CN108055058A - The high-precision measuring method of carrier doppler and its change rate - Google Patents
The high-precision measuring method of carrier doppler and its change rate Download PDFInfo
- Publication number
- CN108055058A CN108055058A CN201711173235.0A CN201711173235A CN108055058A CN 108055058 A CN108055058 A CN 108055058A CN 201711173235 A CN201711173235 A CN 201711173235A CN 108055058 A CN108055058 A CN 108055058A
- Authority
- CN
- China
- Prior art keywords
- frequency
- doppler
- carrier
- unit
- rate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7075—Synchronisation aspects with code phase acquisition
- H04B1/70751—Synchronisation aspects with code phase acquisition using partial detection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7085—Synchronisation aspects using a code tracking loop, e.g. a delay-locked loop
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The invention discloses a kind of carrier doppler and its high-precision measuring methods of change rate.A kind of high certainty of measurement is intended to provide, the high-precision measuring method of frequency search time can be shortened.The technical scheme is that：The measurement procedure of carrier doppler and its change rate is divided into bigness scale frequency, an accurate measurement frequency, three states of secondary fine frequency measurement, carrier doppler and its change rate compensating unit using dual compensation of the carrier doppler, doppler changing rate of main control unit to sampled data completion carrier doppler and its change rate by main control unit；Sampled data after frequency compensation sequentially passes through pattern-recognition and completes carrier auxiliary and FFT computings with control unit, frequency senser, peak search element and frequency solving unit；Obtain an accurate measurement value of carrier doppler and doppler changing rate；Secondary fine frequency measurement state repeats the operating process of last accurate measurement frequency state, so as to obtain carrier doppler, doppler changing rate and search time information.
Description
Technical field
The invention belongs to wireless communication technology field, it is related to the high-acruracy survey side of a kind of carrier doppler and its change rate
Method.
Technical background
Signal is received under high dynamic environment and contains larger Doppler frequency and its change rate, since signal dynamics are high,
Linear FM signal cannot can be regarded as in the usual short time, estimates it carrier wave as simple signal in acquisition procedure
The parameters such as Doppler frequency, frequency change rate.The carrier wave of Doppler with the carrier wave received is inconsistent will weaken behind code ring
Coherent integration amplitude.Conventional carrier tracking is difficult to obtain preferable compromise in high dynamic stress and two aspect of tracking accuracy.It is high
The key of dynamic weak signal capture is the estimation to carrier signal Doppler and doppler changing rate.High dynamic weak signal environment
Higher requirement is proposed to the reliability of receiver.Traditional carrier wave ring includes phaselocked loop and frequency locking ring.The base region of the two
It is not the difference of discriminator and thus generates corresponding property difference.In the larger Doppler shift of the amplitude of processing, if
Do not increase loop bandwidth, Doppler frequency shift can make carrier wave beyond the capture frequency band of phaselocked loop；And the increase of loop bandwidth will draw
Entering more noises causes the reduction of accuracy, when introduce noise level near or above loop threshold voltage when, will cause
Losing lock；Doppler shift larger to change rate simultaneously, the response speed of phaselocked loop can not be kept up with.Due to sampling rate usually very
Height, the data rate caused after sampling is very high, and it is difficult to keep up with or cause unnecessary waste to make subsequent processing speed.Especially
It is for some synchronous demodulation algorithm complexities are higher, calculation amount is larger, and in the case where meeting system real time requirement, data handles up
Rate cannot be too high, it is therefore desirable to carry out reduction of speed to data.Phaselocked loop can be than relatively closely tracking letter using relatively narrow noise bandwidth
The carrier-phase measurement of number output is quite accurate, and the data bit errors rate that demodulates is relatively low however it should to dynamic
The tolerance of power is poor.When the stronger or required loop bandwidth of noise is wider, phaselocked loop is possible to signal lock fixed output quota
It is raw difficult.Frequency locking ring is good using wider noise bandwidth dynamic property, can more robustly tolerate the high dynamic stress of user and penetrate
Frequently, the interference such as multipath and ionospheric scintillation can track the lower signal of signal-to-noise ratio, and also more unwise to data bit saltus step
Sense, however it slightly owes close to the tracking of signal, loop noise is higher, and the carrier-phase measurement of output owes accurate, and number
It is also higher according to the bit error rate occurred in demodulating process.Phaselocked loop under frequency locking ring auxiliary is a kind of fairly common combination
Scheme frequency locking ring therein and phaselocked loop are run simultaneously.Because the frequency difference signal that frequency locking ring wave filter is exported is integrated
The phase difference that phase locked loop filter is exported could be become afterwards.In band spread receiver, in order to allow track loop can successfully with
Track receives signal, and the carrier frequency of band spread receiver inside institute initial replication must coincide to a certain extent with receiving signal, no
Then, if replica signal and the frequency error received between signal are more than that track loop being led into scope, the usual nothing of track loop
Method enters lock.Therefore spread spectrum receiver chance carries out signal capture before commencing signal tracking, and the carrier wave for estimating reception signal is more
The rough estimate value of general Le, but under high dynamic small-signal scene, the carrier doppler rough estimate that signal capture estimates
Value and the general error of strangling of true carrier wave are larger, and reception signal is there are larger doppler changing rate, track loop can not quickly and
Steadily enter lock, in order to which solve that high dynamic small-signal scene brings influences, it is necessary to further improve the essence of carrier doppler
Degree.
In traditional measurement method, measurement subsystem docking is collected mail number carry out down-sampled processing after, first to sampled data into
The rough frequency measurement processing of row, then carries out fine frequency measurement processing to sampled data.In order to improve carrier doppler, doppler changing rate
Measurement accuracy, bigness scale frequency and the accurate measurement frequency stage need to open carrier doppler, doppler changing rate more frequency slots, pole
The earth extends search time, can not meet requirement of the system to time of measuring；In order to reach requirement of the system to time of measuring,
The frequency slot number that carrier doppler, doppler changing rate are opened is limited, this will reduce carrier doppler, Doppler's variation
The measurement accuracy of rate.Therefore, this processing mode can not improve simultaneously carrier doppler, doppler changing rate measurement accuracy and
Shorten its search time.
The content of the invention
In order to overcome the drawbacks described above of traditional measurement method, the present invention provides a kind of high certainty of measurement, can shorten frequency
The carrier doppler of search time and its high-precision measuring method of change rate.
The above-mentioned purpose of the present invention can be achieved by scheme introduced below, a kind of carrier doppler and its change rate
High-precision measuring method, comprise the following steps：
In band spread receiver measuring system, the enabling signal of upper layer software (applications) is transferred to the master control list that initialization unit is connected
The measurement procedure of carrier doppler and its change rate is divided into bigness scale frequency, accurate measurement frequency, a secondary fine frequency measurement by member, main control unit
Three states, and according to the information rate of signal and carrier doppler scope is received, the control down-sampled unit of the first order is to receiving
Signal completes the down-sampled processing of the first order；In bigness scale frequency state, carrier doppler and its change rate compensating unit are using each frequency
Carrier doppler, the local complex carrier of doppler changing rate generation of rate slot, are stored in first order storage after down-sampled to the first order
Sampled data in unit completes the dual compensation of carrier doppler, doppler changing rate；Hits after frequency compensation
According to pattern-recognition is sequentially passed through carrier doppler is obtained with control unit, frequency senser, peak search element, frequency solving unit
With the bigness scale value of doppler changing rate；In an accurate measurement frequency state, carrier doppler and its change rate compensating unit are first with bigness scale
The local complex carrier of bigness scale value generation of frequency state, the sampled data in above-mentioned first order storage unit is mended into line frequency in advance
It repays, down-sampled treated the sampled data in the down-sampled unit second level in the second level is stored in second level storage unit, then basis
The bigness scale value of bigness scale frequency state is subdivided into multiple frequency slots, and frequency compensation is carried out to the sampled data in the storage unit of the second level,
Sampled data after frequency compensation sequentially passes through pattern-recognition and control unit, frequency senser, peak search element and frequency
Rate solving unit obtains an accurate measurement value of carrier doppler and doppler changing rate；Secondary fine frequency measurement state repeats last essence
The operating process of frequency measurement state, so as to obtain carrier doppler, doppler changing rate and search time information.
The present invention has the advantages that compared with traditional measurement method：
High certainty of measurement.Accurate measurement frequency state is divided into an accurate measurement frequency state and secondary fine frequency measurement state by the present invention, using upper one
The metrical information of frequency measurement state pre-compensates for the sampled data of first order storage unit into line frequency, the load that signal capture estimates
Ripple Doppler rough estimate value and the general Le error of true carrier wave are small, and the down-sampled unit of the first order is according to the information rate for receiving signal
The down-sampled processing of the first order is completed with the docking collection of letters number of carrier doppler scope；After the down-sampled unit in the second level pre-compensates for frequency
Sampled data complete the down-sampled processing in the second level；It can further improve the measurement essence of carrier doppler and doppler changing rate
Degree；The defects of locking can not usually be entered by overcoming prior art track loop.
The frequency search time can be shortened.The present invention is pre-compensated in accurate measurement frequency state advance line frequency, shortens single frequency
The processing time of slot, in high dynamic (maximum Doppler change rate ± 15kHz/s) and small-signal (carrier-to-noise ratio 40dB) environment,
Accurate measurement frequency advance line frequency pre-compensates for and two-wheeled accurate measurement frequency, measures the measurement accuracy of carrier doppler and its change rate, passes through mould
Formula identifies extensive to the signal completion carrier wave after frequency compensation according to the frequency measurement state of main control unit with control unit and frequency senser
Multiple and fast Fourier transform FFT computings；Peak search element and frequency solving unit carry out FFT operation results peak value judgement and look for
To the frequency slots corresponding to peak-peak and peak value, the search for completing carrier doppler and its change rate resolves.Shorten frequency
Search time.The search time of carrier doppler and doppler changing rate can be further reduced, compared with traditional measurement method,
In the case where not increasing hardware resource cost, carrier doppler can further improve.
Description of the drawings
Fig. 1 is measuring system structure diagram of the present invention.
Fig. 2 is the ID integration filter principle schematics of the down-sampled unit of the first order.
Fig. 3 is the local complex carrier generation principle schematic of carrier doppler and its change rate compensating unit.
Fig. 4 is the principle schematic diagram of pattern-recognition and control unit.
Fig. 5 is current measurement subsystem structure diagram.
Invention is further illustrated with reference to the accompanying drawings and examples.
Specific embodiment
Refering to Fig. 1.According to the present invention, in band spread receiver measuring system, the enabling signal of upper layer software (applications) is transferred to
The measurement procedure of carrier doppler and its change rate is divided into bigness scale by the main control unit that initialization unit is connected, main control unit
Frequently, three accurate measurement frequency, secondary fine frequency measurement states；In bigness scale frequency state, the down-sampled unit of the first order is according to reception signal
The down-sampled processing of the first order is completed in information rate and the docking collection of letters number of carrier doppler scope；In bigness scale frequency state, how general carrier wave is
It strangles and its change rate compensating unit generates local complex carrier using carrier doppler, the doppler changing rate of each frequency slots,
Sampled data after down-sampled to the first order in frequency deposit first order storage unit completes carrier doppler, doppler changing rate
Dual compensation；Sampled data after frequency compensation sequentially passes through pattern-recognition and control unit, frequency senser, peak value searching
Unit, frequency solving unit obtain the bigness scale value of carrier doppler and doppler changing rate；In an accurate measurement frequency state, carrier wave is more
General Le and its change rate compensating unit store the above-mentioned first order first with the local complex carrier of bigness scale value generation of bigness scale frequency state
Sampled data in unit is pre-compensated for into line frequency, by down-sampled treated the sampled data in the down-sampled unit second level in the second level
Second level storage unit is stored in, multiple frequency slots are then subdivided into according to the bigness scale value of bigness scale frequency state, the second level is stored single
Sampled data in member carries out frequency compensation, and it is single with control that the sampled data after frequency compensation sequentially passes through pattern-recognition
Member, frequency senser, peak search element and frequency solving unit obtain an accurate measurement of carrier doppler and doppler changing rate
Value；Secondary fine frequency measurement state repeats the operating process of last accurate measurement frequency state, so as to obtain carrier doppler, Doppler's variation
Rate and search time information.
In bigness scale frequency state, the signal after frequency compensation is divided at single frequency mode by pattern-recognition with control unit
Reason completes carrier auxiliary according to the frequency measurement state of main control unit to the signal after frequency compensation；Frequency senser is according to main control unit
Frequency measurement state to FFT computings points configure, to after carrier auxiliary signal complete FFT computings；Peak search element pair
The fast Fourier transform FFT operation results of frequency senser output carry out peak value judgement, find corresponding to peak-peak and peak value
Frequency slots, complete receive signal frequency search；It is more that frequency slots of the frequency computing unit according to corresponding to peak value complete carrier wave
The search of general Le and its change rate resolves, and obtains carrier doppler, doppler changing rate and search time information；In an accurate measurement
Frequency and secondary fine frequency measurement state, pattern-recognition and control unit are according to receiving the modulation type of signal by biphase phase shift keying BPSK
Signal is divided into two overtone modes, by double bpsk QPSK, SQPSK staggered quadriphase shift keying SQPSK, double Binary Phase Shift keys
Control tri- kinds of modulated signals of QPSK are divided into quadruple pattern；Carrier auxiliary is completed to the signal after frequency compensation.
Measurement subsystem comprises the following steps：
In step 1 the down-sampled unit of the first order according to receive signal information rate and carrier doppler scope docking collect mail number into
Row down-sampled processing for the first time, and will it is down-sampled for the first time after sampled data deposit first order storage unit；
Main control unit is according to the carrier doppler of required search, the multiple frequencies of range subdivision of doppler changing rate in step 2
Slot, carrier doppler and its change rate compensating unit generate this using carrier doppler, the doppler changing rate of each frequency slots
Ground complex carrier completes sampled data the dual compensation of carrier doppler, doppler changing rate.
Carrier doppler and its change rate compensation described in step 2 complete sampled data carrier doppler, Doppler becomes
The dual compensation of rate.Main control unit is multiple according to the range subdivision of the carrier doppler of required search, doppler changing rate
Frequency slots can be calculated by following formula according to the carrier doppler of each frequency slots, doppler changing rate and obtain carrier doppler control
Word KfAnd doppler changing rate control word Kr,
Kf=fdop/fs·232
Kr=fr/fs 2·232
Wherein, fdoplFor the carrier doppler that current frequency slot needs compensate, frThe Doppler compensated for current frequency slot needs
Change rate, fsIt is to need frequency compensated signal sampling frequencies；
Carrier doppler and its change rate compensating unit store the first order using the metrical information of upper frequency measurement state in step 3
The sampled data of unit is pre-compensated for into line frequency, and the down-sampled unit in the second level is according to the frequency measurement state of main control unit to frequency compensation
Signal afterwards carries out second of down-sampled processing, and second of sampled data after down-sampled is stored in second level storage unit；
Down-sampled processing described in step 1 and step 3 uses ID integration filter structures.The ID integration filters mainly include
Two parts of DDS and integrate-dump, integration frequencies control word is determined according to the frequency measurement state of main control unit, and clearing is generated by DDS
Pulse carries out input data integrate-dump operation to complete ID integral filterings, finally send integral filtering data single to storage
Member.Carrier doppler and its change rate compensating unit are led to respectively using carrier doppler control word and doppler changing rate control word
Cross address of cache and table look-up and generate two-way local carrier, local complex carrier is generated by multiple multiplication, then sampled data and
Local complex carrier carries out multiple multiplication, completes the dual compensation of the carrier doppler to sampled data, doppler changing rate.
