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- W2092981966 abstract "The Solar Pointing Aerobee Rocket Control System (SPARCS) has been developed to satisfy the demand from solar experimenters for a lightweight system to point payloads precisely at the sun. A unique feature of SPARCS is that it uses no gyros, during despin and acquisition, as well as during fine pointing. Both attitude and rate are derived from the direction cosine outputs of sun sensors and magnetometers by a simple arrangement of solid-state circuits. Both flight and laboratory results for SPARCS are presented to demonstrate that pointing stability, the jitter amplitude, approaching 0.1 arc-sec with good disturbance response can be achieved. The flight results, from a continuing, successful flight program, show that +/-1 arc-sec pointing stability has been achieved by SPARCS I. The laboratory results, from hardware investigations conducted to obtain sub-arc-second pointing for SPARCS II, an improved system, show that stability better than +/-0.1 arc-sec has been achieved. Pneumatic systems which use conventional Pulse Width Pulse Frequency (PWPF) valve drive electronics and Fixed Pressure Regulators (FPR) are compared with new systems investigated which include the use of Differential Pulse Width (DPW) valve drive electronics, a Variable Pressure Regulator (VPR) with adaptive control system electronics, and a Fluidic Proportional Thruster (FPT). The new systems investigated are not primarily limited by the pneumatics, as is the PWPF system; they are primarily limited by the noise in the control electronics, which is about 0.1 arc-sec for SPARCS II." @default.
- W2092981966 created "2016-06-24" @default.
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- W2092981966 date "1970-09-01" @default.
- W2092981966 modified "2023-09-24" @default.
- W2092981966 title "A gyroless sounding rocket control system with sub-arc-second pointing stability" @default.
- W2092981966 cites W1968981477 @default.
- W2092981966 doi "https://doi.org/10.1016/0005-1098(70)90041-5" @default.
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