CN116545498B - Satellite data acquisition system, method, equipment and storage medium - Google Patents
Satellite data acquisition system, method, equipment and storage medium Download PDFInfo
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Abstract
The invention discloses a satellite data acquisition system, a satellite data acquisition method, satellite data acquisition equipment and a satellite data acquisition storage medium, wherein the satellite data acquisition system comprises: the system comprises a ground system, at least two acquisition terminals and a satellite constellation; the ground system is used for generating a data acquisition function and transmitting the data acquisition function to at least two acquisition terminals through satellite constellations; the at least two acquisition terminals are used for ground data acquisition and transmit acquired data to a satellite constellation according to a data acquisition function; the satellite constellation is used for data forwarding between the ground system and at least two acquisition terminals, wherein the satellite constellation comprises at least one satellite, and each satellite corresponds to at least one acquisition arc segment. The satellite data acquisition system provided by the invention can execute the generation, issuing and executing methods of the data acquisition strategy of the satellite Internet of things acquisition terminal, thereby reducing the collision in the communication process of each acquisition terminal, improving the communication success rate and further improving the capacity of the whole communication system.
Description
Technical Field
The present invention relates to the field of satellite communications technologies, and in particular, to a satellite data acquisition system, method, device, and storage medium.
Background
Currently, some services of a low-rail internet of things constellation are typical channel competition systems. The number of data acquisition terminals accommodated in the data communication system is thousands of times larger than the number of channels provided by the data acquisition terminals, so that each terminal can only use the channels in a competitive mode, and the same channel is robbed by different terminals at the same time to cause conflict, wherein the conflict is a failed transmission, and the technical term is called data collision. Thus, it is desirable to avoid too many terminals communicating with one satellite.
On the other hand, after the deployment of the common low orbit constellation is completed, satellites are in a uniform distribution state in orbit, and the distribution characteristics of data acquisition terminals on the ground are required to be regional distribution according to the expansion of market business, so that the characteristics of centralized distribution of terminals in certain areas and sparse distribution of terminals in certain areas can appear. Because of limited satellite load receiving capability, in order to ensure reliable satellite reception of uplink data of ground terminals, batch uploading configuration is required in a terminal deployment dense area.
In the prior art, data collision is avoided, and a method for realizing batch uploading of data by a terminal is that when the terminal is arranged, a part of terminals are set to be transmitted in some uplink arcs, and the transmission is closed in other arcs. However, this method is very inflexible because the policy on the terminal is written in the terminal program, and the previously preset policy is disabled once the terminal is newly added or the terminal changes position.
Disclosure of Invention
The invention provides a satellite data acquisition system, a satellite data acquisition method, satellite data acquisition equipment and a satellite data acquisition storage medium, which are used for reducing collision between a data acquisition terminal and a satellite in a satellite internet of things system.
According to an aspect of the present invention, there is provided a satellite data acquisition system comprising: the system comprises a ground system, at least two acquisition terminals and a satellite constellation;
the ground system is used for generating a data acquisition function and transmitting the data acquisition function to the at least two acquisition terminals through the satellite constellation;
the at least two acquisition terminals are used for ground data acquisition and transmit acquired data to the satellite constellation according to the data acquisition function;
the satellite constellation is used for data forwarding between the ground system and the at least two acquisition terminals, wherein the satellite constellation comprises at least one satellite, and each satellite corresponds to at least one acquisition arc segment.
Optionally, the ground system is specifically configured to:
grouping the at least two acquisition terminals to obtain at least one grouping result;
and performing function fitting on the at least one grouping result, and determining a fitting result with fitting satisfaction degree larger than a set threshold value as the data acquisition function.
Optionally, the ground system is specifically configured to:
determining the terminal number and average acquisition frequency of the at least two acquisition terminals and the single acquisition capacity of the satellite constellation;
determining the grouping number of the acquisition terminals according to the number of the terminals, the average acquisition frequency and the single acquisition capacity;
dividing the at least two acquisition terminals according to the grouping number, and respectively distributing one acquisition arc section for each group.
Optionally, the ground system is specifically configured to:
acquiring a preset basis function, and terminal identifiers of corresponding acquisition terminals of each group and arc segment identifiers of acquisition arc segments, wherein the basis function is pre-stored in the ground system and the at least two acquisition terminals;
and determining coefficients of the base function, and fitting the base function into a Boolean function, wherein independent variables of the Boolean function are the terminal identification and the arc section identification.
Optionally, the ground system is specifically configured to:
acquiring coefficients of a basis function corresponding to the data acquisition function;
and transmitting coefficients of the basis functions corresponding to the data acquisition functions to the at least two acquisition terminals through the satellite constellation.
Optionally, for each acquisition terminal, the acquisition terminal is specifically configured to:
receiving the data acquisition function;
and determining a strategy evaluation result according to the data acquisition function, and if the strategy evaluation result is transmission, transmitting the acquired data to the satellite constellation.
Optionally, for each acquisition terminal, the acquisition terminal is specifically configured to:
receiving ephemeris broadcast of the satellite constellation, and determining an optimal time window for data transmission according to the ephemeris broadcast and the current position;
and if the strategy evaluation result is transmission, transmitting the acquired data to the satellite constellation in the optimal time window.
