International Journal of Computer Applications |
Foundation of Computer Science (FCS), NY, USA |
Volume 69 - Number 16 |
Year of Publication: 2013 |
Authors: A. Naga Jyothi, K. Raja Rajeswari |
10.5120/12045-8082 |
A. Naga Jyothi, K. Raja Rajeswari . Modelling of LFM Spectrum as Rectangle using Steepest Descent Method. International Journal of Computer Applications. 69, 16 ( May 2013), 13-17. DOI=10.5120/12045-8082
The chirp or LFM waveform has superior performance in radars since they can be easily processed and generated. The amount of compression in pulse compression radar is determined by time-bandwidth product. The LFM waveform exhibits very high time-bandwidth product. The transform of this LFM waveform is flat over its range of frequencies. The signal spectrum will become fairly rectangular if time-bandwidth product is increased. The bigger the time-bandwidth product the higher is the robustness of radar transmitter. The focus of this paper is on steepest descent method which when applied to the LFM wave form gets the signal spectrum as a rectangle i. e totally flat over its range of frequencies. By using this method a ideal rectangle spectrum is achieved, which utilizes the total pulse and offers an optimal spectral density. This steepest descent approximated LFM waveform offer high resolution on the time axis and is therefore best suited for ranging.