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Abstract
Through modeling we explored the possibility of utilizing a sparse frequency linear frequency modulation (LFM) signal for laser radar (ladar) applications. We propose a potential transmit and receive experiment utilizing the superposition of two LFM laser sources with a known difference frequency to provide the necessary segmented bandwidth. Finally we analyzed the signal performance of the proposed system showing that the range resolution of the signal can be improved by two to three times while utilizing the same modulator bandwidth as that of a continuous LFM signal.
Highlights
The range resolution of laser radar systems is dependent on the bandwidth of the transmitted laser signal
Since frequency is the derivative of phase, a quadratic phase waveform will result in a linear frequency chirp, or has a linear frequency modulation (LFM) in time
We programmed an algorithm to record the full width at half maximum (FWHM) (-3dB) of the central lobe as well as the peak to side lobe ratio (PSLR) as the simulation stepped through 1MHz difference frequency increments
Summary
The range resolution of laser radar (ladar) systems is dependent on the bandwidth of the transmitted laser signal. For this reason chirped signals, which have the advantage of increasing the bandwidth of the signal while maintaining relatively large pulse durations, have become the most popular form of radar signals [1] Borrowing this technique directly from the radar community and applying it towards ladar systems is not entirely possible. Since frequency is the derivative of phase, a quadratic phase waveform will result in a linear frequency chirp, or has a linear frequency modulation (LFM) in time While this technique is relatively well developed in the radar community [1, 5, 6], LFM signal generators for ladar applications have the potential to be even better since the higher optical frequencies can handle much larger (higher bandwidth) LFM chirps. In this paper we analyze the processing of these signals and analyze the improvement in range resolution
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