According to another aspect of the present invention, there is provided a satellite data acquisition method, the method being applied to a satellite data acquisition system, the system comprising: the system comprises a ground system, at least two acquisition terminals and a satellite constellation;
generating a data acquisition function through the ground system, and transmitting the data acquisition function to the at least two acquisition terminals through the satellite constellation;
ground data acquisition is carried out through the at least two acquisition terminals, and acquired data is sent to the satellite constellation according to the data acquisition function;
And forwarding data between the ground system and the at least two acquisition terminals through the satellite constellation, wherein the satellite constellation comprises at least one satellite, and each satellite corresponds to at least one acquisition arc section.
Further, generating, by the surface system, a data acquisition function comprising:
grouping the at least two acquisition terminals through the ground system to obtain at least one grouping result;
and performing function fitting on the at least one grouping result, and determining a fitting result with fitting satisfaction degree larger than a set threshold value as the data acquisition function.
Further, grouping the at least two acquisition terminals by the ground system includes:
determining the terminal number and average acquisition frequency of the at least two acquisition terminals and the single acquisition capacity of the satellite constellation through the ground system;
determining the grouping number of the acquisition terminals according to the number of the terminals, the average acquisition frequency and the single acquisition capacity;
dividing the at least two acquisition terminals according to the grouping number, and respectively distributing one acquisition arc section for each group.
Further, performing a function fit on the at least one grouping result, including:
Acquiring a preset basis function, and terminal identifiers of corresponding acquisition terminals of each group and arc segment identifiers of acquisition arc segments, wherein the basis function is pre-stored in the ground system and the at least two acquisition terminals;
and determining coefficients of the base function, and fitting the base function into a Boolean function, wherein independent variables of the Boolean function are the terminal identification and the arc section identification.
Further, transmitting the data acquisition function to the at least two acquisition terminals through the satellite constellation, including:
acquiring coefficients of a basis function corresponding to the data acquisition function;
and transmitting coefficients of the basis functions corresponding to the data acquisition functions to the at least two acquisition terminals through the satellite constellation.
Further, transmitting the acquired data to the satellite constellation according to the data acquisition function, including:
receiving the data acquisition function for each of the at least two acquisition terminals;
and determining a strategy evaluation result according to the data acquisition function, and if the strategy evaluation result is transmission, transmitting the acquired data to the satellite constellation.
Further, if the policy evaluation result is transmission, transmitting the collected data to the satellite constellation, including:
Receiving ephemeris broadcast of the satellite constellation, and determining an optimal time window for data transmission according to the position of the ephemeris broadcast and the current acquisition terminal;
and if the strategy evaluation result is transmission, transmitting the acquired data to the satellite constellation in the optimal time window.
According to another aspect of the present invention, there is provided an electronic apparatus including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the satellite data acquisition method according to any one of the embodiments of the present invention.
According to another aspect of the present invention, there is provided a computer readable storage medium storing computer instructions for causing a processor to execute the satellite data acquisition method according to any one of the embodiments of the present invention.
The invention discloses a satellite data acquisition system, which comprises: the system comprises a ground system, at least two acquisition terminals and a satellite constellation; the ground system is used for generating a data acquisition function and transmitting the data acquisition function to at least two acquisition terminals through satellite constellations; the at least two acquisition terminals are used for ground data acquisition and transmit acquired data to a satellite constellation according to a data acquisition function; the satellite constellation is used for data forwarding between the ground system and at least two acquisition terminals, wherein the satellite constellation comprises at least one satellite, and each satellite corresponds to at least one acquisition arc segment. The satellite data acquisition system provided by the invention can execute the generation, issuing and executing methods of the data acquisition strategy of the satellite Internet of things acquisition terminal, thereby reducing the collision in the communication process of each acquisition terminal, improving the communication success rate and further improving the capacity of the whole communication system.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a satellite data acquisition system according to a first embodiment of the present invention;
fig. 2 is a flowchart of a satellite data acquisition method according to a second embodiment of the present invention;
FIG. 3 is a schematic diagram of a ground system according to a first embodiment of the present invention;
fig. 4 is a schematic diagram of an execution process of an acquisition terminal according to a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic device implementing a satellite data acquisition method according to a third embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Fig. 1 is a schematic structural diagram of a satellite data acquisition system according to a first embodiment of the present invention, where the embodiment is applicable to a situation of communication through a satellite internet of things system, and the satellite data acquisition system may be implemented in a form of hardware and/or software. As shown in fig. 1, the system includes: a terrestrial system 110, at least two acquisition terminals 120, and a satellite constellation 130.
The ground system 110 is configured to generate a data acquisition function and transmit the data acquisition function to at least two acquisition terminals 120 via a satellite constellation 130.
At least two acquisition terminals 120 are used for ground data acquisition and transmit acquired data to satellite constellation 130 according to a data acquisition function.
The satellite constellation 130 is used for data forwarding between the ground system 110 and at least two acquisition terminals 120, wherein the satellite constellation 130 comprises at least one satellite, each satellite corresponding to at least one acquisition arc.
The ground system 110 is a terrestrial communication part of a satellite communication system, among other things, that is a system that provides control and data support for the entire spacecraft. The collection terminal 120 is a data collection device on the ground, and may perform a set data collection task, such as collecting various indexes of groundwater. Satellite constellation 130 is a collection of satellites that are orbiting to function properly, typically a network of satellites configured in a certain manner.
