CN106411494A - Frequency offset compensation method and system - Google Patents
Frequency offset compensation method and system Download PDFInfo
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- CN106411494A CN106411494A CN201610782373.8A CN201610782373A CN106411494A CN 106411494 A CN106411494 A CN 106411494A CN 201610782373 A CN201610782373 A CN 201610782373A CN 106411494 A CN106411494 A CN 106411494A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
- H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
Abstract
The invention discloses a frequency offset compensation method and system. The method comprises the steps of: carrying out preprocessing on N paths of received array element signals; respectively carrying out digital down-conversion processing on the N paths of preprocessed array element signals so as to obtain N paths of target signals; aiming at each path of signal to be compensated, acquiring a relative frequency difference between the signal to be compensated and a reference signal, wherein the reference signal is a random path of signal in the N paths of target signal, and the signals to be compensated are signals in the N paths of target signals except for the reference signal; and aiming at each path of signal to be compensated, according to the relative frequency difference between the signal to be compensated and the reference signal, carrying out frequency offset compensation on the signal to be compensated. Implementation of the frequency offset compensation method and system disclosed by the invention has the beneficial effects that by a frequency offset compensator and a phase retrieval module, one random path of signal is used as the reference signal and the rest of channels are subjected to frequency offset compensation, so that frequency offset nonuniformity of the N paths of signals, which is generated by relative motion and a local oscillation error, can be improved.
Description
Technical field
It relates to communication technical field, in particular it relates to a kind of frequency bias compensation method and system.
Background technology
TDRSS Tracking and Data Relay Satellite System (tracking and data relay satellite, TDRSS) is high with it
Coverage rate, High Data Rate and Multi target TT＆C ability, serve extremely important effect in space technology development.
TDRSS is made up of two in-orbit synchronous relay satellites and earth station.The reverse link of TDRSS is remote measurement
Data is transferred to the information transfer channel of earth station from passive space vehicle part (for example, aircraft, user's magnitude), and it can pass simultaneously
The observing and controlling information of defeated multiple passive space vehicle part.In order to follow the tracks of and forwarding multiple targets simultaneously, on the repeater satellite of TDRSS generally
Using the phased array antenna based on Wave beam forming.And in order to reduce digital processing link on repeater satellite, so that on repeater satellite
Equipment is as simple as possible, expands the convenience following the tracks of number of targets after simultaneously taking account of, and TDRSS generally adopts DBF (digital wave under star
Bundle is formed) scheme.
In TDRSS based on DBF under star, repeater satellite has 30 independent helical antennas (array element), each array element
The signal receiving all is used for DBF under star by individual transmission to earth station.30 tunnel battle arrays can be transmitted using FDM (frequency division multiplexing) system
First signal.Relative phase according to 30 tunnel array element signals and amplitude, carry out terrestrial beam synthesis, constitute phased array " the many ripples in ground
Bundle is formed " system.
Based on the TDRRS system of DBF under star, due to using FDM transmission system by repeater satellite Shang 30 road bay
To ground, because phased array has 30 array-element antenna, corresponding FDM just has 30 autonomous channels to signal transmission.FDM synthesis with point
From during Up/Down Conversion, the local crystal oscillator of each passage is also unable to reach completely consistent, will draw to 30 paths signals
Enter inconsistent frequency deviation, therefore, it is difficult to ensure the uniformity of frequency deviation between 30 paths.For in correlation technique, typically using two
Solving the problems, such as the impact to communication system performance for the frequency shift (FS), one is using automatic frequency tracking loop (AFC), makes for kind of method
It is following the tracks of Doppler frequency shift.In such as communication system, phase-locked loop (PLL) is generally used to produce with carrier wave with frequency in receivers
The local signal of homophase is demodulated, to eliminate the impact of Doppler frequency shift；Another kind is to send one group in sending signal simultaneously
Pilot tone, adjusts local carrier signal by pilot signal, to correct the Doppler frequency shift producing in transmitting procedure.
But the two methods in correlation technique, are all the frequency bias properties for one-channel signal, do not consider multiple signals
Frequency deviation inconsistence problems.If additionally, each of TDRSS system passage is regarded as independent communication system using conventional lock phase
Loop carries out frequency deviation compensation, needs the signal of input to have higher signal to noise ratio, is otherwise difficult to realize Phase Tracking locking.And adopt
Based on the frequency deviation estimating method of pilot tone, pilot tone can take transmission channel, reduce efficiency of transmission, have a strong impact on TDRSS system simultaneously
Security.
