US 12,763,837 B1Granted

System for time domain receive channelization

AssigneeAmazon Technologies, Inc.

InventorsShannon L. Wanner, Kyle Regan Myers

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Abstract

A channel processing module (CPM) accepts digital raw samples of analog signals acquired by a phased array antenna. An oversampling channelizer oversamples by two times the raw samples and provides channel samples for each channel. One stream of channel samples may be downsampled by two times with the resulting samples processed by a beamformer algorithm to provide narrow channel beamformed samples representative of a narrow channel waveform. Two streams of channel samples may be processed using respective frequency translators that translate input samples by ±¼ the sampling frequency without multiplication, with the results being added to provide reconstructed samples that represent a wide channel waveform. The reconstructed samples may be processed by a beamformer algorithm to determine wide channel reconstructed samples. In other implementations, at least some operations may be performed after operation of the beamformer algorithms. The CPM and beamformer algorithm may be executed by a digital signal processor.

Claims20

Dependent claims

A system comprising:

an oversampling channelizer comprising:
a first input to receive raw samples acquired at a raw sample rate, wherein the raw samples are representative of one or more analog signals received using a phased array antenna;
and
a channelizer output, wherein the channelizer output sends a first stream associated with a first signal bandwidth, a second stream associated with the first signal bandwidth, and a third stream associated with a second signal bandwidth, wherein each one of the first stream, the second stream and the third stream comprises channel samples that are associated with a specified channel frequency range and are sampled at a sampling frequency that is oversampled from the raw samples by a factor of two relative to the raw sample rate, and wherein each one of the first stream, the second stream and the third stream is filtered by a low pass filter;
a first channel module comprising:
a first frequency translator comprising:
a first frequency translator input that is connected to the channelizer output and receives the first stream comprising first channel samples;
and
a first frequency translator output that sends first frequency translated samples, wherein each sample of the first channel samples is frequency translated up by one-quarter the sampling frequency;
a second frequency translator comprising:
a second frequency translator input that is connected to the channelizer output and receives the second stream comprising second channel samples;
and
a second frequency translator output that sends second frequency translated samples, wherein each sample of the second channel samples is frequency translated down by one-quarter the sampling frequency;
and
an adder comprising:
a first adder input that is connected to the first frequency translator output;
a second adder input that is connected to the second frequency translator output;
and
an adder output to send reconstructed samples comprising a sum of the first frequency translated samples and the second frequency translated samples;
and
a beamformer module comprising:
a first beamformer input to receive the reconstructed samples;
and
a first beamformer output to send first beamformed samples, wherein the first beamformed samples are generated by applying one or more beamforming operations to the reconstructed samples.

21 more elements

A system comprising:

an oversampling channelizer comprising:
a channelizer input to receive raw samples acquired at a raw sample rate, wherein the raw samples are representative of one or more analog signals received using a phased array antenna;
and
a channelizer output, wherein the channelizer output sends a first stream associated with a first signal bandwidth, a second stream associated with the first signal bandwidth, and a third stream associated with a second signal bandwidth, each stream comprising channel samples that are associated with a specified channel frequency range and are sampled at a sampling frequency that is oversampled from the raw samples by a factor of two relative to the raw sample rate;
a first module comprising;
a first input that receives the first stream comprising first channel samples;
a second input that receives the second stream comprising second channel samples;
a first frequency translator that applies a positive frequency translation to first input samples to generate first translated samples, wherein the first input samples comprise or are based on the first channel samples;
a second frequency translator that applies a negative frequency translation to second input samples to generate second translated samples, wherein the second input samples comprise or are based on the second channel samples;
an adder that sums third input samples and fourth input samples to generate reconstructed samples, wherein:
the third input samples comprise or are based on the first channel samples, and
the fourth input samples comprise or are based on the second channel samples;
and
a beamformer module that applies one or more beamforming operations to fifth input samples to generate first beamformed samples.

11 more elements

A computer-implemented method comprising:

receiving, at an oversampling channelizer, raw samples acquired at a raw sample rate, wherein the raw samples are representative of one or more analog signals received using a phased array antenna;
generating, with the oversampling channelizer by oversampling the raw samples by a factor of two relative to the raw sample rate:
a first stream comprising first channel samples associated with a first signal bandwidth and a first specified channel frequency range,
a second stream comprising second channel samples associated with the first signal bandwidth and a second specified channel frequency range, and
a third stream comprising third channel samples associated with a second signal bandwidth and a third specified channel frequency range;
processing first input samples comprising the first channel samples or samples based on the first channel samples using a first frequency translator that applies a positive frequency translation to the first input samples to generate first translated samples;
processing second input samples comprising the second channel samples or samples based on the second channel samples using a second frequency translator that applies a negative frequency translation to the second input samples to generate second translated samples;
adding third input samples and fourth input samples to generate reconstructed samples, wherein the third input samples comprise or are based on the first channel samples, and the fourth input samples comprise or are based on the second channel samples;
and
performing one or more beamforming operations to fifth input samples to generate first beamformed samples.

7 more elements

Dependencies are inferred from the claim text.