary spread spectrum code affects various indexes, including code isolation, long code signal guide capture computation complexity and secondary spread spectrum code synchronization time, the shorter the length of the secondary spread spectrum code is, the worse the short code isolation performance after secondary spread spectrum is, the more pseudo code phases which need to be searched and judged after secondary spread spectrum synchronization are, the higher the computation complexity is, but the shorter the time needed for realizing the secondary spread spectrum code synchronization is; on the contrary, the better the short code isolation performance, the lower the long code signal guiding capture computation complexity, and the longer the time required for realizing the secondary spread spectrum code synchronization. Therefore, the length of the secondary spreading code should be selected comprehensively according to the requirement of the receiver on the index.
In one embodiment, the time for receiving the short code signal by the receiver comprises an integral multiple of the time of the repetition period of the secondary spreading code, so as to reduce the pseudo code phase of the search decision and reduce the computation complexity of the acquisition of the long code signal. After the secondary spread spectrum codes are synchronized, the time of receiving signals is aligned with the repetition period time of integral multiple secondary spread spectrum codes, so that only a few points of pseudo code phases need to be searched and judged within the time-keeping precision range of a receiver, and the calculation complexity of long code acquisition is reduced. Under the condition of adopting the secondary spread spectrum code, under the condition of partial secondary spread spectrum code error code, can not lead to the received signal time to estimate the mistake, consequently compare in the realization mode of traditional text message, can effectively promote the stability and the security of data processing process, promote the efficiency of data processing, use short code signal to guide better and catch long code signal.
In an embodiment, the code isolation is calculated according to a pseudo code sequence repetition period, a time delay range and a composite code of the pseudo code sequence after secondary spread spectrum.
The invention also provides a system for guiding and capturing the long code signal by the short code signal, which comprises: the short code signal and the long code signal are guided to acquire by the method, and the method is characterized in that the short code signal and the long code signal are guided to acquire by the method.
Furthermore, an embodiment of the present invention also provides a computer-readable storage medium storing computer-executable instructions for execution by one or more control processors, e.g., the control processors are capable of performing steps S110 to S150 of the method of fig. 1.
One of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the foregoing and various other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention.
Claims (6)
1. A method for guiding and capturing a long code signal by a short code signal is characterized by comprising the following steps:
acquiring a first signal, wherein the first signal is a direct sequence spread spectrum signal combined by a long code and a short code;
performing secondary spread spectrum on the basis of the short code signal spread spectrum sequence of the first signal to obtain a secondary spread spectrum code of the short code signal;
and optimally designing the secondary spreading codes according to the code isolation, which comprises the following steps: the secondary spread spectrum code is modulated on the primary spread spectrum code sequence, and the chip width of the secondary spread spectrum code is equal to the period of the short code signal spread spectrum sequence;
selecting the sequence length of the secondary spread spectrum code according to the index requirement of a receiver to obtain the optimized secondary spread spectrum code, and the method comprises the following steps: selecting the sequence length of the secondary spreading code by combining the code isolation, the guided capture computation complexity of the long code signal and the synchronization time of the secondary spreading code;
and capturing the short code signal, performing signal time synchronization by using the optimized secondary spread spectrum code, and guiding to capture the long code signal of the first signal.
2. The method for pilot capture of a long code signal by a short code signal according to claim 1, wherein said spreading twice on the basis of the short code signal spreading sequence of the first signal to obtain the secondary spreading code of the short code signal, comprises the steps of:
the secondary spread spectrum code is modulated on the primary spread spectrum code sequence, and the chip width of the secondary spread spectrum code is equal to the period of the short code signal spread spectrum sequence.
3. The method for pilot-acquisition of a long-code signal by a short-code signal according to claim 1, wherein the signal time synchronization is performed by using the optimized secondary spreading code to pilot-acquire the long-code signal of the first signal, comprising the steps of:
the time for receiving the short code signal by the receiver comprises integral multiple of the repetition period time of the secondary spread spectrum code.
4. The method for pilot capture of a long code signal by a short code signal according to claim 1, wherein the code isolation is calculated by a pseudo code sequence repetition period, a time delay range, and a composite code of the pseudo code sequence after secondary spreading.
5. A system for guided acquisition of a short code signal over a long code signal, comprising: memory, processor and computer program stored on the memory and executable on the processor, characterized in that the processor implements the method of guided acquisition of a long code signal by a short code signal as claimed in any one of claims 1 to 4 when executing the computer program.
6. A computer-readable storage medium storing computer-executable instructions for causing a computer to perform the method of pilot acquisition of a long code signal by a short code signal as claimed in any one of claims 1 to 4.
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