CN109474295A - A kind of baseband processing method for spaceborne measuring and controlling equipment - Google Patents
A kind of baseband processing method for spaceborne measuring and controlling equipment Download PDFInfo
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- CN109474295A CN109474295A CN201811578629.9A CN201811578629A CN109474295A CN 109474295 A CN109474295 A CN 109474295A CN 201811578629 A CN201811578629 A CN 201811578629A CN 109474295 A CN109474295 A CN 109474295A
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- 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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0404—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas the mobile station comprising multiple antennas, e.g. to provide uplink diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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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
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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
- H04L7/027—Speed or phase control by the received code signals, the signals containing no special synchronisation information extracting the synchronising or clock signal from the received signal spectrum, e.g. by using a resonant or bandpass circuit
- H04L7/0274—Speed or phase control by the received code signals, the signals containing no special synchronisation information extracting the synchronising or clock signal from the received signal spectrum, e.g. by using a resonant or bandpass circuit with Costas loop
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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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Abstract
The invention discloses a kind of baseband processing methods for spaceborne measuring and controlling equipment.The baseband processing method includes: processing uplink low frequency signal, forward distance measuring signal, demodulate remote signal, modulate telemetered signal and modulation downlink low frequency signal, wherein baseband signal is down-converted to by handling uplink low frequency signal, and measure the Doppler frequency shift of the carrier wave of uplink low frequency signal, distance measuring signal is isolated in forwarding distance measuring signal, and generate ranging fundamental frequency modulated signal, remote signal is isolated in demodulation remote signal, demodulation obtains remote-control data, telemetry is modulated into telemetering fundamental frequency modulated signal in modulation telemetered signal, then ranging fundamental frequency modulated signal and telemetering fundamental frequency modulated signal are modulated to downlink low frequency carrier signal respectively in row low frequency signal under modulation, then carrying out digital-to-analogue conversion is downlink low frequency signal.Through this process method may be implemented that uplink signal and downlink signal handle it is effective be connected, when multi-signal processing, can cooperate, and be conducive to improve signal spectrum utilization rate and signal reception.
Description
Technical field
The present invention relates to satellite communication field more particularly to a kind of baseband processing methods for spaceborne measuring and controlling equipment.
Background technique
In the Base-Band Processing of spaceborne measuring and controlling equipment, it usually needs processing multi-signal, the existing reception to uplink signal
Demodulation also has the modulation to downlink signal to send, and these methods are usually to isolate in Base-Band Processing, are lacked mutual
Association and cooperation.
Accordingly, it is desirable to provide a kind of can be to the baseband processing method that multi-signal is handled.
Summary of the invention
The invention mainly solves the technical problem of providing a kind of baseband processing methods for spaceborne measuring and controlling equipment, solve
It is had a single function in spaceborne measuring and controlling equipment Base-Band Processing, the problem that the signal degree of association is not high.
In order to solve the above technical problems, one technical scheme adopted by the invention is that providing a kind of for spaceborne measuring and controlling equipment
Baseband processing method, comprising: processing uplink low frequency signal, to the received uplink low frequency signal after over-sampling, to institute
It states uplink low frequency signal and carries out capturing carrier and carrier track, measure the Doppler frequency shift of the carrier wave of the uplink low frequency signal,
The uplink low frequency signal is down-converted into baseband signal；Distance measuring signal is forwarded, ranging letter is isolated from the baseband signal
Number, then distance measuring signal forwarding is modulated to the first fundamental frequency carrier wave, obtain ranging fundamental frequency modulated signal；Remote signal is demodulated,
Remote signal is isolated from the baseband signal, then the remote signal is demodulated to obtain remote-control data output；Modulation
Telemetry from spaceborne controller is modulated to the second fundamental frequency carrier wave, obtains telemetering fundamental frequency modulated signal by telemetered signal；It adjusts
The ranging fundamental frequency modulated signal and telemetering fundamental frequency modulated signal are modulated to downlink low frequency respectively and carried by downlink low frequency signal processed
Wave, then carrying out digital-to-analogue conversion is downlink low frequency signal.
