CN109743075A - A kind of non-homogeneous frequency spreading tracking loop synchronizing device and method of tricyclic linkage - Google Patents
A kind of non-homogeneous frequency spreading tracking loop synchronizing device and method of tricyclic linkage Download PDFInfo
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Abstract
The invention belongs to simultaneous techniques field is tracked in spread spectrum communication, and in particular to a kind of non-homogeneous frequency spreading tracking loop synchronizing device and method of tricyclic linkage.Apparatus of the present invention include carrier tracking loop, frequency spreading tracking ring and bit tracking ring.The present invention increases bit track loop on the basis of conventional phase locked loops, code ring, obtains bit jump information using the correlation value calculation bit phase position of anticipating signal and delay signal by removing signal carrier and spreading code, determines the position of integral cleaning.The present invention tracks signal by the way of tricyclic linkage, information clock and synchronous tracking problem under the special spread spectrum system that spreading code clock is not homologous, spreading ratio is on-fixed constant can effectively be solved, it is portable strong, it is adapted to simultaneously relevant synchronous with the demodulation of incoherent spread spectrum, it is reliable and stable, and structure is simple and easy to implement, is especially suitable for that satellite communication, bandwidth is fixed and the variable signal synchronized tracking of data rate in telemetry system.
Description
Technical field
The invention belongs to simultaneous techniques field is tracked in spread spectrum communication, and in particular to a kind of non-homogeneous spread spectrum of tricyclic linkage
Code tracking loop synchronizing device and method.
Background technique
Spread spectrum communication is widely used in military communication and civil confidential communication.It is according to data bit clock and pseudo-code clock
It is no homologous, Direct Sequence Spread Spectrum DSSS signal can be divided into relevant DSSS and incoherent DSSS, incoherent DSSS, that is, non-homogeneous
DSSS.Relevant DSSS signal puppet bit rate is the integral multiple of data symbol rate, utilizes carrier tracking loop and code tracking loop
It can synchronize.According to relevant DSSS technology, once frequency expansion sequence is detected by unauthorized user, the data symbols of authorized user
Other side is easily to crack.
And in incoherent DSSS signal, data clock and ranging code clock use non-homogeneous clock, due to clock stability
Difference, data rate can be changed in a certain range, spreading ratio be non-integer even non-constant, at this time the hopping edge of data bit with
The relationship of determination is not present in pseudo-code phase.Noise is closer to using the signal after incoherent spread spectrum, it is more difficult to be trapped, resist
The property decoded is high.But simultaneously because more this uncertain variables of bit start-phase, increase Receiver Complexity, using tradition
Relevant Spectrum Spread Tracking method can not determine that loop integral removes interval and integral removes initial position, cannot also meet synchronous
It needs.
Synchronization to incoherent spread-spectrum signal includes two processes: capture and tracking.The effect of capture is to complete spreading code
The rough estimate of phase and Doppler frequency, that is, it is thick synchronous.The effect of tracking is to guarantee that local signal is synchronous with signal is received
State keeps locking, that is, essence to synchronize.For information clock and spreading code clock, not homologous, spreading ratio is the special of non-integer
System, PMF-FFT acquisition algorithm can effectively meet the capture demand of the incoherent spread-spectrum signal of high dynamic.But conventional track loop without
Method correctly locks incoherent spread-spectrum signal, thus the present invention provide a kind of bit ring, spreading code ring, the linkage of carrier wave ring tricyclic with
Track synchronizing device.
Summary of the invention
The present invention is based on software radio frameworks, and it is an object of the invention to different with spreading code clock for information clock
Source, the application scenario that spreading ratio is non-integer provide the non-homogeneous frequency spreading tracking synchronizing device and method of a kind of tricyclic linkage,
On the basis of conventional code ring and carrier wave ring, bit tracking ring is increased, non-homogeneous spreading code is realized by the linkage of tricyclic
Tracking；Simultaneously it is suitable for the tracking of relevant spreading code.
