CN107566030A - A kind of analogy method and analogue means of DVB multiple access - Google Patents
A kind of analogy method and analogue means of DVB multiple access Download PDFInfo
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Abstract
The invention discloses a kind of analogy method of DVB multiple access, it is used for the simulation of the multiple access based on satellite orbit automatic recognition system, comprised the following steps：A. the user profile based on each terminal user in each cell generates cell signal stream and the cell signal stream is encoded and modulated baseband signal corresponding to the generation cell, and multiple user profile are different corresponding to multiple terminal users in each cell；B. it is corresponding with each cell based on uplink multi-users signal of the baseband signal generation with Simulation Doppler Frequency-Shift with transmitting delay control, the uplink multi-users signal；C. by all the uplink multi-users signal is combined processing corresponding to all cells.The present invention can realize the monitoring of marine vessel target in a wide range of, be advantageous to strengthen the live identification of maritime traffic and supervision.
Description
Technical field
The present invention relates to the ground based terminal simulator field in satellite communication, especially satellite AIS communication systems, specifically
Ground, it is related to a kind of analogy method and analogue means of DVB multiple access.
Background technology
In recent years, with the fast development of World Economics, the industry dependent on Shipping is also rapidly increasing, and causes sea
Domain ships quantity sharply increases, maritime traffic increase in density, encounter rate increase, at the same make the navigation environment of the stretch of coastal water there occurs
Very big change, strengthening the live identification of maritime traffic and supervision becomes particularly significant, and it, which not only contributes to supervision ship, has bar not
It is operated disorderlyly, more can real-time and accurately receives the transmission information of ship, in the case where ship runs into crisis situation, the very first time pair
Ship carries out positioning first aid.
Automatic recognition system (Automatic Identification System, abbreviation AIS) is that international ocean tissue is strong
A kind of new navaid and equipment that system regulation uses, are widely used in marine communication and satellite communication field.AIS has been sent out
General purpose vessel automatic recognition system is transformed into, the major function of watercraft AIS system includes：Ship identification, assist tracking target, be simple
Information interchange and provide other auxiliary informations to avoid colliding.Watercraft AIS system help to realize ship and ship, ship with
Efficient communication between bank base.
Spaceborne AIS systems are the novel systems to grow up on the basis of watercraft AIS system, and it can be in bigger region
In the range of receive ais signal.Reception processing is carried out to spaceborne ais signal, this has great meaning in military and civilian field.
The shortcomings that watercraft AIS system also has its own：Due to being influenceed by transmission path, the communication distance of watercraft AIS system is only
Horizon communication, thus its area coverage is limited, the communication distance scope between ship is 20 nautical miles or so in actual use,
The communication distance on ship opposite bank is 40 nautical miles or so, and which greatly limits the performance of AIS system effectiveness.Therefore spaceborne AIS is proposed
Technology, extend AIS systematic difference scopes.Spaceborne AIS is mainly using the wider up overlay area of satellite, by overlay area
Interior ais signal is acquired, handles and forwarded, and so as to reach the purpose for expanding ais signal service range, realizes in a wide range of
The monitoring of marine vessel target.
At present, how the subject matter that spaceborne AIS systems need to solve effectively is demodulated when being AIS information collisions
Collision alarm, improve ais signal detection probability of the satellite to ship.
The content of the invention
For technological deficiency existing for prior art, according to an aspect of the present invention, it is an object of the invention to provide one
The analogy method of kind DVB multiple access, it is used for the multiple access based on satellite orbit automatic recognition system
Simulation, it comprises the following steps：
A. the user profile based on each terminal user in each cell generates cell signal stream and to the cell signal
Stream is encoded and modulated baseband signal corresponding to the generation cell, and multiple terminal users in each cell
Corresponding multiple user profile are different；
B. believed based on baseband signal generation with Simulation Doppler Frequency-Shift and the uplink multi-users of transmitting delay control
Number, the uplink multi-users signal is corresponding with each cell；
C. by all the uplink multi-users signal is combined processing corresponding to all cells.
Preferably, in the step a, the longitude and latitude of the user profile including the terminal user, the speed of a ship or plane, course and
Time slot, the user profile are fixed or are randomly assigned.
