CN109286585A - A kind of acquisition algorithm based on USB TT & C architecture - Google Patents
A kind of acquisition algorithm based on USB TT & C architecture Download PDFInfo
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- CN109286585A CN109286585A CN201810946886.7A CN201810946886A CN109286585A CN 109286585 A CN109286585 A CN 109286585A CN 201810946886 A CN201810946886 A CN 201810946886A CN 109286585 A CN109286585 A CN 109286585A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/165—Spectrum analysis; Fourier analysis using filters
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mathematical Physics (AREA)
- General Physics & Mathematics (AREA)
- Complex Calculations (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
A kind of acquisition algorithm based on USB TT & C architecture, it is characterized in that, the following steps are included: step 1) captures initial phase: filtered signal is sent into FFT spectrum analysis module, FFT operation is carried out to input signal, it is compared after FFT determines window processing with decision threshold, selects the Frequency point higher than thresholding；Step 2) determines signal whether effective stage: when Frequency point is symmetrical in amplitude and frequency distribution, then the frequency identified being sent into frequency mixing module compensation, while starting frequency locking ring；If the distribution of Frequency point does not show symmetry, determine that input signal has interference or other abnormal conditions, signal capture not passes through；Step 3) is in tracking phase: FFT spectrum analysis module keeps work, monitors the symmetry of frequency spectrum, if it find that frequency spectrum is abnormal, then provides error signal and resetted to frequency locking ring.
Description
Technical field
The present invention relates to a kind of acquisition algorithms based on USB TT & C architecture, lead applied to including satellite TT&C, satellite
The fields such as boat, mobile communication.
Background technique
With the deep development of the space technologies such as deep space exploration, manned space flight, business space flight, Satellite TT function is increasingly
Complexity forms the spaceflight TT&C system of a variety of different systems and function, but unified S frequency range (USB) TT&C system is still
Wherein critically important one of observing and controlling means.With the rapid development of Digital Signal Processing, USB TT&C Transponder is gradually used
If digitization processing mode realizes, with meet spaceflight TT&C system versatility, inheritance, flexibility requirement.
In USB TT&C system digitized processing, the capture of residual error carrier wave facilitates subcarrier signal and sidetone signal
Synchronous and tracking.When double stages of catching contain subcarrier signal or tracking phase input signal is faint so that the of short duration losing lock weight of loop
When new capture, due to the presence of the big spectral line in residual error carrier wave two sides, it is possible to the risk being locked into there are loop mistake on incorrect frequency.
Summary of the invention
It is locked into the risk on incorrect frequency for loop mistake, a kind of acquisition algorithm based on USB TT & C architecture is proposed, adopts
The method for capturing and tracing combined with FFT with frequency and phase lock loop, the characteristics of using PM signal spectrum symmetry, fast Acquisition residual error
Frequency, and differentiate that interference signal effectively prevent receiving loop vacation lock according to this, and then adapt to USB TT&C Transponder Larger Dynamic Doppler
Variation and the requirement of muting sensitivity.
A kind of acquisition algorithm based on USB TT & C architecture of the invention, comprising the following steps:
Step 1): capture initial phase
Filtered signal is sent into FFT spectrum analysis module, FFT operation is carried out to input signal, is determined at window by FFT
It is compared after reason with decision threshold, selects the Frequency point higher than thresholding；
Step 2): determine signal whether effective stage
When Frequency point is symmetrical in amplitude and frequency distribution, then the frequency identified is sent into frequency mixing module compensation, together
Shi Qidong frequency locking ring；
If the distribution of Frequency point does not show symmetry, determine that input signal has interference or other abnormal conditions, letter
Number capture not pass through；
Step 3): in tracking phase
FFT spectrum analysis module keeps work, monitors the symmetry of frequency spectrum, if it find that frequency spectrum is abnormal, then to the letter that makes mistake
It number is resetted to frequency locking ring.