Content of the invention
The purpose of the disclosure is to provide a kind of frequency bias compensation method and system, to solve multiple signals frequency in TDRSS system
Partially inconsistent problem.To achieve these goals, in a first aspect, the disclosure provides a kind of frequency bias compensation method, including：
The N road array element signals receiving are pre-processed；
Digital Down Convert process is carried out respectively to N road array element signals after pretreatment, to obtain N road echo signal；
For every road signal to be compensated, obtain the relative frequency difference between described signal to be compensated and reference signal, wherein, institute
State arbitrary road signal that reference signal is in the echo signal of described N road, described signal to be compensated is to remove in the echo signal of described N road
Signal outside described reference signal；
For every road signal to be compensated, according to the relative frequency difference between described signal to be compensated and described reference signal, right
Described signal to be compensated carries out frequency deviation compensation.
Optionally, the relative frequency difference between the described signal to be compensated of described acquisition and reference signal is：
Wherein,For relative frequency difference；M is multiple multiplied the arriving by described reference signal and a signal conjugation to be compensated
Sampled signal；For the auto-correlation function of described sampled signal, N is sample sequence length, and T is the sampling period.
Optionally, described for every road signal to be compensated, according between described signal to be compensated and described reference signal
Relative frequency difference, the step carrying out frequency deviation compensation to described signal to be compensated includes：
Described relative frequency difference is converted to frequency control word；
Control the frequency of oscillation of corresponding digital down converter according to described frequency control word, with to described letter to be compensated
Number carry out frequency deviation compensation.
Optionally, described described relative frequency difference is converted to frequency control word it is：
Wherein, K is frequency control word, and M is the bit wide of described digital down converter, fclkFor described digital down converter
Process clock, fFitzFor relative frequency difference.
Optionally, methods described also includes：
Carry out phase compensation to having carried out frequency deviation compensation Hou Mei road signal to be compensated.
Optionally, described to having carried out frequency deviation and compensate Hou Mei road signal to be compensated and carry out the step of phase compensation including：
According to default difference estimate, to every road, signal to be compensated carries out phase difference compensation；
According to the signal after described reference signal and phase difference compensation, obtain error；
According to the described error obtaining, described default difference estimate is updated.
Optionally, methods described also includes：
To described reference signal, and carried out frequency deviation compensate and phase compensation after signal to be compensated to enter line phase extensive
Multiple.
Optionally, methods described also includes：
According to phased array antenna steering vector, obtain the initial of each road signal of described N road array element signals receiving
Phase delay coefficient；
Obtain the direction of arrival of the N road signal after described phase recovery；
According to the angle information of user satellite, obtain the mean error estimating direction and accurate direction；
According to described mean error, update phase delay coefficient；
Time delay in the phase recovery described in phase delay coefficient adjustment updating.
Optionally, described according to described mean error, the step updating phase delay coefficient includes：
Described mean error and predetermined threshold value are compared；
When described mean error is more than or equal to described predetermined threshold value, update described phase delay coefficient.
Second aspect, provides a kind of frequency deviation compensation system, including：
Pretreatment module, for pre-processing to the N road array element signals receiving；
Digital down converter, for carrying out Digital Down Convert process respectively to N road array element signals after pretreatment, to obtain
Obtain N road echo signal；
Passage frequency offset compensation, for for every road signal to be compensated, obtain described signal to be compensated and reference signal it
Between relative frequency difference, wherein, described reference signal is the arbitrary road signal in the echo signal of described N road, described signal to be compensated
For the signal in addition to described reference signal in the echo signal of described N road；And,
For for every road signal to be compensated, according to the relative frequency between described signal to be compensated and described reference signal
Difference, carries out frequency deviation compensation to described signal to be compensated.
Optionally, the relative frequency difference between the described signal to be compensated of described acquisition and reference signal is：
Wherein,For relative frequency difference；M is multiple multiplied the arriving by described reference signal and a signal conjugation to be compensated
Sampled signal；For the auto-correlation function of described sampled signal, N is sample sequence length, and T is the sampling period.
Optionally, described passage frequency offset compensation, for being converted to frequency control word by described relative frequency difference；And according to
Described frequency control word controls the frequency of oscillation of corresponding digital down converter, to carry out frequency deviation benefit to described signal to be compensated
Repay.
