Abstract
In order to get rid of the dependence of the navigation and positioning system on the global navigation satellite system (GNSS), radio, television, satellite, and other signals of opportunity (SOPs) can be used to achieve receiver positioning. The space-based SOPs based on satellites offer better coverage and availability than ground-based SOPs. Based on the related research of Iridium SOPs positioning in the open environment, this paper mainly focuses on the occluded environment and studies the Iridium SOPs positioning technique in weak signal environment. A new quadratic square accumulating instantaneous Doppler estimation algorithm (QSA-IDE) is proposed after analysing the orbit and signal characteristics of the Iridium satellite. The new method can improve the ability of the Iridium weak signal Doppler estimation. The theoretical analysis and positioning results based on real signal data show that the positioning based on Iridium SOPs can be realized in a weak signal environment. The research broadens the applicable environment of the Iridium SOPs positioning, thereby improving the availability and continuity of its positioning.
Highlights
The new methods for receiver positioning based on abundant and various frequency signals have emerged in recent years
We introduce the technique of receiver positioning based on Iridium SOPs in weak signal environment in this paper
Since its point is the Iridium SOPs Doppler-shift estimation in weak signal environment, we present a new method, termed quadratic square accumulating instantaneous Doppler estimation (QSA-IDE) algorithm, to obtain Doppler-shift after analyzing the Iridium orbital and signal characteristics, and we show the principle and mathematical model of the QSA-IDE algorithm
Summary
The new methods for receiver positioning based on abundant and various frequency signals have emerged in recent years This new positioning technique is termed opportunistic navigation (OpNav) [1,2] and collaborative opportunistic navigation (COpNav) [3]. The US Defense Advanced Research Projects Agency (DARPA) presents a new program, all source positioning and navigation (ASPN), to research the correlation technique These systems treat the same signals used by mobile phones, TVs, and other radio systems as the radiation sources instead of navigation satellite signals to realize receiver positioning. It can get rid of dependence on the Global
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