In this embodiment, the data acquisition function is a functional representation of the data acquisition strategy performed by the acquisition terminal 120. The data acquisition function is generated by the ground system 110, the satellite constellation 130 is used as a data transmission path, the data acquisition function is forwarded to the acquisition terminal 120, and the acquisition terminal 120 judges whether to send the acquired data to the satellite constellation 130 in the current period according to the data acquisition function, so that a corresponding data acquisition strategy is executed.
Alternatively, the surface system 110 may manage the mission area. The task area is a centralized layout area of the acquisition terminals 120, in which each acquisition terminal 120 performs the same acquisition task, and transmits acquired data to the satellite constellation 130. The ground system 110 may determine a reasonable data acquisition policy according to the number of acquisition terminals 120 in the task area, the data acquisition arc segments of each satellite in the satellite constellation 130 passing through the task area, the frequency of each acquisition terminal 120 uploading data to the satellite constellation 130, and other information, that is, reasonably allocate the period of time for each acquisition terminal 120 to transmit data to the satellite constellation 130, so as to avoid the collision situation generated when multiple terminals use the same satellite channel at the same time. After generating the data acquisition function, the ground system 110 may send the data acquisition function to the satellite constellation 130 for forwarding to the acquisition terminal 120, thereby completing the generation and uploading of the data acquisition strategy.
Optionally, the ground system 110 is specifically configured to:
grouping the at least two acquisition terminals 120 to obtain at least one grouping result; and performing function fitting on at least one grouping result, and determining a fitting result with fitting satisfaction degree larger than a set threshold value as a data acquisition function.
In this embodiment, the ground system 110 may generate the data acquisition strategy by grouping the acquisition terminals 120 in the task area, so that the acquisition terminals 120 in the same group send the acquired data to the same acquisition arc segment, and the acquisition arc segments corresponding to the acquisition terminals 120 in different groups are different. The acquisition arc segment is an arc track formed when a satellite passes through a task area corresponding to the acquisition terminal 120, and one satellite may correspond to one or more acquisition arc segments because the same satellite may pass through the task area multiple times in one acquisition period (typically, one day). Each acquisition arc can determine its unique identity based on the spacecraft identity of the corresponding satellite and the number of passes through the mission region, e.g. B h,m Can represent spacecraft identification B h The satellite (m) passes through the acquisition arc section formed by the task area for the mth time and is directed to the acquisition arc section B h,m Transmitting data, i.e. at satellite B h The mth time passes through the task area to the satellite B h And transmitting the data.
Further, after determining the grouping mode, the grouping result may be fit into a functional form. Since it may be difficult to find a perfectly fitting data acquisition function when the number of acquisition terminals 120 is relatively large, a threshold of satisfaction may be set as long as the fitting satisfaction of the fitted function is greater than the threshold, since our grouping aims to reduce the probability of collisions generated by each acquisition terminal 120 when transmitting data. The higher the fit satisfaction, the more excellent the fitted function can be considered, if the preset threshold value is exceeded, for example, 90%, the fit function can be considered to meet the requirement, the data acquisition function is determined, and otherwise, another grouping mode is selected for function fitting.
Optionally, the ground system 110 is specifically configured to:
determining the number of terminals and average acquisition frequency of at least two acquisition terminals 120, and a single acquisition capacity of the satellite constellation 130; determining the grouping number of the acquisition terminals 120 according to the number of the terminals, the average acquisition frequency and the single acquisition capacity; at least two acquisition terminals 120 are divided according to the number of groups and each group is assigned one acquisition arc segment.
In this embodiment, when the ground system 110 groups at least two acquisition terminals 120, a specific grouping number needs to be determined first, and then the grouping number is divided according to the grouping number, so as to reduce the probability of collision between the groups, where the acquisition arcs of each group for receiving the data of the acquisition terminals 120 are different.
Preferably, the number of packets is related to the number of acquisition terminals 120 in the mission zone, the satellite's data receiving capability in one acquisition arc, and the size of the need for the acquisition terminals 120 to transmit data. Specifically, the surface system 110 may first obtain a range of the task area, which is typically a single-connected simple convex polygon or circular area, and is composed of a series of arrays of point coordinates (longitude and latitude) traversed in a clockwise direction. Typically, the area of a mission area is about several hundred to several tens of thousands of square kilometers, typically a county or province (state) area. The surface system 110 may then obtain a list of terminals in the task area that includes terminal Identifications (IDs) for all acquisition terminals 120 in the task area, each terminal identification being globally unique, typically a positive integer. The terminal list of the task area may be added by an administrator in an interface of the ground system 110, or may be that the acquisition terminal 120 with GNSS positioning reports to a constellation, the constellation is forwarded to the ground system 110, and then the constellation is associated to a corresponding task area by the ground system 110, where the acquisition terminal 120 included in the terminal list has functions of data acquisition and satellite communication. From the terminal list, the terrestrial system 110 can determine the number of terminals of the acquisition terminals 120 that need to be grouped.