Optionally, described described relative frequency difference is converted to frequency control word it is：
Wherein, K is frequency control word, and M is the bit wide of described digital down converter, fclkFor described digital down converter
Process clock, fFitzFor relative frequency difference.
Optionally, described passage frequency offset compensation, is additionally operable to having carried out frequency deviation and compensate Hou Mei road signal to be compensated entering
Line phase compensates.
Optionally, described system also includes：
Phase restoring module, for described reference signal, and carried out frequency deviation compensate and phase compensation after waiting mend
Repay signal and carry out phase recovery.
Optionally, described system also includes：
Phase delay coefficient optimization module, for according to phased array antenna steering vector, obtaining the described N road battle array receiving
The initial phase retardation coefficient of each road signal of first signal；Obtain the N road signal after recovering through described phase restoring module
Direction of arrival；According to the angle information of user satellite, obtain the mean error estimating direction and accurate direction；According to described average mistake
Difference, updates phase delay coefficient；According in the phase recovery of phase restoring module described in phase delay coefficient adjustment updating
Time delay.
By technique scheme, by frequency offset compensation and phase restoring module, it adopts arbitrary road signal as ginseng
Examine signal, frequency deviation compensation is carried out to rest channels, the N road signal frequency deviation non-being produced by relative motion and local oscillator error can be improved
Cause property；Frequency deviation compensation is carried out to multiple signals using passage frequency offset compensation it is not necessary to relay satellite transmitting pilot signal, decrease
The transmitting power consumption of relay satellite, improves band efficiency；Passage frequency offset compensation utilizes frequency excursion algorithm and self adaptation phase place
Compensation technique compensates to passage frequency deviation, and wherein frequency excursion algorithm can roughly estimate and be compensated between passage and reference channel
Relative frequency deviation, self adaptation Phase Compensation then can eliminate the impact of residual frequency departure, can effectively reduce interchannel frequency relatively
Partially；By the way of compensating interchannel relative frequency deviation, can reduce while not affecting DBF synthetic effect and realize difficulty；Base
In the decision method of error in pointing, the error of real-time estimation direction of arrival and actual direction, dynamic adjustment phase place retardation coefficient, make
System has adaptive characteristic.
Other feature and advantage of the disclosure will be described in detail in subsequent specific embodiment part.
Brief description
Accompanying drawing is used to provide further understanding of the disclosure, and constitutes the part of specification, with following tool
Body embodiment is used for explaining the disclosure together, but does not constitute restriction of this disclosure.In the accompanying drawings：
Fig. 1 is the structural representation of the TDRSS system of the embodiment of the present disclosure；
Fig. 2 is the structural representation of the frequency deviation compensation system of the disclosure one embodiment；
Fig. 3 is that the phase recovery of the disclosure one embodiment realizes structural representation；
Fig. 4 is that the phase recovery of the disclosure one embodiment realizes schematic flow sheet；
Fig. 5 is the structural representation of the frequency deviation compensation system of another embodiment of the disclosure；
Fig. 6 is that the structure of the phase restoring module of the disclosure one embodiment realizes schematic diagram；
Fig. 7 is the LMS algorithm schematic flow sheet of the disclosure one embodiment；
Fig. 8 is the schematic flow sheet of the frequency bias compensation method of the disclosure one embodiment.
Specific embodiment
It is described in detail below in conjunction with accompanying drawing specific embodiment of this disclosure.It should be appreciated that this place is retouched
The specific embodiment stated is merely to illustrate and explains the disclosure, is not limited to the disclosure.
There are multichannel array element signals for TDRSS reverse link and there is incomparable inconsistent frequency deviation problem, the disclosure through channel
There is provided a kind of frequency deviation compensation system and method, the self-adapting linkage compensating based on multichannel array element signals nonuniformity frequency deviation, to change
The impact to DBF pointing accuracy under star for the kind multichannel array element signals nonuniformity frequency deviation.
Referring to Fig. 1, it is the structural representation of the TDRSS system of the embodiment of the present disclosure.TDRSS Tracking and Data Relay Satellite System
(tracking and data relay satellite, TDRSS) includes repeater satellite 20 and earth station 10.Repeater satellite 20
The telemetry data transmission of user satellite 30 to earth station 10.Repeater satellite 20 can be using the phased array antenna based on Wave beam forming.
30 independent helical antennas (array element) are had on repeater satellite 20, the signal that each array element receives is by individual transmission to ground
Stand 10 for DBF under star.Repeater satellite 20 can transmit 30 tunnel array element signals using FDM (frequency division multiplexing) system.Earth station 10
Relative phase according to 30 tunnel array element signals and amplitude, carry out terrestrial beam synthesis.
Referring to Fig. 2, it is the structural representation of the frequency deviation compensation system of the disclosure one embodiment.The frequency deviation of the embodiment of the present disclosure
Compensation system 200 includes：Prime processing module 201, A/D converter 202, digital down converter 203 and passage frequency offset compensation
204.
In an embodiment of the disclosure, the array element signals that earth station 10 receives have N road, then have N number of A/D to turn accordingly
Parallel operation, N number of digital down converter and N-1 passage frequency offset compensation 204 alignment processing each road array element signals respectively.In this public affairs
In the embodiment opened, N is the integer more than 2.In one embodiment, N is 30.
Referring to Fig. 2, the antenna of earth station 10 receives the FDM signal of the N road array element from relay satellite 20 transmitting.Prime is processed
Module 201 is used for the N road array element signals receiving are carried out the process such as low noise amplification, frequency conversion, wideband filtered and FDM pre-separation.
Signal after A/D converter 202 is used for prime processing module 201 is processed carries out A/D conversion.
In embodiment of the disclosure, pretreatment module includes prime processing module 201 and A/D converter 202, docking
The N road array element signals receiving are pre-processed, and for example, low noise amplification, frequency conversion, wideband filtered, FDM pre-separation and A/D turn
Change etc. and to process.
Digital down converter 203 is used for carrying out Digital Down Convert process respectively to N road array element signals after pretreatment, with
Obtain N road echo signal.Digital down converter 203 will extract required from the data signal that A/D converter 202 is converted to
Narrow band signal, is down-converted to digital baseband signal, and to be converted into relatively low data flow be echo signal.Digital down converter
203 may include digital mixer, numerically-controlled oscillator (NCO) and low pass filter (LPF) three part.
Wherein, NCO is mainly made up of three parts：Phase accumulator, phase addition device and sin/cos table read-only storage.
In the disclosure one embodiment, the basic function of numerically-controlled oscillator (NCO) includes：Receives frequency control word K is added up；With
The OPADD of phase accumulator, is addressed to the memory having just (remaining) string range value；Check the numerical value on this address
And export digital mixer.The discrete amplitudes coding of output is the output result of NCO.
The signal that NCO exports is multiplied by digital mixer with sample of signal, and product sample exports after low-pass filtered device again,
Complete Digital Down Convert.
In an embodiment of the disclosure, the signal choosing a railway digital low-converter 203 output, will used as reference signal
The signal of remaining N-1 railway digital low-converter 203 output carries out frequency deviation compensation as signal to be compensated.In an embodiment
In, can be using first via signal as reference signal.
Passage frequency offset compensation 204 is directed to every road signal to be compensated, obtains between described signal to be compensated and reference signal
Relative frequency difference, wherein, described reference signal is the arbitrary road signal in the echo signal of described N road, and described signal to be compensated is
Signal in addition to described reference signal in the echo signal of described N road；And, for for every road signal to be compensated, according to institute
State the relative frequency difference between signal to be compensated and described reference signal, frequency deviation compensation is carried out to described signal to be compensated.In this public affairs
In the embodiment opened, passage frequency offset compensation is obtained between reference signal and each signal to be compensated using default frequency excursion algorithm
Relative frequency difference, and relative frequency difference is changed into frequency control word K, and feeds back to corresponding digital down converter 203.Under numeral
The frequency of oscillation of the FREQUENCY CONTROL regulation Digital Down Convert according to feedback for the frequency converter 203, treats thermal compensation signal with realization and carries out
Frequency deviation compensation adjustment.
In embodiment of the disclosure, default frequency excursion algorithm can be Fitz frequency excursion algorithm.First, according to formula
(1) calculate the relative frequency difference between every road signal to be compensated and reference signal.
Wherein,For relative frequency difference, sampled signal m is that reference signal is arrived with the multiple multiplied of signal conjugation to be compensated
Signal.For the auto-correlation function of sampled signal, N is sample sequence length, and T is the sampling period.Longer sample sequence
Correspond to better estimation effect, but longer sample sequence can increase estimation time delay and algorithm complex.
