CN108183758A - A kind of low orbit satellite short data communication channel agility distribution method - Google Patents
A kind of low orbit satellite short data communication channel agility distribution method Download PDFInfo
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- CN108183758A CN108183758A CN201711412113.2A CN201711412113A CN108183758A CN 108183758 A CN108183758 A CN 108183758A CN 201711412113 A CN201711412113 A CN 201711412113A CN 108183758 A CN108183758 A CN 108183758A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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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
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- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
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Abstract
The present invention proposes a kind of low orbit satellite short data communication channel agility distribution method, devise the clear channel assessment (CCA) strategy adjudicated based on sampled power, the priori measurement data of target frequency bands and ground network frequency allocation situation are fully considered simultaneously, alternative channel idle degree is ranked up, the distribution of channel agility and switching are carried out towards low orbit satellite.Compared with traditional channel fixed allocation and cut-in method, the present invention improves the spectrum application efficiency of satellite short data communication, effectively system itself is avoided to be interfered and the interference to other systems, solve frequency resource scarcity problem, it can effectively realize that the multisystem under limited spectrum resources is compatible with using the present invention, the anti-interference of satellite communication system and the effective utilization of frequency are improved, has the characteristics that flow is simple, flexibility is high, feasibility is strong.
Description
Technical field
The invention belongs to satellite communication fields, are related to a kind of satellite constellation short data communication channel and perceive distribution method.
Background technology
Satellite communication has many advantages, such as wide coverage, cost of building a station and communications cost are with being to realize the whole world apart from unrelated
The essential means of mobile communication are particularly suitable for the mobile communication demand for being difficult to be laid with wire communication facility area.In satellite
In the communications field, the satellite short data communication system that is made of Low earth orbit satellite constellation, the communication terminal and ground disperseed with wide area
The information that face sensor obtains is data source, and big region terminal communication and information Perception are realized using small satellite constellation, for
Family provides the services such as mobile voice communication, short data acquisition, short message communication, information broadcast, compared to general satellite communication system,
Have many advantages, such as that terminal is small, at low cost and overlay area is wide.As effective supplement of terrestrial communication networks, low orbit satellite short data
It communicates and the wide-area communication means of global tight covering is provided for fields such as Internet of Things.
Satellite frequency track resources are a kind of important rare strategic resources.Since satellite orbit is in the neck of any country
Except empty range, so and the international resource that shares of the whole mankind.In order to ensure the frequency between various radio service systems
It is compatible, International Telecommunication Association《Radio regulation(s)》Clear stipulaties have been carried out to type of business and the frequency that can be used.
Even if International Telecommunication Association《Radio regulation(s)》To give division to frequency resource, the frequency partition of various countries' reality and
Service condition is also not quite similar, and is divided into main business and secondary service.Domestic table of frequency allocations is not yet complete with the world
Unified, certain mobile satellite services divide at home for secondary service, therefore satellite communication system is wanted when using the frequency range
Worry system of resitting an exam will not interfere other systems, while ensure that itself is interference-free.Satellite short data communication system is main
It is related to mobile satellite service, terminal has the characteristics that miniaturization, mobility, considers its business demand and application scenarios, make
It is optimal selection with the frequency range of below 3GHz.Although the frequency range International Telecommunication Association for below 3GHz divides to mobile satellite service
Many frequency ranges, but really can be used for the extremely limited of support actual items application from coordination and actual techniques feasibility,
And almost carved up totally by existing system, therefore satellite system is gone back other than avoiding the interference between terrestrial communication networks
It is considered as the synthetic operation problem of different low rail systems.
In summary, demand of the satellite short data communication system in terms of satellite travel frequency, is faced with very severe
Problem.Frequency range is generally divided into Channel Terrestrial terminal and satellite by traditional satellite communication by the way of fixed allocation
Communication payload " terminal->Satellite " uplink is communicated using fixed frequency range, can not solve to prevent to main business and its
The problem of his same type system interferes, while itself lacks anti-interference mechanism, it is difficult to realize the Radio Frequency Compatibility between system,
And frequency spectrum resource utilization rate is limited.Compared to fixed allocation, in ground based cellular communication and a small number of satellite communication systems, although drawing
Enter concepts and the technologies such as Interference Detection, clear channel assessment (CCA) and dynamics of channels distribution, but still be confined to channel " distribution "
This link, lasting use distributes channel until sign off, the shortage fact update or happen suddenly change after communication is established
Agility.
China there is no the low rail constellation system for mobile communication and data collection service at present, frequency spectrum resource it is dilute
Lack, channel assignment strategy it is single, be restrict China's LEO satellite communication systems development an important factor for.
