CN106452645A - Satellite group network time synchronization method based on cross-layer design - Google Patents
Satellite group network time synchronization method based on cross-layer design Download PDFInfo
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- 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
- H04B7/18521—Systems of inter linked satellites, i.e. inter satellite service
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- H—ELECTRICITY
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- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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Abstract
The invention discloses a satellite group network time synchronization method based on a cross-layer design. A spread spectrum signal mechanism is employed in a physical layer. A clock difference between a son node and a father node is calculated in a semi-two-way inter-satellite distance measurement mode, thereby finishing high-precision time synchronization between the nodes. Network synchronization management is employed in an MAC layer, synchronization state information is broadcasted in a network and synchronization topology management is carried out. A time synchronization father node selection result is provided for the physical layer for inter-node synchronization, thereby finishing time synchronization among the nodes of the whole network. The method provided by the invention is applicable to inter-satellite time synchronization demands of various satellite groups; there is no special demand for a satellite system; the universality is high; the application range is wide; on-satellite processing is simple; and the method has good application prospect.
Description
Technical field
The invention belongs to satellite communication field, it is related to a kind of satellite network method for synchronizing time, is capable of complex space
Satellite Networking time synchronized under environment is it is adaptable to time synchronized application between the star of an all kinds of group of stars.
Background technology
The network interconnection between star can lift the service ability of network to greatest extent, the service area of extended network, effectively
Make up the various deficiencies that single star exists in orbit, thus building, One function is perfect, stable performance Simulation spatial service system.
A formation group of stars compared to for conventional constellation it is desirable to participate in formation flight each satellite platform between mutual
Position measurement is more accurate, and Formation Configuration is more stable, simultaneously because information will be occurred between each satellite platform to exchange, therefore
The clock between each satellite platform is required strictly to unify, the capacity of will of single satellite platform is higher.Simultaneously as satellite is compiled
The needs of team's integration transmission, need between satellite node to obtain relative distance information by precision ranging, and determine based on this
Determine in through-put power and frame structure, to protect the length of section.Therefore obtain high-precision Time and Frequency Synchronization result to adaptation space-time large span
Aerospace Satellite networking significant.
In theory, the frequency only simultaneously realizing two clocks is consistent with the clock face moment, could be referred to as time synchronized.But by
There is certain unstability in the frequency source in frequency-adjustable, therefore in real work, the time difference of two clocks can not possibly remain one
Individual constant it is allowed to there is certain error in the frequency marking of two clocks, as long as constantly adjustment two clocks clock face difference so that clock face difference exhausted
Value is maintained at one can tolerate in the range of it is possible to think that two clocks have reached the time synchronized of certain precision.
In the wireless self-organization network using TDMA system, each child node is generally divided into out with the synchronizing process of host node
Ring synchronization and two steps of closed-loop synchronization.The broadcast synchronization beacon of host node cycle, after each child node detects sync beacon
Just restart timing immediately, here it is open loop is synchronous.Due to the impact of propagation delay, when in net, the timing of each child node initiates
This is different.If each child node only receives the broadcast of host node and does not send during data it is clear that open loop to host node
Synchronization is enough.For the propagation delay of link, calibrated by the way of closed-loop synchronization：Synchronization node is in fixing time slot
Interior periodically send ECHO (echo, the one kind for surveying time delay use comes and goes measurement frame) packet to datum node, and lead to
Cross local clock counter to start counting up, datum node will return this packet after receiving ECHO packet immediately, synchronous section
When point receives the ECHO of reply, clock counter stops counting, and is just estimated that synchronization node and benchmark according to this count value
The chain-circuit time delay of node, such node just can refresh link propagation time delay in real time, revises open loop synchronous.In view of not each
Child node and host node are all visible, and therefore each child node selects the higher node of clock stratum first as synchronization
Benchmark, each node can send synchronous code in the synchronization slot that it is located, to local clock meter after node receives this code
Number device is calibrated, thus expanding the area coverage of reference clock.
