CN114884537B - Intelligent cognitive joint capturing method and system for multi-beam time division access signals - Google Patents
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Abstract
The application relates to an intelligent cognitive combined capturing method and system for multi-beam time division access signals. The method comprises the following steps: allocating capturing tasks of specific numbers of different lead codes to a single processing channel of a signal capturing unit, presetting response outbound subframe numbers of the lead codes, and determining arrival time periods of the lead codes according to the response outbound subframe numbers; searching lead code information appointed in the IP data packet according to a preset searching sequence, extracting sampling data sections from the searched IP data packet, and splicing the sampling data sections according to the sequence of receiving the IP data packet to obtain a sampling data stream; and performing correlation operation on the sampling data streams at different moments and different local spread spectrum codes, and calling the corresponding local spread spectrum codes by using a signal capturing unit in each lead code arrival time period to complete lead code signal capturing. By adopting the method, the operation amount in the signal capturing process can be reduced.
Description
Technical Field
The application relates to the technical field of satellite communication, in particular to an intelligent cognitive combined capturing method and system for multi-beam time division access signals.
Background
The satellite communication system mainly comprises a space section, a ground control center and a user section, wherein the space section comprises a satellite constellation comprising a plurality of satellites, and the satellites (outbound transponders and inbound transponders) are used for forwarding outbound signals sent by the ground center station and inbound signals sent by user equipment, so that the satellite communication system has certain anti-interference capability. The ground control center completes the receiving and sending measurement of the user signal and the receiving and sending processing of the information, and manages and controls the operation of the whole system. The user segment is a user equipment terminal with a satellite message receiving and sending function, receives data service and control messages from a ground control center, and sends inbound messages in a random access mode to realize the functions of positioning, timing, short message communication and the like. The satellite communication system comprises a plurality of GEOs (geostationary earth orbit satellites), MEOs (medium orbit satellites) and LEOs (low orbit satellites), wherein each satellite has a plurality of inbound beams covering the ground, different beams of the same satellite are partially overlapped under the general condition, and different beams of different satellites are also overlapped, namely inbound signals sent by a user machine in an overlapping area are received by the plurality of satellites and/or the plurality of beams, are transparently forwarded or regeneratively forwarded to a ground control center and are received by a plurality of distributed antennas of the ground control center.
The current typical method for acquiring and processing the inbound signal in the satellite communication system is as follows: 1) the user equipment sends the inbound signals to the high/medium/low orbit satellite in a random access mode according to the service requirements of the user equipment, so the inbound signals have the characteristics of randomness and short burst; 2) the ground control center receives the inbound signal of satellite transparent retransmission or regenerative retransmission: after each distributed antenna, an independent radio frequency receiving link is arranged for each inbound wave beam, a radio frequency analog signal is changed into a digital baseband signal, IP data packet framing is completed according to a protocol, a Vlan tag corresponding to the wave beam is marked, the digital baseband signal is sent to an exchanger, the exchanger forwards the IP data packet of each wave beam to a corresponding signal capturing unit according to the Vlan tag, and each signal capturing unit processes the IP data packet of 1 wave beam. 3) The signal capturing unit extracts the sampling data sections of the IP data packets, and then splices the sampling data sections according to the sequence of receiving the IP data packets to restore the sampling data stream form. And then carrying out correlation operation on the sampled data stream, wherein the correlation operation refers to a process of carrying out exclusive-nor operation on a local spreading code of a certain user and the sampled data stream according to bits and then adding operation results of each bit to obtain a correlation peak value, if the correlation peak value is greater than or equal to a preset threshold value, judging that a synchronization head or a Preamble (Preamble) of an inbound signal of the user is captured, and taking a start bit of the correlation operation as a start bit of the synchronization head or the Preamble (Preamble) of the user. Each correlation operation takes one sampling point in the sampling data section as a starting point, moves to the next sampling point after the correlation operation is completed as an operation starting point, and so on, the signal capturing unit needs to traverse all the sampling points in the sampling data section of the IP data packet to obtain the lead code of a certain user. 4) When the synchronization headers or preambles of the users are different, the signal acquisition unit needs to repeat step 3) for each different preamble until the acquisition of all users is completed.
