Scale Test Study for Echo Characteristic of the Submarine Model
The control software can quickly simulate the echo characteristic of a large number of targets, which include abundant information, and it is of high accuracy and good averaging performance. This software can provide software support for improving the radar simulator performance.
Basing on OpenGL, the geometrical model is transformed into the visual image on the computer's screen, and target surface's normal vector and space included in the information of pixels are obtained. Instead of computing the surface integral directly, the forecast of echo characteristic of underwater target is achieved by calculating the sum of the contribution from all the pixels in the screen image.
Calculating Software TESSYS of the echo characteristics of submerged targets and its application
On the basis of Kirchhoff approximate equation, a new approach - GRACO (Graphical Acoustics Computing) is developed for forecasting the echo characteristics of underwater targets in real time. Using 3D graphic processing system, the geometrical model of complex underwater target is established.
To build an appropriate mathematic model of dynamic targets tracked by radars and thus to reproduce the movement and echo characteristics of the target for realizing dynamic target simulation,a new method is put forward using radar data measured in real world environment.
Focused on these problems,the ultrasonic echo characteristics of the spot welding defects were analyzed mainly with the qualitative characteristic parameter analysis,which can identify the spot welding defects quickly through collecting the standard ultrasonic curves and using peak-value marking algorithm.
It was detected that echo signals with coherent echo characteristics are observed during all local time hours and at different levels of geomagnetic activity.
The metastases produced a variety of echo characteristics: masses with well-defined margins, hyperechoic foci and sonolucent or hypoechoic nodules with posterior attenuation or lacking posterior enhancement.
A detailed analysis of high-resolution seismic data (Chirp, 2-7?kHz) in the Ulleung Basin reveals spatial variation in echo characteristics and geometry of large-scale debris lobes.
Sediment types were identified from echo characteristics and by comparison with granulometric data.
The evolutions of two slow-moving convective mesosystems observed in Venezuela during VIMHEX-II were studied using time changes in radar echo characteristics.