The object of the present invention is achieved like this:
A kind of non-homogeneous frequency spreading tracking loop synchronizing device of tricyclic linkage, including carrier tracking loop 1, frequency spreading tracking
Ring 2, bit track ring 3, and the carrier tracking loop 1 generates unit 101, carrier wave discriminator 102 and carrier wave ring by local carrier
Path filter 103 forms, and wherein local carrier generates unit 101 and generates advanced E, lag L, tri- tunnel instant P according to different delay
Carrier wave, carrier tracking loop 1 generate the local replica signal and the reading of signal-obtaining unit 301 that unit 101 generates according to local carrier
The reception signal taken does coherent integration removing carrier wave, is then fed into spreading code stripping unit 202 and removes spreading code, it is clear to obtain integral
Division result selects the integral of different branch to remove result and is sent into carrier wave discriminator 102, and handles by the carrier wave discriminator of configuration
To carrier phase error identification result, carrier phase error identification result is sent into the filtering of carrier loop filter 103 and is carried
Wave track loop carrier frequency feedback control amount guarantees carrier phase lock to control local carrier and generate unit 101；It is described
Frequency spreading tracking ring 2 by local spreading code generate unit 201, spreading code stripping unit 202, spreading code discriminator 203 and expand
Frequency code loop filter 204 forms, wherein local spreading code, which generates unit 201, generates advanced P, lag L, i.e. according to different delay
When tri- tunnel spread-spectrum code signals of E, local spreading code generates the signal after the local spreading code that unit 201 generates and removing carrier wave
It does coherent integration and is sent into the removing spreading code of spreading code stripping unit 202, the integral of different lead-lag branches is removed result and sent
Enter spreading code discriminator 203, handles to obtain spread spectrum code phase error identification result by the spreading code discriminator of configuration, by spreading code
Phase error identification result is sent into the filtering of spreading code loop filter 204 and obtains frequency spreading tracking loop feedback control amount, thus
It controls local spreading code generation unit 201 and guarantees local spreading code PGC demodulation；Frequency spreading tracking ring 2 is according to the code phase captured
Position setting initial value simultaneously guarantees that spreading code is correct in signal according to the continuous grey iterative generation local spreading code reference signal of loop feedback
Removing；The bit tracking ring 3 is by signal-obtaining unit 301, spreading code stripping unit 302, bit discriminator 303 and bit
Loop filter 304 forms, and reception signal and local carrier that signal-obtaining unit 301 is read are generated what unit 101 generated
Local carrier, local spreading code generate the local spreading code that unit 201 generates and do coherent integration removing carrier wave and spreading code, at this time
Integral is removed in result and only jumps information comprising data bit, and integral removes the jump of section bit in spreading code stripping unit 302
More early, integral result is smaller, and integral is removed the result feeding progress of bit discriminator 303 bit phase and identifies to obtain bit phase
Error identification result, the filtering processing then through bit loop filter 304 calculate corresponding bit jump phase, control letter
Number reading unit 301 completes bit synchronous after loop-locking so that controlling integral removes interval and position.
A kind of non-homogeneous frequency spreading tracking loop synchronous method of tricyclic linkage, comprising the following steps:
Step 1: the parameters such as initialization local carrier frequency, spread spectrum code frequency, bit rate；
Step 2: the treated length for receiving signal is determined according to bit rate, the reception read advanced P, lag L and instant E
Signal generates local advanced, lag and instant spreading code, and wherein frequency spreading tracking ring 2 tracks the advanced, stagnant of ring 3 with bit
Time delay width is not identical afterwards, generates local carrier and bit tracking ring 3 is advanced, the corresponding local carrier of lagging phase；
Step 3: in frequency spreading tracking ring 2, take instant reception signal and instant local carrier, respectively with it is advanced, stagnant
Afterwards, the local spreading code of three branches enters spreading code stripping unit 202 and does correlation immediately, and integral is stand-by after removing；Bit tracking
In ring 3, take advanced, lag receive signal respectively in advance, the local spreading code of lag enters spreading code stripping unit 302 and does phase
It closes, integral is stand-by after removing；
Step 4: in carrier tracking loop 1, by identification method set by carrier wave discriminator 102, corresponding integral being taken to remove
As a result phase detector error is calculated, updates local carrier frequency after carrier loop filter 103；In frequency spreading tracking ring 2, press
Identification method set by spreading code discriminator 203 takes corresponding integral to remove result and calculates phase detector error, by spreading code
Local spread spectrum code frequency is updated after loop filter 204；In bit track loop, by identification set by bit discriminator 303
Mode takes corresponding integral to remove result and calculates phase detector error, updates bit rate after bit loop filter 304；
Step 5: step 2,3,4 continuous iteration, through tracking lock after a period of time, for normal data demodulation.