Preferably, the cell signal stream generates as follows：
A1. satellite transit track and substar longitude and latitude are generated in real time according to orbit parameter；
A2. covered based on the satellite transit track generated in real time and substar longitude and latitude generation satellite big
Area；
A3. the big zoning is divided into multiple cells；
A4. the fixed or random user profile is set for each terminal user；
A5. the whole terminal user in the great Qu is allocated in units of the cell, then with described small
Area or to the progress content frame filling of the whole of each cell user profile and according to fixation be randomly assigned for unit
Time slot generate the cell signal stream.
Preferably, the orbit parameter includes eccentricity, semi-major axis, flat neargrazing angle, right ascension of ascending node, orbit inclination angle and near
Place argument.
Preferably, following steps are performed before the step a4：A31. the local zone time of the synchronous terminal user is with defending
Luck row simulated time.
Preferably, the step b comprises the following steps：
B1. satellite and terminal user's relative motion in short-term speed are calculated according to satellite transit track and the position of terminal user
Degree, up-Doppler frequency displacement is predicted based on the speed of related movement in short-term, and Doppler's frequency is carried out to the baseband signal
Shifting formwork is intended；
B2. satellite and terminal user's relative distance are calculated according to satellite transit track and the position of terminal user, and to institute
State baseband signal and carry out transmitting delay control.
According to another aspect of the present invention, a kind of analogue means of DVB multiple access is also provided, it is used
In the simulation of the multiple access based on satellite orbit automatic recognition system, including：
Transmitting information framing module, it is used for the user profile generation cell letter based on each terminal user in each cell
Number stream；
Base-band information processing module, it is used to the cell signal stream is encoded and modulated the generation cell correspondingly
Baseband signal；
Transmitter module, it is used for based on baseband signal generation with Simulation Doppler Frequency-Shift and transmitting delay control
Uplink multi-users signal, and by all the uplink multi-users signal is combined processing corresponding to all cells.
Preferably, the analogue means of the DVB multiple access also includes：
Satellite motion analog module, it is used to generate satellite transit track and substar longitude and latitude in real time according to orbit parameter
Degree；
Satellite coverage area generation module, it is used for based on the satellite transit track generated in real time and the substar
The great Qu of longitude and latitude generation satellite covering；
Terminal communication cell generation module, it is used to the big zoning being divided into multiple cells；
Terminal user is distributed generation module, its be used for for each terminal user set it is fixed or random described in
User profile.
Preferably, the transmitting information framing module in units of the cell by the whole terminal in the great Qu
User is allocated, then carries out content frame filling to the whole user profile of each cell in units of the cell
And generate the cell signal stream according to time slot that is fixed or being randomly assigned.
Preferably, in addition to local world's unified time generation module, when it is used for the local of the synchronous terminal user
Between with satellite transit simulated time.
Preferably, the transmitter module includes：
Simulation Doppler Frequency-Shift module, it is used to calculate satellite and end according to satellite transit track and the position of terminal user
End subscriber speed of related movement in short-term, up-Doppler frequency displacement is predicted based on the speed of related movement in short-term, and to described
Baseband signal carries out Simulation Doppler Frequency-Shift；
Transmitting delay control module, it is used to calculate satellite and terminal according to satellite transit track and the position of terminal user
User's relative distance, and transmitting delay control is carried out to the baseband signal.
The present invention sequentially generates satellite transit track and star for the simulation of ais signal impact simulation and multiple access
Lower longitude and latitude, satellite covering great Qu and its longitude and latitude scope, and some cells are divided, to the letter of terminal transmission in each cell
Number it is acquired, handles and forwards, collision information can be effectively demodulated in AIS information collisions, improves satellite to ship
The ais signal detection probability of oceangoing ship, realize the monitoring of marine vessel target in a wide range of.