In baseband processing method another embodiment of the present invention for spaceborne measuring and controlling equipment, to uplink low frequency signal
In capturing carrier, including carrying out quadrature frequency conversion again after sampling to the uplink low frequency signal of input, and extraction filter is carried out
Complex baseband signal is obtained after wave processing, FFT calculating then is done to the complex baseband signal, then calculate FFT calculated result and correspond to
Range value, then the range value is averaging processing, the corresponding FFT index number of obtained amplitude peak peak value is
Corresponding offset estimation value.
In baseband processing method another embodiment of the present invention for spaceborne measuring and controlling equipment, to uplink low frequency signal
In carrier track, be first the quadrature carrier signals in carrier track are corrected using the offset estimation value, and utilize described in
Quadrature carrier signals carry out down coversion to the uplink low frequency signal after sampling, and base band letter is then obtained after low-pass filtering
Number, wherein baseband signal exports all the way, another way baseband signal carries out the quadrature carrier signals using after loop filtering
Amendment in real time.
In baseband processing method another embodiment of the present invention for spaceborne measuring and controlling equipment, in the forwarding distance measuring signal
In, including to the distance measuring signal is obtained after baseband signal progress low-pass filtering, then again forward the distance measuring signal
It is modulated to the first fundamental frequency carrier wave, obtains the ranging fundamental frequency modulated signal.
In baseband processing method another embodiment of the present invention for spaceborne measuring and controlling equipment, in the demodulation remote signal
In, remote signal is obtained including carrying out quadrature frequency conversion to the baseband signal of input, after low-pass filtering, to the remote control
Capture sequence in signal carries out FFT energy measuring, determines the initial time of the remote signal, is synchronized by Costas ring
Remote-control data is exported after capture and tracking, then after making decisions to each of remote signal data.
In baseband processing method another embodiment of the present invention for spaceborne measuring and controlling equipment, in the modulation telemetered signal
In, after the telemetry first carries out BPSK modulation, and telemetering fundamental frequency modulated signal is obtained after the second fundamental frequency carrier multiplication.
In baseband processing method another embodiment of the present invention for spaceborne measuring and controlling equipment, in the modulation downlink low frequency
In signal, the downlink low frequency carrier signal is generated by DDS generator, and the downlink low frequency that the DDS generator generates carries
The frequency values of wave are controlled equal to reference value or equal to the correction value of reference value and Nonlinear Transformation in Frequency Offset Estimation value and/or poor.
The beneficial effects of the present invention are: the invention discloses a kind of baseband processing methods for spaceborne measuring and controlling equipment.It should
Baseband processing method includes: processing uplink low frequency signal, forwarding distance measuring signal, demodulation remote signal, modulation telemetered signal and tune
Downlink low frequency signal processed wherein being down-converted to baseband signal by handling uplink low frequency signal, and measures uplink low frequency letter
Number carrier wave Doppler frequency shift, isolate distance measuring signal in forwarding distance measuring signal, and generate ranging fundamental frequency modulated signal,
Remote signal is isolated in demodulation remote signal, and demodulation obtains remote-control data, telemetry is modulated in modulation telemetered signal
At telemetering fundamental frequency modulated signal, then under modulation in row low frequency signal by ranging fundamental frequency modulated signal and telemetering fundamental frequency modulation letter
Number it is modulated to downlink low frequency carrier signal respectively, then carrying out digital-to-analogue conversion is downlink low frequency signal.Method can be real through this process
Existing uplink signal and downlink signal handle it is effective be connected, multi-signal can cooperate when handling, and be conducive to raising signal
The availability of frequency spectrum and signal reception.
