Quad Code Sequence Generation Using Cyclic Redundancy Technique to Enhance Target Detection in Doppler Rader
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ORIGINAL ARTICLE
Quad Code Sequence Generation Using Cyclic Redundancy Technique to Enhance Target Detection in Doppler Rader Rajkumar D. Bhure1 · K. Manjunathachari1 Received: 10 April 2019 / Revised: 14 May 2020 / Accepted: 9 August 2020 © The Korean Institute of Electrical Engineers 2020
Abstract Today’s world is contemplating to set the new developments in radar to face the security challenges in defense. In the scope of radar signal processing, technical expertise in the signal processing, coding theory and techniques brought a lot of exposers to improve the detection probability in terms of range and position. The present art of work focusing on the detection of multiple moving targets using Doppler radar. Though the existing approaches try to increase the Merit Factor and range resolution of the acquired Signal, As such methods fail to find out the target when they are in multiple and moving, due to which the amplitude of the side spikes (Noise) is much more with respect to the highest detectable limit. Those side spikes dominate the probability of detection of a target because the weak echoes from the small targets may be masked by these side spikes of huge moving targets. This recommended approach provides clear information about the targets with respect to Doppler by creating multiple clear windows at various Doppler’s with respect to the range. The amplitude of all windows is below 85–90 dB down, so all moving targets can be easily detected. This approach is validating by the use of Mat lab. Keywords Quad code · Trellis coding technique · Doppler · Mat lab · Side spikes
1 Introduction The radar performance is broadly divided into two parts, one deals with the target detection, and the next one estimates the target parameters such as the velocity, the acceleration, the range and the size of the target. But the target detection including its parameter evaluation has become a very intricate practical problem, for small and/or at the far distance. In general, the performance of radar resolution will be challenging in terms of the intelligence to differentiate the desired object in multi-target circumstances also close to each other. Continuing to this, the challenging issues are to be identified and judge the problems, as soon as the target is found in multiple and moving situations. This resolution, therefore, becomes an important constraint in every analysis associated with this high-performance radars.
* Rajkumar D. Bhure [email protected] K. Manjunathachari [email protected] 1
GITAM University, Rudraram, Hyderabad, Telangana, India
However one must address initially the interference from numerous targets. Radar that can sense the target and specifically determine its range and speed. Even high-resolution radars fail to detect the targets in a multi-target scenario. Range (R) of the pulse radar can be evaluated with the help of senders pulse width and velocity by the relation R = C Tp/2, Where C represents the speed of light, Tp is the pulse width and dividing factor 2 depicts t
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