How Long to Read Advanced Doppler Tolerant Radar Codes for Improved Target Detection

How Long Does it Take to Read Advanced Doppler Tolerant Radar Codes for Improved Target Detection?

It takes the average reader to read Advanced Doppler Tolerant Radar Codes for Improved Target Detection by Ravi Kishore Singh

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Description

Advances in technologies in fighter aircrafts, missiles and ICBMs have forced the Radar and Communication Engineering research community to consistently pay attention to detect and locate the fast moving targets from the static radar using extremely sensitive receivers which are often inherited with noise. State of art works mainly use matched filter (autocorrelation) of the received signal with delayed sample of transmitted signal to increase the amplitude of the main lobe. However this process introduces side lobe which is the main cause for the loss of energy. The pulse compression technique combines the advantage of high energy of a long pulse giving adequate range with the high resolution of a short pulse. This process is helpful in getting ample power transmitted for the radar for long ranges and the range resolution of a small pulse at the same time. It is comparatively easy to detect the targets when it is stationary, and sidelobes at the output of merit factor can be made zero using various techniques. The masking of moving targets by the side lobe as a result of autocorrelation or the matched filtering hampers the detection of dangerously small fast moving targets like fighter aircrafts, drones and missiles etc. Continuous research to increase the Signal to Noise Ratio (SNR), Merit Factor (MF) and Integrated Side Lobe Ratio (ISLR) also called discrimination factor were attempted by many authors. Barker codes gave good MF and ISLR by restricting the side lobe to the value of one but barker codes were limited to a maximum length of 13. Minimum peak side lobe codes were attempted by many researchers using various optimizing techniques like Simulated Annealing, Bi-parental Product Algorithm, skew symmetric binary sequences etc, but with multiple moving targets these approaches failed completely. Attempts were also made to improve the SNR using nested barker codes, mismatched filtering using longer binary codes by zero padding, Costas and many other codes, windowing functions etc, however the problem of addressing the Doppler was still at large. PTM codes have been introduced to give clear window at zero or low Doppler values, where targets could be detected. Golay codes transmitted in PTM sequences have been reported to give better results considering oversampled codes. However the same could not be adopted easily for fast moving targets. In this thesis we initially start with the development of binary codes, to increase the merit factor. However these approaches are good for stationary targets and slow moving targets. The main objective is to develop codes to eliminate the side lobs and improve detection of multiple moving targets. We have attempted to develop the new set of binary codes which helps to create clear windows at desired Doppler to detect multiple fast moving targets with varying Doppler at different ranges. The sidelobes of the autocorrelation in these windows are very low for entire range of the radar giving very good detection. The work done in this thesis brings about a conceptual change in detection process by creating Doppler windows at various frequencies for which detection is easy for the entire range of radar. These windows can be created at the desired Doppler in which the noise amplitude is very low and this makes the detection process very easy without ambiguity. Many techniques using binary and hex codes have been developed to create windows in Doppler where the noise levels are very low and these Doppler windows can be easily created at any desired Doppler. Entire practical range of Doppler frequencies based on target speeds has been covered and many approaches have been designed to create very low noise in these windows to enhance detection. Fast moving targets at various Doppler can be detected in multiple target scenarios.

How long is Advanced Doppler Tolerant Radar Codes for Improved Target Detection?

Advanced Doppler Tolerant Radar Codes for Improved Target Detection by Ravi Kishore Singh is 0 pages long, and a total of 0 words.

This makes it 0% the length of the average book. It also has 0% more words than the average book.

How Long Does it Take to Read Advanced Doppler Tolerant Radar Codes for Improved Target Detection Aloud?

The average oral reading speed is 183 words per minute. This means it takes to read Advanced Doppler Tolerant Radar Codes for Improved Target Detection aloud.

What Reading Level is Advanced Doppler Tolerant Radar Codes for Improved Target Detection?

Advanced Doppler Tolerant Radar Codes for Improved Target Detection is suitable for students ages 2 and up.

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