Then, the relative frequency difference obtaining according to formula (1) is converted to corresponding frequency control word K by formula (2), with anti-
Feed corresponding digital down converter 203.
Wherein, M is the bit wide of digital down converter, fclkFor the process clock of digital down converter, fFitzIt is frequency relatively
Difference.
Referring to Fig. 3, wherein, xiT () is signal to be compensated, xrefT () is reference signal.Reference signal and signal to be compensated
Conjugation multiple multiplied to signal obtain frequency control word K through offset estimation, to adjust the frequency of oscillation of NCO.
Digital down converter 203 adjusts the local oscillating frequency of down coversion according to the frequency control word K of feedback, to realize frequency
Inclined compensation.Hereby it is achieved that compensating to the frequency deviation of N road array element signals.In embodiment of the disclosure, digital down converter 203
Dynamically the frequency of oscillation of Digital Down Convert can be adjusted according to the frequency control word of passage frequency offset compensation 204 feedback,
For example, dynamic regulation is carried out according to Preset Time.For example, numeral is carried out according to the frequency control word of feedback every Preset Time
The adjustment of down coversion frequency of oscillation.
The frequency deviation compensation system of the embodiment of the present disclosure, by the way of compensating interchannel relative frequency deviation, adjusts each paths
Signal and reference information between frequency difference, can reduce while not affecting DBF synthetic effect and realize difficulty；And using logical
Road frequency offset compensation carries out frequency deviation compensation to multiple signals it is not necessary to relay satellite transmitting pilot signal, decreases sending out of relay satellite
Penetrate power consumption, improve band efficiency.
When being compensated due to frequency deviation, by signal to noise ratio, sampling length be non-ideal etc., factor is affected, and interchannel may exist residual
Remaining frequency difference, in embodiment of the disclosure, passage frequency offset compensation 204 be additionally operable to carried out frequency deviation compensate Hou Mei road wait to mend
Repay signal and carry out phase compensation, it compensates the phase place being caused by small frequency difference between two signals not by self adaptation Phase Compensation Algorithm
Unanimously.The self adaptation Phase Compensation Algorithm being the embodiment of the present disclosure referring to Fig. 3 and Fig. 4 realize structure, this algorithm is using minimum
Gradient method searches for minimum of a value, estimates the phase difference of two signals by following three steps of circulation, realizes phase compensation.
In step S41, according to default difference estimate, thermal compensation signal is treated by formula (3) and carries out phase difference compensation.
Wherein, xiK () is signal to be compensated,For default difference estimate.
In step S42, signal according to reference signal and after phase difference compensation, obtain error.Error passes through formula (4)
Obtain.
In step S43, according to the error obtaining, update difference estimate.By formula (5), difference estimate is carried out more
Newly.
Wherein, gradientCan be expressed asFor pre-
If difference estimate, μ is step factor, can be used for adjusting convergence of algorithm speed.
Thus, the frequency bias compensation method of the embodiment of the present disclosure can be compensated by frequency deviation and phase compensation, realizes letter to be compensated
Number compensate with the frequency deviation of reference signal, the phase between the N road array element signals being received by N-1 passage frequency offset compensation, elimination
To frequency deviation.
Referring to Fig. 5, the frequency deviation compensation system of the embodiment of the present disclosure also includes：Phase restoring module 205 and phase delay system
Number optimization module 206.
Phase restoring module 205, for described reference signal, and carried out frequency deviation compensate and phase compensation after treating
Thermal compensation signal carries out phase recovery.
Phase delay coefficient optimization module 206, for according to phased array antenna steering vector, obtaining the described N receiving
The initial phase retardation coefficient of each road signal of road array element signals；Obtain the N road letter after recovering through described phase restoring module
Number direction of arrival；According to the angle information of user satellite, obtain the mean error estimating direction and accurate direction；According to described flat
All errors, update phase delay coefficient；Phase recovery according to the phase restoring module described in phase delay coefficient adjustment updating
In time delay.
Because self adaptation Phase Compensation Algorithm can destroy the phase characteristic between the signal of N road, in an embodiment of the disclosure
In phase restoring module 205, optimize the phase difference of N road signal using LMS algorithm, to reduce by passage frequency offset compensation 204
The phase distortion bringing.Structure referring to the phase restoring module for the disclosure one embodiment for the Fig. 6 realizes schematic diagram, for each
Road signal, carries out phase recovery using corresponding phase delay coefficient.
