TOA and TDTOA-based augmented state pulsar integrated navigation error suppression method

Abstract

Pulsar navigation is a promising deep space autonomous navigation technology, which usually uses the time of arrival (time of arrival, TOA) as the measurement information. However, system errors such as pulsar ephemeris errors and space-borne atomic clock errors have a significant impact on navigation performance. To solve the above problems, an error suppression method for augmented state pulsar integrated navigation based on TOA and time difference TOA (TDTOA) is proposed. By adding the ephemeris error and clock error of each pulsar to the state vector, the TOA and TDTOA measurements are used to estimate and correct them. Simulation results show that this method improves the observability of the pulsar ephemeris and clock errors, eliminates the effect of these systematic errors, and improves navigation accuracy by 29% compared to traditional pulsar navigation.