CN209030248U - A kind of baseband processing unit for spaceborne measuring and controlling equipment - Google Patents
A kind of baseband processing unit for spaceborne measuring and controlling equipment Download PDFInfo
- Publication number
- CN209030248U CN209030248U CN201822177106.5U CN201822177106U CN209030248U CN 209030248 U CN209030248 U CN 209030248U CN 201822177106 U CN201822177106 U CN 201822177106U CN 209030248 U CN209030248 U CN 209030248U
- Authority
- CN
- China
- Prior art keywords
- signal
- module
- frequency
- carrier
- baseband
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The utility model discloses the baseband processing units for spaceborne measuring and controlling equipment.The baseband processing unit includes capturing carrier and tracking module, ranging forwarding module, it is remotely controlled demodulation module, controlled NCO module, telemetering modulation module, Corticofugal Modulation of Somatosensory module and interface module, these modules are realized in programmable digital circuit, wherein capturing carrier and tracking module receive uplink low frequency signal, therefrom isolate distance measuring signal and remote signal, it is exported respectively again to ranging forwarding module and remote control demodulation module, controlled NCO module exports downlink low frequency carrier signal to Corticofugal Modulation of Somatosensory module, the ranging fundamental frequency modulated signal to the output of distance measuring signal forwarding module and the telemetering fundamental frequency modulated signal of telemetering modulation module output are modulated again, interface module receives the monitoring signal from spaceborne controller.The baseband processing unit integrated level is high, versatile, realizes the processing to multi-signal, is suitable for minimizing spaceborne measuring and controlling equipment.
Description
Technical field
The utility model relates to satellite communication field more particularly to a kind of Base-Band Processing lists for spaceborne measuring and controlling equipment
Member.
Background technique
In the baseband processing unit of spaceborne measuring and controlling equipment, it usually needs processing multi-signal, it is existing that uplink signal is connect
Demodulation is received, also has the modulation to downlink signal to send, and is usually by multiple modules independent of each other in baseband processing unit
It is handled respectively, such the space occupied is big, the route connected between each other is also more, is unfavorable for miniaturization, integrated
Application demand.
Accordingly, it is desirable to provide a kind of baseband processing unit that the integrated level with multi-signal processing capacity is high.
Utility model content
The utility model mainly solving the technical problems that provide a kind of baseband processing unit for spaceborne measuring and controlling equipment,
Solve that spaceborne measuring and controlling equipment baseband processing unit in the prior art has a single function, integrated level is low, is difficult to the problems such as minimizing.
In order to solve the above technical problems, the technical solution that the utility model uses is to provide one kind for spaceborne observing and controlling
The baseband processing unit of equipment, including capturing carrier and tracking module, ranging forwarding module, remote control demodulation module, controlled NCO mould
Block, telemetering modulation module, Corticofugal Modulation of Somatosensory module and interface module；Uplink low frequency signal from data feedback channel circuit turns by AD
Parallel operation sampling after be input to the capturing carrier and tracking module, to the carrier wave of the uplink low frequency signal carry out capture and with
Track measures the Doppler frequency shift of the carrier wave of the uplink low frequency signal, and the uplink low frequency signal is down-converted to baseband signal；
The ranging forwarding module receives the baseband signal of the capturing carrier and tracking module output, obtains from the baseband signal
Distance measuring signal, then distance measuring signal forwarding is modulated to the first fundamental frequency carrier wave, obtain ranging fundamental frequency modulated signal；It is described controlled
NCO module generates downlink low frequency carrier signal, is then input to the Corticofugal Modulation of Somatosensory module；The remote control demodulation module is received from described
The baseband signal of capturing carrier and tracking module output, further therefrom demodulates remote-control data and is input to the interface mould
Block；The telemetering modulation module receives telemetry from the interface module, and the telemetry is modulated to the second fundamental frequency and is carried
Wave obtains telemetering fundamental frequency modulated signal；The Corticofugal Modulation of Somatosensory module is carried using the downlink low frequency of the controlled NCO module input
The ranging fundamental frequency modulated signal and telemetering fundamental frequency modulated signal are modulated to the downlink low frequency carrier signal by wave respectively, then defeated
D/A converter is arrived out is converted to downlink low frequency signal；The interface module then receives the monitoring signal from spaceborne controller, right
Each comprising modules of the baseband processing unit are monitored, and the telemetry of the input from spaceborne controller, also
The remote-control data is output to the spaceborne controller.