Therefore, in the current satellite communication system, the computation amount of the inbound signal acquisition is large, and a large amount of computing resources are consumed, so that it is necessary to improve the inbound signal acquisition, reduce the computation amount, reduce the computation overhead, and improve the system service capacity.
Disclosure of Invention
In view of the foregoing, it is desirable to provide an intelligent cognitive joint acquisition method and system for a multi-beam time division access signal, which can reduce the computation in the signal acquisition process.
A method for intelligent cognitive joint acquisition of a multi-beam time division access signal, the method comprising:
acquiring a plurality of single beam inbound signals;
preprocessing the single-beam inbound signal to obtain a tag beam; the tag beam represents a beam containing a Vlan tag;
forwarding the IP data packets of all beams of all satellites to each signal capturing unit according to the Vlan tag of the tag beam;
allocating capturing tasks of specific numbers of different lead codes to a single processing channel of a signal capturing unit, presetting response outbound subframe numbers of the lead codes, and determining arrival time periods of the lead codes according to the response outbound subframe numbers; the specific number is the number of the lead codes which can be processed by a single channel of the signal acquisition unit at most;
searching lead code information appointed in the IP data packet according to a preset searching sequence, extracting sampling data sections from the searched IP data packet, and splicing the sampling data sections according to the sequence of receiving the IP data packet to obtain a sampling data stream;
and performing correlation operation on the sampling data streams at different moments and different local spread spectrum codes, and calling the corresponding local spread spectrum codes by using a signal capturing unit in each lead code arrival time period to complete lead code signal capturing.
In one embodiment, if an allocation manner that 1 preamble is allocated to 1 user is adopted, when the signal acquisition unit acquires an IP data packet of a next beam of the same satellite, the signal acquisition unit may acquire the preamble signal by using acquisition information acquired by a previous beam.
In one embodiment, the specific number of calculation processes is
Wherein,T subframe is the duration of the outbound subframe;t min is the minimum transmission time delay of the space propagation required by the ground control center for transmitting the inquiry signal to the corresponding user equipment response signal,t max is the corresponding maximum bi-directional transmission delay.
In one embodiment, the preset search order comprises a first search order and a second search order; the first search order is the processing order of the Vlan tag; the second search sequence is to search for IP packets corresponding to the inbound beam of the user equipment.
In one embodiment, if a plurality of users share 1 preamble, the signal acquisition unit searches for preamble information specified in the IP data packet by using a first search order;
if 1 user dedicates 1 lead code, the signal capturing unit searches lead code information appointed in the IP data packet by adopting a second searching sequence;
for the mobile user equipment, the processing sequence of the IP data packet is adjusted in real time according to the last inbound beam number and the inbound signal strength of the mobile user equipment, and the signal capturing unit preferentially processes the IP data packet corresponding to the stronger signal beam.
In one embodiment, determining each preamble arrival time period based on the response outbound subframe number comprises:
presetting the response outbound subframe number of n different lead codes as K, and setting the time period of the user responding to the outbound subframe number as K i T subframe +[t min ,t max ]Obtaining the time period K of the ith lead code reaching the ground control center i T subframe +2[t min , t max ]。
In one embodiment, preprocessing a single beam inbound signal to obtain a tag beam includes:
and performing down-conversion, filtering and sampling quantization on the single-beam inbound signal, converting the radio-frequency analog signal into a digital baseband signal, completing IP data packet framing according to a protocol, and printing a Vlan tag corresponding to the single beam to obtain a tag beam.
An intelligent cognitive joint acquisition system for a multi-beam time division access signal, the system comprising: the system comprises user equipment and a ground control center, wherein the ground control center consists of a transmitting link and a receiving link;
the method comprises the steps that an outbound signal is generated by a transmitting link of a ground control center, sent to a satellite and forwarded to a user through the satellite, the outbound signal is divided into a superframe and subframe structure in a time domain, 1 superframe is composed of a plurality of subframes, and the text of each subframe carries a corresponding outbound subframe number to indicate which subframe the subframe belongs to;
the receiving link of the ground control center is composed of a receiving antenna, a radio frequency sampling unit, an exchanger, a signal capturing unit and the like, each inbound wave beam is provided with an independent radio frequency receiving link, the radio frequency sampling unit preprocesses the single-wave beam inbound signals to obtain a tag wave beam, and the tag wave beam is sent to the exchanger; the switch forwards IP data packets of all beams of all satellites to each signal capturing unit according to the Vlan tag, a specific number of capturing tasks of different lead codes are distributed to a single processing channel of the signal capturing unit, a specific number of different lead codes are distributed to each signal capturing unit, the different lead codes reach a ground control center within respective specified time periods, and the signal capturing unit completes capturing the corresponding lead codes within known arrival time periods of the lead codes;
the user equipment receives the outbound signal and transmits the inbound signal at the outbound signal reference time stamp corresponding to the specified outbound subframe number using the specified preamble.
