Target passive ranging without an ownship maneuver

A method for estimating a set of parameters of an object with respect to a reference, comprising:

• assigning one of a corresponding respective plurality of predetermined potential values for each member of the set to a corresponding plurality of models representative of the object, each model having a respective model probability;
• updating the assigned one of potential values for each member of the set for each corresponding model and the corresponding model probability in response to a measured value of a second predetermined parameter of the object to form a corresponding plurality of updated models, having respective updated first parameter and model probability;
• selecting one of the updated models in response to a corresponding updated model probability;
• and
• choosing updated values of the set for the selected updated model as an estimate of the set of parameters of the object.

A method for estimating a value of a first predetermined number of first parameters of an object with respect to a reference, comprising:

• assigning a potential value for each first parameter to a second predetermined number of models representative of the object, the models Including the first parameters and each model having a respective model probability;
• updating the assigned potential value for the first parameter and the corresponding model probability In response to measured values of a third predetermined number of second parameters of the object to form updated models, having respective updated first parameter and model probability;
• selecting one of the updated models in response to a corresponding updated model probability;
• and
• choosing the updated values of the first parameters of the selected updated model as an estimate of the corresponding values of the first parameters of the object with respect to the reference.