CN103353922B - A kind of OTF observes scan method - Google Patents
A kind of OTF observes scan method Download PDFInfo
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- CN103353922B CN103353922B CN201310251925.9A CN201310251925A CN103353922B CN 103353922 B CN103353922 B CN 103353922B CN 201310251925 A CN201310251925 A CN 201310251925A CN 103353922 B CN103353922 B CN 103353922B
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Abstract
The present invention relates to a kind of OTF and observe scan method, a scanning area is divided into several rows by the method, scans multiple row separately every time, carries out interlacing scan repeatedly, complete the scanning of whole scanning area.Use interlacing scan method, in the case of the parameters such as antenna scanning speed, sampling interval, observation reference point time interval are identical, one region of single pass energy rapid Cover, reduces the factor impact on whole area distribution such as telescopic system performance and Changes in weather；Interleaved result is when doing heavily gridding and processing, the reference point that in one gridding region, the data of adjacent several row use is different time observation, the reference point of different rows is independent, the effective integral time that the sum time of integration is reference point of the reference point of different rows, so can be with the scanning times that 1/k, k are scanning area during progressive scan to the time of integration of reference point.
Description
Technical field
The present invention relates to radio astronomical telescope field, be specifically related to a kind of OTF and observe scan method.
Background technology
OTF(On The Fly) it is a kind of observation procedure of radio telescope, the region specified is scanned by antenna with constant speed, and is not tracked single lattice point, and multiple source points can share reference point and black matrix calibration, saves the time；Owing to whole region is quickly scanned, systematic function and weather over time on observation impact will be smaller.
In order to avoid causing the loss of information not due to sampling, OTF sweep parameter has some to limit, and the spacing such as adjacent two base lines can not be more than " Nyquist interval "；Sampling interval, i.e. single time of integration, it should obtain the shortest time required for one group of valid data more than receiver rear end；The required distance that sampling interval internal antenna is inswept is close with line space.
Having carried out the most intensive spatial sampling during OTF observation, these sampled points are not necessarily and are spacedly distributed, and need the most heavily gridding to process (regrid), to obtain the Grid data of usual form.
Traditional scan mode is that a scanning area is divided into several rows, start from a direction to progressively scan (such as Fig. 1), for a bigger scanning area, want quickly scan through one time, fast scan speed will be added, add fast scan speed and mean to shorten the time of integration of each point；After shortening data regrid meaning single sweep operation the time of integration of each point, each mesh point is short for the time of integration, and noise is big, needs multipass；Shorten the sweep time often gone and mean that antenna frequently turns around, be unfavorable for improving observed efficiency；If scanning speed is slow, the time completing single pass is longer, is unfavorable for the impact reducing telescopic system performance and Changes in weather to observation.
It addition, the time of integration to reference point is conditional, oversize meeting is lost time, and reduces observed efficiency, the shortest can increase noise；How long observing a reference point also to be restricted by factors such as receiver stability, angle of pitch variable quantities, be spaced oversize meeting and cause spectral line baseline uneven, the shortest meeting is lost time；During regrid, the value of certain mesh point thus puts the data of neighbouring a range of sampled point, is weighted with certain function according to this sampled point distance away from mesh point, generally uses gaussian function；Weighting these to effective integral time of reference point with the effective integral time to source equal be optimal.If the point in the range of this shares a reference point, then be exactly the time of integration of single reference point to the effective integral of reference point, the time of integration of single reference point will be equal to the effective integral time to source.
How in the case of being not added with fast scan speed, quickly whole region is once covered, reduce the impact on whole area distribution of the factor such as systematic function and Changes in weather；How on the premise of not increasing noise level, reduce the time of integration to reference point, improve observed efficiency, become the technical issues that need to address.
Summary of the invention
It is an object of the invention to overcome the defect of prior art, it is provided that a kind of energy whole region of rapid Cover, the OTF little to the time of integration of reference point observes scan method, improves observed efficiency.
The technical scheme realizing the object of the invention is: a kind of OTF observes scan method, and a scanning area is divided into several rows, scans multiple row separately every time, carries out interlacing scan repeatedly, complete the scanning of whole scanning area.
Described OTF observes scan method, specifically includes the following step:
S1. calculate and scan a total line number in region: n=sweep limits ÷ scanning line spacing
S2. setting scanning times k, calculate each number of scanning lines x:x=n/k, result of calculation rounds up number；
S3. according to the time used by the reference point observation interval set and scanning a line, after calculating scanning how many row, a reference point need to be observed；
S4. calculating scanning the pass m, i=1,2 of the i-th row ... n, m=i/x, result of calculation rounds up number；
When S5. calculating scanning the i-th row, line number y of actual scanning:
y=(i-1-x*(m-1))*k+m；
If S6. line number y of actual scanning reaches to observe the interval line number of reference point, then observe reference point；
S7. start to continue to scan on from y row；
S8.