Detailed description of the invention
Fig. 1 is the composition block diagram according to one embodiment of baseband processing unit for spaceborne measuring and controlling equipment；
Fig. 2 is shown according to for the uplink low frequency signal frequency spectrum in one embodiment of baseband processing unit of spaceborne measuring and controlling equipment
It is intended to；
Fig. 3 be according to for spaceborne measuring and controlling equipment one embodiment of baseband processing unit in ranging fundamental frequency modulated signal and
Telemetering fundamental frequency spectrum modulation signal schematic diagram；
Fig. 4 is shown according to for the downlink low frequency signal frequency spectrum in one embodiment of baseband processing unit of spaceborne measuring and controlling equipment
It is intended to；
Fig. 5 is according to for the capturing carrier and tracking module in one embodiment of baseband processing unit of spaceborne measuring and controlling equipment
Composition figure；
Fig. 6 is according to the capturing carrier circuit group in the group for one embodiment of baseband processing unit of spaceborne measuring and controlling equipment
Cheng Tu；
Fig. 7 is according to the carrier tracking circuit group in the group for one embodiment of baseband processing unit of spaceborne measuring and controlling equipment
Cheng Tu；
Fig. 8 is according to the ranging forwarding module group in the group for one embodiment of baseband processing unit of spaceborne measuring and controlling equipment
Cheng Tu；
Fig. 9 is according to the remote control demodulation module group in the group for one embodiment of baseband processing unit of spaceborne measuring and controlling equipment
Cheng Tu；
Figure 10 is according to the telemetering modulation module in the group for one embodiment of baseband processing unit of spaceborne measuring and controlling equipment
Composition figure；
Figure 11 is the controlled NCO module composition figure according to one embodiment of baseband processing unit for spaceborne measuring and controlling equipment；
Figure 12 is one embodiment flow chart of baseband processing method for being used for spaceborne measuring and controlling equipment according to the present invention.
Specific embodiment
To facilitate the understanding of the present invention, in the following with reference to the drawings and specific embodiments, the present invention will be described in more detail.
A better embodiment of the invention is given in the attached drawing.But the invention can be realized in many different forms, and unlimited
In this specification described embodiment.On the contrary, purpose of providing these embodiments is makes to the disclosure
Understand more thorough and comprehensive.
It should be noted that unless otherwise defined, all technical and scientific terms used in this specification with belong to
The normally understood meaning of those skilled in the art of the invention is identical.Used term in the description of the invention
It is the purpose in order to describe specific embodiment, is not intended to the limitation present invention.Term "and/or" packet used in this specification
Include any and all combinations of one or more related listed items.
Fig. 1 shows the composition block diagram of one embodiment of baseband processing unit for spaceborne measuring and controlling equipment.It, should in Fig. 1
Baseband processing unit 10 includes capturing carrier and tracking module 11, ranging forwarding module 12, remote control demodulation module 13, controlled NCO
Module 14, telemetering modulation module 15, Corticofugal Modulation of Somatosensory module 16 and interface module 17；Uplink low frequency letter from data feedback channel circuit
Number by converter 21 sampling after be input to the capturing carrier and tracking module 11, to the carrier wave of the uplink low frequency signal
It is captured and is tracked, measure the Doppler frequency shift of the carrier wave of the uplink low frequency signal, will be become under the uplink low frequency signal
Frequency is baseband signal；The ranging forwarding module 12 receives the baseband signal that the capturing carrier and tracking module 11 export, from
Distance measuring signal is obtained in the baseband signal, then distance measuring signal forwarding is modulated to the first fundamental frequency carrier wave, obtains ranging base
Frequency modulation；The Doppler frequency shift that the controlled NCO module 14 is measured based on the capturing carrier and tracking module 11
Downlink low frequency carrier signal is generated, the Corticofugal Modulation of Somatosensory module 16 is then input to；The remote control demodulation module 13 is received from the load
The baseband signal that wave capture and tracking module 11 export, further therefrom demodulates remote signal and is input to the interface module
17；The telemetering modulation module 15 receives telemetry from the interface module 17, and the telemetry is modulated to the second base
Frequency carrier wave obtains telemetering fundamental frequency modulated signal；The downlink that the Corticofugal Modulation of Somatosensory module 16 is inputted using the controlled NCO module 14
The ranging fundamental frequency modulated signal and telemetering fundamental frequency modulated signal are modulated to the downlink low frequency carrier signal by low frequency carrier signal respectively,
It is then output to D/A converter 22 and is converted to downlink low frequency signal；The interface module 17 is then received from spaceborne controller 23
Monitoring signal is monitored the baseband processing unit 10, and the telemetry of the input from spaceborne controller 23,
The remote-control data is also output to the spaceborne controller 23.
On the basis of Fig. 1, Fig. 2 shows that the signal spectrum of uplink low frequency signal, abscissa f indicate frequency, ordinate p
It indicates power spectral density, is f0 which includes the frequency of uplink low frequency carrier signal, further includes frequency spectrum P1 and the remote control of distance measuring signal
The frequency spectrum P2 of signal.Further uplink low frequency carrier signal f0 is removed by above-mentioned capturing carrier and tracking module 11, and obtains base
Band signal, then distance measuring signal and remote signal are isolated from baseband signal, since the two signals occupy different frequency ranges, because
This can be separated by way of filtering.It can be seen that including two kinds of signal components in this uplink low frequency signal, one is to use
It is to be modulated on the same up-link carrier for being remotely controlled in ranging one, when reception carries out frequency spectrum separation again and may be implemented two
Kind function.
Further, Fig. 3 shows the frequency spectrum of distance measuring signal and telemetered signal by low frequency modulations, forwards mould in ranging
In block by distance measuring signal after being separated in base band, due to only make forwarding therefore the distance measuring signal first forwarded again be modulated to one it is low
First fundamental frequency carrier wave f1 of frequency, obtains ranging fundamental frequency modulated signal, the frequency spectrum of the signal is as shown in P3 in Fig. 3.In addition, telemetering
Telemetry is modulated to the second fundamental frequency carrier wave f2 by modulation module, obtains telemetering fundamental frequency modulated signal, the frequency spectrum of the signal such as Fig. 3
Shown in middle P4.
It is 2f0 that Fig. 4, which shows that controlled NCO module 14 has the frequency of downlink low frequency carrier signal, and Corticofugal Modulation of Somatosensory module should
Carrier wave modulates ranging fundamental frequency modulated signal and telemetering fundamental frequency modulated signal respectively, has obtained the frequency centered on downlink low frequency carrier signal
The modulated signal of rate, this modulated signal have included the frequency spectrum of the two signals, since fundamental frequency carrier wave is different, the two letters
Number after the modulation of downlink low frequency carrier signal, what spectrum component was still mutually isolated, therefore will not interfere, while also passing through
The same descending carrier is modulated transmission.In this way, with regard to modulation, there are two types of signals to carry out to issuing on the same descending carrier
It send, is equally beneficial for improving the utilization rate of frequency spectrum.
What is illustrated there are also some needs be exactly the frequency 2f0 of downlink low frequency carrier signal is nominal value, if low from the uplink
The carrier wave measurement of frequency signal obtains Doppler frequency shift fd, then also needs the frequency using Doppler frequency shift fd to downlink low frequency carrier signal
Rate 2f0 is modified, i.e. 2f0 ± kfd, and k is correction factor.Here movement velocity, the communication frequency of correction factor k and satellite
Related with the communication elevation angle, following formula is the calculating formula of Doppler frequency shift fd:
Fc is communication frequency, and v is the speed of related movement of satellite and ground installation, and φ is the communication elevation angle, and c is the light velocity.It is right
The frequency deviation of uplink signal goes to correct the frequency deviation of downlink signal again after carrying out accurate valuation, is conducive to ground installation reception, reduction pair
The Receiver Precision requirement of ground installation.
Preferably, as shown in figure 5, the capturing carrier and tracking module 11 include capturing carrier circuit 111 and carrier wave with
Track loop 112, the capturing carrier circuit 111 carry out capturing carrier to the uplink low frequency signal that converter 21 inputs and obtain standard
True Nonlinear Transformation in Frequency Offset Estimation value, i.e. Doppler frequency shift, and the Nonlinear Transformation in Frequency Offset Estimation value is input to the carrier tracking loop
112, carrier tracking loop 112 further carries out down coversion to the uplink low frequency signal of input and obtains baseband signal.Separately
Outside, which is also inputted in controlled NCO module.
Preferably, as shown in fig. 6, the capturing carrier circuit 111 includes sequentially connected first quadrature down converter
111A, decimation filter 111B, FFT calculator 111C, amplitude calculator 111D and appraising frequency bias 111E device, the converter
After the uplink low frequency signal of 21 pairs of inputs samples, quadrature frequency conversion is carried out by the first quadrature down converter 111A, with
And complex baseband signal is obtained after being handled by the decimation filter 111B filtering extraction, then by 111C pairs of the FFT calculator
The complex baseband signal does FFT calculating, and amplitude calculator 111D then further calculates corresponding range value to FFT calculated result,
The range value is averaging processing in appraising frequency bias device 111E, and the corresponding FFT index number of obtained amplitude peak peak value is i.e.
