CN114785409B - Random user discrimination method and device for low-orbit satellite access channel - Google Patents
Random user discrimination method and device for low-orbit satellite access channel Download PDFInfo
- Publication number
- CN114785409B CN114785409B CN202210702010.4A CN202210702010A CN114785409B CN 114785409 B CN114785409 B CN 114785409B CN 202210702010 A CN202210702010 A CN 202210702010A CN 114785409 B CN114785409 B CN 114785409B
- Authority
- CN
- China
- Prior art keywords
- random
- code phase
- pseudo code
- target
- correlation peaks
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
Abstract
The invention provides a random user discrimination method and a random user discrimination device for a low-orbit satellite access channel, which relate to the technical field of low-orbit satellite communication, and the method comprises the following steps: acquiring the number of beams and the capturing time of low-orbit satellite beams, and completing the polling capturing of each user-on-hand corresponding to an access channel of the beams based on the number of the beams and the capturing time; acquiring a plurality of correlation peaks of each beam at different moments, and acquiring capture information of any two correlation peaks of the random user; acquiring pseudo code phase estimation difference values of the two correlation peaks based on the acquisition information of the two correlation peaks; and judging whether the random users corresponding to the two correlation peaks are different random users or not based on the pseudo code phase estimation difference value, and confirming the access channel occupied by the random user.
Description
Technical Field
The invention relates to the technical field of low-orbit satellite communication, in particular to a method and a device for screening a casual user of a low-orbit satellite access channel.
Background
Compared with a high-orbit or static orbit satellite, the low-orbit satellite can cover the whole world in a single satellite time-sharing mode, provides low-delay comprehensive services such as voice, messages and images for ground users, has close satellite-ground distance and low transmission loss, and is beneficial to reducing power emission of a terminal, so that the terminal is miniaturized and low-power-consumption design is realized.
The array antenna can improve the gain of the satellite receiving antenna, and a plurality of wide beams are formed on the satellite by adopting a full digital beam forming technology to realize global coverage. The ground terminal can send uplink service signals according to service requirements within the transit time of the satellite without reporting the position of the ground terminal in advance, so that random access is realized. For a satellite, concurrent access to all the opportunistic users in a coverage area is required under the condition that the terminal position is not known, and the satellite is required to have the capability of carrying out opportunistic user detection on all wide-beam uplink signals and setting a schedulable receiving processing channel. Because the satellite receiver is limited by the strict constraints of power consumption and volume design requirements, the operation and storage resources are very limited, and the adoption of multi-beam serial polling capture instead of full parallel capture is the optimal choice under the condition; in addition, there may be multiple satellite users in each wide beam coverage area, and the same satellite user may be captured by multiple beams due to the existence of the beam overlapping region, so the satellite is confronted with a multi-satellite user, cross-beam capture scenario without prior information.
Therefore, how to screen casual users corresponding to access channels of low-orbit satellites is a technical problem which needs to be solved urgently at present.
Disclosure of Invention
The invention provides a random user screening method and device for an access channel of a low-earth orbit satellite, which are used for solving the defect that the same random user is repeatedly occupied due to multiple capture in the prior art, and realize the screening of random users corresponding to the access channel of the low-earth orbit satellite.
The invention provides a random user screening method for a low-orbit satellite access channel, which comprises the following steps:
acquiring the number of beams and the acquisition time of low-orbit satellite beams, and finishing the polling acquisition of each user-on-hand corresponding to the access channel of the beams on the basis of the number of the beams and the acquisition time;
acquiring a plurality of correlation peaks of each beam at different moments, and acquiring capture information of any two correlation peaks of the random user;
acquiring pseudo code phase estimation difference values of the two correlation peaks based on the acquisition information of the two correlation peaks;
and judging whether the random users corresponding to the two correlation peaks are different random users or not based on the pseudo code phase estimation difference value, and confirming the access channel occupied by the random users.
According to the random user discrimination method for the low-orbit satellite access channel provided by the invention, the pseudo code phase estimation difference value of the two correlation peaks is obtained based on the acquisition information of the two correlation peaks, and the method comprises the following steps:
judging whether the Doppler estimated value in the capture information exceeds a preset threshold or not according to the capture information;
and under the condition that the Doppler estimated value in the capture information is determined to exceed a preset threshold, obtaining and recording capture serial numbers of two related peaks corresponding to the capture information, and combining the capture serial numbers with the capture information to obtain target capture information of the two related peaks.
According to the casual user screening method for the low-orbit satellite access channel, provided by the invention, the target acquisition information comprises the following steps: a target Doppler estimated value, a target pseudo code phase estimated value and a target moment;
the obtaining of the pseudo code phase estimation difference value of two correlation peaks based on the target acquisition information includes:
and acquiring a pseudo code phase estimation difference value of two correlation peaks based on the target Doppler estimation value, the target pseudo code phase estimation value and the target moment.
According to the casual user screening method for the low orbit satellite access channel provided by the invention, under the condition that the Doppler estimation value in the capture information is determined to exceed the preset threshold, the capture serial numbers of two related peaks corresponding to the capture information are obtained and recorded, and the capture serial numbers are combined with the capture information to obtain the target capture information of the two related peaks, and the method comprises the following steps:
respectively planning the random users corresponding to the two correlation peaks as a first random user and a second random user under the condition that the Doppler estimation value in the acquisition information exceeds a preset threshold;
acquiring and recording capture serial numbers of two correlation peaks corresponding to the capture information, wherein the capture serial numbers correspond to a first random user and a second random user;
and obtaining a first target Doppler estimated value, a first target pseudo code phase estimated value and a first target time of the first random user, and a second target Doppler estimated value, a second target pseudo code phase estimated value and a second target time of the second random user based on the acquisition sequence number and the acquisition information.
According to the random user discrimination method for the low earth orbit satellite access channel provided by the invention, the pseudo code phase estimation difference value of two correlation peaks is obtained based on the target Doppler estimation value, the target pseudo code phase estimation value and the target time, and the method comprises the following steps:
acquiring an acquisition time difference based on the first target time and the second target time, and acquiring a walking estimation value of a pseudo code phase in the acquisition time difference based on the acquisition time difference and a first target Doppler estimation value;
and acquiring a pseudo code phase estimation difference value of two correlation peaks based on the first target pseudo code phase estimation value, the second target pseudo code phase estimation value and the pseudo code phase walking estimation value.
According to the random user screening method for the low earth orbit satellite access channel provided by the invention, whether random users corresponding to two correlation peaks are different random users is judged based on the pseudo code phase estimation difference value, and the access channel occupied by the random users is confirmed, and the method comprises the following steps:
under the condition that the pseudo code phase estimation difference value is not smaller than a preset threshold value, confirming that two random users are different random users, and confirming that the two random users occupy two different access channels of the low earth orbit satellite;
and under the condition that the pseudo code phase estimation difference value is smaller than a preset threshold value, confirming that the two random users are the same random user, and confirming that the two random users occupy the same access channel of the low-orbit satellite.
According to the random user screening method for the low-orbit satellite access channel provided by the invention, under the condition that the pseudo code phase estimation difference value is smaller than the preset threshold value, two random users are confirmed to be the same random user, and after the two random users are confirmed to occupy the same access channel of the low-orbit satellite, the method further comprises the following steps:
and reducing the access channel shared by the two random users according to the judgment result of the access channel occupied by the random user corresponding to the two correlation peaks.
The invention also provides a random user discriminating device of the low orbit satellite access channel, which comprises:
the beam capturing module is used for acquiring the number of beams and capturing time of low-orbit satellite beams and completing polling capture of each random user corresponding to an access channel of the beams on the basis of the number of beams and the capturing time;
a correlation peak obtaining module, configured to obtain multiple correlation peaks of each beam at different times, and obtain capture information of any two correlation peaks of the random user;
the difference value acquisition module is used for acquiring pseudo code phase estimation difference values of the two correlation peaks based on the acquisition information of the two correlation peaks;
and the screening module is used for judging whether the random users corresponding to the two correlation peaks are different random users or not based on the pseudo code phase estimation difference value and confirming the access channel occupied by the random users.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the random user screening method of the low-orbit satellite access channel.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method for random subscriber screening for low earth orbit satellite access channels as described in any of the above.
The invention provides a random user screening method and device for a low-orbit satellite access channel, which are characterized in that the number of beams and the capturing time of a low-orbit satellite beam are obtained, the polling capturing of each random user in the beam is completed, then a plurality of correlation peaks of each beam at different moments are obtained, the capturing information of any two correlation peaks of the random user is obtained, the pseudo code phase estimation difference of the two correlation peaks is further obtained based on the capturing information of the two correlation peaks, finally whether the random users corresponding to the two correlation peaks are different random users is judged based on the pseudo code phase estimation difference, and the access channel occupied by the random users is confirmed. The method and the device can be used for screening the random users corresponding to the access channel of the low-orbit satellite.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a casual user screening method for a low-earth orbit satellite access channel provided by the present invention;
fig. 2 is a schematic diagram of multi-beam polling acquisition of the casual user screening method for a low-earth orbit satellite access channel provided by the invention;
FIG. 3 is a code Doppler correction diagram of the user-on-hand discrimination method for low-orbit satellite access channels according to the present invention;
fig. 4 is a schematic structural diagram of a casual user screening apparatus for a low-orbit satellite access channel provided in the present invention;
fig. 5 is a schematic structural diagram of an electronic device provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method and apparatus for screening casual users of the low earth orbit satellite access channel of the present invention are described with reference to fig. 1-5.
Referring to fig. 1, the casual user screening method for the low earth orbit satellite access channel provided by the invention comprises the following steps:
and 110, acquiring the number of beams and the acquisition time of the low-orbit satellite beams, and completing the polling acquisition of each satellite user corresponding to the access channel of the beams based on the number of beams and the acquisition time.
Specifically, the multi-beam polling acquisition strategy is designed in this embodiment, and it should be emphasized that the beams in this embodiment are all wide beams. Let N denote the number of wide beams and each wide beam acquisition time be M symbols. Referring to fig. 2, the polling state machine generates a gating signal which jumps once every M symbols and inputs the gating signal into the beam polling switch, controls the input data of the capturing module to perform cyclic gating input between beams 1-N, and completes polling capture of all the random access random users in the primary wide beam in M × N symbol times.
And step 120, acquiring a plurality of correlation peaks of each beam at different time, and acquiring acquisition information of any two correlation peaks of the random user.
Specifically, in this embodiment, the time when different opportunistic users arrive at the receiver is different, so that different opportunistic users present different initial phases of the spreading codes in the acquisition stage, and the initial phases of the spreading codes indicate that the relative times when different opportunistic users arrive at the receiver are different, and provide a basis for the separation of multiple opportunistic users, that is, by comparing multiple correlation peaks captured at the same time, the opportunistic users corresponding to the correlation peaks are discriminated.
And step 130, acquiring a pseudo code phase estimation difference value of the two correlation peaks based on the acquisition information of the two correlation peaks.
Specifically, the pseudo code phase estimation difference between two correlation peaks is obtained through calculation, and whether the difference is within three chips is determined, so that the casual users are further screened. The discrimination threshold is three chips, which can be adjusted according to the actual situation, and is not specifically limited herein.
And step 140, judging whether the random users corresponding to the two correlation peaks are different random users based on the pseudo code phase estimation difference, and confirming the access channel occupied by the random users.
Specifically, in this embodiment, through the confirmation of the discrimination result, it is obtained whether the random users corresponding to the two correlation peaks are the same random user or different random users, so as to confirm whether the random user occupies one access channel or two access channels.
The invention provides a random user screening method of a low-orbit satellite access channel, which is characterized in that the number of beams and the capturing time of a low-orbit satellite beam are obtained, the polling capturing of each random user in the beam is completed, then a plurality of correlation peaks of each beam at different moments are obtained, the capturing information of any two correlation peaks of the random user is obtained, the pseudo code phase estimation difference value of the two correlation peaks is further obtained based on the capturing information of the two correlation peaks, finally whether random users corresponding to the two correlation peaks are different random users is judged based on the pseudo code phase estimation difference value, and the access channel occupied by the random users is confirmed. The method and the device can be used for screening the random users corresponding to the access channel of the low-orbit satellite.
Based on the above embodiment, the obtaining a pseudo code phase estimation difference value of two correlation peaks based on the acquisition information of the two correlation peaks includes:
judging whether the Doppler estimated value in the capture information exceeds a preset threshold or not according to the capture information;
and under the condition that the Doppler estimated value in the capture information is determined to exceed a preset threshold, obtaining and recording capture serial numbers of two related peaks corresponding to the capture information, and combining the capture serial numbers with the capture information to obtain target capture information of the two related peaks.
The target capture information includes: a target Doppler estimated value, a target pseudo code phase estimated value and a target moment;
the obtaining of the pseudo code phase estimation difference value of two correlation peaks based on the target acquisition information includes:
and acquiring a pseudo code phase estimation difference value of two correlation peaks based on the target Doppler estimation value, the target pseudo code phase estimation value and the target moment.
Specifically, in the embodiment, when the doppler estimation value of the correlation peak exceeds a preset threshold, the acquisition information of the random user needs to be recorded. As shown in the following equation:
wherein the content of the first and second substances,
the doppler estimation value, the pseudo code phase estimation value, and the time of the correlation peak that has passed the threshold at the ith time are respectively represented, that is, the doppler estimation value, the pseudo code phase estimation value, and the target time of the target correspond to the case where the number of times of the target exceeds the preset threshold by the encounter user in this embodiment.
It should be noted that, although the doppler information in this embodiment is an estimated value of true doppler caused by relative motion between the low-earth satellite and the ground terminal, the doppler estimation error when the cross-symbol coherent accumulation is adopted can be lower than Rs/64, where Rs is the symbol rate.
Based on the above embodiment, in a case that it is determined that the doppler estimation value in the acquisition information exceeds a preset threshold, acquiring and recording acquisition sequence numbers of two correlation peaks corresponding to the acquisition information, and combining the acquisition sequence numbers with the acquisition information to obtain target acquisition information of the two correlation peaks, including:
respectively planning the random users corresponding to the two correlation peaks as a first random user and a second random user under the condition that the Doppler estimation value in the acquisition information exceeds a preset threshold;
acquiring and recording capture serial numbers of two correlation peaks corresponding to the capture information, wherein the capture serial numbers correspond to a first random user and a second random user;
and obtaining a first target Doppler estimated value, a first target pseudo code phase estimated value and a first target time of the first random user, and a second target Doppler estimated value, a second target pseudo code phase estimated value and a second target time of the second random user based on the acquisition sequence number and the acquisition information.
Specifically, in this embodiment, under the condition that the doppler estimation value exceeds the preset threshold, the random users corresponding to the two correlation peaks are respectively planned to be the first random user and the second random user. Then obtainThe target capture information of the first random user and the second random user comprises the following steps: first target Doppler estimate
The first target pseudo code phase estimation value
And a first target time
Second target Doppler estimate for a second satellite user
The second target pseudo code phase estimation value
And a second target time
。
Referring to FIG. 3, in
And
when the time respectively captures the random users, if the pseudo code phases captured by the random users are directly distinguished, then
And
the value of (a) may exceed the guard interval of the pseudo code phase estimation value of 3 chips due to the existence of doppler, so that a calculation method for correcting the doppler information estimation value is required.
Based on the above embodiments, acquiring a pseudo code phase estimation difference value of two correlation peaks based on the target doppler estimation value, the target pseudo code phase estimation value, and the target time includes:
acquiring an acquisition time difference based on the first target time and the second target time, and acquiring a walking estimation value of a pseudo code phase in the acquisition time difference based on the acquisition time difference and a first target Doppler estimation value;
and acquiring a pseudo code phase estimation difference value of two correlation peaks based on the first target pseudo code phase estimation value, the second target pseudo code phase estimation value and the pseudo code phase walking estimation value.
The calculation method adopted in this embodiment is that, first, with the first random user as a reference, the time difference between two captures is calculated by the following formula:
wherein the content of the first and second substances,
and
respectively a second target time and a first target time.
Then, the time difference is multiplied by the doppler estimated value of the first random user to obtain the walking estimated value of the pseudo code phase in the acquisition time difference, as shown in the following formula:
finally, will
The estimator converts the estimated value of the code phase into the difference value of the estimated values of the code phases of the first target pseudo code phase estimation value and the second target pseudo code phase estimation value, and obtains the pseudo code phase estimation difference value of two correlation peaks, as shown in the following formula:
wherein the content of the first and second substances,
the pseudo-code phase estimate difference of the two correlation peaks,
is the second target pseudo-code phase estimate,
is the first pseudo-code phase estimate of interest,
is a running estimate of the pseudo-code phase.
Based on the above embodiments, determining whether the random users corresponding to the two correlation peaks are different random users based on the pseudo code phase estimation difference, and determining the access channel occupied by the random user includes:
under the condition that the pseudo code phase estimation difference value meets a code sheet which is not less than a preset threshold value, confirming that two random users are different random users, and confirming that the two random users occupy two different access channels of the low-orbit satellite;
and under the condition that the pseudo code phase estimation difference value meets a code chip smaller than a preset threshold value, confirming that the two random users are the same random user, confirming that the second random user is a repeated random user of the first random user, and confirming that the two random users occupy one access channel of the low-orbit satellite.
Specifically, in this embodiment, the pseudo code phase estimation difference of the two correlation peaks calculated by the formula (4) is compared with a preset threshold, so as to determine whether the two random users are the same random user. I.e. comparing whether the two are within 3 chips of the preset threshold value, as follows:
if it is
And then, considering the two acquired random users as different random users, wherein the two random users respectively occupy one access channel of the low-orbit satellite.
If it is
If the two are considered to be the same random user, a new receiving channel is not allocated to the random user, but the random user continues to complete operations such as despreading, demodulation, decoding and the like in the original receiving channel.
Based on the above embodiment, when the pseudo code phase estimation difference value is smaller than the preset threshold, determining that the two random users are the same random user, and after determining that the two random users occupy the same access channel of the low earth orbit satellite, the method further includes:
and reducing the access channel shared by the two random users according to the judgment result of the access channel occupied by the random user corresponding to the two correlation peaks.
The implementation discriminates the random users and then reduces the public access channel of the two random users, thereby solving the problem that the limited access channel of the load receiver of the low-orbit satellite is repeatedly occupied because the same user is captured for many times. The following describes the casual user screening device for the low-orbit satellite access channel provided by the invention, and the casual user screening device for the low-orbit satellite access channel described below and the casual user screening method for the low-orbit satellite access channel described above can be referred to correspondingly.
Referring to fig. 4, the present invention further provides a casual user screening apparatus for a low earth orbit satellite access channel, including:
a beam acquisition module 410, configured to acquire the number of beams and the acquisition time of a low-orbit satellite beam, and complete polling acquisition of each satellite user in the beam based on the number of beams and the acquisition time;
a correlation peak obtaining module 420, configured to obtain multiple correlation peaks of each beam at different time and capture information of any two correlation peaks of a random user;
a difference obtaining module 430, configured to obtain a pseudo code phase estimation difference of the two correlation peaks based on the captured information of the two correlation peaks;
a screening module 440, configured to determine whether the random users corresponding to the two correlation peaks are different random users based on the pseudo code phase estimation difference, and determine an access channel occupied by the random user.
Based on the above embodiment, the difference obtaining module is specifically configured to:
judging whether the Doppler estimated value in the capture information exceeds a preset threshold or not according to the capture information;
and under the condition that the Doppler estimated value in the acquisition information exceeds a preset threshold, acquiring and recording acquisition serial numbers of two correlation peaks corresponding to the acquisition information, and combining the acquisition serial numbers with the acquisition information to obtain target acquisition information of the two correlation peaks.
Based on the above embodiment, the difference obtaining module is specifically configured to:
the target capture information includes: a target Doppler estimated value, a target pseudo code phase estimated value and a target moment;
the obtaining of the pseudo code phase estimation difference value of two correlation peaks based on the target acquisition information includes:
and acquiring a pseudo code phase estimation difference value of two correlation peaks based on the target Doppler estimation value, the target pseudo code phase estimation value and the target moment.
Based on the above embodiment, the difference obtaining module is specifically configured to:
respectively planning the random users corresponding to the two correlation peaks as a first random user and a second random user under the condition that the Doppler estimated value in the acquisition information exceeds a preset threshold;
and acquiring and recording a first target Doppler estimated value, a first target pseudo code phase estimated value and a first target time of a first random user, and a second target Doppler estimated value, a second target pseudo code phase estimated value and a second target time of a second random user.
Based on the above embodiment, the difference obtaining module is specifically configured to:
respectively planning the random users corresponding to the two correlation peaks as a first random user and a second random user under the condition that the Doppler estimation value in the acquisition information exceeds a preset threshold;
acquiring and recording capture serial numbers of two correlation peaks corresponding to the capture information, wherein the capture serial numbers correspond to a first random user and a second random user;
and obtaining a first target Doppler estimated value, a first target pseudo code phase estimated value and a first target time of the first random user, and a second target Doppler estimated value, a second target pseudo code phase estimated value and a second target time of the second random user based on the acquisition sequence number and the acquisition information.
Based on the above embodiment, acquiring an acquisition time difference based on the first target time and the second target time, and obtaining a walking estimation value of a pseudo code phase in the acquisition time difference based on the acquisition time difference and a first target doppler estimation value;
and acquiring a pseudo code phase estimation difference value of two correlation peaks based on the first target pseudo code phase estimation value, the second target pseudo code phase estimation value and the pseudo code phase walking estimation value.
Based on the above embodiment, the screening module is specifically configured to:
under the condition that the pseudo code phase estimation difference value is not smaller than a preset threshold value, confirming that two random users are different random users, and confirming that the two random users occupy two different access channels of the low earth orbit satellite;
and under the condition that the pseudo code phase estimation difference value is smaller than a preset threshold value, confirming that the two random users are the same random user, and confirming that the two random users occupy the same access channel of the low-orbit satellite.
Based on the above embodiment, further include:
and the reduction module is used for reducing the access channel shared by the two random users according to the judgment result of the access channel occupied by the random user corresponding to the two correlation peaks.
Fig. 5 illustrates a physical structure diagram of an electronic device, which may include, as shown in fig. 5: a processor (processor)510, a communication Interface (Communications Interface)520, a memory (memory)530 and a communication bus 540, wherein the processor 510, the communication Interface 520 and the memory 530 communicate with each other via the communication bus 540. Processor 510 may invoke logic instructions in memory 530 to perform a method for on-premises subscriber screening for low earth orbit satellite access channels, the method comprising:
acquiring the number of beams and the capturing time of low-orbit satellite beams, and completing the polling capturing of each user-on-hand corresponding to an access channel of the beams based on the number of the beams and the capturing time;
acquiring a plurality of correlation peaks of each beam at different moments, and acquiring capture information of any two correlation peaks of the random user;
acquiring pseudo code phase estimation difference values of the two correlation peaks based on the acquisition information of the two correlation peaks;
and judging whether the random users corresponding to the two correlation peaks are different random users or not based on the pseudo code phase estimation difference value, and confirming the access channel occupied by the random users.
Furthermore, the logic instructions in the memory 530 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, the present invention further provides a computer program product, the computer program product including a computer program, the computer program being stored on a non-transitory computer-readable storage medium, wherein when the computer program is executed by a processor, the computer is capable of executing the method for screening users for low-earth orbit satellite access channel provided by the above methods, the method includes:
acquiring the number of beams and the capturing time of low-orbit satellite beams, and completing the polling capturing of each user-on-hand corresponding to an access channel of the beams based on the number of the beams and the capturing time;
acquiring a plurality of correlation peaks of each beam at different moments, and acquiring capture information of any two correlation peaks of the random user;
acquiring pseudo code phase estimation difference values of the two correlation peaks based on the acquisition information of the two correlation peaks;
and judging whether the random users corresponding to the two correlation peaks are different random users or not based on the pseudo code phase estimation difference value, and confirming the access channel occupied by the random users.
In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored, the computer program, when being executed by a processor, implementing a method for random subscriber screening for low-earth orbit satellite access channels provided by the above methods, the method including:
acquiring the number of beams and the acquisition time of low-orbit satellite beams, and finishing the polling acquisition of each user-on-hand corresponding to the access channel of the beams on the basis of the number of the beams and the acquisition time;
acquiring a plurality of correlation peaks of each beam at different moments, and acquiring capture information of any two correlation peaks of the random user;
acquiring pseudo code phase estimation difference values of the two correlation peaks based on the acquisition information of the two correlation peaks;
and judging whether the random users corresponding to the two correlation peaks are different random users or not based on the pseudo code phase estimation difference value, and confirming the access channel occupied by the random users.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A random user discrimination method for a low-orbit satellite access channel is characterized by comprising the following steps:
acquiring the number of beams and the capturing time of low-orbit satellite beams, and completing the polling capturing of each user-on-hand corresponding to an access channel of the beams based on the number of the beams and the capturing time;
acquiring a plurality of correlation peaks of each beam at different moments, and acquiring capture information of any two correlation peaks of the random user;
acquiring pseudo code phase estimation difference values of the two correlation peaks based on the acquisition information of the two correlation peaks;
judging whether the random users corresponding to the two correlation peaks are different random users or not based on the pseudo code phase estimation difference value, and confirming access channels occupied by the random users;
judging whether the random users corresponding to the two correlation peaks are different random users or not based on the pseudo code phase estimation difference value, and confirming the access channel occupied by the random users, wherein the method comprises the following steps:
under the condition that the pseudo code phase estimation difference value is not less than a preset threshold value, confirming that two random users are different random users, and confirming that the two random users occupy two different access channels of the low earth orbit satellite;
and under the condition that the pseudo code phase estimation difference value is smaller than a preset threshold value, confirming that the two random users are the same random user, and confirming that the two random users occupy the same access channel of the low-orbit satellite.
2. The method for screening casual users of a low earth orbit satellite access channel according to claim 1, wherein the obtaining a pseudo code phase estimation difference of two correlation peaks based on the captured information of the two correlation peaks comprises:
judging whether the Doppler estimated value in the capture information exceeds a preset threshold or not according to the capture information;
and under the condition that the Doppler estimated value in the capture information is determined to exceed a preset threshold, obtaining and recording capture serial numbers of two related peaks corresponding to the capture information, and combining the capture serial numbers with the capture information to obtain target capture information of the two related peaks.
3. The method for screening casual users of a low earth orbit satellite access channel of claim 2, wherein the target acquisition information comprises: a target Doppler estimated value, a target pseudo code phase estimated value and a target moment;
the obtaining of the pseudo code phase estimation difference value of two correlation peaks based on the target acquisition information includes:
and acquiring a pseudo code phase estimation difference value of two correlation peaks based on the target Doppler estimation value, the target pseudo code phase estimation value and the target moment.
4. The casual user screening method of the low earth orbit satellite access channel according to claim 2, wherein under the condition that it is determined that the doppler estimation value in the acquisition information exceeds a preset threshold, acquiring and recording acquisition sequence numbers of two correlation peaks corresponding to the acquisition information, and combining the acquisition sequence numbers with the acquisition information to obtain target acquisition information of the two correlation peaks, the method comprises:
respectively planning the random users corresponding to the two correlation peaks as a first random user and a second random user under the condition that the Doppler estimation value in the acquisition information exceeds a preset threshold;
acquiring and recording capture serial numbers of two correlation peaks corresponding to the capture information, wherein the capture serial numbers correspond to a first random user and a second random user;
and obtaining a first target Doppler estimated value, a first target pseudo code phase estimated value and a first target time of the first random user, and a second target Doppler estimated value, a second target pseudo code phase estimated value and a second target time of the second random user based on the acquisition sequence number and the acquisition information.
5. The satellite-based casual user screening method for the low earth orbit satellite access channel according to claim 4, wherein obtaining the pseudo code phase estimation difference of two correlation peaks based on the target Doppler estimation value, the target pseudo code phase estimation value and the target time comprises:
acquiring an acquisition time difference based on the first target time and the second target time, and acquiring a walking estimated value of a pseudo code phase in the acquisition time difference based on the acquisition time difference and a first target Doppler estimated value;
and acquiring a pseudo code phase estimation difference value of two correlation peaks based on the first target pseudo code phase estimation value, the second target pseudo code phase estimation value and the pseudo code phase walking estimation value.
6. The method for screening random users of a low earth orbit satellite access channel according to claim 1, wherein when the pseudo code phase estimation difference is smaller than a preset threshold, it is determined that two random users are the same random user, and after it is determined that two random users occupy the same access channel of a low earth orbit satellite, the method further comprises:
and reducing the access channel shared by the two random users according to the judgment result of the access channel occupied by the random user corresponding to the two correlation peaks.
7. An casual user screening device for a low-orbit satellite access channel is characterized by comprising:
the beam acquisition module is used for acquiring the beam number and the acquisition time of a low-orbit satellite beam and finishing the polling acquisition of each user on occasion in the beam based on the beam number and the acquisition time;
the relevant peak acquisition module is used for acquiring a plurality of relevant peaks of each beam at different moments and acquisition information of any two relevant peaks of the random user;
the difference value acquisition module is used for acquiring pseudo code phase estimation difference values of the two correlation peaks based on the acquisition information of the two correlation peaks;
the discrimination module is used for judging whether the random users corresponding to the two correlation peaks are different random users or not based on the pseudo code phase estimation difference value and confirming the access channel occupied by the random users;
the screening module is specifically configured to: under the condition that the pseudo code phase estimation difference value is not smaller than a preset threshold value, confirming that two random users are different random users, and confirming that the two random users occupy two different access channels of the low earth orbit satellite;
and under the condition that the pseudo code phase estimation difference value is smaller than a preset threshold value, confirming that the two random users are the same random user, and confirming that the two random users occupy the same access channel of the low-orbit satellite.
8. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the method for on-user screening for low earth satellite access channels according to any one of claims 1 to 6.
9. A non-transitory computer readable storage medium having a computer program stored thereon, wherein the computer program when executed by a processor implements the method for casual subscriber screening for low earth orbit satellite access channels according to any of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210702010.4A CN114785409B (en) | 2022-06-21 | 2022-06-21 | Random user discrimination method and device for low-orbit satellite access channel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210702010.4A CN114785409B (en) | 2022-06-21 | 2022-06-21 | Random user discrimination method and device for low-orbit satellite access channel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114785409A CN114785409A (en) | 2022-07-22 |
| CN114785409B true CN114785409B (en) | 2022-09-30 |
Family
ID=82420826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210702010.4A Active CN114785409B (en) | 2022-06-21 | 2022-06-21 | Random user discrimination method and device for low-orbit satellite access channel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114785409B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104702547A (en) * | 2014-09-25 | 2015-06-10 | 上海欧科微航天科技有限公司 | Pilot frequency information and satellite ephemeris joint Doppler frequency shift estimation and compensation method |
| CN108696945A (en) * | 2018-05-11 | 2018-10-23 | 西安空间无线电技术研究所 | A kind of accidental access method towards LEO satellite communication systems |
| CN111726744A (en) * | 2019-03-21 | 2020-09-29 | 电信科学技术研究院有限公司 | Random access method, device and terminal |
| CN113452401A (en) * | 2021-08-30 | 2021-09-28 | 北京理工大学 | Multi-user detection and separation system, method, electronic device and storage medium |
| CN113452405A (en) * | 2021-08-31 | 2021-09-28 | 北京理工大学 | Signal processing method and device of satellite-borne receiver, electronic equipment and storage medium |
| CN113552601A (en) * | 2021-06-29 | 2021-10-26 | 中国人民解放军国防科技大学 | Delayed autocorrelation capturing method, device and system for low-earth-orbit satellite navigation signals |
| CN113872909A (en) * | 2021-09-28 | 2021-12-31 | 东方红卫星移动通信有限公司 | Low-earth-orbit satellite Internet of things short-time burst carrier capturing method and system |
| WO2022027383A1 (en) * | 2020-08-05 | 2022-02-10 | 北京小米移动软件有限公司 | Random access method and apparatus, and device and storage medium |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11115116B2 (en) * | 2017-08-22 | 2021-09-07 | eSAT Global, Inc. | Low data volume satellite communication system |
-
2022
- 2022-06-21 CN CN202210702010.4A patent/CN114785409B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104702547A (en) * | 2014-09-25 | 2015-06-10 | 上海欧科微航天科技有限公司 | Pilot frequency information and satellite ephemeris joint Doppler frequency shift estimation and compensation method |
| CN108696945A (en) * | 2018-05-11 | 2018-10-23 | 西安空间无线电技术研究所 | A kind of accidental access method towards LEO satellite communication systems |
| CN111726744A (en) * | 2019-03-21 | 2020-09-29 | 电信科学技术研究院有限公司 | Random access method, device and terminal |
| WO2022027383A1 (en) * | 2020-08-05 | 2022-02-10 | 北京小米移动软件有限公司 | Random access method and apparatus, and device and storage medium |
| CN113552601A (en) * | 2021-06-29 | 2021-10-26 | 中国人民解放军国防科技大学 | Delayed autocorrelation capturing method, device and system for low-earth-orbit satellite navigation signals |
| CN113452401A (en) * | 2021-08-30 | 2021-09-28 | 北京理工大学 | Multi-user detection and separation system, method, electronic device and storage medium |
| CN113452405A (en) * | 2021-08-31 | 2021-09-28 | 北京理工大学 | Signal processing method and device of satellite-borne receiver, electronic equipment and storage medium |
| CN113872909A (en) * | 2021-09-28 | 2021-12-31 | 东方红卫星移动通信有限公司 | Low-earth-orbit satellite Internet of things short-time burst carrier capturing method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114785409A (en) | 2022-07-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6430216B1 (en) | Rake receiver for spread spectrum signal demodulation | |
| EP1034677B1 (en) | Method and system for determining position of mobile radio terminals | |
| US6745050B1 (en) | Multichannel multiuser detection | |
| US6754511B1 (en) | Linear signal separation using polarization diversity | |
| RU2179371C1 (en) | Gear and procedure determining position of mobile station in mobile communication system | |
| KR101194211B1 (en) | Methods and apparatuses for processing satellite positioning system signals | |
| US6947474B2 (en) | Rake receiver for spread spectrum signal demodulation | |
| CN114785409B (en) | Random user discrimination method and device for low-orbit satellite access channel | |
| EP1909112A1 (en) | Fast user terminal position determination in a satellite communications system | |
| Arribas et al. | Air traffic control radar interference event in the Galileo E6 band: Detection and localization | |
| CN110098881B (en) | Wide-narrow beam signal transmission method and device and electronic equipment | |
| Yang et al. | Collision and detection performance with three overlap signal collisions in space-based AIS reception | |
| CN114422020B (en) | Method, system and medium for navigation service of broadband satellite communication system | |
| CN116321183A (en) | Method, system and electronic equipment for coordinating interference | |
| US9270444B2 (en) | Signal detector device and signal detection method | |
| Gappmair et al. | New results on location-aware channel estimation for multibeam satellite links | |
| CN114727408B (en) | Beam dynamic optimization method and device, electronic equipment and storage medium | |
| JP4633667B2 (en) | Array antenna transmitter | |
| EP1178614A2 (en) | CDMA receiving apparatus and method | |
| CN110346818B (en) | Method and device for inhibiting cross correlation in GNSS signal capture | |
| CN117471498B (en) | Navigation spoofing signal detection method and device for multi-beam array receiver | |
| RU2611606C1 (en) | Method of adaptation of modes of transmitting information over satellite communication channels in conditions of atmospheric disturbances and device for its implementation | |
| Qu et al. | A Study of Irregular Repetition Slotted ALOHA Over LEO Satellite Channel with Capture Effect | |
| US7940835B2 (en) | Method of eliminating false echoes of a signal and corresponding rake receiver | |
| CN116743226B (en) | Open sea ocean burst communication system and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |