CN104486275A - Data chain intermediate-frequency signal processing method - Google Patents
Data chain intermediate-frequency signal processing method Download PDFInfo
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- CN104486275A CN104486275A CN201410764632.5A CN201410764632A CN104486275A CN 104486275 A CN104486275 A CN 104486275A CN 201410764632 A CN201410764632 A CN 201410764632A CN 104486275 A CN104486275 A CN 104486275A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
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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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Abstract
The invention provides a data chain intermediate-frequency signal processing method. Up-conversion processing on a data chain signal from a baseband signal to an intermediate-frequency signal is realized at a sending end by using digital orthogonal up-conversion; AD sampling is carried out on the intermediate-frequency signal in a data chain at a receiving end, and digital orthogonal down-conversion processing is carried out, so that down-conversion processing on the signal from the intermediate-frequency signal to the baseband signal is realized. According to the data chain intermediate-frequency signal processing method, a simulated frequency conversion process from the intermediate-frequency signal to the baseband signal is reduced, and modularized, minimized and comprehensive design development of data chain equipment is realized.
Description
Technical field
The present invention relates to the IF signal processing technology of Data-Link in engineering field, particularly relate to based on the Data-Link IF signal processing technology under the avionic device synthesization platform of software and radio technique.
Background technology
In data chain device group-net communication process, transmitting terminal carries out conversion process to the business datum sent and forms baseband signal, intermediate-freuqncy signal is upconverted to through single-conversion process by baseband signal, and then upconverted to the radiofrequency signal of system corresponding band again through single-conversion process by intermediate-freuqncy signal, then launched by radiofrequency signal multiplying arrangement.First the radiofrequency signal filtering received, amplification process and are down-converted to intermediate-freuqncy signal through mixing by receiving terminal, intermediate-freuqncy signal down-converts to baseband signal through mixing and filtering process again, corresponding conversion process is carried out to the baseband signal after conversion, demodulate the business datum entrained by signal, thus realize the information transmission between data chain device.
At present, following technology is usually adopted to process Data-Link signal.By radiofrequency signal to intermediate-freuqncy signal again in the whole conversion process of baseband signal, signal is always the frequency-conversion processing of analog signal.Only after becoming baseband signal, use AD sampling to become digital signal and carry out calculation process.
Above-mentioned normal signal treatment technology has himself pluses and minuses: advantage is that base band signal process is simple, and operand is little, low to CPU device performance requirements needed for computing, is convenient to realize.It is many that shortcoming is to use frequency-variable module, and equipment power dissipation is bulky, and be unfavorable for that data chain device is miniaturized, the synthesization particularly for avionic device cannot realize.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of method of carrying out digitized processing in intermediate-freuqncy signal, the method reduce the simulated frequency conversion link of intermediate-freuqncy signal to baseband signal, achieve data chain device modularization, miniaturization, the designing and developing of synthesization.
The technical solution adopted for the present invention to solve the technical problems comprises the following steps:
1) at transmitting terminal, data to be sent are carried out differential coding, serioparallel exchange is carried out to the data after differential coding, form IQ two-way base band data D
iand D
q.
2) to D
iand D
qtwo-way base band data, uses mutually orthogonal base band sine wave to carry out sine weighting computing respectively, forms orthogonal IQ two-way base band msk signal I
band Q
b.
3) to orthogonal IQ two-way base band msk signal I
band Q
b, use mutually orthogonal mid-frequency sinusoidal wavelength-division not carry out mixing operations, form orthogonal IQ two-way intermediate frequency msk signal I
iFand Q
iF.Orthogonal IQ two-way intermediate frequency msk signal I
iFand Q
iFintermediate frequency msk signal y is formed through sum operation
mSKexport radio frequency frequency mixing module to, settling signal is launched.
4) at receiving terminal, high-speed AD sampling is carried out to the analog if signal after mixing, IQ two-way is divided into the digitized intermediate frequency signal after high-speed AD sampling, by adopting digital quadrature down conversion signal processing algorithm to complete Data-Link signal by the frequency-conversion processing of intermediate frequency to baseband signal, the IQ two-way MSK baseband signal I of output orthogonal simultaneously
inand Q
in.
