CN103698754B - A kind of broadband time delay integration measurement method - Google Patents
A kind of broadband time delay integration measurement method Download PDFInfo
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- CN103698754B CN103698754B CN201310716566.XA CN201310716566A CN103698754B CN 103698754 B CN103698754 B CN 103698754B CN 201310716566 A CN201310716566 A CN 201310716566A CN 103698754 B CN103698754 B CN 103698754B
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Abstract
The invention discloses a kind of broadband time delay integration measurement method, adopt linear FM signal as Time delay measurement signal; Utilize high power sample rate to set up comparison tables of data, sample rate is higher, and the tables of data of foundation is meticulousr, estimation to peak value is more accurate, the impact of taking into account system noise on signal amplitude and the needs of practical application, 8 times of choosing sample rate and be actual sample rate, also can be higher. Be a kind of method that mode based on waveform comparison look-up table is estimated more accurate time delay, can measure more accurately the echo time delay of broadband system.
Description
Technical field
The invention belongs to communication technical field, relate to a kind of broadband time delay integration measurement method.
Background technology
Under narrow band mode, traditional latency measurement adopts the point-frequency signal of centre frequency as test signal more, and for broadband signal, the feature of centre frequency has been difficult to replace the characteristic of whole frequency band, so adopt broadband signal as channel test signal. Conventionally adopt the signal location estimation of peak of Wide-band Pulse Compression Signal envelope, but because the sample frequency of data collecting system is limited, have a certain impact for the Measurement accuracy of broadband time delay, the certainty of measurement of time delay is exactly time sampling precision. If sampling time interval is 4ns, the certainty of measurement of time delay is also 4ns so.
Summary of the invention
In order to overcome defect of the prior art, the invention provides a kind of broadband time delay integration measurement method, be a kind of method that mode based on waveform comparison look-up table is estimated more accurate time delay, can measure more accurately the echo time delay of broadband system. Its technical scheme is,
A kind of broadband time delay integration measurement method, comprises the following steps:
1) first produce wide-band LFM signal, described signal bandwidth is consistent with the actual instant bandwidth of radar;
2) described signal obtains its amplitude envelops after by pulse compression;
3) maximum point in search signal envelope and time a little bigger numerical values recited, and record maximum point and time a little bigger index value, the corresponding time delay of this value, true time delay should be at maximum place, or between maximum and second largest value;
4) use the larger numerical value of index value on the numeric ratio that index value is less, obtain a ratio;
5) adopt the emulated data of high sampling rate to set up a ratio data table, be generally 8 times of actual sample rate;
6) ratio that utilizes step 4) to obtain is tabled look-up, and further accurately estimates the accurate location of this signal peak, i.e. Time Delay of Systems.
The present invention adopts linear FM signal as Time delay measurement signal; Utilize high power sample rate to set up comparison tables of data, sample rate is higher, and the tables of data of foundation is meticulousr, estimation to peak value is more accurate, the impact of taking into account system noise on signal amplitude and the needs of practical application, 8 times of choosing sample rate and be actual sample rate, also can be higher.
Beneficial effect of the present invention:
This method is not improving under the prerequisite of systematic sampling rate, and the comparison of tabling look-up of the relative size by near the maximum to signal peak and second largest value, can effectively significantly improve the certainty of measurement to signal peak position, Measurement accuracy Time Delay of Systems.
Brief description of the drawings
Fig. 1 is time delay integration measurement method schematic diagram.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is described in more detail.
As shown in Figure 1, on figure, be the main lobe peak value portion waveshape schematic diagram of wide-band LFM signal after pulse compression. If when time delay is number of cycles, the sampled value obtaining should be the some value of 1,9,17 correspondences, maximum sampled value application 9, and inferior large sampled value should be 1 or 17; If when time delay was 1/4 cycle, the sampled value obtaining is the value of 3,11 correspondences; If when time delay was 2/4 cycle, the sampled value obtaining is the value of 5,13 correspondences; If when time delay was 3/4 cycle, the sampled value obtaining is the value of 7,15 correspondences. Obtain respectively after the maximum and second largest value of the peak value after pulse compression, as seen from the figure, in the time that fractional part time delay is respectively 4 kinds of different situations, the value on the left side and the ratio of the value on the right should belong to respectively different intervals, and possess monambiguity. Can determine the time delay of its fractional cycle part by the mode of tabling look-up.
