Chinese Space Science and Technology ›› 2018, Vol. 38 ›› Issue (3): 45-53.doi: 10.16708/j.cnki.1000-758X.2018.0034

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Weighted discriminator function based tracking method forbinary offset carrier signals

YAN Tao*, WANG Ying, QU Bo, WANG Guoyong, LEI Wenying, BIAN Lang   

  1. China Academy of Space Technology (Xi'an), Xi'an 710100, China
  • Received:2017-09-20 Revised:2017-11-24 Accepted:2018-03-14 Online:2018-06-25 Published:2018-03-06

Abstract:

To remove the ambiguity threat and maintain the outstanding code tracking performance of binary off set carrier (BOC) signals, an unambiguous tracking method based on weighted discriminator function (WDF) was developed. The WDF combined the noncoherent early minus late power (NELP) discriminator with the sub carrier phase cancellation technique (SCPC) discriminator to generate a discriminator function without false lock points for BOC signal tracking. Regarding BOC (10,5) signal, the simulation results show that compared with SCPC, pseudo correlation function based unambiguous delay lock loop (PUDLL) and symmetrical pulse ambiguity removing (SPAR) successively, the proposed WDF has2.5dB, 5.5dB and 8.3dB improvement in terms of code tracking error. The multipath errors of WDF method are reduced to 60.4%, 32.8% and 38.0%, respectively. Therefore, the proposed WDF is an effective BOC signal unambiguous tracking method without standing performance.

Key words:

binary offset carrier, unambiguous tracking, weighted discriminator function, code tracking performance, global navigation satellite system