scholarly journals Calibration of a three-band microwave radiometric system by an external noise signal source

2021 ◽  
Vol 1991 (1) ◽  
pp. 012027
Author(s):  
E V Fedoseeva ◽  
I N Rostokin ◽  
E A Rostokina ◽  
G G Shchukin
Keyword(s):  
External Noise ◽  
Noise Signal ◽  
Signal Source ◽  
Radiometric System

scholarly journals Issues of technical implementation of ground-based microwave radiometric system calibration

2021 ◽  
Vol 2140 (1) ◽  
pp. 012029
Author(s):  
I N Rostokin ◽  
E V Fedoseeva ◽  
E A Rostokina ◽  
G G Shchukin
Keyword(s):  
Horn Antenna ◽  
External Source ◽  
Noise Signal ◽  
Noise Generator ◽  
Signal Source ◽  
Antenna Aperture ◽  
System Calibration ◽  
Calibration Signal ◽  
Radiometric System ◽  
The Common

Abstract The theoretical bases of a method of carrying out calibration of microwave radiometric system on a noise signal of the external noise generator are analysed, the parameters setting value of gain of antenna temperature at introduction in structure of system of such external source of a calibration signal are determined. The questions of technical realization of an external source of a calibration signal for microwave radiometric system are considered, the structural scheme is presented, the place of its arrangement in structure of the antenna is determined. The necessity of using a horn antenna to create directional radiation towards the mirror antenna emitter is shown. The data on the design of such a calibration signal source for the case of its use in a three-band microwave radiometric system with the reception of a noise signal at the common antenna aperture and a sequential separation of the input signals of the three bands in the feeder path of the common mirror irradiator are presented. The influence of the design and, accordingly, the directional properties of the horn antenna of a microwave radiometric system calibration signal source on the coefficient characterizing the radiation divergence created by the noise generator horn, as well as the frequency properties of this coefficient are analysed. The results of measurements of radio-thermal radiation by a three-band microwave radiometric system when two calibration periods with reception of a radio-noise signal from an external calibration signal source located at the base of the antenna mirror are presented.

Phase Selective Oscillations in Two Noise Driven Synaptically Coupled Spiking Neurons

2015 ◽  
Vol 25 (07) ◽  
pp. 1540005
Author(s):  
Ilya Prokin ◽  
Ivan Tyukin ◽  
Victor Kazantsev
Keyword(s):  
Numerical Simulations ◽  
Coupled System ◽  
External Noise ◽  
Noise Signal ◽  
Feedback Mechanism ◽  
Spike Timing ◽  
Spiking Neurons ◽  
Time Lags ◽  
Tuning Parameters ◽  
Synaptic Inputs

The work investigates the influence of spike-timing dependent plasticity (STDP) mechanisms on the dynamics of two synaptically coupled neurons driven by additive external noise. In this setting, the noise signal models synaptic inputs that the pair receives from other neurons in a larger network. We show that in the absence of STDP feedbacks the pair of neurons exhibit oscillations and intermittent synchronization. When the synapse connecting the neurons is supplied with a phase selective feedback mechanism simulating STDP, induced dynamics of spikes in the coupled system resembles a phase locked mode with time lags between spikes oscillating about a specific value. This value, as we show by extensive numerical simulations, can be set arbitrary within a broad interval by tuning parameters of the STDP feedback.

Design of Precise DC Millivolt Signal Source Based on System-on-Chip of C8051F410

2011 ◽  
Vol 382 ◽  
pp. 183-186 ◽  
Author(s):  
Ying Wang ◽  
Xue Zhong Ai ◽  
Qi Liu ◽  
Ren Yu Liu
Keyword(s):  
Noise Signal ◽  
Low Noise ◽  
System On Chip ◽  
Signal Source ◽  
Current Output ◽  
Type D ◽  
Power Supply Circuit ◽  
On Chip ◽  
Low Drift ◽  
Analog Output

This paper describes design process of thermocouple signal precise source. System-on-chip of C8051F410 is a key to signal source. It can realize 15 bit analog output through internal two-path 12 bit current output type D/A .Signal amplification circuit includes power supply circuit, low drift, low noise signal that can be verification source of thermocouple measuring instrument.

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