CN104459319A - Short base line interferometer vector superposition phase demodulation method - Google Patents
Short base line interferometer vector superposition phase demodulation method Download PDFInfo
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- CN104459319A CN104459319A CN201410709135.5A CN201410709135A CN104459319A CN 104459319 A CN104459319 A CN 104459319A CN 201410709135 A CN201410709135 A CN 201410709135A CN 104459319 A CN104459319 A CN 104459319A
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Abstract
The invention relates to a short base line interferometer vector superposition phase demodulation method. The short base line interferometer vector superposition phase demodulation method comprises the steps that firstly, two paths of original intermediate frequency signals of a short base line interferometer are transformed into baseband signals through down-conversion, two channel baseband complex signal sequences x(m) and y(m) are obtained, conjugation multiplication is conducted on x(m) and y(m) to obtain a new sequence phi(m)=x(m)*y(m)*; secondly, vector superposition is conducted on the amplitude information and the phase information of the sequence phi(m), and a vector superposition sum (please see the formula in the specification) is obtained; finally, the vector superposition sum is used for obtaining phase positions, and the phase position difference (please see the formula in the specification) of the two paths of signals is obtained. By means of the short base line interferometer vector superposition phase demodulation method, phase demodulation ambiguity among various complex modulation signals under low signal to noise ratios can be well eliminated, the calculation time is short, the space complexity is low, and high-precision real-time measurement of the phase positions of the two paths of signals can be achieved.
Description
Technical field
The present invention relates to the High Resolution Phase Detecting Method of short-baseline interferometer two paths of signals, particularly relate to the high precision method for real-time measurement of between signal, phase difference measurement is fuzzy under low signal-to-noise ratio elimination and two paths of signals phase differential.
Background technology
Phase differential between the same emitter Signals that short-baseline interferometer direction-finding system utilizes different units in aerial array to receive carries out direction finding.Short-baseline interferometer direction finding, as a passive gordian technique of scouting location, is used widely because of features such as its direction finding precision are high and measuring speed is fast.But Short baseline direction-finding system also exists phase difference measurement fuzzy problem under low signal-to-noise ratio; The whether accurate direct relation of phase differential the accuracy of direction finding, remarkable to the direction finding influential effect of whole direction-finding system.Therefore, ensure that the measuring accuracy of phase differential has become the key point of Short baseline direction-finding system.The fuzzy main cause of phase difference measurement is that signal phase difference may be under low signal-to-noise ratio
with
neighbouring mutually folding, if directly ask for average to phase differential, will cause average deviation true value, especially when between signal, phase differential is close
with
time, the fuzzy problem caused is even more serious.
Under low signal-to-noise ratio, between signal, phase difference measurement fuzzy problem can utilize the method for vector progressive mean by fuzzy for phase difference measurement elimination, thus is solved preferably.For phase difference measurement deblurring problem, current main method has: 1) utilize phase differential average statistical, carries out folding again to measurement fuzzy value.Because phase differential can not suddenly change in short Measuring Time between signal, each phase difference value measured is judged according to current average, exceed certain limit just folding again, thus will measure fuzzy value elimination; 2) dynamically determine that phase differential naturalization is interval, phase differential average signal being arrived to forward position is added up, if this average is close
or
, then phase differential naturalization interval is defined as
if this average is close to 0, then phase differential naturalization interval is defined as
, can phase difference measurement be prevented so fuzzy.
Said method solves simple signal phase difference measurement folding problem to a certain extent, but the fuzzy problem that still there are some and need to solve is removed to linear FM signal and phase-coded signal: 1) phase function of phase-coded signal exists the saltus step of phase differential symbol in code element catastrophe point, absolute value is there is identical in phase difference measurement, the value that two kinds of symbols are contrary, the measured value of wherein negligible amounts is needed to fold into a fairly large number of one side, if that statistical value during measuring cannot be predicted by the method for average statistical occupy the majority, cannot measure in real time; 2) linear FM signal phase function linearly increases along with Measuring Time, repeatedly may fold in one-shot measurement, the method dynamically determining phase differential naturalization interval can not be used to eliminate folding.
Summary of the invention
The present invention, for solving under low signal-to-noise ratio phase difference measurement fuzzy problem between all kinds of complex modulated signal, by carrying out carrying out after vector is multiplied vector progressive mean to two channel baseband complex signals, measures when can realize the high-precision real of two paths of signals phase differential again.
