Ground antennas in NASA's deep space telecommunications

Rafferty, W.; Slobin, S. D.; Stelzried, C. T.; Sue, M. K.

doi:10.1109/5.284731

Cited by 7 publications

(4 citation statements)

References 7 publications

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“…As N increases from one to a large number, the excess noise temperature given by Equation (2) increases to a maximum, and then goes to zero as N continues to become very large. This is not obvious from a cursory examina tion of Equation …”

Section: Excess Noise Temperature and Added-gain Lossmentioning

confidence: 94%

“…Additionally, in the receive mode the antenna systems arc designed to have vety low system noise temperatures. Increasing the gain and lowering the system noise temperatures translate into maximizing the ground-received signal-to-noise ratio [2]. Over the years, a great deal of attention has been paid to low ering system noise temperatures, through the use of low-loss front end microwave waveguide components, ami cryog enically cooled low-noise amplifiers (masers and high-electron-mobility transis tors).…”

Section: Background On Dsn Antennasmentioning

confidence: 99%

“…If one is interested in the excess-noise-temperature (ENT) contribution due to paint or primer or both, the following equation applies for the where N is the number of reflectors: (2) where rl and r 2 are the input-voltage reflection coefficients as seen looking at the nnpainted (bare-metal) and painted reflector surfaces, respectively. There are no restrictions in Equation (2) regarding the value of N. It is required only that the values of I rl i and I r 2 1 be less than or equal to unity, and greater than or equal to zero.…”

Section: Excess Noise Temperature and Added-gain Lossmentioning

confidence: 99%

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Noise temperature and gain loss due to paints and primers: a case study of DSN antennas

Otoshi

Rahmat-Samil²,

Cirillo

et al. 2001

IEEE Antennas Propag. Mag.

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In achieving high performance for reflector antennas, it has been noted that it is essential to carefully assess the roles of sur face paints and primers. A thorough literature search has revealed that not much has been reported on this very important engineering-implementation topic. It is one of the main objectives of this feature article to provide a detailed study on the effects of paints and primers on reflector-antenna performance. In particular, as a case study, this paper presents excess noise-temperature and added-gain loss data at 32 GHz for various combinations of paints and primers currently being studied for use on DSN (Deep Space Network) antenna reflector surfaces. It is shown that 500FHR6 acrylic urethane-based paint has the lowest excess-noise-temperature contribution. Recently, it has been recommended that this paint be used for all new DSN beam-waveguide antennas being constructed, and for all those 34-m and 70-m antennas with reflector surfaces that need repainting. The results, methodologies, and observations presented in this article are also applicable to other reflector antenna configurations.

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Section: Excess Noise Temperature and Added-gain Lossmentioning

confidence: 94%

Section: Background On Dsn Antennasmentioning

confidence: 99%

Section: Excess Noise Temperature and Added-gain Lossmentioning

confidence: 99%

See 1 more Smart Citation

Noise temperature and gain loss due to paints and primers: a case study of DSN antennas

Otoshi

Rahmat-Samil²,

Cirillo

et al. 2001

IEEE Antennas Propag. Mag.

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“…The G/TOp parameter is defined by 4 x A e k-z GffoP = __;. ;__ ;..._-- (1) where A e is the effective antenna area, X is the received wavelength, TOP = (T a + T e ) is the system operating noise temperature ( Ref 3,4), Ta is the antenna noise temperature with contributions from the 2.73 K cosmic background, the earth's atmosphere (Tatm) and the antenna transmission line (TI) and T e is the effective Page 2 Printed (1 1/15/93) noise temperature of the receiving system with contributions from the low noise amplifier (Tlna), and the follow-up amplifier (Tf).…”

Section: Calibrating Large Microwave Antennasmentioning

confidence: 99%

Precision DSN radiometer systems: impact on microwave calibrations

Stelzried

Klein

1994

Proc. IEEE

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The NASA Deep Space Network (DSN) has a long history of providing large parabolic dish antennas with precision surfac%s, low-loss feeds and ultra-low noise amplifiers for deep space telecommunications. To realize the benefits of high sensitivity, it is important that receiving systems are accurately calibrated and monitored to maintain peak performance. A method is described to measure system performance and to calibrate the receiving system using procedures, software and commercial instruments that are easy to implement and efficient to use, The utillity of the measurement procedures and the precision of the receiver calibration technque were demonstrated by performing tests at Ka-band (32 and 33.68 GHz) frequencies at Goldstone on a 34-m beam-waveguide antenna Observations of multiple calibration radio sources are used to measure the dependence of antenna gain and system noise temperature on source elovat"km and derive the peak value. Receiving system non-linearities are frequently overlooked as an error source in the calibration of microwave radiometers. 1 he experimental resutts described in this paper illustrate some of the ways that receiving system non-linearity can negatively impact system performance. A simple radiometer calibration technque and analysis provide quantitative information that enables the system engineer to adjust and linearize the receiving system. When that is not practical, tha experimenter or the operator can apply correction coefficients to the measured values of system noise temperature and thereby compensate for the receiving system non-linearity. The hgh performance antennas and the sensitive receiving systems of the DSN are valuablo resources for scientific research in addition to the primary telecommun'k,ation tasks that support spaoe missions. The antenna gain and system noise temperature measurements and the radiometer calibration method described in this paper are also useful to perform precision research experiments. * .

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Antenna diversity technique for future space telemetry modulation scheme

Shihabi

Tan

1995 IEEE Aerospace Applications Conference. Proceedings

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Ground antennas in NASA's deep space telecommunications

Cited by 7 publications

References 7 publications

Noise temperature and gain loss due to paints and primers: a case study of DSN antennas

Noise temperature and gain loss due to paints and primers: a case study of DSN antennas

Precision DSN radiometer systems: impact on microwave calibrations

Antenna diversity technique for future space telemetry modulation scheme

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