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A multipath model for the aeronautical channel, which was derived from a channel measurement campaign, has been implemented into hardware simulators. The way of implementation is described in detail and simulation results obtained with a GNSS receiver and showing the impact of multipath are presented.
The Factored Correlator Model (FCM) is an analytical model for the outputs of a GNSS receiver's correlators. The FCM precludes the need for simulation of the lower-level signal processing stages, significantly increasing simulation speed and considerably decreasing processing and memory requirements, while still keeping a high level of realism. Results for the FCM validation using statistical models...
This paper analyzes strengths and shortcomings of the existing aids for GNSS receiver development. A new set of tools is presented that provides to the developer debugging and optimization capabilities not supplied so far by existing tools. The proposed tools are simple and therefore very affordable, but never the less they are very functional. The first results are presented from the application...
One of the current limitations to evaluate the impact of a realistic multipath environment over a GNSS receiver is the high number of multipath rays that are needed to model the channel in a HW RF constellation simulator. That makes necessary the application of reduction techniques to decrease the number of channels per satellite to be simulated. The initial evaluation of two reduction techniques...
Taking benefit of the new Galileo ranging signals, the ENCORE (Enhanced Code Galileo Receiver) project aims to develop a low-cost Land Management Application to cover needs of the Brazilian market in terms of geo-referencing and rural/urban cadastre, using a low-cost Enhanced Galileo Code Receiver as baseline. Land management applications require precision and accuracy levels from a few to several...
With the multiplication of navigation systems (GPS, GALILEO, GLONASS, QZSS, ...) and the large variety of signals to be received, GNSS constellation simulators need to be more and more flexible. In the scope of its navigation activities, the CNES has expressed the need for a simulator that, in addition to allow the test of a large variety of receivers, satisfies a twofold objective: the emulation...
In this paper we describe the prototype concept of multi-constellation GNSS receivers investigated in the Galileo Ready Advanced Mass Marker Receiver (GRAMMAR) EU FP7 project. The purpose of our work is to provide technology solutions with their implementations for multi-system GNSS mass market receivers by motivating the need for both hardware and software research and present the functional blocks...
Traditional satellite navigation receivers usually depend on FPGA chips or ASIC chips, which lack flexibility and multiple constellation support. The paper presents a single DSP multi-constellation satellite navigation receiver hardware design method, and discusses signal sample, buffer and output technology. Furthermore, multi-constellation task scheduler is also discussed. Based on TMS320C6416,...
The research discussed in this paper addresses the question of how to simulate realistic observables from current and pending Global Navigation Satellite Systems (GNSSs) in a way that is independent of the characteristics of specific systems. The generated observables can be used to predict future multi-GNSS performance and aid in the development of enhanced processing algorithms. This paper introduces...
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