Networking transmission plan between using the star of TDMA system, in cluster, each inter-satellite is carried out accurately by master-slave synchronisation mode
Time synchronized, traditional method of synchronization is interacted by the frame of MAC layer, completes open loop synchronization and the closed-loop synchronization between main and subordinate node.
Ring soon in star cluster Satellite Networking project, typical interstellar distance is 10～1300km, transfer rate is 128kbps～1kbps, passes through
The frame interaction of MAC layer carries out time synchronization between nodes, and under so low transfer rate, synchronization accuracy can become very poor, about
10us-1000us, this much cannot meet the demand of TDMA exact time synchronization.
Content of the invention
Present invention solves the technical problem that being：Overcome the deficiencies in the prior art, there is provided a kind of star based on cross layer design
Group network method for synchronizing time, enters the synchronous Topology Management between planet cluster node in MAC layer, in physical layer using the signal spreading
System, by half-duplex Time transfer receiver distance measuring method calculate node between clock correction, realize the synchronization between node.In different transmission speed
Under rate, the spread-spectrum code rate of physical layer keeps constant, will not bring the evil of timing tracking accuracy because of the reduction of transfer rate
Change.Combined by the synchronous Topology Management of MAC layer and physical layer are spread range finding, the synchronization of achievable the whole network time, for adopting
Provide stable, synchronization scenario between high-precision star with the group of stars network of TDMA system.
The technical solution of the present invention is：A kind of group of stars method for synchronizing network time based on cross layer design, including：
(1) starting time synchronizing function after each satellite node start；
(2) the in-orbit Network Synchronization status information intercepting other satellite node broadcast of each satellite node, if satellite node exists
Do not listen to the Network Synchronization status information of other satellite node broadcast in the time of preseting length, then the role controlling oneself is determined
For time reference node；If satellite node have collected the Network Synchronization state of surroundings nodes broadcast within the time of preseting length
Information, then be chosen to be father's section of this satellite time synchronization according to the Synchronization Status Message collected by clock stratum highest node
Point, determines oneself to be child node simultaneously；
(3) for time reference node, receive, in MAC layer, the synchronization request that new network access node reports, and ring in physical layer
The time synchronization process of the child node that should newly network；Distribute synchronization slot and time slot to child node, and the synchronization in each node
The synchronization request of time slot responses child node, completes the synchronization of the whole network time, and synchronizes management to each child node；
(4) for non-temporal datum node, in MAC layer, the father node selected is issued to physical layer, and sends out in physical layer
Play the time synchronization process with father node；After the completion of time synchronization process, child node to datum node application synchronization slot with wide
Sowing time gap, and interact with father node in synchronization slot, complete to maintain with the synchronization of father node, realize the same of the whole network time
Step；
(5) after the completion of the time synchronization process of each satellite node, the broadcasting satellite node Synchronization Status Message of itself, carry out
The diffusion of lock in time, and each child node is synchronized management and each father node synchronize maintenance.
Described Network Synchronization status information includes node ID, datum node ID, clock stratum, synchronization slot occupancy shape
State, wherein node ID refer to the identifier of this star itself, and datum node ID refers to the identifier of the whole network time reference place satellite, clock
Rank refers to this star location in Time Transmission, and datum node clock stratum is 0 grade, the satellite section being connected with his jump
The clock stratum of point is 1, the like, more remote with datum node, clock stratum is lower, and synchronization slot seizure condition refers to entirely
In super frame period, which synchronization slot is occupied, and which is unoccupied.
Described time synchronization process, including：
The first step：Child node is by t during local clock faceson_sendAfter inserting synchronization frame, send synchronization frame, father node to father node
Sent using the child node that receives forward position clock face when tson_sendWith the time t receiving synchronization frame forward positionfather_arriveMeter
Calculate local pseudorange tα：
tα=tfather_arrive-tson_send；
Second step：Father node is by t during local clock facefather_sendWith local pseudorange tαIt is filled up to feedback frame and send back sub- section
Point, t when child node sends the clock face in forward position using the father node receivingfather_sendWith the time receiving synchronization frame forward position
tson_arriveCalculate local pseudorange tβ：
tβ=tson_arrive-tfather_send；
3rd step：Child node is according to the local pseudorange t recordingβAnd receive the local pseudorange t of father nodeαIt is calculated two
Clock correction Δ t between node：
Δ t=(tα-tβ)/2；
4th step：The time of child node adds Δ t, completes the time synchronized of child node and father node.
