Retroreflectors

With a satellite highlighted in the Object Browser, click the button or select Retroreflector from the Object Catalog to attach a retroreflector to the satellite. You can specify the following properties for Retroreflector:

Retroreflector Properties
Property Description
RetroreflectorID Enter an integer identifying the ID of the retroreflector. When the measurements tag the retroreflector it used, then this ID should match the retroreflector tracking ID. ODTK checks to assure that each retroreflector within a single parent object has a unique ID.
EstimateDelay When you set this to true, the Filter will estimate the correction to the constant retroreflector delay when processing two-way ranging measurements. Setting this to true also tells the Simulator to vary the retroreflector delay.
DelayData

Select TimeUnits or DistanceUnits and then set the BiasModel. The choices for the BiasModel are:

  • GaussMarkov: ODTK models the delay as a scalar exponential Gauss Markov sequence.
  • RandomWalk: ODTK models the delay using a Wiener (Brownian motion) sequence.
  • Vasicek: ODTK models the delay using a Vasicek stochastic sequence. This is a two-parameter model that solves for both a short-term and long-term bias.

    • Reference the Stochastic Model section for the description and inputs associated with each model.
PhaseCenterLocation Enter the offset of the retroreflector phase center from the satellite's center of mass in the satellite's body frame. Specify the X, Y, and Z coordinates in the selected distance unit.