Repeated execution of steps S4-S7, scans pass k to reaching to set, terminates.
The invention has the beneficial effects as follows:1. interlacing scan method is used, in the case of the parameters such as antenna scanning speed, sampling interval, observation reference point time interval are identical, one region of single pass energy rapid Cover, heavily gridding processes the spectral line of later position is that repeatedly result is average, time is separated by longer every time, point in the range of one gridding is distributed in different time sections, so the factor impacts on whole area distribution such as telescopic system performance and Changes in weather can be reduced；The most interleaved result is when doing heavily gridding and processing, the reference point that in one gridding region, the data of adjacent several row use is different time observation, the reference point of different rows is independent, the effective integral time that the sum time of integration is reference point of the reference point of different rows, so can be with the scanning times that 1/k, k are scanning area during progressive scan to the time of integration of reference point.
Accompanying drawing explanation
Fig. 1 be the present invention prior art in progressively scan schematic diagram；
Fig. 2 is the interlacing scan schematic diagram of the embodiment of the present invention 1；
Fig. 3 is the flow chart of the present invention.
Detailed description of the invention
As in figure 2 it is shown, a kind of OTF observes interlacing scan method, the n row of a scanning area is divided into 3 scanning, for the first time scanning 1,4,7 ... OK, second time scanning 2,5,8 ... OK, third time scanning 3,6,9 ... OK.
As it is shown on figure 3, OTF observation interlacing scan method specifically includes following steps:
S1. calculate and scan a total line number in region: n=sweep limits ÷ scanning line spacing
S2. setting scanning times k, calculate each number of scanning lines x:x=n/k, result of calculation rounds up number；
S3. according to the time used by the reference point observation interval set and scanning a line, after calculating scanning how many row, a reference point need to be observed；
S4. calculating scanning the pass m, i=1,2 of the i-th row ... n, m=i/x, result of calculation rounds up number；
When S5. calculating scanning the i-th row, line number y of actual scanning:
y=(i-1-x*(m-1))*k+m；
If S6. line number y of actual scanning reaches to observe the interval line number of reference point, then observe reference point；
S7. start to continue to scan on from y row；
S8.
Repeated execution of steps S4-S7, scans pass k to reaching to set, terminates.
Scanning times k processes the combined factors such as requirement consider according to total time used by one district of scanning and receiver stability, later data, typically divides 2-4 time.
Claims (2)
1. On The Fly observes a scan method, and a scanning area is divided into several rows, scans multiple row separately every time, carries out interlacing scan repeatedly, complete the scanning of whole scanning area；
It is characterized in that, the method specifically includes the following step:
S1. calculate and scan a total line number in region: n=sweep limits ÷ scanning line spacing
S2. setting scanning times k, calculate each number of scanning lines x:x=n/k, result of calculation rounds up number；
S3. according to the time used by the reference point observation interval set and scanning a line, after calculating scanning how many row, a reference point need to be observed；
S4. calculating scanning the pass m, i=1,2 of the i-th row ... n, m=i/x, result of calculation rounds up number；
When S5. calculating scanning the i-th row, line number y of actual scanning:
y=(i-1-x*(m-1))*k+m；
If S6. line number y of actual scanning reaches the interval line number of the need observation reference point that S3 calculates, then observe reference point；
S7. start to continue to scan on from y row；
S8. repeated execution of steps S4-S7, to reaching to set scanning times k, end.
On The Fly the most according to claim 1 observes scan method, it is characterized in that, the value of described scanning times k is 2-4.
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| CN201310251925.9A CN103353922B (en) | 2013-06-21 | 2013-06-21 | A kind of OTF observes scan method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6484306B1 (en) * | 1999-12-17 | 2002-11-19 | The Regents Of The University Of California | Multi-level scanning method for defect inspection |
| CN1520179A (en) * | 2003-02-03 | 2004-08-11 | 三星电子株式会社 | Method and appts. for coding/decoding interlaced scanning video signal |
| CN101976297A (en) * | 2010-09-30 | 2011-02-16 | 中国科学院国家天文台 | Processing method of moon brightness temperature data observed by foundation single antenna |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6484306B1 (en) * | 1999-12-17 | 2002-11-19 | The Regents Of The University Of California | Multi-level scanning method for defect inspection |
| CN1520179A (en) * | 2003-02-03 | 2004-08-11 | 三星电子株式会社 | Method and appts. for coding/decoding interlaced scanning video signal |
| CN101976297A (en) * | 2010-09-30 | 2011-02-16 | 中国科学院国家天文台 | Processing method of moon brightness temperature data observed by foundation single antenna |
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