Described child node synchronizes management, including：
The first step：Wait the time slot of child node, detect whether to receive the broadcast frame of child node；If receiving child node
Broadcast frame then continue；If not receiving the broadcast frame of child node, enumerator adds 1 entrance second step；
Second step：Judge the value of enumerator, if enumerator is less than or equal to maximum logout thresholding MAX_exit, continue
Treat that the time slot of child node detects the broadcast frame of child node；If enumerator is more than MAX_exit, this vertex ticks is to move back
Net node；
3rd step：Send No. ID of logout child node to father node in traffic frame.
Described father node synchronizes maintenance, including：
The first step：Wait the time slot of father node, detect whether to receive the broadcast frame of father node；If receiving father node
Broadcast frame by counter O reset and continue；If not receiving the broadcast frame of father node, enumerator adds 1 entrance second step；
Second step：Judge the value of enumerator, if enumerator is less than or equal to maximum asynchronous thresholding MAX_asyn, continue
Wait the broadcast frame of the time slot detection child node of child node；If enumerator is more than MAX_asyn, this node is labeled as
Asynchronous node, and restart networking synchronizing process.
Present invention advantage compared with prior art is：
(1), in the inventive method, using based on semiduplex spread spectrum time of measuring synchronization system between node, can try one's best less
Interactive bout under, very high synchronization accuracy is provided, saves the rare communication resource on star.
(2) the inventive method passes through cross layer design, synchronizes Topology Management by MAC layer, is easy to use processor on star
Run the high management algorithm of complexity to optimize Topology Management performance；
(3) the inventive method is found range using the modulation system of spread spectrum in physical layer, is provided higher based on hardware circuit
Certainty of measurement, it is to avoid the impact to certainty of measurement for the change of space propagation speed, be finally completed the whole network time synchronized；
(4) the inventive method is the exclusive synchronization slot of each node distribution, is initiated by child node, carries out half pair to father node
To spread spectrum measurement, in the way of time division multiple acess, provide independent time synchronized channel for nodes multiple in network, it is to avoid synchronous letter
Number conflict, effectively solving multinode stationary problem.
Brief description
Fig. 1 is the FB(flow block) of the inventive method；
Fig. 2 is the frame structure schematic diagram of the present invention；
Fig. 3 is broadcast frame structural representation of the present invention；
Fig. 4 is synchronous frame stucture schematic diagram of the present invention；
Fig. 5 is feedback frame structural representation of the present invention；
Fig. 6 is node initializing of the present invention and infonnation collection process schematic diagram；
Fig. 7 is time reference node selection process schematic of the present invention；
Fig. 8 is node synchronization of the present invention and time slot acquisition process schematic diagram；
Fig. 9 is the time synchronization process schematic diagram of range finder module of the present invention；
Figure 10 is the process chart of time reference node of the present invention；
Figure 11 is the process chart of non-temporal datum node (networking) of the present invention；
Figure 12 is child node management by synchronization flow chart of the present invention；
Figure 13 is that father node of the present invention synchronously maintains flow chart.
Specific embodiment
As shown in figure 1, being the handling process of cross-layer group of stars method for synchronizing network time of the present invention, specifically include following step
Suddenly：
(1) starting time synchronizing function after each satellite node start；
(2) the in-orbit Network Synchronization status information intercepting other satellite node broadcast, Network Synchronization status information includes：Section
Point ID, datum node ID, clock stratum, synchronization slot seizure condition etc.；
Wherein, node ID refers to the identifier of this star itself, and datum node ID refers to the identification of the whole network time reference place satellite
Number, clock stratum refers to this star location in Time Transmission, and that is, datum node clock stratum is 0 grade, with his company of jump
The clock stratum of the satellite node connecing is 1, the like, more remote with datum node, its clock stratum is lower, and synchronization slot takies
State refers in whole super frame period, which synchronization slot is occupied, and which is unoccupied.
