18-02-2016 дата публикации
Номер: US20160047891A1
Принадлежит:
Systems, methods, and devices may enhance the apparent sample rate of data collected using Nyquist sampling from a system, such as Continuous Wave (CW) Light detection and ranging (“Lidar”), Radio detection and ranging (“Radar”), or Sound Navigation and Ranging (“Sonar”), that has been modulated with a repeating waveform, such as linear swept frequency, by reordering of the data in the frequency domain. The enhancement of the apparent sample rate may result in a highly interpolated range profile where the data resolution may be enhanced by a factor equal to the number of repeats in the signal being processed, and may result in a highly detained range measurement with a high precision. The various embodiments may combine data from multiple modulation repeats into a single highly interpolated pulse, which may result in a real-time finer range measurement from CW Lidar, Radar, or Sonar systems. 1. An interpolated range finding method , comprising:receiving, at a processor, a Nyquist sampled reference signal and a Nyquist sampled received signal from a ranging system;determining, at the processor, a discrete Fourier transform (“DFT”) of the reference signal;determining, at the processor, a DFT of the received signal;multiplying, at the processor, the DFT of the reference signal and the DFT of the received signal to generate array elements of the combined signals;reordering, at the processor, the array elements;determining, at the processor, an inverse DFT of the reordered array elements; anddetermining, at the processor, a range to a target based at least in part on the inverse DFT of the reordered array elements.2. The method of claim 1 , wherein the Nyquist sampled reference signal and the Nyquist sampled received signal are sampled higher than the Nyquist rate.3. The method of claim 2 , wherein reordering claim 2 , at the processor claim 2 , the array elements comprises reordering claim 2 , at the processor claim 2 , the array elements such that the spacing between ...
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