Carrier tracking loop 1 assists tracking by the way of 3 rank phaselocked loops using 2 rank frequency locking ring, and the type of phase discriminator is arc tangent
Discriminator, expression formula are as follows:
In formula, QPIt removes for the sub- branch integral of multicarrier orthogonal of the instant branch of spreading code stripping unit 202 as a result, IPTo expand
The carrier wave of the instant branch of frequency code stripping unit 202 removes result with mutually sub- branch integral.
The discriminator that frequency spreading tracking ring 2 uses are as follows:
In formula, dDLLFor it is advanced with it is instant, immediately with the spread symbols width of lag, IE202 surpass for spreading code stripping unit
The carrier wave of preceding branch is removed with mutually sub- branch integral as a result, QEFor multicarrier orthogonal of the advanced branch of spreading code stripping unit 202
Branch integral is removed as a result, ILThe carrier wave for lagging branch for spreading code stripping unit 202 is removed with mutually sub- branch integral as a result, QL
Result is removed for the sub- branch integral of multicarrier orthogonal that spreading code stripping unit 202 lags branch.
Bit tracks the discriminator that ring 3 uses are as follows:
In formula, dBLLFor it is advanced with it is instant, immediately with the bit symbol width of lag, BLL, that is, Bit Phase Lock
Loop, bit_IEIt is removed with mutually sub- branch integral as a result, bit_Q for the carrier wave of the advanced branch of spreading code stripping unit 302ETo expand
The sub- branch integral of the multicarrier orthogonal of the advanced branch of frequency code stripping unit 302 is removed as a result, bit_ILFor spreading code stripping unit 302
The carrier wave for lagging branch is removed with mutually sub- branch integral as a result, bit_QLThe carrier wave of branch is lagged for spreading code stripping unit 302
Positive jiao zi branch integral removes result.
Compared with prior art, the beneficial effects of the present invention are:
1. the present invention is using tracking signal by the way of tricyclic linkage, additional increased bit track ring can solution by no means
Homologous spread-spectrum signal spreading ratio non-integer and the stability difference bring stationary problem in different clocks source.
2. it is of the invention portable strong, while it is synchronous with the demodulation of incoherent spread spectrum to be adapted to be concerned with, it is reliable and stable.
3. the configuration of the present invention is simple, it is easy to accomplish.
Detailed description of the invention
Fig. 1 is that non-homogeneous spread-spectrum signal constitutes schematic diagram；
Fig. 2 is the synchronous flow chart of non-homogeneous spread spectrum system；
Fig. 3 is tricyclic linkage tracking device functional block diagram；
Fig. 4 is the tracking output that non-homogeneous signal is tracked using typical loop；
Fig. 5 is that the present invention exports the tracking of non-homogeneous signal.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing and example, to this
Invention is further elaborated.It should be appreciated that this embodiment is only used to explain the present invention, it is not used to limit this hair
It is bright.
Under non-homogeneous spread spectrum system, as shown in figure 1 shown in a, bit hopping edge is not aligned usually with the spreading code period.Such as
In Fig. 1 shown in b, c, spreading ratio is non-integer, and in the poor situation of clock stability, spreading ratio is not even Fixed constant,
Therefore conventional tracking is unable to steady lock.For non-spread spectrum system, process capture can be synchronized as shown in Figure 2, with
Track.Capture is exactly slightly to synchronize, after the estimated value that Doppler and spread spectrum code phase are successfully obtained by PMF-FFT algorithm, for tracking
Loop settings initial value enters tricyclic linkage tracking process by the principle of the invention, and track loop functional block diagram is as shown in Figure 3.
A kind of non-homogeneous frequency spreading tracking loop synchronizing device of tricyclic linkage includes carrier tracking loop 1, frequency spreading tracking
Ring 2, bit track ring 3.