(3) if satellite node does not listen to the Network Synchronization state letter of other satellite node broadcast within the fully long time
Breath, then be defined as time reference node by the role controlling oneself；If satellite node saves around have collected within the fully long time
Put the Network Synchronization status information of broadcast, then clock stratum highest node is chosen to be by the Synchronization Status Message according to each node
The father node of this star time synchronized, determines oneself to be child node；
(4) for non-temporal datum node：The father node selected is issued to by the time synchronized Topology Management module of MAC layer
Physical layer；For time reference node：Time synchronized Topology Management module receives the synchronization request that new network access node reports；
(5) for non-temporal datum node：Physical layer initiates the time synchronization process with father node；For time reference section
Point：Respond the time synchronization process of child node by physical layer；
(6) for non-temporal datum node：To datum node application synchronization slot and time slot；For time reference section
Point：Distribute synchronization slot and time slot to child node；
(7) for non-temporal datum node：The like, each satellite node as stated above, respectively in respective synchronization
Time slot is interacted with respective father node, completes to maintain flow process with the synchronization of father node, the high accuracy realizing the whole network time is same
Step.After the completion of the time synchronization process of satellite node, the broadcasting satellite node Synchronization Status Message of itself, for lock in time
Diffusion, and management is synchronized to each child node.For time reference node：The like, reference satellite node presses above-mentioned side
Method, respectively in the synchronization request of the synchronization slot response child node of each node, completes the high-precise synchronization of the whole network time, and to each
Child node synchronizes management.
Below key link therein is described in detail.
Set up a tdma system, first have to carry out the design of system frame format, in system, all of time slot distributes all
It is that in units of the time, super frame tim e is the longest based on this system frame format, divided M multi-frame under superframe (for ensureing
Each node has exclusive synchronization slot, so the value of M should be greater than the total satellite node number in satellites formation), each
Multi-frame be made up of a synchronization slot and N number of traffic frame (for so that each node has abundant traffic frame resource to use, N's
Value should be much larger than satellite node number, and e.g., when nodes are 8, the value of N can be 256 or 512).
Designed system frame format of the present invention is as shown in Fig. 2 contain M multi-frame in one superframe of system；One multi-frame bag
Containing a synchronization slot and N number of traffic frame；Synchronization slot is used for half-duplex spread spectrum range finding；Business frame in arranges broadcast frame, is used for
The broadcast of the Synchronization Status Message of each node.
It is related to three kinds of frame structures altogether in the present invention
A) broadcast frame structure
Broadcast frame is used for the information such as sending node clock grade, datum node, for the selection to father node for the child node；Son
Node can send unallocated time slot in broadcast frame and ask timeslot number to datum node, and broadcast frame structure is as shown in Figure 3.
Broadcast address：Mark broadcast frame (5 bit)
Send address：Sending node ID (5 bit)
Clock grade：Send the clock grade (3 bit) of broadcast frame node
Datum node：Represent synchronization master ID (5 bit)
Multi-frame counts：The multi-frame sending the node of broadcast counts (5 bit)
CRC：Check bit.
B) synchronous frame stucture
Synchronization frame is used for child node and initiates synchronous flow process, and its structure is as shown in Figure 4.
Destination address：The ID of receiving node, fills in the receiving node ID of this synchronization frame；
Send address：The ID of sending node；That fills in this synchronization frame sends node ID；
P/F：Synchronization frame and feedback frame distinguishing identifier, this position of synchronization frame is 0；
During local clock face：Local synchronization frame forward position sends the moment, reaches synchronization frame epoch for calculating；
CRC：Check bit.
C) feed back frame structure
Feedback frame is used for the synchronization request of father node response child node, and feedback time information, and its structure is as shown in Figure 5.
