Abstract Most solar radio telescopes operate below ∼18 GHz and cannot realize a complete frequency coverage of the microwave spectrum, especially in optically thin regime during bursts, which can provide unique information about magnetic field burst area corona. Therefore, development high-frequency observation equipment is demanded by community. In this paper, we present spectrum system operating at 35–40 GHz. system, signal acquired an 80 cm Cassegrain circularly polarized antenna, then...

Abstract Solar flares, coronal mass ejections, and other solar radio burst phenomena release substantial amounts of radiation energy, resulting in adverse space weather conditions posing significant hazards space. Spectrum analysis conducted manually or with traditional image processing algorithms is limited by low efficiency accuracy. This paper investigates detection methods their applications. Five methods—Continuous-3 σ , Sum Flux-3 Continuous Slope, Flux Continuous-3 —are developed...

Abstract The microwave spectrum contains valuable information about solar flares. Yet, the present spectral coverage is far from complete and broad data gaps exist above 20 GHz. Here we report first flare (the X2.2 on 2022 April 20) observation of newly built Chashan Broadband Solar millimeter spectrometer (CBS) working 35 to 40 We use CBS new Moon calibrate, simultaneous NoRP at GHz cross-calibrate. impulsive stage has three local peaks with middle one being strongest maximum flux density...

The sensitivity and spectral performance of radio telescopes are increasingly affected by deteriorating electromagnetic environments. Therefore, developing a real-time interference elimination algorithm is urgent for future observations. In this paper, we developed an improved suppression filter named the least mean square (IMLMS). Unlike traditional algorithms, IMLMS uses exponential function varying with error to adjust step size. input signal normalized according its own average energy so...

Abstract Solar radio spectra and their temporal evolution provide important clues to understand the energy release electron acceleration process in corona, are commonly used diagnose critical parameters such as magnetic field strength. However, previous solar telescopes cannot high-quality data with complete frequency coverage. Aiming develop a generalized observing system, this study, we designed digital receiving system that could capture bursts broad bandwidth large dynamic range. A...

Abstract Calibrating solar radio flux has always been a concern in the community. Previously, fluxes were calibrated by matching load or new Moon for relative calibration, and at times with assistance of other stations’ data. Moreover, frequency coverage seldom exceeded 26 GHz. This paper reports upgraded Chashan Broadband Solar millimeter spectrometer (CBS) working from 35 to 40 GHz Observatory (CSO). Initially, calibration radiation brightness temperature is accomplished using as...

As the position sensor, photoelectric angle encoder affects accuracy and stability of telescope control system (TCS). A TCS-based subdivision error compensation method for is proposed. Six types sources are extracted through mathematical expressions signals first. Then period length relationships between errors deduced. And algorithm only utilizing shaft TCS put forward, along with two models; Model I that applies to speed loop II applied both loop. Combined actual project, elevation...

Solar radiation is the excitation source that affects weather in atmosphere of earth, and some solar activities such as flares coronal mass ejections are often accompanied by radio bursts. The spectrum bursts helpful for astronomers to explore mechanism With development progress observation methods, Sun can be done at almost all times day. How quickly automatically identify small proportion burst data from huge corpus has become an important research direction. innovation this study enhance...

Abstract Computation resource is the limiting factor in higher operational accuracy of field-programmable gate arrays (FPGAs) solar radio digital receivers. The data truncation strategy which determines then essential technology design a receiving system. Based on spectrometer (dual channel, 14 bit, 1.25 gigasamples per second) at Chashan Solar Radio Observatory (CSO), this paper presents can realize real-time observation (35–40 GHz) with high time and frequency resolution as well large...

Solar radio bursts can be used to study the properties of solar activities and underlying coronal conditions on basis present understanding their emission mechanisms. With construction observational instruments, around world, a vast volume data has been obtained. Manual classifications these require significant efforts human labor in addition necessary expertise field. Misclassifications are unavoidable due subjective judgments various types strong interference some events. It is therefore...

Abstract Considering that chaotic systems are highly sensitive to parameters, we design two new parameter variable by constructing perturbation items. These constructed using the state variables of Liu system perturb parameters Lorenz and Chen called Lorenz-Liu (LLCS) Chen-Liu (CLCS), respectively. In particular, items in this study not periodic but rather signals change real time. Compared with original systems, they exhibit more complex randomness dynamic behaviors. proposed cryptosystem,...

Aiming at the problems that traditional image denoising methods cannot well filter background noise of solar radio spectrum images, and training sample data is small unbalanced, it proposed to segment features through Gaussian filtering binarization. Then use morphological closed operation enhance feature; combination transformation random indexing, problem uneven distribution various samples in database solved. By designing structure convolutional neural network, classification model can...

<p indent=0mm>In a solar radio observation system, the receiver, as an essential instrument, processes signal received by antenna with amplification, filtering, digitization, and so on, yields dynamic spectrum. However, amplitude–frequency inconsistencies of devices inside receiver may lead to distortion output. In particular, increases when broadband is processed high uncertainty appear. To solve this problem, in paper we present compensation method for flatness microwave observing system....

Abstract The improvement of Analog-to-Digital Converter (ADC) performance is crucial to improve the data quality signal acquisition system. Therefore, based on dithering technology, combined with chaotic system, study designs and analyses a novel method Spurious-Free dynamic range (SFDR) ADC. First, new five-dimensional system proposed in this paper. characteristics behavior have been deeply analysed. analysis methods mainly consist Lyapunov exponent, bifurcation diagram, power spectrum...

Abstract Spectral observations with high temporal and frequency resolution are of great significance for studying the fine structures solar radio bursts. In addition, it is helpful to understand physical processes eruptions. this paper, we present design a system observe bursts resolutions at frequencies 25–110 MHz. To reduce impact analog devices improve flexibility, employ various digital signal processing methods achieve function devices, such as polarisation synthesis beamforming. The...

Electrostatic discharge experiments under simulated martian atmospheric conditions indicate that CO2 has been sequestered into carbonate by the Mars dust activities during Amazonia era.

One new approach for detection tank level is investigated based on the auto-adaptive double-threshold Canny operator, considering IR imaging of and aiming at problem level. Edge operator can set automatically, according to different gray gradient histogram's feature, instead traditional in which should be artificially, avoid loss edge information especially liquid level's because improper artificial selection. In process picking up information, it analyze number horizontal stripes, get their...

Abstract The clock signal is the heartbeat of modern electronic system, and demands increasing high‐quality has been raised, with development science technology in field information. low jitter helpful to improve signal‐to‐noise ratio (SNR) sampled data obtain high‐precision result. In this article, a programmable system generation distribution designed for high‐speed acquisition system. can provide which frequency as high 3.2 GHz. output channels are 14 each channel also be configured...

This paper presents dual-band high-gain subwavelength cavity antennas with artificial magnetic conductor (AMC) metamaterial microstructures. We developed an AMC plate that can be equivalent to mu-negative metamaterials (MNMs) at two frequencies using periodic microstructure unit cells. A antenna was constructed the as covering layer and utilizing a feed patch slot loading radiation source. The fabricated printed circuit board (PCB) process measured in anechoic chamber. |S11| of -26.8 dB...