Invention content
The present invention provides a kind of low orbit satellite short data communication channel agility distribution method for the deficiency of background technology, fills
Point consider the laws of use of target frequency bands and priori measurement data, the service condition of comprehensive master goal narrowband slice and to letter
The active degree in road is ranked up, and is carried out the distribution of channel agility towards satellite constellation according to sensing results and can flexibly be changed switching
Channel can effectively realize that the multisystem under limited spectrum resources is compatible with using the present invention, improve the anti-of satellite communication system
The effective utilization of interference and frequency has the characteristics that flow is simple, flexibility is high, feasibility is strong.
The present invention provides a kind of low orbit satellite short data communication channel agility distribution method, mainly includes：
A kind of satellite short data communication channel agility distribution method, specifically includes following steps：
Step 1, the spaceborne spectrum analyzer of the passing of satelline is with Fixed Time Interval, fixed bandwidth step-scan uplink target frequency
Section；
Step 2, satellite receiver obtains power samples by scanning target frequency bands, and power samples decision method is taken to carry out
Threshold judgement forms resource pool by marker for determination for idle available channel virtual set；
Step 3, it is taken based on that grid is preferential and two kinds of judgment methods of qualitative factor to the channel idle situation in resource pool,
Successively the idle condition of alternative channel is ranked up according to the weight of each method；
Step 4, free channel information is broadcast to ground based terminal, terminal uses distribution signal channel launched；
Step 5, channel is switched using change mechanism to the occupancy of channel.
As a kind of further preferred scheme of satellite short data communication channel agility distribution method of the present invention, in step 1
In, spectrum scan specifically includes following steps：
Step 1.1, satellite carries out a spectrum scan every time τ, by spaceborne spectrum analyzer, with fixation bandwidth
Step-scan uplink target frequency bands, wherein and, and unit for kHz grade, and value is not more than the frequency of a short Burst Channel
Width, the unit of τ is second grade, and value range is in 1s-10s；
Step 1.2, scanning frequency spectrum stepping is less than or equal to minimum channel bandwidth；
Step 1.3, for short burst data communication, time interval is more than the time of signal of transmitting.
The further preferred scheme of satellite short data communication channel agility distribution method as the present invention, in step 2,
Threshold judgement specifically comprises the following steps：
Step 2.1, satellite receiver obtains power samples by scanning target frequency bands, when satellite reception in certain stepping bandwidth
The power samples of signal are fallen in a specified threshold hereinafter, being then put into the frequency range labeled as potential available channel frequency range
In case being used in next transmission time slot in resource pool；
Step 2.2, power samples threshold value is the actual measured value based on spatial frequency spectrum environment, is considered, terminal-defend
Star communication link design parameter, spaceborne receiver sensitivity design system index and parameter are calculated, final to determine CCA
Limit since the threshold value is by being being calculated by strict regulations and science, has most in channel selection criteria
High weight.
The further preferred scheme of satellite short data communication channel agility distribution method as the present invention, in step 3,
The sequence of channel idle situation is specific as follows in resource pool：
Step 3.1, resource pool is by the virtual set that marker for determination is idle available channel, to terminal distribution channel
And new available channel is selected from resource pool during channel change；
Step 3.2, the alternative channel in resource pool, first by being determined based on power samples decision method, then by being based on
Grid preferentially and two kinds of judgment methods of qualitative factor, is arranged the idle condition of alternative channel according to the weight of each method priority
Sequence.
The further preferred scheme of satellite short data communication channel agility distribution method as the present invention, in step 4,
Channel assignment step is specific as follows：
Step 4.1, in channel resource pool according to idle condition, frequency allocation in the top is selected to ground based terminal
Signal transmitting is carried out, other remaining channels continue to stay in reservation pond；
Step 4.2, channel distribution instruction is sent to ground based terminal by the form of satellite broadcasting.
The further preferred scheme of satellite short data communication channel agility distribution method as the present invention, in steps of 5,
Channel change mechanism is specific as follows：
All channels are not a allocated permanent occupancy, following three kinds of situations occur by alternate channel frequency point, are providing
Optimal channel assignment is selected in the channel to be selected of source pond：
(1) in communication process, satellite received signal is of poor quality to a certain extent, breaches the index door of spaceborne receiver
It limits or performance requirement is not achieved；
(2) when using new round frequency-scan data, channel selection procedure exceeds in currently distribution channel power level
Quality factor thresholding；
(3) channel duration of the same frequency range of terminal signaling transmitting occupancy reaches T, and 5 to 10 times that value is generally,
The channel of receiver is resident the timer time limit and expires, other channels will be redistributed the channel is still idle.
The further preferred scheme of satellite short data communication channel agility distribution method as the present invention, in step 3.2
In, it is preferentially referred specifically to based on grid：Due at present in the world including paging and many wireless communication systems including cellular system
All it is that channel is divided with the grid distance of 20 or 25kHz.
The further preferred scheme of satellite short data communication channel agility distribution method as the present invention, in step 3.2
In, referred to based on qualitative factor by the spectrum scan power samples information of history and the service condition of channel, generation pair
The qualitative factor answered simultaneously is analyzed, and qualitative factor represents the prior information of channel quality condition.
The present invention has the following advantages that compared with prior art：
1) present invention is directed to the short burst communication pattern of low orbit satellite mobile communication system business, and sweep bandwidth is relatively narrow, about counts
MHz is horizontal, and method is simple, and it is few to occupy resource on star, to load radio frequency reception part without being added with requirement, receiver and frequency spectrum on star
Analyzer technology relative maturity, feasibility are high；
2) present invention also avoids the interference from system while the frequency compatibility between satellite and ground system is ensured.
It, preferentially will be in channel distribution to different sub-bands in the case where idle channel resources are enriched；
3) present invention distributes idle channel, while set the channel pot life in real time according to spatial frequency spectrum environment, changes machine
Flexibility processed is high, the frequency range of alternate channel distribution at any time, and utmostly the signal interference between reduction system realizes compatibility, frequency spectrum resource
Utilization rate is high.
Description of the drawings
Fig. 1 is flow chart of the present invention；
Fig. 2 is divided for satellite short data communication system channel.
Specific embodiment
Below with regard to flow chart shown in FIG. 1, with reference to above-mentioned technical solution, the present invention is done into one using embodiment
The description of step.
A kind of satellite short data communication channel agility distribution method, specifically includes following steps：
Step 1, the spaceborne spectrum analyzer of the passing of satelline is with Fixed Time Interval, fixed bandwidth step-scan uplink target frequency
Section；
Step 2, satellite receiver obtains power samples by scanning target frequency bands, and power samples decision method is taken to carry out
Threshold judgement forms resource pool by marker for determination for idle available channel virtual set；
Step 3, it is taken based on that grid is preferential and two kinds of judgment methods of qualitative factor to the channel idle situation in resource pool,
Successively the idle condition of alternative channel is ranked up according to the weight of each method；
Step 4, free channel information is broadcast to ground based terminal, terminal uses distribution signal channel launched；
Step 5, channel is switched using change mechanism to the occupancy of channel.
In step 1, spectrum scan specifically includes following steps：
Step 1.1, satellite carries out a spectrum scan every time τ, by spaceborne spectrum analyzer, with fixation bandwidth
Step-scan uplink target frequency bands, wherein and, and unit for kHz grade, and value is not more than the frequency of a short Burst Channel
Width, the unit of τ is second grade, and value range is in 1s-10s；
Step 1.2, scanning frequency spectrum stepping is less than or equal to minimum channel bandwidth；
Step 1.3, for short burst data communication, time interval is more than the time of signal of transmitting.
In step 2, threshold judgement specifically comprises the following steps：
Step 2.1, satellite receiver obtains power samples by scanning target frequency bands, when satellite reception in certain stepping bandwidth
The power samples of signal are fallen in a specified threshold hereinafter, being then put into the frequency range labeled as potential available channel frequency range
In case being used in next transmission time slot in resource pool；
Step 2.2, power samples threshold value is the actual measured value based on spatial frequency spectrum environment, is considered, terminal-defend
Star communication link design parameter, spaceborne receiver sensitivity design system index and parameter are calculated, final to determine CCA
Limit since the threshold value is by being being calculated by strict regulations and science, has most in channel selection criteria
High weight.
In step 3, the sequence of channel idle situation is specific as follows in resource pool：
Step 3.1, resource pool is by the virtual set that marker for determination is idle available channel, to terminal distribution channel
And new available channel is selected from resource pool during channel change；
Step 3.2, the alternative channel in resource pool, first by being determined based on power samples decision method, then by being based on
Grid preferentially and two kinds of judgment methods of qualitative factor, is arranged the idle condition of alternative channel according to the weight of each method priority
Sequence.
