CN114910937A - Multi-channel signal capture control method and system - Google Patents
Multi-channel signal capture control method and system Download PDFInfo
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- CN114910937A CN114910937A CN202110172802.0A CN202110172802A CN114910937A CN 114910937 A CN114910937 A CN 114910937A CN 202110172802 A CN202110172802 A CN 202110172802A CN 114910937 A CN114910937 A CN 114910937A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/246—Acquisition or tracking or demodulation of signals transmitted by the system involving long acquisition integration times, extended snapshots of signals or methods specifically directed towards weak signal acquisition
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/243—Demodulation of navigation message
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/25—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS
- G01S19/258—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS relating to the satellite constellation, e.g. almanac, ephemeris data, lists of satellites in view
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The application discloses a multichannel signal capture control method and system. The method comprises the following steps: determining satellite signal intensity, Doppler search range and pseudo code search range of a plurality of satellites to be captured according to the ephemeris or the almanac and the time information and the position information of the receiver; determining system control information for acquiring satellite signals according to the satellite signal strength, the Doppler search range and the pseudo code search range, wherein the determining of the system control information for acquiring the satellite signals comprises determining an acquisition mode for acquiring the satellite signals and determining the system acquisition control information according to the acquisition mode, and the acquisition mode comprises a real-time mode and a post-processing mode; and acquiring the satellite signal by adopting an acquisition mode and system acquisition control information to obtain an acquisition result. In this way, the system control module can capture satellite signals in different scenes based on different capture modes.
Description
Technical Field
The application belongs to the technical field of satellite navigation, and particularly relates to a multichannel signal capturing control method and system.
Background
The global satellite navigation system is composed of a plurality of navigation satellites, and in order to track and demodulate satellite signals, the pseudo code phase and the Doppler frequency of the satellite signals need to be estimated, so that the satellite signals are captured.
Currently, in order to acquire satellite signals quickly, the related art generally uses a buffer for signal data and a cache for reading the buffer for acquisition. However, due to the limitations of the strength of the satellite signals, data buffering during the satellite signal navigation process, signal search ranges of different channels, and other factors, the capturing mode in the related art cannot guarantee the capturing requirements for capturing the satellite signals of each scene, such as the sensitivity of signal capturing, the occupation of resources during the signal capturing process, and the integration time of signal capturing.
Disclosure of Invention
The embodiment of the application aims to provide a multichannel signal capture control method and system, which are suitable for multichannel large-range fast capture and small-range long-integration high-sensitivity capture.
In a first aspect, an embodiment of the present application provides a multi-channel signal acquisition control method, including:
determining satellite signal intensity, Doppler search range and pseudo code search range of a plurality of satellites to be captured according to ephemeris or almanac and time information and position information of a receiver;
determining system control information for acquiring satellite signals according to the satellite signal strength, the Doppler search range and the pseudo code search range, wherein the determining of the system control information for acquiring satellite signals comprises determining an acquisition mode for acquiring satellite signals and determining the system acquisition control information according to the acquisition mode, and the acquisition mode comprises a real-time mode and a post-processing mode;
and acquiring the satellite signal by adopting the acquisition mode and the system acquisition control information to obtain an acquisition result.
In a second aspect, an embodiment of the present application provides a multi-channel signal acquisition control system, including:
the navigation resolving module is used for determining satellite signal intensity, Doppler search range and pseudo code search range of a plurality of satellites to be captured according to ephemeris or almanac and time information and position information of the receiver; determining system control information for acquiring satellite signals according to the satellite signal strength, the Doppler search range and the pseudo code search range, wherein the determining of the system control information for acquiring the satellite signals comprises determining an acquisition mode for acquiring the satellite signals and determining corresponding system acquisition control information according to the acquisition mode, and the acquisition mode comprises a real-time mode and a post-processing mode;
and the signal acquisition module is connected with the navigation resolving module and used for acquiring the satellite signals by adopting the acquisition mode and the system acquisition control information to obtain an acquisition result.
In a third aspect, embodiments of the present application provide a readable storage medium, on which a program or instructions are stored, which when executed by a processor, implement the steps of the method according to the first aspect.