Further, the size of the data transmitted by each acquisition terminal 120 may be represented by its data acquisition frequency. The data acquisition frequency is the frequency requirement of the corresponding acquisition terminal for uploading data to the satellite, and the data acquisition frequency of each acquisition terminal is related to the historical receiving condition of the acquisition terminal, for example, the packet loss condition of a certain acquisition terminal when uploading data to the satellite is serious, so that the data acquisition frequency of the acquisition terminal can be improved, and otherwise, the data acquisition frequency can be reduced. The ground system 110 may count the historical receiving conditions of each acquisition terminal 120, then determine the data acquisition frequency when each acquisition terminal 120 uploads data to the satellite this time, and calculate the average acquisition frequency of all the acquisition terminals 120.
The data reception capacity of a satellite in one acquisition arc may be expressed in terms of the single acquisition capacity of the satellite constellation 130, i.e., the maximum amount of data that a satellite can receive in one acquisition arc. The number of terminals in the task area, the average acquisition frequency and the single acquisition capacity are respectively represented by T, P and S, and the number of groups of the acquisition terminals 120 is represented by W, so that the method comprises the following steps
From the above equation, a specific number of packets for the acquisition terminal 120 may be determined.
After determining the number of the groups, each acquisition terminal 120 may be divided into W groups, where each acquisition terminal 120 in the same group is dispersed as far as possible in the ground according to the principle of position dispersion, so as to reduce the communication interference between each other, and allocate different acquisition arcs to each group.
Further, it may also be determined whether the satellite constellation 130 has sufficient capacity to perform this data acquisition task prior to grouping. The ground system 110 may determine the number of acquisition arcs formed by all satellites in the satellite constellation 130 in one acquisition cycle, for example, if one satellite constellation includes 5 satellites, in one acquisition cycle, 3 satellites pass through the mission region once, and 2 pass through the mission region twice, the number of acquisition arcs formed by the satellite constellation in one acquisition cycle is 7. Let the number of acquisition arcs formed in one acquisition cycle in the satellite constellation 130 be A, the mode of judging whether the satellite constellation 130 has enough capacity to perform the data acquisition task at this time may be to judge whether W is less than or equal to A, if the inequality cannot be satisfied, it is indicated that the capacity of the satellite constellation 130 is insufficient to complete the acquisition task of all terminals in the task area. Preferably, the acquisition task performance capability of a single satellite may also be considered when counting the number of acquisition arcs of the satellite constellation 130, for example, if a certain satellite is already in a state of low on-board energy when passing through the task area, the satellite may be excluded from the executor of the task, and the corresponding acquisition arc is not counted among the acquisition arcs of the satellite constellation 130.
Optionally, the ground system 110 is specifically configured to:
acquiring a preset basis function, and terminal identifiers of the corresponding acquisition terminals of each group and arc segment identifiers of the acquisition arc segments, wherein the basis function is pre-stored in the ground system 110 and at least two acquisition terminals 120; and determining coefficients of the basis function, and fitting the basis function into a Boolean function, wherein independent variables of the Boolean function are a terminal identifier and an arc section identifier.
In this embodiment, after the acquisition terminals 120 are grouped, there may be multiple grouping modes, and the grouping result may be represented in the form of a data acquisition function by a function fitting mode. Preferably, the data acquisition function may be a boolean function consisting of a plurality of basis functions, and the system of basis functions is determined, i.e. the fitted function may be determined. Where the Boolean function (Boolean function) is a function describing how to determine the Boolean value output based on some logical calculation of the Boolean input, the Boolean value being one of True or False.
Specifically, the grouping mode is { T } 1,1 ，T 1,2 ，…，T 1,n1 }，{T 2,1 ，T 2,2 ，…，T 2,n2 }，…，{T w,1 ，T w,2 ，…，T w,nw The number of acquisition terminals 120 in each group is n1, n2, …, nw, for a total of W groups, where each element in a group represents the terminal identity of one acquisition terminal 120. Notably, these terminal identifications may be repeated in different packets, since the data acquisition frequency of some acquisition terminals 120 is greater than 1, which may occur in multiple packets. The number of acquisition terminals 120 in each group satisfies (n1+n2+ … +nw)/t=p, where T is the number of terminals in the task area and P is the average acquisition frequency of each acquisition terminal. And then adopting a function fitting method to fit the grouping result into a function F according to the terminal identification of the corresponding acquisition terminal of each group and the arc segment identification of the acquisition arc segment. F is a Boolean function, i.e., output 0, 1 or False/True. The representation of the function F is as follows:
F(B h,m ，T i,1 )＝1，F(B h,m ，T i,2 )＝1，…，F(B h,m ，T i,ni )＝1；
F(B h,m ，T j,1 )＝0，F(B h,m ，T j,2 )＝0，…，F(B h,m ，T j,nj )＝0；(i≠j)。
Wherein, i is more than or equal to 1, j is more than or equal to W; b (B) h,m Is arc section mark, which indicates that spacecraft mark is B h An acquisition arc section formed by the mth satellite passing through the task area; t (T) i,ni And T j,nj And respectively representing an (ni) acquisition terminal in the ith group and an (nj) acquisition terminal in the jth group for terminal identification. The function is represented by the spacecraft identification B h Each acquisition terminal 120 in the ith packet is caused to transmit data to it while the acquisition terminals 120 of the other groups are not transmitting when the satellite of (m) th passes through the mission zone. Similarly, other groupings have correspondingly different acquisition arcs and can be represented by the functional form described above.
Optionally, the ground system 110 is specifically configured to:
acquiring coefficients of a base function corresponding to the data acquisition function; the coefficients of the basis functions corresponding to the data acquisition functions are transmitted to the at least two acquisition terminals 120 via the satellite constellation 130.
