{"product_id":"advanced-doppler-tolerant-radar-codes-for-improved-target-detection-9798856206158","title":"Advanced Doppler Tolerant Radar Codes for Improved Target Detection","description":"\u003cp\u003e • Author(s): Ravi Kishore Singh\u003cbr\u003e • Publisher: Independently Published\u003cbr\u003e • Publisher Imprint: Independently Published\u003cbr\u003e • BISAC: Non-Classifiable\u003c\/p\u003e\u003cp\u003eAdvances in technologies in fighter aircrafts, missiles and ICBMs have forced the Radar\u003cbr\u003eand Communication Engineering research community to consistently pay attention to\u003cbr\u003edetect and locate the fast moving targets from the static radar using extremely sensitive\u003cbr\u003ereceivers which are often inherited with noise. State of art works mainly use matched\u003cbr\u003efilter (autocorrelation) of the received signal with delayed sample of transmitted signal to\u003cbr\u003eincrease the amplitude of the main lobe. However this process introduces side lobe which\u003cbr\u003eis the main cause for the loss of energy. The pulse compression technique combines the\u003cbr\u003eadvantage of high energy of a long pulse giving adequate range with the high resolution\u003cbr\u003eof a short pulse. This process is helpful in getting ample power transmitted for the radar\u003cbr\u003efor long ranges and the range resolution of a small pulse at the same time. It is\u003cbr\u003ecomparatively easy to detect the targets when it is stationary, and sidelobes at the output\u003cbr\u003eof merit factor can be made zero using various techniques. The masking of moving targets\u003cbr\u003eby the side lobe as a result of autocorrelation or the matched filtering hampers the\u003cbr\u003edetection of dangerously small fast moving targets like fighter aircrafts, drones and\u003cbr\u003emissiles etc.\u003cbr\u003eContinuous research to increase the Signal to Noise Ratio (SNR), Merit Factor (MF) and\u003cbr\u003eIntegrated Side Lobe Ratio (ISLR) also called discrimination factor were attempted by\u003cbr\u003emany authors. Barker codes gave good MF and ISLR by restricting the side lobe to the\u003cbr\u003evalue of one but barker codes were limited to a maximum length of 13. Minimum peak\u003cbr\u003eside lobe codes were attempted by many researchers using various optimizing techniques\u003cbr\u003elike Simulated Annealing, Bi-parental Product Algorithm, skew symmetric binary\u003cbr\u003esequences etc, but with multiple moving targets these approaches failed completely.\u003cbr\u003eAttempts were also made to improve the SNR using nested barker codes, mismatched\u003cbr\u003efiltering using longer binary codes by zero padding, Costas and many other codes, \u003cbr\u003ewindowing functions etc, however the problem of addressing the Doppler was still at\u003cbr\u003elarge. \u003c\/p\u003e\u003cp\u003e\u003c\/p\u003ePTM codes have been introduced to give clear window at zero or low Doppler values, \u003cbr\u003ewhere targets could be detected. Golay codes transmitted in PTM sequences have been\u003cbr\u003ereported to give better results considering oversampled codes. However the same could\u003cbr\u003enot be adopted easily for fast moving targets.\u003cbr\u003eIn this thesis we initially start with the development of binary codes, to increase the merit\u003cbr\u003efactor. However these approaches are good for stationary targets and slow moving targets.\u003cbr\u003eThe main objective is to develop codes to eliminate the side lobs and improve detection of\u003cbr\u003emultiple moving targets. We have attempted to develop the new set of binary codes which\u003cbr\u003ehelps to create clear windows at desired Doppler to detect multiple fast moving targets\u003cbr\u003ewith varying Doppler at different ranges. The sidelobes of the autocorrelation in these\u003cbr\u003ewindows are very low for entire range of the radar giving very good detection.\u003cbr\u003eThe work done in this thesis brings about a conceptual change in detection process by\u003cbr\u003ecreating Doppler windows at various frequencies for which detection is easy for the entire\u003cbr\u003erange of radar. These windows can be created at the desired Doppler in which the noise\u003cbr\u003eamplitude is very low and this makes the detection process very easy without ambiguity.\u003cbr\u003eMany techniques using binary and hex codes have been developed to create windows in\u003cbr\u003eDoppler where the noise levels are very low and these Doppler windows can be easily\u003cbr\u003ecreated at any desired Doppler. Entire practical range of Doppler frequencies based on\u003cbr\u003etarget speeds has been covered and many approaches have been designed to create very\u003cbr\u003elow noise in these windows to enhance detection. Fast moving targets at various Doppler\u003cbr\u003ecan be detected in multiple target scenarios.","brand":"Independently Published","offers":[{"title":"Paperback","offer_id":45560921129111,"sku":"9798856206158","price":2201.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/3471\/1191\/files\/9798856206158.webp?v=1768596715","url":"https:\/\/atlanticbooks.com\/products\/advanced-doppler-tolerant-radar-codes-for-improved-target-detection-9798856206158","provider":"Atlantic Books","version":"1.0","type":"link"}