name: ICD
full_form: Interface Control Document
context: the following steps: 1) Computation of satellite locations at time of transmission using the ephemeris parameters and user algorithms defined in the relevant ICD of the particular GNSS. The satellite locations are transformed into WGS-84 reference frame, if needed. 2) Computation of clock correction parameters using the parameters and algorithms as defined in the relevant ICD of the particular GNSS. 3) Computation of atmospheric delay corrections using the parameters and algorithms defined in the relevant ICD of the particular GNSS for the ionospheric delay, and using the Gupta model in reference [8] p. 121 equation (2) for the tropospheric delay. For GNSSs which do not natively provide ionospheric correction models (e.g., GLONASS), the ionospheric delay is determined using the available ionospheric model adapted to the particular GNSS frequency. 4) The WLS position solution starts with an initial estimate of the user state (position and clock offset). The Reference Location is used
description: A document that outlines the standards and protocols for a specific interface. In this case, the Interface Control Document (ICD) defines the parameters and algorithms for satellite navigation systems.
explanation: The text refers to an 'Interface Control Document' (ICD) which provides information about computing satellite locations, clock correction parameters, and atmospheric delay corrections. This suggests that the ICD acts as a set of defined rules and procedures for how different components of a satellite navigation system interact, aligning with the definition of a Specification.
section_title: F.3WLS position solution
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