primaryRadar

Given a predicate that represents a relationship or action between entities, generate a one-sentence description explaining its meaning.  
# Instructions
Focus on describing the relationship, not the entities themselves. 
# Response Format
Begin the description with \' Indicates...\'

Predicate: primaryRadar

Indicates that the relationship or action is detected or established using primary radar sensing (i.e., direct reflection of radio waves from a target without requiring a transponder).