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타이틀	High-Data-Rate Quadrax Cable Microwave Characterization at the NASA Glenn Structural Dynamics Laboratory
저자	Theofylaktos, Onoufrios;; Warner, Joseph D.;; Sheehe, Charles J.
Keyword	ACOUSTIC SCATTERING;; BIT ERROR RATE;; COAXIAL CABLES;; DEGRADATION;; DYNAMIC RESPONSE;; DYNAMIC STRUCTURAL ANALYSIS;; ELECTROMAGNETIC NOISE;; FREQUENCY RANGES;; MICROWAVES;; NETWORK ANALYSIS;; NOISE MEASUREMENT;; PERFORMANCE TESTS;; SERVICE MODULES;; STANDARD DEVIATION;; VIBRATION
URL	http://hdl.handle.net/2060/20120015564
보고서번호	NASA/TM-2012-217609
발행년도	2012
출처	NTRS (NASA Technical Report Server)
ABSTRACT	An experiment was performed to determine the degradation in the bit-error-rate (BER) in the high-data-rate cables chosen for the Orion Service Module due to extreme launch conditions of vibrations with a magnitude of 60g. The cable type chosen for the Orion Service Module was no. 8 quadrax cable. The increase in electrical noise induced on these no. 8 quadrax cables was measured at the NASA Glenn vibration facility in the Structural Dynamics Laboratory. The intensity of the vibrations was set at 32g, which was the maximum available level at the facility. The cable lengths used during measurements were 1, 4, and 8 m. The noise measurements were done in an analog fashion using a performance network analyzer (PNA) by recording the standard deviation of the transmission scattering parameter S(sub 21) over the frequency range of 100 to 900 MHz. The standard deviation of S(sub 210 was measured before, during, and after the vibration of the cables at the vibration facility. We observed an increase in noise by a factor of 2 to 6. From these measurements we estimated the increase expected in the BER for a cable length of 25 m and concluded that these findings are large enough that the noise increase due to vibration must be taken in to account for the design of the communication system for a BER of 10(exp -8).