A thorough analysis of various geometries for a dynamic calibration target for through-wall and through-rubble radar

2018 ◽  
Author(s):  
Ram M. Narayanan ◽  
Michael J. Harner ◽  
John R. Jendzurski ◽  
Nicholas G. Paulter
Keyword(s):  
Dynamic Calibration ◽  
Calibration Target

scholarly journals Analysis of a Dynamic Calibration Target for Through-Wall and Through-Rubble Motion Sensing Doppler Radar

Instruments ◽  
2021 ◽  
Vol 5 (4) ◽  
pp. 37
Author(s):  
Ram M. Narayanan ◽  
Michael J. Harner ◽  
John R. Jendzurski ◽  
Nicholas G. Paulter
Keyword(s):  
Doppler Radar ◽  
Human Motion ◽  
Human Detection ◽  
Dynamic Calibration ◽  
Motion Sensing ◽  
Calibration Target ◽  
Cross Sectional ◽  
Sensing Systems ◽  
Human Respiration ◽  
Field Deployment

Through-wall and through-barrier motion-sensing systems are becoming increasingly important tools to locate humans concealed behind barriers and under rubble. The sensing performance of these systems is best determined with appropriately designed calibration targets, which are ones that can emulate human motion. The effectiveness of various dynamic calibration targets that emulate human respiration, heart rate, and other body motions were analyzed. Moreover, these targets should be amenable to field deployment and not manifest angular or orientation dependences. The three targets examined in this thesis possess spherical polyhedral geometries. Spherical geometries were selected due to their isotropic radar cross-sectional characteristics, which provide for consistent radar returns independent of the orientation of the radar transceiver relative to the test target. The aspect-independence of a sphere allows for more accurate and repeatable calibration of a radar than using a nonspherical calibration artifact. In addition, the radar cross section (RCS) for scattering spheres is well known and can be calculated using far-field approximations. For Doppler radar testing, it is desired to apply these calibration advantages to a dynamically expanding-and-contracting sphere-like device that can emulate motions of the human body. Monostatic RCS simulations at 3.6 GHz were documented for each geometry. The results provide a visual way of representing the effectiveness of each design as a dynamic calibration target for human detection purposes.

Theoretical considerations for a dynamic calibration target for through-wall and through-rubble motion-sensing Doppler radar

2017 ◽  
Author(s):  
Michael J. Harner ◽  
Matthew J. Brandsema ◽  
Ram M. Narayanan ◽  
John R. Jendzurski ◽  
Nicholas G. Paulter
Keyword(s):  
Doppler Radar ◽  
Dynamic Calibration ◽  
Motion Sensing ◽  
Calibration Target ◽  
Theoretical Considerations

scholarly journals Dynamic Calibration of GPS Effective Isotropic Radiated Power for GNSS-Reflectometry Earth Remote Sensing

2021 ◽  
pp. 1-12
Author(s):  
Tianlin Wang ◽  
Christopher S. Ruf ◽  
Scott Gleason ◽  
Andrew J. O'Brien ◽  
Darren S. McKague ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Dynamic Calibration ◽  
Earth Remote Sensing ◽  
Radiated Power ◽  
Gnss Reflectometry

scholarly journals A Dynamic Calibration Method of Installation Misalignment Angles between Two Inertial Navigation Systems

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2947
Author(s):  
Ming Hua ◽  
Kui Li ◽  
Yanhong Lv ◽  
Qi Wu
Keyword(s):  
Autonomous Navigation ◽  
Inertial Navigation ◽  
Calibration Method ◽  
Measurement Information ◽  
Dynamic Calibration ◽  
Navigation Systems ◽  
Inertial Navigation Systems ◽  
Additional Information ◽  
Two Systems ◽  
Dynamic Calibration Method

Generally, in order to ensure the reliability of Navigation system, vehicles are usually equipped with two or more sets of inertial navigation systems (INSs). Fusion of navigation measurement information from different sets of INSs can improve the accuracy of autonomous navigation effectively. However, due to the existence of misalignment angles, the coordinate axes of different systems are usually not in coincidence with each other absolutely, which would lead to serious problems when integrating the attitudes information. Therefore, it is necessary to precisely calibrate and compensate the misalignment angles between different systems. In this paper, a dynamic calibration method of misalignment angles between two systems was proposed. This method uses the speed and attitude information of two sets of INSs during the movement of the vehicle as measurements to dynamically calibrate the misalignment angles of two systems without additional information sources or other external measuring equipment, such as turntable. A mathematical model of misalignment angles between two INSs was established. The simulation experiment and the INSs vehicle experiments were conducted to verify the effectiveness of the method. The results show that the calibration accuracy of misalignment angles between the two sets of systems can reach to 1″ while using the proposed method.

scholarly journals Dynamic calibration and seismic validation of numerical models of URM buildings through permanent monitoring data

2021 ◽  
Author(s):  
Serena Cattari ◽  
Stefania Degli Abbati ◽  
Sara Alfano ◽  
Andrea Brunelli ◽  
Filippo Lorenzoni ◽  
...  
Keyword(s):  
Numerical Models ◽  
Monitoring Data ◽  
Dynamic Calibration

Dynamic Calibration Method for Instrumented Laparoscopic Surgical Graspers1

2014 ◽  
Vol 8 (3) ◽  
Author(s):  
Michael Winek ◽  
Robert Sweet ◽  
Timothy M. Kowalewski
Keyword(s):  
Calibration Method ◽  
Dynamic Calibration ◽  
Dynamic Calibration Method

A Method of Making High-Speed Compression Tests on Small Copper Cylinders

1948 ◽  
Vol 15 (3) ◽  
pp. 248-255
Author(s):  
E. T. Habib
Keyword(s):  
High Speed ◽  
Underwater Explosion ◽  
Dynamic Calibration ◽  
Test Apparatus ◽  
Compression Tests ◽  
High Speeds

Abstract In mechanical gages used to measure the pressure from an underwater explosion, small copper cylinders are compressed at high speeds. This paper describes the test apparatus designed for the dynamic calibration of these cylinders, presents the results obtained with this apparatus, and compares these results with those obtained by other experimenters.

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