5) local reception pseudo-code forms IQ two-way base band data I_local and Q_local after serioparallel exchange, base band data I_local and Q_local respectively with orthogonal IQ two-way MSK baseband signal I
inand Q
incarry out related operation, the numerical result of IQ two-way related operation carries out square operation respectively again, and the results added of last IQ two-way square operation obtains the numerical value of relevant peaks, thus completes the digital multiple correlation algorithm of Received signal strength, and exports the numerical value of relevant peaks.
6) the relevant peaks information that exporting according to digital complex correlator of receiving terminal, complete Received signal strength synchronous after, carry out the demodulation process of signal, solve information entrained by Data-Link signal.
The invention has the beneficial effects as follows: realize Data-Link signal by the upconversion process of baseband signal to intermediate-freuqncy signal at transmitting terminal by using digital quadrature upconvert; At receiving terminal by sampling to Data-Link intermediate-freuqncy signal AD and carrying out digital quadrature down conversion process, achieve signal by the down-converted of intermediate frequency to baseband signal.Whole frequency-conversion processing process uses software algorithm to realize, and eliminates the simulated frequency conversion unit of intermediate frequency to baseband signal frequency-conversion processing, simplifies the design of system; Meanwhile, adopt this kind of signal transacting, utilize the hardware superiority that programmable device FPGA logical resource is abundant, past common signal processing function realized on several CPU is incorporated into a chip and realizes.Add the flexibility of system, reduce cost and the difficulty of test at development initial stage, be convenient to system and realize modularization, miniaturization and synthesization, add the reliability of system simultaneously.
During with conventional method deal with data chain signal, the special frequency-variable module of usage data chain by intermediate-freuqncy signal to the frequency-conversion processing of base band, change when system index or have new function to need often to need when adding and upgrade to redesign frequency-variable module, because frequency-variable module is that Data-Link is special, cannot be used by other function of system under avionic device synthesization platform, the requirement of avionics comprehensive cannot be met.
Present invention achieves the signal transacting of the Data-Link function under avionics comprehensive platform, software algorithm is adopted to achieve the frequency-conversion processing of Data-Link intermediate-freuqncy signal to baseband signal, adopt digital multiple correlation algorithm to carry out related operation process to the received signal simultaneously, once complete demodulation and expand process, simplify the flow process of signal transacting.The signal processing function simultaneously being needed several CPU arithmetic element jointly to complete in the past realizes with a programming device, and what enormously simplify system designs and develops cost.
Accompanying drawing explanation
Fig. 1 is of the present invention at Data-Link channel receiving terminal IF signal processing algorithm flow chart;
Fig. 2 is of the present invention at Data-Link channel transmitting terminal IF signal processing algorithm flow chart.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described, the present invention includes but be not limited only to following embodiment.
The designed upconvert baseband signals treatment technology realized of the present invention, IQ two paths of data is formed by carrying out differential coding to sent data and carrying out serioparallel exchange to the data after coding, adopt mutually orthogonal sine wave to carry out sine weighting computing respectively to IQ two paths of data simultaneously, the baseband signal after sine weighting is carried out with mutually orthogonal mid-frequency sinusoidal ripple the upconversion process that mixing operations completes baseband signal respectively.Method schematic diagram as shown in Figure 2.The invention provides a kind of upconversion process technology in Data-Link baseband signal, it is characterized in that comprising the following steps:
At the transmitting terminal of channel, first differential coding is carried out to the initial data sent, and serioparallel exchange is carried out to the data after differential coding.
Data after serioparallel exchange are divided into IQ two paths of data, compute weighted process with mutually orthogonal sinusoidal carrier respectively.
Baseband signal after sine weighting process is carried out mixing operations with mutually orthogonal mid-frequency sinusoidal ripple respectively, and the two-way IQ intermediate-freuqncy signal after mixing is added, complete the upconversion process of baseband signal to intermediate-freuqncy signal.