Phase delay coefficient optimization module 206 is calculated the initial of each road signal according to phased array antenna steering vector
Phase delay coefficient.Wherein, formula (6) show phased antenna steering vector, formula (7) initial phase retardation coefficient.
Wherein, λ is wavelength, and d is array element distance.
The direction of arrival of the 30 road signals exporting after calculating phase recoveryIt is that M user satellite estimates what angle was constituted
Vector, can be using suitable DOA estimation algorithm, such as MUSIC algorithm.The angle information of user satellite, can be according to observing and controlling and star
Go through file to obtain.
Angle information according to user satellite calculates the mean error estimating direction and accurate directionWith e
K (), as error function, updates phase delay coefficient L using the LMS algorithm flow process shown in Fig. 7, and adjustment phase place is recovered accordingly
The time delay of middle N road signal.
Phase delay coefficient optimization module 206 detection error function e (k) and the size of predetermined threshold value, as error function e
(k)<During ε (ε is predetermined threshold value), the error in pointing minimum of a value that as system allows (can obtain under not having non-uniform offset frequency situation
), now explanation frequency deviation compensates and phase recovery effect disclosure satisfy that system requirements, therefore stops phase place in renewal phase recovery and prolong
Coefficient late, keeps the frequency control word K of passage frequency offset compensation 204 output constant simultaneously, system entrance stable state.As e (k)
During >=ε, phase delay coefficient can be readjusted, and frequency control word K.It should be understood that adjustment frequency control word K can be by adjustment
Realized using serial length, sampling period etc..
In embodiment of the disclosure, after the signal that exported by phase restoring module 205 can enter ground terminal
Level is processed, and completes digital beam froming, despread and demodulated etc..
The frequency deviation compensation system of the embodiment of the present disclosure, by frequency offset compensation and phase restoring module, it adopts arbitrary road
Signal, as reference signal, carries out frequency deviation compensation to rest channels, can not only improve the N being produced by relative motion and local oscillator error
Road signal frequency deviation nonuniformity problem, eliminates DBF and points to periodically drift moreover it is possible to equilibrium rest channels produce in transmitting procedure
Signal distortion.Pass through the error in observability estimate direction and accurate direction, real-time adjustment frequency deviation compensating parameter simultaneously, make this compensation
Method has adaptivity.
Referring to Fig. 8, the schematic flow sheet of the frequency bias compensation method of the embodiment of the present disclosure.This frequency bias compensation method includes following
Step：
In step S81, the N road array element signals receiving are pre-processed.
In step S82, Digital Down Convert process is carried out respectively to N road array element signals after pretreatment, to obtain N road
Echo signal.
In step S83, for every road signal to be compensated, obtain relative between described signal to be compensated and reference signal
Frequency difference, wherein, described reference signal is the arbitrary road signal in the echo signal of described N road, and described signal to be compensated is described N road
Signal in addition to described reference signal in echo signal.
In one embodiment, the relative frequency difference between the described signal to be compensated of acquisition and reference signal is：
Wherein,For relative frequency difference；M is multiple multiplied the arriving by described reference signal and a signal conjugation to be compensated
Sampled signal；For the auto-correlation function of described sampled signal, N is sample sequence length, and T is the sampling period.
In step S84, for every road signal to be compensated, according between described signal to be compensated and described reference signal
Relative frequency difference, carries out frequency deviation compensation to described signal to be compensated.Described relative frequency difference is converted to frequency control word, FREQUENCY CONTROL
Word is shown below：
Wherein, K is frequency control word, and M is the bit wide of described digital down converter, fclkFor described digital down converter
Process clock, fFitzFor relative frequency difference.
In one embodiment, control the frequency of oscillation of corresponding digital down converter according to described frequency control word,
So that frequency deviation compensation is carried out to described signal to be compensated.
Because frequency deviation compensates by signal to noise ratio, sampling length be non-ideal etc., factor is affected, and interchannel may have remnants
Frequency difference, in embodiment of the disclosure, frequency bias compensation method also includes：
Carry out phase compensation to having carried out frequency deviation compensation Hou Mei road signal to be compensated.
In one embodiment, compensate the step bag that Hou Mei road signal to be compensated carries out phase compensation to having carried out frequency deviation
Include：
According to default difference estimate, to every road, signal to be compensated carries out phase difference compensation；
According to the signal after described reference signal and phase difference compensation, obtain error；
According to the described error obtaining, described default difference estimate is updated.
