 | Kishore, M. Sankar |
 |
 | Automatic Target Handing Over System
Author : Kishore, M. Sankar
Source : Defence Science Journal ; Vol:44(1) ; 1994 ; pp 69-80
Subject : 621.38 Electronics;681.2 Instrumentation
Keywords : Airborne seeker;High resolution sensor;Sensors
Abstract : The image seen by the airborne seeker and the image (of the same scene) seen by the operator through the high resolution sensor (thermal sight) are different in spatial resolution. In order to establish the correlation between these two images, the thermal sight image needs to be resampled and made similar to the seeker image by applying a preprocessing technique. The preprocessing is carried out by a handling over system (HOS) that resamples the thermal sight image making it compatible with seeker image and hands over the resampled image to the seeker. This paper discusses the implementation of the suitable handling over algorithm. (Boland, J.S. et al. automatic target hand using correlation techniques. Technical report, Auburn University, Alabama, 31 January, 1977, pp.57-63). Emphasis is laid on developing suitable hardware and software and tests to match the two images obtained by two different sensors of the same scene. The hardware and software have been evaluated with sets of images. The H/W is designed around iAPX 86 family of processor and software is developed in PL/M. Hardware also includes the recording facility on a standard VCR, to record the performance of handling over electronics (HOE) during testing/flight trials. Evaluation of the system by realistically simulating the field scenario in the laboratory has shown that the HOS is functioning satisfactorily. |
| | Target Handing over System using Pyramid Processing
Author : Kishore, M. Sankar
Source : Defence Science Journal ; Vol:49(1) ; 1999 ; pp 41-48
Subject : 623.4.021 Targets;623.4 Armaments and Ballistics
Keywords : Pyramid processing techniques ;Pre processing techniques;High resolution (HR) sensor;Low resolution (LR) sensor
Abstract : "The image seen by the low resolution (LR) sensor and the image (of the same scene) seen by the operator through the high resolution (HR) sensor are different in spatial resolution. To establish the correlation between these two images, the HR image needs to be resampled and made similar to the LR sensor image by applying a pre-processing technique. The pre-processing will be carried out by handing over system that resamples the HR sensor image making it compatible with LR sensor image and hands over the resampled image to the LR sensor through a serial link. The pre-processing technique reported by Boland has been studied, analysed and implemented using 86 family of processors. Automatic target handing over system discusses the implementation of pre-processing technique, computational complexity and criticality of the execution time. The execution time reported was 1.5 s, whereas the requirement is of the order of few milliseconds for the typical set of conditions. This paper discusses the implementation of a suitable handing over algorithm. Emphasis has been to develop hardware and software to reduce the execution time, which has been brought down from 1.5 s to 40 ms for a typical set of conditions. Emphasis has also been given to reduce the transmission time by applying suitable pyramid processing techniques. The hardware is designed around i486 processor, and the software is developed in PL/M86. " |
|