In this embodiment, when the ground system 110 determines the data acquisition function and sends the data acquisition function to each acquisition terminal 120, if the basis function of the data acquisition function is pre-stored in the ground system 110 and each acquisition terminal 120, the coefficients of the basis function corresponding to the data acquisition function are sent, and the acquisition terminal 120 can reestablish the complete data acquisition function according to the pre-stored basis function and the received basis function coefficients.
Preferably, the ground system 110 may upload the coefficients of the basis functions corresponding to the data acquisition functions to the satellite constellation 130, so that the coefficients are transmitted to the respective acquisition terminals 120 by broadcasting when the task area stays.
In this embodiment, the acquisition terminal 120 may be an internet of things terminal, which belongs to an intermediate device of the sensing network layer and the transmission network layer, and is also a key device of the internet of things, and through conversion and acquisition, various external sensing data can be collected and processed, and the data can be transmitted to the internet through various network interface modes. Terminals do not have a communication link with each other and therefore are unaware of the existence of other terminals.
Optionally, for each acquisition terminal 120, the acquisition terminal 120 is specifically configured to:
receiving a data acquisition function; and determining a strategy evaluation result according to the data acquisition function, and if the strategy evaluation result is transmission, transmitting the acquired data to the satellite constellation 130.
The policy evaluation result is a basis for determining whether the data transmission should be performed by the acquisition terminal 120, if the policy evaluation result is that the data transmission should be performed, the acquired data is transmitted to the satellite constellation 130, otherwise, the data is not transmitted, and the data is re-determined when the satellite passes the border next time.
In this embodiment, acquisition terminal 120 receives the data acquisition function generated by terrestrial system 110 by receiving the broadcast of satellite constellation 130. Meanwhile, the acquisition terminal 120 can also receive the spacecraft identification of the satellite passing through the task area and the number of turns passing through the task area, so as to determine the arc segment identification of the corresponding acquisition arc segment, and substitute the terminal identification and the arc segment identification into the data acquisition function, and obtain a strategy evaluation result according to the function value.
Specifically, after receiving the data acquisition function, the acquisition terminal 120 may first determine whether it is valid, and if not, continue to monitor satellite broadcast. Optionally, a verification code may be attached to the satellite broadcast of the data collection function, and the collection terminal 120 may determine the validity of the data collection function according to the verification code. Alternatively, the invalid data collection function may be a contracted function containing a special coefficient combination, and may be used in the case where the current satellite does not participate in the terminal data collection in the task area. If the data acquisition function is valid, the acquisition terminal 120 can calculate the value f of the data acquisition function according to the terminal identification of the acquisition terminal and the arc identification of the current acquisition arc, if f is 1 or True, the acquisition terminal 120 sends the acquired data to the current transit satellite, otherwise, the acquisition terminal 120 enters a sleep mode to wait for the next satellite transit.
For example, assume that the surface system 110 sends the following data acquisition functions:
F(B 1,1 ，T 1,1 )＝1，F(B 1,1 ，T 1,2 )＝1，…，F(B 1,1 ，T 1,n1 )＝1；
F(B 1,1 ，T j,1 )＝0，F(B 1,1 ，T j,2 )＝0，…，F(B 1,1 ，T j,nj )＝0；(j≠1)。
then the identity is T for the terminal 1,1 When the spacecraft is marked as B 1 The acquisition terminal calculates F (B 1,1 ，T 1,1 ) And (1) determining that the strategy evaluation result is transmission by the acquisition terminal. Also, with T 1,1 Acquisition terminals T of the same group 1,2 、…、T 1,n1 Also determine that the policy evaluation result is sent, and then, the policy evaluation result is sent with T 1,1 The calculation result of other acquisition terminals in different groups is 0, and the strategy evaluation result is not sent.
Optionally, for each acquisition terminal 120, the acquisition terminal 120 is specifically configured to:
receiving an ephemeris broadcast of the satellite constellation 130, and determining an optimal time window for data transmission according to the ephemeris broadcast and the current position of the current acquisition terminal 120; if the policy evaluation results in transmission, the acquired data is transmitted to the satellite constellation 130 within the optimal time window.
Wherein the optimal time window is the optimal time period for the acquisition terminal 120 to properly transmit data to the satellite.
In this embodiment, the acquisition terminal 120 may also determine the best time window for the terminal based on the ephemeris broadcast of the satellite constellation 130.
Specifically, the satellite that undertakes the data acquisition task may determine that it is entering the task area according to the start time of the acquisition arc, and the start and end time of the acquisition arc is actually the time of the satellite that is uploaded to the satellite constellation 130 by the ground system, so the satellite simply needs to determine the time range to know whether it is passing through the task area, and may inform the acquisition terminal 120 of the start and end time of the acquisition arc through ephemeris broadcast. After receiving the ephemeris broadcast, the acquisition terminal 120 enters into an operation mode, and combines the satellite ephemeris and the current position of the acquisition terminal, so as to calculate an optimal time window for data transmission. If the policy evaluation result is calculated according to the data acquisition function, the acquired data is transmitted to the satellite constellation 130 in the optimal time window.