The whole flow process of main control unit is divided into three states such as bigness scale frequency, accurate measurement frequency, a secondary fine frequency measurement in step 4,
In bigness scale frequency state, the signal after frequency compensation is divided into single frequency mode with control unit and handled by pattern-recognition；One
Secondary accurate measurement frequency and secondary fine frequency measurement state, after pattern-recognition and control unit are according to the modulation type of signal is received to frequency compensation
Signal complete carrier auxiliary, wherein bpsk signal is divided into two overtone modes, QPSK, SQPSK, UQPSK signal are divided
For quadruple pattern；
Pattern-recognition and control unit described in step 4 is true according to the modulation type of the frequency measurement state of main control unit and reception signal
Determine state of a control.In bigness scale frequency state, reception signal is divided into single frequency mode and is handled；In accurate measurement frequency state, according to connecing
The modulation type collected mail number completes the carrier auxiliary of signal, will wherein be divided into two overtone modes by bpsk signal, by QPSK,
SQPSK, UQPSK signal are divided into quadruple pattern；
Frequency senser configures FFT computings points according to the frequency measurement state of main control unit in step 5, and to carrier auxiliary after
Signal complete FFT computings, pattern-recognition is complete to signal after frequency compensation according to the frequency measurement state of main control unit with control unit
Into carrier auxiliary, the FFT operation results that peak search element exports frequency senser carry out peak value judgement, find peak-peak with
And the frequency slots corresponding to peak value, it completes to receive the frequency search of signal, frequency of the frequency computing unit according to corresponding to peak value
Slot completes signal carrier Doppler and its search of change rate resolves, and obtains carrier doppler, doppler changing rate, search time
Etc. information.
Frequency measurement computing described in step 5 configures FFT computings points according to the frequency measurement state of main control unit.In bigness scale
Frequency state and an accurate measurement frequency state are counted using 2048 computings；In secondary fine frequency measurement state, counted using 4096 computings, most
FFT computings are completed to the signal after carrier auxiliary afterwards.
Whole flow process described in entire step is divided into three states such as bigness scale frequency, accurate measurement frequency, a secondary fine frequency measurement.Thick
Frequency measurement state, according to the multiple frequency slots of the range subdivision of the carrier doppler of required search, doppler changing rate, to the first order
Sampled data in storage unit carries out frequency compensation, resolved by pattern-recognition and control, frequency measurement, peak value searching, frequency etc.
Unit obtains the bigness scale value of carrier doppler and doppler changing rate；In an accurate measurement frequency state, carrier doppler and its variation
Rate compensating unit is first with the local complex carrier of bigness scale value generation of bigness scale frequency state, to the sampled data in first order storage unit
It is pre-compensated for into line frequency, second level storage unit is stored in after the down-sampled cell processing in the second level, then according to bigness scale frequency shape
The bigness scale value of state segments multiple frequency slots, carries out frequency compensation to the sampled data in the storage unit of the second level, knows by pattern
An accurate measurement of carrier doppler and doppler changing rate is not obtained with units such as control, frequency measurement, peak value searching, frequency resolvings
Value；Secondary fine frequency measurement state is repeated once the operating process of accurate measurement frequency state, so as to obtain carrier doppler, Doppler's variation
The information such as rate, search time.
If reception signal is bpsk signal, information rate Rb=1kbps, system clock fclk=90MHz, receives signal
Carrier doppler scope fdopl=± 100kHz, doppler changing rate scope frate=± 15kHz/s, the down-sampled clock of the first order
fsample=256kHz receives the sampling time t of signals=0.512s.
In bigness scale frequency state, for main control unit using carrier doppler as zero, initial Doppler change rate is zero, and Doppler becomes
Rate step-size in search is slotted for 250Hz/s, and carrier doppler and doppler changing rate are subdivided into 60 frequency slots altogether,
Refering to Fig. 2.In order to adapt to receive the information rate and carrier doppler of signal, down-sampled clock fsample=256kHz, is examined
Consider small-signal scene, set the carrier-to-noise ratio for receiving signal as 40dB, receive signal at this time and be submerged in ambient noise completely
In, the repressed carrier wave of signal is received in order to detect, the down-sampled unit of the first order need to increase integration increasing by extending the time of integration
Benefit then sets the sampling time t for receiving signals=0.512s.
The down-sampled unit of the first order uses ID integration filters, and ID integration filters are mainly included and controlled using integration frequencies
Direct Digital Frequency Synthesizers DDS, the ID integration filter of word generation quenching pulse is down-sampled according to the down-sampled unit of the first order
Clock fsampleIntegration frequencies control word is generated, Direct Digital Frequency Synthesizers DDS resets arteries and veins using the generation of integration frequencies control word
Punching, constantly carries out input data with quenching pulse to integrate-clear operation, as sampling time tsTerminate when reaching 0.512s to
Level-one storage unit is stored in sampled data.