In step 4, channel assignment step is specific as follows：
Step 4.1, in channel resource pool according to idle condition, frequency allocation in the top is selected to ground based terminal
Signal transmitting is carried out, other remaining channels continue to stay in reservation pond；
Step 4.2, channel distribution instruction is sent to ground based terminal by the form of satellite broadcasting
The embodiment of the present invention is the channel access design of satellite short data communication system, with it in burst mode
Under short burst data communication for, to introduce the channel agility distribution based on spectrum scan power samples, step is as follows:
1. the basic service of satellite short data communication system communicates for uplink short data, rate is 100bps and 400bps two
Kind, the effective bandwidth of single 100bps signals is 270Hz, 400bps 848Hz.Due to narrower bandwidth, influence is easily disturbed, is
Interfering with each other for each terminal transmission signal is reduced, setting is about 3.2kHz and 2.7kHz protection intervals respectively between adjacent channel,
Therefore individual channel occupies 3.5kHz bandwidth.
2. the working frequency range of system is uhf band, altogether occupied bandwidth 1MHz.Its frequency range divides as shown in Figure 2.Satellite can fit
600km is answered to 900km tracks, the speed of related movement of the lower satellite of orbit altitude and terminal is faster, and maximum Doppler frequency offset is got over
Greatly.Understand that maximum Doppler frequency offset is about 9.22kHz when orbit altitude is 600km by calculating, the Doppler that frequency range divides
Protection interval should be greater than this value.In view of the influence of interference, the interference protection interval of 50kHz, 100bps are respectively retained at both ends
Retain Doppler's protection interval of 25kHz between frequency band and 400bps are frequent.By 875kHz be further divided into 5 sons
Band, each subband bandwidth are 175kHz, and each 175kHz subbands are made of 50 short burst communication channel.100bps channels account for 4
A sub-band, total number of channels are 200, and the total number of channels of 1 sub-band of 400bps channels is 50.
3. the signal from space is received by the radio frequency reception part of satellite communication load and filters out out of band signal, it is spaceborne
Spectrum analyzer is scanned the frequency range of 1MHz every 5s using 3.5kHz as frequency stepping.Power samples are less than -145dBm's
Frequency point will be marked as idle channel and be put into resource pool.Then grid is preferential and two kinds of judgment methods of qualitative factor by being based on,
Successively the idle condition of alternative channel is ranked up according to the weight of each method.100bps frequency ranges and 400bps frequency ranges it is alternative
Channel separately sorts, that is, forms two resource pools, respectively distribute.
4. satellite passes by, idle channel is selected in resource pool, is sent out the information of preferred channels by the form of broadcast
To ground based terminal, indicate ground based terminal transmitting signal uses channel.Terminal access mode is divided into reservation access and random access：
Reservation is received channel distribution to a certain reserve terminal；It is random to be received as channel distribution to connecing at random in satellite coverage
Enter terminal, terminal is accessed in a manner of Slot-aloha again after determining frequency range.The not the allocated channel of terminal can not emit signal.
5. terminal uses the frequency point transmitting signal of satellite distribution.In the 5s times to communicate after the completion of channel distribution,
If there is the following two kinds situation, then switch frequency point immediately, suboptimum channel is selected in resource pool：
(1) it reserves and receives channel：Such as continuous 5 packet errors；
(2) channel is received at random：Time such as in continuous 5 packet errors or 1s 20% does not receive data；
Receiver performance is then continuing with former channel communication better than the above situation.
6. after being often the communication of 5s, carry out new round spectrum scan and carry out power samples.If certain terminal is currently divided
Allocating channel power level exceeds power samples thresholding, then switches to new channel；If not being less than sampling thresholding, it is continuing with
The channel.
7. if certain terminal, which currently distributes channel power level, is consistently lower than power samples thresholding, persistently occupy channel 25s
Afterwards, system is distributed new idle channel and is switched over automatically, even if the channel still meets requirement in the spectrum scan of a new round.
From the point of view of emulating the ground test situation with Satellite Experiment load, satellite load can find idle channel always
And quick distribution is carried out, the surplus of satellite-ground link is ensure that while interference is evaded.Even if due to the mistake of quick allocation strategy
Accidentally, system gives terminal distribution one active channel, needs the ground based terminal being in emission state and in reception state
Ground communication cell distance it is near enough, just can guarantee that signal can be detected.And the covering model of single star diameter about 5000km
In enclosing, this probability is very small；In addition, system ground terminal transmission signal have it is short sudden, further reduce appoint
The influence that connection disturbs；Finally, due to qualitative factor analysis and the constraint in channel occupancy time limit, even if interference has occurred really,
It will not continue or occur again.
What the present invention did not elaborated partly belongs to techniques well known.
Claims (8)
1. a kind of satellite short data communication channel agility distribution method, which is characterized in that specifically include following steps：
Step 1, the spaceborne spectrum analyzer of the passing of satelline is with Fixed Time Interval, fixed bandwidth step-scan uplink target frequency bands；
Step 2, satellite receiver obtains power samples by scanning target frequency bands, and power samples decision method is taken to carry out thresholding
Judgement forms resource pool by marker for determination for idle available channel virtual set；
Step 3, it is taken based on that grid is preferential and two kinds of judgment methods of qualitative factor to the channel idle situation in resource pool, according to
The weight of each method is successively ranked up the idle condition of alternative channel；
Step 4, free channel information is broadcast to ground based terminal, terminal uses distribution signal channel launched；
Step 5, channel is switched using change mechanism to the occupancy of channel.
2. satellite short data communication channel agility distribution method as described in claim 1, which is characterized in that in step 1, frequency
Spectrum scanning specifically includes following steps：
Step 1.1, satellite carries out a spectrum scan every time τ, by spaceborne spectrum analyzer, is walked with the fixation bandwidth of f
Into scanning uplink target frequency bands, wherein, τ and f, and the unit of f is kHz grades, and value is no more than the frequency of a short Burst Channel
Width, the unit of τ is second grade, and value range is in 1s-10s；
Step 1.2, scanning frequency spectrum stepping is less than or equal to minimum channel bandwidth；
Step 1.3, for short burst data communication, time interval is more than the time of signal of transmitting.
3. satellite short data communication channel agility distribution method as described in claim 1, which is characterized in that in step 2, door
Limit judgement specifically comprises the following steps：
Step 2.1, satellite receiver obtains power samples by scanning target frequency bands, when satellite received signal in certain stepping bandwidth
Power samples fall in a specified threshold hereinafter, the frequency range then is put into resource labeled as potential available channel frequency range
In case being used in next transmission time slot in pond；
Step 2.2, power samples threshold value is the actual measured value based on spatial frequency spectrum environment, is considered, and terminal-satellite leads to
Letter link design parameter, spaceborne receiver sensitivity design system index and parameter are calculated, finally determining CCA thresholdings, by
In the threshold value by being being calculated, therefore have highest weight in channel selection criteria by strict regulations and science
Weight.
4. the satellite short data communication channel agility distribution method as described in claim 1 or 3, which is characterized in that in step 3
In, the sequence of channel idle situation is specific as follows in resource pool：
Step 3.1, resource pool be by the virtual set that marker for determination is idle available channel, to terminal distribution channel and
Channel selects new available channel when changing from resource pool；
Step 3.2, the alternative channel in resource pool, first by being determined based on power samples decision method, then by being based on grid
Preferential and two kinds of judgment methods of qualitative factor are successively ranked up the idle condition of alternative channel according to the weight of each method.
5. satellite short data communication channel agility distribution method as described in claim 1, which is characterized in that in step 4, letter
Road allocation step is specific as follows：
Step 4.1, in channel resource pool according to idle condition, frequency allocation in the top is selected to be carried out to ground based terminal
Signal emits, other remaining channels continue to stay in reservation pond；
Step 4.2, channel distribution instruction is sent to ground based terminal by the form of satellite broadcasting.
6. satellite short data communication channel agility distribution method as described in claim 1, which is characterized in that in steps of 5, letter
Change mechanism in road is specific as follows：
All channels are not a allocated permanent occupancy, following three kinds of situations occur by alternate channel frequency point, in resource pool
Optimal channel assignment is selected in channel to be selected：
(1) in communication process, satellite received signal is of poor quality to a certain extent, breach spaceborne receiver criteria thresholds or
Performance requirement is not achieved；
(2) when using new round frequency-scan data, channel selection procedure exceeds quality in currently distribution channel power level
Factor thresholding；
(3) channel duration of the same frequency range of terminal signaling transmitting occupancy reaches T, and value is generally 5 to 10 times of τ, connects
The channel of receipts machine is resident the timer time limit and expires, other channels will be redistributed the channel is still idle.
7. satellite short data communication channel agility distribution method as claimed in claim 4, it is characterised in that：In step 3.2,
It is preferentially referred specifically to based on grid：Since many wireless communication systems at present in the world including paging and cellular system are all
Channel is divided with the grid distance of 20 or 25kHz.
8. satellite short data communication channel agility distribution method as claimed in claim 4, it is characterised in that：In step 3.2,
Referred to based on qualitative factor by the spectrum scan power samples information of history and the service condition of channel, generating corresponding
Qualitative factor is simultaneously analyzed, and qualitative factor represents the prior information of channel quality condition.
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