Brief description of the drawings
The detailed description made by reading with reference to the following drawings to non-limiting example, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 shows the embodiment of the present invention, a kind of analogy method stream of DVB multiple access
Cheng Tu；
Fig. 2 shows the embodiment of the present invention, the generation step schematic flow sheet of cell signal stream；
Fig. 3 shows the embodiment of the present invention, the scene signal that analog satellite motion and overlay area change
Figure；
Fig. 4 shows the embodiment of the present invention, and satellite covers terminal communication cell generation method in great Qu and shown
It is intended to；
Fig. 5 shows the embodiment of the present invention, based on baseband signal generation with Simulation Doppler Frequency-Shift with
The method flow diagram of the uplink multi-users signal of transmitting delay control；
Fig. 6 shows the first specific embodiment of the present invention, a kind of analogue means of DVB multiple access
Structural representation；
Fig. 7 shows the second specific embodiment of the present invention, a kind of analogue means of DVB multiple access
Structural representation；And
Fig. 8 shows the 3rd specific embodiment of the present invention, a kind of analogue means of DVB multiple access
Structural representation.
Embodiment
Fig. 1 shows the specific embodiment of the present invention, a kind of simulation side of DVB multiple access
Method flow chart, method of the invention can be used for the simulation of the multiple access based on satellite orbit automatic recognition system, do not only have
Propagate beneficial to supervision and be operated without any confusion, more can real-time and accurately receive the transmission information of propagation.Its specifically include as
Lower step：
Step S101 is first carried out, the user profile generation cell signal stream based on each terminal user in each cell is simultaneously
The cell signal stream is encoded and modulated baseband signal corresponding to the generation cell, and it is more in each cell
Multiple user profile are different corresponding to the individual terminal user.It will be appreciated by those skilled in the art that satellite process in orbit
In, the terminal user in signal coverage areas is identified and monitored using spaceborne AIS systems, the terminal user with
The satellite mutually communicates the transmission for realizing signal.Based on the wider up overlay area of satellite, each cell is described
Subregion in overlay area, and there is the terminal user of certain amount in each cell, for example, in Shipping
In industry, each terminal user represents different ships, and the user profile is information corresponding to each ship, such as described
The specific coordinate of terminal user, navigate by water the information such as direction.
Further, based on the user profile, the communications protocol according to ship automatic identification technology system determine when
Gap generates the cell signal stream.Further, by the way that the generation cell pair is encoded, modulated to the cell signal stream
The baseband signal answered.It should be noted that in this step, it is more corresponding to multiple terminal users in each cell
The individual user profile is different.Further, due to the real-time change of satellite in orbit running orbit, the area of coverage of satellite-signal
Domain, terminal user is also dynamic change described in each described cell and the cell.
Then step S102 is performed, based on baseband signal generation with Simulation Doppler Frequency-Shift and transmitting delay control
Uplink multi-users signal, the uplink multi-users signal is corresponding with each cell, i.e., described uplink multi-users signal
In include the user profile of the whole terminal user in the corresponding cell.
Finally, step S103 is performed, by all the uplink multi-users signal is combined corresponding to all cells
Processing.It will be appreciated by those skilled in the art that the multiple signals ECDC of the uplink multi-users signal corresponding to each described cell
After the processing of road, the signal that the DVB in the satellite coverage area receives is formed, so as to simulate multiple access conflict
Scene, realize the purpose of the present invention.
Further, heretofore described user profile includes the longitude and latitude, the speed of a ship or plane, course of each terminal user
And time slot.Specifically, the set-up mode of the user profile can be fixed setting or random distribution, and when using random point
During mode for cloth, random distribution can be carried out to the user profile by formulating distribution function type.More specifically, can incite somebody to action
All the terminal user sets fixed longitude and latitude, the speed of a ship or plane or course in satellite a certain running orbit institute overlay area,
And the time slot used corresponding to each described terminal user during the intra cell communication；Or by a certain operation of the satellite
All distribution function type is specified in the distribution of the terminal user in track institute overlay area, carries out random distribution, and setting meets
Random longitude and latitude, the speed of a ship or plane and the course of the distribution function type, and what is used in respective cell during communication meet
The random time slot of the distribution function, further, the time slot being randomly assigned used in the same cell is not
Repeat.