The carrier tracking loop 1 generates unit 101, carrier wave discriminator 102 and carrier loop filter by local carrier
103 compositions.Carrier tracking loop 1 is according to the Doppler frequency setting initial value captured and according to the continuous grey iterative generation sheet of loop feedback
Ground carrier reference signal is removed for carrier wave.Wherein local carrier generate unit 101 can be generated according to different delay advanced P,
Lag L and instant E three-channel carrier, the interval of delay are set as dBLL, BLL refers to Bit Phase Lock Loop；
The frequency spreading tracking ring 2 generates unit 201, spreading code stripping unit 202, spreading code by local spreading code and reflects
Other device 203 and spreading code loop filter 204 form.Frequency spreading tracking ring 2 is according to the code phase setting initial value and root captured
It is removed according to the continuous grey iterative generation local spreading code reference signal of loop feedback for spreading code.Wherein local spreading code generates unit
201 can generate advanced P, lag L and tri- tunnel spread-spectrum code signals of instant E according to different delay, and the interval of delay is set as dDLL；
The described bit tracking ring 3 by signal-obtaining unit 301, spreading code stripping unit 302, bit discriminator 303 and
Bit loop filter 304 forms.Bit tracks ring 3 after carrier wave removing and spreading code removing, only jumps comprising data bit
Become information.Integral removing section bit jump is more early in spreading code stripping unit 302, and integral result is smaller.It is corresponded to by calculating
Bit jump phase, control signal-obtaining unit 301, so that controlling integral removes interval and position, complete after loop-locking
Bit synchronous.Wherein signal-obtaining unit 301 can read advanced P, lag L and tri- road signal of instant E according to different delay, prolong
When interval be set as dBLL；
If received IF signal are as follows:
In formula, P is signal power, and D is data bit, and PN is frequency expansion sequence, tk=k/fsFor sampled point, fsFor sampling frequency
Rate, τ are spreading code phase delay, ωIFor IF frequency, ωdFor Doppler frequency,For carrier wave first phase, n is interchannel noise；
According to the following principle of each loop, tricyclic linkage tracking process can carry out according to the following steps:
Step 1, after success to be captured, initialization local carrier frequency is capture carrier frequency, spread spectrum code frequency is nominal
Bit rate, local spreading code first phase are capture code phase, bit rate is nominal data rate；
Step 2, the treated length for receiving signal is determined according to bit rate, reads advanced, lag and instant reception letter
Number.Local advanced, lag and instant spreading code are generated, wherein advanced, the lag of frequency spreading tracking ring 2 and bit tracking ring 3
Time delay width is not identical, and local spreading code time delay width is dDLLChip, bit loop time delay width are dBLLBit is actually being adopted
In the generating process of sampling point, bit loop time delay width should also be controlled by code circle filtering result, guarantee that spreading code de-spreads effect.It is raw
Advanced, the corresponding local carrier of lagging phase at local carrier and bit tracking ring 3；
Step 3, in frequency spreading tracking ring 2, instant reception signal and instant local carrier are taken, respectively with it is advanced, stagnant
Afterwards, the local spreading code of three branches enters spreading code stripping unit 202 and does correlation immediately, and integral is stand-by after removing.Bit tracking
In ring 3, take advanced, lag receive signal respectively in advance, the local spreading code of lag enters spreading code stripping unit 302 and does phase
It closes, integral is stand-by after removing.Wherein each branch integral removes result are as follows:
In formula, A is related peak-to-peak amplitude, and R is spreading code correlation function, feFor tracking frequency error, TcohWhen for coherent integration
Between,To track phase error, b is bit error；
Step 4, in carrier tracking loop 1, by identification method set by carrier wave discriminator 102, corresponding integral is taken to remove
As a result phase detector error is calculated, local carrier frequency may be updated after loop filter 103.In frequency spreading tracking ring 2, by expansion
Identification method set by frequency code discriminator 203 takes corresponding integral to remove result and calculates phase detector error, by loop filtering
Local spread spectrum code frequency may be updated after device 204.In bit track loop, by identification method set by bit discriminator 303, take
Corresponding integral removes result and calculates phase detector error, and bit rate may be updated after loop filter 304.
Wherein, carrier tracking loop 1 assists tracking by the way of 3 rank phaselocked loops using 2 rank frequency locking ring, and the type of phase discriminator is anti-
Tangent discriminator, expression formula are as follows:
In formula, QPResult is removed for the sub- branch integral of multicarrier orthogonal of the instant branch of spreading code stripping unit 202.IPTo expand
The carrier wave of the instant branch of frequency code stripping unit 202 removes result with mutually sub- branch integral；
Wherein, the discriminator that frequency spreading tracking ring 2 uses are as follows:
In formula, dDLLFor it is advanced with it is instant, immediately with the spread symbols width of lag.IE202 surpass for spreading code stripping unit
The carrier wave of preceding branch removes result with mutually sub- branch integral.QEFor multicarrier orthogonal of the advanced branch of spreading code stripping unit 202
Branch integral removes result.ILThe carrier wave for lagging branch for spreading code stripping unit 202 removes result with mutually sub- branch integral.QL
Result is removed for the sub- branch integral of multicarrier orthogonal that spreading code stripping unit 202 lags branch；
Wherein, the discriminator that bit tracking ring 3 uses are as follows:
In formula, bit_IEResult is removed with mutually sub- branch integral for the carrier wave of the advanced branch of spreading code stripping unit 302.
bit_QEResult is removed for the sub- branch integral of multicarrier orthogonal of the advanced branch of spreading code stripping unit 302.bit_ILFor spreading code stripping
Result is removed with mutually sub- branch integral from the carrier wave that unit 302 lags branch.bit_QLBranch is lagged for spreading code stripping unit 302
The sub- branch integral of the multicarrier orthogonal on road removes result；
Step 2,3,4 continuous iteration, are tracked i.e. lockable after a period of time, for normal data demodulation.