The utility model for spaceborne measuring and controlling equipment another embodiment of baseband processing unit in, the capturing carrier and
Tracking module includes capturing carrier circuit and carrier tracking loop, and the capturing carrier circuit inputs the converter upper
Row low frequency signal carries out capturing carrier and obtains accurate Nonlinear Transformation in Frequency Offset Estimation value, and the Nonlinear Transformation in Frequency Offset Estimation value is input to institute
Carrier tracking loop is stated, the carrier tracking loop further carries out down coversion to the uplink low frequency signal of input and obtains
Baseband signal.
In baseband processing unit another embodiment of the utility model for spaceborne measuring and controlling equipment, by the capturing carrier
The Nonlinear Transformation in Frequency Offset Estimation value that circuit generates is also inputted in controlled NCO module, and the controlled NCO module is based on the carrier wave
Offset estimation value is modified the frequency of the downlink low frequency carrier signal.
In baseband processing unit another embodiment of the utility model for spaceborne measuring and controlling equipment, the capturing carrier electricity
Road includes sequentially connected first quadrature down converter, decimation filter, FFT calculator, amplitude calculator and appraising frequency bias device,
After the converter samples the uplink low frequency signal of input, by the first quadrature down converter 111A row it is orthogonal under
Frequency conversion, and complex baseband signal is obtained after being handled by the decimation filter filtering extraction, then by the FFT calculator to institute
It states complex baseband signal and does FFT calculating, amplitude calculator then further calculates corresponding range value to FFT calculated result, and frequency deviation is estimated
It calculates device the range value is averaging processing, the corresponding FFT index number of obtained amplitude peak peak value is corresponding frequency
Inclined estimated value, then the offset estimation value is input to the carrier tracking loop.
In baseband processing unit another embodiment of the utility model for spaceborne measuring and controlling equipment, the carrier tracking loop
Road includes the second local NCO, the second quadrature down converter, low-pass filter and loop filter, and the second local NCO is received
The offset estimation value of the capturing carrier circuit output corrects the quadrature carrier signals of second local NCO output, and defeated
Enter to the second quadrature down converter B and down coversion is carried out to the uplink low frequency signal after sampling, then by described low
Bandpass filter obtains baseband signal, and baseband signal exports all the way, and another way is again by being input to institute after loop filter filtering
The second local NCO is stated, the quadrature carrier signals of generation are corrected in real time.
In baseband processing unit another embodiment of the utility model for spaceborne measuring and controlling equipment, the ranging forwards mould
Block includes baseband low pass filters and distance measuring signal modulator, and the baseband signal of the carrier tracking loop output is input to described
Baseband low pass filters, further low-pass filtering obtain the distance measuring signal, then pass through the distance measuring signal modulator for institute
It states distance measuring signal forwarding and is modulated to the first fundamental frequency carrier wave, obtain the ranging fundamental frequency modulated signal and export to Corticofugal Modulation of Somatosensory mould
Block.
In baseband processing unit another embodiment of the utility model for spaceborne measuring and controlling equipment, the remote control solves mode transfer
Block further comprises remote control low-converter, remote control low-pass filter, remote control FFT detector, Costas ring and decision device, comes from institute
The baseband signal for stating carrier tracking loop output is input to the remote control low-converter, obtains remote control letter by quadrature frequency conversion
Number, after remote control low-pass filter filtering, the capture sequence in the remote signal is carried out by remote control FFT detector
FFT energy measuring determines the initial time of the remote signal, then synchronizes capture and tracking by the Costas ring, sentences
Remote-control data bit stream is exported after certainly device then makes decisions each of remote signal data.
In baseband processing unit another embodiment of the utility model for spaceborne measuring and controlling equipment, mould is modulated in the telemetering
Block includes BPSK modulator, telemetering NCO, multiplier, and the telemetry from the interface module passes through the BPSK modulator
After modulation, telemetering fundamental frequency modulated signal is obtained after being multiplied with the second fundamental frequency carrier wave of telemetering NCO output by multiplier.
