KEYWORDS: 3D modeling, Data modeling, Control systems, Power grids, Modeling, Instrument modeling, Solar energy, Batteries, Lightning, Data transmission
Under the overall goal of "double carbon", the new power system is an important part of realizing "peak carbon dioxide emissions and carbon neutrality". The double-height characteristics of the new power system lead to many risks in the operation and control of the power system compared with the traditional methods. It is an inevitable trend for the new power system to realize the transformation of power transmission and transformation projects into digitalization and intelligence under complex operating conditions and multi-source control. Through the three-dimensional digitalization technology with high precision, high fidelity and multi-dimensional data fusion, the basic requirements of the new power system for equipment operation and maintenance can be more effectively realized. This paper introduces the basic characteristics of the operation and control of the new power system and the general situation of the application of 3D digitalization of power transmission and transformation, and puts forward two prospects for the 3D digitalization technology under the background of the new power system. Finally, it illustrates the 3D digitalization application of power transmission and transformation engineering by taking the research on 3D cable laying modeling of substation with high fidelity and multidimensional data fusion as an example.
KEYWORDS: Satellites, Calibration, Doppler effect, Modulation, Oscillators, Backscatter, Received signal strength, Attenuators, Modulators, Detection theory
A scheme of Integrative Return Signal Simulator (IRSS) of satellite altimeter and scatterometer is designed. The IRSS realized by the scheme can compensate the insufficiency of general measure and calibration equipment. It can calibrate easily the transfer function of satellite altimeter and scatterometer and test the property of software and hardware in laboratory and launching site. The IRSS is based on the principle of the pulse regeneration and the return signal is synthesized at digital method. The scheme can realize modulation of pulse width and Doppler frequency shift for return signal. The problems such as accurate delay of radio-frequency and the phase difference shift and so on can be resolved. The simulation results show that the synthesized return signal not only may satisfy fully the statistical law of actual return signal but also can include information concerned for testing the property of altimeter and scatterometer. The method lays a reference for developing other type of Return Signal Simulator (RSS) in future.
KEYWORDS: Synthetic aperture radar, Received signal strength, Device simulation, Calibration, Computer simulations, Signal detection, Antennas, Signal processing, Electromagnetic simulation, Digital signal processing
Ground-based test and calibration of Synthetic Aperture Radar (SAR) is a very complex program. It needs a practical method and technique to provide a full return signal simulation over the range of in-orbit operating conditions before launch for such a program. Compared with conventional ground-based test methods, the Return Signal Simulator (RSS) is more effective for full system validation and makes test program and procedure greatly simplified. Based upon signal processing of SAR, an advanced RSS system is designed. By using chirp regeneration method, the RSS can achieve 1-10ms time delay between SAR transmitting and simulated signal return, which will realize round trip path delay simulation for various orbit height; By using digital synthesizing method, various target return signal can be simulated. So the RSS system can make prelaunch performance of SAR well known, and this will be very helpful for radiometric calibration after launch. This paper will give detailed description on the RSS system design with its means of testing and calibrating of satellite SAR.
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