Abstract: A constant current power supply contains a multimode transformer that supplies constant current power over a two or four wire link transporting telecommunication signals to a remote telecommunication unit. It also supplies a reduced magnitude, constant supply voltage for powering the circuitry of the constant current power supply itself. A primary transformer winding receives a pulse width-modulated voltage from a switched mode voltage generator, which is powered by a reduced magnitude, constant voltage derived from a first auxiliary, forward converter mode, secondary winding of the multimode transformer, through a first diode and a first inductor. The multimode transformer also includes a flyback mode secondary winding coupled to the two wire link and operative to deliver a prescribed constant current to the remote load circuit.

Abstract: The optical attitude reference system provides missile attitude reference ing an optical beam in lieu of conventional gyroscopes. In the missile control systems autopilot, the system uses the properties of polarized light to determine missile roll angle relative to the beam transmitter reference axes at the launch site.