Simulation and interactive approach based demonstration of pulse compression technique in atmospheric radar

Abstract

Pulse compression technique plays a vital role in many communication systems e.g. optical, radio frequency (RF)/microwave, and biomedical applications. This article deals with demonstration of the technique in the atmospheric radar employed for wind profiling under various weather conditions. Relevant computation, simulations and analysis involved in practical application or implementation of this technique, that are achieved using the widely accepted complementary codes are presented. Moreover, making use of the computational and visualization features of MATLAB and LabVIEW packages, a flexible front-end graphic-user-interface (GUI) is designed and developed to demonstrate the functionality of this technique in the atmospheric radar operating at 206.5 MHz in the central Himalayan region. The GUI introduces the features of displaying coded or uncoded transmission and reception based on various user defined parameters such as pulse width (PW), pulse repetition frequency (PRF), Doppler frequency, and the number of data points. An interlock arrangement for inter-pulse period (IPP)-duty ratio is added to restrict the radar pulsed operation with the maximum duty ratio up to 15%. An arrangement is also made to visualize the auto and cross-correlations performed on the code sequences and RF signals. The user-friendly and easily customized GUI will benefit the larger user community in saving their time in writing their programs and/or constructing any hardware assemblies to test the performance of pulse compression technique during early design phases.

Light-Scattering Properties for Aggregates of Atmospheric Ice Crystals within the Physical Optics Approximation

“…A substantial amount of work has been done to study the properties of clouds. At the same time, many features of the light-scattering problem for ice particles are still poorly studied [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Light Scattering Properties for Aggregates of Atmospheric Ice Crystals Within the Physical Optics Approximation

“…These properties are actively studied within international projects and different methods are used: in-situ aircraft measurements, remote sensing from ground and space, etc. A huge amount of work has been done to study the properties of clouds, at the same time, many features of the light scattering problem for ice particles are still poorly studied [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Spatial and Temporal Variation of Aerosol Optical Depth in Huaihai Economic Zone from 1982 to 2021

“…With the continuous optimization and updating of satellite sensors and inversion algorithms, AOD measurements taken by remote sensors have become more and more accurate, and the calculation of AOD from satellite remote sensing data has become the main technique for the large-scale monitoring of aerosol loads [24]. There are many sensors that can monitor AOD, such as the Moderate Resolution Imaging Spectroradiometer (MODIS) [23], the Visible Infrared Imaging Radiometer (VIIRS) [25], the Advanced Very High Resolution Radiometer (AVHRR) [26], the Ozone Monitoring Instrument (OMI) [27], the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) [28], the Polarization and Anisotropy of Reflectances for Atmospheric Sciences coupled with Observations from a Lidar (PARASOL) [29], etc. Among them, the AVHRR, which is carried on the NOAA series of satellites, has been continuously conducting Earth observation missions since 1979, so it has an accumulation of data for more than 40 years and a great potential for applications.…”