Chongdi Duan
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View article: A Review of Recent Development of Geosynchronous Synthetic Aperture Radar Technique
A Review of Recent Development of Geosynchronous Synthetic Aperture Radar Technique Open
As the world’s first geosynchronous (GEO) orbit synthetic aperture radar (SAR) satellite, LuTan-4 was successfully launched on 13 August 2023. It was developed by the China Academy of Space Technology, with which the authors are affiliated…
View article: A Contrast-Enhanced Approach for Aerial Moving Target Detection Based on Distributed Satellites
A Contrast-Enhanced Approach for Aerial Moving Target Detection Based on Distributed Satellites Open
This study proposes a novel technique for detecting aerial moving targets using multiple satellite radars. The approach enhances the image contrast of fused local three-dimensional (3D) profiles. Exploiting global navigation satellite syst…
View article: Missed Detection of Entanglement in Two-Mode Squeezed States Based on the Inseparability Criterion
Missed Detection of Entanglement in Two-Mode Squeezed States Based on the Inseparability Criterion Open
The inseparability criterion provides a straightforward and efficient method for identifying and quantifying two-mode Gaussian quantum entanglement, making it a crucial tool in quantum optics experiments. However, it is crucial to recogniz…
View article: Radar Moving Target Detection Based on Small-Sample Transfer Learning and Attention Mechanism
Radar Moving Target Detection Based on Small-Sample Transfer Learning and Attention Mechanism Open
Moving target detection is one of the most important tasks of radar systems. The clutter echo received by radar is usually strong and heterogeneous when the radar works in a complex terrain environment, resulting in performance degradation…
View article: Entanglement Missed Detection of Two‐Mode Squeezed States Based on Inseparability Criterion
Entanglement Missed Detection of Two‐Mode Squeezed States Based on Inseparability Criterion Open
The inseparability criterion provides a straightforward and efficient method for identifying and quantifying two-mode Gaussian quantum entanglement, making it a crucial tool in quantum optics experiments. However, it is crucial to recogniz…
View article: Effective Sample Selection and Enhancement of Long Short-Term Dependencies in Signal Detection: HDC-Inception and Hybrid CE Loss
Effective Sample Selection and Enhancement of Long Short-Term Dependencies in Signal Detection: HDC-Inception and Hybrid CE Loss Open
Signal detection and classification tasks, especially in the realm of audio, suffer from difficulties in capturing long short-term dependencies and effectively utilizing samples. Firstly, audio signal detection and classification need to c…
View article: Research on Azimuth DBF Method of HRWS SPC MAB SAR Imaging Mode with Non-Ideal Antenna Mode
Research on Azimuth DBF Method of HRWS SPC MAB SAR Imaging Mode with Non-Ideal Antenna Mode Open
Single-phase center multiple azimuth beam (SPC MAB) mode is an effective method for high-resolution wide-swath (HRWS) SAR imaging. The traditional azimuth spectrum reconstruction method for SPC MAB mode is based on the combination scheme f…
View article: A Two-Stage Aerial Target Localization Method Using Time-Difference-of-Arrival Measurements with the Minimum Number of Radars
A Two-Stage Aerial Target Localization Method Using Time-Difference-of-Arrival Measurements with the Minimum Number of Radars Open
Distributed radar systems promise to significantly enhance target localization by virtue of the superiority of multi-view observations from widely separated radars, compared to their monostatic counterparts. Nevertheless, when the radar nu…
View article: A discrete side-lobe clutter recognition method based on sliding filter response loss for space-based radar
A discrete side-lobe clutter recognition method based on sliding filter response loss for space-based radar Open
Different from ground-based or airborne early warning radar, space-based radar (SBR) possesses large coverage capability. As a result, several discrete strong scatter points from the antenna side-lobe shares the same feature with the real …
View article: Sub retrograde geosynchronous orbit SAR: parameter design and performance analysis
Sub retrograde geosynchronous orbit SAR: parameter design and performance analysis Open
In recent years, geosynchronous synthetic aperture radar (GEO SAR) has attracted many scientists to carry out relevant research. Its research is in-depth and gradually maturing. However, conventional GEO SAR has the problems of great influ…
View article: An Extended Frequency Scaling Algorithm for Bistatic SAR With High Squint Angle
An Extended Frequency Scaling Algorithm for Bistatic SAR With High Squint Angle Open
Bistatic synthetic aperture radar (BiSAR) is an extended and complementary observation method to conventional monostatic SAR remote sensing. When high range and azimuth resolution are required in BiSAR, the transmitting platform, i.e., the…