In one embodiment, the frequency bias compensation method of the embodiment of the present disclosure also includes：
To described reference signal, and carried out frequency deviation compensate and phase compensation after signal to be compensated to enter line phase extensive
Multiple.
In one embodiment, the frequency bias compensation method of the embodiment of the present disclosure also includes：
According to phased array antenna steering vector, obtain the initial of each road signal of described N road array element signals receiving
Phase delay coefficient；
Obtain the direction of arrival of the N road signal after described phase recovery；
According to the angle information of user satellite, obtain the mean error estimating direction and accurate direction；
According to described mean error, update phase delay coefficient；
Time delay in the phase recovery described in phase delay coefficient adjustment updating.
In one embodiment, described according to described mean error, the step updating phase delay coefficient includes：
Described mean error and predetermined threshold value are compared；
When described mean error is more than or equal to described predetermined threshold value, update described phase delay coefficient.
Enable the system to dynamically adjust frequency deviation compensating parameter based on the decision-feedback method of error in pointing, improve multiple signals
Between relative frequency deviation, periodically drift about thus eliminating DBF and pointing to, improve DBF pointing accuracy under star.
With regard to the method in above-described embodiment, wherein the concrete mode of each step execution operation is in this system relevant
Embodiment in be described in detail, explanation will be not set forth in detail herein.
The frequency deviation compensation system of the embodiment of the present disclosure and method, by frequency offset compensation and phase restoring module, it adopts
Arbitrary road signal, as reference signal, carries out frequency deviation compensation to rest channels, can improve and be produced by relative motion and local oscillator error
N road signal frequency deviation nonuniformity；Frequency deviation compensation is carried out it is not necessary to relay satellite is sent out to multiple signals using passage frequency offset compensation
Penetrate pilot signal, decrease the transmitting power consumption of relay satellite, improve band efficiency；Passage frequency offset compensation utilizes offset estimation
Algorithm and self adaptation Phase Compensation compensate to passage frequency deviation, and wherein frequency excursion algorithm can roughly estimate and be compensated
Relative frequency deviation between passage and reference channel, self adaptation Phase Compensation then can eliminate the impact of residual frequency departure, can effectively drop
Low interchannel relative frequency deviation；By the way of compensating interchannel relative frequency deviation, can be while not affecting DBF synthetic effect
Reduce and realize difficulty；Based on the decision method of error in pointing, real-time estimation direction of arrival and the error of actual direction, dynamically adjust
Phase delay coefficient, makes system have adaptive characteristic.
Describe the preferred embodiment of the disclosure above in association with accompanying drawing in detail, but, the disclosure is not limited to above-mentioned reality
Apply the detail in mode, in the range of the technology design of the disclosure, multiple letters can be carried out with technical scheme of this disclosure
Monotropic type, these simple variant belong to the protection domain of the disclosure.
It is further to note that each particular technique feature described in above-mentioned specific embodiment, in not lance
In the case of shield, can be combined by any suitable means.
Additionally, can also be combined between the various different embodiment of the disclosure, as long as it is without prejudice to this
Disclosed thought, it equally should be considered as disclosure disclosure of that.
Claims (16)
1. a kind of frequency bias compensation method is it is characterised in that include：
The N road array element signals receiving are pre-processed；
Digital Down Convert process is carried out respectively to N road array element signals after pretreatment, to obtain N road echo signal；
For every road signal to be compensated, obtain the relative frequency difference between described signal to be compensated and reference signal, wherein, described ginseng
Examine arbitrary road signal that signal is in the echo signal of described N road, described signal to be compensated is except described in the echo signal of described N road
Signal outside reference signal；
For every road signal to be compensated, according to the relative frequency difference between described signal to be compensated and described reference signal, to described
Signal to be compensated carries out frequency deviation compensation.
2. method according to claim 1 is it is characterised in that between the described signal to be compensated of described acquisition and reference signal
Relative frequency difference be：
Wherein,For relative frequency difference；M be by described reference signal and a signal to be compensated conjugation multiple multiplied to adopt
Sample signal；For the auto-correlation function of described sampled signal, N is sample sequence length, and T is the sampling period.
3. the method according to claim 1 or 2 any one it is characterised in that described for every road signal to be compensated, according to
Relative frequency difference between described signal to be compensated and described reference signal, the step that frequency deviation compensation is carried out to described signal to be compensated
Including：
Described relative frequency difference is converted to frequency control word；
Control the frequency of oscillation of corresponding digital down converter according to described frequency control word, to enter to described signal to be compensated
Line frequency offset compensation.