In the embodiment of the application, satellite signal strength, Doppler search range and pseudo code search range of a plurality of satellites to be acquired are determined according to ephemeris or almanac and time information and position information of a receiver; determining system control information for acquiring satellite signals according to the satellite signal strength, the Doppler search range and the pseudo code search range, wherein the determining of the system control information for acquiring the satellite signals comprises determining an acquisition mode for acquiring the satellite signals and determining the system acquisition control information according to the acquisition mode, and the acquisition mode comprises a real-time mode and a post-processing mode; and acquiring the satellite signal by adopting an acquisition mode and system acquisition control information to obtain an acquisition result. In this way, the system control module can capture satellite signals in different scenes based on different capture modes.
Drawings
Fig. 1 is a schematic flowchart of a multi-channel signal acquisition control method according to an embodiment of the present application;
FIG. 2 is a schematic diagram of signal processing in a real-time processing mode according to an embodiment of the present application;
FIG. 3 is a schematic diagram of signal processing in a post-processing mode according to an embodiment of the present application;
FIG. 4 is a schematic structural diagram of a multi-channel signal acquisition control system provided by an embodiment of the present application;
fig. 5 is a schematic structural diagram of a signal acquisition module according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a data store provided by an embodiment of the present application;
fig. 7 is a schematic structural diagram of a system cache module according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a system control module according to an embodiment of the present application.
Detailed Description
Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative only and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples thereof.
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 … …" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.
Currently, in order to acquire satellite information quickly, the related art generally uses a cache signal data and a cache read buffer for acquisition to complete the acquisition of multiple satellite signals. However, due to the limitations of the strength of the satellite signals, data buffering during the satellite signal navigation process, signal search ranges of different channels, and other factors, the capturing mode in the related art cannot guarantee the capturing requirements for capturing the satellite signals of each scene, such as the sensitivity of signal capturing, the occupation of resources during the signal capturing process, and the integration time of signal capturing.
In order to solve the technical problems in the related art, embodiments of the present application provide a multi-channel signal acquisition control method and system. The following first describes a multi-channel signal acquisition control method provided in the embodiments of the present application.
Fig. 1 is a flowchart illustrating a multi-channel signal acquisition control method 100 according to an embodiment of the present disclosure.
As shown in fig. 1, the multi-channel signal capturing control method 100 provided by the embodiment of the present application may include S101 to S103.
S101: and determining satellite signal strength, Doppler search range and pseudo code search range of a plurality of satellites to be acquired according to the ephemeris or the almanac and the time information and the position information of the receiver.
S102: and determining system control information for acquiring the satellite signals according to the satellite signal strength, the Doppler search range and the pseudo code search range, wherein the determining of the system control information for acquiring the satellite signals comprises determining an acquisition mode for acquiring the satellite signals, and the system acquisition control information determined according to the acquisition mode comprises a real-time mode and a post-processing mode.
S103: and acquiring the satellite signal by adopting an acquisition mode and system acquisition control information to obtain an acquisition result.
As shown in fig. 2, the real-time processing mode is to buffer the signal data and capture the signal data in the channels, that is, the signal data is buffered and captured in multiple channels simultaneously, the signal data can be divided into L segments in the real-time processing mode, and the signal data in the same segment is captured in multiple channels, and then the signal data in the next segment is captured in multiple channels until all the logical channels are captured. As shown in fig. 3, the post-processing mode refers to that signal data is buffered, and the buffered signal data needs to meet the data requirement of capturing processing performed by all channels, that is, the buffering of the signal data and the multi-channel capturing processing in the post-processing mode are in temporal precedence. The system control information includes acquisition mode and system acquisition control information. The system control information includes an acquisition mode and system acquisition control information corresponding to the acquisition mode. The capture mode may be a real-time mode, a post-processing mode, or a combination of a real-time mode and a post-processing mode.
The system acquisition control information further includes a capacity of memory space allocated to the satellite signals, a capacity of memory space allocated to the cache channel control state information, and a target base address of the cache channel control state information corresponding to the multiple channels.
And under the condition that the capture mode is a real-time mode, the channel control state information further comprises channel control information, channel state information and a channel capture result. When the capture mode is the post-processing mode, the channel control state information includes channel control information and a channel capture result.
Here, the channel control information includes doppler frequency search control parameters, pseudo code search control parameters corresponding to the channel, and the channel state information includes doppler search state information and pseudo code search state information corresponding to the channel.
