طراحی شکل موج ارسالی رادار به منظور بالا بردن دقت تخمین تأخیر و فرکانس داپلر هدف با معیار CRB

نویسندگان

دانشگاه علم و صنعت ایران

چکیده

چکیده: در این مقاله، مسئله­ طراحی شکل­موج به منظور تخمین پارامترهای تأخیر و داپلر هدف، بر اساس معیار [i]CRB بررسی می­شود. پس از به دست آوردن حدود CRB، از مدل سیگنال OFDM برای طراحی شکل­موج استفاده می­شود و با حداقل کردن این حدود دو شکـل­مـوج طراحی می­شود. کارآیی شکل­موج­ها نیز با استفاده از تابع ابهام متقابل(CAF[ii])، مورد بررسی قرار گرفته و برای ارزیابی دقیق­تر از پـارامتر MF[iii] استفـاده می­شود. افزایش مقادیر MF، معادل افزایش احتمال آشکارسازی هدف در رادار است. نتایج شبیه­سازی نشان می­دهد که با استفاده از شکل­موج­های طراحی­شده، میزان MF افزایش می­یابد که این امر بیانگر کاهش پیک­های فرعی در تابع CAF و درنتیجه افزایش احتمال آشکارسازی هدف است.
 

کلیدواژه‌ها

عنوان مقاله [English]

Radar waveform design for increasing accuracy of delay and Doppler estimation of a target based on CRB

چکیده [English]

Abstract: In this paper, we investigate the problem of waveform design to estimate the delay and Doppler parameters of a target based on the Cramer-Rao Bound (CRB). After obtaining the CRBs, the OFDM signal model is used for the waveform design and by minimizing the CRBs two waveforms are obtained. The performance of waveforms is inspected using the Cross Ambiguity Function (CAF) and the Merit Factor (MF) is used for more evaluations. The increase of the MF is equivalent to the increase of the Probability of detection (Pd) of the target. Simulation results show that using the proposed waveforms, the amount of MF increases which is equivalent to decreasing the side lobes in the CAF and increasing the Pd of targets.

کلیدواژه‌ها [English]

  • Keywords: Radar waveform design
  • cognitive radar
  • estimation the delay and doppler of target
  • CRB for parameters of target

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