CN103983943B - Digital satellite television timing system track measurement method - Google Patents
Digital satellite television timing system track measurement method Download PDFInfo
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- CN103983943B CN103983943B CN201410242671.9A CN201410242671A CN103983943B CN 103983943 B CN103983943 B CN 103983943B CN 201410242671 A CN201410242671 A CN 201410242671A CN 103983943 B CN103983943 B CN 103983943B
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- 238000012545 processing Methods 0.000 claims description 17
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- 239000005433 ionosphere Substances 0.000 claims description 3
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- 241001269238 Data Species 0.000 claims 1
- 230000002123 temporal effect Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 7
- 230000008054 signal transmission Effects 0.000 abstract description 2
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Classifications
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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
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/06—Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements
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- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The invention relates to a digital satellite television timing system track measurement method which includes the steps of ground station time premise synchronization, ascending ground Nanjing station A timestamp generation and timestamp inter cutting and ascending ground Nanjing station A timestamp generation and timestamp inter cutting. The satellite track measurement aim is achieved through an existing digital television system, the transmitting-receiving time of special identification bits in television signals is marked, signal transmission time delay is calculated, the one-transmitting multi-receiving track measurement mode is adopted, an equation set related to satellite coordinates is listed according to multiple time delay measurement values, and the satellite coordinates are obtained through calculation. Compared with a GNSS satellite navigation timing system, the digital satellite television timing system track measurement method has the advantages that the satellite television signals are high, and the anti-jamming capability is high; spite interference and attacks of GNSS signals are avoided.
Description
Technical field
The invention belongs to communication technical field is and in particular to arrive using digital satellite television signal to forwarding TV signal
The method that geostationary satellite carries out surveying rail.
Background technology
Digital satellite television high accuracy time service is to transmit split-second precision information using existing digital satellite television system
A kind of time service means.The exact position of accurate measurement and estimation satellite is most important to realizing high accuracy time service.How using electricity
It is to realize one of key issue of digital satellite television high accuracy time service depending on signal accurate measurement co-ordinates of satellite.
Appearance with standards for digital broadcasting and Technique Popularizing, anolog TV signals are gradually by digital satellite television signal
Replaced, signal system there occurs great change, the time service method of original simulated television can not be continuing with, original simulation
The time signal being carried in TV signal also terminates therewith.How to utilize existing digital satellite television system accurate measurement satellite
Coordinate is the technical problem of urgent need to resolve.
Content of the invention
The technical problem to be solved is to overcome the defect of prior art, provides a kind of signal strong, anti-interference
The strong digital satellite television time dissemination system Orbit determination of ability.
It is made up of following step to solve the technical scheme that adopted of above-mentioned technical problem：
(1) earth station's time precise synchronization
With up ground Nanjing station as A, ground receiver Xi'an station be designated as B, ground receiver Urumchi Station as C, ground connects
Receipts Station in Kunming is D, ground receiver Changchun Station is E, ground receiver Nanjing station is F, with daily morning 00:00 is initial time, adopts
Use two-way satellite time and frequency transfer method, surveyed A and B, the clock correction between C, D, E, F once every 1 minute, survey 100 daily altogether
Secondary, the clock correction formula and A station between is respectively at daily B, C, D, E, F station.
In formula, t is away from 00:The number of minutes when 00, aiFor the initial phase difference of i station atomic clock and A station atomic clock, biFor i station
The frequency deviation of atomic clock, ciStand for i the drift rate of atomic clock, i is followed successively by B, C, D, E, F grounded receiving station.
(2) up ground Nanjing station A timestamp is generated and is intercutted with timestamp
In the A TV up-link of up ground Nanjing station, the asynchronous serial interface of modulator takes out speed is 270,000,000 ratios
Special signal bit stream per second, completes synchronization to signal, generates nsec stamp and intercuts with timestamp.
(3) radio TV signals receiving and data processing
Ground receiver Xi'an station B, ground receiver Urumchi Station C, ground receiver Station in Kunming D, ground receiver Changchun Station E,
Ground receiver Nanjing station F receives satellite downlink TV signal, exports number by demodulated for the TV signal being received by network
According to processing server, data processing server carries out data processing to the data of input, obtains the position of satellite, specific as follows：
1) ground receiver Xi'an station B, ground receiver Urumchi Station C, ground receiver Station in Kunming D, ground receiver Changchun Station
E, ground receiver Nanjing station F receive the downstream signal from satellite, demodulated, output 270 MBPSs by satellite antenna
Asynchronous serial signal bit stream, carry out signal synchronizing process, carry out timestamp generating process and be transmitted across with up ground Nanjing station A
Journey is identical；Precise moments corresponding to the rising edge of the 7th to the 8th of synchronous head in transport stream packets are denoted as tr,
Encode, with corresponding program clock reference value, the timestamp generating the time of reception, be stored in the memory 1 of first in first out.
