CN110208822A - A kind of communication means based on low rail moving communication satellite - Google Patents
A kind of communication means based on low rail moving communication satellite Download PDFInfo
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- CN110208822A CN110208822A CN201910452270.9A CN201910452270A CN110208822A CN 110208822 A CN110208822 A CN 110208822A CN 201910452270 A CN201910452270 A CN 201910452270A CN 110208822 A CN110208822 A CN 110208822A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
- G01S19/05—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing aiding data
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
- G01S19/10—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing dedicated supplementary positioning signals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/25—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS
- G01S19/256—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS relating to timing, e.g. time of week, code phase, timing offset
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/29—Acquisition or tracking or demodulation of signals transmitted by the system carrier including Doppler, related
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/30—Acquisition or tracking or demodulation of signals transmitted by the system code related
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- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radio Relay Systems (AREA)
Abstract
A kind of communication means based on low rail moving communication satellite generates the low rail moving communication satellite signal of secure localization time service and is communicated；The signal has the feature that spatial structure: the telecommunication satellite signal is in time domain using time division multiplexing system；Frequency-domain structure: the telecommunication satellite signal uses frequency division multiplexing system in frequency domain；The telecommunication satellite signal is that multi-beam polychrome is multiplexed system, and each wave beam uses one or more sub-band as needed, while meeting the polychrome multiplexing of adjacent beams, to reduce inter-beam interference；At least one sub-band in the telecommunication satellite signal, for broadcasting paging channel signal, i.e. PCH signal；PCH signal is broadcast in the sub-band of the telecommunication satellite signal, removing, and the remaining secure localization time service SPT signal that can be used for wide-band spread spectrum, SPT signal is in the N for broadcasting PCH signalPCHIt is broadcast in a time slot.The present invention designs communication and navigation and merges SPT signal system, realizes that positioning time service and anti-interference ability are promoted.
Description
Technical field
The invention belongs to field of satellite navigation, and it is mobile logical to relate generally to a kind of low rail based on tamper-resistant secure positioning time service
Believe the communication means of satellite-signal.
Background technique
As Global Satellite Navigation System (Global Navigation Satellite System, GNSS) develops, mesh
The preceding basic configuration for having formed four big GNSS, the application based on GNSS gradually penetrate into the every aspect of national economy life, at
For indispensable national basis facility.Meanwhile " fragility " that GNSS signal is intrinsic, as signal landing power is low, vulnerable to dry
It disturbs, cheated, cause the extensive concern of people.
Currently, Constellation of Low Earth Orbit Satellites is vigorously developed both at home and abroad.The inherent advantage that low orbit satellite has track low, and signal
It lands power limit and is higher than GNSS signal, " fragility " of satellite navigation signals can be made up.It is defended using low rail mobile communication
It is a kind of effective means that star, which broadcasts admittance fusion signal, and signal of communication has the advantages that power height, anti-deception, merges navigation signal
Ranging time service ability, be capable of providing secure localization time service (Security Positioning and Timing, SPT), not only
Can assisted GNSS promote indoor availability, service hoisting GNSS ability can also be when GNSS be unavailable as low precision
Standby system uses.
It is first plan based on low rail moving communication satellite provide positioning time signal be high integrity GPS project (or
For iGPS project), iGPS plan utilization next generation iridium satellite (Iridium Next) low earth orbit communication satellite system broadcasts class
GPS signal and GPS Supplemental Enhancement Information are accelerated to ask when positioning for the first time, directly acquire military code signal, improve positioning accuracy and resist
Interference performance.IGPS has carried out adaptability reform to former iridium satellite signal, broadcasts navigational range using idle communication channel resources
Signal (patent No.: US 7579987B2), but its uplink signal and downlink signal use common-frequency time division structure, navigation signal is
It discontinuously broadcasts, when heavy traffic, positioning timing function may be interrupted.
Final iGPS project is not implemented on next-generation iridium satellite, instead has broadcast a satellite positioning time service
(Satellite Time and Location, STL) signal.STL is redesigned to the paging channel of iridium satellite signal,
It is a 25kHz character rate, using QPSK.Paging channel frequency may be 1626.104MHz, be to unidirectional time slot
20.32ms the improvement carried out.The proprietary STL burst includes a CW, a PRN code sequence and modulation data.STL is prominent
It sends out average every 1.4s to broadcast once, time-division poll is broadcast in the multiple wave beams of iridium satellite.
The design of STL signal system is limited to original iridium communication system, in order to reduce the influence to signal system, only
On the basis of original iridium communication signal system, some small improvement have been carried out.Therefore, STL signal be a pulse regime, it is low
The high power signals of duty ratio, narrowband (25kcps).STL signal lands power ratio GPS high 30dB, can use, compare indoors
In GNSS signal, availability is improved.But since STL is narrowband spread spectrum pulse signal, and GNSS is wide-band spread spectrum letter
Number, the anti-interference ability of STL signal itself is promoted limited.