In some embodiments, in S102, before determining that the system captures the control information, the capture mode may be determined. Specifically, under the conditions that the satellite signal intensity is greater than an intensity threshold value, the Doppler search range is greater than a first range threshold value, and the pseudo code search range is greater than a second range threshold value, determining that the acquisition mode is a post-processing mode; and determining the acquisition mode to be a real-time mode under the conditions that the satellite signal intensity is less than an intensity threshold value, the Doppler search range is less than a first range threshold value and the pseudo code search range is less than a second range threshold value.
In some embodiments, the system acquisition control information is determined by an acquisition mode. Specifically, a coherent integration time and a number of non-coherent accumulations are determined based on satellite signal strength. And when the acquisition mode is a real-time mode, determining the capacity of the storage space allocated to the cached satellite signals according to the signal length corresponding to the coherent integration time and the signal length corresponding to the pseudo code search range. And when the acquisition mode is a post-processing mode, determining the capacity of a storage space allocated to the cached satellite signals according to the signal length corresponding to the coherent integration time, the incoherent accumulation times and the signal length corresponding to the pseudo code search range.
In some embodiments, after receiving the satellite signal, it is necessary to buffer the satellite signal into the storage space allocated to buffer the satellite signal according to the capacity of the storage space allocated to buffer the satellite signal, and then the physical acquisition channel loads the satellite signal in the storage space to perform multi-channel acquisition on the satellite signal.
In some embodiments, the system control information further includes a down-conversion frequency, a down-sampling rate, and a weighting parameter. In order to ensure the accuracy of the satellite signal acquisition, the following steps may be further included in S103: and carrying out down-conversion, down-sampling and weighting processing on the satellite signal according to the down-conversion frequency, the down-sampling rate and the weighting parameters.
According to the multi-channel signal capturing control method provided by the embodiment of the application, the satellite signal intensity, the Doppler search range and the pseudo code search range of a satellite can be determined through the navigation calculation module according to ephemeris or almanac, the system time of the receiver and the approximate position of the receiver, and then capturing control parameters for capturing the satellite signals can be determined according to the satellite signal intensity, the Doppler search range, the pseudo code search range and the number of the satellites, wherein the capturing control parameters comprise the storage space size and the capturing mode of target signal data corresponding to the satellite signals, and the capturing mode comprises a real-time mode and/or a post-processing mode. In this way, the system control module can capture satellite signals in different scenes based on different capture modes.
Fig. 4 is a schematic structural diagram of a multi-channel signal acquisition control system 400 provided in an embodiment of the present application.
As shown in fig. 4, the multi-channel signal capture control system provided by the embodiment of the present application may include a navigation solution module 401 and a signal capture module 402.
The navigation resolving module 401 is configured to determine satellite signal intensities, doppler search ranges, and pseudo code search ranges of a plurality of satellites to be captured according to ephemeris or almanac and time information and position information of a receiver; determining system control information for acquiring satellite signals according to the satellite signal strength, the Doppler search range and the pseudo code search range, wherein the determining of the system control information for acquiring the satellite signals comprises determining an acquisition mode for acquiring the satellite signals and determining corresponding system acquisition control information according to the acquisition mode, and the acquisition mode comprises a real-time mode and a post-processing mode; and the signal acquisition module 402 is connected with the navigation calculation module 401, and acquires the satellite signal by adopting an acquisition mode and system acquisition control information to obtain an acquisition result.
As shown in fig. 2, in the real-time processing mode, signal data is buffered while channel capture is performed on the signal data, that is, the signal data is buffered and the multi-channel capture is performed simultaneously, in the real-time processing mode, the signal data may be divided into a plurality of segments, and the multi-channel capture is performed on the signal data of the same segment and then the signal data of the next segment until all the logic channels are captured. As shown in fig. 3, the post-processing mode refers to that signal data is buffered first, and the buffered signal data needs to meet the data requirement of capturing processing performed by all channels, that is, the buffering of the signal data and the capturing processing of multiple channels in the post-processing mode are temporally sequential. The system control information includes acquisition mode and system acquisition control information. The system control information includes an acquisition mode and system acquisition control information corresponding to the acquisition mode. The capture mode may be a real-time mode, a post-processing mode, or a combination of a real-time mode and a post-processing mode.
The system acquisition control information includes a capacity of a memory space allocated to the satellite signal, a capacity of a memory space allocated to the cache channel control state information, and a target base address of the cache channel control state information corresponding to the multiple channels.
And under the condition that the capture mode is the real-time mode, the channel control state information further comprises channel control information, channel state information and a channel capture result. When the capture mode is the post-processing mode, the channel control state information includes channel control information and a channel capture result.
Here, the channel control information includes doppler frequency search control parameters, pseudo code search control parameters corresponding to the channel, and the channel state information includes doppler search state information and pseudo code search state information corresponding to the channel.
In some embodiments, the signal acquisition module 402 further needs to determine the acquisition mode according to the satellite signal strength, the doppler search range, and the pseudo code search range determined by the navigation solution module. Specifically, under the conditions that the satellite signal intensity is greater than an intensity threshold value, the Doppler search range is greater than a first range threshold value, and the pseudo code search range is greater than a second range threshold value, determining that the acquisition mode is a post-processing mode; and determining the acquisition mode as a post-processing mode under the conditions that the satellite signal intensity is smaller than the intensity threshold, the Doppler search range is smaller than the first range threshold and the pseudo code search range is smaller than the second range threshold. In this way, the signal acquisition module 401 may acquire the satellite signal in different acquisition modes based on different signal characteristics.
In some embodiments, as shown in fig. 5, the signal capture module 401 includes a data preprocessing module 51, a system cache module 52, a system control module 53, and a physical capture channel 54. Each module is described in detail below.
First, the data preprocessing module 51 is described.
The data pre-processing module 51 includes a down-conversion module, a down-sampling module, and a weighting module. The down-conversion module consists of a carrier wave generator and a complex multiplier, and the carrier frequency can be configured. The down-sampling module consists of an accumulator and a down-sampling counter, and the down-sampling rate can be configured. The re-quantization module is composed of direct current estimation de-direct current and quantization threshold estimation re-quantization, and the direct current statistical time, the direct current smooth coefficient, the threshold statistical time and the threshold smooth coefficient can be configured. The carrier frequency can be configured to contain the center frequency of the estimated Doppler frequency, so that small-range Doppler frequency search can be performed; the down-sampling rate can be configured to contain twice the pseudo code rate of code doppler, thereby reducing the correlation loss caused by code doppler at long-integration acquisition.
And the data preprocessing module 51 is connected to the system control module 53 and the system cache module 52, and is configured to perform down-conversion, down-sampling and weighting processing on the satellite signal according to the down-conversion frequency, the down-sampling rate and the weighting parameter in the system control information, and send the output satellite signal to the system cache module 52.
Next, a system cache module 52 is introduced.
And the system cache module is respectively connected with the system control module, the data preprocessing module and the physical capture channel and used for storing the signal data from the data preprocessing module under the control of the system control module and outputting the signal data to the physical capture channel under the control of the system control module, and the residual storage capacity in the system cache module is used for storing the channel control state information of each channel under the control of the system control module.
Wherein, in the post-processing mode, the remaining storage capacity is used for storing channel control information and channel capture results; in a real-time mode, the residual storage capacity is used for storing channel control information, channel state information and a channel capturing result, wherein the channel state information is intermediate running state information obtained after signal capturing is carried out on signal data of a kth time period by a physical capturing channel;
the system cache module 52 is configured to cache signal data of the satellite signal processed by the data preprocessing module for high-speed reading processing by the physical acquisition channel 54, and cache channel control state information of each logical channel for operation control and state switching of each logical channel; under the control of the system control module, receiving signal data of the satellite signal sent by the data preprocessing module, and sending the signal data to a physical capturing channel for capturing; under the control of the system control module, channel control state information of each logic channel is cached, and the channel control state information of each logic channel is sent to the physical capture channel module to recover the channel control state information of each logic channel. Wherein the channel control state information includes channel control information and channel state information.
As shown in fig. 6, the system cache is divided into a signal data cache and a channel control state cache in terms of content, the size of the signal data cache is configurable, the channel control state cache can store channel control state information of each logic channel, and the channel control information mainly includes capture configuration parameters and capture result parameters. The channel state information comprises an operation state parameter and an intermediate result parameter, the space occupied by the configuration result parameter of each logic channel, the capture result parameter and the operation state parameter is completely consistent, only the values are different, and the intermediate result cache size is different according to different capture configuration parameters of each logic channel. The system cache content is as shown in the following figure, signal data is cached in front, channel control state information is cached immediately after the signal data is cached, a first address unit in each logic channel control state information cache stores a next logic channel base address used for indicating and searching a storage position of the next logic channel control state information, and then a capture configuration parameter, a capture result parameter, a capture operation state parameter and a capture intermediate result parameter of the logic channel are stored.
In some embodiments, as shown in FIG. 7, the system cache module further comprises an input selector and an output selector. Wherein an input selector and an output selector. Wherein the input selector and the output selector may each be a multiplexer. The input selector and the output selector are respectively connected with the storage unit. The input selector is used for determining a storage unit for caching target signal data and a storage unit for caching channel control state information according to the control instruction; and the output selector is used for determining a storage unit for outputting the target signal data and a storage unit for outputting the channel control state information according to the control instruction.
Specifically, in the real-time mode, the signal data cache size can be set to be small, and a space for caching the running state parameters and the intermediate results is reserved to be large.
The system cache module has the requirements of signal data writing, signal data reading and control state reading and writing which are carried out in parallel, the signal data writing operation is slow access, and the signal data reading and control state reading and writing are high-speed access; because the signal data high-speed reading and the control state high-speed reading and writing are carried out on different address units, the whole system cache can be properly divided into a plurality of smaller cache units, and the signal data storage space and the control state storage space are properly arranged to be not in the same storage unit, so that the data signal high-speed reading and the control state high-speed reading and writing access are carried out on different storage units in parallel at high speed. The lower diagram is a schematic diagram of a composition structure of a system cache module, an input multiplexer in the diagram is used for selecting whether input of each storage unit is signal data or a control state under the control of a system control module, and an output multiplexer is used for selecting output signal data and a control state of a target storage unit under the control of the system control module.
Next, the system control module 53 is introduced.
And the system control module 53 is configured to configure the system control information to a data preprocessing module and a system cache module in the multi-channel signal capture control system, and complete a multi-channel capture control function. The system control information includes a target base address, and the system control module 53 is further configured to configure the channel control information and the channel status information into a storage unit corresponding to the target base address in the system cache module, so as to physically capture the channel
As shown in fig. 8, the system control module 53 includes a bus interface, a system cache control module, and a system operation control module. In the system, the bus interface is connected with the navigation resolving module, so that the system control module obtains system channel control information, such as a capture mode, system capture control information and the like.
The system buffer control module writes the signal data after data preprocessing into system buffer address generation and write enable generation, address generation and read-write enable generation of read-write control state information, read address generation and read-write enable generation of signal data, the system buffer control module caches the address and read-write enable control signal of each storage unit according to the read-write enable of the signal data and the read-write enable of the control state, when the signal data simultaneously reads and writes the same storage unit, the signal data write-in is prior, and simultaneously reports access conflict to the system operation control submodule, and the system operation control submodule sends signal data read signals of the same address in the next clock cycle until no conflict successfully accesses.
Specifically, the system operation control module is configured to send a control instruction to the system cache control module, where the control instruction includes a system cache access address and a read-write enable control signal; the system operation control module can also be used for sending a control instruction to the physical capture channel, wherein the control instruction comprises a channel control state information loading instruction, a channel control state information caching instruction and a capture processing instruction; the system operation control module can also be used for receiving the operation state information of the physical capture channel, wherein the operation state information comprises channel capture completion and channel capture partial completion, the channel capture completion refers to the completion of the capture processing of all the required signal data of one channel, and the channel capture partial completion refers to the completion of the capture processing of the current signal data segment and is used in a real-time mode; the system operation control module is used for controlling the operation of a multi-channel capturing process according to a capturing mode, wherein in a real-time mode, the multi-channel capturing process comprises channel control information loading, physical capturing channel starting, signal data reading for channel capturing, channel state information caching or channel capturing result caching; in the post-processing mode, the multi-channel capture process comprises channel control information loading, physical capture channel starting, signal data reading, channel capture completion and channel capture result caching.
And the system cache control module is used for generating a first cache write address, a first write enable, a first cache read address and a first read enable of the target signal data according to the system cache access address and the read-write enable control signal, and generating a second cache address, a second write enable and a second read enable of the channel control state information.
The system cache module is used for caching the target signal data to a storage unit corresponding to a first cache write address according to the first write enable, and reading the target signal data from the storage unit corresponding to the first cache read address according to the first read enable; the system cache module may be further configured to cache the channel control state information to the storage unit corresponding to the second cache address according to the second write enable, and read the channel control state information from the storage unit corresponding to the second cache address according to the second read enable;
the physical capture channel is used for obtaining target signal data read from a storage unit corresponding to the first cache read address according to the first read enable; the physical capture channel is further used for caching the channel state information or the channel capture result to the storage unit corresponding to the second cache address according to the second write enable, and is used for acquiring the channel control state information read from the storage unit corresponding to the second cache address according to the second read enable;
in the post-processing mode, the physical capturing channel is used for receiving target signal data and channel control information, completing channel capturing and then caching a channel capturing result to a system cache; in a real-time mode, the physical capture channel is used for receiving target signal data and channel control state information of the channel, carrying out channel capture, caching the channel state information to a system cache if the current channel is not captured completely, and caching a channel capture result to the system cache if the current channel is captured completely.
Finally, the physical capture channel 54 is introduced.
The physical capturing channel is respectively connected with the system control module and the system cache module and is used for capturing the satellite signal in a capturing mode according to channel control state information in the system cache module and signal data of the satellite signal under the control of the system control module to obtain a capturing result;
in the post-processing mode, the system cache module is further configured to store a capture result of the ith logic channel after the ith logic channel finishes signal capture, so that the (i + 1) th logic channel performs signal capture; in the real-time mode, the system cache module is further configured to cache the channel control state information of the current channel after the physical capture channel completes processing of the signal data in the kth time period, and then load the channel control state information of the next channel to continue the capture processing of the next channel.
According to the multi-channel signal acquisition control system provided by the embodiment of the application, the satellite signal strength, the Doppler search range and the pseudo code search range of a satellite can be determined through the navigation resolving module according to ephemeris or almanac, the system time of the receiver and the approximate position of the receiver, and then the acquisition control parameters for acquiring the satellite signals can be determined according to the satellite signal strength, the Doppler search range, the pseudo code search range and the number of the satellites, wherein the acquisition control parameters comprise the storage space size and the acquisition mode of target signal data corresponding to the satellite signals, and the acquisition mode comprises a real-time mode and/or a post-processing mode. In this way, the system control module can capture satellite signals in different scenes based on different capture modes.
In addition, in combination with the multi-channel signal capturing control method in the foregoing embodiments, the embodiments of the present application may provide a computer storage medium to implement. The computer storage medium having computer program instructions stored thereon; the computer program instructions, when executed by a processor, implement any one of the multi-channel signal acquisition control methods in the above embodiments.
It is to be understood that the present application is not limited to the particular arrangements and instrumentality described above and shown in the attached drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present application are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications, and additions or change the order between the steps after comprehending the spirit of the present application.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic Circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the present application are the programs or code segments used to perform the required tasks. The program or code segments can be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transmit messages. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.
Aspects of the present disclosure are described above with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions/acts specified in the flowchart and/or block diagram block or blocks. Such a processor may be, but is not limited to, a general purpose processor, a special purpose processor, an application specific processor, or a field programmable logic circuit. It will also be understood that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware for performing the specified functions or acts, or combinations of special purpose hardware and computer instructions.
As described above, only the specific embodiments of the present application are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present application, and these modifications or substitutions should be covered within the scope of the present application.
Claims (11)
1. A multi-channel signal acquisition control method, comprising:
determining satellite signal intensity, Doppler search range and pseudo code search range of a plurality of satellites to be captured according to ephemeris or almanac and time information and position information of a receiver;
determining system control information for acquiring satellite signals according to the satellite signal strength, the Doppler search range and the pseudo code search range, wherein the determining of the system control information for acquiring satellite signals comprises determining an acquisition mode for acquiring satellite signals and determining the system acquisition control information according to the acquisition mode, and the acquisition mode comprises a real-time mode and a post-processing mode;
and capturing the satellite signal by adopting the capturing mode and the system capturing control information to obtain a capturing result.
2. The method of claim 1, wherein the system acquisition control information comprises a capacity of storage space allocated to caching satellite signals, and wherein determining corresponding system acquisition control information according to the acquisition mode comprises:
determining coherent integration time and incoherent accumulation times according to the satellite signal intensity;
when the acquisition mode is determined to be a real-time mode, determining the capacity of the storage space allocated to the cached satellite signals according to the signal length corresponding to the coherent integration time and the signal length corresponding to the pseudo code search range; and
when the acquisition mode is determined to be a post-processing mode, determining the capacity of the storage space allocated to the cache satellite signals according to the signal length corresponding to the coherent integration time, the incoherent accumulation times and the signal length corresponding to the pseudo code search range;
the acquiring the satellite signal by using the acquisition mode to obtain an acquisition result includes:
and buffering the satellite signals according to the size of the storage space allocated to the buffered satellite signals.
3. The method of claim 2, wherein the system capture control information comprises a target base address corresponding to multiple channels and a capacity of storage space allocated to cache channel control state information;
when the capture mode is determined to be a real-time mode, the channel control state information comprises channel control information, channel state information and a channel capture result; and
when the capture mode is determined to be a post-processing mode, the channel control state information comprises channel control information and a channel capture result;
wherein, the channel control information comprises Doppler frequency search control parameters and pseudo code search control parameters corresponding to the channel: the channel state information includes doppler search state information and pseudo code search state information corresponding to the channel.
4. The method of claim 1, wherein determining system control information for acquiring satellite signals based on the satellite signal strength, the doppler search range, and the pseudo code search range comprises:
determining the acquisition mode as the post-processing mode under the conditions that the satellite signal intensity is greater than an intensity threshold, the Doppler search range is greater than a first range threshold and the pseudo code search range is greater than a second range threshold;
and determining the acquisition mode to be the real-time mode under the conditions that the satellite signal strength is less than a strength threshold value, the Doppler search range is less than a first range threshold value and the pseudo code search range is less than a second range threshold value.
5. A multi-channel signal acquisition control system, comprising:
the navigation resolving module is used for determining satellite signal intensity, Doppler search range and pseudo code search range of a plurality of satellites to be captured according to ephemeris or almanac and time information and position information of the receiver; determining system control information for acquiring satellite signals according to the satellite signal strength, the Doppler search range and the pseudo code search range, wherein the determining of the system control information for acquiring the satellite signals comprises determining an acquisition mode for acquiring the satellite signals and determining corresponding system acquisition control information according to the acquisition mode, and the acquisition mode comprises a real-time mode and a post-processing mode;
and the signal acquisition module is connected with the navigation resolving module and used for acquiring the satellite signals by adopting the acquisition mode and the system acquisition control information to obtain an acquisition result.
6. The system of claim 5, wherein the system control information further comprises a size of a storage space for buffering satellite signals; the signal acquisition module includes:
the system control module is used for configuring the system acquisition control information to a data preprocessing module and a system cache module in the multi-channel signal acquisition control system and completing a multi-channel acquisition control function;
the data preprocessing module is connected with the system control module and the system cache module and is used for carrying out down-conversion, down-sampling and weighting processing on the satellite signals according to down-conversion frequency, down-sampling rate and weighting parameters in system control information and sending the output satellite signals to the system cache module;
the system cache module is respectively connected with the system control module, the data preprocessing module and the physical capturing channel and is used for storing signal data from the data preprocessing module under the control of the system control module and outputting the signal data to the physical capturing channel under the control of the system control module, and the residual storage capacity in the system cache module is used for storing channel control state information of each channel under the control of the system control module;
wherein, in the post-processing mode, the remaining storage capacity is used for storing channel control information and channel capture results; in a real-time mode, the residual storage capacity is used for storing channel control information, channel state information and a channel capture result, wherein the channel state information is intermediate operation state information obtained after signal capture is carried out on signal data of a kth time period by a physical capture channel;
the physical capturing channel is respectively connected with the system control module and the system cache module and is used for capturing the satellite signal in the capturing mode according to the channel control state information in the system cache module and the satellite signal under the control of the system control module to obtain a capturing result;
in the post-processing mode, the system cache module is further configured to store an ith logic channel capture result after the ith logic channel completes signal capture, so that the (i + 1) th logic channel performs signal capture; in the real-time mode, the system cache module is further configured to cache the channel control state information of the current channel after the physical capture channel completes processing of the signal data in the kth time period, and then load the channel control state information of the next channel to continue the capture processing of the next channel.
7. The system of claim 6, wherein the system control information further comprises a target base address;
the system control module is specifically configured to configure the channel control information and the channel state information to a storage unit corresponding to the target base address in the system cache module.
8. The system of claim 5, wherein the signal acquisition module is specifically configured to:
determining the acquisition mode as the post-processing mode under the conditions that the satellite signal intensity is greater than an intensity threshold, the Doppler search range is greater than a first range threshold and the pseudo code search range is greater than a second range threshold;
and determining the acquisition mode as the post-processing mode under the conditions that the satellite signal strength is smaller than a strength threshold value, the Doppler search range is smaller than a first range threshold value, and the pseudo code search range is smaller than a second range threshold value.
9. The system of claim 6, wherein the system cache module comprises a plurality of storage units, the signal data and the channel control status information are cached in different storage units, and the system control module comprises a system operation control module and a system cache control module which are connected with each other;
the system operation control module is used for sending a control instruction to the system cache control module, wherein the control instruction comprises a system cache access address and a read-write enabling control signal;
the system operation control module is used for sending a control instruction to the physical capture channel, wherein the control instruction comprises a channel control state information loading instruction, a channel control state information caching instruction and a capture processing starting instruction;
the system operation control module is used for receiving operation state information of a physical capture channel, wherein the operation state information comprises channel capture completion and channel capture partial completion, the channel capture completion refers to the completion of capture processing of all signal data required by one channel, and the channel capture partial completion refers to the completion of capture processing of a current signal data segment and is used in a real-time mode; the system operation control module is used for controlling the operation of a multi-channel capturing process according to the capturing mode, and under the real-time mode, the multi-channel capturing process comprises channel control information loading, physical capturing channel starting, signal data reading for channel capturing, channel state information caching or channel capturing result caching; in the post-processing mode, the multi-channel capturing process comprises channel control information loading, physical capturing channel starting, signal data reading, channel capturing and channel capturing result caching;
the system cache control module is configured to generate a first cache write address, a first write enable, a first cache read address, and a first read enable of the target signal data according to the system cache access address and the read/write enable control signal, and generate a second cache address, a second write enable, and a second read enable of the channel control state information;
the system cache module is configured to cache the target signal data to a storage unit corresponding to the first cache write address according to the first write enable, and read the target signal data from the storage unit corresponding to the first cache read address according to the first read enable;
the system cache module is configured to cache the channel control state information to the storage unit corresponding to the second cache address according to the second write enable, and read the channel control state information from the storage unit corresponding to the second cache address according to the second read enable;
the physical capture channel is used for obtaining the target signal data read from the storage unit corresponding to the first cache read address according to the first read enable;
the physical capture channel is configured to cache the channel state information or the channel capture result to the storage unit corresponding to the second cache address according to the second write enable, and acquire the channel control state information read from the storage unit corresponding to the second cache address according to the second read enable;
in the post-processing mode, the physical capture channel is used for receiving the target signal data and the channel control information, completing channel capture and then caching a channel capture result to a system cache;
in the real-time mode, the physical capture channel is used for receiving the target signal data and the channel control state information of the channel, performing channel capture, caching the channel state information to a system cache if the current channel is not captured completely, and caching the channel capture result to the system cache if the current channel is captured completely.
10. The system according to claim 9, wherein the system cache control module is further configured to, when the storage unit corresponding to the first cache write address is the same as the storage unit corresponding to the first cache read address, prioritize a first cache write operation, and report an access conflict signal to the system operation control module;
and the system operation control module is further configured to send a control instruction for reading target signal data from the storage unit corresponding to the first cache read address in a next clock cycle until the system cache control module stops reporting the access conflict signal.
11. The system according to claim 9, wherein the system buffer unit further comprises an input selector and an output selector, the input selector and the output selector being respectively connected to the storage unit;
the input selector is used for determining a storage unit for caching the target signal data and a storage unit for caching the channel control state information according to the control instruction;
and the output selector is used for determining a storage unit for outputting the target signal data and a storage unit for outputting the channel control state information according to the control instruction.
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| CN115327582A (en) * | 2022-10-13 | 2022-11-11 | 北京凯芯微科技有限公司 | GNSS signal processing circuit, GNSS signal processing method and receiver |
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| CN115327582A (en) * | 2022-10-13 | 2022-11-11 | 北京凯芯微科技有限公司 | GNSS signal processing circuit, GNSS signal processing method and receiver |
| CN115327582B (en) * | 2022-10-13 | 2023-02-14 | 北京凯芯微科技有限公司 | GNSS signal processing circuit, method and receiver |
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