Further, Fig. 2 shows the embodiment of the present invention, the generation step flow signal of cell signal stream
Figure.As the sub- embodiment of step S101 in embodiment illustrated in fig. 1, it specifically comprises the following steps：
Step S1011, generate satellite transit track and substar longitude and latitude in real time according to orbit parameter.Specifically, it is described
Orbit parameter includes the rails such as satellite eccentricity, semi-major axis, flat neargrazing angle, right ascension of ascending node, orbit inclination angle and argument of perigee
Road parameter.The substar longitude and latitude is earth center and longitude, the latitude value of satellite links at the earth's surface.
Step S1012, covered based on the satellite transit track generated in real time and substar longitude and latitude generation satellite
Gai great Qu.Specifically, with reference to Fig. 3, Fig. 3 shows the embodiment of the present invention, analog satellite motion and overlay area
The schematic diagram of a scenario of change.According to the satellite antenna beam angle and satellite altitude of setting, around the satellite transit track,
Generate the satellite covering great Qu.It will be appreciated by those skilled in the art that with the change of the satellite transit track, the satellite covering
Great Qu geographical position changes in real time.
Step S1013, the big zoning is divided into multiple cells.Specifically, the present invention is shown with reference to Fig. 4, Fig. 4
Embodiment, terminal communication cell generation method schematic diagram in satellite covering great Qu.It will be appreciated by those skilled in the art that
By the satellite transit track, satellite antenna beam angle and satellite altitude value, the border of the great Qu can be determined in real time
Longitude and latitude, in the preferred embodiment shown in Fig. 4, the great Qu and the great Qu borders are formed with exterior domain external described
Great Qu square region is averagely divided into multiple grids, and the region that each of which grid represents is the cell.More have
Body, the area of the cell representated by each grid is 40 nautical miles * 40 nautical miles, or other sizes, be will not be described here.
It should be noted that as shown in figure 4, in the big area edge, it is complete square net that the part cell, which is not, is exceeded
Region outside the great Qu scopes can not be with satellite communication.
Step S1014, the fixed or random user profile is set for each terminal user.The user
Information includes fixed longitude and latitude, the speed of a ship or plane and course, and practical time slot in the cell；Or meet and specify distribution letter
Longitude and latitude, the speed of a ship or plane and the course of several random distributions, and the power load distributing Han Su used in the intra cell communication with
The time slot of machine, will not be described here.
Step S1015, the whole terminal user in the great Qu is allocated in units of the cell, then with
The cell be unit the whole of each cell user profile is carried out content frame filling and according to it is fixed or with
The time slot of machine distribution generates the cell signal stream., will each intra-cell users foundation in a specific embodiment
ITU RM1371-5 agreements, content frame filling is carried out, and use the time slot of distribution, the signal stream of composition 2250 time slot per minute.
In a change case of above-mentioned embodiment illustrated in fig. 2, it will be appreciated by those skilled in the art that the step S1014 it
It is preceding also to include step：The local zone time and satellite transit simulated time of the synchronous terminal user.Specifically, satellite navigation is passed through
System (GPS) obtains world unified time UTC, and the satellite transit simulated time is adjusted, reaches the satellite transit
Simulated time is synchronous with world's unified time UTC；Meanwhile based on time zone where the terminal user, obtain the terminal
User relative to world unified time UTC time difference, so as to which world unified time UTC to be converted to the sheet of the terminal user
The ground time, so as to simulate generation terminal user local UTC time, so as to using world's unified time UTC as basis of reference, make
The local zone time of the terminal user is unified with the satellite transit simulated time.