2) decoder in television system identifies transport stream packets by PID Packet Identifier for 0x120, and 0x120 is corresponding for demodulation
Transport stream packets data obtains the timestamp of delivery time generation.Using the program clock reference value in the timestamp of delivery time as
Keyword finds identical program clock reference in memory 1, carries out data processing.
Data processing step is as follows：Corresponding moment value is subtracted each other, obtains big ring time delay estimate.
Δt′i=tr-ts(3)
3) t is calculated by formula (2)rMoment clock correction Δ TAi(tr) revise, you can obtain accurately big ring time delay value
Δti=Δ t 'i+ΔTAi(tr) (4)
4) ground receiver Xi'an station B, ground receiver Urumchi Station C, ground receiver Station in Kunming D, ground receiver Changchun Station
Respective coordinate and surveyed time delay System to connecting station, are defended by E, ground receiver Nanjing station F by solving equation group (5)
The coordinate of star：
In formula, ρiFor c (Δ ti-τ′i), λ is c τclk,For Xi 2+Yi 2+Zi 2, i is B, C, D, E, F, time delay correction τ 'iLogical
Cross ionosphere and troposphere Mathematical Modeling obtains, as known parameters, i station coordinates (Xi,Yi,Zi) it is known that τclkIt is uplink time delay,
C is the light velocity.
The up ground Nanjing station A timestamp of the present invention generates and intercuts signal is completed in step (2) and be synchronously：
(1) signal is synchronous
1) clock recovery is synchronized by serial digital receiver, complete bit synchronization.
2) initial data after bit synchronization is sequentially placed into the shift register of 50, in 50 data of detection whether
Continuous two control character K28.5 are had to be 0011111010 or 1100000101, if having, using this coding as the number receiving
According to the border of code word section, data that will be later is classified as a byte every 10 bits, completes byte of sync, enters step 3)；
If no, repeat step 2).
3) each transport stream packets is the regular length of 188 bytes, and the sync byte in packet header is 0x47, corresponding 10 bits
Be encoded to 1110000101 or 0001110101, find a 0x47 code word, the code word being separated by 187 bytes be 0x47 it is believed that after
One 0x47 code word is the sync byte of transport stream packets, completes signal synchronous；Otherwise again find 0x47 code word.
Between the present invention, stamp intercuts step and is：
(1) by the frequency signal of the 10MHz frequency signal frequency multiplication of atomic clock to 200MHz, each clock cycle was 5 nanoseconds,
Counter N scope is 0～199999999, and Counter Value is started from scratch, and each cycle counter value adds 1, is added to
199999999, Counter Value zero setting, the counting cycle of counter is 1 second, and resolution ratio was 5 nanoseconds.
(2) extract the rising edge of the 7th to the 8th in the sync byte 0x47 of packet header, using this rising edge record
Value N of counter, the moment t corresponding to this transport stream packetssFor N × 5 (ns), this value is stored in register 1.
(3) extract the 5th byte after the sync byte 0x47 of packet header to the 11st byte, store to register 2.To register
In 2, data is converted to ASCII character, reverts to former transmission data, and the four figures evidence in register 2 is program clock reference value mark
Will position, if zero, return to step (2)；If 1, show that this transmission includes program clock reference, by the 2nd byte in register 2
T in the 7th byte data and register 1sCoding generates nsec stamp, and before ginseng timestamp, 6 bytes are examined for program clock
Value, 4 bytes are t afterwardss.
The insertion TV signal step of the timestamp of the present invention is：The PID Packet Identifier of television system encoder is set to
0x120, generates timestamp to step (2) and encodes, insert TV up-link, go upward to satellite together with programme information and turn
Send out device.