The technical solution that the present invention adopts for its technical matters of solution is: first original for short-baseline interferometer two-way intermediate-freuqncy signal is down-converted to baseband signal, obtains two channel baseband complex signal sequences
with
, will
with
conjugate multiplication obtain new sequence
, then to sequence
amplitude information and phase information carry out vector superposed, SPA sudden phase anomalies point is cancelled in cumulative process, does not affect the measurement of phase place average, obtain vector superposed and
, finally utilize vector superposed and ask for phase place, the phase differential obtaining two paths of signals is
.
The present invention is compared with art methods, when Signal-to-Noise is lower, algorithm shows separates phase difference measurement fuzzy performance preferably, and the phase difference measurement effectively can eliminating all kinds of complex modulated signal is fuzzy, and possesses less computing time, space complexity.
Accompanying drawing explanation
Accompanying drawing 1 is the schematic diagram of short-baseline interferometer vector superposed phase detecting method key algorithm step.
Embodiment
The embodiment of the vector superposed phase detecting method of short-baseline interferometer is provided below in conjunction with accompanying drawing 1.
(1) conjugate multiplication: set two channel baseband sampled signals as complex sequences
with
, first to sequence
ask for conjugation and obtain sequence
,
Again by sequence
with
be multiplied and obtain new sequence:
；
(2) vector adds up: if detect that signal arrives, then start sequence
real part and imaginary part add up respectively, until signal ended, obtain new vector
;
(3) vector phase detection: obtain phase difference vector after vector has added up
, ask for the phase place of this vector
, then the phase place obtained
be two channel signals remove phase differential fuzzy after phase differential average.
Claims (1)
1. the vector superposed phase detecting method of short-baseline interferometer, is characterized by: first original for short-baseline interferometer two-way intermediate-freuqncy signal is down-converted to baseband signal, obtains two channel baseband complex signal sequences
with
, will
with
conjugate multiplication obtain new sequence
, then to sequence
amplitude information and phase information carry out vector superposed, SPA sudden phase anomalies point is cancelled in cumulative process, does not affect the measurement of phase place average, obtain vector superposed and
, finally utilize vector superposed and ask for phase place, the phase differential obtaining two paths of signals is
.
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| CN201410709135.5A CN104459319A (en) | 2014-11-27 | 2014-11-27 | Short base line interferometer vector superposition phase demodulation method |
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|---|---|---|---|
| CN201410709135.5A CN104459319A (en) | 2014-11-27 | 2014-11-27 | Short base line interferometer vector superposition phase demodulation method |
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|---|---|
| CN104459319A true CN104459319A (en) | 2015-03-25 |
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|---|---|---|---|
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Cited By (3)
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| CN105203844A (en) * | 2015-09-18 | 2015-12-30 | 广东电网有限责任公司电力科学研究院 | Zero initial phase modulation method and system for electric power signals |
| CN107219496A (en) * | 2017-06-16 | 2017-09-29 | 中国电子科技集团公司第二十八研究所 | A kind of improved correlation interferometer phase detecting method |
| CN107561357A (en) * | 2017-07-05 | 2018-01-09 | 中国电子科技集团公司第三十八研究所 | A kind of high-precision instantaneous frequency measurement method and apparatus based on channelizing |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203844A (en) * | 2015-09-18 | 2015-12-30 | 广东电网有限责任公司电力科学研究院 | Zero initial phase modulation method and system for electric power signals |
| CN105203844B (en) * | 2015-09-18 | 2018-04-03 | 广东电网有限责任公司电力科学研究院 | The zero initial phase modulator approach and system of electric power signal |
| CN107219496A (en) * | 2017-06-16 | 2017-09-29 | 中国电子科技集团公司第二十八研究所 | A kind of improved correlation interferometer phase detecting method |
| CN107219496B (en) * | 2017-06-16 | 2019-06-11 | 中国电子科技集团公司第二十八研究所 | A kind of improved correlation interferometer phase detecting method |
| CN107561357A (en) * | 2017-07-05 | 2018-01-09 | 中国电子科技集团公司第三十八研究所 | A kind of high-precision instantaneous frequency measurement method and apparatus based on channelizing |
| CN107561357B (en) * | 2017-07-05 | 2020-08-14 | 中国电子科技集团公司第三十八研究所 | High-precision instantaneous frequency measurement method and device based on channelization |
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