For corresponding offset estimation value, then the offset estimation value is input to the carrier tracking loop.The capturing carrier circuit
Local carrier generator 111F in 111 generates the orthogonal local carrier of two-way, this two-way quadrature carrier signals is expressed asWithThe frequency of this two-way quadrature carrier is generated according to nominal value, practical received uplink
The carrier frequency of low frequency signal would generally and the nominal value have deviation, this is also exactly that the capturing carrier circuit needs to carry out frequency deviation and estimates
Count the frequency deviation value to be estimated.
The signal-to-noise ratio of received uplink low frequency signal directly affects the performance of capturing carrier, in order to guarantee to compared with low signal-to-noise ratio
The accurate capture of signal needs to reduce the bandwidth of the uplink low frequency wave signal received, reduces the influence of the out-of-band noise of introducing,
But need to take into account simultaneously receive signal dynamic range, be based on this, here with above-mentioned FFT scheme realize to receive signal and
Row capture, realizes the initial estimation of carrier frequency offset.
Further, as shown in fig. 7, the carrier tracking loop includes the second local NCO112A, the second quadrature frequency conversion
Device 112B, low-pass filter 112C and loop filter 112D, the second local NCO receive the capturing carrier circuit output
Offset estimation value correct the quadrature carrier signals of second local NCO output, and be input to the described second orthogonal lower change
Frequency device 112B carries out down coversion to the uplink low frequency signal after sampling, then obtains base by the low-pass filter 112C
Band signal, baseband signal exports all the way, and another way is local by being input to described second after loop filter 112D filtering again
NCO corrects the quadrature carrier signals of generation in real time.
The carrier tracking loop carries out quadrature frequency conversion to the uplink low frequency signal of input first, and the complex radical after frequency conversion is taken a message
It number contains close to the baseband carrier component (difference frequency component) of zero-frequency and close to 2f0's and frequency component, later respectively to the road IQ
Complex baseband signal carry out low-pass filtering, only baseband carrier component in filtered signal.Uplink low frequency signal uses PM tune
Mode processed is included apparent monophonic component in filtered baseband carrier signal, can be obtained with the carrier wave on the road direct sample Q
Sinusoidal phase characteristic is obtained, but the loop that sinuso sine protractor phase discriminator is constituted has retardation (hung-up) phenomenon, capture time can be made to become
It is long.So, it would be desirable to the carrier doppler frequency deviation pre-estimation of capturing carrier circuit in utilization assists the load of the second local NCO
Wave phaselocked loop enters lock.After overdeviation pre-estimation auxiliary, the carrier beat into loop filter can be very small, i.e. the frequency difference meeting
In the fast pull-in range for directly falling in the phaselocked loop of the second local NCO, so that phaselocked loop is quickly accomplished frequency acquisition and caught with phase
It obtains.To efficiently avoid retardation phenomenon.
Further, as shown in figure 8, the ranging forwarding module includes baseband low pass filters 121 and distance measuring signal tune
The baseband signal of device 122 processed, the carrier tracking loop output is input to the baseband low pass filters 121, further low pass
Filtering obtains the distance measuring signal, and distance measuring signal forwarding is then modulated to institute by the distance measuring signal modulator 122
The first fundamental frequency carrier wave is stated, the ranging fundamental frequency modulated signal is obtained and exports to Corticofugal Modulation of Somatosensory module.Here Fig. 2 and figure can be combined
3 explanation, be exactly in Fig. 2 distance measuring signal carrier wave is obtained after down coversion close to the baseband signal of zero intermediate frequency, pass through base band low pass
Filter 121 obtains obtaining distance measuring signal from the baseband signal, then by distance measuring signal modulator 122 by distance measuring signal into
One step is modulated to the first fundamental frequency carrier wave f1, obtains ranging fundamental frequency modulated signal, the corresponding frequency spectrum of the signal such as the P3 institute in Fig. 3
Show.
Further, as shown in figure 9, the remote control demodulation module further comprises remote control low-converter 131, remote control low pass
Filter 132, remote control FFT detector 133, Costas ring 134 and decision device 135, from carrier tracking loop output
Baseband signal is input to the remote control low-converter 131, obtains remote signal by quadrature frequency conversion, using remote control low pass filtered
After wave device 132 filters, FFT energy measuring is carried out to the capture sequence in the remote signal by remote control FFT detector 133, really
The initial time of the fixed remote signal, then capture and tracking are synchronized by the Costas ring 134, decision device 135 is then right
Each of remote signal data export remote-control data bit stream after making decisions.
The demodulation of remote signal is directed to burst transfer system, and physical-layer transmission architecture includes the capture sequence of 128 bits, example
Alternately such as 101010 ..., followed by several contactless transmission data cells.Here baseband signal is converted by quadrature frequency conversion
To after baseband I Q, the beginning that sequence determines telecontrol duty period by FFT energy measuring, starting are captured first with 1010 ...
Costas ring synchronizes capture and tracking.
Here, indicate that, to character rate sampled data stream after baseband signal down-sampling, bit timing estimation is counted first with r (i)
Calculate timing metric are as follows:
Then find initial position of the maximum timing metric position as burst frame, it may be assumed that
After bit timing determines, the modulation intelligence of synchronous head part in signal is received using known synchronous head sequence elimination,
That is:
R (i)=r (dopt+i)·PN*(i)i∈[0,N-1]
Further estimate Nonlinear Transformation in Frequency Offset Estimation value:
The range of the offset estimation is the 1/2 of bit rate, after obtaining offset estimation value, then does carrier frequency to synchronous head part
Inclined estimated value correction (phase rotation), it may be assumed that
Then calculate the carrier wave initial phase at frame start position:
After frequency deviation and phase estimation terminate, can in frame instruct data portion carry out carrier correction (phase rotation) and
Phase demodulating.
Further, as shown in Figure 10, the telemetering modulation module includes BPSK modulator 151, telemetering NCO152, multiplication
Device 153, the telemetry from interface module by the BPSK modulator 151 modulate after with telemetering NCO152 export second
Fundamental frequency carrier wave obtains telemetering fundamental frequency modulated signal after being multiplied by multiplier 153.
As shown in figure 11, the controlled NCO module includes switching switch 141 and DDS generator 142, the switching switch
141 control terminal 1411 is electrically connected with the interface module, the signal input part 1412 of the switching switch 141 and the frequency deviation
The signal output end 1413 of estimator electrical connection, the switching switch is electrically connected with the DDS generator 142, when the switching
When controlled carrier estimation value of the input from the frequency offset estimator of switch 141, the downlink that the DDS generator 142 generates is low
The frequency of frequency carrier wave be equal to reference value 2f0 and Nonlinear Transformation in Frequency Offset Estimation value fd correction value kfd's and/or it is poor, when switching switch
When the 141 controlled Nonlinear Transformation in Frequency Offset Estimation value closed from the frequency offset estimator, the downlink that the DDS generator 142 generates is low
The frequency of frequency carrier wave is equal to reference value 2f0.It can be seen that the Nonlinear Transformation in Frequency Offset Estimation of capturing carrier and tracking module to uplink signal
Value can be used for the correction to downlink signal Nonlinear Transformation in Frequency Offset Estimation value, to improve the carrier frequency capture of whole system and track reliable
Property.
Based on same design, the present invention also provides a kind of implementations of baseband processing method for spaceborne measuring and controlling equipment
Example, as shown in figure 12, which includes:
Step S101: processing uplink low frequency signal, to the received uplink low frequency signal after over-sampling, on described
The carrier wave of row low frequency signal is captured and is tracked, and the Doppler frequency shift of the carrier wave of the uplink low frequency signal is measured, will be described
Uplink low frequency signal down-converts to baseband signal；
Step S102: forwarding distance measuring signal isolates distance measuring signal from the baseband signal, then by the distance measuring signal
Forwarding is modulated to the first fundamental frequency carrier wave, obtains ranging fundamental frequency modulated signal；
Step S103: demodulation remote signal isolates remote signal from the baseband signal, then by the remote signal
It is demodulated to obtain remote-control data output；
Step S104: the telemetry from spaceborne controller is modulated to the second fundamental frequency carrier wave, obtained by modulation telemetered signal
To telemetering fundamental frequency modulated signal；
Step S105: modulation downlink low frequency signal, by the ranging fundamental frequency modulated signal and telemetering fundamental frequency modulated signal point
It is not modulated to downlink low frequency carrier signal, then carrying out digital-to-analogue conversion is downlink low frequency signal.
Based on same design, step S101 can be referred to aforementioned to Fig. 1 to the explanation of Fig. 7 embodiment.Wherein, locating
It manages in uplink low frequency signal, further comprises the capturing carrier and carrier track to uplink low frequency signal.
Preferably, in the capturing carrier to uplink low frequency signal, after being sampled to the uplink low frequency signal of input again
Quadrature frequency conversion is carried out, and obtains complex baseband signal after carrying out filtering extraction processing, FFT then is done to the complex baseband signal
It calculates, then corresponding range value is calculated to FFT calculated result, then the range value is averaging processing, obtained maximum
The corresponding FFT index number of amplitude peak is corresponding offset estimation value.Can with the explanation of reference pair embodiment illustrated in fig. 6,
Which is not described herein again.
It preferably, is that load is corrected using the offset estimation value first in the carrier track to uplink low frequency signal
Quadrature carrier signals in wave tracking, and the uplink low frequency signal after sampling is carried out down using the quadrature carrier signals
Then frequency conversion obtains baseband signal after low-pass filtering, wherein all the way baseband signal export, another way baseband signal using
The quadrature carrier signals are corrected in real time after loop filtering.It can be with the explanation of reference pair embodiment illustrated in fig. 7, here not
It repeats again.
Preferably, for being obtained in step S102 forwarding distance measuring signal, including after carrying out low-pass filtering to the baseband signal
To the distance measuring signal, distance measuring signal forwarding is then modulated to the first fundamental frequency carrier wave again, obtains the ranging fundamental frequency tune
Signal processed.Can be with the explanation of reference pair embodiment illustrated in fig. 8, which is not described herein again.
Preferably, step S103 is demodulated in remote signal, including carrying out quadrature frequency conversion to the baseband signal of input
Remote signal is obtained, after low-pass filtering, FFT energy measuring is carried out to the capture sequence in the remote signal, is determined
The initial time of the remote signal, after synchronizing capture and tracking by Costas ring, then to each of remote signal
Data export remote-control data after making decisions.Can be with the explanation of reference pair embodiment illustrated in fig. 9, which is not described herein again.
Preferably, in step S104 modulation telemetered signal, after the telemetry first carries out BPSK modulation, with described the
Telemetering fundamental frequency modulated signal is obtained after two fundamental frequency carrier multiplications.It can be with the explanation of reference pair embodiment illustrated in fig. 10, here no longer
It repeats.
Preferably, in step S105 modulation downlink low frequency signal, the downlink low frequency carrier signal is generated by DDS generator,
And the frequency values for the downlink low frequency carrier signal that the DDS generator generates are controlled be equal to reference value or be equal to reference value with
It is the correction value of Nonlinear Transformation in Frequency Offset Estimation value and/or poor.Can be with the explanation of reference pair embodiment illustrated in fig. 11, which is not described herein again.
It can be seen that the invention discloses a kind of baseband processing methods for spaceborne measuring and controlling equipment.The Base-Band Processing side
Method includes: processing uplink low frequency signal, forwarding distance measuring signal, demodulation remote signal, modulation telemetered signal and modulation downlink low frequency
Signal, wherein baseband signal is down-converted to by handling uplink low frequency signal, and measure the carrier wave of uplink low frequency signal
Doppler frequency shift isolates distance measuring signal in forwarding distance measuring signal, and generates ranging fundamental frequency modulated signal, in demodulation remote control letter
Remote signal is isolated in number, demodulation obtains remote-control data, and telemetry is modulated into telemetering fundamental frequency in modulation telemetered signal
Then modulated signal under modulation modulates ranging fundamental frequency modulated signal and telemetering fundamental frequency modulated signal in row low frequency signal respectively
To downlink low frequency carrier signal, then carrying out digital-to-analogue conversion is downlink low frequency signal.Uplink signal may be implemented in method through this process
With effective being connected of downlink signal processing, multi-signal can cooperate when handling, and be conducive to improve signal spectrum utilization rate
And signal reception.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure transformation made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant technical fields,
Similarly it is included within the scope of the present invention.