Fig. 5 shows the embodiment of the present invention, based on baseband signal generation with Simulation Doppler Frequency-Shift with
The method flow diagram of the uplink multi-users signal of transmitting delay control.Son as step S102 in embodiment illustrated in fig. 1 is implemented
Example, it specifically comprises the following steps：
Step S1021, satellite is calculated according to satellite transit track and the position of terminal user and terminal user is relative in short-term
Movement velocity, up-Doppler frequency displacement is predicted based on the speed of related movement in short-term, and the baseband signal carried out more
General Le frequency-shifted analog.It will be appreciated by those skilled in the art that the satellite is unavoidably made relative to terminal user's relative motion
Satellite communication is influenceed into Doppler frequency shift.In this step, predicted according to the speed of related movement in short-term described up more
Time difference caused by general Le frequency displacement, the signal is compensated.
Step S1022, satellite and terminal user's relative distance are calculated according to satellite transit track and the position of terminal user,
And transmitting delay control is carried out to the baseband signal.It will be appreciated by those skilled in the art that due to the satellite and terminal user's phase
The presence adjusted the distance, after the baseband signal transmitting, transmission delay is inevitably caused, further, by sending out in advance
The baseband signal is penetrated, i.e., transmitting delay control is carried out to the baseband signal, it is possible to achieve plesiochronous.
Further, it will be appreciated by those skilled in the art that above-mentioned steps S1021 and the step S1022 can be carried out synchronously,
The two independently of each other, has no effect on, will not be described here.
The device part of the present invention is described in detail below, Fig. 6 shows the first specific embodiment of the present invention,
A kind of analogue means structural representation of DVB multiple access.The analogue means is used for automatic based on satellite orbit
The simulation of the multiple access of identifying system.Specifically, including at least transmitting information framing module, base-band information processing module with
And transmitter module.The transmitting information framing module, base-band information processing module and transmitter module are sequentially connected and led to
News.Further, the transmitting information framing module is used for the user profile generation based on each terminal user in each cell
Cell signal stream, in the range of satellite covering great Qu, the different cells produces different cell signal stream respectively；The base
Information processing module is used to the cell signal stream is encoded and modulated baseband signal corresponding to the generation cell；Institute
Transmitter module is stated to be used for based on baseband signal generation with Simulation Doppler Frequency-Shift with launching the up more of delay control
Subscriber signal, and by all the uplink multi-users signal is combined processing corresponding to all cells.Defended so as to form
The signal that DVB in star covering great Qu receives and the scene for simulating multiple access conflict.
Further, in a change case, Fig. 7 shows the second specific embodiment of the present invention, and a kind of satellite connects
The analogue means structural representation of receipts machine multiple access.As shown in fig. 7, the analogue means includes being sequentially connected and communicating
, satellite motion analog module, satellite coverage area generation module, terminal communication cell generation module, terminal user are distributed life
Into module, transmitting information framing module, base-band information processing module and transmitter module.Wherein on the transmitting information group
The specific descriptions of frame module, base-band information processing module and transmitter module may be referred to specific embodiment in above-mentioned Fig. 6,
It will not go into details for this.Embodiment illustrated in fig. 6 is different from, the satellite motion analog module is used to generate in real time according to orbit parameter to defend
Star running orbit and substar longitude and latitude.Specifically, the satellite motion analog module is according to eccentricity, semi-major axis, flat near-earth
The orbit parameter of the satellites such as angle, right ascension of ascending node, orbit inclination angle and argument of perigee, generate under the satellite transit track and star
Point longitude and latitude.The satellite coverage area generation module is used for based under the satellite transit track generated in real time and the star
The great Qu of point longitude and latitude generation satellite covering.Specifically, the satellite coverage area generation module can pass through the satellite of setting
Antenna beamwidth and satellite altitude, around the satellite transit track, generate the great Qu.Those skilled in the art manage
Solution, the great Qu change the geographical position of the covering in real time with the change of the satellite transit track, not superfluous herein
State.Terminal communication cell generation module is used to the big zoning being divided into multiple cells.On multiple cells
Dividing mode and its distribution in the great Qu, may be referred to Fig. 4 and its specific embodiment, will not be described here.The end
End subscriber distribution generation module is used to set the fixed or random user profile for each terminal user.It is described
User profile bag expands longitude and latitude, the speed of a ship or plane and the course of the terminal user and used time slot etc. and is used to identify the terminal
The peculiar information of user.
Further, in the present embodiment, the transmitting information framing module in units of the cell by the great Qu
The interior whole terminal user is allocated, then the whole user of each cell is believed in units of the cell
Breath carries out content frame filling and generates the cell signal stream according to time slot that is fixed or being randomly assigned.For example, the transmitting
Information framing module is distributed, by the end in each cell according to some great Qu user distribution by the cell
End subscriber carries out content frame filling, and using the time slot of distribution, form 2250 time slot per minute according to ITU RM1371-5 agreements
Signal stream.
Further, it will be appreciated by those skilled in the art that the analogue means also includes generation of local world's unified time mould
Block, when the local zone time that local world's unified time generation module is used for the synchronous terminal user is simulated with satellite transit
Between, specifically, by the way that the local zone time of the terminal user is synchronized with world unified time UTC according to time difference relation,
And the measurement to the satellite transit simulated time according to satellite navigation system, make it synchronous with world's unified time UTC,
So as to generate the local UCT times, satellite transit simulation practice described in fish is unified, realizes each end user local time and generation
Boundary unified time UTC synchronization.
And in the specific embodiment being more highly preferred to of the present invention, Fig. 8 shows the 3rd specific implementation of the present invention
Example, a kind of analogue means structural representation of DVB multiple access.In such embodiments, the simulation dress
Put satellite motion analog module, satellite coverage generation module, terminal the communication cell generation including being sequentially connected and communicating
Module, terminal user are distributed generation module, transmitting information framing module, base-band information processing module and transmitter module, its
In, the transmitting information framing module is also connected and communicated with local UTC generation modules.Fig. 6, embodiment illustrated in fig. 7 are different from,
In the embodiment shown in fig. 8, the emitter further comprises Simulation Doppler Frequency-Shift module and transmitting delay control module.
Wherein, the Simulation Doppler Frequency-Shift module is used to calculate satellite and terminal use according to satellite transit track and terminal user position
Family speed of related movement in short-term, up-Doppler frequency displacement is predicted, and Simulation Doppler Frequency-Shift is carried out to the baseband signal.Institute
It is relative with terminal user for calculating satellite according to satellite transit track and the position of terminal user to state transmitting delay control module
Distance, and transmitting delay control is carried out to the baseband signal.
With continued reference to Fig. 8, the base-band information processing module further comprises the estimated nrzi encoding module of modulation module.Its
In, the nrzi encoding is that non-return-to-zero reversal phase coding module is used to carry out non-return-to-zero direction encoding, specifically, works as original binary
When data are 0, coded data is overturn, and original binary data 1, coded data is kept；The modulation module can
For GMSK modulation, will not be described here.
It will be appreciated by those skilled in the art that the analogy method of the present invention and the specific implementation of analogue means, can pass through satellite
DSP and FPGA collaborative work is realized in communication system.The hardware that the DSP and FPGA passes through the analogue means of the present invention
The Row control of the analogy method of the present invention is realized with reference to software radio.It will be appreciated by those skilled in the art that the DSP and institute
Stating FPGA has the characteristics of high-speed computation, flexible programming, and with powerful IF signal processing ability, data managing capacity and
Communication capacity.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (11)
1. a kind of analogy method of DVB multiple access, it is used for multi-purpose based on satellite orbit automatic recognition system
The simulation of family access, it is characterised in that comprise the following steps：
A. the user profile based on each terminal user in each cell generates cell signal stream and the cell signal is flowed into
Row coding and modulation generate baseband signal corresponding to the cell, and multiple terminal users in each cell are corresponding
Multiple user profile it is different；
B. based on uplink multi-users signal of the baseband signal generation with Simulation Doppler Frequency-Shift with transmitting delay control, institute
It is corresponding with each cell to state uplink multi-users signal；
C. by all the uplink multi-users signal is combined processing corresponding to all cells.
2. analogy method according to claim 1, it is characterised in that in the step a, the user profile includes described
Longitude and latitude, the speed of a ship or plane, course and the time slot of terminal user, the user profile are fixed or are randomly assigned.
3. analogy method according to claim 1 or 2, it is characterised in that the cell signal stream is given birth to as follows
Into：
A1. satellite transit track and substar longitude and latitude are generated in real time according to orbit parameter；
A2. the great Qu based on the satellite transit track generated in real time and substar longitude and latitude generation satellite covering；
A3. the big zoning is divided into multiple cells；
A4. the fixed or random user profile is set for each terminal user；
A5. the whole terminal user in the great Qu is allocated in units of the cell, then using the cell as
Unit the whole of each cell user profile is carried out content frame filling and according to it is fixed or be randomly assigned when
Gap generates the cell signal stream.
4. analogy method according to claim 3, it is characterised in that the orbit parameter includes eccentricity, semi-major axis, put down
Neargrazing angle, right ascension of ascending node, orbit inclination angle and argument of perigee.
5. analogy method according to claim 4, it is characterised in that perform following steps before the step a4：a31.
The local zone time and satellite transit simulated time of the synchronous terminal user.
6. analogy method according to any one of claim 1 to 5, it is characterised in that the step b includes following step
Suddenly：
B1. satellite and terminal user speed of related movement in short-term, base are calculated according to satellite transit track and the position of terminal user
Up-Doppler frequency displacement is predicted in the speed of related movement in short-term, and Doppler frequency shift mould is carried out to the baseband signal
Intend；
B2. satellite and terminal user's relative distance are calculated according to satellite transit track and the position of terminal user, and to the base
Band signal carries out transmitting delay control.
7. a kind of analogue means of DVB multiple access, it is used for multi-purpose based on satellite orbit automatic recognition system
The simulation of family access, it is characterised in that including：
Transmitting information framing module, it is used for the user profile based on each terminal user in each cell and generates cell signal
Stream；
Base-band information processing module, it is used to the cell signal stream is encoded and modulated base corresponding to the generation cell
Band signal；
Transmitter module, it is used for based on baseband signal generation with Simulation Doppler Frequency-Shift and transmitting delay control
Row multiple user signals, and by all the uplink multi-users signal is combined processing corresponding to all cells.
8. analogue means according to claim 7, it is characterised in that also include：
Satellite motion analog module, it is used to generate satellite transit track and substar longitude and latitude in real time according to orbit parameter；
Satellite coverage area generation module, it is used for based on the satellite transit track and the substar longitude and latitude generated in real time
The great Qu of degree generation satellite covering；
Terminal communication cell generation module, it is used to the big zoning being divided into multiple cells；
Terminal user is distributed generation module, and it is used to set the fixed or random user for each terminal user
Information.
9. analogue means according to claim 8, it is characterised in that the transmitting information framing module using the cell as
The whole terminal user in the great Qu is allocated by unit, then to each cell in units of the cell
All the user profile carries out content frame filling and generates the cell signal stream according to time slot that is fixed or being randomly assigned.
10. analogue means according to claim 8, it is characterised in that also including local world's unified time generation module,
It is used for the local zone time of the synchronous terminal user and satellite transit simulated time.
11. the analogue means according to any one of claim 7 to 10, it is characterised in that the transmitter module includes：
Simulation Doppler Frequency-Shift module, it is used to calculate satellite and terminal use according to satellite transit track and the position of terminal user
Family speed of related movement in short-term, up-Doppler frequency displacement is predicted based on the speed of related movement in short-term, and to the base band
Signal carries out Simulation Doppler Frequency-Shift；
Transmitting delay control module, it is used to calculate satellite and terminal user according to satellite transit track and the position of terminal user
Relative distance, and transmitting delay control is carried out to the baseband signal.
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