According to the intelligent cognitive combined capturing method and system for the multi-beam time division access signals, the response outbound subframe number of each lead code inbound is preset, the ground control center predicts the arrival time period of each lead code signal according to the response outbound subframe number, and the signal capturing unit searches the appointed lead code in all inbound beams of all satellites in a determined time period without traversing all sampling points, so that the capturing complexity is greatly reduced, the computation amount is reduced, and the receiving processing capacity of the ground control center is improved. Meanwhile, in order to further improve the capturing speed, aiming at different lead codes, the signal capturing unit adopts channel sensing to adjust the processing sequence of each beam in real time, and the capturing complexity is reduced. The system can process more inbound signals of different preambles on the same computational resource.
Drawings
Fig. 1 is a schematic flowchart of an intelligent cognitive joint acquisition method for multi-beam time division access signals according to an embodiment;
FIG. 2 is a diagram illustrating an embodiment of a terrestrial control center receive link architecture;
FIG. 3 is a diagram of a response outbound subframe number K in one embodiment 0 Timing diagrams of inbound signal streams;
FIG. 4 is a diagram illustrating the correlation operation of the signal acquisition unit processing n preambles according to one embodiment;
fig. 5 is a data frame format of an inbound signal according to one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, there is provided an intelligent cognitive joint acquisition method for a multi-beam time division access signal, including the following steps:
step 102, obtaining a plurality of single-beam inbound signals; preprocessing the single-beam inbound signal to obtain a tag beam; the tag beam represents a beam containing a Vlan tag; the IP packets for all beams of all satellites are forwarded to each signal acquisition unit according to the Vlan tag of the tag beam.
As shown in fig. 2, which is a schematic diagram of a receiving link architecture of a terrestrial control center, each inbound beam of the terrestrial control center has an independent receiving link, and each receiving link is composed of a receiving antenna (shared by multiple receiving links), a radio frequency sampling unit, an exchange (shared by all receiving links), a signal capturing unit, and the like. The radio frequency sampling unit completes down conversion, filtering and sampling quantification of a single beam inbound signal, converts a radio frequency analog signal into a digital baseband signal, completes IP data packet framing according to a protocol, and stamps a Vlan tag corresponding to the beam to send to a high-speed switch. The high speed switch forwards the IP packets for all beams of all satellites to each signal acquisition unit according to the Vlan tag. Each signal acquisition unit is allocated with n different preambles, the different preambles arrive at the ground control center within respective specified time periods, and the signal acquisition units complete acquisition of the n preambles within a known inbound signal arrival time period.
In contrast, each signal acquisition unit of the conventional ground control center only receives the IP data packets of a single beam to be processed, and the acquisition of the preamble code needs to be completed after the IP data packets of all the single beams are processed.
104, distributing capture tasks of specific numbers of different lead codes to a single processing channel of the signal capture unit, presetting response outbound subframe numbers of the lead codes, and determining arrival time periods of the lead codes according to the response outbound subframe numbers; the specific number is the number of preambles that a single channel of the signal acquisition unit can handle at most.
The ground control center distributes a specific number n of acquisition tasks of different lead codes to each signal acquisition unit, the different lead codes are distinguished by different spreading codes, the spreading codes of the n lead codes are stored in the signal acquisition units, the lead codes processed by each signal acquisition unit are different, and the ground control center can adjust the number of the lead codes to be processed by each signal acquisition unit according to the actual situation,
106, searching lead code information appointed in the IP data packet according to a preset searching sequence, extracting sampling data sections from the searched IP data packet, and splicing the sampling data sections according to the sequence of receiving the IP data packet to obtain a sampling data stream; and performing correlation operation on the sampling data streams at different moments and different local spread spectrum codes, and calling the corresponding local spread spectrum codes by using a signal capturing unit in each lead code arrival time period to complete lead code signal capturing.