Claims (7)
1. a kind of baseband processing method for spaceborne measuring and controlling equipment, which is characterized in that the baseband processing method includes:
Handle uplink low frequency signal, to the received uplink low frequency signal after over-sampling, to the uplink low frequency signal into
Row capturing carrier and carrier track, measure the Doppler frequency shift of the carrier wave of the uplink low frequency signal, and by the uplink low frequency
Signal down-converts to baseband signal；
Distance measuring signal is forwarded, isolates distance measuring signal from the baseband signal, then distance measuring signal forwarding is modulated to the
One fundamental frequency carrier wave obtains ranging fundamental frequency modulated signal；
Remote signal is demodulated, remote signal is isolated from the baseband signal, then the remote signal is demodulated to obtain
Remote-control data output；
Telemetered signal is modulated, the telemetry from spaceborne controller is modulated to the second fundamental frequency carrier wave, obtains telemetering fundamental frequency tune
Signal processed；
Downlink low frequency signal is modulated, it is low that the ranging fundamental frequency modulated signal and telemetering fundamental frequency modulated signal are modulated to downlink respectively
Frequency carrier wave, then carrying out digital-to-analogue conversion is downlink low frequency signal.
2. the baseband processing method according to claim 1 for spaceborne measuring and controlling equipment, which is characterized in that low to uplink
In the capturing carrier of frequency signal, including carrying out quadrature frequency conversion, Yi Jijin again after sampling to the uplink low frequency signal of input
Complex baseband signal is obtained after the processing of row filtering extraction, FFT calculating then is done to the complex baseband signal, then to FFT calculated result
Corresponding range value is calculated, then the range value is averaging processing, the corresponding FFT index of obtained amplitude peak peak value
Serial number is corresponding offset estimation value.
3. the baseband processing method according to claim 2 for spaceborne measuring and controlling equipment, which is characterized in that low to uplink
In the carrier track of frequency signal, be first the quadrature carrier signals in carrier track are corrected using the offset estimation value, and
Down coversion is carried out to the uplink low frequency signal after sampling using the quadrature carrier signals, then after low-pass filtering
To baseband signal, wherein all the way baseband signal export, another way baseband signal using after loop filtering to the quadrature carrier
Signal is corrected in real time.
4. the baseband processing method according to claim 3 for spaceborne measuring and controlling equipment, which is characterized in that in the forwarding
The distance measuring signal is obtained in distance measuring signal, including after carrying out low-pass filtering to the baseband signal, then again by the ranging
Signal forwarding is modulated to the first fundamental frequency carrier wave, obtains the ranging fundamental frequency modulated signal.
5. the baseband processing method according to claim 4 for spaceborne measuring and controlling equipment, which is characterized in that in the demodulation
In remote signal, remote signal is obtained including carrying out quadrature frequency conversion to the baseband signal of input, it is right after low-pass filtering
Capture sequence in the remote signal carries out FFT energy measuring, the initial time of the remote signal is determined, by Costas ring
Remote-control data is exported after synchronizing capture and tracking, then after making decisions to each of remote signal data.
6. the baseband processing method according to claim 5 for spaceborne measuring and controlling equipment, which is characterized in that in the modulation
In telemetered signal, after the telemetry first carries out BPSK modulation, and telemetering fundamental frequency is obtained after the second fundamental frequency carrier multiplication
Modulated signal.
7. the baseband processing method according to claim 6 for spaceborne measuring and controlling equipment, which is characterized in that in the modulation
In downlink low frequency signal, the downlink low frequency carrier signal is generated by DDS generator, and the DDS generator generate it is described under
The frequency values of row low frequency carrier signal it is controlled equal to reference value or equal to reference value and Nonlinear Transformation in Frequency Offset Estimation value correction value and/or
Difference.
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