Suppose that bandwidth B is 200MHz(-100MHz ~ 100MHz), pulsewidth T is the pulse linear FM signal of 40us, after DDC, base band data rate 250MHz(is that data break time T s is 4ns), through pulse compression, after coherent accumulation, by the method for the sample sequence Character Comparison of sequence and SINC function is carried out to center estimation, i.e. the time difference of crest position and sampling point position, obtain time delay corrected value, be accurate to 1ns (Ts/4).
Adopt the method, do not improving under the prerequisite of sample rate, Time Delay of Systems certainty of measurement rises to 4 times of sample rate.
The above; it is only preferably detailed description of the invention of the present invention; protection scope of the present invention is not limited to this; any be familiar with those skilled in the art the present invention disclose technical scope in, the simple change of the technical scheme that can obtain apparently or equivalence replace all fall within the scope of protection of the present invention.
Claims (1)
1. a broadband time delay integration measurement method, is characterized in that, comprises the following steps:
1) first produce wide-band LFM signal, described signal bandwidth is consistent with the actual instant bandwidth of radar;
2) described signal obtains its amplitude envelops after by pulse compression;
3) maximum point in search signal envelope and time a little bigger numerical values recited, and record maximum point and time a little bigger index value,The corresponding time delay of this index value, true time delay should be at maximum place, or between maximum and second largest value;
4) use the larger numerical value of index value on the numeric ratio that index value is less, obtain a ratio;
5) for step 4) in ratio, adopt the emulated data of high sampling rate to set up a ratio data table, adopt for actual8 times of sample rate;
6) utilize step 5) the ratio data table that obtains, further accurately estimate the accurate location of this signal peak, i.e. systemTime delay.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310716566.XA CN103698754B (en) | 2013-12-23 | 2013-12-23 | A kind of broadband time delay integration measurement method |
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| CN201310716566.XA CN103698754B (en) | 2013-12-23 | 2013-12-23 | A kind of broadband time delay integration measurement method |
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| CN103698754A CN103698754A (en) | 2014-04-02 |
| CN103698754B true CN103698754B (en) | 2016-05-04 |
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| CN201310716566.XA Expired - Fee Related CN103698754B (en) | 2013-12-23 | 2013-12-23 | A kind of broadband time delay integration measurement method |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5987392A (en) * | 1997-08-14 | 1999-11-16 | Tucker; Lawrence J. | Wave form peak detector |
| CN102843104A (en) * | 2011-04-29 | 2012-12-26 | 快捷半导体(苏州)有限公司 | Envelope extraction with reduced bandwidth for power modulation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6873667B2 (en) * | 2000-01-05 | 2005-03-29 | Texas Instruments Incorporated | Spread spectrum time tracking |
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2013
- 2013-12-23 CN CN201310716566.XA patent/CN103698754B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5987392A (en) * | 1997-08-14 | 1999-11-16 | Tucker; Lawrence J. | Wave form peak detector |
| CN102843104A (en) * | 2011-04-29 | 2012-12-26 | 快捷半导体(苏州)有限公司 | Envelope extraction with reduced bandwidth for power modulation |
Non-Patent Citations (2)
| Title |
|---|
| Pulse Detection Algorithm for Line-of-Sight (LOS) UWB Ranging Applications;Z. N. Low等;《IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS》;20051231;第4卷;第63-67页 * |
| 带限信号时延估计快速算法研究;沈彩耀等;《信息工程大学学报》;20070331;第8卷(第1期);第77-80页 * |
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| CN103698754A (en) | 2014-04-02 |
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Granted publication date: 20160504 Termination date: 20191223 |