Spacecraft ordnance system and method for self-test

Details Spacecraft ordnance system and method for self-test Spacecraft ordnance system and method for self-test

2006-06-06

2006-06-06

Johnson, Stephen M. (Department: 3641)

Ammunition and explosives

Igniting devices and systems

Ignition or detonation circuit

C102S217000, C102S218000

Reexamination Certificate

active

07055435

ABSTRACT:
An improved spacecraft ordnance system includes a plurality of squibs each connected with a resistor having a squib unique resistance value and a driver unit including built-in test circuitry. Ordnance harness cables connect the squibs with the driver unit. The resistors enable squib identification. The built-in test circuitry enables unambiguous verification of correct connection of each squib with the driver unit. The built-in test circuitry includes a low-impedance multiplexer for selecting a driver line for monitoring, a precision current source for providing a relatively low current to a selected output of the driver unit producing a voltage proportional to the total resistance from signal to ground, and a analog/digital converter for digitizing the voltage and reporting the result to a computer for comparison to predicted values using a telemetry interface and therefore identifying the selected squib. An EMI-tight adapter housing the squib-specific resistor may be attached to the squib.

REFERENCES:
patent: 4068556 (1978-01-01), Foley
patent: 6300764 (2001-10-01), Kelley
patent: 6386108 (2002-05-01), Brooks et al.
patent: 2 571 843 (1986-04-01), None

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