Destination address：The ID of receiving node, fills in the receiving node ID of this feedback frame；
Send address：The ID of sending node, that fills in this feedback frame sends node ID；
P/F：Synchronization frame and feedback frame distinguishing identifier, this position of feedback frame is 1；
During local clock face：Local feedback frame forward position sends the moment, reaches feedback frame epoch for calculating；
Local pseudorange value：By local spread spectrum acquisition, when the synchronization frame that acquisition other nodes send reaches epoch, calculate it
The corresponding local pseudorange of its node, and binding and layout are to corresponding node transmission；
CRC：Check bit.
1) node initializing and infonnation collection process
The initialization of node and infonnation collection process as shown in fig. 6, be set to asynchronous by synchronous regime after node start
State, intercepts the synchronized broadcast frame that surroundings nodes send, can intercept several super frame period, according to whether receive broadcast frame judging
Whether surrounding has synchronizing network.If there are synchronizing network, then the parent information of selection is sent to range finder module, by range finding mould
Block completes the time synchronization process and between father node；If surrounding does not have synchronizing network, enter clock reference node selection rank
Section.
After satellite group enters working track, in a group of stars, each node need not be started shooting in particular order, can freely arrange out
The machine time；After node start, its synchronous regime is set to asynchronous regime, and starting time synchronizing function.
2) time reference node selection process
Time reference node selection process is as shown in fig. 7, mainly include following step：
The first step：Random back T super frame period (is intended to first intercept the sufficiently long time, is deposited with guaranteeing to hear
Network, in addition, the T value of each node be random determine, different it is ensured that always there being certain node can detect FEFO
Listen, begin setting up benchmark), and intercept channel and have or not broadcast frame.If there being broadcast frame, choose father node, and the father node that will obtain
ID is sent to range finder module, subsequently completes synchronization slot acquisition process；If not receiving broadcast frame, enter second step process.
Second step：Broadcast frame, the synchronization slot of setting range finder module are sent on the 1st business time-slot of the 1st multi-frame
For the initial length carrying previous synchronization slot of the 1st multi-frame, and this node identification is time reference node (each node
T super frame period will be intercepted, the T of each node is the random value that itself produces, and is not mutually equal, therefore always has individual T
Little node can first be intercepted and be finished, and will control oneself and be set to benchmark, and after having on the basis of a node confirmation, other nodes will be same
Walk on this benchmark).Then start that intervalometer (timer length is set to 1 super frame period) intercepts that range finder module reports please
Seek network access node No. ID, if after receiving requesting node ID, is this node distribution time slot and range finder module synchronization slot
(allocation result information will be sent with mode of unicast in business time-slot).
3) node synchronization and time slot acquisition process
Node is synchronous and time slot to obtain be to send, to father node, the application that networks, by datum node distribution synchronization slot and
Time slot, completes entirely to enter network process.Detailed process is as shown in figure 8, be made up of the following steps：
The first step：Receiving this node identification after the broadcast frame of father node is child node, father node ID that will be synchronous
It is sent to range finder module as parameter and time synchronized intervalometer is set, if range finder module does not return synchronization in timer time
State then re-starts the first step；If range finder module returns synchronous regime, enter second step.
Second step：After getting the synchronous regime of range finder module, wait the time slot allocation result frame that father node sends, record
Datum node distributes to time slot and the synchronization slot of this node, and synchronization slot is sent to range finder module as parameter
4) time synchronization process of range finder module
The father node selected is issued to physical layer by the time synchronized Topology Management module of MAC layer, and physical layer initiates half pair
To spread spectrum range finding flow process as shown in Figure 9：
The first step：Master-slave synchronisation flow process between node is carried out in the synchronization frame of 76ms, when child node is by local clock face
tson_sendAfter inserting synchronization frame, superior clock node sends synchronization frame, and host node sends forward position using the child node receiving
Clock face when tson_sendWith the time t receiving synchronization frame forward positionfather_arriveCalculate local pseudorange tα：
tα=tfather_arrive-tson_send
Second step：Father node is by t during local clock facefather_sendWith local pseudorange tαIt is filled up to feedback frame and send back sub- section
Point.T when child node sends the clock face in forward position using the father node receivingfather_sendWith the time receiving synchronization frame forward position
tson_arriveCalculate local pseudorange tβ：
tβ=tson_arrive-tfather_send
3rd step：Child node is according to the local pseudorange t recordingβAnd receive the local pseudorange t of host nodeαCan be calculated
Clock correction Δ t between two nodes：
Δ t=(tα-tβ)/2
4th step：And accordingly clock is adjusted, when the time of child node adds that Δ t can achieve child node and higher level
The time synchronized of clock father node.