Embodiment:
By taking the demodulation of an incoherent spread spectrum communication system as an example, systematic data symbols rate is 16KHz, spread-spectrum code rate
For 9.6Mcps, spreading code a length of 1023, channel carrier-to-noise ratio C/N0For 50dB, Doppler shift is between ± 36KHz.Fig. 1 is non-
Homologous spread-spectrum signal constitutes schematic diagram, and Fig. 2 is the synchronous flow chart of non-homogeneous spread spectrum system, and Fig. 3 is that tricyclic linkage track loop is former
Block diagram is managed, Fig. 4 is to only use carrier wave ring using conventional tracking and tracked with code ring, it is seen that loop can not normally be locked
It is fixed.Fig. 5 is tracking result after applying the present invention, it is seen that track loop can be locked normally, and each loop error is in controlled range
It is interior.
Claims (5)
1. a kind of non-homogeneous frequency spreading tracking loop synchronizing device of tricyclic linkage, including carrier tracking loop (1), frequency spreading tracking
Ring (2), bit tracking ring (3), it is characterised in that: the carrier tracking loop (1) generates unit (101) by local carrier, carries
Wave discriminator (102) and carrier loop filter (103) composition, wherein local carrier generates unit (101) according to different delay
Advanced E, lag L, instant P three-channel carrier are generated, carrier tracking loop (1) generates the sheet that unit (101) generate according to local carrier
The reception signal that ground replica signal and signal-obtaining unit (301) are read does coherent integration removing carrier wave, is then fed into spreading code
Stripping unit (202) removes spreading code, obtains integral and removes as a result, the integral of selection different branch, which removes result, is sent into carrier wave mirror
Other device (102), and handle to obtain carrier phase error identification result by the carrier wave discriminator of configuration, carrier phase error is identified
As a result it is sent into carrier loop filter (103) filtering and obtains carrier tracking loop carrier frequency feedback control amount, to control this
Ground carrier-generation unit (101) guarantees carrier phase lock；The frequency spreading tracking ring (2) generates unit by local spreading code
(201), spreading code stripping unit (202), spreading code discriminator (203) and spreading code loop filter (204) composition, wherein originally
Ground spreading code generates unit (201) and generates advanced P, lag L, tri- tunnel spread-spectrum code signals of instant E according to different delay, locally
Spreading code generates the local spreading code that unit (201) generate and does coherent integration feeding spreading code removing with the signal after removing carrier wave
Unit (202) removes spreading code, and the integral of different lead-lag branches removes result and is sent into spreading code discriminator (203), presses
The spreading code discriminator of configuration handles to obtain spread spectrum code phase error identification result, and spread spectrum code phase error identification result is sent into
Spreading code loop filter (204) filtering obtains frequency spreading tracking loop feedback control amount, generates to control local spreading code
Unit (201) guarantees local spreading code PGC demodulation；Frequency spreading tracking ring (2) is according to the code phase setting initial value and root captured
Guarantee that spreading code is correctly removed in signal according to the continuous grey iterative generation local spreading code reference signal of loop feedback；The bit
Ring (3) are tracked to be filtered by signal-obtaining unit (301), spreading code stripping unit (302), bit discriminator (303) and bit loop
Wave device (304) composition, the reception signal and local carrier that signal-obtaining unit (301) are read generate unit (101) generation
Local carrier, local spreading code generate the local spreading code that unit (201) generate and do coherent integration removing carrier wave and spreading code, this
Shi Jifen is removed in result and is only jumped information comprising data bit, and integral removes section bit in spreading code stripping unit (302)
Jump is more early, and integral result is smaller, and integral removing result feeding bit discriminator (303) progress bit phase is identified and is compared
Special phase error identification result, the filtering processing then through bit loop filter (304) calculate corresponding bit jump phase
Position controls signal-obtaining unit (301), so that controlling integral removes interval and position, completes bit synchronous after loop-locking.
