CN106357323A - Satellite channel group delay compensation method and device - Google Patents
Satellite channel group delay compensation method and device Download PDFInfo
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- CN106357323A CN106357323A CN201610877945.0A CN201610877945A CN106357323A CN 106357323 A CN106357323 A CN 106357323A CN 201610877945 A CN201610877945 A CN 201610877945A CN 106357323 A CN106357323 A CN 106357323A
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- group delay
- satellite
- satellite repeater
- mathematical model
- repeater
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/364—Delay profiles
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Electromagnetism (AREA)
- Astronomy & Astrophysics (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
- Quality & Reliability (AREA)
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Abstract
The invention provides a satellite channel group delay compensation method which comprises the following steps of testing the group delay characteristic of a satellite transponder, and carrying out calculation according to a test result to obtain a group delay mathematical model of the satellite transponder; carrying out Hilbert transform on the group delay mathematical model of the satellite transponder to obtain a group delay mathematical model of a satellite equalizer, wherein group delay of the satellite equalizer is the reverse of that of the satellite transponder; and carrying out group delay compensation on a satellite signal which passes through the satellite transponder through the satellite equalizer. In addition, the invention also provides a satellite channel group delay compensation device. With adoption of the satellite channel group delay compensation method and device, through filtering action on group delay generated on the satellite signal which passes through the satellite transponder, group delay of a satellite channel is effectively compensated, and the error bit ability of the satellite signal and the performance of a satellite system are improved.
Description
Technical field
Wideband satellite communication field of the present invention is and in particular to a kind of satellite channel group delay compensation method and device.
Background technology
In satellite communication system, comprise imux due in satellite repeater passage, the nonlinear device such as omux, lead to letter
Produce group delay distortion number after transponder；And, in telecommunication transmission system, except Gaussian noise, co-channel interference are to biography
Defeated error code has an impact, and the group delay property of satellite channel can make error bit ability deteriorate further, has influence on the logical of satellite system
Letter performance.
Content of the invention
Technical problem
In view of this, the embodiment of the present invention provides satellite channel group delay compensation method or apparatus, the technical problem of solution
Group delay property for satellite channel can make error bit ability deteriorate further, has influence on the communication performance of satellite system.
The solution of problem
The present invention provides a kind of satellite channel group delay compensation method, comprises the following steps:
Satellite repeater is carried out with the test of group delay property, obtains described satellite repeater according to test result calculations
Group delay mathematical model；
When the group that Hilbert transform obtains satellite equalizer is carried out to the group delay mathematical model of described satellite repeater
Prolong mathematical model, wherein, the group delay of described satellite equalizer is contrary with the group delay of satellite repeater；
Satellite-signal through satellite repeater is carried out group delay compensation by described satellite equalizer.
Wherein, the described test that satellite repeater is carried out with group delay property, defends according to test result calculations obtain
The group delay mathematical model of star transponder specifically includes:
Bandwidth according to satellite repeater carries out the test of group delay property to each frequency in satellite repeater；
Generate the group delay figure of satellite repeater according to test result；
Numerical curve is fitted according to described group delay figure, obtains the group delay mathematical model of satellite repeater.
Wherein, described satellite equalizer is all-pass filter.
Wherein, the group delay mathematical model of described satellite repeater is parabola type.
Wherein, the group delay mathematical model of described satellite repeater is twtagd=w2/ 2, described all-pass filter model is
Separately, the present invention also provides a kind of satellite channel group delay balancer, comprising:
Group delay modeling unit, for carrying out the test of group delay property and according to test result calculations to satellite repeater
Obtain the group delay mathematical model of described satellite repeater；
Group delay converter unit, obtains for carrying out Hilbert transform to the group delay mathematical model of described satellite repeater
To the group delay mathematical model of satellite equalizer, wherein, the group delay of described satellite equalizer and the group delay of satellite repeater
On the contrary；And
Group delay compensation unit, for carrying out group by the satellite-signal through satellite repeater by described satellite equalizer
Compensation of delay.
Wherein, described group delay modeling unit includes:
Group delay tests subelement, carries out group for the bandwidth according to satellite repeater to each frequency in satellite repeater
The test of time-delay characteristics；
Group delay graphic hotsopt subelement, for generating the group delay figure of satellite repeater according to test result；
Curve matching subelement, for being fitted numerical curve according to described group delay figure, obtains satellite repeater
Group delay mathematical model.
Wherein, described satellite equalizer is all-pass filter.
Wherein, the group delay mathematical model of described satellite repeater is parabola type.
Wherein, the group delay mathematical model of described satellite repeater is twtagd=w2/ 2, described all-pass filter model is
Beneficial effects of the present invention
Using technique scheme, the present invention at least can obtain following technique effects:
By being filtered to the group delay producing through satellite repeater acting on, the effective compensation group delay of satellite channel
When, improve satellite-signal error bit ability, improve satellite system performance.
Brief description
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, below will be to institute in embodiment of the present invention description
Need use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only the present invention some enforcement
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also be implemented according to the present invention
The content of example and these accompanying drawings obtain other accompanying drawings.
Fig. 1 is the flow chart of the satellite channel group delay compensation method described in the present embodiment；
Fig. 2 is the test chart of the satellite channel group delay property described in the present embodiment；
Fig. 3 is the signal constellation (in digital modulation) figure that satellite channel described in the present embodiment does not carry out group delay compensation when qpsk modulates；
Fig. 4 is that the satellite channel described in the present embodiment carries out the signal constellation (in digital modulation) after group delay compensation when qpsk modulates
Figure；
Fig. 5 is the structure chart of the satellite channel group delay compensation device described in the present embodiment.
Run through accompanying drawing it should be noted that similar label is used for describing same or analogous element, feature and structure.
Specific embodiment
Description referring to the drawings is provided to help the disclosure that comprehensive understanding is limited by claim and its equivalent
Various embodiments.Hereinafter description includes the various details helping understand, but these details will be considered to be only example
Property.Therefore, it will be appreciated by those of ordinary skill in the art that without departing from the scope of the present disclosure and spirit in the case of, can be right
Various embodiments described herein makes various changes and modifications.In addition, in order to clear and succinct, the retouching of known function and construction
State and can be omitted.
Term used in following description and claims and vocabulary are not limited to document implication, but only by inventor
It is used for so that the disclosure clearly and is as one man understood.Therefore, to those skilled in the art it should be apparent that carrying
Description for following various embodiments of this disclosure merely to exemplary purpose, and unrestricted by claims and its
The purpose of the disclosure that equivalent limits.
It should be understood that unless in addition context clearly indicates, otherwise singulative also includes plural.Thus, for example,
Quoting of " assembly surface " is quoted including to one or more such surfaces.
Fig. 1 is the flow chart of the satellite channel group delay compensation method described in the present embodiment.
With reference to Fig. 1, the satellite channel group delay compensation method described in the present embodiment comprises the steps:
Step 1: satellite repeater is carried out with the test of group delay property, obtains described satellite according to test result calculations and turn
Send out the group delay mathematical model of device；
Step 2: Hilbert transform is carried out to the group delay mathematical model of described satellite repeater and obtains satellite equalizer
Group delay mathematical model, wherein, the group delay of described satellite equalizer is contrary with the group delay of satellite repeater；
Step 3: the satellite-signal through satellite repeater is carried out group delay compensation by described satellite equalizer.
Wherein, satellite channel group delay compensation method of the present invention is applied to wideband satellite communication transponder, by satellite
Transponder carries out the test of group delay property, and the satellite repeater group delay property that test is obtained is modeled, i.e. satellite
The group delay property of transponder can be emulated according to actual test result, and is calculated the group delay number of satellite repeater
Learn model.
Refer to Fig. 2, Fig. 2 is the test chart of the satellite channel group delay property described in the present embodiment.Described step 1 has
Body includes:
Bandwidth according to satellite repeater carries out the test of group delay property to each frequency in satellite repeater；
Generate the group delay figure of satellite repeater according to test result；
Numerical curve is fitted according to described group delay figure, obtains the group delay mathematical model of satellite repeater.
When implementing, it is first determined the bandwidth of satellite repeater, then frequency is passed through to each frequency in satellite repeater
Spectrometer carries out the test of group delay property, selects a series of Frequency point to be tested in the bandwidth of satellite repeater
The group delay of signal, obtains the group delay that signal produces in the plurality of Frequency point through satellite repeater, and wherein, frequency is permissible
Select at equal intervals to be tested.
Carry out corresponding drafting according to the group delay that above-mentioned signal produces through satellite repeater with the plurality of Frequency point to defend
The group delay figure of star transponder, as shown in Fig. 2 with the frequency values of Frequency point as transverse axis, with signal through satellite repeater
The group delay numerical value producing is the longitudinal axis, obtains satellite repeater corresponding group delay figure, that is, in the group of described satellite repeater
In time delay figure, the abscissa of each frequency is the frequency values of this frequency, and the vertical coordinate of each frequency is signal through satellite
Transponder is in the corresponding group delay numerical value producing of this frequency.
In the group delay figure of above-mentioned satellite repeater, each frequency is the point of Discrete Distribution, in order to turn to this satellite
The group delay sending out device carries out simulation modeling, is fitted corresponding numerical curve according to described group delay figure further, with
To enough frequencies and its corresponding group delay time point, thus calculating the group delay mathematical model determining satellite repeater.
In the present embodiment, when the group delay mathematical model of described satellite repeater is parabola type, such as twtagd=w2/
2 it will be understood that the group delay mathematical model of described satellite repeater can also be the other types such as hyperbola.
All-pass filter (iir wave filter) is adopted to design satellite equalizer in the present invention, all-pass filter refers to filter
The amplitude of device transmission function is unrelated with frequency, and system is the 1 whole frequency components passing through in input with amplitude gain；Described all-pass
The sign of filter characteristic includes amplitude, phase place and group delay, can be played by designing the group delay property of all-pass filter
Compensation filter acts on, thus becoming the phase equalizer of satellite.
Specifically, in the present embodiment, when the group delay mathematical model of described satellite repeater is parabola type, such as
twtagd=w2/ 2, described all-pass filter model isAmplitude-frequency be may insure by this model
Characteristic is 1.
Due to the characteristic of Hilbert transform, by the group delay mathematical model twta of described satellite repeatergd=w2/ 2 enter
The group delay mathematical model obtaining satellite equalizer after row Hilbert transform is eqgd=-w2/ 2, i.e. described satellite equalizer
Group delay contrary with the group delay of satellite repeater, and signal keeps not through described satellite equalizer amplitude-frequency characteristic is same
Become, be so achieved that the group delay that signal is produced through satellite repeater is filtered acting on, and effective compensation group delay,
Improve systematic function.
Refer to 3 and Fig. 4, Fig. 3 and Fig. 4 is that the satellite channel described in the present embodiment carries out group delay when qpsk modulates respectively
When compensate before and compensate after signal constellation (in digital modulation) figure.It is apparent that in Fig. 3, when not carrying out group delay compensation, signal is through turning
Group delay distortion is produced seriously, signal error bit ability is poor, and the communication quality of satellite system is not good after sending out device；And in Fig. 4, letter
Number compensate after group delay through satellite equalizer, distorted signals are effectively improved, and improve signal error bit ability
And signal interpretation performance, the communication performance of satellite system significantly improved.
Using technique scheme, this embodiment can use to obtain following technique effect:
By being filtered to the group delay producing through satellite repeater acting on, the effective compensation group delay of satellite channel
When, improve satellite-signal error bit ability, improve satellite system performance.
Refer to Fig. 5, Fig. 5 is the structure chart of the satellite channel group delay compensation device described in the present embodiment.Described device
Including: group delay modeling unit 10, group delay converter unit 20 and group delay compensation unit 30, described group delay modeling unit 10
For satellite repeater being carried out with the test of group delay property and obtaining the group of described satellite repeater according to test result calculations
Time delay mathematical model；Described group delay converter unit 20 is used for carrying out Xi Er to the group delay mathematical model of described satellite repeater
Bert conversion obtains the group delay mathematical model of satellite equalizer, and wherein, the group delay of described satellite equalizer is forwarded with satellite
The group delay of device is contrary；Described group delay compensation unit 30 is used for for the satellite-signal through satellite repeater passing through described defending
Star equalizer carries out group delay compensation.
Wherein, described group delay modeling unit 10 further includes:
Group delay tests subelement 101, for the bandwidth according to satellite repeater, each frequency in satellite repeater is entered
The test of row group delay property；
Group delay graphic hotsopt subelement 102, for generating the group delay figure of satellite repeater according to test result；
Curve matching subelement 103, for being fitted numerical curve according to described group delay figure, obtains satellite and forwards
The group delay mathematical model of device.
Separately, described satellite equalizer is all-pass filter, in the present embodiment, the group delay mathematical modulo of described satellite repeater
Type is parabola type, and the group delay mathematical model of described satellite repeater is twtagd=w2/ 2, described all-pass filter model
For
It should be noted that the various embodiments of the disclosure as above are generally related to input data to a certain extent
Process and output data generation.This input data is processed and output data generate can be in hardware or soft with combination of hardware
Realize in part.For example, can in mobile device or similar or related circuit adopt specific electronic components for realize with
The function of the various embodiment associations of the disclosure as mentioned above.Alternatively, to operate according to the instruction that stored one or more
Multiple processors can achieve the function of associating with the various embodiments of the disclosure as described above.If it is, then these instructions
Can be stored on one or more non-transitory processor readable mediums, this is in the scope of the present disclosure.Processor can
The example reading medium includes read only memory (rom), random access memory (ram), cd-rom, tape, floppy disk and optics number
According to storage device.In addition, can be by disclosure art for realizing functional computer program, instruction and the instruction segment of the disclosure
Programmer easily explain.
Although the various embodiments with reference to the disclosure illustrate and describe the disclosure, those skilled in the art will manage
Solution, in the case of without departing from the spirit and scope of the present disclosure being defined by the appended claims and the equivalents thereof, can enter to it
Various changes in row form and details.
Claims (10)
1. a kind of satellite channel group delay compensation method is it is characterised in that the method comprising the steps of:
Satellite repeater is carried out with the test of group delay property, obtained according to test result calculations described satellite repeater group when
Prolong mathematical model；
The group delay number that Hilbert transform obtains satellite equalizer is carried out to the group delay mathematical model of described satellite repeater
Learn model, wherein, the group delay of described satellite equalizer is contrary with the group delay of satellite repeater；
Satellite-signal through satellite repeater is carried out group delay compensation by described satellite equalizer.
2. method as claimed in claim 1 is it is characterised in that the described test that satellite repeater is carried out with group delay property, root
Specifically include according to the group delay mathematical model that test result calculations obtain described satellite repeater:
Bandwidth according to satellite repeater carries out the test of group delay property to each frequency in satellite repeater；
Generate the group delay figure of satellite repeater according to test result；
Numerical curve is fitted according to described group delay figure, obtains the group delay mathematical model of satellite repeater.
3. method as claimed in claim 1 is it is characterised in that described satellite equalizer is all-pass filter.
4. method as claimed in claim 3 is it is characterised in that the group delay mathematical model of described satellite repeater is parabola class
Type.
5. method as claimed in claim 4 is it is characterised in that the group delay mathematical model of described satellite repeater is twtagd=
w2/ 2, described all-pass filter model is
6. a kind of satellite channel group delay balancer is it is characterised in that include:
Group delay modeling unit, for carrying out the test of group delay property and being obtained according to test result calculations to satellite repeater
Group delay mathematical model to described satellite repeater；
Group delay converter unit, is defended for carrying out Hilbert transform to the group delay mathematical model of described satellite repeater
The group delay mathematical model of star equalizer, wherein, the group delay of described satellite equalizer is contrary with the group delay of satellite repeater；
And
Group delay compensation unit, for carrying out group delay by the satellite-signal through satellite repeater by described satellite equalizer
Compensate.
7. device as claimed in claim 6 is it is characterised in that described group delay modeling unit includes:
Group delay tests subelement, carries out group delay for the bandwidth according to satellite repeater to each frequency in satellite repeater
The test of characteristic；
Group delay graphic hotsopt subelement, for generating the group delay figure of satellite repeater according to test result；
Curve matching subelement, for being fitted numerical curve according to described group delay figure, obtains the group of satellite repeater
Time delay mathematical model.
8. device as claimed in claim 6 is it is characterised in that described satellite equalizer is all-pass filter.
9. device as claimed in claim 8 is it is characterised in that the group delay mathematical model of described satellite repeater is parabola class
Type.
10. device as claimed in claim 9 is it is characterised in that the group delay mathematical model of described satellite repeater is twtagd=
w2/ 2, described all-pass filter model is
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| CN201610877945.0A CN106357323A (en) | 2016-10-08 | 2016-10-08 | Satellite channel group delay compensation method and device |
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| CN201610877945.0A CN106357323A (en) | 2016-10-08 | 2016-10-08 | Satellite channel group delay compensation method and device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106850103A (en) * | 2017-02-28 | 2017-06-13 | 北京睿信丰科技有限公司 | The modification method and its device of group delay distortion |
| CN111817992A (en) * | 2020-07-09 | 2020-10-23 | 成都傅立叶电子科技有限公司 | Digital channel group delay equalizer and implementation method and device thereof |
| CN113253310A (en) * | 2021-06-28 | 2021-08-13 | 中国人民解放军国防科技大学 | Method and system for measuring group delay of high-precision GNSS receiver of carrier phase |
| CN113691297A (en) * | 2020-05-18 | 2021-11-23 | 中国电信股份有限公司 | Signal receiving method and device and signal transmission system |
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| US20090052507A1 (en) * | 2007-09-05 | 2009-02-26 | Steven Eymann | System and Method for Closed-loop Signal Distortion |
| CN103201952A (en) * | 2010-07-26 | 2013-07-10 | 麦里普大学 | Ota-based current-mode filter and oscillator |
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| CN101136679A (en) * | 2006-09-01 | 2008-03-05 | 普天信息技术研究院 | Time delay compensation process in mobile communication system |
| US20090052507A1 (en) * | 2007-09-05 | 2009-02-26 | Steven Eymann | System and Method for Closed-loop Signal Distortion |
| CN103201952A (en) * | 2010-07-26 | 2013-07-10 | 麦里普大学 | Ota-based current-mode filter and oscillator |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106850103A (en) * | 2017-02-28 | 2017-06-13 | 北京睿信丰科技有限公司 | The modification method and its device of group delay distortion |
| CN113691297A (en) * | 2020-05-18 | 2021-11-23 | 中国电信股份有限公司 | Signal receiving method and device and signal transmission system |
| CN113691297B (en) * | 2020-05-18 | 2022-08-02 | 中国电信股份有限公司 | Signal receiving method and device and signal transmission system |
| CN111817992A (en) * | 2020-07-09 | 2020-10-23 | 成都傅立叶电子科技有限公司 | Digital channel group delay equalizer and implementation method and device thereof |
| CN113253310A (en) * | 2021-06-28 | 2021-08-13 | 中国人民解放军国防科技大学 | Method and system for measuring group delay of high-precision GNSS receiver of carrier phase |
| CN113253310B (en) * | 2021-06-28 | 2021-10-08 | 中国人民解放军国防科技大学 | Method and system for measuring group delay of high-precision GNSS receiver of carrier phase |
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