Further, for the acquisition algorithm based on USB TT & C architecture, it is characterised in that the following:
1, initial phase is captured, FFT spectrum analysis module carries out FFT to input signal in the Doppler spread of entire signal
Operation is compared with decision threshold after FFT determines window processing, selects the Frequency point higher than thresholding；
2, when Frequency point is symmetrical in amplitude and frequency distribution, determine that input signal is effective, the sequence of Frequency point is arranged
Central value after sequence is as residual carrier frequency value, and frequency mixing module is arrived in compensation, while generating an enabling signal, for starting
The work of FLL ring, FLL ring accurately track residual carrier frequency；If the distribution of Frequency point does not show symmetry, sentence
Determine input signal and there are interference or other abnormal conditions, signal capture not passes through；
3, in tracking phase, FFT spectrum analysis module keeps work, monitors the symmetry of frequency spectrum, if discovery signal spectrum is not
It is symmetrical centered on residual carrier, then it is determined as false lock status, signal capture tracking is abnormal, and FFT spectrum analysis module generates at this time
Error indication signal resets FLL ring, and the local carrier frequency of frequency mixing module is set to the center signal that FFT is detected
Frequency.
The advantages of the present invention over the prior art are that: a kind of acquisition algorithm based on USB TT & C architecture of the invention,
Applied to including the fields such as satellite TT&C, satellite navigation, mobile communication, versatility is high, and adaptation input range range is wide, special
The TT&C Transponder not being suitably applied under the conditions of Larger Dynamic Doppler variation and high sensitivity.Using FFT fast Acquisition algorithm
The USB TT&C Transponder intermediate-freuqncy signal acquisition and tracking algorithm combined with frequency and phase lock loop, make full use of PM signal spectrum it is symmetrical,
The visual wide frequency range of FFT spectrum analysis and the fast feature of arithmetic speed meet Larger Dynamic Doppler variation and high sensitivity
It is required that effectivelying prevent loop mistake lock on incorrect frequency, enhance the robustness and reliability of system.
Detailed description of the invention
Fig. 1 is the realization block diagram of the acquisition algorithm of the invention based on USB TT & C architecture.
Specific embodiment
Invention is further described in conjunction with attached drawing and example.
Fig. 1 be the present invention is based on a realizations block diagram of the acquisition algorithm of USB TT & C architecture, including: be mixed 0, low
Pass filter 1, FFT spectrum analysis 2, frequency locking ring 3.
As shown in Figure 1, the digital medium-frequency signal of input is mixed respectively with the SIN/COS signal that NCO is generated, formed just
The road the I signal and the road Q signal of friendship carry out low-pass filtering to filter out high fdrequency component.
Filtered signal is sent into FFT spectrum analysis module, to input signal in the Doppler spread of entire signal
FFT operation is carried out, therefore, it is determined that whether signal is effective, if it is valid, the frequency identified is sent into frequency mixing module compensation, together
Shi Qidong frequency locking ring.FFT spectrum analysis module mainly considers several aspects: (1) since signal frequency search range is inputted
Signal Doppler and local clock frequency drift are kept within bounds, and FFT observation signal frequency range needs covering frequence search range.(2)
It needs to set suitable thresholding when spectral line determines, and windowing process is carried out to frequency domain spectral line, to identify that useful signal carries
The center frequency value of wave.(3) in order to improve the precision of frequency discrimination, the frequency resolution of FFT needs certain requirement.(4) FFT
Implementation complexity is directly related with FFT operation points, and for the programmable integrated circuits such as FPGA, DSP, computational complexity is straight
Connecing influences data storage depth and processing time, and FFT points are selected as at 512 points here.
In tracking phase, FFT spectrum analysis module keeps work, the symmetry of frequency spectrum is monitored, if it find that frequency spectrum is abnormal, then
Error signal is provided to be resetted to frequency locking ring.
The content that description in the present invention is not described in detail belongs to the well-known technique of professional and technical personnel in the field.
Claims (5)
1. a kind of acquisition algorithm based on USB TT & C architecture, which comprises the following steps:
Step 1): capture initial phase
Filtered signal is sent into FFT spectrum analysis module, FFT operation is carried out to input signal, after FFT determines window processing
It is compared with decision threshold, selects the Frequency point higher than thresholding；
Step 2): determine signal whether effective stage
When Frequency point is symmetrical in amplitude and frequency distribution, then the frequency identified is sent into frequency mixing module compensation, opened simultaneously
Dynamic frequency locking ring；
If the distribution of Frequency point does not show symmetry, determine that input signal has interference or other abnormal conditions, signal are caught
It obtains and not passes through；
Step 3): in tracking phase
FFT spectrum analysis module keeps work, monitors the symmetry of frequency spectrum, if it find that frequency spectrum is abnormal, then provide error signal to
Frequency locking ring is resetted.
2. a kind of acquisition algorithm based on USB TT & C architecture as described in claim 1, which is characterized in that described filtered
Signal forming process are as follows: the digital medium-frequency signal of input is mixed respectively with the SIN/COS signal that NCO is generated, and is formed orthogonal
The road I signal and the road Q signal carry out low-pass filtering to filter out high fdrequency component.
3. a kind of acquisition algorithm based on USB TT & C architecture as described in claim 1, which is characterized in that in the step 1)
FFT operation points are selected as at 512 points.
4. a kind of acquisition algorithm based on USB TT & C architecture as described in claim 1, which is characterized in that in the step 2)
Determine that input signal is effective, the central value after the sequence of Frequency point is sorted is as residual carrier frequency value, compensation to mixing mould
Block, while an enabling signal is generated, for starting the work of FLL ring, FLL ring accurately tracks residual carrier frequency.
5. a kind of acquisition algorithm based on USB TT & C architecture as described in claim 1, which is characterized in that in the step 3)
If being determined as false lock status, signal capture tracking is abnormal, at this time it was found that signal spectrum is symmetrical not centered on residual carrier
FFT spectrum analysis module generates error indication signal and resets to FLL ring, and the local carrier frequency of frequency mixing module is set to
The center signal frequency that FFT is detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810946886.7A CN109286585B (en) | 2018-08-20 | 2018-08-20 | Capture algorithm based on USB measurement and control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810946886.7A CN109286585B (en) | 2018-08-20 | 2018-08-20 | Capture algorithm based on USB measurement and control system |
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| Publication Number | Publication Date |
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| CN109286585A true CN109286585A (en) | 2019-01-29 |
| CN109286585B CN109286585B (en) | 2021-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810946886.7A Active CN109286585B (en) | 2018-08-20 | 2018-08-20 | Capture algorithm based on USB measurement and control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113364509A (en) * | 2021-05-10 | 2021-09-07 | 上海航天电子有限公司 | PM measurement and control system error-proof locking method and realization circuit thereof |
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| WO2008121524A1 (en) * | 2007-03-30 | 2008-10-09 | Olympus Communication Technology Of America, Inc. | Methods and systems for transmitting and processing pilot signals |
| CN104184471A (en) * | 2014-08-18 | 2014-12-03 | 中国航空无线电电子研究所 | Aviation wireless communication frequency detector and frequency detection method thereof |
| CN105607076A (en) * | 2015-12-23 | 2016-05-25 | 北京时代民芯科技有限公司 | Beidou 2nd generation B1 and B3 double-frequency receiver |
| CN105680905A (en) * | 2016-01-15 | 2016-06-15 | 中国空间技术研究院 | FM and PM signal carrier capturing method applicable to random modulation degree |
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2018
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Patent Citations (4)
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| WO2008121524A1 (en) * | 2007-03-30 | 2008-10-09 | Olympus Communication Technology Of America, Inc. | Methods and systems for transmitting and processing pilot signals |
| CN104184471A (en) * | 2014-08-18 | 2014-12-03 | 中国航空无线电电子研究所 | Aviation wireless communication frequency detector and frequency detection method thereof |
| CN105607076A (en) * | 2015-12-23 | 2016-05-25 | 北京时代民芯科技有限公司 | Beidou 2nd generation B1 and B3 double-frequency receiver |
| CN105680905A (en) * | 2016-01-15 | 2016-06-15 | 中国空间技术研究院 | FM and PM signal carrier capturing method applicable to random modulation degree |
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| CN113364509A (en) * | 2021-05-10 | 2021-09-07 | 上海航天电子有限公司 | PM measurement and control system error-proof locking method and realization circuit thereof |
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