The satellite data acquisition system disclosed by the embodiment of the invention comprises: the system comprises a ground system, at least two acquisition terminals and a satellite constellation; the ground system is used for generating a data acquisition function and transmitting the data acquisition function to at least two acquisition terminals through satellite constellations; the at least two acquisition terminals are used for ground data acquisition and transmit acquired data to a satellite constellation according to a data acquisition function; the satellite constellation is used for data forwarding between the ground system and at least two acquisition terminals, wherein the satellite constellation comprises at least one satellite, and each satellite corresponds to at least one acquisition arc segment. According to the satellite data acquisition system disclosed by the embodiment of the invention, the data acquisition strategy when the ground acquisition terminal is in communication with the satellite is generated through the ground system, the acquisition terminal is grouped by the strategy, the task sharing among a plurality of satellites for executing tasks in a satellite constellation is considered, the task load balancing effect of the constellation is achieved, the situation when the acquisition terminal is in communication with the satellite in the past is considered, and the success probability of reporting data by the acquisition terminal with weaker historical acquisition quality can be improved. Meanwhile, the strategy has less modification to the satellite load and the terminal, is easy to realize, has little limitation to terminal distribution, and can furthest adapt to the acquisition requirements of different application scenes.
Example two
Fig. 2 is a flowchart of a satellite data acquisition method according to a second embodiment of the present invention, where the method may be performed by a satellite data acquisition system, the system includes a ground system, at least two acquisition terminals, and a satellite constellation, and the satellite data acquisition system may be implemented in hardware and/or software. As shown in fig. 2, the method includes:
s210, generating a data acquisition function through a ground system, and transmitting the data acquisition function to at least two acquisition terminals through satellite constellations.
Alternatively, the manner in which the data acquisition function is generated by the ground system may be: grouping at least two acquisition terminals through a ground system to obtain at least one grouping result; and performing function fitting on at least one grouping result, and determining a fitting result with fitting satisfaction degree larger than a set threshold value as a data acquisition function.
In this embodiment, the ground system may be used to group the acquisition terminals in the task area, so that the acquisition terminals in the same group send the acquired data to the same acquisition arc segment, and the acquisition arcs corresponding to the acquisition terminals in different groups are different. The acquisition arc segments are arc tracks formed when a satellite passes through a task area corresponding to the acquisition terminal, and one satellite can correspond to one or more acquisition arc segments because the same satellite can pass through the task area for multiple times in one acquisition period (generally one day). Each acquisition arc can determine its unique identity based on the spacecraft identity of the corresponding satellite and the number of passes through the mission region, e.g. B h,m Can represent spacecraft identification B h The satellite (m) passes through the acquisition arc section formed by the task area for the mth time to acquireArc segment B h,m Transmitting data, i.e. at satellite B h The mth time passes through the task area to the satellite B h And transmitting the data. After determining the grouping mode, the grouping result may be fit into a functional form. When the number of the acquisition terminals is relatively large, it may be difficult to find a perfectly fitting data acquisition function, and since the purpose of grouping is to reduce the probability of collision generated by each acquisition terminal when transmitting data, a threshold of satisfaction can be set, and the fit satisfaction of the fitted function can be determined as the data acquisition function as long as the fit satisfaction of the fitted function is larger than the threshold.
Further, the manner of grouping at least two acquisition terminals through the ground system may be: determining the terminal number and average acquisition frequency of at least two acquisition terminals and the single acquisition capacity of a satellite constellation through a ground system; determining the grouping number of the acquisition terminals according to the number of the terminals, the average acquisition frequency and the single acquisition capacity; dividing at least two acquisition terminals according to the grouping number, and respectively distributing one acquisition arc section for each group.
Preferably, the number of packets is related to the number of acquisition terminals in the task area, the data receiving capability of the satellite in one acquisition arc segment, and the size of the requirement for the acquisition terminals to transmit data. The ground system may first obtain the range of the task area and then obtain a terminal list in this task area that contains terminal Identifications (IDs) for all acquisition terminals in the task area, each terminal identification being globally unique, typically a positive integer. From the terminal list, the ground system may determine the number of terminals of the acquisition terminals that need to be grouped. The data transmission requirement of each acquisition terminal can be represented by the data acquisition frequency. The data acquisition frequency corresponds to the frequency requirement of the acquisition terminal for uploading data to the satellite, and the data acquisition frequency of each acquisition terminal is related to the historical receiving condition of the acquisition terminal. The ground system can count the historical receiving condition of each acquisition terminal, then determine the data acquisition frequency when each acquisition terminal uploads data to the satellite, and calculate the average acquisition frequency of all the acquisition terminals. The data receiving capacity of satellite in one acquisition arc segment can be used as the single acquisition capacity of satellite constellation Representing the maximum amount of data a satellite can receive in an acquisition arc. The number of terminals, average acquisition frequency and single acquisition capacity in the task area are respectively represented by T, P and S, and the grouping number of the acquisition terminals is represented by W, so that the method comprises the following stepsFrom the above equation, a specific number of packets for the acquisition terminal may be determined. After the number of the groups is determined, each acquisition terminal can be divided into W groups, and each acquisition terminal in the same group is dispersed as far as possible in the position in the ground according to the position dispersion principle in the division, so that the communication interference among the acquisition terminals is reduced, and different acquisition arc sections are allocated for each group.
Further, the manner of performing the function fitting on the at least one grouping result may be: acquiring a preset basis function, and terminal identifiers of all groups of corresponding acquisition terminals and arc segment identifiers of acquisition arc segments, wherein the basis function is pre-stored in a ground system and at least two acquisition terminals; and determining coefficients of the basis function, and fitting the basis function into a Boolean function, wherein independent variables of the Boolean function are a terminal identifier and an arc section identifier.
In this embodiment, after the acquisition terminals are grouped, there may be multiple grouping modes, and the grouping result may be represented in the form of a data acquisition function by a function fitting mode. Preferably, the data acquisition function may be a boolean function consisting of a plurality of basis functions, and the system of basis functions is determined, i.e. the fitted function may be determined. Where the Boolean function (Boolean function) is a function describing how to determine the Boolean value output based on some logical calculation of the Boolean input, the Boolean value being one of True or False.
Optionally, the data acquisition function may be sent to at least two acquisition terminals by satellite constellation: acquiring coefficients of a base function corresponding to the data acquisition function; and transmitting coefficients of the basis functions corresponding to the data acquisition functions to at least two acquisition terminals through satellite constellations.
In this embodiment, since the base functions are pre-stored in the ground system and each acquisition terminal, the coefficients of the base functions corresponding to the data acquisition functions are sent, and the acquisition terminals can reestablish the complete data acquisition functions according to the pre-stored base functions and the received base function coefficients.
Fig. 3 is a schematic diagram of an implementation process of a ground system according to an embodiment of the present invention, where the ground system is shown as the figure, and the task area range and the number of acquisition terminals in the task area are first obtained, then the single acquisition capacity of an acquisition arc segment of a satellite in a satellite constellation and the average acquisition frequency of each acquisition terminal in the present task are respectively calculated, so as to calculate the number of groups of the acquisition terminals, and the acquisition terminals are grouped according to the number of groups. As a plurality of grouping results can be provided, function fitting is performed in one grouping mode, and if the fitted satisfaction is larger than a set threshold, the fitting result can be considered to be excellent enough and can be used as a data acquisition function. And finally, the ground system transmits the basic function parameters of the data acquisition function to the acquisition terminal through the satellite.
S220, data forwarding between the ground system and at least two acquisition terminals is performed through a satellite constellation, wherein the satellite constellation comprises at least one satellite, and each satellite corresponds to at least one acquisition arc segment.
S230, ground data acquisition is carried out through at least two acquisition terminals, and acquired data is sent to a satellite constellation according to a data acquisition function.
Further, the manner of transmitting the acquired data to the satellite constellation according to the data acquisition function may be: receiving a data acquisition function for each of the at least two acquisition terminals; and determining a strategy evaluation result according to the data acquisition function, and if the strategy evaluation result is transmission, transmitting the acquired data to a satellite constellation.
In this embodiment, the acquisition terminal receives the ground system generated data acquisition function by receiving the broadcast of the satellite constellation. Meanwhile, the acquisition terminal can also receive the spacecraft identification of the satellite passing through the task area and the number of turns passing through the task area, so that the arc section identification of the corresponding acquisition arc section is determined, the terminal identification and the arc section identification are substituted into the data acquisition function to calculate the value f of the data acquisition function, if f is 1 or True, the acquisition terminal sends the acquired data to the current transit satellite, otherwise, the acquisition terminal enters a dormant mode to wait for the next satellite transit.
Further, after the acquisition terminal receives the data acquisition function, whether the data acquisition function is effective or not can be judged first, and if the data acquisition function is ineffective, satellite broadcasting is continuously monitored. Optionally, a verification code may be attached to the satellite broadcast of the data acquisition function, and the acquisition terminal may determine the validity of the data acquisition function according to the verification code. Alternatively, the invalid data collection function may be a contracted function containing a special coefficient combination, and may be used in the case where the current satellite does not participate in the terminal data collection in the task area.
Further, if the policy evaluation result is transmission, the manner of transmitting the collected data to the satellite constellation may be: receiving ephemeris broadcasting of a satellite constellation, and determining an optimal time window for data transmission according to the position of the ephemeris broadcasting and the current acquisition terminal; and if the strategy evaluation result is transmission, transmitting the acquired data to a satellite constellation in an optimal time window.
Specifically, the satellite bearing the data acquisition task can judge that the satellite is entering the task area according to the starting time of the acquisition arc segment, and the starting and ending time of the acquisition arc segment is actually the satellite which is uploaded to the satellite constellation by the ground system, so that the satellite can know whether the satellite is passing through the task area or not only by simply judging the time range, and can inform the acquisition terminal of the starting and ending time of the acquisition arc segment through ephemeris broadcasting. After receiving the ephemeris broadcast, the acquisition terminal enters into a working mode, and can calculate the optimal time window for data transmission by combining the satellite ephemeris and the current position of the acquisition terminal. And if the strategy evaluation result is obtained by calculation according to the data acquisition function, sending the acquired data to a satellite constellation in the optimal time window.
Fig. 4 is a schematic diagram of an execution process of an acquisition terminal according to an embodiment of the present invention, where the acquisition terminal receives satellite ephemeris broadcast, and then enters a working mode, and receives a data acquisition function of satellite broadcast through the acquisition terminal, if the function is valid, the function value is calculated, otherwise, the satellite broadcast is received again. After the function value is obtained, if the strategy result is determined to be transmission according to the function value, data is transmitted to the satellite, otherwise, the satellite enters a sleep mode, and the next satellite passing is waited.
The satellite data acquisition method disclosed by the embodiment of the invention can be executed by the satellite data acquisition system provided by any embodiment, and has the corresponding functional modules and beneficial effects of the execution system.
Example III
Fig. 5 shows a schematic diagram of the structure of an electronic device 10 that may be used to implement an embodiment of the invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. Electronic equipment may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 5, the electronic device 10 includes at least one processor 11, and a memory, such as a Read Only Memory (ROM) 12, a Random Access Memory (RAM) 13, etc., communicatively connected to the at least one processor 11, in which the memory stores a computer program executable by the at least one processor, and the processor 11 may perform various appropriate actions and processes according to the computer program stored in the Read Only Memory (ROM) 12 or the computer program loaded from the storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 may also be stored. The processor 11, the ROM 12 and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
Various components in the electronic device 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, etc.; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, an optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunication networks.
The processor 11 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 11 performs the various methods and processes described above, such as satellite data acquisition methods.
In some embodiments, the satellite data acquisition method may be implemented as a computer program tangibly embodied on a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 10 via the ROM 12 and/or the communication unit 19. One or more of the steps of satellite data acquisition described above may be performed when the computer program is loaded into RAM 13 and executed by processor 11. Alternatively, in other embodiments, the processor 11 may be configured to perform the satellite data acquisition method in any other suitable way (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (8)
1. A satellite data acquisition system, comprising: the system comprises a ground system, at least two acquisition terminals and a satellite constellation;
the ground system is used for generating a data acquisition function and transmitting the data acquisition function to the at least two acquisition terminals through the satellite constellation;
the at least two acquisition terminals are used for ground data acquisition and transmit acquired data to the satellite constellation according to the data acquisition function;
The satellite constellation is used for data forwarding between the ground system and the at least two acquisition terminals, wherein the satellite constellation comprises at least one satellite, and each satellite corresponds to at least one acquisition arc segment;
the ground system is specifically used for:
grouping the at least two acquisition terminals to obtain at least one grouping result;
performing function fitting on the at least one grouping result, and determining a fitting result with fitting satisfaction degree larger than a set threshold value as the data acquisition function;
determining the terminal number and average acquisition frequency of the at least two acquisition terminals and the single acquisition capacity of the satellite constellation;
determining the grouping number of the acquisition terminals according to the number of the terminals, the average acquisition frequency and the single acquisition capacity;
dividing the at least two acquisition terminals according to the grouping number, and respectively distributing one acquisition arc section for each group.
2. The system according to claim 1, characterized in that the ground system is specifically adapted to:
acquiring a preset basis function, and terminal identifiers of corresponding acquisition terminals of each group and arc segment identifiers of acquisition arc segments, wherein the basis function is pre-stored in the ground system and the at least two acquisition terminals;
And determining coefficients of the base function, and fitting the base function into a Boolean function, wherein independent variables of the Boolean function are the terminal identification and the arc section identification.
3. The system according to claim 2, characterized in that the ground system is specifically adapted to:
acquiring coefficients of a basis function corresponding to the data acquisition function;
and transmitting coefficients of the basis functions corresponding to the data acquisition functions to the at least two acquisition terminals through the satellite constellation.
4. A system according to claim 3, characterized in that for each of said at least two acquisition terminals, said each acquisition terminal is specifically adapted to:
receiving the data acquisition function;
and determining a strategy evaluation result according to the data acquisition function, and if the strategy evaluation result is transmission, transmitting the acquired data to the satellite constellation.
5. The system of claim 4, wherein each acquisition terminal is specifically configured to:
receiving ephemeris broadcast of the satellite constellation, and determining an optimal time window for data transmission according to the position of the ephemeris broadcast and the current acquisition terminal;
And if the strategy evaluation result is transmission, transmitting the acquired data to the satellite constellation in the optimal time window.
6. A satellite data acquisition method, the method being applied to a satellite data acquisition system, the system comprising: the system comprises a ground system, at least two acquisition terminals and a satellite constellation;
generating a data acquisition function through the ground system, and transmitting the data acquisition function to the at least two acquisition terminals through the satellite constellation;
ground data acquisition is carried out through the at least two acquisition terminals, and acquired data is sent to the satellite constellation according to the data acquisition function;
data forwarding between the ground system and the at least two acquisition terminals is performed through the satellite constellation, wherein the satellite constellation comprises at least one satellite, and each satellite corresponds to at least one acquisition arc segment;
the generating the data acquisition function by the ground system comprises:
grouping the at least two acquisition terminals to obtain at least one grouping result;
performing function fitting on the at least one grouping result, and determining a fitting result with fitting satisfaction degree larger than a set threshold value as the data acquisition function;
The grouping of the at least two acquisition terminals includes:
determining the terminal number and average acquisition frequency of the at least two acquisition terminals and the single acquisition capacity of the satellite constellation;
determining the grouping number of the acquisition terminals according to the number of the terminals, the average acquisition frequency and the single acquisition capacity;
dividing the at least two acquisition terminals according to the grouping number, and respectively distributing one acquisition arc section for each group.
7. An electronic device, the electronic device comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the satellite data acquisition method of claim 6.
8. A computer readable storage medium storing computer instructions for causing a processor to perform the satellite data acquisition method of claim 6.
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