Local carrier generation unit generates local compound load according to carrier doppler, the doppler changing rate of each frequency slots
Ripple, carrier doppler and its change rate compensating unit using local complex carrier to the sampled data in first order storage unit into
Line frequency compensates, and reception signal is divided into single frequency mode with control unit and handled by pattern-recognition, by frequency senser, peak
The units such as value search unit, frequency resolving obtain the bigness scale value of carrier doppler, doppler changing rate, can be can be calculated by following formula
The search time t of bigness scale frequency statep1,
tp1=N1×(fsample×ts/fclk)=87.381ms
In an accurate measurement frequency state, carrier doppler and its change rate compensating unit are first generated with the bigness scale value of bigness scale frequency state
Local complex carrier, carrier doppler and its change rate compensating unit are using the local complex carrier in first order storage unit
Sampled data pre-compensated for into line frequency, ID integration filters exponent number selection 4 in the down-sampled unit in the second level will be by the second level
Down-sampled treated sampled data deposit second level storage unit；Then main control unit is using carrier doppler bigness scale value as carrier wave
Doppler, initial Doppler change rate are doppler changing rate bigness scale value, and doppler changing rate step-size in search is thin for 32.0Hz/s
Change carrier doppler and doppler changing rate, carrier doppler and its change rate are divided at least 100 frequency slots altogether, according to
The carrier doppler of each frequency slots, the local complex carrier of doppler changing rate generation, carrier doppler and its change rate compensation
Unit carries out the sampled data in the storage unit of the second level frequency compensation using local complex carrier, and pattern-recognition is single with control
Member will receive signal and be divided into two overtone modes completion carrier auxiliary, be obtained by units such as frequency measurement, peak value searching, frequency resolvings
Accurate measurement value of carrier doppler and doppler changing rate, main control unit can be calculated by following formula can an accurate measurement state search
Rope time tp2=fsample×ts/fclk+N2×(fsample/4×ts/fclk)=37.865ms
In secondary fine frequency measurement state, frequency precompensation is first completed with an accurate measurement value of an accurate measurement state, second level drop is adopted
ID integration filters exponent number selection 16 in sample unit will be deposited by down-sampled treated the sampled data deposit second level in the second level
Storage unit；Then for main control unit using accurate measurement value of carrier doppler as carrier doppler, how general initial Doppler change rate be
Accurate measurement value of change rate is strangled, doppler changing rate step-size in search refines carrier doppler and doppler changing rate for 4.0Hz/s,
Carrier doppler and its change rate are divided into 100 frequency slots altogether, other are repeated once the operating process of accurate measurement frequency state, main
Control unit can be can be calculated the search time t of secondary accurate measurement state by following formulap3,
tp3=fsample×ts/fclk+N3×(fsample/16×ts/fclk)=6.007ms
By bigness scale frequency, three states such as accurate measurement frequency, a secondary fine frequency measurement, it is how general that main control unit by following formula can be calculated carrier wave
Strangle precision fdopl_res, doppler changing rate precision frate_res, search time tp,
fdopl_res=fsample/ 16/2/FFT=1.953Hz
frate_res=4.0Hz/s
tp=tp1+tp2+tp3=131.253ms
Traditional measurement method can be calculated carrier doppler essence by bigness scale frequency and accurate measurement two states of frequency, main control unit by following formula
Spend fd'opl_res, doppler changing rate precision fr'ate_res, search time t'p,
fd'opl_res=fsample/ 4/2/FFT=15.625Hz
frate_res=32.0Hz/s
t'p=(N1+N2)×(fsample×ts/fclk)=233.017ms
As it can be seen that the method pre-compensated for using two-wheeled accurate measurement frequency method proposed by the present invention and accurate measurement frequency advance line frequency, is given
In high dynamic (maximum Doppler change rate ± 15kHz/s) and small-signal (carrier-to-noise ratio 40dB) environment, carrier doppler and its
The feasible program of change rate measuring method,, can be into the case where not increasing hardware resource cost compared with traditional measurement method
One step improve carrier doppler, doppler changing rate measurement accuracy and shorten its search time.
Refering to Fig. 3.Carrier doppler and its change rate compensating unit include the local complex carrier being connected with control unit
Generation unit.In order to dock collect mail number dual compensation for completing carrier doppler, doppler changing rate, carrier doppler and its a change
The local complex carrier generation unit of rate compensating unit is needed the carrier doppler of required search, doppler changing rate
How general the multiple frequency slots of range subdivision, main control unit be according to the carrier wave of each subdivision thereof slot of local complex carrier generation unit
Le, doppler changing rate can be calculated by following formula and generate carrier doppler control word and doppler changing rate control word KfAnd Doppler
Change rate control word Kr,
Kf=fdop/fs·232
Kr=fr/fs 2·232
Wherein, fdoplFor the carrier doppler that current frequency slot needs compensate, frThe Doppler compensated for current frequency slot needs
Change rate, fsIt is to need frequency compensated signal sampling frequencies；
The carrier doppler control word K that local complex carrier generation unit is generated according to main control unit is obtainedf, by once integrating
After computing, by address of cache and sine table is looked into, generates local carrier Doppler carrier all the way；By doppler changing rate control word
KrBy address of cache and sine table is looked into after integral operation twice, generates another way local doppler changing rate carrier wave；Two
Road doppler changing rate carrier wave, which answers multiplication by being combined multiplier, can generate local complex carrier.Carrier doppler and
Sampled data and local complex carrier are carried out multiple multiplication by its change rate compensating unit, complete to adopt the down-sampled unit in the second level
The dual compensation of the carrier doppler, doppler changing rate of sample data.
Refering to Fig. 4.Signal can be divided into different moulds by pattern-recognition from control unit according to the modulation type for receiving signal
Formula completes carrier auxiliary.Single-frequency mould is first pressed by carrier doppler and its frequency compensated sampled data of change rate compensating unit
Formula, two overtone modes, quadruple pattern carry out completing carrier auxiliary, and main control unit is according to frequency measurement model selection carrier auxiliary mould
Biphase phase shift keying bpsk signal wherein in an accurate measurement frequency and secondary fine frequency measurement state, is divided into two overtone modes by formula, will
Double bpsk QPSK, SQPSK staggered quadriphase shift keying SQPSK, double bpsk, tri- kinds of modulated signal divisions of QPSK
For quadruple pattern；Sampled data after carrier auxiliary is inputted into frequency senser.
Claims (10)
1. the high-precision measuring method of a kind of carrier doppler and its change rate, it is characterised in that comprise the following steps：
In band spread receiver measuring system, the enabling signal of upper layer software (applications) is transferred to the master control list that initialization unit is connected
The measurement procedure of carrier doppler and its change rate is divided into bigness scale frequency, accurate measurement frequency, a secondary fine frequency measurement by member, main control unit
Three states, and according to the information rate of signal and carrier doppler scope is received, the control down-sampled unit of the first order is to receiving
Signal completes the down-sampled processing of the first order；In bigness scale frequency state, carrier doppler and its change rate compensating unit are using each frequency
Carrier doppler, the local complex carrier of doppler changing rate generation of rate slot, are stored in first order storage after down-sampled to the first order
Sampled data in unit completes the dual compensation of carrier doppler, doppler changing rate；Hits after frequency compensation
According to pattern-recognition is sequentially passed through carrier doppler is obtained with control unit, frequency senser, peak search element, frequency solving unit
With the bigness scale value of doppler changing rate；In an accurate measurement frequency state, carrier doppler and its change rate compensating unit are first with bigness scale
The local complex carrier of bigness scale value generation of frequency state, the sampled data in above-mentioned first order storage unit is mended into line frequency in advance
It repays, down-sampled treated the sampled data in the down-sampled unit second level in the second level is stored in second level storage unit, then basis
The bigness scale value of bigness scale frequency state is subdivided into multiple frequency slots, and frequency compensation is carried out to the sampled data in the storage unit of the second level,
Sampled data after frequency compensation sequentially passes through pattern-recognition and control unit, frequency senser, peak search element and frequency
Rate solving unit obtains an accurate measurement value of carrier doppler and doppler changing rate；Secondary fine frequency measurement state repeats last essence
The operating process of frequency measurement state, so as to obtain carrier doppler, doppler changing rate and search time information.
2. the high-precision measuring method of carrier doppler as described in claim 1 and its change rate, it is characterised in that：In bigness scale
Signal after frequency compensation is divided into single frequency mode with control unit and handled by frequency state, pattern-recognition, according to master control list
The frequency measurement state of member completes carrier auxiliary to the signal after frequency compensation；Frequency senser is according to the frequency measurement state of main control unit to fast
Fast Fourier transform FFT computings points are configured, and FFT computings are completed to the signal after carrier auxiliary.
3. the high-precision measuring method of carrier doppler as claimed in claim 2 and its change rate, it is characterised in that：Peak value is searched
Cable elements carry out peak value judgement to the fast Fourier transform FFT operation results that frequency senser exports, and find peak-peak and peak
The corresponding frequency slots of value are completed to receive the frequency search of signal；Frequency slots of the frequency computing unit according to corresponding to peak value are complete
Search into carrier doppler and its change rate resolves, and obtains carrier doppler, doppler changing rate and search time information.
4. the high-precision measuring method of carrier doppler as described in claim 1 and its change rate, it is characterised in that：Once
Accurate measurement frequency and secondary fine frequency measurement state, pattern-recognition and control unit are according to the modulation type for receiving signal, by two-phase phase shift key
Control bpsk signal is divided into two overtone modes, by double bpsk QPSK, SQPSK staggered quadriphase shift keying SQPSK, double two-phases
Phase-shift keying (PSK), tri- kinds of modulated signals of QPSK are divided into quadruple pattern；Carrier auxiliary is completed to the signal after frequency compensation.
5. the high-precision measuring method of carrier doppler as described in claim 1 and its change rate, it is characterised in that：The first order
Down-sampled unit carries out a down-sampled place for the first time according to information rate and carrier doppler scope the docking collection of letters number for receiving signal
Reason, and will for the first time it is down-sampled after sampled data deposit first order storage unit；Main control unit is according to the load of required search
Ripple Doppler, the multiple frequency slots of the range subdivision of doppler changing rate, carrier doppler and its change rate compensating unit are using every
The carrier dopplers of a frequency slots, the local complex carrier of doppler changing rate generation complete sampled data carrier doppler, more
The general dual compensation for strangling change rate.
6. the high-precision measuring method of carrier doppler as described in claim 1 and its change rate, it is characterised in that：Carrier wave is more
General Le and its change rate compensating unit using upper frequency measurement state metrical information to the sampled data of first order storage unit into
Line frequency pre-compensates for, and the down-sampled unit in the second level carries out second according to the frequency measurement state of main control unit to the signal after frequency compensation
Secondary down-sampled processing, and second of sampled data after down-sampled is stored in second level storage unit.
7. the high-precision measuring method of carrier doppler as described in claim 1 and its change rate, it is characterised in that：Peak value is searched
The FFT operation results that cable elements export frequency senser carry out peak value judgement, find peak-peak and the frequency corresponding to peak value
Rate slot is completed to receive the frequency search of signal, and it is more that frequency slots of the frequency computing unit according to corresponding to peak value complete signal carrier
The search of general Le and its change rate resolves, and obtains carrier doppler, doppler changing rate and search time information.