5) handling process of time reference node
Time reference node mainly completes the distribution of time slot and synchronization slot, and remains same with the hop node time
Step function, its handling process as shown in Figure 10, mainly includes following step：
The first step：Determine whether the multi-frame head that this node is located, if it is, by range finder module in even number synchronization slot
Respond the synchronizing process of new network access node, and No. ID of new network access node is reported CPU.CPU sends broadcast in time slot
Frame.If non-node place multi-frame, enter second step.
Second step：The synchronization of the synchronization slot response child node in child node for the range finder module of time reference node maintained
Journey.
3rd step：Receive the time slot recovery information that each child node reports, CPU is new network access node distribution time slot and records.
4th step：CPU sends new time slot allocation result in traffic frame.
6) handling process of non-temporal datum node (networking)
The request of non-temporal datum node time slot and synchronization slot and allocation flow are as shown in figure 11, including following several
Individual step：
The first step：Determine whether the multi-frame head that this node is located, if it is, range finder module is in the synchronization slot of odd-numbered frame
Complete the time synchronized and between father node；Complete the time synchronized with new network access node in the synchronization slot of even frame, and will enter
No. ID of net node reports CPU.Send broadcast frame in time slot.If non-node place multi-frame, enter second step.
Second step：Range finder module completes the time synchronized maintenance process with child node in synchronization slot, and CPU receives other sections
The broadcast frame of point.
3rd step：Receive the time slot recovery information that child node reports, and report time slot to reclaim information to father node.
4th step：CPU issues new time slot allocation result in business time-slot.
7) child node management by synchronization flow process
The management by synchronization flow process of child node as shown in figure 12, comprises following process：
The first step：Wait the time slot of child node, detect whether to receive the broadcast frame of child node；If receiving child node
Broadcast frame then continue；If not receiving the broadcast frame of child node, enumerator adds 1 entrance second step.
Second step：Judge the value of enumerator, if enumerator is less than or equal to maximum logout thresholding MAX_exit, continue
Treat that the time slot of child node detects the broadcast frame of child node；If enumerator is more than MAX_exit, this vertex ticks is to move back
Net node.
3rd step：Send No. ID of logout child node to father node in traffic frame
8) father node synchronously maintains flow process
The synchronization of father node maintains flow process as shown in figure 13, mainly comprises following step：
The first step：Wait the time slot of father node, detect whether to receive the broadcast frame of father node；If receiving father node
Broadcast frame by counter O reset and continue；If not receiving the broadcast frame of father node, enumerator adds 1 entrance second step.
Second step：Judge the value of enumerator, if enumerator is less than or equal to maximum asynchronous thresholding MAX_asyn, continue
Wait the broadcast frame of the time slot detection child node of child node；If enumerator is more than MAX_asyn, this node is labeled as
Asynchronous node, and restart networking synchronizing process.
The content not being described in detail in description of the invention belongs to the known technology of those skilled in the art.
