CN110505173A - A kind of simple catching method and device of big frequency deviation burst signal - Google Patents
A kind of simple catching method and device of big frequency deviation burst signal Download PDFInfo
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- CN110505173A CN110505173A CN201910929671.9A CN201910929671A CN110505173A CN 110505173 A CN110505173 A CN 110505173A CN 201910929671 A CN201910929671 A CN 201910929671A CN 110505173 A CN110505173 A CN 110505173A
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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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Abstract
The simple catching method and device of big frequency deviation burst signal, method include: to carry out frequency deviation precorrection processing to digital baseband signal according to the preset different precorrection frequency deviation values of each frequency deviation pre-processing channel respectively in multichannel frequency deviation pre-processing channel；The maximum data of peak value in the data of each frequency deviation pre-processing channel after selection frequency deviation precorrection processing, and carry the corresponding frequency deviation pre-processing channel information of the maximum data of peak value；The residual frequency deviation value of the corresponding frequency deviation pre-processing channel of the maximum data of peak value is estimated；Delay process is carried out to the digital baseband signal in initial data channel, realizes that treated that data delay is aligned with multichannel frequency deviation pre-processing channel completion frequency deviation precorrection；Pre- frequency-conversion processing is carried out according to residual frequency deviation value, corrects the frequency deviation value of the digital baseband signal in initial data channel；The digital baseband signal in the initial data channel after pre- frequency-conversion processing is filtered, is then captured.The anti-frequency deviation performance of channel and acquisition probability improve, and hardware cost and integrated difficulty reduce.
Description
Technical field
The present invention relates to technical field of satellite communication, especially the simple catching method and dress with a kind of big frequency deviation burst signal
Set correlation.
Background technique
Satellite link use transparent forwarding mode, ICBM SHF satellite terminal can internal loopback, the frequency deviation value size of entire satellite link
Mainly by the hardware clock of ICBM SHF satellite terminal, the intrinsic frequency deviation three of motion Doppler effect, satellite repeater is superimposed composition.Data-link
Inversely, the absolute frequency deviation value of data link is bigger, physics for the acquisition probability of absolute frequency deviation value and physical channel that pass enters
Channel acquisition probability is lower.Meanwhile physical channel acquisition probability and symbol bandwidth are proportional, certain in link frequency deviation value
In the case of, symbol bandwidth is smaller, and physical channel acquisition probability is lower.
In technical field of satellite communication, the existing related method for improving anti-frequency deviation region, improving acquisition probability has:
Patent publication No: 109743073 A of CN discloses the big frequency deviation Direct Sequence Spread Spectrum Fast synchronization side based on unique code
Method carries out relevant search by the corresponding difference sequence of known unique code frequency expansion sequence, by what is constantly accumulated caused by frequency deviation
Phase deviation becomes fixed skew, avoids big frequency deviation bring correlation peak loss, improves anti-frequency deviation performance and capture
Probability.Although this method improves anti-frequency deviation performance using difference sequence mode, inevitably introduced due to frequency deviation
Inband signaling damage, influences demodulation performance；
Patent publication No: 103543456 A of CN discloses a kind of based on the related big frequency deviation GNSS for combining FFT operation of segmentation
Signal acquisition methods combine FFT operation by the way that segmentation is related, carrier frequency can be completed while code phase serial search
Parallel search effectively shortens the capture time of big frequency deviation GNSS signal, improves acquisition probability.Although this method using
Segmentation relevant mode improves acquisition performance, but from algorithm level goes to improve performance space merely very limited, and realizes
Complexity will increase substantially.And solved from system level, clock accuracy will be also increased substantially, hardware cost is increased and integrates
Difficulty.
Summary of the invention
For deficiency existing for related art, the present invention proposes a kind of simple catching method of big frequency deviation burst signal
And device, the frequency deviation precorrection of more gradients is carried out to received signal using multiple digital channels, improves the anti-frequency of entire channel
Bias energy and acquisition probability, system dependency degree is low, reduces system hardware cost and integrated difficulty.
To achieve the goals above, the present invention uses following technology:
A kind of simple catching method of big frequency deviation burst signal, which is characterized in that comprising steps of
By initial data channel all the way and multichannel frequency deviation pre-processing channel respectively to satellite downlink digital baseband signal into
Row receives；
Respectively according to the preset different precorrection frequencies of each frequency deviation pre-processing channel in the frequency deviation pre-processing channel described in multichannel
Bias carries out frequency deviation precorrection processing to the digital baseband signal；
The maximum data of peak value in the data of each frequency deviation pre-processing channel are chosen after frequency deviation precorrection processing, and are carried
The corresponding frequency deviation pre-processing channel information of the maximum data of peak value；
The residual frequency deviation value of the frequency deviation pre-processing channel corresponding to the maximum data of the peak value is estimated；
Delay process is carried out to the digital baseband signal in the initial data channel, is realized and frequency deviation pre-processing channel described in multichannel
Complete the frequency deviation precorrection treated data delay alignment；
The residual frequency deviation value obtained according to estimation believes the digital baseband in the initial data channel for completing delay alignment
Number pre- frequency-conversion processing is carried out, corrects the frequency deviation value of the digital baseband signal in the initial data channel；
The digital baseband signal in the initial data channel after the pre- frequency-conversion processing is filtered, is then captured.
Further, the satellite downlink digital baseband signal is to be put by satellite downlink signals through analog device
Greatly, it is obtained after filtering, frequency conversion, analog-to-digital conversion.
Further, the frequency deviation precorrection processing, comprising steps of
Frequency deviation is carried out to the digital baseband signal according to each frequency deviation pre-processing channel preset different precorrection frequency deviation values
Precorrection processing；
Filtering processing to the frequency deviation precorrection treated digital baseband signal filter out out-of-band interference；
The digital baseband signal for filtering out out-of-band interference is captured.
Further, the different precorrection frequency deviation values, multichannel frequency deviation pre-processing channel is preset according to gradient.
By wherein the precorrection frequency deviation value of frequency deviation pre-processing channel is preset as zero all the way；
The precorrection frequency deviation value of other road frequency deviation pre-processing channels is preset as+n* Δ f or-n* Δ f, n > 0；
Wherein, Δ f is the original anti-frequency deviation region of satellite downlink digital baseband signal.
For example, being specifically, by initial data channel all the way and three tunnel frequency deviation pre-processing channels respectively to satellite downlink chain
Railway digital baseband signal is received；
Then the precorrection frequency deviation value of first via frequency deviation pre-processing channel is preset as+2* Δ f；
Then the precorrection frequency deviation value of the second tunnel frequency deviation pre-processing channel is preset as zero；
Then the precorrection frequency deviation value of third road frequency deviation pre-processing channel is preset as -2* Δ f.
A kind of simple acquisition equipment of big frequency deviation burst signal characterized by comprising
Multichannel frequency deviation pre-processing channel module has multichannel frequency deviation pre-processing channel, for received satellite downlink number
Word baseband signal, and it is preset different pre- according to each frequency deviation pre-processing channel respectively in each frequency deviation pre-processing channel
It corrects frequency deviation value and frequency deviation precorrection processing is carried out to the digital baseband signal；
Channel selecting module, for choosing after the frequency deviation precorrection processing peak value in the data of each frequency deviation pre-processing channel
Maximum data, and carry the corresponding frequency deviation pre-processing channel information of the maximum data of peak value；
Channel frequency offset estimation module, for the remaining frequency to the corresponding frequency deviation pre-processing channel of the maximum data of the peak value
Bias is estimated；
Initial data channel module has channel all the way, for prolonging to received satellite downlink digital baseband signal
When handle, realize that treated that data delay is aligned with the completion of frequency deviation pre-processing channel described in the multichannel frequency deviation precorrection；
Pre- frequency-variable module, the residual frequency deviation value for being obtained according to estimation are logical to the initial data for completing delay alignment
The digital baseband signal in road carries out pre- frequency-conversion processing, corrects the frequency deviation value of the digital baseband signal in the initial data channel；
Trapping module is filtered, is filtered for the digital baseband signal to the initial data channel after the pre- frequency-conversion processing
Then wave captures.
Include: per frequency deviation pre-processing channel all the way
Frequency deviation precorrection unit is used for according to the preset different precorrection frequency deviation values of each frequency deviation pre-processing channel to the number
Word baseband signal carries out frequency deviation precorrection processing；
Band filters out unit outside, for the filter to the frequency deviation precorrection treated digital baseband signal filter out out-of-band interference
Wave processing；
Capturing unit, for being captured to the digital baseband signal for filtering out out-of-band interference.
The beneficial effects of the invention are that:
1, the anti-capturing frequency deviation range of system is substantially improved, anti-deviation capability and frequency deviation precorrection number of vias are proportional.If former
The anti-frequency deviation region of system is ± Δ f, then the anti-capturing frequency deviation range of improved three tunnel frequency deviation pretreatment access can be promoted to ± 3*
Δf。
2, the signal of big frequency deviation carries out pre- frequency conversion, reduces signal and filters and the damage of bring inband signaling, improves system
Whole demodulation performance.
3, design structure is flexible, and scalability is strong, can be extended to precorrection access, further mention according to the actual situation
The anti-frequency deviation performance and acquisition probability of high system.
4, system dependency degree is low, reduces system hardware cost and integrated difficulty.
Detailed description of the invention
Fig. 1 is the method processing flow schematic diagram of the embodiment of the present application.
Fig. 2 is the structure drawing of device of the embodiment of the present application.
Fig. 3 is the embodiment of the present application per frequency deviation pre-processing channel structure chart all the way.
Specific embodiment
The present invention is explained in detail in embodiment with reference to the accompanying drawing.
The simple catching method embodiment process flow of the big frequency deviation burst signal of the application is as shown in Figure 1.
(1) satellite downlink signals obtain digital baseband letter after analog device amplification, filtering, frequency conversion, analog-to-digital conversion
Number.
(2) by initial data channel and multichannel frequency deviation pre-processing channel all the way respectively to satellite downlink digital baseband
Signal is received.
(3) preset different pre- according to each frequency deviation pre-processing channel respectively in the frequency deviation pre-processing channel described in multichannel
It corrects frequency deviation value and frequency deviation precorrection processing is carried out to the digital baseband signal.
Different precorrection frequency deviation values preset multichannel frequency deviation pre-processing channel according to gradient.
Such as: by wherein the precorrection frequency deviation value of frequency deviation pre-processing channel is preset as zero all the way；Other road frequency deviations are located in advance
The precorrection frequency deviation value in reason channel is preset as+n* Δ f or-n* Δ f, n > 0；Wherein, Δ f is satellite downlink digital baseband
The original anti-frequency deviation region of signal.
(4) to the filtering processing of the frequency deviation precorrection treated digital baseband signal filter out out-of-band interference.
(5) digital baseband signal for filtering out out-of-band interference is captured.
(6) the maximum data of peak value in the data of each frequency deviation pre-processing channel are chosen, and carry the peak value most
The corresponding frequency deviation pre-processing channel information of big data.
(7) the residual frequency deviation value of the frequency deviation pre-processing channel corresponding to the maximum data of the peak value is estimated.
(8) delay process is carried out to the digital baseband signal in the initial data channel, realized pre- with frequency deviation described in multichannel
Treatment channel completes the frequency deviation precorrection treated data delay alignment.
(9) number of the residual frequency deviation value obtained according to estimation to the initial data channel for completing delay alignment
Baseband signal carries out pre- frequency-conversion processing, corrects the frequency deviation value of the digital baseband signal in the initial data channel
(10) digital baseband signal in the initial data channel after the pre- frequency-conversion processing is filtered.
(11) it captures.
The simple acquisition equipment example structure of the big frequency deviation burst signal of the application is as shown in Figure 2.
Apparatus structure includes: to obtain satellite after analog device amplification, filtering, frequency conversion, analog-to-digital conversion for receiving
Down-link digital baseband signal multichannel frequency deviation pre-processing channel module and initial data channel module.
It further include channel selecting module, the channel frequency offset estimation module being connect with multichannel frequency deviation pre-processing channel module.
Further include the pre- frequency-variable module being connect with initial data channel module and channel frequency offset estimation module, and with it is pre-
The filtering trapping module of frequency-variable module connection.
Specifically, multichannel frequency deviation pre-processing channel module, has multichannel frequency deviation pre-processing channel, for received satellite
Down-link digital baseband signal, and it is pre- according to each frequency deviation pre-processing channel respectively in each frequency deviation pre-processing channel
If different precorrection frequency deviation values to the digital baseband signal carry out frequency deviation precorrection processing.
As shown in figure 3, including: per frequency deviation pre-processing channel all the way
Frequency deviation precorrection unit is used for according to the preset different precorrection frequency deviation values of each frequency deviation pre-processing channel to the number
Word baseband signal carries out frequency deviation precorrection processing；
Band filters out unit outside, for the filter to the frequency deviation precorrection treated digital baseband signal filter out out-of-band interference
Wave processing；
Capturing unit, for being captured to the digital baseband signal for filtering out out-of-band interference.
Specifically, channel selecting module, for choosing the number of each frequency deviation pre-processing channel after the frequency deviation precorrection is handled
According to the maximum data of middle peak value, and carry the corresponding frequency deviation pre-processing channel information of the maximum data of peak value.
Specifically, channel frequency offset estimation module, for the frequency deviation pretreatment corresponding to the maximum data of the peak value
The residual frequency deviation value in channel is estimated.
Specifically, initial data channel module, has channel all the way, for received satellite downlink digital baseband
Signal carries out delay process, realizes that treated that data are prolonged with the completion of frequency deviation pre-processing channel described in the multichannel frequency deviation precorrection
When be aligned.
Specifically, pre- frequency-variable module, the residual frequency deviation value for being obtained according to estimation is to the institute for completing delay alignment
The digital baseband signal for stating initial data channel carries out pre- frequency-conversion processing, corrects the digital baseband signal in the initial data channel
Frequency deviation value.
Specifically, filtering trapping module, for the digital base to the initial data channel after the pre- frequency-conversion processing
Band signal is filtered, and is then captured.
It illustrates
By taking triple channel frequency deviation precorrection as an example, it is assumed that the anti-frequency deviation region of original system is, using the side of the embodiment of the present application
Method or device are handled, and process flow is as shown in Figure 1.
Satellite downlink signals obtain digital baseband signal after analog device amplification, filtering, frequency conversion, analog-to-digital conversion.
Base band data after A/D is managed is divided into three tunnels: the first via corrects frequency deviation+2* Δ f, the second tunnel frequency deviation precorrection in advance
Value is set as zero, and third road corrects frequency deviation -2* Δ f in advance.The effect of the preparatory correction process access in three tunnels is preparatory correction base band
Setting frequency deviation in signal, the lesser access of residual frequency deviation value will have higher correlation peak, and channel selection unit is according to three
The peak value size of branch realizes the selection to channel data, and carries channel information simultaneously.
Three data is filtered, filters out out-of-band interference, while three data is through the pretreated residual frequency of overdeviation
The smaller branch of bias, after filtering, inband signaling damage is smaller, and out of band signal degree of suppression is higher.
Three road signals are captured respectively, by filtered processing signal, residual frequency departure value is smaller, and peak value is brighter
It is aobvious.
According to the size of peak value, the signal of three branches is chosen, it is maximum to choose peak value, and carries access letter simultaneously
Breath, for seeking frequency deviation total value.
According to access data and channel information is chosen, channel remnants/residual frequency departure estimation is carried out, the total of link data is both obtained
Frequency deviation value.
Delay process is done to the 4th road base band data, it is ensured that be aligned with the delay of above-mentioned three tunnels frequency deviation precorrection branch.
After the band data delay alignment of the 4th roadbed, pre- frequency conversion is carried out, corrects the frequency deviation value of raw baseband data, frequency deviation letter
Breath is integrated by offset estimation and channel information, and baseband signal that treated is remained without frequency deviation or lesser frequency deviation residual.
4th circuit-switched data is filtered after pre- frequency-conversion processing, filters out out-of-band interference, inband signaling damage compared with
It is small.
4th circuit-switched data is sent into capturing unit and is handled after pre- frequency conversion and filtering, and the base band data is because of residual frequency
Partially smaller, inband signaling damage is smaller, and frame synchronization probability is substantially improved, and completes capture.
Claims (10)
1. a kind of simple catching method of big frequency deviation burst signal, which is characterized in that comprising steps of
By initial data channel all the way and multichannel frequency deviation pre-processing channel respectively to satellite downlink digital baseband signal into
Row receives；
Respectively according to the preset different precorrection frequencies of each frequency deviation pre-processing channel in the frequency deviation pre-processing channel described in multichannel
Bias carries out frequency deviation precorrection processing to the digital baseband signal；
The maximum data of peak value in the data of each frequency deviation pre-processing channel are chosen after frequency deviation precorrection processing, and are carried
The corresponding frequency deviation pre-processing channel information of the maximum data of peak value；
The residual frequency deviation value of the frequency deviation pre-processing channel corresponding to the maximum data of the peak value is estimated；
Delay process is carried out to the digital baseband signal in the initial data channel, is realized and frequency deviation pre-processing channel described in multichannel
Complete the frequency deviation precorrection treated data delay alignment；
The residual frequency deviation value obtained according to estimation believes the digital baseband in the initial data channel for completing delay alignment
Number pre- frequency-conversion processing is carried out, corrects the frequency deviation value of the digital baseband signal in the initial data channel；
The digital baseband signal in the initial data channel after the pre- frequency-conversion processing is filtered, is then captured.