8. the high-precision measuring method of carrier doppler as described in claim 1 and its change rate, it is characterised in that：The first order
Down-sampled unit uses ID integration filters, and ID integration filters mainly include and generate quenching pulse using integration frequencies control word
Direct Digital Frequency Synthesizers DDS, ID integration filter according to the down-sampled clock f of the down-sampled unit of the first ordersampleGeneration product
Crossover rate control word, Direct Digital Frequency Synthesizers DDS generate quenching pulse using integration frequencies control word, with quenching pulse not
It is disconnected that input data is carried out to integrate-clear operation, as sampling time tsTerminate to deposit to the first order storage unit when reaching 0.512s
Enter sampled data.
9. the high-precision measuring method of carrier doppler as described in claim 1 and its change rate, it is characterised in that：Master control list
Member is calculated by following formula according to carrier doppler, the doppler changing rate of each frequency slots and obtains carrier doppler control word KfIt is and more
General Le change rate control word Kr,
Kf=fdop/fs·232
Kr=fr/fs 2·232
Wherein, fdoplFor the carrier doppler that current frequency slot needs compensate, frThe Doppler compensated for current frequency slot needs becomes
Rate, fsIt is to need frequency compensated signal sampling frequencies.
10. the high-precision measuring method of carrier doppler as described in claim 1 and its change rate, it is characterised in that：Carrier wave
Doppler and its change rate compensating unit include the local complex carrier generation unit being connected with control unit, main control unit according to
The carrier doppler of required search, the multiple frequency slots of the range subdivision of doppler changing rate, main control unit is according to local compound
Carrier doppler, the doppler changing rate of each subdivision thereof slot of carrier-generation unit can be calculated by following formula generates carrier doppler
Control word KfAnd doppler changing rate control word Kr,
Kf=fdop/fs·232
Kr=fr/fs 2·232
Wherein, fdoplFor the carrier doppler that current frequency slot needs compensate, frThe Doppler compensated for current frequency slot needs becomes
Rate, fsIt is to need frequency compensated signal sampling frequencies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711173235.0A CN108055058B (en) | 2017-11-22 | 2017-11-22 | High-precision measurement method for carrier Doppler and change rate thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711173235.0A CN108055058B (en) | 2017-11-22 | 2017-11-22 | High-precision measurement method for carrier Doppler and change rate thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108055058A true CN108055058A (en) | 2018-05-18 |
| CN108055058B CN108055058B (en) | 2020-04-28 |
Family
ID=62119041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711173235.0A Active CN108055058B (en) | 2017-11-22 | 2017-11-22 | High-precision measurement method for carrier Doppler and change rate thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108055058B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108900452A (en) * | 2018-05-25 | 2018-11-27 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Reduce the synchronization detecting method of frequency window |
| CN109495410A (en) * | 2018-09-28 | 2019-03-19 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | High dynamic PCM/FM signal(-) carrier frequency precise Estimation Method |
| CN110138436A (en) * | 2019-02-15 | 2019-08-16 | 北京空间飞行器总体设计部 | A kind of each stage link receiver calculation method of parameters of soft lunar landing detection mission |
| CN110401611A (en) * | 2019-06-29 | 2019-11-01 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | The quickly method of detection CPFSK signal |
| CN110417697A (en) * | 2019-06-29 | 2019-11-05 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | The accurate frequency measuring method of the faint mpsk signal of high dynamic |
| CN111352124A (en) * | 2018-12-21 | 2020-06-30 | 余姚舜宇智能光学技术有限公司 | Doppler signal demodulation method and system thereof |
| CN111624402A (en) * | 2020-05-31 | 2020-09-04 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Method for accurately estimating carrier frequency of weak PM signal |
| CN111884984A (en) * | 2020-06-29 | 2020-11-03 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Fast carrier Doppler frequency shift capturing system |
| CN112968850A (en) * | 2021-02-10 | 2021-06-15 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Weak BPSK signal carrier capturing method |
| CN114553260A (en) * | 2022-02-17 | 2022-05-27 | 中国电子科技集团公司第十研究所 | High-precision measurement system for DS/FH spread spectrum signal carrier frequency |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6331836B1 (en) * | 2000-08-24 | 2001-12-18 | Fast Location.Net, Llc | Method and apparatus for rapidly estimating the doppler-error and other receiver frequency errors of global positioning system satellite signals weakened by obstructions in the signal path |
| CN101408604A (en) * | 2007-10-11 | 2009-04-15 | 联发科技股份有限公司 | Method and correlator for searching doppler frequency in gnss receiver |
| CN102394672A (en) * | 2011-10-12 | 2012-03-28 | 中国电子科技集团公司第十研究所 | Frequency tracking method of discontinuous carrier phase signals |
| CN103078660A (en) * | 2013-01-06 | 2013-05-01 | 中国电子科技集团公司第十研究所 | Method for reducing capturing time of spreading code in large dynamic range |
| CN104485976A (en) * | 2014-12-11 | 2015-04-01 | 中国工程物理研究院电子工程研究所 | High-dynamic weak-compounding code spread spectrum signal fast capturing method |
-
2017
- 2017-11-22 CN CN201711173235.0A patent/CN108055058B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6331836B1 (en) * | 2000-08-24 | 2001-12-18 | Fast Location.Net, Llc | Method and apparatus for rapidly estimating the doppler-error and other receiver frequency errors of global positioning system satellite signals weakened by obstructions in the signal path |
| CN101408604A (en) * | 2007-10-11 | 2009-04-15 | 联发科技股份有限公司 | Method and correlator for searching doppler frequency in gnss receiver |
| CN102394672A (en) * | 2011-10-12 | 2012-03-28 | 中国电子科技集团公司第十研究所 | Frequency tracking method of discontinuous carrier phase signals |
| CN103078660A (en) * | 2013-01-06 | 2013-05-01 | 中国电子科技集团公司第十研究所 | Method for reducing capturing time of spreading code in large dynamic range |
| CN104485976A (en) * | 2014-12-11 | 2015-04-01 | 中国工程物理研究院电子工程研究所 | High-dynamic weak-compounding code spread spectrum signal fast capturing method |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108900452A (en) * | 2018-05-25 | 2018-11-27 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Reduce the synchronization detecting method of frequency window |
| CN109495410B (en) * | 2018-09-28 | 2021-06-15 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | High dynamic PCM/FM signal carrier frequency accurate estimation method |
| CN109495410A (en) * | 2018-09-28 | 2019-03-19 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | High dynamic PCM/FM signal(-) carrier frequency precise Estimation Method |
| CN111352124A (en) * | 2018-12-21 | 2020-06-30 | 余姚舜宇智能光学技术有限公司 | Doppler signal demodulation method and system thereof |
| CN110138436A (en) * | 2019-02-15 | 2019-08-16 | 北京空间飞行器总体设计部 | A kind of each stage link receiver calculation method of parameters of soft lunar landing detection mission |
| CN110138436B (en) * | 2019-02-15 | 2022-07-29 | 北京空间飞行器总体设计部 | Method for calculating parameters of relay receiver at each stage of lunar soft landing detection task |
| CN110401611A (en) * | 2019-06-29 | 2019-11-01 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | The quickly method of detection CPFSK signal |
| CN110417697B (en) * | 2019-06-29 | 2021-10-15 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Precise frequency measurement method for high-dynamic weak MPSK signal |
| CN110417697A (en) * | 2019-06-29 | 2019-11-05 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | The accurate frequency measuring method of the faint mpsk signal of high dynamic |
| CN111624402A (en) * | 2020-05-31 | 2020-09-04 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Method for accurately estimating carrier frequency of weak PM signal |
| CN111624402B (en) * | 2020-05-31 | 2022-09-02 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Method for accurately estimating carrier frequency of weak PM signal |
| CN111884984A (en) * | 2020-06-29 | 2020-11-03 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Fast carrier Doppler frequency shift capturing system |
| CN111884984B (en) * | 2020-06-29 | 2022-09-02 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Fast carrier Doppler frequency shift capturing system |
| CN112968850A (en) * | 2021-02-10 | 2021-06-15 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Weak BPSK signal carrier capturing method |
| CN114553260A (en) * | 2022-02-17 | 2022-05-27 | 中国电子科技集团公司第十研究所 | High-precision measurement system for DS/FH spread spectrum signal carrier frequency |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108055058B (en) | 2020-04-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108055058A (en) | The high-precision measuring method of carrier doppler and its change rate | |
| CN109495410B (en) | High dynamic PCM/FM signal carrier frequency accurate estimation method | |
| CN102624419B (en) | Carrier synchronization method of burst direct sequence spread spectrum system | |
| CN101261318B (en) | High dynamic state spread-spectrum precise distance measurement receiving machine | |
| CN102435999B (en) | Baseband module of GPS (global positioning system) receiver and GPS signal acquiring and tracing method | |
| CN108667484A (en) | Incoherent spread spectrum digital transceiver instantaneous frequency measurement and demodulation method | |
| CN109633711B (en) | Ultra-large dynamic and high-sensitivity spread spectrum measurement and control baseband receiving method and device | |
| JPH02105746A (en) | Differental phase transition keying modulator | |
| CN102136850A (en) | Method and device for realizing automatic frequency control | |
| CN104614740A (en) | Data pilot frequency integrated tracking method and device for navigation signal | |
| CN108055224A (en) | 16QAM carrier synchronization loop genlocing detection methods | |
| CN108494714A (en) | A method of quickly overcoming the GMSK coherent demodulations of Doppler frequency shift | |
| CN106998586A (en) | The synchronization acquiring method of wireless communication system in a kind of high dynamic environment | |
| US20220416896A1 (en) | Method and apparatus for satellite laser broadband demodulation | |
| CN110417697A (en) | The accurate frequency measuring method of the faint mpsk signal of high dynamic | |
| CN102571652A (en) | Method for estimating global navigation satellite system (GNSS) baseband signal | |
| CN105388500A (en) | Method for improving continuous phrase frequency shift key (CPFSK) signal carrier tracking precision | |
| CN112367283B (en) | Carrier frequency offset estimation method for GFSK system | |
| CN104363194A (en) | PSK (phase shift keying) modulation recognition method based on wave form transformation | |
| CN106656400A (en) | Accurate frequency difference fast acquisition method in time delay jitter condition of PCMA system | |
| CN104849732A (en) | BOC radio frequency navigation signal tracking method | |
| CN111314262A (en) | 16QAM carrier synchronization system in low signal-to-noise ratio environment | |
| CN108650203A (en) | A kind of signal type Identification method based on reconnaissance receiver | |
| CN106341199B (en) | A kind of signal-to-noise ratio based on Manchester code determines method | |
| CN107167825A (en) | A kind of satellite navigation intermediate-freuqncy signal carrier track device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |