Patent ID: 11867844
Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 10:
11. A Lidar system, comprising:
a photonic chip configured to generate a chirp signal and receive a reflected light beam that is a reflection of the chirp signal from an object, the chirp signal having an associated bandwidth;
a photodetector of the photonic chip configured to generate an electrical signal in response to receiving the reflected light beam, a bandwidth of the electrical signal being the same as the bandwidth of the chirp signal;
a spectrum analyzer including:
a power divider configured to partition the electrical signal by frequency into a plurality of channels;
a first comb filter and a second comb filter, wherein the first comb filter includes a first plurality of outlets spaced by frequency and the second comb filter includes a second plurality of outlets spaced by frequency, wherein the frequencies of the first plurality of outlets and the frequencies of the second plurality of outlets are interleaved and span the bandwidth of the electrical signal, wherein the power divider partitions the channels sequentially by frequency with a first channel directed to a first outlet of the first comb filter, a second channel directed to a first outlet of the second comb filter and returning to the first comb filter to repeat the frequency partitioning the electrical signal;
an analog-to-digital converter configured associated with a selected channel one of the first comb filter and the second comb filter to convert the electrical signal within the selected channel from an analog signal to a digital signal;
a comb filter configured to provide the output from the selected channel of the power divider to the analog-to-digital converter; and

a processor configured to determine a parameter of the object from the digital signal in the selected channel.