CN102680987A - Difference-multiplication capturing method for GNSS signal under low SNR environment - Google Patents
Difference-multiplication capturing method for GNSS signal under low SNR environment Download PDFInfo
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- CN102680987A CN102680987A CN2012101771572A CN201210177157A CN102680987A CN 102680987 A CN102680987 A CN 102680987A CN 2012101771572 A CN2012101771572 A CN 2012101771572A CN 201210177157 A CN201210177157 A CN 201210177157A CN 102680987 A CN102680987 A CN 102680987A
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Abstract
The invention relates to a difference-multiplication capturing method for a GNSS (Global Navigation Satellite System) signal under a low SNR (Signal to Noise Ratio) environment. The system comprises a pre-correlation integrator module, a time-delay module, a difference multiplication module and a threshold judgment module. The method has the advantages that the GNSS signal can be captured under the low SNR environment, improves the capturing performance of a receiver, and effectively shortens the capturing time.
Description
Technical field
The present invention relates to a kind of new GNSS signal acquisition methods.More particularly, be a kind of correlativity of useful signal and irrelevance of noise signal utilized, effectively improve the method for acquisition performance thereby multiply each other continuously through preparatory correlated results to different time.
Background technology
Realize in the bigger ground noise that the way of taking usually is that preparatory correlation integral result is carried out relevant for a long time or non-coherent integration computing to the catching of weak GNSS signal, the real-time of signal capture is relatively poor.
This signal acquisition methods is to shorten capture time, improves the effective technology means of acquisition performance.It utilizes the correlativity of useful signal and the irrelevance of noise signal, through multiplying each other continuously of the preparatory correlated results of different time, has significantly improved the output signal-to-noise ratio of capture circuit, thereby has realized catching fast of GNSS signal under the low signal-to-noise ratio condition.
Summary of the invention
The objective of the invention is to: the difference that the proposes a kind of GNSS signal catching method that multiplies each other, can shorten capture time effectively, improve acquisition performance.
Technical scheme of the present invention is: the difference of the GNSS signal catching method that multiplies each other under a kind of low signal-to-noise ratio condition, it is made up of multiply each other module and threshold judgement module of preparatory correlation integral module, time delay module, difference.GNSS signal after the correlation integral module is changed A/D in advance carries out associative operation, and correlation time is for receiving the integral multiple sign indicating number cycle of signal spread-spectrum sign indicating number in advance.Time delay module carries out delay operation to the output result of correlation integral module, and delay time is preparatory correlation time.Difference multiplies each other, and module is delayed time afterwards to all and the correlation integral results of current inputs carry out the conjugate multiplication computing.Relevant peaks after the threshold judgement module multiplies each other to difference carries out threshold judgement and the result is caught in output.
Advantage of the present invention is: a kind of difference catching method that multiplies each other is provided, and this method can effectively improve the acquisition performance of GNSS signal receiver under the low signal-to-noise ratio condition.
Description of drawings
Fig. 1 is that difference multiplies each other and catches theory diagram.
Fig. 2 adopts difference multiply each other catching method and the low signal-to-noise ratio surface scattering GNSS Signal Processing result contrast of general non-coherent integration catching method to actual acquisition.
Embodiment
In the face of doing, the present invention describes in further detail down.Referring to Fig. 1, the present invention is made up of multiply each other module and threshold judgement module of preparatory correlation integral module, time delay module, difference.
The function that the preparatory correlation integral module of A is accomplished is: the GNSS signal to after the A/D conversion carries out associative operation, and correlation time is for receiving the integral multiple sign indicating number cycle of signal spread-spectrum sign indicating number in advance.The result of the i time preparatory correlation integral is expressed as Z (i)
The function that the B time delay module is accomplished is: the output result to the correlation integral module carries out delay operation, and delay time is preparatory correlation time.N back i.e. the i-n time the preparatory correlation integral result that delay time is expressed as Z (i-n).
The C difference function that module accomplishes that multiplies each other is: the correlation integral results to all time-delay backs and current inputs carry out the conjugate multiplication computing.The difference multiplied result is expressed as:
Y(i)=Z(i)Y
*(i-1)
The function that D threshold judgement module is accomplished is: the relevant peaks after difference is multiplied each other carries out threshold judgement and the result is caught in output.
Be used for low signal-to-noise ratio surface scattering GNSS signal receiver (being not limited to) to this method to the actual acquisition Signal Processing; It is as shown in Figure 2 to catch the result; Among the figure, the left side is for adopting the multiply each other result of catching method of difference, and the difference number of times that multiplies each other is (being not limited to) 4 times; The right is for adopting the result of general non-coherent integration catching method, and non-coherent integration times is (being not limited to) 50 times.The correlation integral time is (being not limited to) 1ms in advance.Contrast is visible, and this method has realized higher output signal-to-noise ratio with shorter capture time, thereby has improved acquisition performance.
Claims (3)
1. the difference of the GNSS signal quick capturing method that multiplies each other under the new low signal-to-noise ratio condition, it is made up of multiply each other module and threshold judgement module of preparatory correlation integral module, time delay module, difference.
2. catching method according to claim 1 is characterized in that time delay module delays time to the output result of preparatory correlation integral module, and delay time is the preparatory correlation integral time, promptly receives the integral multiple sign indicating number cycle of signal spread-spectrum sign indicating number.
3. catching method according to claim 1 is characterized in that the difference module that multiplies each other carries out the conjugate multiplication computing to the preparatory correlation integral results of all time-delay backs and current inputs, carries out threshold judgement behind the multiplied result delivery and the result is caught in output.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109150234A (en) * | 2018-08-07 | 2019-01-04 | 电子科技大学 | A kind of direct sequence signal transmission method based on direct differential coherent accumulation |
Citations (3)
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|---|---|---|---|---|
| CN101581776A (en) * | 2009-06-19 | 2009-11-18 | 哈尔滨工业大学 | Weak GNSS signal differential coherent accumulative capturing method |
| CN101771436A (en) * | 2010-01-04 | 2010-07-07 | 清华大学 | Method for capturing spread spectrums in multipath environment |
| CN102323601A (en) * | 2011-05-27 | 2012-01-18 | 哈尔滨工程大学 | Method for capturing GNSS-BOS (Global Navigation Satellite System-Binary Offset Carrier) modulation signal |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101581776A (en) * | 2009-06-19 | 2009-11-18 | 哈尔滨工业大学 | Weak GNSS signal differential coherent accumulative capturing method |
| CN101771436A (en) * | 2010-01-04 | 2010-07-07 | 清华大学 | Method for capturing spread spectrums in multipath environment |
| CN102323601A (en) * | 2011-05-27 | 2012-01-18 | 哈尔滨工程大学 | Method for capturing GNSS-BOS (Global Navigation Satellite System-Binary Offset Carrier) modulation signal |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109150234A (en) * | 2018-08-07 | 2019-01-04 | 电子科技大学 | A kind of direct sequence signal transmission method based on direct differential coherent accumulation |
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Application publication date: 20120919 |