CN105698821B - A kind of antenna and poor channel error in pointing scaling method - Google Patents
A kind of antenna and poor channel error in pointing scaling method Download PDFInfo
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- CN105698821B CN105698821B CN201610064103.3A CN201610064103A CN105698821B CN 105698821 B CN105698821 B CN 105698821B CN 201610064103 A CN201610064103 A CN 201610064103A CN 105698821 B CN105698821 B CN 105698821B
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Abstract
The invention discloses a kind of antenna and poor channel error in pointing without tower scaling method, first, utilize raster scan art, certain scanning range and sweep speed are set according to antenna parameter, antenna is controlled to carry out raster scanning, the real-time angular and power data of antenna and poor channel are obtained respectively, form antenna three-dimensional figure；Secondly, in certain power bracket and poor channel angle data generation azimuth pitch two-dimensional elliptic curve is intercepted respectively using dual threshold；Finally, acquisition and poor elliptic curve is fitted using the methods of the principle of least square and unruly-value rejecting, its center is positioned, obtained and poor channel miss distance, so as to calculate corresponding and poor channel error in pointing.This method not only adapts to astronomical observation field, is also applied for Aerospace Tracking ＆ Control.The present invention reduces antenna tracking errors, improve equipment tracking accuracy.
Description
Technical field
The present invention relates to a kind of antennas and poor channel error in pointing scaling method, more particularly to Aerospace Tracking ＆ Control pulse
Antenna is carried out using sources such as geosynchronous satellite or the sun and poor channel error in pointing is determined without tower beacon.
Background technology
Antenna orientation-correcting is widely used observes field in radio astronomy, by orientation-correcting, can accurately guide astronomy
Telescope main beam alignment observation celestial body, it is ensured that antenna can receive most strong observation signal.
Radiometric field, monopulse antenna are commonly designed artificial for receiving with poor two channels and channel
Satellite or cooperative target downlink signal are into row information demodulation process, and tracking channel is then used to implement and artificial object is carried out certainly
Motion tracking.
For Radiometric field, antenna is directed toward according to the antenna orientation-correcting method based on radio star
When error is corrected, inconsistency is directed toward with poor interchannel due to existing, it, will only by carrying out Pointing Calibration with channel
Cause antenna tracking accuracy overproof, this requires find solution in engineering.
Invention content
The present invention is missed to solve the prior art using the antenna orientation-correcting method based on radio star to be directed toward to antenna
When difference is corrected, inconsistency is directed toward with poor interchannel due to existing, only by carrying out Pointing Calibration with channel, will be led
The problem of causing antenna tracking accuracy overproof proposes a kind of antenna and poor channel error in pointing scaling method.
The technical scheme is that：A kind of antenna and poor channel error in pointing are without tower scaling method, which is characterized in that packet
Include following steps：
(1) using raster scan art, scanning range and sweep speed are set according to antenna parameter, control antenna carries out light
Grid scan, and obtain the real-time angular and power data of antenna and poor channel respectively, form antenna three-dimensional figure；
(2) in threshold range and poor channel angle data generation orientation, pitching two are intercepted respectively using dual threshold method
Tie up elliptic curve；
(3) acquisition and poor elliptic curve is fitted using the principle of least square and method of abnormal value removing and correction, to it
Center is positioned, and is obtained and poor channel miss distance, so as to calculate corresponding and poor channel error in pointing.
The step (1) acquires antenna bearingt, pitch angle and the antenna spoke received using power probe in real time
Radio is put down, and forms three-dimensional data, and each group of one, data corresponding three-dimensional space point generates width dimensional antenna radiation by numerous points
Directional diagram.
The specific implementation step of the step (1) is as follows：
(1) antenna scanning range and scanning speed are set according to antenna performance index and antenna system angular samples rate respectively
Degree；
(2) calculate orientation stepping-in amount, constant bearing angle, pitching on from it is lower or by lower from being above scanned stepping meter
It calculates；
(3) when pitching scan from it is most lower or most upper when, orientation by calculating orientation stepping-in amount stepping, pitching by it is lower from upper or
By the upper amount of the being scanned calculating again under；So repeatedly, until complete setting scanning area scanning amount calculate, and by these
Antenna scanning trajectory when scanning amount generation is opposite；
(4) it calculates choosing and measures purpose target absolute time theoretical trajectory during target calculating scanning；The measurement target includes mark
The strong radio source of school tower, synchronous satellite or the sun；
(5) antenna scanning trajectory when being superimposed opposite on the basis of the target absolute time theoretical trajectory calculated guides day
Line carries out track following.
The acquisition of the elliptic curve and the specific algorithm of least square centralized positioning are as follows：
(1) initial data using dual threshold is split, two segmentation planes is determined by threshold value, choose this two segmentations
Data of the sampled data as fitting between face；
To N number of sampled pointManually choose two threshold value BcLowAnd BcUpSo that
BcLowAnd BcUpMeet：
Remove section [BcLow,BcUp] other than numerical value, the sampled point retained forms new intensity data
I.e.：
So Subpoint is concentrated in an annulus in plane；
(2) oval least square fitting is carried out to one group of sampled point of target, can determine the center of target, grow,
The parameters such as semi-minor axis and major axes orientation；
If the general equation of conic section is：
If：
So equation (12) represents oval, mean square deviation and is：
Local derviation is taken about B, C, D, E and F to formula (10) respectively, it is 0 to enable local derviation, then can obtain one and include 5 equations
With the static determinacy equation group of 5 unknown numbers, can be solved to obtain 5 unknown parameters with matrix inversion, so that it is determined that oval.IfFor elliptical center (i.e. miss distance), then：
It is directly carried out respectively using radio star or synchronous satellite and poor channel error in pointing is demarcated, radio will be utilized
The antenna guiding calibration of star is demarcated and is corrected for antenna tracking with calibration shift, eliminates the error in pointing of antenna and poor interchannel,
Improve antenna tracking system precision.
The present invention chooses the sun or geosynchronous satellite is used as and poor channel determines signal source without tower beacon, using day line grating
Scanning joint three-dimensional figure imaging technique obtains respectively and poor channel three-dimensional figure, de- using being fitted based on elliptic curve
Target amount accurate measurement algorithm is respectively pair and poor directional diagram carries out centralized positioning respectively, reduces antenna tracking error, improves equipment
Tracking accuracy.
Description of the drawings
Fig. 1 is the present invention and poor channel error in pointing schematic diagram；
Pursuit path figure when Fig. 2 is inventive antenna raster scanning；
Fig. 3 is the present invention and channel three-dimensional radiation power radiation pattern；
Fig. 4 is the poor channel three-dimensional radiation power radiation pattern of the present invention；
Fig. 5 is the present invention and channel dual threshold elliptic curve miss distance extraction figure；
Fig. 6 is the poor channel dual threshold elliptic curve miss distance extraction figure of the present invention.
Specific embodiment
The present invention chooses the sun or geosynchronous satellite is used as and poor channel determines signal source without tower beacon, using day line grating
Scanning joint three-dimensional figure imaging technique obtains respectively and poor channel three-dimensional figure, de- using being fitted based on elliptic curve
Target amount accurate measurement algorithm is respectively pair and poor directional diagram carries out centralized positioning respectively.Specific implementation step is as follows：
(1) antenna scanning range and scanning speed are set according to antenna performance index and antenna system angular samples rate respectively
Degree.
(2) orientation stepping-in amount, constant bearing angle are calculated, pitching is scanned stepping by upper under (or by lower from upper)
It calculates.
(3) when pitching scans under most (or most upper), orientation is by orientation stepping-in amount stepping is calculated, and pitching is by lower from upper
(or by upper under) amount of being scanned calculates again.So repeatedly, until the scanning amount for completing the scanning area of setting calculates, and will
Antenna scanning trajectory when the generation of these scanning amounts is opposite.
(4) it calculates choosing and measures mesh during target (such as calibration tower, synchronous satellite or the strong radio source of the sun) calculating scanning
Target absolute time theoretical trajectory.
(5) antenna scanning trajectory when being superimposed opposite on the basis of the target absolute time theoretical trajectory calculated, such as Fig. 1 institutes
Show.Guide antenna carries out track following, as shown in Figure 2.
(6) when antenna carries out raster scanning, antenna bearingt, pitch angle and the aerial radiation received are acquired in real time
Power level, while antenna azimuth, pitch angle are individually subtracted purpose theoretical trajectory, record generation antenna relative bearing,
Pitch angle and poor channel radiated power level three-dimensional data.
(7) by MATLAB tools, acquired antenna relative bearing, opposite pitch angle and poor channel radiation are utilized
The three-dimensional data of power generates rectangular system antenna three-dimensional radiation directional diagram, as shown in Figure 3, Figure 4.
(8) acquisition of elliptic curve is calculated with centralized positioning, in order to improve the accuracy of elliptic curve fitting, first to original
Beginning data are split using dual threshold, and two segmentation planes are determined by threshold value, choose the hits between two divisional planes
According to the data as fitting.Obtained elliptic curve center is positioned using the principle of least square, as shown in Figure 5,6.
(9) it calculates and poor channel error in pointing：
Using elliptic curve center calculation as a result, can calculate and poor channel error in pointing, specific formula for calculation are as follows：
In formula：
ΔAFor orientation and poor channel error
θmΣFor with channel orientation miss distance
θmΔFor poor channel orientation miss distance
E is corresponding pitch angle
ΔEFor pitching and poor channel error in pointing
For with channel pitching miss distance
For with channel pitching miss distance
Using above-mentioned technical proposal, we by the use of the sun as signal source to typical 10 meters of Radiometric antennas into
It has gone and poor channel measurement error, measurement result is as follows：
ΔA=-0.015 °
ΔE=+0.009 °
From calibration result as can be seen that antenna system tracking accuracy can be improved using the measuring method：54 rads of orientation, bows
32 rads are faced upward, this is for the antenna system index orientation, each 72 rads of pitch system difference, significant effect.
Claims (4)
1. a kind of antenna and poor channel error in pointing are without tower scaling method, which is characterized in that include the following steps：
(1) using raster scan art, scanning range and sweep speed are set according to antenna parameter, control antenna is swept into line raster
It retouches, obtains the real-time angular and power data of antenna and poor channel respectively, form antenna three-dimensional figure；
(2) it is ellipse that in threshold range and poor channel angle data generation orientation, pitching two dimension are intercepted respectively using dual threshold method
Circular curve；
(3) acquisition and poor elliptic curve is fitted using the principle of least square and method of abnormal value removing and correction, to its center
It is positioned, is obtained and poor channel miss distance, so as to calculate corresponding and poor channel error in pointing；
The specific implementation step of the step (1) is as follows：
(a) antenna scanning range and sweep speed are set according to antenna performance index and antenna system angular samples rate respectively；
(b) orientation stepping-in amount is calculated, constant bearing angle, pitching is on from lower or calculated from being above scanned stepping by lower；
(c) when pitching scan from it is most lower or most upper when, orientation is by calculating orientation stepping-in amount stepping, and pitching is by lower from upper or by upper
The amount of being scanned calculates again under；So repeatedly, until the scanning amount for completing the scanning area of setting calculates, and these are scanned
Antenna scanning trajectory when amount generation is opposite；
(d) it calculates choosing and measures purpose target absolute time theoretical trajectory during target calculating scanning；The measurement target include calibration tower,
The strong radio source of synchronous satellite or the sun；
(e) antenna scanning trajectory when being superimposed opposite on the basis of the target absolute time theoretical trajectory calculated, guide antenna into
Row track following.
2. antenna according to claim 1 and poor channel error in pointing are without tower scaling method, it is characterised in that：The step
Suddenly (1) acquires antenna bearingt, pitch angle and the aerial radiation level received using power probe in real time, forms three-dimensional
Data, each group of one, data corresponding three-dimensional space point generate a width dimensional antenna antenna pattern by numerous points.
3. antenna according to claim 1 and poor channel error in pointing are without tower scaling method, it is characterised in that：Described is ellipse
The acquisition of circular curve and the specific algorithm of least square centralized positioning are as follows：
(1) initial data using dual threshold is split, two segmentation planes is determined by threshold value, choose two divisional planes it
Between sampled data as fitting data；
To N number of sampled pointManually choose two threshold value BcLowAnd BcUpSo that BcLowWith
BcUpMeet：
Remove section [BcLow,BcUp] other than numerical value, the sampled point retained forms new intensity dataI.e.：
So Subpoint is concentrated in an annulus in plane；
(2) oval least square fitting is carried out to one group of sampled point of target, can determine the center of target, long and short half
Axis and major axes orientation parameter；
If the general equation of conic section is：
If：
So equation (2) represents oval, mean square deviation and is：
Local derviation is taken about B, C, D, E and F to formula (3) respectively, it is 0 to enable local derviation, then can obtain one and include 5 equations and 5
The static determinacy equation group of unknown number can be solved to obtain 5 unknown parameters with matrix inversion, so that it is determined that oval；If
For elliptical center, then：
4. antenna according to claim 1 and poor channel error in pointing are without tower scaling method, it is characterised in that：Directly utilize
Radio star or synchronous satellite carry out respectively and poor channel error in pointing is demarcated, and will utilize the antenna guiding calibration of radio star
It demarcates and corrects for antenna tracking with calibration shift, eliminate the error in pointing of antenna and poor interchannel, improve antenna tracking system
Precision.
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| CN112162158B (en) * | 2020-09-03 | 2022-09-20 | 国家卫星气象中心(国家空间天气监测预警中心) | Method and device for evaluating pointing mismatch of antenna of on-orbit terahertz detector |
| CN112325840B (en) * | 2020-10-14 | 2023-03-31 | 中国人民解放军63921部队 | Directional antenna angle rapid calibration method based on celestial body tracking and scanning |
| CN112362080B (en) * | 2020-10-30 | 2021-12-24 | 中国人民解放军63921部队 | Spacecraft antenna on-orbit pointing calibration satellite-ground data synchronization deviation determination method |
| CN112417683B (en) * | 2020-11-20 | 2022-09-13 | 中国人民解放军63921部队 | Data processing method and device for on-orbit pointing calibration of antenna, electronic equipment and storage medium |
| CN113625063B (en) * | 2021-08-04 | 2024-01-02 | 上海无线电设备研究所 | Method for evaluating single pulse performance of antenna under complete machine condition |
| CN113467505B (en) * | 2021-08-10 | 2023-12-08 | 中国人民解放军63756部队 | Automatic capturing and tracking method for spacecraft |
| CN115267711B (en) * | 2022-09-27 | 2023-02-28 | 成都信息工程大学 | Antenna directivity gross error calibration method, device, equipment and storage medium |
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