View article: A Bright Squeezed Light Source for Quantum Sensing
A Bright Squeezed Light Source for Quantum Sensing Open
The use of optical sensing for in vivo applications is compelling, since it offers the advantages of non-invasiveness, non-ionizing radiation, and real-time monitoring. However, the signal-to-noise ratio (SNR) of the optical signal deterio…
View article: Transmit Beampattern Design for Distributed Satellite Constellation Based on Space–Time–Frequency DoFs
Transmit Beampattern Design for Distributed Satellite Constellation Based on Space–Time–Frequency DoFs Open
For distributed satellite constellations, detection performance can be equivalently regarded as a single large satellite by the cooperative operation of multiple small satellites, which is a promising research topic of the Next-Generation …
View article: Focus Improvement of Spaceborne-Missile Bistatic SAR Data Using the Modified NLCS Algorithm Based on the Method of Series Reversion
Focus Improvement of Spaceborne-Missile Bistatic SAR Data Using the Modified NLCS Algorithm Based on the Method of Series Reversion Open
The speed and direction of a missile shifts sharply in the dive phase, making the azimuth frequency modulation (FM) rate change with the azimuthal position, leading to azimuth ambiguities and image distortion. To solve this problem, a modi…
View article: Ionospheric Error Correction and Image Enhancement for Spaceborne Ice-Sounding Radar
Ionospheric Error Correction and Image Enhancement for Spaceborne Ice-Sounding Radar Open
Current ice-sounding radars can be divided into two categories, i.e., vehicular platform and airborne platform. The former possesses high detection accuracy, but its disadvantage restricts the measurement in narrow coverage range. The latt…
View article: LEO-Based Satellite Constellation for Moving Target Detection
LEO-Based Satellite Constellation for Moving Target Detection Open
With the rapid development of cooperative detection technology, target fusion detection with regard of LEO satellites can be realized by means of their diverse observation configurations. However, the existing constant false alarm ratio (C…
View article: Two-Step Thresholds TBD Algorithm for Time Sensitive Target Based on Dynamic Programming
Two-Step Thresholds TBD Algorithm for Time Sensitive Target Based on Dynamic Programming Open
Surveillance radar is confronted with serious two-dimensional ambiguity (i.e., range dimension and velocity dimension) and low signal-to-noise ratio (SNR) problems in the time sensitive (TS) target detection process, which may result in th…
View article: Efficient Identifying the Orientation of Single NV Centers in Diamond and Using them to Detect Near Field Microwave
Efficient Identifying the Orientation of Single NV Centers in Diamond and Using them to Detect Near Field Microwave Open
Arrays of NV centers in the diamond have the potential in the fields of chip-scale quantum information processing and nanoscale quantum sensing. However, determining their orientations one by one is resource intensive and time consuming. H…
View article: Sea Surface Wind Speed Retrieval from the First Chinese GNSS-R Mission: Technique and Preliminary Results
Sea Surface Wind Speed Retrieval from the First Chinese GNSS-R Mission: Technique and Preliminary Results Open
Launched on 5 June 2019, the BuFeng-1 A/B twin satellites were part of the first Chinese global navigation satellite system reflectometry (GNSS-R) satellite mission. In this letter, a brief introduction of the BF-1 mission and its prelimin…
View article: Improvement of non‐linear chirp‐scaling algorithm for highly squint bistatic SAR data focusing
Improvement of non‐linear chirp‐scaling algorithm for highly squint bistatic SAR data focusing Open
Bistatic synthetic aperture radar (SAR) has specific advantages, e.g. weak targets detecting, reducing system vulnerability, and anti‐interference with low cost and flexible working modes. However, great challenges exist in data processing…
View article: An Intelligent Sample Selection Method for Space-Time Adaptive Processing in Heterogeneous Environment
An Intelligent Sample Selection Method for Space-Time Adaptive Processing in Heterogeneous Environment Open
In the heterogeneous interference and target-rich environment, the clutter-plus-noise covariance matrix (CCM) estimate with a good match for the cell under test is significant for space–time adaptive processing. In this paper, an intellige…
View article: Comparative study of squeezed vacuum states prepared by using 1064-nm solid-state and fiber-laser as pump source
Comparative study of squeezed vacuum states prepared by using 1064-nm solid-state and fiber-laser as pump source Open
Squeezed states, which have fewer fluctuations in one quadrature than vacuum noise at the expense of increasing fluctuations in the other quadrature, can be used to enhance measurement accuracy, increase detection sensitivity, and improve …