Global navigation satellite system (GNSS) ambiguity resolution is the process of resolving the unknown cycle ambiguities of the carrier phase data as integers. The sole purpose of ambiguity resolution is to use the integer ambiguity constraints as a means of improving significantly on the precision of the remaining GNSS model parameters. In this contribution, we consider the problem of ambiguity resolution for GNSS attitude determination. We analyse the performance of a new ambiguity resolution method for GNSS attitude determination. As it will be shown, this method provides a numerically efficient, highly reliable and robust solution of the nonlinearly constrained integer least-squares GNSS compass estimators. The analyses have been done by means of a unique set of extensive experimental tests, using simulated as well as actual GNSS data and using receivers of different manufacturers and type as well as different platforms. The executed field tests cover two static land experiments, one in the Netherlands and one in Australia, and two dynamic experiments, a low-dynamics vessel experiment and high-dynamics aircraft experiment. In our analyses, we focus on stand-alone, unaided, single-frequency, singleepoch attitude determination, as this is the most challenging case of GNSS compass processing.
In this contribution we will provide an overview of the work that has been done on pulsar navigation and show a new direction in pulsar‐based navigation research. Up until now the focus has been on X‐ray pulsars, whereas our focus will be on the possibility of using radio pulsars. The radio frequency range has been neglected because the radio‐frequency pulses were assumed to be too weak to detect with antennas of a reasonable size. We will demonstrate that with a relatively small antenna radio pulses can be detected even on Earth. In our discussion we will make a comparison of pulsar navigation with GNSS and the differences are analyzed in a detailed discussion on both navigation methods.
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