2. a kind of non-homogeneous frequency spreading tracking loop synchronous method of tricyclic linkage, which comprises the following steps:
Step 1: the parameters such as initialization local carrier frequency, spread spectrum code frequency, bit rate；
Step 2: the treated length for receiving signal is determined according to bit rate, the reception letter for reading advanced P, lagging L and instant E
Number, generate local advanced, lag and instant spreading code, wherein frequency spreading tracking ring (2) and bit tracking ring (3) it is advanced,
It is not identical to lag time delay width, generates local carrier and bit tracking ring (3) is advanced, the corresponding local carrier of lagging phase；
Step 3: in frequency spreading tracking ring (2), take instant reception signal and instant local carrier, respectively in advance, lag,
The local spreading code of instant three branch enters spreading code stripping unit (202) and does correlation, and integral is stand-by after removing；Bit tracks ring
(3) in, take advanced, lag receive signal respectively in advance, the local spreading code of lag enters spreading code stripping unit (302) and does
Correlation, integral are stand-by after removing；
Step 4: in carrier tracking loop (1), by identification method set by carrier wave discriminator (102), corresponding integral being taken to remove
As a result phase detector error is calculated, updates local carrier frequency after carrier loop filter (103)；Frequency spreading tracking ring (2)
In, by identification method set by spreading code discriminator (203), takes corresponding integral to remove result and calculate phase detector error, warp
It crosses spreading code loop filter (204) and updates local spread spectrum code frequency afterwards；Bit tracks in ring (3), by bit discriminator (303)
Set identification method takes corresponding integral to remove result and calculates phase detector error, after bit loop filter (304)
Update bit rate；
Step 5: step 2,3,4 continuous iteration, through tracking lock after a period of time, for normal data demodulation.
3. a kind of non-homogeneous frequency spreading tracking loop synchronous method of tricyclic linkage according to claim 2, feature exist
In: carrier tracking loop (1) assists tracking by the way of 3 rank phaselocked loops using 2 rank frequency locking ring, and the type of phase discriminator is arc tangent identification
Device, expression formula are as follows:
In formula, QPIt removes for the sub- branch integral of multicarrier orthogonal of the instant branch of spreading code stripping unit (202) as a result, IPFor spread spectrum
The carrier wave of the instant branch of code stripping unit (202) removes result with mutually sub- branch integral.
4. a kind of non-homogeneous frequency spreading tracking loop synchronous method of tricyclic linkage according to claim 2, feature exist
In the discriminator that frequency spreading tracking ring (2) uses are as follows:
In formula, dDLLFor it is advanced with it is instant, immediately with the spread symbols width of lag, IEIt is advanced for spreading code stripping unit (202)
The carrier wave of branch is removed with mutually sub- branch integral as a result, QEFor multicarrier orthogonal of the advanced branch of spreading code stripping unit (202)
Branch integral is removed as a result, ILFor spreading code stripping unit (202) lag branch carrier wave with mutually sub- branch integral removing as a result,
QLResult is removed for the sub- branch integral of multicarrier orthogonal that spreading code stripping unit (202) lag branch.
5. a kind of non-homogeneous frequency spreading tracking loop synchronous method of tricyclic linkage according to claim 2, feature exist
In bit tracks the discriminator that ring (3) use are as follows:
In formula, dBLLFor it is advanced with it is instant, immediately with the bit symbol width of lag, BLL, that is, Bit Phase Lock Loop,
bit_IECarrier wave for the advanced branch of spreading code stripping unit (302) is removed with mutually sub- branch integral as a result, bit_QEFor spreading code
The sub- branch integral of the multicarrier orthogonal of the advanced branch of stripping unit (302) is removed as a result, bit_ILFor spreading code stripping unit (302)
The carrier wave for lagging branch is removed with mutually sub- branch integral as a result, bit_QLThe load of branch is lagged for spreading code stripping unit (302)
The positive jiao zi branch integral of wave removes result.
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| CN112118200B (en) * | 2020-09-07 | 2023-03-31 | 北京航宇星通科技有限公司 | Tracking method and system |
| CN112769537A (en) * | 2020-12-14 | 2021-05-07 | 北京无线电计量测试研究所 | Satellite bidirectional time comparison data transmission signal demodulation device, system and method |
| CN112769537B (en) * | 2020-12-14 | 2023-05-16 | 北京无线电计量测试研究所 | Satellite bidirectional time comparison data transmission signal demodulation device, system and method |
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