In baseband processing unit another embodiment of the utility model for spaceborne measuring and controlling equipment, the controlled NCO mould
Block includes switching switch and DDS generator, and the control terminal of the switching switch is electrically connected with the interface module, and the switching is opened
The signal input part of pass is electrically connected with the appraising frequency bias device, the signal output end and the DDS generator of the switching switch
Electrical connection, when the controlled Nonlinear Transformation in Frequency Offset Estimation value inputted from the frequency offset estimator of the switching switch, the DDS occurs
The frequency for the downlink low frequency carrier signal that device generates be equal to it is reference value and Nonlinear Transformation in Frequency Offset Estimation value correction value and/or poor, when the switching
When switching Nonlinear Transformation in Frequency Offset Estimation value of the controlled closing from the frequency offset estimator, the downlink low frequency of the DDS generator generation
The frequency of carrier wave is equal to reference value.
The beneficial effects of the utility model are: the utility model discloses the Base-Band Processing lists for spaceborne measuring and controlling equipment
Member.The baseband processing unit includes capturing carrier and tracking module, ranging forwarding module, remote control demodulation module, controlled NCO mould
Block, telemetering modulation module, Corticofugal Modulation of Somatosensory module and interface module, these modules are realized in programmable digital circuit,
Wherein capturing carrier and tracking module receive uplink low frequency signal, therefrom isolate distance measuring signal and remote signal, then defeated respectively
Out to ranging forwarding module and remote control demodulation module, controlled NCO module exports downlink low frequency carrier signal to Corticofugal Modulation of Somatosensory module, then right
Distance measuring signal forwarding module output ranging fundamental frequency modulated signal and telemetering modulation module output telemetering fundamental frequency modulated signal into
Row modulation, interface module receive the monitoring signal from spaceborne controller.The baseband processing unit integrated level is high, versatile,
The processing to multi-signal is realized, is suitable for minimizing spaceborne measuring and controlling equipment.
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 for the capturing carrier circuit composition in one embodiment of baseband processing unit of spaceborne measuring and controlling equipment
Figure；
Fig. 7 is according to for the carrier tracking circuit composition in one embodiment of baseband processing unit of spaceborne measuring and controlling equipment
Figure；
Fig. 8 is according to for the ranging forwarding module composition in one embodiment of baseband processing unit of spaceborne measuring and controlling equipment
Figure；
Fig. 9 is according to for the remote control demodulation module composition in one embodiment of baseband processing unit of spaceborne measuring and controlling equipment
Figure；
Figure 10 is according to for the telemetering modulation module composition in one embodiment of baseband processing unit of spaceborne measuring and controlling equipment
Figure；
Figure 11 is the controlled NCO module composition figure according to one embodiment of baseband processing unit for spaceborne measuring and controlling equipment.
Specific embodiment
For the ease of understanding the utility model, in the following with reference to the drawings and specific embodiments, the utility model is carried out more detailed
Thin explanation.The preferred embodiment of the utility model is given in attached drawing.But the utility model can be with many different
Form is realized, however it is not limited to this specification described embodiment.On the contrary, purpose of providing these embodiments is makes to this
The understanding of the disclosure of utility model is 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 utility model is identical.In the used in the description of the utility model
Term be only for the purpose of describing specific embodiments be not intended to limitation the utility model.Used in this specification
Term "and/or" includes any and all combinations of one or more related listed items.
Fig. 1 shows composition block diagram of the utility model for one embodiment of baseband processing unit of spaceborne measuring and controlling equipment.
In Fig. 1, which 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；From data feedback channel circuit
Uplink low frequency signal is input to the capturing carrier and tracking module 11 after the sampling of converter 21, to the uplink low frequency
The carrier wave of signal is captured and is tracked, and the Doppler frequency shift of the carrier wave of the uplink low frequency signal is measured, and the uplink is low
Frequency signal down-converts to baseband signal；The ranging forwarding module 12 receives the base that the capturing carrier and tracking module 11 export
Band signal obtains distance measuring signal from the baseband signal, then distance measuring signal forwarding is modulated to the first fundamental frequency carrier wave, obtains
To ranging fundamental frequency modulated signal；The controlled NCO module 14 is measured described more based on the capturing carrier and tracking module 11
General Le frequency displacement generates downlink low frequency carrier signal, is then input to the Corticofugal Modulation of Somatosensory module 16；The remote control demodulation module 13 receives
The baseband signal exported from the capturing carrier and tracking module 11 further therefrom demodulates remote-control data and is input to described
Interface module 17；The telemetering modulation module 15 receives telemetry from the interface module 17, and the telemetry is modulated
To the second fundamental frequency carrier wave, telemetering fundamental frequency modulated signal is obtained；The Corticofugal Modulation of Somatosensory module 16 is defeated using the controlled NCO module 14
It is low to be modulated to the downlink by the downlink low frequency carrier signal entered respectively for the ranging fundamental frequency modulated signal and telemetering fundamental frequency modulated signal
Frequency carrier wave 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 control
The monitoring signal of device 23 processed is monitored the baseband processing unit 10, and input is from described in spaceborne controller 23
The remote-control data is also output to the spaceborne controller 23 by telemetry.
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, it is practical it is received on
The carrier frequency of row low frequency signal would generally and the nominal value have deviation, this also be exactly the capturing carrier circuit need to carry out frequency deviation
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.
It can be seen that the utility model includes capturing carrier and tracking mould for the baseband processing unit of spaceborne measuring and controlling equipment
Block, ranging forwarding module, remote control demodulation module, controlled NCO module, telemetering modulation module, Corticofugal Modulation of Somatosensory module and interface module,
These modules are realized in programmable digital circuit, and wherein capturing carrier and tracking module receive uplink low frequency signal,
Distance measuring signal and remote signal are therefrom isolated, then is exported respectively to ranging forwarding module and remote control demodulation module, controlled NCO mould
Block export downlink low frequency carrier signal to Corticofugal Modulation of Somatosensory module, then to distance measuring signal forwarding module output ranging fundamental frequency modulated signal with
The telemetering fundamental frequency modulated signal of telemetering modulation module output is modulated, and interface module receives the monitoring letter from spaceborne controller
Number.The baseband processing unit integrated level is high, versatile, realizes the processing to multi-signal, is suitable for minimizing spaceborne survey
Control equipment.
The above description is only the embodiments of the present invention, and therefore it does not limit the scope of the patent of the utility model, all
Equivalent structure transformation made based on the specification and figures of the utility model, it is relevant to be applied directly or indirectly in other
Technical field is also included in the patent protection scope of the utility model.
Claims (9)
1. a kind of baseband processing unit for spaceborne measuring and controlling equipment, which is characterized in that the baseband processing unit includes carrier wave
Capture and tracking module, ranging forwarding module, remote control demodulation module, controlled NCO module, telemetering modulation module, Corticofugal Modulation of Somatosensory mould
Block and interface module；Uplink low frequency signal from data feedback channel circuit is input to the carrier wave after converter samples and catches
It obtains and tracking module, the carrier wave of the uplink low frequency signal is captured and tracked, the load of the uplink low frequency signal is measured
The Doppler frequency shift of wave, and the uplink low frequency signal is down-converted into baseband signal；Described in the ranging forwarding module receives
The baseband signal of capturing carrier and tracking module output, obtains distance measuring signal, then the ranging is believed from the baseband signal
Number forwarding is modulated to the first fundamental frequency carrier wave, obtains ranging fundamental frequency modulated signal；The controlled NCO module generates downlink low frequency and carries
Wave is then input to the Corticofugal Modulation of Somatosensory module；The remote control demodulation module receives defeated from the capturing carrier and tracking module
Baseband signal out further therefrom demodulates remote-control data and is input to the interface module；The telemetering modulation module from
The interface module receives telemetry, and the telemetry is modulated to the second fundamental frequency carrier wave, obtains telemetering fundamental frequency modulation letter
Number；The ranging fundamental frequency is modulated and is believed using the downlink low frequency carrier signal of the controlled NCO module input by the Corticofugal Modulation of Somatosensory module
Number and telemetering fundamental frequency modulated signal be modulated to the downlink low frequency carrier signal respectively, being then output to D/A converter, to be converted to downlink low
Frequency signal；The interface module then receives the monitoring signal from spaceborne controller, to each composition of the baseband processing unit
Module is monitored, and the telemetry of the input from spaceborne controller, also the remote-control data is output to described
Spaceborne controller.
2. the baseband processing unit according to claim 1 for spaceborne measuring and controlling equipment, which is characterized in that the carrier wave is caught
Obtaining with tracking module includes capturing carrier circuit and carrier tracking loop, and the capturing carrier circuit inputs the converter
Uplink low frequency signal carry out capturing carrier and obtain accurate Nonlinear Transformation in Frequency Offset Estimation value, and the Nonlinear Transformation in Frequency Offset Estimation value is inputted
To the carrier tracking loop, the carrier tracking loop down coversion further carried out to the uplink low frequency signal of input and
Obtain baseband signal.
3. the baseband processing unit according to claim 2 for spaceborne measuring and controlling equipment, which is characterized in that by the carrier wave
The Nonlinear Transformation in Frequency Offset Estimation value that capture circuit generates is also inputted in controlled NCO module, and the controlled NCO module is based on described
Nonlinear Transformation in Frequency Offset Estimation value is modified the frequency of the downlink low frequency carrier signal.
4. the baseband processing unit according to claim 2 for spaceborne measuring and controlling equipment, which is characterized in that the carrier wave is caught
Obtaining circuit includes that sequentially connected first quadrature down converter, decimation filter, FFT calculator, amplitude calculator and frequency deviation are estimated
Device is calculated, after the converter samples the uplink low frequency signal of input, by the first quadrature down converter 111A row
Quadrature frequency conversion, and complex baseband signal is obtained after being handled by the decimation filter filtering extraction, then calculated by the FFT
Device does FFT calculating to the complex baseband signal, and amplitude calculator then further calculates corresponding range value to FFT calculated result,
The range value is averaging processing in appraising frequency bias device, and the corresponding FFT index number of obtained amplitude peak peak value is pair
The Nonlinear Transformation in Frequency Offset Estimation value answered, then the Nonlinear Transformation in Frequency Offset Estimation value is input to the carrier tracking loop.
5. the baseband processing unit according to claim 2 for spaceborne measuring and controlling equipment, which is characterized in that the carrier wave with
Track loop includes the second local NCO, the second quadrature down converter, low-pass filter and loop filter, the second local NCO
The offset estimation value of the capturing carrier circuit output is received to correct the quadrature carrier signals of second local NCO output,
And be input to second quadrature down converter and down coversion is carried out to the uplink low frequency signal after sampling, then by described
Low-pass filter obtains baseband signal, and baseband signal exports all the way, and another way after loop filter filtering again by being input to
The second local NCO, corrects the quadrature carrier signals of generation in real time.
6. the baseband processing unit according to claim 5 for spaceborne measuring and controlling equipment, which is characterized in that the ranging turns
Hair module includes baseband low pass filters and distance measuring signal modulator, and the baseband signal of the carrier tracking loop output is input to
The baseband low pass filters, further low-pass filtering obtain the distance measuring signal, then pass through the distance measuring signal modulator
Distance measuring signal forwarding is modulated to the first fundamental frequency carrier wave, the ranging fundamental frequency modulated signal is obtained and exports to downlink tune
Molding block.
7. the baseband processing unit according to claim 2 for spaceborne measuring and controlling equipment, which is characterized in that the remote control solution
Mode transfer block further comprises remote control low-converter, remote control low-pass filter, remote control FFT detector, Costas ring and decision device, is come
The baseband signal exported from the carrier tracking loop is input to the remote control low-converter, is remotely controlled by quadrature frequency conversion
Signal carries out the capture sequence in the remote signal by remote control FFT detector after remote control low-pass filter filtering
FFT energy measuring determines the initial time of the remote signal, then synchronizes capture and tracking by the Costas ring, sentences
Remote-control data bit stream is exported after certainly device then makes decisions each of remote signal data.
8. the baseband processing unit according to claim 2 for spaceborne measuring and controlling equipment, which is characterized in that the telemetering tune
Molding block includes BPSK modulator, telemetering NCO, multiplier, and the telemetry from the interface module passes through the BPSK tune
After device modulation processed, telemetering fundamental frequency modulated signal is obtained after being multiplied with the second fundamental frequency carrier wave of telemetering NCO output by multiplier.
9. the baseband processing unit according to claim 4 for spaceborne measuring and controlling equipment, which is characterized in that described controlled
NCO module includes switching switch and DDS generator, and the control terminal of the switching switch is electrically connected with the interface module, described
The signal input part of switching switch is electrically connected with the appraising frequency bias device, the signal output end and the DDS of the switching switch
Generator electrical connection, it is described when the controlled Nonlinear Transformation in Frequency Offset Estimation value inputted from the frequency offset estimator of the switching switch
The frequency for the downlink low frequency carrier signal that DDS generator generates be equal to it is the correction value of reference value and Nonlinear Transformation in Frequency Offset Estimation value and/or poor,
When the controlled Nonlinear Transformation in Frequency Offset Estimation value closed from the frequency offset estimator of the switching switch, the DDS generator is generated
Downlink low frequency carrier signal frequency be equal to reference value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822177106.5U CN209030248U (en) | 2018-12-24 | 2018-12-24 | A kind of baseband processing unit for spaceborne measuring and controlling equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822177106.5U CN209030248U (en) | 2018-12-24 | 2018-12-24 | A kind of baseband processing unit for spaceborne measuring and controlling equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209030248U true CN209030248U (en) | 2019-06-25 |
Family
ID=66911089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822177106.5U Active CN209030248U (en) | 2018-12-24 | 2018-12-24 | A kind of baseband processing unit for spaceborne measuring and controlling equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209030248U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109525526A (en) * | 2018-12-24 | 2019-03-26 | 南京屹信航天科技有限公司 | A kind of baseband processing unit for spaceborne measuring and controlling equipment |
| CN116232426A (en) * | 2022-12-30 | 2023-06-06 | 西安空间无线电技术研究所 | Integrated design method for satellite-borne C/Ku frequency band measurement and control transponder |
-
2018
- 2018-12-24 CN CN201822177106.5U patent/CN209030248U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109525526A (en) * | 2018-12-24 | 2019-03-26 | 南京屹信航天科技有限公司 | A kind of baseband processing unit for spaceborne measuring and controlling equipment |
| CN109525526B (en) * | 2018-12-24 | 2024-05-28 | 南京屹信航天科技有限公司 | Baseband processing unit for satellite-borne measurement and control equipment |
| CN116232426A (en) * | 2022-12-30 | 2023-06-06 | 西安空间无线电技术研究所 | Integrated design method for satellite-borne C/Ku frequency band measurement and control transponder |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4338579A (en) | Frequency shift offset quadrature modulation and demodulation | |
| CN102025388B (en) | Emulational USB intermediate frequency responser used for satellite test and control | |
| CN109412635A (en) | A kind of spaceborne measuring and controlling equipment | |
| CN111343125B (en) | 32APSK modulation system receiver synchronization method | |
| CN107682293B (en) | Phase modulation signal frequency offset estimation and tracking method based on nonlinear transformation | |
| US4757319A (en) | Adaptive depolarization-interference-compensator | |
| CN109889195A (en) | Frequency locking ring assists phase locked loop fast lock method | |
| CN209030248U (en) | A kind of baseband processing unit for spaceborne measuring and controlling equipment | |
| CN107769816B (en) | Chirp spread spectrum communication system receiver time synchronization system and method | |
| CN105704081B (en) | Multiple offset carrier amplitude-modulated signals preferably and demodulation method | |
| CN104079518A (en) | Polarity diversity reception device and method based on SOQPSK-TG signal | |
| CN108270715A (en) | It is suitble to the carrier recovery system and method for high-order 4096-QAM | |
| CN102739590A (en) | CP-EBPSK communication system for pseudorandom sequence phase modulation and communication method thereof | |
| CN112187294B (en) | Configurable multi-frequency-point short burst spread spectrum signal receiving device | |
| US11206163B2 (en) | Radio frequency (RF) to digital polar data converter and time-to-digital converter based time domain signal processing receiver | |
| CN105515639A (en) | Universal satellite high-speed data transmission signal timing synchronization method | |
| CN110300079A (en) | A kind of msk signal coherent demodulation method and system | |
| CN106656400A (en) | Accurate frequency difference fast acquisition method in time delay jitter condition of PCMA system | |
| Lin et al. | A high data rate parallel demodulator suited to FPGA implementation | |
| CN209170366U (en) | A kind of spaceborne measuring and controlling equipment | |
| CN105407067B (en) | The coherent carrier of burst mode GMSK a kind of and the restoration methods of timing | |
| CN109474295A (en) | A kind of baseband processing method for spaceborne measuring and controlling equipment | |
| EP1388942B1 (en) | Conversion circuit, tuner and demodulator | |
| US9712211B2 (en) | Quadrature demodulator for a very high bit rate RFID receiver | |
| CN109525526A (en) | A kind of baseband processing unit for spaceborne measuring and controlling equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |