This design overcomes difficulties shutting down and reigniting solid propellant motors.
[1] The pulsed rocket motor is made by pouring each segment of propellant separately.
[2] Solid rocket motors are prized in military for their long shelf lives, but at the same time some control of the burn is desired.
For example, the range of a missile can be extended by separating the burn into two pulses, one starting at launch and the other much later in its journey.
[4] The American SM-3 surface-to-air missile uses a dual-pulse motor in its third stage, one before nosecone ejection, the other after.