The designed intermediate-freuqncy signal down-converted technology realized of the present invention, by carrying out AD sampling at intermediate frequency to signal and using Digital Down Convert process to realize Data-Link intermediate-freuqncy signal by the frequency-conversion processing of intermediate frequency to baseband signal.Adopt digital multiple correlation algorithm to complete the demodulation process of Data-Link signal simultaneously.Method schematic diagram as shown in Figure 1.The invention provides a kind of down-converted technology in Data-Link intermediate-freuqncy signal, it is characterized in that comprising the following steps:
At the receiving terminal of channel, AD sampling is carried out to the Data-Link intermediate-freuqncy signal received, the speed of sampling will meet 2 times that are greater than signal bandwidth, IQ two paths of signals is divided into the signal after sampling, uses digital quadrature down conversion algorithm to complete Received signal strength by the down-converted of intermediate frequency to baseband signal.
To the IQ two paths of signals after down-conversion, respectively with local PN serioparallel exchange after IQ two paths of data carry out related calculation, the result of IQ two-way related operation carries out quadratic sum computing again, completes the multiple correlation process of down-conversion signal.IQ two-way quadratic sum operation result is reached subsequent module for processing as relevant peaks Information Number.
Complete local PN code synchronous after, according to the relevant peaks that complex correlator exports, adopt demodulation once-through operation to complete the demodulation process of Data-Link carry information.
Below in conjunction with drawings and Examples, the present invention is further described.
The processing method of data chain device transmitting terminal intermediate-freuqncy signal, will be described in detail to embodiments of the present invention below, and as shown in Figure 2, its step is as follows:
Step 1: transmitting terminal carries out differential coding to the business datum sent, and carrying out serioparallel exchange to the data after differential coding is IQ two-way base band data D
iand D
q.
Step 2: to the IQ two-way base band data D of step 1
iand D
q, use orthogonal base band sine wave to compute weighted, form orthogonal IQ two-way base band msk signal I
band Q
b.
Step 3: to the signal after process in step 2, use mutually orthogonal mid-frequency sinusoidal wavelength-division not carry out mixing operations, form orthogonal IQ two-way intermediate frequency msk signal I
iFand Q
iF, orthogonal IQ two-way intermediate frequency msk signal I
iFand Q
iFintermediate frequency msk signal y is formed through sum operation
mSKexport radio frequency frequency mixing module to, settling signal is launched.
Step 4: repeat step 1 to step 3, until be sent.
The processing method of data chain device receiving terminal intermediate-freuqncy signal, will be described in detail to embodiments of the present invention below, and as shown in Figure 1, its step is as follows:
Step 1: high-speed AD sampling is carried out to the analog if signal after mixing at receiving terminal, IQ two-way is divided into the digitized intermediate frequency signal after high-speed AD sampling, by adopting digital quadrature down conversion signal processing algorithm to complete Data-Link signal by the frequency-conversion processing of intermediate frequency to baseband signal, the IQ two-way MSK baseband signal I of output orthogonal simultaneously
inand Q
in.
Step 2: to the IQ two-way MSK baseband signal I of step 1 output orthogonal
inand Q
in, local reception pseudo-code forms IQ two-way base band data I_local and Q_local after serioparallel exchange, base band data I_local and Q_local respectively with orthogonal IQ two-way MSK baseband signal I
inand Q
incarry out related operation, the numerical result of IQ two-way related operation carries out square operation respectively again, and the results added of last IQ two-way square operation obtains the numerical value of relevant peaks, thus completes the digital multiple correlation algorithm of Received signal strength, and exports the numerical value of relevant peaks.
Step 3: to the signal after process in step 2, the relevant peaks information that receiving terminal is exporting according to digital complex correlator, complete Received signal strength synchronous after, carry out the demodulation process of signal, solve information entrained by Data-Link signal.
Step 4: repeat step 1 to step 3, until receive, exports the information entrained by Data-Link signal.
Claims (1)
1. a Data-Link IF signal processing method, is characterized in that comprising the steps:
1) at transmitting terminal, data to be sent are carried out differential coding, serioparallel exchange is carried out to the data after differential coding, form IQ two-way base band data D
iand D
q;
2) to two-way base band data D
iand D
quse mutually orthogonal base band sine wave to carry out sine weighting computing respectively, form orthogonal IQ two-way base band msk signal I
band Q
b;
3) to orthogonal IQ two-way base band msk signal I
band Q
buse mutually orthogonal mid-frequency sinusoidal wavelength-division not carry out mixing operations, form orthogonal IQ two-way intermediate frequency msk signal I
iFand Q
iF; Orthogonal IQ two-way intermediate frequency msk signal I
iFand Q
iFintermediate frequency msk signal y is formed through sum operation
mSKexport radio frequency frequency mixing module to, settling signal is launched;
4) at receiving terminal, AD sampling is carried out to the analog if signal after mixing, IQ two-way is divided into the digitized intermediate frequency signal after AD sampling, digital quadrature down conversion signal processing algorithm is adopted to complete by the frequency-conversion processing of intermediate frequency to baseband signal, simultaneously the IQ two-way MSK baseband signal I of output orthogonal
inand Q
in;
5) local reception pseudo-code forms IQ two-way base band data I_local and Q_local after serioparallel exchange, base band data I_local and Q_local respectively with orthogonal IQ two-way MSK baseband signal I
inand Q
incarry out related operation, the numerical result of IQ two-way related operation carries out square operation respectively again, and the results added of last IQ two-way square operation obtains the numerical value of relevant peaks, thus completes the digital multiple correlation algorithm of Received signal strength, and exports the numerical value of relevant peaks;
6) the relevant peaks information that exporting according to digital complex correlator of receiving terminal, complete Received signal strength synchronous after, carry out the demodulation process of signal, solve information entrained by Data-Link signal.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111064494A (en) * | 2019-12-11 | 2020-04-24 | 四川九洲电器集团有限责任公司 | Demodulation and de-spreading method, system, medium and equipment for MSK spread spectrum receiver |
| CN115766359A (en) * | 2022-08-15 | 2023-03-07 | 成都信息工程大学 | Ultra-wideband MSK modulation method and system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101534160A (en) * | 2009-04-16 | 2009-09-16 | 上海交通大学 | Wireless channel parameter measurement device and method thereof |
| CN103281275A (en) * | 2013-04-27 | 2013-09-04 | 中国科学院自动化研究所 | Minimum shift keying/Gaussian Filtered minimum shift keying (MSK/GMSK) direct sequence spread spectrum signal receiver |
| CN103580719A (en) * | 2012-08-06 | 2014-02-12 | 上海航天测控通信研究所 | Full-digital intermediate-frequency despreading demodulation receiver |
-
2014
- 2014-12-11 CN CN201410764632.5A patent/CN104486275A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101534160A (en) * | 2009-04-16 | 2009-09-16 | 上海交通大学 | Wireless channel parameter measurement device and method thereof |
| CN103580719A (en) * | 2012-08-06 | 2014-02-12 | 上海航天测控通信研究所 | Full-digital intermediate-frequency despreading demodulation receiver |
| CN103281275A (en) * | 2013-04-27 | 2013-09-04 | 中国科学院自动化研究所 | Minimum shift keying/Gaussian Filtered minimum shift keying (MSK/GMSK) direct sequence spread spectrum signal receiver |
Non-Patent Citations (1)
| Title |
|---|
| 刘飞: "数字中频调制解调系统的设计和实现", 《现代电子技术》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111064494A (en) * | 2019-12-11 | 2020-04-24 | 四川九洲电器集团有限责任公司 | Demodulation and de-spreading method, system, medium and equipment for MSK spread spectrum receiver |
| CN111064494B (en) * | 2019-12-11 | 2021-04-27 | 四川九洲电器集团有限责任公司 | Demodulation and de-spreading method, system, medium and equipment for MSK spread spectrum receiver |
| CN115766359A (en) * | 2022-08-15 | 2023-03-07 | 成都信息工程大学 | Ultra-wideband MSK modulation method and system |
| CN115766359B (en) * | 2022-08-15 | 2023-09-12 | 成都信息工程大学 | Ultra-wideband MSK modulation method and system |
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Application publication date: 20150401 |