Research of the country in terms of merging system based on the admittance of low rail moving communication satellite is also in the initial stage, but
There are some achievements in terms of communication and navigation fusion signal system.Patent is " a kind of to realize worldwide navigation positioning using iHCO telecommunication satellite
Method " (patent No.: CN 201310325604.9) realized using the navigation signal that iHCO telecommunication satellite forwarding ground uploads it is fixed
Bit function.Patent " the navigation signal communication means based on digital watermarking and compressed sensing " (patent No.: CN
201410119558.1) measurement is compressed to the watermarking images for being concealed with navigation signal by compressed sensing technology to be counted on a small quantity
According to, with this low volume data substitution watermarking images transmitted, realize the secure communication of navigation signal.Patent " satellite navigation communication
Integral method and system " (patent No.: CN 201410514108.2) provides a kind of satellite navigation communicating integral method, will
Navigation signal and signal of communication carry out multi-carrier modulation, send after obtaining modulated signal.Patent " broadcast positioning signals generation side
Ranging spreading code is then hidden in the logical of OFDM modulation by method, localization method and device " (patent No.: CN 201010517356.4)
Believe in signal, realizes positioning function.
It can be seen that above-mentioned patent usually adds the navigation signal of a similar GNSS signal in the communication signal, do not have
Have and is designed for the characteristics of signal of communication.IGPS patent broadcasts narrowband PRN using idle communication traffic channel, and positioning is awarded
Shi Gongneng is not ensured；STL signal is then that unidirectional time slot original to iridium satellite improves, and is a kind of narrow-band impulse spread spectrum letter
Number, itself anti-interference ability is limited.
Summary of the invention
It is an object of the invention to: overcome the deficiencies in the prior art provides one kind and is based on for low rail moving communication satellite
Tamper-resistant secure positions the communication means of the low rail moving communication satellite signal of time service, and design communication and navigation merges SPT signal body
System realizes that positioning time service and anti-interference ability are promoted.
The technical solution of the invention is as follows:
A kind of communication means based on low rail moving communication satellite generates the low rail moving communication satellite of secure localization time service
Signal is communicated using the low rail moving communication satellite signal of the secure localization time service；The telecommunication satellite signal has such as
Lower feature:
Spatial structure: the telecommunication satellite signal, using time division multiplexing system, carries out communication industry in time domain with basic frame, time slot
Business；Signal is with TFFor a basic frame length, each basic frame is divided into NslotA time slot, each slot length are Tslot=TF/Nslot；
Frequency-domain structure: the telecommunication satellite signal uses frequency division multiplexing system in frequency domain, and entire downstream bands occupy bandwidth BW,
It is divided into NsubbandA BWsubband=BW/NsubbandSub-band, each sub-band is divided into multiple intercarriers as needed
Every；
The telecommunication satellite signal is that multi-beam polychrome is multiplexed system, and each wave beam uses one or more son as needed
Frequency band, while meeting the polychrome multiplexing of adjacent beams, to reduce inter-beam interference；
At least one sub-band in the telecommunication satellite signal, for broadcasting paging channel signal, i.e. PCH signal；PCH letter
Number it is unidirectional downlink signal, is used for down-going synchronous, called paging and broadcast message, is fixed on a sub-band and broadcasts；PCH letter
Number using a basic frame NPCHA time slot, the frame length of PCH signal are TPCH=NPCH·Tslot；
PCH signal is broadcast in the sub-band of the telecommunication satellite signal, removing, and the remaining safety that can be used for wide-band spread spectrum is fixed
Position time service SPT signal, SPT signal is in the N for broadcasting PCH signalPCHIt is broadcast in a time slot.
PCH signal is broadcast by the way of time-division poll between different beams under the same telecommunication satellite, to avoid between wave beam
Co-channel interference.SPT signal also carries out time-division poll between wave beam and broadcasts, to avoid the co-channel interference between wave beam.
The SPT signal, obtains by the following method:
(1) SPT signal frame structure is designed: in the N for broadcasting PCH signalPCHIn a time slot, do not broadcast other control information and
Business information, the frame length of SPT signal are limited to the frame length of PCH signal, by introducing wide-band spread spectrum pseudo noise code PRN, realize and survey
Away from, positioning and timing function；
(2) SPT signal wide-band spread spectrum generates: according to the SPT signal frame structure of design, generating spreading code, carries out broadband expansion
Frequency modulation system and SPT signal framing；
(3) design wave beam poll pattern: SPT signal carries out time-division poll in multiple wave beams and broadcasts, and polling mode is by wave beam
Poll pattern determines；
(4) beam selection and SPT signal broadcast: by the SPT signal frame of generation, by digital beam-forming, corresponding
Wave beam is broadcast.
The SPT signal frame structure, specifically:
(1.1) PCH signal frequency of use is minimum or the highest sub-band of frequency, i.e. PCH signal are located at entire BW bandwidth
Side on, SPT signal use remaining BW-BWsubbandFrequency band；Each basic frame length TF, PCH signal occupancy TPCH, using every
The N of a basic framePCHA time slot is broadcast, and SPT signal is also in this NPCHIt is broadcast in a time slot；
(1.2) a length of T of SPT signal frameSPT, TSPT≤TPCH, it is made of continuous wave CW and wide-band spread spectrum PRN two parts, continuously
Wave CW is used for signal capture, and wide-band spread spectrum PRN code part is used to measure and the text of SPT signal is broadcast；
(1.3) length of continuous wave CW is TCW, 0≤TCW≤1/2TSPT, work as TCWWhen=0, SPT signal is free of CW；
(1.4) wide-band spread spectrum PRN code part duration TPRN=TSPT-TCW。
The SPT signal wide-band spread spectrum generates, and obtains by the following method:
(2.1) the spread spectrum PRN code of SPT signal, including pilot tone PRN code and data PRN code are generated；
PRN code rate is Rc, chip width is Tc=1/Rc, the bandwidth of PRN code signal is no more than BW-BWsubband, i.e. 2Rc
≤BW-BWsubband, pilot tone PRN code sequence { cp,iLength be NpA chip, the data PRN code sequence after modulating SPT signal text
{cd,iLength be NdA chip.
(2.2) complete 1 or complete -1 sequence of CW baseband signal are generated；
The length of CW is equal to NCWA chip width, base band are equivalent to the sequence { c of one complete 1 or complete -1CW,i, Ke Yixuan
Select cCW,i=1, i=0 ..., NCW-1；
(2.3) CW of SPT signal, pilot tone PRN code and data PRN code carry out the time-division, there is (NCW+Np+Nd)Tc=TSPT, SPT
The baseband representation s of signalSPT(t) are as follows:
In formula, p (t) is that width is TcRectangular function, p (t) is defined as:
(2.4) the baseband representation s of SPT signalSPT(t) it is filtered through a symmetrical FIR low pass filter, sSPT(t)
Low-pass filtering postscript is
The SPT signal wide-band spread spectrum generates, and obtains by the following method:
(2.1) the spread spectrum PRN code of SPT signal, including pilot tone PRN code and data PRN code are generated；
PRN code rate is Rc, chip width is Tc=1/Rc；The bandwidth of PRN code signal is not more than BW-BWsubband, i.e. 2Rc
≤BW-BWsubband；Pilot tone PRN code sequence { cp,iLength be Np,dA chip, the data PRN code sequence after modulating SPT text
{cd,iLength be Np,dA chip；
(2.2) complete 1 or complete -1 sequence of CW baseband signal are generated；
The length of CW is equal to NCWA chip width, base band are equivalent to the sequence { c of one complete 1 or complete -1CW,i, cCW,i=
1, i=0 ..., NCW-1；
(2.3) the pilot tone PRN code of SPT signal and data PRN code are located in quadrature branch, carry out the time-division with CW, there is (NCW+
Np,d)Tc=TSPT, the baseband representation s of SPT signalSPT(t) are as follows:
sSPT(t)=sSPT,I(t)+jsSPT,Q(t)
In formula, sSPT,IIt (t) is I tributary signal, sSPT,Q(t) it is Q tributary signal, respectively indicates are as follows:
(2.4) I tributary signal sSPT,I(t) and Q tributary signal sSPT,Q(t) it is filtered through the same FIR low pass filter
Wave, it is filtered to be respectivelyWithLow-pass filtering postscript is
The design wave beam poll pattern, obtains by the following method:
(3.1) low rail moving communication satellite shares NbeamA wave beam, is equally divided into NGroupGroup, every group has N number of wave beam, N=
Nbeam/NGroup；In order to shorten the polling interval of SPT signal, while broadcasting NGroupA SPT signal, each SPT signal is in N number of wave
Time-division poll is carried out in beam；
(3.2) SPT signal is according to predetermined manner, the successively poll between N number of wave beam, wave beam poll pattern are as follows: wave beam 1, wave
Beam 2 ..., wave beam N, wave beam 1, wave beam 2 ..., wave beam N ...；
(3.3) from the point of view of a wave beam, every NTFTime broadcasts an a length of TSPTSPT signal frame, time domain duty
Than for TSPT/(N·TF)。
The design wave beam poll pattern, obtains by the following method:
(3.1) low rail moving communication satellite shares NbeamA wave beam, is equally divided into NGroupGroup, every group has N number of wave beam, N=
Nbeam/NGroup；In order to shorten the polling interval of SPT signal, while broadcasting NGroupA SPT signal, each SPT signal is in N number of wave
Time-division poll is carried out in beam；
(3.2) SPT signal is according to random fashion, the random time division poll between N number of wave beam；Wave beam poll pattern is by a puppet
Randomizer control, each SPT signal, pseudorandom number generator export the number n that N is arrived in 1beam；
(3.3) from the point of view of a wave beam, the interval that SPT signal occurs is to differ at random, is equivalent to special when introducing jump
Property.
The beam selection and SPT signal broadcast, obtains by the following method:
(4.1) according to wave beam poll pattern, selecting the wave beam for broadcasting SPT signal is wave beam nbeam；
(4.2) digital beam-forming DBF coefficient is adjusted, by SPT signal modulation to wave beam nbeam；
(4.3) it is successively broadcast after DAC, up-conversion, amplification through multibeam antenna.
The invention discloses a kind of unjammable navigation signal systems based on low rail moving communication satellite, realize secure localization
Time service service, can with low rail mobile communication signal depth integration, compared with method compare, method disclosed by the invention has
Following advantage:
(1) the SPT signal that provides of the present invention, for low rail mobile communication signal system feature, PCH signal broadcast when
Gap is broadcast, and be can make full use of power, frequency and the time interval resource of satellite, is not impacted to communication service.
(2) the SPT signal that the present invention provides, using wide-band spread spectrum system, compared with narrowband spreads system, anti-interference ability
It is obviously improved.
(3) SPT signal of the invention uses wide-band spread spectrum, and bit rate is high, compared with narrowband spreads system, improves
Range performance and time service precision.
(4) present invention by design SPT signal time-division poll pattern, realize jump when+wide-band spread spectrum combination, further mention
Rise the interference free performance of signal.
Detailed description of the invention
Fig. 1 is anti-interference SPT signaling plan disclosed by the invention；
Fig. 2 is the when separation structure of low rail moving communication satellite signal
Fig. 3 is the frequency division structure of low rail moving communication satellite signal
Fig. 4 is the time-domain and frequency-domain relation schematic diagram of SPT signal and PCH signal
Fig. 5 is SPT signal frame structure schematic diagram
Fig. 6 is time-division poll pattern schematic diagram at equal intervals
Fig. 7 is random time division poll pattern schematic diagram
Fig. 8 is that SPT signal generates and broadcasts schematic diagram.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
The invention belongs to field of satellite navigation, in particular to a kind of secure localization time service based on low rail moving communication satellite
(Security Positioning and Timing, SPT) signal modulating method and generation method.
The invention based on low rail moving communication satellite signal use time-division/frequency division/space division hybrid scheme, i.e. downlink business
Signal uses TDMA+FDMA+ multi-beam system, and uplink and downlink are also frequency division.
To achieve the above object, the invention discloses a kind of based on the low rail shifting with tamper-resistant secure positioning time service performance
The communication means of dynamic telecommunication satellite signal, as shown in Figure 1.
The low rail moving communication satellite signal for generating secure localization time service, it is mobile using the low rail of the secure localization time service
Telecommunication satellite signal is communicated；The telecommunication satellite signal has the feature that
Spatial structure: the telecommunication satellite signal, using time division multiplexing system, carries out communication industry in time domain with basic frame, time slot
Business；Signal is with TFFor a basic frame length, each basic frame is divided into NslotA time slot, each slot length are Tslot=TF/Nslot；
As shown in Figure 2.
Frequency-domain structure: the telecommunication satellite signal uses frequency division multiplexing system in frequency domain, and entire downstream bands occupy bandwidth BW,
It is divided into NsubbandA BWsubband=BW/NsubbandSub-band, each sub-band is divided into multiple intercarriers as needed
Every；As shown in Figure 3.
The telecommunication satellite signal is that multi-beam polychrome is multiplexed system, and each wave beam uses one or more son as needed
Frequency band, while meeting the polychrome multiplexing of adjacent beams, to reduce inter-beam interference；
At least one sub-band in the telecommunication satellite signal, for broadcasting paging channel signal, i.e. PCH signal；PCH letter
Number it is unidirectional downlink signal, is used for down-going synchronous, called paging and broadcast message, is fixed on a sub-band and broadcasts；PCH letter
Number using a basic frame NPCHA time slot, the frame length of PCH signal are TPCH=NPCH·Tslot；In order to avoid between wave beam
Co-channel interference, PCH signal is broadcast by the way of time-division poll between different beams under the same satellite.
PCH signal is broadcast in the sub-band of the telecommunication satellite signal, removing, and the remaining safety that can be used for wide-band spread spectrum is fixed
Position time service SPT signal, SPT signal is in the N for broadcasting PCH signalPCHIt is broadcast in a time slot.SPT signal is a wide-band spread spectrum, should
Wide-band spread spectrum SPT signal uses the sub-band other than PCH signal sub-band, has positioning time service ability, SPT signal is also in wave beam
Between carry out time-division poll and broadcast, SPT signal and PCH signal to broadcast relationship as shown in Figure 4.
The SPT signal can be obtained as shown in figure 5, being made of continuous wave CW and PRN code two parts by two ways
It arrives:
First way:
(1) SPT signal frame structure is designed: in the N for broadcasting PCH signalPCHIn a time slot, do not broadcast other control information and
Business information, the frame length of SPT signal are limited to the frame length of PCH signal, by introducing wide-band spread spectrum pseudo noise code PRN, realize and survey
Away from, positioning and timing function；
SPT signal frame structure, specifically:
(1.1) PCH signal frequency of use is minimum or the highest sub-band of frequency, i.e. PCH signal are located at entire BW bandwidth
Side on, SPT signal use remaining BW-BWsubbandFrequency band；Each basic frame length TF, PCH signal occupancy TPCH, using every
The N of a basic framePCHA time slot is broadcast, and SPT signal is also in this NPCHIt is broadcast in a time slot；
(1.2) a length of T of SPT signal frameSPT, TSPT≤TPCH, it is made of continuous wave CW and wide-band spread spectrum PRN two parts, continuously
Wave CW is used for signal capture, and wide-band spread spectrum PRN code part is used to measure and the text of SPT signal is broadcast；
(1.3) length of continuous wave CW is TCW, 0≤TCW≤1/2TSPT, work as TCWWhen=0, SPT signal is free of CW；
(1.4) wide-band spread spectrum PRN code part duration TPRN=TSPT-TCW。
(2) SPT signal wide-band spread spectrum generates: according to the SPT signal frame structure of design, generating spreading code, carries out broadband expansion
Frequency modulation system and SPT signal framing；
SPT signal wide-band spread spectrum generates, and obtains by the following method:
(2.1) the spread spectrum PRN code of SPT signal, including pilot tone PRN code and data PRN code are generated；
PRN code rate is Rc, chip width is Tc=1/Rc, the bandwidth of PRN code signal is no more than BW-BWsubband, i.e. 2Rc
≤BW-BWsubband, pilot tone PRN code sequence { cp,iLength be NpA chip, the data PRN code sequence after modulating SPT signal text
{cd,iLength be NdA chip.
(2.2) complete 1 or complete -1 sequence of CW baseband signal are generated；
The length of CW is equal to NCWA chip width, base band are equivalent to the sequence { c of one complete 1 or complete -1CW,i, Ke Yixuan
Select cCW,i=1, i=0 ..., NCW-1；
(2.3) CW of SPT signal, pilot tone PRN code and data PRN code carry out the time-division, there is (NCW+Np+Nd)Tc=TSPT, SPT
The baseband representation s of signalSPT(t) are as follows:
In formula, p (t) is that width is TcRectangular function, p (t) is defined as:
(2.4) the baseband representation s of SPT signalSPT(t) it is filtered through a symmetrical FIR low pass filter, sSPT(t)
Low-pass filtering postscript is
The second way:
SPT signal wide-band spread spectrum generates, and obtains by the following method:
(2.1) the spread spectrum PRN code of SPT signal, including pilot tone PRN code and data PRN code are generated；
PRN code rate is Rc, chip width is Tc=1/Rc；The bandwidth of PRN code signal is not more than BW-BWsubband, i.e. 2Rc
≤BW-BWsubband；Pilot tone PRN code sequence { cp,iLength be Np,dA chip, the data PRN code sequence after modulating SPT text
{cd,iLength be Np,dA chip；
(2.2) complete 1 or complete -1 sequence of CW baseband signal are generated；
The length of CW is equal to NCWA chip width, base band are equivalent to the sequence { c of one complete 1 or complete -1CW,i, cCW,i=
1, i=0 ..., NCW-1；
(2.3) the pilot tone PRN code of SPT signal and data PRN code are located in quadrature branch, carry out the time-division with CW, there is (NCW+
Np,d)Tc=TSPT, the baseband representation s of SPT signalSPT(t) are as follows:
sSPT(t)=sSPT,I(t)+jsSPT,Q(t)
In formula, sSPT,IIt (t) is I tributary signal, sSPT,Q(t) it is Q tributary signal, respectively indicates are as follows:
(2.4) I tributary signal sSPT,I(t) and Q tributary signal sSPT,Q(t) it is filtered through the same FIR low pass filter
Wave, it is filtered to be respectivelyWithLow-pass filtering postscript is
(3) design wave beam poll pattern: SPT signal carries out time-division poll in multiple wave beams and broadcasts, and polling mode is by wave beam
Poll pattern determines；
Also there are two types of implementations for wave beam poll pattern:
The first scheme, as shown in Figure 6:
Wave beam poll pattern is designed, is obtained by the following method:
(3.1) low rail moving communication satellite shares NbeamA wave beam, is equally divided into NGroupGroup, every group has N number of wave beam, N=
Nbeam/NGroup；In order to shorten the polling interval of SPT signal, while broadcasting NGroupA SPT signal, each SPT signal is in N number of wave
Time-division poll is carried out in beam；
(3.2) SPT signal is according to predetermined manner, the successively poll between N number of wave beam, wave beam poll pattern are as follows: wave beam 1, wave
Beam 2 ..., wave beam N, wave beam 1, wave beam 2 ..., wave beam N ...；
(3.3) from the point of view of a wave beam, every NTFTime broadcasts an a length of TSPTSPT signal frame, time domain duty
Than for TSPT/(N·TF)。
Second scheme, as shown in Figure 7:
Wave beam poll pattern is designed, is obtained by the following method:
(3.1) low rail moving communication satellite shares NbeamA wave beam, is equally divided into NGroupGroup, every group has N number of wave beam, N=
Nbeam/NGroup；In order to shorten the polling interval of SPT signal, while broadcasting NGroupA SPT signal, each SPT signal is in N number of wave
Time-division poll is carried out in beam；
(3.2) SPT signal is according to random fashion, the random time division poll between N number of wave beam；Wave beam poll pattern is by a puppet
Randomizer control, each SPT signal, pseudorandom number generator export the number n that N is arrived in 1beam；
(3.3) from the point of view of a wave beam, the interval that SPT signal occurs is to differ at random, is equivalent to special when introducing jump
Property.
(4) beam selection and SPT signal broadcast: by the SPT signal frame of generation, by digital beam-forming, corresponding
Wave beam is broadcast.
Beam selection and SPT signal broadcast, obtain by the following method:
(4.1) according to wave beam poll pattern, selecting the wave beam for broadcasting SPT signal is wave beam nbeam；
(4.2) digital beam-forming DBF coefficient is adjusted, by SPT signal modulation to wave beam nbeam；
(4.3) it is successively broadcast after DAC, up-conversion, amplification through multibeam antenna.
Integrated signal generates and broadcasts two parts, and SPT signal generates and to broadcast schematic diagram as shown in Figure 8.
The SPT signal that above scheme of the present invention provides, has a characteristic that
(1) it is directed to low rail mobile communication signal system feature, is broadcast in the time slot of PCH signal broadcast, it can be abundant
Using the power of satellite, frequency and time interval resource, communication service is not impacted.
(2) the SPT signal that the present invention provides, using wide-band spread spectrum system, compared with narrowband spreads system, anti-interference ability
It is obviously improved.
(3) the SPT signal that the present invention provides uses wide-band spread spectrum, and bit rate is high, compared with narrowband spreads system, mentions
Range performance and time service precision are risen.
The present invention by design SPT signal time-division poll pattern, realize jump when+wide-band spread spectrum combination, further promoted
The interference free performance of signal.
It is as follows that the present invention provides embodiment:
It is as follows that tamper-resistant secure disclosed by the invention positions the low rail moving communication satellite signal system operating procedure of time service:
(1) spatial structure.
For signal as unit of frame, a basic frame length is TF=40ms, a frame are divided into Nslot=20 time slots, at one
Gap length is Tslot=2ms.
(2) frequency-domain structure.
Signal of communication uses frequency division multiplexing system in frequency domain, and entire downstream bands occupy bandwidth BW=6MHz, are divided into
Nsubband=40 BWsubbandThe sub-band of=150kHz, each sub-band can be divided into multiple smaller loads as needed
Wave spacing is such as divided into the carrier wave interval of 5 30kHz.
(3) multibeam antenna polychrome is multiplexed system
Low rail moving communication satellite shares Nbeam=50 wave beams are multiplexed system using polychrome, and each wave beam is as needed
Using one or more 150kHz sub-band, while meeting the polychrome multiplexing of adjacent beams, reduces inter-beam interference.
(4) paging channel (PCH) signal.
PCH signal uses the N of a basic framePCH=8 time slots, length TPCH=16ms, before each basic frame
16ms is broadcast.In order to avoid the co-channel interference between wave beam, PCH signal uses time-division poll between different beams under the same satellite
Mode is broadcast.The minimum sub-band 150kHz of PCH signal frequency of use, the 30kHz carrier wave among 5 carrier waves are broadcast.
(5) secure localization time service (SPT) signal.
SPT signal is broadcast in 8 time slots for broadcasting PCH signal, and SPT signal is a wide-band spread spectrum, the wide-band spread spectrum
SPT signal use PCH sub-band other than 5.85MHz sub-band, have positioning time service ability, SPT signal also between wave beam into
Row time-division poll is broadcast, the method is as follows:
1) SPT signal frame structure.
SPT signal is consistent with PCH signal, and also preceding 8 time slots of each basic frame are broadcast, SPT signal frame length TSPT=
16ms.It is made of continuous wave (CW) and wide-band spread spectrum PRN two parts, CW is used for the fast Acquisition of signal, wide-band spread spectrum PRN code portion
The text for precise measurement and SPT signal is divided to broadcast.The length of CW is TCW=4ms.
2) SPT signal wide-band spread spectrum generates.
The length of wide-band spread spectrum PRN code part is 12ms, is divided into pilot tone PRN code and data PRN code, pilot tone and data are located at
Orthogonal two branch road.PRN code rate is Rc=2.046Mcps, pilot tone PRN code sequence { cp,iPrimary key length be Np,d=
2046 chips, the data PRN code sequence { c after modulating the text of SPT signald,iPrimary key length is also 2046 chips, one
A primary key period is 1ms, and 12ms is 12 primary key periods.
Generate complete 1 or complete -1 sequence of CW baseband signal.The length of CW is equal to NCW=8184 chip width, base band etc.
Valence -1 sequence { c in one complete 1 or entirelyCW,i, cCW,i=1, i=0 ..., NCW-1；
The pilot tone PRN code and data PRN code of SPT signal carry out time-division, the baseband representation s of SPT signal with CWSPT(t) are as follows:
sSPT(t)=sSPT,I(t)+jsSPT,Q(t)
In formula, sSPT,IIt (t) is I tributary signal, sSPT,Q(t) it is Q tributary signal, respectively indicates are as follows:
sSPT,I(t) and sSPT,Q(t) it is filtered through the same FIR low pass filter, it is filtered to be respectivelyWithLow-pass filtering postscript is
3) wave beam poll design.
By the N of low rail moving communication satellitebeam=50 wave beams, are equally divided into NGroup=2 groups, every group has N=25 wave
Beam, while 2 SPT signals are broadcast, each SPT signal carries out time-division poll in 25 wave beams；Wave beam poll pattern is by one
Pseudorandom number generator control, each SPT signal, pseudorandom number generator export one in 1 to 25 number nbeam, SPT
Signal is according to random fashion, the poll between 25 wave beams；From the point of view of a wave beam, the interval that SPT signal occurs is to differ at random
, it is equivalent to characteristic when introducing jump, average received is divided into 25*40ms=1s between SPT signal.
4) beam selection and SPT signal broadcast.
According to wave beam poll pattern, selecting the wave beam for broadcasting SPT signal is wave beam nbeam；Adjust digital beam-forming
(DBF) coefficient, by SPT signal modulation to wave beam nbeam；After DAC, up-conversion, amplification, broadcast through multibeam antenna.
The content that description in the present invention is not described in detail belongs to the well-known technique of those skilled in the art.
Claims (10)
1. a kind of communication means based on low rail moving communication satellite, it is characterised in that: the low rail for generating secure localization time service moves
Dynamic telecommunication satellite signal, is communicated using the low rail moving communication satellite signal of the secure localization time service；The telecommunication satellite
Signal has the feature that
Spatial structure: the telecommunication satellite signal, using time division multiplexing system, carries out communication service in time domain with basic frame, time slot；
Signal is with TFFor a basic frame length, each basic frame is divided into NslotA time slot, each slot length are Tslot=TF/Nslot；
Frequency-domain structure: the telecommunication satellite signal uses frequency division multiplexing system in frequency domain, and entire downstream bands occupy bandwidth BW, divides
For NsubbandA BWsubband=BW/NsubbandSub-band, each sub-band is divided into multiple carrier wave intervals as needed；
The telecommunication satellite signal is that multi-beam polychrome is multiplexed system, and each wave beam uses one or more son frequency as needed
Band, while meeting the polychrome multiplexing of adjacent beams, to reduce inter-beam interference；
At least one sub-band in the telecommunication satellite signal, for broadcasting paging channel signal, i.e. PCH signal；PCH signal is
Unidirectional downlink signal is used for down-going synchronous, called paging and broadcast message, is fixed on a sub-band and broadcasts；PCH signal makes
With the N of a basic framePCHA time slot, the frame length of PCH signal are TPCH=NPCH·Tslot；
PCH signal is broadcast in the sub-band of the telecommunication satellite signal, removing, and the remaining secure localization that can be used for wide-band spread spectrum is awarded
When SPT signal, SPT signal is in the N for broadcasting PCH signalPCHIt is broadcast in a time slot.
2. a kind of communication means based on low rail moving communication satellite according to claim 1, it is characterised in that: same
PCH signal is broadcast by the way of time-division poll between different beams under telecommunication satellite, to avoid the co-channel interference between wave beam.SPT
Signal also carries out time-division poll between wave beam and broadcasts, to avoid the co-channel interference between wave beam.
3. a kind of communication means based on low rail moving communication satellite according to claim 1, it is characterised in that: described
SPT signal, obtains by the following method:
(1) SPT signal frame structure is designed: in the N for broadcasting PCH signalPCHIn a time slot, other control information and business are not broadcast
Information, the frame length of SPT signal are limited to the frame length of PCH signal, by introducing wide-band spread spectrum pseudo noise code PRN, realize ranging, determine
Position and timing function；
(2) SPT signal wide-band spread spectrum generates: according to the SPT signal frame structure of design, generating spreading code, carries out wide-band spread spectrum tune
System and SPT signal framing；
(3) design wave beam poll pattern: SPT signal carries out time-division poll in multiple wave beams and broadcasts, and polling mode is by wave beam poll
Pattern determines；
(4) beam selection and SPT signal broadcast: by the SPT signal frame of generation, by digital beam-forming, in corresponding wave beam
It is broadcast.
4. a kind of communication means based on low rail moving communication satellite according to claim 3, it is characterised in that: described
SPT signal frame structure, specifically:
(1.1) PCH signal frequency of use is minimum or the highest sub-band of frequency, i.e. the PCH signal side that is located at entire BW bandwidth
On, SPT signal uses remaining BW-BWsubbandFrequency band；Each basic frame length TF, PCH signal occupancy TPCH, use each base
The N of this framePCHA time slot is broadcast, and SPT signal is also in this NPCHIt is broadcast in a time slot；
(1.2) a length of T of SPT signal frameSPT, TSPT≤TPCH, it is made of continuous wave CW and wide-band spread spectrum PRN two parts, continuous wave CW
For signal capture, wide-band spread spectrum PRN code part is used to measure and the text of SPT signal is broadcast；
(1.3) length of continuous wave CW is TCW, 0≤TCW≤1/2TSPT, work as TCWWhen=0, SPT signal is free of CW；
(1.4) wide-band spread spectrum PRN code part duration TPRN=TSPT-TCW。
5. a kind of communication means based on low rail moving communication satellite according to claim 3, it is characterised in that: described
SPT signal wide-band spread spectrum generates, and obtains by the following method:
(2.1) the spread spectrum PRN code of SPT signal, including pilot tone PRN code and data PRN code are generated；
(2.2) complete 1 or complete -1 sequence of CW baseband signal are generated；
The length of CW is equal to NCWA chip width, base band are equivalent to the sequence { c of one complete 1 or complete -1CW,i, it can choose
cCW,i=1, i=0 ..., NCW-1；
(2.3) CW of SPT signal, pilot tone PRN code and data PRN code carry out the time-division, there is (NCW+Np+Nd)Tc=TSPT, SPT signal
Baseband representation sSPT(t) are as follows:
In formula, p (t) is that width is TcRectangular function, p (t) is defined as:
(2.4) the baseband representation s of SPT signalSPT(t) it is filtered through a symmetrical FIR low pass filter, sSPT(t) low pass
Filtering postscript is
6. a kind of communication means based on low rail moving communication satellite according to claim 5, it is characterised in that: the step
Suddenly (2.1) generate the spread spectrum PRN code of SPT signal, specifically:
PRN code rate is Rc, chip width is Tc=1/Rc, the bandwidth of PRN code signal is no more than BW-BWsubband, i.e. 2Rc≤BW-
BWsubband, pilot tone PRN code sequence { cp,iLength be NpA chip, the data PRN code sequence { c after modulating SPT signal textd,i}
Length is NdA chip.
7. a kind of communication means based on low rail moving communication satellite according to claim 3, it is characterised in that: described
SPT signal wide-band spread spectrum generates, and obtains by the following method:
(2.1) the spread spectrum PRN code of SPT signal, including pilot tone PRN code and data PRN code are generated；
PRN code rate is Rc, chip width is Tc=1/Rc；The bandwidth of PRN code signal is not more than BW-BWsubband, i.e. 2Rc≤BW-
BWsubband；Pilot tone PRN code sequence { cp,iLength be Np,dA chip, the data PRN code sequence { c after modulating SPT textd,iLong
Degree is Np,dA chip；
(2.2) complete 1 or complete -1 sequence of CW baseband signal are generated；
The length of CW is equal to NCWA chip width, base band are equivalent to the sequence { c of one complete 1 or complete -1CW,i, cCW,i=1, i=
0 ..., NCW-1；
(2.3) the pilot tone PRN code of SPT signal and data PRN code are located in quadrature branch, carry out the time-division with CW, there is (NCW+Np,d)
Tc=TSPT, the baseband representation s of SPT signalSPT(t) are as follows:
sSPT(t)=sSPT,I(t)+jsSPT,Q(t)
In formula, sSPT,IIt (t) is I tributary signal, sSPT,Q(t) it is Q tributary signal, respectively indicates are as follows:
(2.4) I tributary signal sSPT,I(t) and Q tributary signal sSPT,Q(t) it is filtered, filters through the same FIR low pass filter
Afterwards be respectivelyWithLow-pass filtering postscript is
8. a kind of communication means based on low rail moving communication satellite according to claim 3, it is characterised in that: described
Wave beam poll pattern is designed, is obtained by the following method:
(3.1) low rail moving communication satellite shares NbeamA wave beam, is equally divided into NGroupGroup, every group has N number of wave beam, N=Nbeam/
NGroup；In order to shorten the polling interval of SPT signal, while broadcasting NGroupA SPT signal, each SPT signal is in N number of wave beam
Carry out time-division poll；
(3.2) SPT signal is according to predetermined manner, the successively poll between N number of wave beam, wave beam poll pattern are as follows: wave beam 1, wave beam
2 ..., wave beam N, wave beam 1, wave beam 2 ..., wave beam N ...；
(3.3) from the point of view of a wave beam, every NTFTime broadcasts an a length of TSPTSPT signal frame, time domain duty ratio is
TSPT/(N·TF)。
9. a kind of communication means based on low rail moving communication satellite according to claim 3, it is characterised in that: described
Wave beam poll pattern is designed, is obtained by the following method:
(3.1) low rail moving communication satellite shares NbeamA wave beam, is equally divided into NGroupGroup, every group has N number of wave beam, N=Nbeam/
NGroup；In order to shorten the polling interval of SPT signal, while broadcasting NGroupA SPT signal, each SPT signal is in N number of wave beam
Carry out time-division poll；
(3.2) SPT signal is according to random fashion, the random time division poll between N number of wave beam；Wave beam poll pattern is by a pseudorandom
Number generator control, each SPT signal, pseudorandom number generator export the number n that N is arrived in 1beam；
(3.3) from the point of view of a wave beam, the interval that SPT signal occurs is to differ at random, is equivalent to characteristic when introducing jump.
10. a kind of communication means based on low rail moving communication satellite according to claim 3, it is characterised in that: described
Beam selection and SPT signal broadcast, obtain by the following method:
(4.1) according to wave beam poll pattern, selecting the wave beam for broadcasting SPT signal is wave beam nbeam；
(4.2) digital beam-forming DBF coefficient is adjusted, by SPT signal modulation to wave beam nbeam；
(4.3) it is successively broadcast after DAC, up-conversion, amplification through multibeam antenna.
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| CN111257911B (en) * | 2020-03-05 | 2022-08-12 | 西安空间无线电技术研究所 | Chip-level pulse time hopping navigation signal generation and broadcasting realization method based on digital beam forming |
| CN111464940A (en) * | 2020-04-14 | 2020-07-28 | 清华大学 | Method and system for scheduling communication-guide integrated constellation beams |
| CN111781621A (en) * | 2020-06-19 | 2020-10-16 | 西安空间无线电技术研究所 | Navigation method and system based on low-orbit broadband internet constellation |
| CN111781621B (en) * | 2020-06-19 | 2023-06-06 | 西安空间无线电技术研究所 | Navigation method and system based on low-orbit broadband Internet constellation |
| CN116980031A (en) * | 2023-09-25 | 2023-10-31 | 中国电子科技集团公司第五十四研究所 | Method for generating downlink spread spectrum signal of low-orbit satellite communication system |
| CN116980031B (en) * | 2023-09-25 | 2023-11-24 | 中国电子科技集团公司第五十四研究所 | Method for generating downlink spread spectrum signal of low-orbit satellite communication system |
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