CN111537986B - Signal capturing method and device - Google Patents
Signal capturing method and device Download PDFInfo
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- CN111537986B CN111537986B CN202010414605.0A CN202010414605A CN111537986B CN 111537986 B CN111537986 B CN 111537986B CN 202010414605 A CN202010414605 A CN 202010414605A CN 111537986 B CN111537986 B CN 111537986B
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/35—Details of non-pulse systems
- G01S7/352—Receivers
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Abstract
The embodiment of the invention provides a signal capturing method and a signal capturing device, which are used for determining a plurality of frequencies to be detected and a plurality of phases to be detected; generating a plurality of sets to be detected; each set to be detected comprises a plurality of combinations to be detected, and each combination to be detected comprises a frequency to be detected and a phase to be detected; aiming at a current set to be detected, taking a frequency to be detected and a phase to be detected which are contained in each combination to be detected in the set to be detected, carrying out preset signal capture operation on a received signal to obtain a first operation value of each combination to be detected, and judging whether a carrier frequency and a pseudo-random noise code phase can be captured or not according to the first operation value; if not, starting to detect the next set to be detected; if so, determining the frequency corresponding to the maximum first operation value as the captured target frequency, and determining the phase corresponding to the maximum first operation value as the captured target phase. The accuracy of the captured carrier frequency and pseudo-random noise code phase can be improved.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a signal acquisition method and apparatus.
Background
For spread spectrum signal ranging systems, signal acquisition is a prerequisite for signal processing by the receiver. The signal acquisition process is to obtain a rough estimate of the carrier frequency and the pseudo random noise code (PRN) phase of a received signal, and to provide necessary parameters and conditions for initialization of a subsequent tracking link.
In the signal capturing process, a good detection and judgment method is crucial to the capturing performance.
However, with the existing signal acquisition method, the acquired carrier frequency and pseudo-random noise code phase are not accurate enough.
Disclosure of Invention
The embodiment of the invention aims to provide a signal capturing method and a signal capturing device so as to improve the accuracy of captured carrier frequency and pseudo-random noise code phase.
In order to achieve the above object, an embodiment of the present invention provides a signal acquisition method applied to a receiver, where the method includes:
determining a plurality of frequencies to be detected according to a preset frequency detection range and a preset frequency step length; determining a plurality of phases to be detected according to a preset pseudo-random noise code phase detection range and a preset phase step length;
generating a plurality of sets to be detected according to the frequency to be detected and the phase to be detected; each set to be detected comprises a plurality of combinations to be detected, and each combination to be detected comprises a frequency to be detected and a phase to be detected;
aiming at a current set to be detected, taking a frequency to be detected and a phase to be detected which are contained in each combination to be detected in the set to be detected, carrying out preset signal capture operation on a received signal to obtain a first operation value of each combination to be detected, and judging whether a carrier frequency and a pseudo-random noise code phase can be captured or not according to the first operation value; the preset signal capturing operation comprises cross fuzzy function operation and coherent integration operation;
if not, starting to detect the next set to be detected;
if so, determining the frequency corresponding to the maximum first operation value as the captured target frequency, and determining the phase corresponding to the maximum first operation value as the captured target phase.
Optionally, the step of determining whether the carrier frequency and the pseudo random noise code phase can be captured according to the first operation value includes:
determining a maximum first operation value;
judging whether the maximum first value is larger than a threshold value, if so, capturing a carrier frequency and a pseudo-random noise code phase;
if not, the carrier frequency and the pseudo random noise code phase are not captured;
wherein the threshold value is determined based on the following formula:
wherein U represents the threshold value, T represents a preset coefficient, B f Representing the number of said frequencies to be detected, B c Representing the number of the phases to be detected, k representing the serial number of the combination to be detected, P k Representing a first calculated value, k, of the kth combination to be detected m And indicating the serial number of the combination to be detected corresponding to the maximum first operation value.
Optionally, if the carrier frequency and the pseudo random noise code phase can be captured, the method further includes:
determining multiple re-detection frequencies according to the target frequency and a preset re-detection frequency step length;
determining a re-detection set according to the target phase and the re-detection frequency, wherein the re-detection set comprises a plurality of re-detection combinations, and each re-detection combination comprises the target phase and one re-detection frequency;
taking a target phase and a redetection frequency contained in each redetection combination in the redetection set, performing the signal acquisition operation on the target phase and the redetection frequency and the received signal to obtain a second operation value of each redetection combination, and judging whether the carrier frequency and the pseudo-random noise code phase can be acquired in a redetection stage according to the second operation value of each redetection combination;
if not, starting to detect the next set to be detected;
and if so, determining the frequency corresponding to the maximum second operation value of the re-detection combination as the target frequency captured in the re-detection stage.
Optionally, there are a plurality of pseudo random noise codes to be detected, where each pseudo random noise code corresponds to a pseudo random noise code number, and the method further includes:
and detecting the to-be-detected sets corresponding to the pseudo-random noise codes of other code numbers, and determining a final signal acquisition result based on the detection result of each pseudo-random noise code.
In order to achieve the above object, an embodiment of the present invention further provides a signal acquisition apparatus, applied to a receiver, where the apparatus includes:
the first determining module is used for determining a plurality of frequencies to be detected according to a preset frequency detection range and a preset frequency step; determining a plurality of phases to be detected according to a preset pseudo-random noise code phase detection range and a preset phase step length;
the generating module is used for generating a plurality of sets to be detected according to the frequency to be detected and the phase to be detected; each set to be detected comprises a plurality of combinations to be detected, and each combination to be detected comprises a frequency to be detected and a phase to be detected;
the judging module is used for taking the frequency to be detected and the phase to be detected contained in each combination to be detected in the set to be detected, performing preset signal capture operation on the frequency to be detected and the phase to be detected with a received signal to obtain a first operation value of each combination to be detected, and judging whether the carrier frequency and the pseudo-random noise code phase can be captured or not according to the first operation value; the preset signal capturing operation comprises cross fuzzy function operation and coherent integration operation;
the first detection module is used for starting to detect the next set to be detected when the judgment result of the judgment module is negative;
and the second determining module is used for determining the frequency corresponding to the maximum first operation value as the captured target frequency and determining the phase corresponding to the maximum first operation value as the captured target phase when the judgment result of the judging module is yes.
