Abstract: The space relay reliability influences the national defence system reliability seriously, and precaution and detection of relay remainder are the pivotal factors to enhance the relay reliability. Particle impact noise detection (PIND) is the industry standard, but there is a lack of working mechanism research. From the point of view of dynamics the collision mathematic models of relay remainder based on PIND are established,the necessary conditions and stability conditions when the remainder performing one-period equiamplitude motion are studied, and lastly the corresponding simulations.

Key words: aerospace relay, reminders, PIND, stability