| CPC G01S 7/4865 (2013.01) [G01S 7/4814 (2013.01); G01S 7/4816 (2013.01); G01S 7/487 (2013.01); G01S 17/10 (2013.01)] | 19 Claims |
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1. An apparatus, comprising:
a time-to-digital converter (TDC) configured to generate a plurality of signals, each signal having a total number of bits; and
a state machine responsive to the TDC and configured to:
create, in a memory, a first histogram of a first set of signals from the plurality of signals, wherein the first histogram has a fixed number of bins over a first range;
determine a first peak bin from the first histogram;
determine a region of interest of the first histogram based at least partially on a relationship between the first peak bin and half the fixed number of bins, wherein the region of interest is centered at the first peak bin and defined by a start bin and an end bin;
create a second histogram of a second set of signals from the plurality of signals using the total number of bits, wherein the second histogram has the fixed number of bins over the region of interest and wherein the bins of the second histogram have a smaller width than the bins of the first histogram; and
determine a second peak bin from the second histogram.
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