The present invention reaches, using existing digital television system, the purpose that satellite surveys rail.By marking special mark in TV signal
Know the transmitting-receiving time of position, calculate signal transmission delay.Using the survey board pattern of multicast, according to multiple delay measurements, arrange
Go out the equation group with regard to co-ordinates of satellite, be calculated co-ordinates of satellite.The present invention, compared with the satellite navigation time service systems such as GNSS, defends
Star TV signal has the advantages that signal is strong, strong antijamming capability, it is to avoid malicious interference and attack that GNSS signal is faced
Problem.
Brief description
Fig. 1 is the present invention up ground Nanjing station A and each earth station time synchronized flow chart.
Fig. 2 is the flow chart of the embodiment of the present invention 1.
Fig. 3 is the flow chart of up ground Nanjing station A in Fig. 2.
Fig. 4 is the flow chart that in Fig. 3, timestamp generates.
The flow chart of Tu5Shi Tu2Zhong earth station B～earth station F.
Apply example 1
The present embodiment digital satellite television time dissemination system Orbit determination step is as follows：
1st, earth station's time precise synchronization
In Fig. 1, with up ground Nanjing station as A, ground receiver Xi'an station be designated as B, ground receiver Urumchi Station as C,
Ground receiver Station in Kunming is D, ground receiver Changchun Station is E, ground receiver Nanjing station is F, with daily morning 00:00 when being initial
Between, using two-way satellite time and frequency transfer method, surveyed A and B, the clock correction between C, D, E, F once every 1 minute, daily altogether
Survey 100 times, be denoted as Δ T respectivelyAi(1)、ΔTAi(2)、...、ΔTAi(100), wherein i is respectively B, C, D, E, F.Solution such as ShiShimonoseki
In ai,bi,ciSystem of linear equations：
Equation group left end coefficient matrix is a symmetric positive definite matrix, existence and unique solution, obtains daily B, C, D, E, F station point
The clock correction formula and A station between is not：
In formula, t is away from 00:The number of minutes when 00, aiFor the initial phase difference of i station atomic clock and A station atomic clock, biFor i station
The frequency deviation of atomic clock, ciStand for i the drift rate of atomic clock, i is followed successively by B, C, D, E, F grounded receiving station.
2nd, up ground Nanjing station A timestamp is generated and is intercutted with timestamp
In fig. 2, in the A TV up-link of up ground Nanjing station, the asynchronous serial interface taking-up speed of modulator is
The signal bit stream of 270 MBPSs, completes synchronization to signal, generates nsec stamp, and inserts in TV signal, with electricity
Depending on signal uplink to satellite repeater.
The flow chart that Fig. 3 gives up ground Nanjing station A.In figure 3, the present embodiment signal is completed synchronous such as
Under：
(1) signal is synchronous
1) clock recovery is synchronized by serial digital receiver, complete bit synchronization.
2) initial data after bit synchronization is sequentially placed into the shift register of 50, in 50 data of detection whether
Continuous two control character K28.5 are had to be 0011111010 or 1100000101, if having, using this coding as the number receiving
According to the border of code word section, data that will be later is classified as a byte every 10 bits, completes byte of sync, enters step 3)；
If no, repeat step 2).
3) each transport stream packets is the regular length of 188 bytes, and the sync byte in packet header is 0x47, corresponding 10 bits
It is encoded to " 1110000101 " or " 0001110101 ", find a 0x47 code word, the code word being separated by 187 bytes is 0x47, recognizes
It is the sync byte of transport stream packets for a rear 0x47 code word, complete signal synchronous；Otherwise again find 0x47 code word.
(2) nsec stamp generation method was intercutted with the time
The production method of timestamp is as shown in figure 4, concretely comprise the following steps：
1) by the frequency signal of the 10MHz frequency signal frequency multiplication of atomic clock to 200MHz, each clock cycle was 5 nanoseconds,
Counter N scope is 0～199999999, and Counter Value is started from scratch, and each cycle counter value adds 1, is added to
199999999, Counter Value zero setting, the counting cycle of counter is 1 second, and resolution ratio was 5 nanoseconds.
2) extract the rising edge of the 7th to the 8th in the sync byte 0x47 of packet header, using this rising edge recording gauge
Value N of number device.Moment t corresponding to this transport stream packetssFor N × 5 nanosecond.This value is stored in register 1.
3) extract the 5th byte after the sync byte 0x47 of packet header to the 11st byte, store to register 2.To register 2
Middle data is converted to ASCII character, reverts to former transmission data.Four figures evidence in register 2 is program clock reference value mark
Will position, if zero, return the step 2 in (2))；If 1, show that this transmission includes program clock reference, by register 2
T in 2nd byte to the 7th byte data and register 1sCoding generates nsec stamp, and before ginseng timestamp, 6 bytes are program
Value examined by clock, and 4 bytes are t afterwardss.
Intercutting of timestamp is as described below：
The PID Packet Identifier of television system encoder is set to 0x120, timestamp is generated to step (2) and encodes, insertion
TV up-link, goes upward to satellite repeater together with programme information.
3. radio TV signals receiving and data processing
In fig. 2, ground receiver Xi'an station B, ground receiver Urumchi Station C, ground receiver Station in Kunming D, ground receiver
Changchun Station E, ground receiver Nanjing station F receive satellite downlink TV signal, by demodulated for the TV signal being received by network
Export data processing server, data processing server carries out data processing to the data of input, obtains the position of satellite.Tool
Body is as described below：
(1) in Figure 5, ground receiver Xi'an station B, ground receiver Urumchi Station C, ground receiver Station in Kunming D, ground connect
Receive Changchun Station E, ground receiver Nanjing station F and receive the downstream signal being derived from satellite, demodulated, output 270,000,000 by satellite antenna
The asynchronous serial signal bit stream of bits per second, carries out signal synchronizing process, carries out timestamp generating process and up ground Nanjing
A transmission process of standing is identical.During by accurate corresponding to the rising edge of the 7th to the 8th of synchronous head in transport stream packets
Engrave and make tr, encode, with corresponding program clock reference value, the timestamp generating the time of reception, be stored in the memory 1 of first in first out
In.
(2) decoder in television system identifies transport stream packets by PID Packet Identifier for 0x120, and demodulation 0x120 corresponds to
Transport stream packets data obtain delivery time generation timestamp.Program clock reference value in the timestamp of delivery time is made
Find identical program clock reference for keyword in memory 1, carry out data processing.
Data processing step is as follows：Corresponding moment value is subtracted each other, obtains big ring time delay estimate.
Δt′i=tr-ts(3)
(3) t is calculated by formula (2)rMoment clock correction Δ TAi(tr) revise, you can obtain accurately big ring time delay value
Δti=Δ t 'i+ΔTAi(tr) (4)
(4) ground receiver Xi'an station B, ground receiver Urumchi Station C, ground receiver Station in Kunming D, ground receiver Changchun Station
E, ground receiver Nanjing station F by respective coordinate and surveyed time delay System to connecting station, by solving equation group (5)
Coordinate to satellite.
In formula, ρiFor c (Δ ti-τ′i), λ is c τclk,For Xi 2+Yi 2+Zi 2, i is B, C, D, E, F, time delay correction τ 'iLogical
Cross ionosphere and troposphere Mathematical Modeling obtains, as known parameters, i station coordinates (Xi,Yi,Zi) it is known that τclkIt is uplink time delay,
C is the light velocity.
Claims (1)
1. a kind of digital satellite television time dissemination system Orbit determination is it is characterised in that it is made up of following step：
(1) earth station's time precise synchronization
With up ground Nanjing station as A, ground receiver Xi'an station be designated as B, ground receiver Urumchi Station as C, ground receiver elder brother
Bright stand for D, ground receiver Changchun Station be E, ground receiver Nanjing station be F, with daily morning 00:00 is initial time, using defending
Star two-way temporal frequency transmission method, surveyed A and B, the clock correction between C, D, E, F once every 1 minute, daily survey 100 times altogether, often
Clock correction formula and A station between is respectively at its B, C, D, E, F station：
In formula, t is away from 00:The number of minutes when 00, aiFor the initial phase difference of i station atomic clock and A station atomic clock, biFor i station atom
The frequency deviation of clock, ciStand for i the drift rate of atomic clock, i is followed successively by B, C, D, E, F grounded receiving station；
(2) up ground Nanjing station A timestamp is generated and is intercutted with timestamp
In the A TV up-link of up ground Nanjing station, the asynchronous serial interface of modulator takes out speed for 270 megabits often
The signal bit stream of second, completes synchronization to signal, generates nsec stamp and intercuts with timestamp；
Above-mentioned signal is completed synchronous be：
1) clock recovery is synchronized by serial digital receiver, complete bit synchronization；
