Radio astronomy receivers

Tiuri, M.

doi:10.1109/tap.1964.1138345

Cited by 158 publications

(65 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The terminology for correlation detection is unfortunately muddled. Communications engineers use the term correlation receiver to describe what radio astronomers usually think of as a spatial interferometer or a synchronous detector, while single-dish astronomical instruments take the name "correlation receiver" [10,11] or the more apt "continuous comparison receiver" [4,9]. More recently, the same r , where the angle brackets denote an average over a time long compared with the reciprocal of the input bandwidth.…”

Section: Correlation Detectionmentioning

confidence: 99%

“…[2,3,4,5,6]). A number of authors have described specific architectures and examined the operation and sensitivity of correlation radiometers in absolute terms and their suppression of effects from the 1/f noise common to amplifiers [4,7,8,9,10,11,12,13,14]. In the following, Section II contains a general discussion of correlation and Section III gives an analysis of the choice of hybrid phase, information that is not readily available elsewhere.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Spectroscopy with multichannel correlation radiometers

Harris

2005

Review of Scientific Instruments

View full text Add to dashboard Cite

*Correlation radiometers make true differential measurements in power with high accuracy and small systematic errors. This receiver architecture has been used in radio astronomy for measurements of continuum radiation for over 50 years; this article examines spectroscopy over broad bandwidths using correlation techniques. After general discussions of correlation and the choice of hybrid phase experimental results from tests with a simple laboratory multi-channel correlation radiometer are shown. Analysis of the effect of the input hybrid's phase shows that a 90• hybrid is likely to be the best general choice for radio astronomy, depending on its amplitude match and phase flatness with frequency. The laboratory results verify that the combination of the correlation architecture and an analog lag correlator is an excellent method for spectroscopy over very wide bandwidths.

show abstract

Section: Correlation Detectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spectroscopy with multichannel correlation radiometers

Harris

2005

Review of Scientific Instruments

View full text Add to dashboard Cite

show abstract

“…[5][6][7] On the other hand, other types of microwave broadband receivers used in radio astronomy, as well as in other radio physics applications, usually have square-law detectors at their outputs, which make nonlinear transforms with the aim of obtaining an output DC value proportional to the variance of input noise-like signal. 8,9 These receivers are very sensitive radiometers, where the received microwave fluctuation electromagnetic radiation is detected with a Schottky diode working as square-law device. [10][11][12][13] In order to improve their sensitivity, these receivers are partially or fully cooled to cryogenic temperatures, and when a great level of integration in the system is required, such as in arrays of receivers, the diode detectors can be also working under cryogenic conditions.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of a lossy transmission lines based diode detector at cryogenic temperature

Villa

Aja

Fuente

et al. 2016

Review of Scientific Instruments

View full text Add to dashboard Cite

Articles you may be interested inThis work is focused on the design, fabrication, and performance analysis of a square-law Schottky diode detector based on lossy transmission lines working under cryogenic temperature (15 K). The design analysis of a microwave detector, based on a planar gallium-arsenide low effective Schottky barrier height diode, is reported, which is aimed for achieving large input return loss as well as flat sensitivity versus frequency. The designed circuit demonstrates good sensitivity, as well as a good return loss in a wide bandwidth at Ka-band, at both room (300 K) and cryogenic (15 K) temperatures. A good sensitivity of 1000 mV/mW and input return loss better than 12 dB have been achieved when it works as a zero-bias Schottky diode detector at room temperature, increasing the sensitivity up to a minimum of 2200 mV/mW, with the need of a DC bias current, at cryogenic temperature. C 2016 AIP Publishing LLC.[http://dx

show abstract

“…is usually governed by gain fluctuations ( ΔG G ) [2], where ' A T is the antenna temperature (including the ohmic losses from the antenna to the receiver's input), T R is the receiver's noise temperature,     is the integration time, defined as half the inverse of the integrator's filter bandwidth. In the ideal case, ΔG G 0  and the commonly used equation is obtained.…”

mentioning

confidence: 99%

Microwave Radiometer Resolution Optimization Using Variable Observation Times

Camps

Tarongi

2010

Remote Sensing

View full text Add to dashboard Cite

This manuscript first revises the performance of total power, Dicke-type and noise-injection microwave radiometers. Equations for the radiometric resolution are revised or derived, and their performance in terms of the radiometric resolution improvement with respect to the ideal total power radiometer resolution is evaluated. It is then shown that the radiometric resolution of noise-injection radiometers can be optimized by adjusting dynamically the integration times devoted to the three measurements: antenna, antenna plus noise, and reference load. Numerical results are then presented to illustrate the dependence of the radiometric resolution with different instrument parameters. Experimental results are finally presented to corroborate the predicted performance. It is also shown that in many cases of interest these integration times can be set to a constant value with little degradation with respect to the optimum case, but better than the case in which the total integration time is divided in three equal subintervals.

show abstract

Radio astronomy receivers

Cited by 158 publications

References 8 publications

Spectroscopy with multichannel correlation radiometers

Spectroscopy with multichannel correlation radiometers

Performance evaluation of a lossy transmission lines based diode detector at cryogenic temperature

Microwave Radiometer Resolution Optimization Using Variable Observation Times

Contact Info

Product

Resources

About