Encoded Hybrid PSK/FSK Waveform for LPI Radar
Shaik Maznu1, I. A. Pasha2, P. Chandrasekhar Reddy3

1Shaik Maznu, Assoc. Professor, Department of ECE, Vidya Jyothi Institute of Technology, Hyderabad, T.S., India.
2Dr. I. A. Pasha, Professor, Department of ECE, B.V.R.I.T, Narsapur, Medak Dist., T.S., India.
3Dr. P. Chandrasekhar Reddy, Professor, Department of ECE,JNTUH College of Engineering, Hyderabad, T.S., India.
Manuscript received on March 12, 2020. | Revised Manuscript received on March 25, 2020. | Manuscript published on March 30, 2020. | PP: 2753-2760 | Volume-8 Issue-6, March 2020. | Retrieval Number: F8492038620/2020©BEIESP | DOI: 10.35940/ijrte.F8492.038620

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Abstract: Since the advantage of pulse compression radar, the pseudo random codes and poly time codes and non linear frequency modulation has been mostly widely used low probability intercept (LPI) radar waveforms. By changing frequencies time to time in frequency modulation known as non-linear frequency modulation (frequency hopping (FH)), peak to side lobe ratio (PSLR) can be achieved to make less severe the covering effect of nearby targets and to improve the useful dynamic range. Adding an appropriate binary encoded ternary phase shift signal (PSK) as form as Binary encoded Hybrid-PSK/FSK (BEH PSK/FSK), the peak side lobe ratios are obtained very low values (e.g., PSLR<-70dB), similar to the antenna side lobes. In advanced microwave power amplifier technology, now a day’s using low peak to average power modules requires them to be amalgamated at the radio frequency (RF) stage in that way to obtain the required emitted radiated power. The deterministic waveforms are represents Noise waveform radar technology is a valid alternative. The pseudo-random waveform-realization of a noise process, the higher its bandwidth-time (or BT) product, the lower the (numerical) peak side lobe ratio. With practical Bandwidth-time values, the achievable peak side lobe using pure random is not sufficient the generated pseudorandom waveforms undergoes optimized genetic algorithm Hamming Scan (HS) to achieve optimized pseudo random (OBC), in order to achieve the desired side lobe level. This manuscript proposes a general analysis of the two modes of radar waveforms, i.e., Ternary and Binary alphabetic waveforms of coincidence detection.
Keywords: Hybrid PSK/FSK waveform, LPI Radar, Hamming scan, Hamming Back Track, Degree of Freedom, Coincidence Detection, DF, PSLR.
Scope of the Article: Radar and Satellite.