Efficient BeiDou DBZP‐based weak signal acquisition scheme for software‐defined receiver

Meng, Qian; Liu, Jianye; Zeng, Qinghua; Feng, Shaojun; Xu, Rui

doi:10.1049/iet-rsn.2017.0589

Cited by 5 publications

(4 citation statements)

References 22 publications

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“…However none of them is able to complete the whole task independently due to their vulnerability to interferences and limitations to application scenarios. 19–21 To satisfy the above navigation requirements and evade the drawbacks of single sensor, multi-sensor information fusion technology is widely adopted in autonomous vehicles navigation solutions with the assist of high definition (HD) map or vehicle-to-everything (V2X) technology. 22,23 By contrast, the navigation solution and positioning model in civil aviation is simpler and more mature.…”

Section: Integrity Application From Civil Aviation To Autonomous Vehimentioning

confidence: 99%

Integrity for autonomous vehicles and towards a novel alert limit determination method

Meng

Hsu

2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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Integrity is one critical performance indicator for navigation in safety-critical applications such as autonomous vehicles. Alert limit is one of the representative parameters in integrity monitoring which defines the maximum tolerable positioning error for an operation to safely proceed. But the integrity requirements for global navigation satellite system (GNSS) assessment are quite different from those for other applications. For autonomous vehicles, a reasonable alert limit needs to ensure the vehicle security and take full advantage of the space between vehicle and lane as much as possible. Based on the analysis of integrity application differences from civil aviation to autonomous vehicles, an improved alert limit determination method is proposed in this paper. The kinematic model is firstly introduced into the online determination of alert limit. The integrity risk on two sides are allocated optimally respect to the road geometry and kinematic model. The fixed cuboid bounding box is replaced by a subversive fan-shaped bounding box which is more reasonable to cover the safety-critical areas. The discussion compared with the Ford model also verified the superiority of the proposed method. Finally the paper also gives the alert limits calculated based on the Chinese standards and hopefully it could provide some references for the navigation integrity assessment for autonomous vehicles.

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Section: Integrity Application From Civil Aviation To Autonomous Vehimentioning

confidence: 99%

Integrity for autonomous vehicles and towards a novel alert limit determination method

Meng

Hsu

2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…It was first introduced in GPS P(Y) code acquisition and has been well tested in acquisition of GPS and Galileo system [24]. 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].…”

Section: Introductionmentioning

confidence: 99%

“…It makes the acquisition of BeiDou B1/B3 signals more difficult than that of other GNSS signals. Overcoming the effect of bit sign transition has become a critical issue in BeiDou signal acquisition [9][10][11][12][13][14][15]. A previous study has evaluated eight classical acquisition methods [16].…”

Section: Introductionmentioning

confidence: 99%

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

Yang

Wang

et al. 2020

Sensors

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The secondary modulation with the Neumann-Hoffman code increases the possibility of bit sign transition. Unlike other GNSS signals, there is no pilot component for synchronization in BeiDou B1/B3 signals, which increases the complexity in acquisition. A previous study has shown that the delay and multiplication (DAM) method is able to eliminate the bit sign transition problem, but it only applies to pretty strong signals. In this paper, a DAM-based BeiDou signal acquisition approach, called variable length data accumulation (VLDA), is proposed to acquire weak satellite signals. Firstly, the performance of DAM method versus the different delays is analyzed. The DAM operation not only eliminates bit sign transition, but it also increases noise power. Secondly, long-term signal is periodically accumulated to improve signal intensity in order to acquire weak signals. While considering the Doppler frequency shift of ranging codes, the signal length must be compensated before accumulating long-term signal. Finally, the fast-Fourier-transform based parallel code phase algorithm are used for acquisition. The simulation results indicate that the proposed VLDA method has better acquisition sensitivity than traditional non-coherent integration method under the same calculation amount. The VLDA method only requires approximately 27.5% of calculations to achieve the same acquisition sensitivity (35 dBHz). What is more, the actual experimental results verify the feasibility of the VLDA method. It can be concluded that the proposed approach is an effective and feasible method for solving the bit sign transition problem.

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Online Integrity Alert Limit Determination Method for Autonomous Vehicle Navigation

Meng

Hsu

Feng³

2020

Lecture Notes in Electrical Engineering

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Integrity is the critical performance indicator for navigation in safetycritical applications such as autonomous vehicles. Alert limit is one of the representive parameter in integrity which defines the maximum tolerable positioning error for an operation to safely proceed. However the integrity requirements for GNSS assessment are quite different from those for autonomous vehicles. For autonomous vehicles, a reasonable alert limit needs to ensure the vehicle security and take full advantage of the space between vehicle and lane as much as possible. Based on the analysis of differences from civil aviation to autonomous vehicles, an improved alert limit determination method is proposed in this paper. The kinematic model is firstly introduced into the online determination of alert limit. The integrity risk on two sides are allocated optimally respect to the road geometry and kinematic model. The fixed cuboid bounding box is replaced by a subversive fan-shaped bounding box which is more reasonable to cover the safe-critical areas. The experiment test results compared with those of the Ford model also verified the superiority of the proposed method. Finally the paper also gives the alert limits calculated based on the Chinese standards and hopefully it could provide some references.

show abstract

Efficient BeiDou DBZP‐based weak signal acquisition scheme for software‐defined receiver

Cited by 5 publications

References 22 publications

Integrity for autonomous vehicles and towards a novel alert limit determination method

Integrity for autonomous vehicles and towards a novel alert limit determination method

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

Online Integrity Alert Limit Determination Method for Autonomous Vehicle Navigation

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