scholarly journals A New Acquisition Algorithm with Elimination Side Peak for All BOC Signals

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Fang Liu ◽  
Yongxin Feng
Keyword(s):  
Correlation Function ◽  
Global Navigation Satellite Systems ◽  
Navigation Satellite ◽  
Binary Offset Carrier ◽  
Side Peak ◽  
Acquisition Performance ◽  
Satellite Systems ◽  
Simulation Results ◽  
Global Navigation Satellite ◽  
Better Than

A new inhibition side peak acquisition (ISPA) algorithm is proposed for binary offset carrier (BOC) modulated signals, which will be utilized in global navigation satellite systems (GNSS). We eliminate all side peaks of the BOC correlation function (CF) by structuring special sequences composed of PRN code and cycle rectangular sequences. The new algorithm can be applied to both generic sine- and cosine-phased BOC signals, as well as to all modulation orders. Theoretical and simulation results demonstrate that the new algorithm can completely eliminate the ambiguity threat in the acquisition process, and it can adapt to lower SNR. In addition, this algorithm is better than the traditional algorithms in acquisition performance and inhibition side peak ability.

scholarly journals Formation Algorithms and Properties of Binary Quasi-Orthogonal Code Sequence of Modern Satellite Systems

2018 ◽  
Vol 7 (4.38) ◽  
pp. 1205
Author(s):  
Vladimir Petrovich Pashintsev ◽  
Igor Anatolyevich Kalmykov ◽  
Aleksandr Pavlovich Zhuk ◽  
Dmitrii Viktorovich Orel ◽  
Elena Pavlovna Zhuk
Keyword(s):  
Correlation Function ◽  
Global Navigation Satellite Systems ◽  
Navigation Satellite ◽  
Satellite Systems ◽  
Navigation Signal ◽  
Global Navigation ◽  
Navigation Signals ◽  
Global Navigation Satellite ◽  
Orthogonal Code ◽  
Element Series

Increased number of threats to user interface of navigation signals, mainly in the form of suppression of navigation signals by jamming as well as navigation signal spoofing by false signals, assumes development of counter measures including improvement of structure security of navigation signals on the basis of stochastic use of code sequences which are ranging codes. This article proves the required number of unique discrete code sequences which can improve structure security of navigation signal in global navigation satellite system upon their stochastic use. Properties of discrete quasi-orthogonal code sequences are estimated which are used and proposed for use in global navigation satellite systems with channel code division, they are compared with optimum values of code balancing, number of element series and lower bounds of maximum lateral peaks of aperiodic auto-correlation function and maximum peaks of aperiodic mutual-correlation function. The experimental results show that the minimum values of the considered correlation functions of discrete quasi-orthogonal code sequences of known global navigation satellite systems exceed the lower bound by 3–6 times. The performances of code balancing and element series of discrete quasi-orthogonal code sequences of the known global navigation satellite systems satisfy in average the allowable intervals. The number of source lines of discrete quasi-orthogonal code sequences of the known global navigation satellite systems is significantly lower than their umber required for improvement of structure security of navigation signal based on their stochastic use. On the basis of the revealed drawbacks of the known discrete quasi-orthogonal code sequences, the necessity to develop new methods is substantiated allowing to obtain their required number together with statistic properties comparable with the best values of discrete quasi-orthogonal code sequences applied as navigation signals in global navigation satellite systems.  

A Multipath Cancellation Method Based on TK Operator for BOC Signals

2013 ◽  
Vol 680 ◽  
pp. 454-459
Author(s):  
Zhong Liang Deng ◽  
Lei Yang ◽  
Lu Yin ◽  
Yue Xi
Keyword(s):  
Global Navigation Satellite Systems ◽  
Binary Offset Carrier ◽  
Side Peak ◽  
Satellite Systems ◽  
Low Snr ◽  
Navigation Signals ◽  
Multipath Signals ◽  
Global Navigation Satellite ◽  
The Right ◽  
New Generation

The new generation of global navigation satellite systems will apply binary offset carrier (BOC) modulation technique, which can efficiently split the spectrums of navigation signals using the same frequency so as to reduce the interferences among different systems. But the autocorrelation function of BOC modulated signals has the drawback of multimodality, so it’s very hard to synchronize to the right peak when acquiring and tracking signals, especially under low SNR circumstances, which can decrease the positioning accuracy and even lead to wrong positioning results. Meanwhile, if there are multipath signals mixed in the receiving signal, the autocorrelation curve will be greatly distorted, and the number of side-peak will also increase exaggeratedly, which could deteriorate the situation mentioned above. A multipath cancellation method based on TK (Teager-Kaiser) operator is proposed in this article, which could not only detect the right peak in the autocorrelation curve, but also eliminate all the other multipath signals. As a result, this method could avoid the false lock of code phase and guarantee the high precision fix results.

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