In Global Navigation Satellite System (GNSS) receiver

the prior information of navigation filter can be used to aid signal acquisition in order to increase acquisition speed and improve sensitivity. By taking the BDS B1I signal as the research object

studies on the estimation of pseudo-random code phase

carrier Doppler

and NH code phase aided by navigation filter in GNSS receiver were carried out. First

the concept of “virtual route” was introduced to derive the computing method of pseudo-random code phase by directly using navigation filter. Then

the error sources and propagation characteristics of pseudo-random code phase and Doppler frequency were analyzed thoroughly. Finally

the theoretical simulation analysis of acquisition performance was conducted. Results show that when estimating pseudo-random code phase and Doppler frequency aided by navigation filter

the acquisition sensitivity was improved by 1.1 dB

and the mean acquisition time was 1 ms. By further aiding the estimation of the NH code phase

the coherent time was extended to 20 ms

the additional acquisition sensitivity improvement of 12.8 dB was achieved

and the corresponding mean acquisition time was 20 ms. The performance of signal acquisition could be improved by utilizing the prior information of navigation filter. Meanwhile

the power consumption caused by frequently running of unaided acquisition engine could be decreased. The algorithms proposed in this paper can be directly applied in GNSS receiver or GNSS/INS deep integration system.