High-Quality BDS Navigation Signal Simulator Based on GPU Optimized Design

High quality factor bandpass filters based on a number of cascaded resonators of dual-resonance mechanism are proposed in the present paper. Each resonator is constructed as two overlapped coplanar waveguide (CPW) resonant structures. The cascaded resonators mediate microwave coupling between two isolated corner-shaped CPW feeders only at the resonant frequencies leading to a bandpass filter of high quality factor. The two resonant frequencies and the separation between them can be fine-tuned by the dimensions of the structure. The effects of the dimensional parameters of the resonator and the feeding CPW regions on the resonant frequencies and the performance of the bandpass filter are investigated. The effect of the loss tangent of the dielectric substrate material on the quality factors at the two resonant frequencies is studied. Three prototypes of the proposed filter are fabricated and experimentally studied for more understanding of the underlying physical principles of operation and for verifying some of the simulation results. The experimental results show good agreement when compared with the corresponding simulation results. It is shown that, at low enough absolute temperature, the proposed structure can operate as superconducting microwave resonator when made from the appropriate materials. Also, it is shown that an optimized design of the proposed bandpass filter, based on superconducting CPWR structure, can achieve quality factors high enough to form a quantum data bus for hybrid architecture of quantum information systems.

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Optimized Design and Analysis of Offshore Beidou Maritime Foundation Reinforcement System Pseudolite Ranging-Codes

Polish Maritime Research ◽

10.1515/pomr-2017-0063 ◽

2017 ◽

Vol 24 (s2) ◽

pp. 45-52

Author(s):

Deliang Su ◽

Anan Zhou ◽

Zilin Zhou ◽

Wei Chen

Keyword(s):

Navigation System ◽

Spectral Characteristics ◽

Design Parameters ◽

Optimized Design ◽

System Availability ◽

Design Scheme ◽

Performance Requirements ◽

Navigation Signal ◽

Satellite Positioning ◽

Signal Environment

Abstract Under the bad sea conditions and weak Beidou navigation signal environment, it is difficult to locate the ship on the sea, and the Beidou navigation system can’t work well. Beidou pseudolite system can improve the performance of Beidou navigation system as a navigation signal transmitter fixed on the ground, the signal of which can improve satellite positioning constellation structure, and improve the system availability reliability and precision. In order to ensure the interoperability and non-correlation of the Beidou pseudolite and the Beidou navigation system, the pseudolite ranging-codes should be selected in the same code space of the satellite ranging-codes and the residual pseudo random code generated by the 2 taps design scheme does not satisfy the performance requirements of the ranging-codes. To solve this issue, a combined design scheme with 3 taps is proposed, and 12 kinds of pseudolite ranging-codes are optimally selected according to the optimum design parameters of ranging-codes. The waveform and correlation of the selected pseudolite ranging-codes are analyzed by MATLAB, the acquisition simulation is carried out by using the new pseudolite ranging-codes. The experimental results show that the new 3-taps based ranging codes design scheme behaves a good balance, correlation and spectral characteristics.

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Research on Test Method of Satellite Navigation Signal Simulator

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/490/6/062037 ◽

2019 ◽

Vol 490 ◽

pp. 062037

Author(s):

Jie Xu ◽

Yu Sang ◽

Yunling Wang ◽

Lizhi Hu

Keyword(s):

Satellite Navigation ◽

Test Method ◽

Signal Simulator ◽

Navigation Signal

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Effects of Phase Jitter on the Navigation Signal Simulator

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.602-605.2781 ◽

2014 ◽

Vol 602-605 ◽

pp. 2781-2784

Author(s):

Jing Pang ◽

Wei Hua Mou ◽

Xiao Mei Tang ◽

Gang Ou

Keyword(s):

High Precision ◽

Implementation Process ◽

Quantization Error ◽

Digital Implementation ◽

Phase Jitter ◽

Signal Simulator ◽

Navigation Signal ◽

High Dynamic ◽

Phase Quantization ◽

Simulation Results

As the measuring equipment of the navigation receivers, high precision pseudorange signal is generated by navigation signal simulator. Pseudorange error is mainly from modeling error in high dynamic scenarios, but it is mainly from phase quantization error of digital implementation process in high precision scenarios of evaluating receiver’s pseudorange accuracy. Is this paper, according to the implementation principle of carrier and code DDS, the causes of the phase quantization error is analyzed and the pseudorange error formula is derived and the simulation results are given. Analysis and simulation results show that phase critter originated by carry phase truncation effects measurement result of zero value and cannot be ignored. The conclusion can guide the design of navigation signal simulator.

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