Claims (5)
1. a kind of group of stars method for synchronizing network time based on cross layer design is it is characterised in that include：
(1) starting time synchronizing function after each satellite node start；
(2) the in-orbit Network Synchronization status information intercepting other satellite node broadcast of each satellite node, if satellite node is setting
The Network Synchronization status information of other satellite node broadcast is not listened to, then when the role controlling oneself being defined as in the time of length
Between datum node；If satellite node have collected the Network Synchronization state letter of surroundings nodes broadcast within the time of preseting length
Breath, then be chosen to be the father node of this satellite time synchronization according to the Synchronization Status Message collected by clock stratum highest node,
Determine oneself to be child node simultaneously；
(3) for time reference node, receive, in MAC layer, the synchronization request that new network access node reports, and new in physical layer response
The time synchronization process of networking child node；Distribute synchronization slot and time slot to child node, and the synchronization slot in each node
The synchronization request of response child node, completes the synchronization of the whole network time, and synchronizes management to each child node；
(4) for non-temporal datum node, MAC layer by select father node be issued to physical layer, and physical layer initiate with
The time synchronization process of father node；After the completion of time synchronization process, when child node is to datum node application synchronization slot and broadcast
Gap, and interact with father node in synchronization slot, complete to maintain with the synchronization of father node, realize the synchronization of the whole network time；
(5) after the completion of the time synchronization process of each satellite node, the broadcasting satellite node Synchronization Status Message of itself, synchronize
The diffusion of time, and each child node is synchronized management and each father node synchronize maintenance.
2. a kind of group of stars method for synchronizing network time based on cross layer design according to claim 1 it is characterised in that：Institute
The Network Synchronization status information stated includes node ID, datum node ID, clock stratum, synchronization slot seizure condition, its interior joint
ID refers to the identifier of this star itself, and datum node ID refers to the identifier of the whole network time reference place satellite, and clock stratum refers to this
Star location in Time Transmission, datum node clock stratum is 0 grade, the clock level of the satellite node being connected with his jump
Not Wei 1, the like, more remote with datum node, clock stratum is lower, and synchronization slot seizure condition refers in whole super frame period
Which synchronization slot is occupied, and which is unoccupied.
3. a kind of group of stars method for synchronizing network time based on cross layer design according to claim 1 and 2, its feature exists
In：Described time synchronization process, including：
The first step：Child node is by t during local clock faceson_sendAfter inserting synchronization frame, send synchronization frame to father node, father node utilizes
The t when child node receiving sends the clock face in forward positionson_sendWith the time t receiving synchronization frame forward positionfather_arriveCalculate this
Ground pseudorange tα：
tα=tfather_arrive-tson_send；
Second step：Father node is by t during local clock facefather_sendWith local pseudorange tαIt is filled up to feedback frame and send back child node, son
T when node sends the clock face in forward position using the father node receivingfather_sendWith the time receiving synchronization frame forward position
tson_arriveCalculate local pseudorange tβ：
tβ=tson_arrive-tfather_send；
3rd step：Child node is according to the local pseudorange t recordingβAnd receive the local pseudorange t of father nodeαIt is calculated two nodes
Between clock correction Δ t：
Δ t=(tα-tβ)/2；
4th step：The time of child node adds Δ t, completes the time synchronized of child node and father node.
4. a kind of group of stars method for synchronizing network time based on cross layer design according to claim 1 and 2, its feature exists
In：Described child node synchronizes management, including：
The first step：Wait the time slot of child node, detect whether to receive the broadcast frame of child node；If receiving the wide of child node
Broadcast frame then to continue；If not receiving the broadcast frame of child node, enumerator adds 1 entrance second step；
Second step：Judge the value of enumerator, if enumerator is less than or equal to maximum logout thresholding MAX_exit, continue waiting for son
The time slot of node detects the broadcast frame of child node；If enumerator is more than MAX_exit, this vertex ticks is logout section
Point；
3rd step：Send No. ID of logout child node to father node in traffic frame.
5. a kind of group of stars method for synchronizing network time based on cross layer design according to claim 1 and 2, its feature exists
In：Described father node synchronizes maintenance, including：
The first step：Wait the time slot of father node, detect whether to receive the broadcast frame of father node；If receiving the wide of father node
Broadcast frame by counter O reset and to continue；If not receiving the broadcast frame of father node, enumerator adds 1 entrance second step；
Second step：Judge the value of enumerator, if enumerator is less than or equal to maximum asynchronous thresholding MAX_asyn, continue waiting for
The time slot of child node detects the broadcast frame of child node；If enumerator is more than MAX_asyn, this node is labeled as non-same
Step node, and restart networking synchronizing process.
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