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Vol. 20, Special Issue, April 2013, pp.37-45

 

 

An Improved Phase-Coherent Algorithm for High Dynamic Doppler Simulation in Navigation Simulator

 

Qi Wei, Guo Junhai, Liu Guangjun, Luo Haiying, Wang Jing

Beijing Institute of Tracking and Telecommunications Technology, Beijing 100094, China

Tel.: +86-10-66360553

E-mail: robyche@163.com

 

 

Received: 1 February 2013   /Accepted: 17 April 2013   /Published: 30 April 2013

Digital Sensors and Sensor Sysstems

 

Abstract: Research targeting high dynamic Doppler frequency shift (DFS) algorithms in navigation signal simulator has important practical value. An improved Doppler simulation algorithm based on phase-coherent strategy suitable is proposed. Based on Software Radio architecture and the real-time resolving carrier high dynamic moving model, the DFS can be mapped to the phase difference between satellite signal pseudo code and carrier. The dynamic signal modulation can be implemented with the configurable numerically controlled oscillator (NCO). The quantization error and sampling error during simulation can also be eliminated by the synchronization checking algorithm of NCO frequency control word. This work guarantees the signal simulator can run constantly for a long time stably and also has the advantages of high precision and low-complexity. The simulation results from the simulator are compared with synchronous positioning results from the receiver, which demonstrate that not only the output signals of the simulator can accurately reflect the dynamic changes of the carrier, but also the high dynamic simulated signals are consistent with the rules of the real satellite signalís Doppler characteristics.

 

Keywords: Satellite navigation, Signal simulator, DFS simulation, High dynamics, Phase-coherent, Configurable NCO

 

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