2) initial data after bit synchronization is sequentially placed into the shift register of 50, whether has even in 50 data of detection
Two continuous control character K28.5 are encoded to 0011111010 or 1100000101, if having, using this coding as the number receiving
According to the border of code word section, data that will be later is classified as a byte every 10 bits, completes byte of sync, enters step 3)；
If no, repeat step 2)；
3) each transport stream packets is the regular length of 188 bytes, and the sync byte in packet header is 0x47, corresponding 10 bits of encoded
For 1110000101 or 0001110101, find a 0x47 code word, the code word being separated by 187 bytes is 0x47 it is believed that latter one
0x47 code word is the sync byte of transport stream packets, completes signal synchronous；Otherwise again find 0x47 code word；
Above-mentioned nsec stamp generation method is intercutted step with timestamp and is：
1) by the frequency signal of the 10MHz frequency signal frequency multiplication of atomic clock to 200MHz, each clock cycle was 5 nanoseconds, counted
Device count value N scope is 0～199999999, and Counter Value is started from scratch, and each cycle counter value adds 1, is added to
199999999, Counter Value zero setting, the counting cycle of counter is 1 second, and resolution ratio was 5 nanoseconds；
2) extract the rising edge of the 7th to the 8th in the sync byte 0x47 of packet header, using this rising edge recording counter
Value N, the moment t corresponding to this transport stream packetssFor N × 5 nanosecond, this value is stored in register 1；
3) extract the 5th byte after the sync byte 0x47 of packet header to the 11st byte, store to register 2；To number in register 2
According to being converted to ASCII character, revert to former transmission data, the four figures evidence in register 2 is program clock reference value flag bit,
If zero, return to step 2)；If 1, show that this transport stream packets contains program clock reference, by the 2nd byte in register 2 to
T in 7 byte datas and register 1sCoding generates nsec stamp, and before timestamp, 6 bytes are program clock reference value, after
4 bytes are ts；
The insertion TV signal step of described timestamp is：The PID Packet Identifier of television system encoder is set to 0x120, to step
Rapid 2) generate timestamp and are encoded, and insert TV up-link, go upward to satellite repeater together with programme information；
(3) radio TV signals receiving and data processing
Ground receiver Xi'an station B, ground receiver Urumchi Station C, ground receiver Station in Kunming D, ground receiver Changchun Station E, ground
Receive Nanjing station F and receive satellite downlink TV signal, exported demodulated for the TV signal being received at data by network
Reason server, data processing server carries out data processing to the data of input, obtains the position of satellite, specific as follows：
1) ground receiver Xi'an station B, ground receiver Urumchi Station C, ground receiver Station in Kunming D, ground receiver Changchun Station E,
Face reception Nanjing station F receives the downstream signal from satellite by satellite antenna, demodulated, output 270 MBPSs different
Step serial bit stream signal, carries out signal synchronizing process, carries out timestamp generating process complete with up ground Nanjing station A transmission process
Exactly the same；Precise moments corresponding to the rising edge of the 7th to the 8th of synchronous head in transport stream packets are denoted as tr, and right
The program clock reference value coding answered generates the timestamp of the time of reception, is stored in the memory 1 of first in first out；
2) decoder in television system identifies transport stream packets by PID Packet Identifier 0x120, demodulates the corresponding transport stream of 0x120
Bag data obtains the timestamp of delivery time generation, using the program clock reference value in the timestamp of delivery time as keyword
Find identical program clock reference in memory 1, carry out data processing；
Data processing step is as follows：Corresponding moment value is subtracted each other, obtains big ring time delay estimate；
Δt′i=tr-ts(3)
3) t is calculated by formula (2)rMoment clock correction Δ TAi(tr) revise, you can obtain accurately big ring time delay value
Δti=Δ t 'i+ΔTAi(tr) (4)
4) ground receiver Xi'an station B, ground receiver Urumchi Station C, ground receiver Station in Kunming D, ground receiver Changchun Station E,
Respective coordinate and surveyed time delay System to connecting station, are obtained satellite by solving equation group (5) by face reception Nanjing station F
Coordinate：
In formula, ρiFor c (Δ ti-τi'), λ is c τclk,ForWherein i is A, B, C, D, E, time delay correction τ 'iLogical
Cross ionosphere and troposphere Mathematical Modeling obtains, as known parameters, i station coordinates (Xi,Yi,Zi) it is known that τclkIt is uplink time delay,
C is the light velocity.
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