A BeiDou Signal Acquisition Approach Using Variable Length Data Accumulation based on Signal Delay and Multiplication

Area of Science:

• Satellite Navigation Systems
• Signal Processing
• Geodesy

Background:

• BeiDou B1/B3 signals lack pilot components, complicating acquisition.
• The Neumann-Hoffman code can cause bit sign transitions.
• Existing delay and multiplication (DAM) methods are limited to strong signals.

Purpose of the Study:

• To propose a novel DAM-based approach for acquiring weak BeiDou satellite signals.
• To address the challenges of bit sign transitions and low signal intensity in BeiDou signal acquisition.

Main Methods:

• Variable Length Data Accumulation (VLDA) method proposed.
• Analysis of DAM performance with varying delays.
• Periodic accumulation of long-term signals with Doppler frequency shift compensation.
• Fast-Fourier-Transform based parallel code phase algorithm utilized for acquisition.

Main Results:

• VLDA demonstrates superior acquisition sensitivity compared to traditional non-coherent integration.
• VLDA achieves equivalent sensitivity with 27.5% fewer calculations.
• Experimental results confirm the feasibility and effectiveness of the VLDA method.

Conclusions:

• The proposed VLDA method effectively solves the bit sign transition problem for weak BeiDou signals.
• VLDA offers a more efficient and feasible solution for BeiDou signal acquisition.
• The approach enhances the reliability of satellite navigation systems.