Optionally, the determining module is specifically configured to:
determining a maximum first operation value;
judging whether the maximum first value is larger than a threshold value, if so, capturing a carrier frequency and a pseudo random noise code phase;
if not, it means that the carrier frequency and the pseudo random noise code phase are not captured;
wherein the threshold value is determined based on the following formula:
wherein U represents the threshold value, T represents a preset coefficient, B f Representing the number of said frequencies to be detected, B c Representing the number of the phases to be detected, k representing the serial number of the combination to be detected, P k Representing a first calculated value, k, of the kth combination to be detected m And indicating the serial number of the combination to be detected corresponding to the maximum first operation value.
Optionally, the apparatus further comprises: a redetection module, the redetection module specifically configured to:
if the carrier frequency and the pseudo-random noise code phase can be captured, determining multiple re-detection frequencies according to the target frequency and a preset re-detection frequency step length;
determining a re-detection set according to the target phase and the re-detection frequency, wherein the re-detection set comprises a plurality of re-detection combinations, and each re-detection combination comprises the target phase and one re-detection frequency;
taking a target phase and a redetection frequency contained in each redetection combination in the redetection set, performing the signal capture operation on the target phase and the redetection frequency and the received signal to obtain a second operation value of each redetection combination, and judging whether the carrier frequency and the pseudo-random noise code phase can be captured in the redetection stage or not according to the second operation value of each redetection combination;
if not, starting to detect the next set to be detected;
and if so, determining the frequency corresponding to the maximum second calculation value of the re-detection combination as the target frequency captured in the re-detection stage.
Optionally, the apparatus further includes: a second detection module to:
and detecting a to-be-detected set corresponding to the pseudo-random noise codes of other code numbers, and determining a final signal acquisition result based on the detection result of each pseudo-random noise code.
In order to achieve the above object, an embodiment of the present invention further provides an electronic device, including a processor, a communication interface, a memory, and a communication bus; the processor, the communication interface and the memory complete mutual communication through a communication bus;
a memory for storing a computer program;
and the processor is used for realizing any method step when executing the program stored in the memory.
To achieve the above object, an embodiment of the present invention further provides a computer-readable storage medium, in which a computer program is stored, and the computer program, when executed by a processor, implements any of the above method steps.
The embodiment of the invention has the following beneficial effects:
by applying the signal capturing method and the signal capturing device provided by the embodiment of the invention, a plurality of frequencies to be detected can be determined according to the preset minimum carrier frequency and the preset frequency step; determining a plurality of phases to be detected according to a preset minimum pseudo-random noise code phase and a preset phase step; generating a plurality of sets to be detected according to the frequency to be detected and the phase to be detected; each set to be detected comprises a plurality of combinations to be detected, and each combination to be detected comprises a frequency to be detected and a phase to be detected; aiming at a current set to be detected, taking a frequency to be detected and a phase to be detected which are contained in each combination to be detected in the set to be detected, carrying out preset signal capture operation on the frequency to be detected and a received signal to obtain a first operation value of each combination to be detected, and judging whether a carrier frequency and a pseudo-random noise code phase can be captured or not according to the first operation value; the preset signal capturing operation comprises cross fuzzy function operation and coherent integration operation; if not, starting to detect the next set to be detected; if so, determining the frequency corresponding to the maximum first operation value as the captured target frequency, and determining the phase corresponding to the maximum first operation value as the captured target phase. Therefore, the combination of the frequency to be detected and the phase to be detected is divided into a plurality of sets to be detected, the frequency and the phase in each set to be detected are detected in sequence, and compared with a signal capturing scheme without block detection, the accuracy of the captured carrier frequency and the pseudo-random noise code phase can be improved.
Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a signal acquisition method according to an embodiment of the present invention;
FIG. 2 is a diagram of a search field and a search block according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a signal acquisition operation according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a signal acquisition method according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a transfer process between different search blocks in a signal acquisition process according to an embodiment of the present invention;
FIG. 6(a) is a diagram illustrating a transition function of state transition between H0 search blocks according to an embodiment of the present invention;
FIG. 6(b) is a diagram illustrating a transition function of the H1 search block to the H0 search block according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a signal capturing device according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to improve the accuracy of an acquired carrier frequency and a pseudo-random noise code phase, embodiments of the present invention provide a signal acquisition method, apparatus, electronic device, and computer-readable storage medium.
The embodiment of the invention can be applied to a spread spectrum signal ranging system. For a spread spectrum signal ranging system, a receiver needs to acquire a signal first after receiving the signal. The signal acquisition process is a process of estimating the carrier frequency and the pseudo-random noise code phase of the received signal. Wherein the phase of the pseudo random noise code can also be understood as the delay of the pseudo random noise code.
Referring to fig. 1, fig. 1 is a schematic flow chart of a signal acquisition method according to an embodiment of the present invention, where the method includes:
s101: determining a plurality of frequencies to be detected according to a preset frequency detection range and a preset frequency step length; and determining a plurality of phases to be detected according to a preset pseudo-random noise code phase detection range and a preset phase step.
For ease of reference, the frequencies referred to herein are carrier frequencies and the phases referred to are pseudo-random noise code phases.
In the embodiment of the invention, the receiver can locally generate a plurality of frequencies to be detected and phases to be detected.
Specifically, the receiver may preset a frequency detection range and a frequency detection step size.
For example, if the set frequency detection range is-3000 Hz to 3000Hz, and the frequency detection step is 100Hz, there are 61 frequencies to be detected in total, and the frequencies to be detected are-3000 Hz, -2900Hz, …, 2900Hz, and 3000 Hz.
Accordingly, a plurality of phases to be detected can be determined in the same manner.
S102: generating a plurality of sets to be detected according to the frequency to be detected and the phase to be detected; each set to be detected comprises a plurality of combinations to be detected, and each combination to be detected comprises a frequency to be detected and a phase to be detected.
In the embodiment of the invention, any phase to be detected and a frequency to be detected can form a combination to be detected.
The signal acquisition process may be understood as finding a target combination from the combinations to be detected, where the frequency to be detected and the phase to be detected in the target combination are respectively closest to the carrier frequency of the received signal and the phase of the pseudo-random noise code.
In the embodiment of the present invention, in order to better detect the frequency and the phase that are closest to the carrier frequency and the code phase of the received signal, a plurality of sets to be detected may be generated according to the frequency to be detected and the phase to be detected. Each set to be detected comprises a plurality of combinations to be detected, and each combination to be detected comprises a frequency to be detected and a phase to be detected.
For ease of understanding, referring to fig. 2, all combinations to be detected can be represented as search domains, each set to be detected can be represented as a search block, and each combination to be detected can be represented as a cell in the search block.
The cells appearing hereinafter all represent a combination to be detected, and the search blocks appearing hereinafter all represent a set to be detected.
In the embodiment shown in fig. 2, the first search block relates to 4 frequencies, frequency 1, frequency 2, frequency 3 and frequency 4; the first search block involves 3 phases, phase 1, phase 2 and phase 3 respectively. There are 12 combinations of these frequencies and phases to be detected, corresponding to 12 cells in the first search block. For example, the upper left cell corresponds to the combination to be detected of frequency 1 and phase 1.
For the second search block, the third search block, and the fourth search block, details are not repeated, and reference may be made to the related description of the first search block.
In the embodiment shown in fig. 2, there are 8 frequencies to be detected and 6 phases to be detected. Each search block is equivalent to a set to be detected, 4 search blocks form a search domain, and the search domain can contain all combinations of frequencies to be detected and phases to be detected.
Those skilled in the art can understand that the embodiment of fig. 2 is only used as an example, the number of the frequency to be detected and the phase to be detected, and the division of the search block may be set according to actual requirements, which is not limited in the embodiment of the present invention.
S103: aiming at a current set to be detected, taking a frequency to be detected and a phase to be detected which are contained in each combination to be detected in the set to be detected, carrying out preset signal capture operation on a received signal to obtain a first operation value of each combination to be detected, and judging whether a carrier frequency and a pseudo-random noise code phase can be captured or not according to the first operation value; the preset signal capturing operation comprises cross fuzzy function operation and coherent integration operation. If not, executing S104; if yes, go to step S105.
In the embodiment of the invention, each set to be detected can be sequentially detected according to the sequence. For example, a set to be detected corresponding to a first search block is detected first, and if the carrier frequency and the pseudo-random noise code phase can be captured, signal capture is completed; otherwise, the detection of the to-be-detected set corresponding to the second search block is started. And so on.
The following describes a process of detecting a certain set to be detected.
In the embodiment of the invention, for the current set to be detected, the frequency to be detected and the phase to be detected included in each combination to be detected in the set to be detected can be taken, and preset signal capture operation is performed on the frequency to be detected and the phase to be detected and received signals, so that a first operation value of each combination to be detected is obtained.
The preset signal acquisition operation is a common operation in the field of signal acquisition, and may include cross-ambiguity function operation and coherent integration operation. Referring to fig. 3, a specific operation process is shown, and fig. 3 is a schematic diagram of a preset signal capture operation according to an embodiment of the present invention. For a specific signal capturing operation process, reference may be made to related technologies, which are not described in detail herein.
In the embodiment of the present invention, the operation value is P MF (τ e ,f e ) Is shown, wherein, tau e Representing the difference between the phase to be detected and the true code phase of the received signal, f e Representing the difference between the frequency to be detected and the true carrier frequency of the received signal. Tau is e And f e The smaller the computed value P MF (τ e ,f e ) The larger, and therefore the more can be based on the respective calculated value P MF (τ e ,f e ) The magnitude relationship between the pseudo-random noise code and the carrier frequency is determined whether to capture the pseudo-random noise code phase.
In the process of detecting the to-be-detected set corresponding to the first search block, taking the frequencies and phases of the 12 to-be-detected combinations respectively, and performing the preset signal capturing operation on the frequencies and phases and the received signals to obtain 12 first operation values P according to the example shown in fig. 2 MF . If the first operation value corresponding to the frequency 2 and the phase 2 is significantly greater than the first operation values of other combinations to be detected, it can be considered that the frequency 2 is closest to the carrier frequency of the received signal, and the phase 2 is closest to the phase of the pseudo random noise code of the received signal. This situation indicates that the carrier frequency and pseudo-random noise code phase can be captured.
On the contrary, if the difference between the calculated 12 operation values is small, it can be considered that the set to be detected does not include a frequency and a phase which are relatively close to the carrier frequency of the received signal and the phase of the pseudo random noise code, that is, the carrier frequency and the phase of the pseudo random noise code cannot be captured.
S104: and starting to detect the next set to be detected.
In the embodiment of the invention, if the carrier frequency and the pseudo-random noise code phase cannot be captured in the current set to be detected, the next set to be detected can be detected.
The detection sequence of the sets to be detected can be set according to the actual situation, and is not limited.
S105: the frequency corresponding to the largest first operation value is determined as the captured target frequency, and the phase corresponding to the largest first operation value is determined as the captured target phase.
In the embodiment of the present invention, if the carrier frequency and the pseudo random noise code phase can be captured, the frequency corresponding to the largest first operation value may be determined as the captured target frequency, and the phase corresponding to the largest first operation value may be determined as the captured target phase. The target frequency is the carrier frequency of the received signal captured in the signal capturing process, and the target phase is the pseudo-random phase code phase of the received signal captured in the signal capturing process.
By applying the signal capturing method provided by the embodiment of the invention, a plurality of frequencies to be detected can be determined according to the preset minimum carrier frequency and the preset frequency step; determining a plurality of phases to be detected according to a preset minimum pseudo-random noise code phase and a preset phase step; generating a plurality of sets to be detected according to the frequency to be detected and the phase to be detected; each set to be detected comprises a plurality of combinations to be detected, and each combination to be detected comprises a frequency to be detected and a phase to be detected; aiming at a current set to be detected, taking a frequency to be detected and a phase to be detected which are contained in each combination to be detected in the set to be detected, carrying out preset signal capture operation on the frequency to be detected and a received signal to obtain a first operation value of each combination to be detected, and judging whether a carrier frequency and a pseudo-random noise code phase can be captured or not according to the first operation value; the preset signal capturing operation comprises cross fuzzy function operation and coherent integration operation; if not, starting to detect the next set to be detected; if so, determining the frequency corresponding to the maximum first operation value as the captured target frequency, and determining the phase corresponding to the maximum first operation value as the captured target phase. Therefore, the combination of the frequency to be detected and the phase to be detected is divided into a plurality of sets to be detected, the frequency and the phase in each set to be detected are detected in sequence, and compared with a signal capturing scheme without block detection, the accuracy of captured carrier frequency and pseudo-random noise code phase can be improved.
In an embodiment of the present invention, the step of determining whether the carrier frequency and the pseudo random noise code phase can be captured according to the first operation value may specifically include the following refining steps:
step a 1: a maximum first operation value is determined.
Step a 2: judging whether the maximum first operation value is larger than a threshold value, if so, capturing the phases of the carrier wave and the pseudo-random noise code; if not, it means that the carrier frequency and the pn code phase are not captured.
Wherein the threshold value may be determined based on the following formula:
wherein U represents a threshold value, T represents a preset coefficient, B f Representing the number of frequencies to be detected, B c Representing the number of phases to be detected, k representing the number of combinations to be detected, P k Representing a first calculated value, k, of the kth combination to be detected m And indicating the serial number of the combination to be detected corresponding to the maximum first operation value.
In this way, in the embodiment of the present invention, for one set to be detected, the largest first operation value is removed, the first operation values of the remaining other combinations to be detected are averaged and multiplied by the preset coefficient, and the obtained value is used as the threshold value of the set to be detected. When the maximum first operation value is greater than the threshold value, it can be considered that the frequency and the phase corresponding to the maximum first operation value are close to the carrier frequency and the pseudo random noise code phase of the received signal, respectively, that is, the carrier frequency and the pseudo random noise code phase can be captured, the captured carrier frequency is the frequency corresponding to the maximum first operation value, and the captured pseudo random noise code phase is the phase corresponding to the maximum first operation value.
Otherwise, when the maximum first operation value is not greater than the threshold value, the carrier frequency and the pseudo-random noise code phase cannot be captured in the set to be detected corresponding to the search block.
Therefore, in the embodiment of the present invention, for each set to be detected, the threshold of the set to be detected is calculated by using the above formula, and whether the carrier frequency and the pseudo random noise code phase can be captured is determined according to the magnitude relationship between the maximum first calculation value and the threshold. The threshold value of the set to be detected is dynamically calculated according to each first operation value of the combination to be detected in the set, so that even if part of the first operation values are deviated due to noise interference, the judgment result is not greatly influenced, that is, the negative influence of interference noise fluctuation on signal capture can be reduced, and the signal capture capability under weak signals can be improved.
In an embodiment of the present invention, in order to further improve the accuracy of the acquired frequency and phase and to reduce the time consumption and resource consumption caused by acquiring the wrong frequency and phase as much as possible, a dual detection mode, which may also be referred to as dual dwell detection, may be adopted.
Specifically, if a carrier frequency and a pseudorandom noise code phase can be captured in a certain set to be detected in the first detection process, the set is subjected to second detection.
Referring to fig. 4, fig. 4 is a schematic flow chart of a signal acquisition method according to an embodiment of the present invention. After S105, the second detection process specifically includes the following steps:
s401: and determining a plurality of re-detection frequencies according to the target frequency and a preset re-detection frequency step length.
In the embodiment of the invention, as the requirement of the signal acquisition process on the phase precision is not high, in the re-detection stage, the target phase acquired in the first detection can be kept, and only the frequency is changed, so as to obtain more accurate frequency estimation.
Specifically, the multiple re-detection frequencies may be determined according to the target frequency and a preset re-detection frequency step. Wherein the re-detected frequency step can be set smaller than the frequency step of the first detection process.
As an example, multiple re-detection frequencies may be generated with the target frequency obtained by the first detection as the center and the frequency step of the re-detection as the frequency interval.
S402: and determining a re-detection set according to the target phase and the re-detection frequency, wherein the re-detection set comprises a plurality of re-detection combinations, and each re-detection combination comprises the target phase and one re-detection frequency.
In the embodiment of the present invention, in the re-detection stage, only one re-detection set is generated, where the re-detection set includes multiple re-detection combinations, the phases in the re-detection combinations are all the target phases captured in the first detection, and the frequency is the re-detection frequency generated in step S401.
S403: and taking the target phase and the re-detection frequency contained in each re-detection combination in the re-detection set, performing signal capture operation on the target phase and the re-detection frequency and the received signal to obtain a second operation value of each re-detection combination, and judging whether the carrier frequency and the pseudo-random noise code phase can be captured in the re-detection stage according to the second operation value of each re-detection combination. If not, executing S404; if yes, go to step S405.
S404: and starting to detect the next set to be detected.
S405: and determining the frequency corresponding to the maximum second operation value of the re-detection combination as the target frequency captured in the re-detection stage.
In the embodiment of the present invention, the process of performing signal acquisition operation on the frequency and the phase in S403 and the received signal may refer to the related description of S103, which is not described herein again. In order to distinguish the first detection process, in the re-detection process, the operation result of the signal capture operation is expressed by the second operation value.
In addition, in S403, the process of determining whether the carrier frequency and the pseudorandom noise code phase can be captured in the re-detection stage according to the second operation value of each re-detection combination may also refer to the first detection process, which is not described herein again.
In the embodiment of the invention, under the condition that the carrier frequency and the pseudo random noise code phase can be captured, the signal is captured for the second time, in the process of capturing the signal for the second time, a new re-detection frequency is generated, whether the carrier frequency and the pseudo random noise code phase can be captured for the second time or not is judged according to the same mode of capturing the signal for the first time, and if the carrier frequency and the pseudo random noise code phase can be captured for the second time, the carrier frequency captured for the second time is used as a final capturing result. And if the carrier frequency and the pseudo-random noise code phase are not captured for the second time, considering that the signal capture for the first time is wrong, and starting to detect the next set to be detected. Therefore, by adopting a double detection mechanism, only if the first signal acquisition and the second signal acquisition can acquire the carrier frequency and the pseudo-random noise code phase, the signal acquisition result is determined. Therefore, the error of the first signal capture can be found in the re-detection process, and the accuracy of the signal capture can be further improved.
In one embodiment of the invention, there may be a plurality of pseudo random noise codes to be detected, each pseudo random noise code corresponding to a pseudo random noise code number.
The embodiments shown in fig. 1 to 4 are all signal acquisition performed for one pseudo random noise code, and if there are a plurality of pseudo random noise codes to be detected, a to-be-detected set corresponding to pseudo random noise codes of other code numbers can be detected in the same manner, and the detection result of each pseudo random noise code is synthesized to determine the final signal acquisition result.
For ease of understanding, the signal capturing method provided by the embodiment of the present invention is further described below with reference to fig. 5, fig. 6(a), and fig. 6 (b).
First, the definitions of H0 cells, H1 cells, H0 search blocks, and H1 search blocks are introduced.
In the embodiment of the present invention, the H0 cell is defined as an error cell, and the carrier frequency and the code phase represented by the error cell are greatly different from the carrier frequency and the code phase of the currently received signal. The H1 cell is defined as the correct cell, which represents the carrier frequency and code phase closest to the carrier frequency and code phase of the currently received signal, and it can also be understood that the frequency and code phase corresponding to the H1 cell are the correctly acquired carrier frequency and pseudorandom noise code phase.
It is easily understood that one search block contains at most one H1 cell. The H0 search block is defined as a search block containing only H0 cells, and the H1 search block is defined as a search block containing one H1 cell.
Based on the above definition, the process of signal acquisition is the process of finding the H1 cell.
The following summarizes the types of events that occur during the process of detecting each search block by the receiver.
For the H0 search block, there are two cases: 1) the receiver does not detect the H1 cell, which indicates that the receiver made a correct detection, and the probability is recorded as a positive rate. 2) The receiver detects the H1 cell, which indicates that the receiver made a false detection, and the probability is recorded as a false alarm rate.
For the H1 search block, there are three cases: 1) the receiver detects the correct H1 cell and its probability is recorded as the true alarm rate. 2) The receiver did not detect the H1 cell and its probability was reported as the false alarm rate. 3) The receiver declares that H1 cells were detected, but actually H0 cells, and the probability is reported as the false alarm rate. The first case represents a correct detection by the receiver and the second and third cases represent an incorrect detection by the receiver.
Obviously, the receiver does not determine whether the detection result is accurate during the detection of the search block. And when the receiver captures the carrier frequency and the pseudo-random noise code phase in the re-detection stage, the receiver enters a subsequent tracking state. The receiver can judge whether the captured carrier frequency and the pseudo-random noise code phase are correct or not in the tracking state, and if the captured carrier frequency and the pseudo-random noise code phase are judged to be incorrect, the receiver can break away from the tracking state and return to the signal capturing state again.
Based on the above analysis, a flow chart of the receiver detecting the search block can be seen in fig. 5, and in the embodiment shown in fig. 5, a transfer function is used to represent the transfer process between different search blocks in the signal acquisition process. Different transfer functions represent the probability of different events.
In the embodiment shown in fig. 5, each search block corresponds to one set to be detected, the pth search block is set as an H1 search block, and the other search blocks are all H0 search blocks. H 0 (z) denotes the transfer function between H0 search blocks, H 1 (z) represents the transfer function of the H1 search block to the H0 search block. As shown in FIG. 5, the P-th search block in gray is the H1 search block, H Bd (z) represents the transfer function of the first detection of the occurrence of real alarm, the re-detection is performed after the first detection of the occurrence of real alarm in the P-th search block, F in the gray circle represents the re-detection state, h Bd (z) a transfer function representing an actual alarm event in the re-detection process, Acq a signal capture success state, h 1 (z) a transfer function representing the occurrence of a false alarm event during the re-detection process.
FIG. 6(a) is H 0 (z) a schematic of the transfer function. FIG. 6(b) is H 1 (z) a schematic of the transfer function. Different letters on the transition lines in the figure represent different types of events.
Specifically, for FIG. 6(a), H Bcr Positive and negative events, H, indicating the first detection process Bfa False alarm event, h, indicating the first detection process Bcr Positive and negative events, h, indicating a redetection process Bfa A false alarm event indicative of a second detection process. H p Representing the process events after the occurrence of the false alarm, from the time of entering the subsequent tracking link to the time of identifying the false alarm return acquisition by using the corresponding algorithm. In fig. 6(a), F indicates a first detection end state, and FA indicates a second detection end state.
As shown in fig. 6(a), if rejection occurs at the first detection or re-detection, the search block is shifted to the next search block for detection. If false alarms occur in both the first detection and the re-detection, the receiver will switch to the tracking state based on the estimated value of the false alarm. The receiver can then determine that it is a false alarm by tracking the state, so that the receiver returns to the acquisition state to continue acquisition. And the extra time consumed by the part is called the false alarm penalty time.
For FIG. 6(b), H Bm Alarm-missing event, H, indicating a first detection process Be Indicates the first timeA false alarm event of the process is detected.
For the H1 search block, if the first detection and re-detection are false alarms, the receiver acquisition is successful and transitions to the tracking state. If the first detection or the re-detection fails, the receiver moves to the next search block for detection. If a false alarm occurs in the first detection or re-detection, the receiver will move to the next block for detection after the false alarm penalty time, similar to the false alarm event in the H0 search block. For the H1 block, the latter two cases mean that the receiver cannot achieve signal acquisition.
Then, in the embodiment shown in FIG. 5, H 0 (z) corresponds to the event, H, shown in FIG. 6(a) 1 (z) corresponds to the event shown in FIG. 6 (b). The front P-1 search blocks are all H0 search blocks, and correct carrier waves and phases cannot be captured until a receiver detects the P search block, re-detection is carried out when real alarm occurs in the first detection, and the capture is completed when the real alarm occurs again. If the first detection or re-detection process of the No. P search block generates false alarm, the No. P +1 search block is detected, and under the condition, the receiver cannot correctly capture the carrier frequency and the pseudo-random noise code phase of the received signal.
Fig. 5 shows all the situations that may occur in the receiver during signal acquisition. It is easy to understand that, in the signal acquisition process, the higher the real alarm rate and the lower the false alarm rate, the better the performance of signal acquisition.
The performance of the signal acquisition method provided by the embodiment of the invention is analyzed by the occurrence probability of each event in the signal acquisition process.
Taking the first signal acquisition as an example, the first operation value corresponding to each cell can be regarded as a random variable due to the presence of random interference noise. Assuming that the random variable of the operation value corresponding to the H0 cell is X, the random variable of the operation value corresponding to the H1 cell is Y, and the noise in the received signal is white gaussian noise, the probability density functions of the two random variables can be expressed as follows:
wherein f is X (x) Probability density function of random variable X representing operation value corresponding to H0 cell f Y (Y) a probability density function of a random variable Y representing the operation value corresponding to the H1 cell; gamma (·) is a Gamma function, I 0 (. cndot.) is a first class of zero-order modified Bessel function,
is the noise power, N nc Representing the number of cells, N, within each search block in the search domain n Representing the number of non-coherent integrations and a the amplitude of the desired signal.
Based on the analysis of fig. 5, 6(a), and 6(b), the transfer function can be represented by the following formula:
H 0 (z)＝H Bcr (z)+H Bfa (z)(h Bcr +h Bfa (z)H p (z))
H 1 (z)＝H Bm (z)+H Be (z)(h Bcr +h Bfa (z)H p (z))
h 1 (z)＝h Bm (z)+h Be (z)H p (z)
wherein, P Bd ，P Bm ，P Be ，P Bcr ，P Bfa Respectively corresponding to the real alarm rate, the false alarm rate, the positive alarm rate and the false alarm rate. Subscript 1 indicates the first dwell, i.e., first detection process, and subscript 2 indicates the second dwell, i.e., second detection process, e.g., P Bd1 Indicating the true alarm rate of the first dwell. t is t 1 And t 2 Dwell times, t, for the receiver in the first dwell and the second dwell, respectively p Time is penalized for false alarms.
In addition, since the threshold value of each search block is calculated according to the first operation value corresponding to each cell in the search block, and the first operation value corresponding to each cell is a random variable, the threshold value is also a random variable.
Assuming that the threshold value is U, the probability density function of the random variable U can be represented as:
wherein, B i The number of random variables X involved in the averaging operation is indicated, and i equal to 1 or 2 indicates the first dwell and the second dwell, respectively. The random variable U obeys the shape parameter B i The proportional parameter is
Gamma distribution of (2). T1 is a preset threshold multiple parameter, which can be set according to actual requirements.
Further, the probability of occurrence of different events can be calculated according to the random variable X, Y and the probability density function of U, which is specifically as follows:
P Bei ＝1-P Bdi -P Bmi
P Bfai ＝1-P Bcri
the above is the event probability of the first dwell or the second dwell, and both dwells should be considered jointly for the entire acquisition process. The real alarm rate P of the whole signal acquisition process can be calculated Bd Alarm missing rate P Bm Error rate P Be Positive rejection ratio P Bcr And false alarm rate P Bfa The method comprises the following steps:
P Bd ＝P Bd1 P Bd2
P Bm ＝1-P Bd -P Be
P Be ＝P Be1 P Be2
P Bcr ＝1-P Bfa
P Bfa ＝P Bfa1 P Bfa2
compared with other existing capturing methods, the signal capturing method provided by the embodiment of the invention has the advantages that the rejection rate is higher and the false alarm rate is lower for the H0 search block; for the H1 search block, the true alarm rate is higher and the false alarm rate is lower. Therefore, the detection performance is better. In addition, in a scene that the signal-to-noise ratio changes due to fluctuation of weak signals or noise power, the false alarm rate of the signal capturing method provided by the embodiment of the invention is still maintained in a low state, and the signal capturing method has stable and good detection performance.
Based on the same inventive concept, according to the above signal capturing method embodiment, an embodiment of the present invention further provides a signal capturing apparatus, referring to fig. 7, which may include the following modules:
a first determining module 701, configured to determine multiple frequencies to be detected according to a preset frequency detection range and a preset frequency step; determining a plurality of phases to be detected according to a preset pseudo-random noise code phase detection range and a preset phase step length;
a generating module 702, configured to generate a plurality of sets to be detected according to the frequency to be detected and the phase to be detected; each set to be detected comprises a plurality of combinations to be detected, and each combination to be detected comprises a frequency to be detected and a phase to be detected;
the determining module 703 is configured to, for a current set to be detected, take a frequency to be detected and a phase to be detected that are included in each combination to be detected in the set to be detected, perform preset signal capture operation on a received signal to obtain a first operation value of each combination to be detected, and determine whether a carrier frequency and a pseudo-random noise code phase can be captured according to the first operation value; the preset signal capturing operation comprises cross fuzzy function operation and coherent integration operation;
a first detecting module 704, configured to start detecting a next set to be detected when the determination result of the determining module is negative;
a second determining module 705, configured to determine, when the determination result of the determining module is yes, the frequency corresponding to the largest first operation value as the captured target frequency, and determine the phase corresponding to the largest first operation value as the captured target phase.
In an embodiment of the present invention, the determining module 703 may be specifically configured to:
determining a maximum first operation value;
judging whether the maximum first value is larger than a threshold value, if so, capturing the carrier frequency and the pseudo-random noise code phase;
if not, it means that the carrier frequency and the pseudo random noise code phase are not captured;
wherein the threshold value is determined based on the following formula:
wherein U represents a threshold value, T represents a preset coefficient, B f Representing the number of frequencies to be detected, B c Representing the number of phases to be detected, k representing the serial number of the combination to be detected, P k Representing a first calculated value, k, of the kth combination to be detected m And indicating the serial number of the combination to be detected corresponding to the maximum first operation value.
In an embodiment of the present invention, on the basis of the apparatus shown in fig. 7, a re-detection module may further be included, where the re-detection module may specifically be configured to:
if the carrier frequency and the pseudo-random noise code phase can be captured, determining multiple re-detection frequencies according to the target frequency and a preset re-detection frequency step length;
determining a re-detection set according to the target phase and the re-detection frequency, wherein the re-detection set comprises a plurality of re-detection combinations, and each re-detection combination comprises the target phase and one re-detection frequency;
the target phase and the re-detection frequency contained in each re-detection combination in the re-detection set are taken, signal capture operation is carried out on the target phase and the re-detection frequency and the received signals, a second operation value of each re-detection combination is obtained, and whether the carrier frequency and the pseudo-random noise code phase can be captured in the re-detection stage or not is judged according to the second operation value of each re-detection combination;
if not, starting to detect the next set to be detected;
and if so, determining the frequency corresponding to the maximum second operation value of the re-detection combination as the target frequency captured in the re-detection stage.
In an embodiment of the present invention, there are a plurality of pseudo random noise codes to be detected, where each pseudo random noise code corresponds to a pseudo random noise code number, and on the basis of the apparatus shown in fig. 7, the apparatus may further include:
a second detection module to:
and detecting a to-be-detected set corresponding to the pseudo-random noise codes of other code numbers, and determining a final signal acquisition result based on the detection result of each pseudo-random noise code.
By applying the signal capturing device provided by the embodiment of the invention, a plurality of frequencies to be detected can be determined according to the preset minimum carrier frequency and the preset frequency step; determining a plurality of phases to be detected according to a preset minimum pseudo-random noise code phase and a preset phase step; generating a plurality of sets to be detected according to the frequency to be detected and the phase to be detected; each set to be detected comprises a plurality of combinations to be detected, and each combination to be detected comprises a frequency to be detected and a phase to be detected; aiming at a current set to be detected, taking a frequency to be detected and a phase to be detected which are contained in each combination to be detected in the set to be detected, carrying out preset signal capture operation on a received signal to obtain a first operation value of each combination to be detected, and judging whether a carrier frequency and a pseudo-random noise code phase can be captured or not according to the first operation value; the preset signal capturing operation comprises cross fuzzy function operation and coherent integration operation; if not, starting to detect the next set to be detected; if so, determining the frequency corresponding to the maximum first operation value as the captured target frequency, and determining the phase corresponding to the maximum first operation value as the captured target phase. Therefore, the combination of the frequency to be detected and the phase to be detected is divided into a plurality of sets to be detected, the frequency and the phase in each set to be detected are detected in sequence, and compared with a signal capturing scheme without block detection, the accuracy of the captured carrier frequency and the pseudo-random noise code phase can be improved.
In addition, the threshold value of the set to be detected is dynamically calculated according to each first operation value of the combination to be detected in the set, so that even if part of the first operation values are deviated due to noise interference, the judgment result is not greatly influenced, that is, the negative influence of interference noise fluctuation on signal capture can be reduced, and the signal capture capability under weak signals can be improved.
And under the condition that the carrier frequency and the pseudo-random noise code phase can be captured, performing second signal capture, generating new re-detection frequency in the second signal capture process, judging whether the carrier frequency and the pseudo-random noise code phase can be captured for the second time according to the same mode of the first signal capture, and taking the carrier frequency captured for the second time as a final capture result if the carrier frequency and the pseudo-random noise code phase can be captured for the second time. And if the carrier frequency and the pseudo-random noise code phase are not captured for the second time, considering that the signal capture for the first time is wrong, and starting to detect the next set to be detected. Therefore, by adopting a double detection mechanism, only if the first signal acquisition and the second signal acquisition can acquire the carrier frequency and the pseudo-random noise code phase, the signal acquisition result is determined. Therefore, the error of the first signal capture can be found in the re-detection process, and the accuracy of the signal capture can be further improved.
Based on the same inventive concept, according to the above signal capturing method embodiment, an electronic device is further provided in the invention embodiment, as shown in fig. 8, including a processor 801, a communication interface 802, a memory 803, and a communication bus 804, where the processor 801, the communication interface 802, and the memory 803 complete mutual communication through the communication bus 804.
A memory 803 for storing a computer program;
the processor 801 is configured to implement the following steps when executing the program stored in the memory 803:
determining a plurality of frequencies to be detected according to a preset frequency detection range and a preset frequency step length; determining a plurality of phases to be detected according to a preset pseudo-random noise code phase detection range and a preset phase step length;
generating a plurality of sets to be detected according to the frequency to be detected and the phase to be detected; each set to be detected comprises a plurality of combinations to be detected, and each combination to be detected comprises a frequency to be detected and a phase to be detected;
aiming at a current set to be detected, taking a frequency to be detected and a phase to be detected which are contained in each combination to be detected in the set to be detected, carrying out preset signal capture operation on a received signal to obtain a first operation value of each combination to be detected, and judging whether a carrier frequency and a pseudo-random noise code phase can be captured or not according to the first operation value; the preset signal capturing operation comprises cross fuzzy function operation and coherent integration operation;
if not, starting to detect the next set to be detected;
if so, determining the frequency corresponding to the maximum first operation value as the captured target frequency, and determining the phase corresponding to the maximum first operation value as the captured target phase.
The communication bus mentioned in the electronic device may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.
The communication interface is used for communication between the electronic equipment and other equipment.
The Memory may include a Random Access Memory (RAM) or a Non-Volatile Memory (NVM), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components.
By applying the electronic equipment provided by the embodiment of the invention, a plurality of frequencies to be detected can be determined according to the preset minimum carrier frequency and the preset frequency step; determining a plurality of phases to be detected according to a preset minimum pseudo-random noise code phase and a preset phase step; generating a plurality of sets to be detected according to the frequency to be detected and the phase to be detected; each set to be detected comprises a plurality of combinations to be detected, and each combination to be detected comprises a frequency to be detected and a phase to be detected; aiming at a current set to be detected, taking a frequency to be detected and a phase to be detected which are contained in each combination to be detected in the set to be detected, carrying out preset signal capture operation on the frequency to be detected and a received signal to obtain a first operation value of each combination to be detected, and judging whether a carrier frequency and a pseudo-random noise code phase can be captured or not according to the first operation value; the preset signal capturing operation comprises cross fuzzy function operation and coherent integration operation; if not, starting to detect the next set to be detected; if so, determining the frequency corresponding to the maximum first operation value as the captured target frequency, and determining the phase corresponding to the maximum first operation value as the captured target phase. Therefore, the combination of the frequency to be detected and the phase to be detected is divided into a plurality of sets to be detected, the frequency and the phase in each set to be detected are detected in sequence, and compared with a signal capturing scheme without block detection, the accuracy of the captured carrier frequency and the pseudo-random noise code phase can be improved.
In yet another embodiment provided by the present invention, a computer-readable storage medium is further provided, in which a computer program is stored, and the computer program realizes the steps of any of the above signal acquisition methods when executed by a processor.
In a further embodiment provided by the present invention, there is also provided a computer program product containing instructions which, when run on a computer, cause the computer to perform any of the signal acquisition methods of the above embodiments.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the invention are brought about in whole or in part when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wirelessly (e.g., infrared, wireless, microwave, etc.). Computer-readable storage media can be any available media that can be accessed by a computer or a data storage device, such as a server, data center, etc., that includes one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the embodiments of the signal capturing apparatus, the electronic device, the computer readable storage medium and the computer program product, since they are substantially similar to the embodiments of the signal capturing method, the description is simple, and the relevant points can be referred to the partial description of the embodiments of the signal capturing method.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. A signal acquisition method, applied to a receiver, the method comprising:
determining a plurality of frequencies to be detected according to a preset frequency detection range and a preset frequency step; determining a plurality of phases to be detected according to a preset pseudo-random noise code phase detection range and a preset phase step length;
generating a plurality of sets to be detected according to the frequency to be detected and the phase to be detected; each set to be detected comprises a plurality of combinations to be detected, and each combination to be detected comprises a frequency to be detected and a phase to be detected;
aiming at a current set to be detected, taking a frequency to be detected and a phase to be detected which are contained in each combination to be detected in the set to be detected, carrying out preset signal capture operation on a received signal to obtain a first operation value of each combination to be detected, and judging whether a carrier frequency and a pseudo-random noise code phase can be captured or not according to the first operation value; the preset signal capturing operation comprises cross fuzzy function operation and coherent integration operation;
if not, starting to detect the next set to be detected;
if so, determining the frequency corresponding to the maximum first operation value as the captured target frequency, and determining the phase corresponding to the maximum first operation value as the captured target phase;
if the carrier frequency and the pseudo-random noise code phase can be captured, the method further comprises:
determining multiple re-detection frequencies according to the target frequency and a preset re-detection frequency step length;
determining a re-detection set according to the target phase and the re-detection frequency, wherein the re-detection set comprises a plurality of re-detection combinations, and each re-detection combination comprises the target phase and one re-detection frequency;
taking a target phase and a redetection frequency contained in each redetection combination in the redetection set, performing the signal capture operation on the target phase and the redetection frequency and the received signal to obtain a second operation value of each redetection combination, and judging whether the carrier frequency and the pseudo-random noise code phase can be captured in the redetection stage or not according to the second operation value of each redetection combination;
if not, starting to detect the next set to be detected;
and if so, determining the frequency corresponding to the maximum second operation value of the re-detection combination as the target frequency captured in the re-detection stage.
2. The method of claim 1, wherein the step of determining whether the carrier frequency and the pn code phase can be acquired according to the first operation value comprises:
determining a maximum first operation value;
judging whether the maximum first value is larger than a threshold value, if so, capturing a carrier frequency and a pseudo random noise code phase;
if not, it means that the carrier frequency and the pseudo random noise code phase are not captured;
wherein the threshold value is determined based on the following formula:
wherein U represents the threshold value, T represents a preset coefficient, B f Representing the number of said frequencies to be detected, B c Representing the number of the phases to be detected, k representing the serial number of the combination to be detected, P k Representing a first calculated value, k, of the kth combination to be detected m And indicating the serial number of the combination to be detected corresponding to the maximum first operation value.
3. The method of claim 1, wherein there are a plurality of pseudo-random noise codes to be detected, each pseudo-random noise code corresponding to a pseudo-random noise code number, the method further comprising:
and detecting a to-be-detected set corresponding to the pseudo-random noise codes of other code numbers, and determining a final signal acquisition result based on the detection result of each pseudo-random noise code.
4. A signal acquisition apparatus, for use in a receiver, the apparatus comprising:
the first determining module is used for determining a plurality of frequencies to be detected according to a preset frequency detection range and a preset frequency step length; determining a plurality of phases to be detected according to a preset pseudo-random noise code phase detection range and a preset phase step length;
the generating module is used for generating a plurality of sets to be detected according to the frequency to be detected and the phase to be detected; each set to be detected comprises a plurality of combinations to be detected, and each combination to be detected comprises a frequency to be detected and a phase to be detected;
the judging module is used for taking the frequency to be detected and the phase to be detected contained in each combination to be detected in the set to be detected, performing preset signal capture operation on the frequency to be detected and the phase to be detected with a received signal to obtain a first operation value of each combination to be detected, and judging whether the carrier frequency and the pseudo-random noise code phase can be captured or not according to the first operation value; the preset signal capturing operation comprises cross fuzzy function operation and coherent integration operation;
the first detection module is used for starting to detect the next set to be detected when the judgment result of the judgment module is negative;
a second determining module, configured to determine, when the determination result of the determining module is yes, a frequency corresponding to the largest first operation value as the captured target frequency, and determine a phase corresponding to the largest first operation value as the captured target phase;
a redetection module, the redetection module specifically configured to:
if the carrier frequency and the pseudo-random noise code phase can be captured, determining multiple re-detection frequencies according to the target frequency and a preset re-detection frequency step length;
determining a re-detection set according to the target phase and the re-detection frequency, wherein the re-detection set comprises a plurality of re-detection combinations, and each re-detection combination comprises the target phase and a re-detection frequency;
taking a target phase and a redetection frequency contained in each redetection combination in the redetection set, performing the signal acquisition operation on the target phase and the redetection frequency and the received signal to obtain a second operation value of each redetection combination, and judging whether the carrier frequency and the pseudo-random noise code phase can be acquired in a redetection stage according to the second operation value of each redetection combination;
if not, starting to detect the next set to be detected;
and if so, determining the frequency corresponding to the maximum second operation value of the re-detection combination as the target frequency captured in the re-detection stage.
5. The apparatus of claim 4, wherein the determining module is specifically configured to:
determining a maximum first operation value;
judging whether the maximum first value is larger than a threshold value, if so, capturing a carrier frequency and a pseudo-random noise code phase;
if not, it means that the carrier frequency and the pseudo random noise code phase are not captured;
wherein the threshold value is determined based on the following formula:
wherein U represents the threshold value, T represents a preset coefficient, B f Representing the number of said frequencies to be detected, B c Representing the number of the phases to be detected, k representing the serial number of the combination to be detected, P k Representing a first calculated value, k, of the kth combination to be detected m And indicating the serial number of the combination to be detected corresponding to the maximum first operation value.
6. The apparatus of claim 4, wherein a plurality of pseudo random noise codes are detected, each pseudo random noise code corresponding to a pseudo random noise code number, the apparatus further comprising: a second detection module to:
and detecting the to-be-detected sets corresponding to the pseudo-random noise codes of other code numbers, and determining a final signal acquisition result based on the detection result of each pseudo-random noise code.
7. An electronic device is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor and the communication interface are used for realizing mutual communication by the memory through the communication bus;
a memory for storing a computer program;
a processor for implementing the method steps of any of claims 1 to 3 when executing a program stored in the memory.
8. A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, which computer program, when being executed by a processor, carries out the method steps of any one of the claims 1-3.
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| CN103616704A (en) * | 2013-07-12 | 2014-03-05 | 成都海亨利科技有限公司 | Distributed signal capture method of a plurality of second generation Beidou receivers |
| CN104090282B (en) * | 2014-06-18 | 2016-10-05 | 北京邮电大学 | A kind of Doppler frequency shift capturing satellite-signal and the method and device of pseudo-code phase |
| CN109474306B (en) * | 2018-09-20 | 2021-01-26 | 中国人民解放军63653部队 | Detection and judgment method based on direct sequence spread spectrum signal capture |
| CN109633711B (en) * | 2018-12-24 | 2020-12-11 | 长沙北斗产业安全技术研究院有限公司 | Ultra-large dynamic and high-sensitivity spread spectrum measurement and control baseband receiving method and device |
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