2. the simple catching method of big frequency deviation burst signal according to claim 1, it is characterised in that: the satellite downlink
Link digital baseband signal is obtained after analog device amplification, filtering, frequency conversion, analog-to-digital conversion by satellite downlink signals.
3. the simple catching method of big frequency deviation burst signal according to claim 1, it is characterised in that: the pre- school of frequency deviation
Positive processing, comprising steps of
Frequency deviation is carried out to the digital baseband signal according to each frequency deviation pre-processing channel preset different precorrection frequency deviation values
Precorrection processing；
Filtering processing to the frequency deviation precorrection treated digital baseband signal filter out out-of-band interference；
The digital baseband signal for filtering out out-of-band interference is captured.
4. the simple catching method of big frequency deviation burst signal according to claim 1, it is characterised in that: the pre- school of difference
Positive frequency deviation value presets multichannel frequency deviation pre-processing channel according to gradient.
5. the simple catching method of big frequency deviation burst signal according to claim 4, it is characterised in that:
By wherein the precorrection frequency deviation value of frequency deviation pre-processing channel is preset as zero all the way；
The precorrection frequency deviation value of other road frequency deviation pre-processing channels is preset as+n* Δ f or-n* Δ f, n > 0；
Wherein, Δ f is the original anti-frequency deviation region of satellite downlink digital baseband signal.
6. the simple catching method of big frequency deviation burst signal according to claim 4, it is characterised in that: by original all the way
Data channel and three tunnel frequency deviation pre-processing channels respectively receive satellite downlink digital baseband signal；
The precorrection frequency deviation value of first via frequency deviation pre-processing channel is preset as+2* Δ f；
The precorrection frequency deviation value of second tunnel frequency deviation pre-processing channel is preset as zero；
The precorrection frequency deviation value of third road frequency deviation pre-processing channel is preset as -2* Δ f.
7. a kind of simple acquisition equipment of big frequency deviation burst signal characterized by comprising
Multichannel frequency deviation pre-processing channel module has multichannel frequency deviation pre-processing channel, for received satellite downlink number
Word baseband signal, and it is preset different pre- according to each frequency deviation pre-processing channel respectively in each frequency deviation pre-processing channel
It corrects frequency deviation value and frequency deviation precorrection processing is carried out to the digital baseband signal；
Channel selecting module, for choosing after the frequency deviation precorrection processing peak value in the data of each frequency deviation pre-processing channel
Maximum data, and carry the corresponding frequency deviation pre-processing channel information of the maximum data of peak value；
Channel frequency offset estimation module, for the remaining frequency to the corresponding frequency deviation pre-processing channel of the maximum data of the peak value
Bias is estimated；
Initial data channel module has channel all the way, for prolonging to received satellite downlink digital baseband signal
When handle, realize that treated that data delay is aligned with the completion of frequency deviation pre-processing channel described in the multichannel frequency deviation precorrection；
Pre- frequency-variable module, the residual frequency deviation value for being obtained according to estimation are logical to the initial data for completing delay alignment
The digital baseband signal in road carries out pre- frequency-conversion processing, corrects the frequency deviation value of the digital baseband signal in the initial data channel；
Trapping module is filtered, is filtered for the digital baseband signal to the initial data channel after the pre- frequency-conversion processing
Then wave captures.
8. the simple acquisition equipment of big frequency deviation burst signal according to claim 7, it is characterised in that: the satellite downlink
Link digital baseband signal is obtained after analog device amplification, filtering, frequency conversion, analog-to-digital conversion by satellite downlink signals.
9. the simple acquisition equipment of big frequency deviation burst signal according to claim 7, it is characterised in that: pre- per frequency deviation all the way
Treatment channel includes:
Frequency deviation precorrection unit is used for according to the preset different precorrection frequency deviation values of each frequency deviation pre-processing channel to the number
Word baseband signal carries out frequency deviation precorrection processing；
Band filters out unit outside, for the filter to the frequency deviation precorrection treated digital baseband signal filter out out-of-band interference
Wave processing；
Capturing unit, for being captured to the digital baseband signal for filtering out out-of-band interference.
10. the simple acquisition equipment of big frequency deviation burst signal according to claim 7, it is characterised in that: described different pre-
Frequency deviation value is corrected, multichannel frequency deviation pre-processing channel is preset according to gradient.
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