4. method according to claim 3 is it is characterised in that described be converted to frequency control word by described relative frequency difference
For：
Wherein, K is frequency control word, and M is the bit wide of described digital down converter, fclkProcess for described digital down converter
Clock, fFitzFor relative frequency difference.
5. method according to claim 1 is it is characterised in that methods described also includes：
Carry out phase compensation to having carried out frequency deviation compensation Hou Mei road signal to be compensated.
6. method according to claim 5 is it is characterised in that described compensate Hou Mei road letter to be compensated to having carried out frequency deviation
The step number carrying out phase compensation includes：
According to default difference estimate, to every road, signal to be compensated carries out phase difference compensation；
According to the signal after described reference signal and phase difference compensation, obtain error；
According to the described error obtaining, described default difference estimate is updated.
7. method according to claim 5 is it is characterised in that methods described also includes：
To described reference signal, and the signal to be compensated having carried out after frequency deviation compensation and phase compensation carries out phase recovery.
8. method according to claim 7 is it is characterised in that methods described also includes：
According to phased array antenna steering vector, obtain the initial phase of each road signal of described N road array element signals receiving
Retardation coefficient；
Obtain the direction of arrival of the N road signal after described phase recovery；
According to the angle information of user satellite, obtain the mean error estimating direction and accurate direction；
According to described mean error, update phase delay coefficient；
Time delay in the phase recovery described in phase delay coefficient adjustment updating.
9. method according to claim 8 it is characterised in that described according to described mean error, update phase delay system
The step of number includes：
Described mean error and predetermined threshold value are compared；
When described mean error is more than or equal to described predetermined threshold value, update described phase delay coefficient.
10. a kind of frequency deviation compensation system is it is characterised in that include：
Pretreatment module, for pre-processing to the N road array element signals receiving；
Digital down converter, for carrying out Digital Down Convert process respectively to N road array element signals after pretreatment, to obtain N
Road echo signal；
Passage frequency offset compensation, for for every road signal to be compensated, obtaining between described signal to be compensated and reference signal
Relative frequency difference, wherein, described reference signal is the arbitrary road signal in the echo signal of described N road, and described signal to be compensated is institute
State the signal in addition to described reference signal in the echo signal of N road；And,
For for every road signal to be compensated, according to the relative frequency difference between described signal to be compensated and described reference signal, right
Described signal to be compensated carries out frequency deviation compensation.
11. systems according to claim 10 it is characterised in that the described signal to be compensated of described acquisition and reference signal it
Between relative frequency difference be：
Wherein,For relative frequency difference；M be by described reference signal and a signal to be compensated conjugation multiple multiplied to adopt
Sample signal；For the auto-correlation function of described sampled signal, N is sample sequence length, and T is the sampling period.
12. systems according to claim 10 or 11 any one, it is characterised in that described passage frequency offset compensation, are used for
Described relative frequency difference is converted to frequency control word；And corresponding digital down converter is controlled according to described frequency control word
Frequency of oscillation, so that frequency deviation compensation is carried out to described signal to be compensated.
13. systems according to claim 12 are it is characterised in that described be converted to frequency control word by described relative frequency difference
For：
Wherein, K is frequency control word, and M is the bit wide of described digital down converter, fclkProcess for described digital down converter
Clock, fFitzFor relative frequency difference.
14. systems according to claim 10 it is characterised in that described passage frequency offset compensation, are additionally operable to carrying out
Frequency deviation compensates Hou Mei road signal to be compensated and carries out phase compensation.
15. systems according to claim 14 are it is characterised in that described system also includes：
Phase restoring module, for described reference signal, and carried out frequency deviation compensate and phase compensation after letter to be compensated
Number carry out phase recovery.
16. systems according to claim 15 are it is characterised in that described system also includes：
Phase delay coefficient optimization module, for according to phased array antenna steering vector, obtaining the described N road array element letter receiving
Number each road signal initial phase retardation coefficient；The ripple obtaining the N road signal after recovering through described phase restoring module reaches
Direction；According to the angle information of user satellite, obtain the mean error estimating direction and accurate direction；According to described mean error,
Update phase delay coefficient；Delay in the phase recovery of phase restoring module described in phase delay coefficient adjustment updating
Time.
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