Abstract
The Indian Regional Navigation Satellite System (IRNSS) has recently (May 2016) become fully-operational and has been provided with the operational name of NavIC (Navigation with Indian Constellation). It has been developed by the Indian Space Research Organization (ISRO) with the objective of offering positioning, navigation and timing (PNT) to the users in its service area. This contribution provides for the first time an assessment of the IRNSS L5-signal capability to achieve instantaneous attitude determination on the basis of data collected in Perth, Australia. Our evaluations are conducted for both a linear array of two antennas and a planar array of three antennas. A pre-requisite for precise and fast IRNSS attitude determination is the successful resolution of the double-differenced (DD) integer carrier-phase ambiguities. In this contribution, we will compare the performances of different such methods, amongst which the unconstrained and the multivariate-constrained LAMBDA method for both linear and planar arrays. It is demonstrated that the instantaneous ambiguity success rates increase from 15% to 90% for the linear array and from 5% to close to 100% for the planar array, thus showing that standalone IRNSS can realize 24-h almost instantaneous precise attitude determination with heading and elevation standard deviations of 0.05° and 0.10°, respectively.
Highlights
Developed by the Indian Space Research Organization (ISRO), the Indian Regional NavigationSatellite System (IRNSS) has recently (May 2016) become fully-operational and provided with the operational name of NavIC (Navigation with Indian Constellation)
We provided an initial assessment of the fully-operational Indian Regional Navigation Satellite System (IRNSS) L5-signal capability to achieve the instantaneous attitude determination
Our evaluations of IRNSS attitude determination performance were conducted for both a linear array of two antennas and a planar array of three antennas located at Curtin University, Perth, Australia
Summary
Developed by the Indian Space Research Organization (ISRO), the Indian Regional Navigation. The observations of I1 and I2 were used by [9] to investigate the quality of the IRNSS navigation messages In this contribution, for the first time, an analysis of the fully-operational IRNSS L5-signal capability to achieve instantaneous attitude determination is carried out. For the first time, an analysis of the fully-operational IRNSS L5-signal capability to achieve instantaneous attitude determination is carried out Such an analysis based on only two IRNSS satellites, i.e., I1 and I2, was conducted by [10]. The performance of the IRNSS L5 observables for the instantaneous attitude determination is presented for both the linear and planar array It is shown what improvements are achieved when using MC-LAMBDA instead of standard LAMBDA method.
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