Each signal capturing unit is allocated with lead codes with different specific numbers, response outbound subframe numbers of the inbound of each lead code are preset, the ground control center predicts the arrival time period of each lead code signal according to the response outbound subframe numbers, and the signal capturing units search the designated lead codes in all inbound beams of all satellites in the determined time period without traversing all sampling points, so that the capturing complexity is greatly reduced, the computation load is reduced, and the receiving and processing capacity of the ground control center is improved.
In the method, the response outbound subframe number of each lead code inbound is preset, the ground control center predicts the arrival time period of each lead code signal according to the response outbound subframe number, and the signal capturing unit searches the appointed lead code in all inbound beams of all satellites in a determined time period without traversing all sampling points, so that the capturing complexity is greatly reduced, the computation amount is reduced, and the receiving processing capacity of the ground control center is improved. Meanwhile, in order to further improve the capturing speed, aiming at different lead codes, the signal capturing unit adopts channel sensing to adjust the processing sequence of each beam in real time, and the capturing complexity is reduced. The system can process more inbound signals for different preambles with the same computational resources.
In one embodiment, if an allocation manner that 1 preamble is allocated to 1 user is adopted, when the signal acquisition unit acquires an IP data packet of a next beam of the same satellite, the signal acquisition unit may acquire the preamble signal by using acquisition information acquired by a previous beam.
In an embodiment, if 1 preamble is allocated to 1 user, the preamble is obtained after the signal acquisition unit completes data processing on the IP packet of the y-th beam of the x-th satellitenInbound time T for individual subscriber x,y ={t i } x,y ={t 1 ,t 2 ,…NA,…t n } x,y Wherein NA denotes that no acquisition is in the beamPreamble of user i. Since the user signals are inbound via different beams of the same satellite, and the two-way transmission time delays are consistent, when the signal capturing unit captures the IP data packet of the next beam, namely the (y +1) th beam of the x-th satellite, the signal capturing unit can capture the IP data packet of the next beam at T x,y ={t i } x,y ={t 1 ,t 2 ,…NA,…t n } x,y The preamble of user i is searched near the time of day, thereby further compressing the search range. For user i, who did not acquire a preamble in the IP packet of the y-th beam of the x-th satellite, it is still necessary to do so at K i T subframe +2[t min , t max ]The search is performed within a time range.
In one embodiment, the specified number of calculation processes is
Wherein,T subframe is the duration of the outbound subframe;t min is the minimum transmission time delay of the space propagation required by the ground control center for transmitting the inquiry signal to the corresponding user equipment response signal,t max is the corresponding maximum bi-directional transmission delay.
In a particular embodiment, outbound subframes are assumedT subframe =0.05s, estimating the minimum two-way propagation delay from the user equipment to the ground control centert min . Taking the GEO satellite as an example, since the GEO satellite is located on the equatorial plane, the altitude h is 35800 km, and the earth radius r is 6371 km, the minimum and maximum propagation delays from the user equipment to the GEO satellite are respectively:
assuming a propagation delay between the ground control center and the GEO satellite of 0.125s, then the minimum two-way propagation delay =2 x (0.119+0.125) =0.488 s; maximum two-way propagation delay =2 x (0.139+0.125) =0.528 s.
From this it can be calculated
In one embodiment, the preset search order comprises a first search order and a second search order; the first search order is the processing order of the Vlan tag; the second search sequence is to search for IP packets corresponding to the inbound beam of the user equipment.
In one embodiment, if a plurality of users share 1 preamble, the signal acquisition unit searches for preamble information specified in the IP data packet by using a first search order;
if 1 user dedicates 1 lead code, the signal capturing unit searches lead code information appointed in the IP data packet by adopting a second searching sequence;
for the mobile user equipment, the processing sequence of the IP data packet is adjusted in real time according to the last inbound beam number and the inbound signal strength of the mobile user equipment, and the signal capturing unit preferentially processes the IP data packet corresponding to the stronger signal beam.
In a specific embodiment, the signal capturing unit adjusts the processing sequence of each beam in real time by adopting channel sensing, so as to reduce the capturing complexity. The system can process more inbound signals of different preambles on the same computational resource.
In a specific embodiment, if multiple users share 1 preamble, the signal acquisition unit may process in the order of Vlan # 1 to Vlan # N.
If 1 user is dedicated to 1 preamble, then for a fixed-location user equipment, because its inbound beam is also basically fixed, it is possible to search only the IP data packet corresponding to the inbound beam of the user equipment, and the IP data packets corresponding to other non-inbound beams may not be processed, thereby reducing the amount of computation.
For the mobile user equipment, the processing sequence of the IP data packet can be adjusted in real time according to the last inbound beam number of the mobile user and the inbound signal strength of the mobile user, the signal capturing unit preferentially processes the IP data packet corresponding to the stronger signal beam, and the signal capturing unit is ensured to rapidly capture the lead code with higher probability, so that the time for searching the IP data packets corresponding to other beams is further shortened. The signal capturing unit may search all the IP data packets of all the beams of the satellite, or may stop searching the remaining IP data packets after searching the preambles inbound from c beams by the user, and the specific value of c may be defined according to the actual situation, for example, if bidirectional positioning/time service needs to be performed on the mobile user, c may be greater than or equal to 3; if bidirectional positioning/time service is not needed for the mobile user, c can be 1-2.
In one embodiment, determining each preamble arrival time period based on the response outbound subframe number comprises:
presetting the response outbound sub-frame number of n different lead codes as K, wherein the time period of the user responding to the outbound sub-frame number is K i T subframe +[t min ,t max ]Obtaining the time period K of the ith lead code reaching the ground control center i T subframe +2[t min , t max ]。
In a specific embodiment, 1 preamble may be allocated to 1 user for exclusive use, or may be allocated bydThe user can share the same information with each other,ndifferent lead codes transmit the inbound signals according to the appointed response outbound sub-frame number K, and the principle is thatnThe preambles being evenly distributed over different responsive outbound subframe numbers, using the same preambledEach subscriber must transmit an inbound signal on a designated responsive outbound subframe number K. Then the d user inbound signals using the i-th preamble received by the terrestrial control center are at time K i T subframe +2[t min , t max ]Within the time range of (a), the signal acquisition unit only needs to complete K for the d users i T subframe +2[t min , t max ]Capturing a time period;
FIG. 3 shows a response outbound subframe number K provided by an embodiment of the present invention 0 Timing diagram of inbound signal stream if outbound framing durationT subframe ≥(t max -t min ) The inbound signal flow timing table, as shown in table 1, specifies that a user using preamble 1 can only transmit inbound signals in response to outbound subframe number 1, a user using preamble 2 can only transmit inbound signals in response to outbound subframe number 2, and so on. The time for receiving the inbound signal by the ground control center is = the time corresponding to the outbound sub-frame number +2t min ,t max ]And the signal acquisition unit calls the corresponding local spreading code within a specified time period to complete signal acquisition.
TABLE 1
If outbound sub-frame durationT subframe <(t max -t min ) The inbound signal flow timing schedule is shown in Table 2, where it is assumedT subframe =0.025s，t max -t min =0.04s, it is specified that the user using preamble 1 can only transmit the inbound signal in response to the outbound subframe number 1, the user using preamble 2 can only transmit the inbound signal in response to the outbound subframe number 3, and the user using preamble 3 can only transmit the inbound signal in response to the outbound subframe number 5. Then the time at which the inbound signal is received by the ground control center is = time +2 corresponding to the outbound sub-frame numbert min ,t max ]And the signal acquisition unit calls the corresponding local spreading code within a specified time period to complete signal acquisition.
FIG. 4 is a schematic diagram of the correlation operation for processing n preambles for the signal acquisition unit
TABLE 2
In one embodiment, preprocessing a single beam inbound signal to obtain a tag beam includes:
and performing down-conversion, filtering and sampling quantization on the single-beam inbound signal, converting the radio-frequency analog signal into a digital baseband signal, completing IP data packet framing according to a protocol, and printing a Vlan tag corresponding to the single beam to obtain a tag beam.
In one embodiment, when a user registers for network access, the user is allocated with a corresponding preamble, and after allocation, the user needs to transmit an inbound signal using the allocated preamble every time the user is inbound, as shown in fig. 5, an embodiment of the present invention provides a data frame format of an inbound signal.
The preamble allocation method includes 2 methods: the method comprises the following steps: different lead codes, namely one user and one code, are distributed to different users; the second method comprises the following steps: the number of preambles is limited, and multiple users share 1 preamble.
In one embodiment, assume the number of satellites is Q, the number of inbound beams per satellite is L, and the number of different preambles is N pre The number of sampling points in a single IP data packet is N sample Maximum two-way delay differencet max -t min Table 3 shows the complexity comparison between the capture method and the original capture method in the embodiment of the present invention. It can be seen that the complexity of the capture method provided by the embodiment of the present invention is 1/25 of the original capture method.
TABLE 3
It should be understood that, although the steps in the flowchart of fig. 1 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 1 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
In one embodiment, an intelligent cognitive joint acquisition system for a multi-beam time division access signal is provided, comprising: user equipment and ground control center, wherein: the ground control center consists of a transmitting link and a receiving link;
the method comprises the steps that an outbound signal is generated by a transmitting link of a ground control center, sent to a satellite and forwarded to a user through the satellite, the outbound signal is divided into a superframe and subframe structure in a time domain, 1 superframe is composed of a plurality of subframes, and the text of each subframe carries a corresponding outbound subframe number to indicate which subframe the subframe belongs to;
the receiving link of the ground control center is composed of a receiving antenna, a radio frequency sampling unit, an exchanger, a signal capturing unit and the like, each inbound wave beam is provided with an independent radio frequency receiving link, the radio frequency sampling unit preprocesses the single-wave beam inbound signals to obtain a tag wave beam, and the tag wave beam is sent to the exchanger; the switch forwards IP data packets of all beams of all satellites to each signal capturing unit according to the Vlan tag, a specific number of capturing tasks of different lead codes are distributed to a single processing channel of the signal capturing unit, a specific number of different lead codes are distributed to each signal capturing unit, the different lead codes reach a ground control center within respective specified time periods, and the signal capturing unit completes capturing the corresponding lead codes within known arrival time periods of the lead codes;
the user equipment receives the outbound signal and transmits the inbound signal at an outbound signal reference time scale corresponding to the specified outbound subframe number using the specified preamble.
In one embodiment, after receiving the IP packets of all satellites and all beams, each signal capturing unit of the ground control center may pre-specify the processing sequence of the IP packets, or may automatically adjust the processing sequence in real time according to the actual user inbound situation, and the signal capturing unit preferentially processes the inbound beams with better user signal carrier-to-noise ratio.
In the above intelligent cognitive combined capturing system for the multi-beam time division access signals, the inbound response outbound subframe number of each lead code is preset, the ground control center predicts the arrival time period of each lead code signal according to the outbound subframe number, and the signal capturing unit searches for the designated lead code in all inbound beams of all satellites in a determined time period without traversing all sampling points, so that the capturing complexity is greatly reduced, the computation load is reduced, and the receiving processing capacity of the ground control center is improved. Meanwhile, in order to further improve the capturing speed, aiming at different lead codes, the signal capturing unit adopts channel sensing to adjust the processing sequence of each beam in real time, and the capturing complexity is reduced. The system can process more inbound signals of different preambles on the same computational resource.
For specific limitations of the intelligent cognitive joint acquisition system for a multi-beam time division access signal, reference may be made to the above limitations of the intelligent cognitive joint acquisition method for a multi-beam time division access signal, and details are not repeated here. All or part of each module in the intelligent cognitive combined capturing system for the multi-beam time division access signals can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. An intelligent cognitive joint acquisition method for a multi-beam time division access signal, the method comprising:
acquiring a plurality of single beam inbound signals;
preprocessing the single-beam inbound signal to obtain a tag beam; the tag beam represents a beam containing a Vlan tag;
forwarding the IP data packets of all beams of all satellites to each signal capturing unit according to the Vlan tag of the tag beam;
allocating capturing tasks of specific numbers of different lead codes to a single processing channel of the signal capturing unit, presetting response outbound subframe numbers of the lead codes, and determining arrival time periods of the lead codes according to the response outbound subframe numbers; the specific number is the number of the lead codes which can be processed by a single channel of the signal acquisition unit at most;
searching lead code information appointed in the IP data packet according to a preset searching sequence, extracting sampling data sections from the searched IP data packet, and splicing the sampling data sections according to the sequence of receiving the IP data packet to obtain a sampling data stream;
and performing correlation operation on the sampling data streams at different moments and different local spread spectrum codes, and calling the corresponding local spread spectrum codes by using a signal capturing unit in each lead code arrival time period to complete lead code signal capturing.
2. The method of claim 1, further comprising:
if the allocation mode that 1 preamble is allocated to 1 user is adopted, the signal acquisition unit can acquire the preamble signal by using the acquisition information acquired by the previous beam when acquiring the IP data packet of the next beam of the same satellite.
3. The method of claim 1, wherein the certain number of calculation processes is
Wherein,T subframe is the duration of the outbound subframe;t min is the minimum transmission time delay of the space propagation required by the ground control center for transmitting the inquiry signal to the corresponding user equipment response signal,t max is the corresponding maximum bi-directional transmission delay.
4. The method according to claim 1, wherein the preset search order comprises a first search order and a second search order; the first search sequence is a Vlan tag processing sequence; the second search order is the order of the IP packets corresponding to the stronger signal beam.
5. The method of claim 4, further comprising:
if the multiple users share 1 lead code, the signal acquisition unit adopts a first search sequence to search the lead code information appointed in the IP data packet;
if 1 user dedicates 1 lead code, the signal capturing unit searches lead code information appointed in the IP data packet by adopting a second searching sequence;
for the mobile user equipment, the processing sequence of the IP data packet is adjusted in real time according to the last inbound beam number and the inbound signal strength of the mobile user equipment, and the signal capturing unit preferentially processes the IP data packet corresponding to the stronger signal beam.
6. The method of claim 3, wherein determining each preamble arrival time period based on the response outbound subframe number comprises:
presetting response outbound subframe numbers of n different lead codes as K i The time period of the user responding to the outbound subframe number is K i T subframe +[t min ,t max ]Obtaining the time period K of the ith lead code reaching the ground control center i T subframe +2[t min , t max ]。
7. The method of claim 1, wherein preprocessing the single beam inbound signal to obtain a tag beam comprises:
and performing down-conversion, filtering and sampling quantization on the single-beam inbound signal, converting a radio frequency analog signal into a digital baseband signal, completing IP data packet framing according to a protocol, and printing a Vlan tag corresponding to the single beam to obtain a tag beam.
8. An intelligent cognitive joint acquisition system for a multi-beam time division access signal, the system comprising: the system comprises user equipment and a ground control center, wherein the ground control center consists of a transmitting link and a receiving link;
the method comprises the steps that an outbound signal is generated by a transmitting link of the ground control center, sent to a satellite and forwarded to a user through the satellite, the outbound signal is divided into a superframe and subframe structure in a time domain, 1 superframe is composed of a plurality of subframes, and the text of each subframe carries a corresponding outbound subframe number to indicate which subframe the subframe belongs to;
the receiving link route of the ground control center comprises a receiving antenna, a radio frequency sampling unit, an exchanger and a signal capturing unit, each inbound wave beam is provided with an independent radio frequency receiving link, and the radio frequency sampling unit preprocesses a single-wave beam inbound signal to obtain a label wave beam and sends the label wave beam to the exchanger; the switch forwards IP data packets of all beams of all satellites to each signal capturing unit according to the Vlan tag, a specific number of capturing tasks of different lead codes are distributed to a single processing channel of the signal capturing unit, a specific number of different lead codes are distributed to each signal capturing unit, the different lead codes reach a ground control center within respective specified time periods, and the signal capturing unit completes capturing the corresponding lead codes within known arrival time periods of the lead codes;
and the user equipment receives the outbound signal and transmits the inbound signal at the outbound signal reference time mark corresponding to the specified outbound subframe number by using the specified preamble.
9. The system of claim 8, further comprising:
after each signal capturing unit of the ground control center receives the IP data packets of all satellites and all beams, the processing sequence of the IP data packets can be pre-designated, and can also be automatically adjusted in real time according to the actual user inbound condition, and the signal capturing unit preferentially processes the inbound beams with better user signal carrier-to-noise ratio.
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