Weak BeiDou signal acquisition in the presence of sign transition over multiple periods

Abstract

Summary To improve the acquisition sensitivity of weak BeiDou signal, multiple periods accumulation is applied. However, as the Neumann‐Hoffman code is modulated onto the BeiDou MEO/IGSO signal, the sign transition may occur in even 1‐ms interval. This paper proposes a modified multiblock zero padding method to solve the sign transition problem for weak BeiDou signal acquisition. The proposed modified multiblock zero padding method applies differentially coherent accumulation to detect the weak signal. To evaluate the performance of the proposed method, the Monte Carlo simulation experiments are conducted. Simulation experiments have demonstrated the validity and availability of the proposed method, which can achieve weak signal acquisition under the BeiDou‐challenged environment.

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

“…DBZP method has great potential to acquire pretty weak BeiDou signal as weak as 22 dBHz [14]. However, the DBZP method is generally considered to have low efficiency because half of the signal power is wasted, which increases the computation complexity [25]. Furthermore, many efforts have been made in block-level correlation to made improvements in the DBZP method [24][25][26][27].…”