Todd Broughton Marshall

US Patent:

8213810, Jul 3, 2012

Filed:

Jun 22, 2009

Appl. No.:

12/489117

Inventors:

Bogdan Szafraniec - Sunnyvale CA, US
Todd Steven Marshall - Sunnyvale CA, US

Assignee:

Agilent Technologies, Inc. - Santa Clara CA

International Classification:

H04B 10/06

US Classification:

398204, 398203, 398207

Abstract:

An optical receiver and a method of demodulating an optical signal. The method includes combining a received optical signal with a local oscillator signal to construct a complex signal indicative of an optical field of the modulated optical signal and processing the complex signal recursively under control of a Kalman filter that enforces a constraint. The receiver includes an optical hybrid that combines a received optical signal with a local oscillator signal, a detector that recovers components of a complex signal, a processor that receives these components, and instructions that cause the processor to process the components of the complex signal recursively under control of a Kalman filter that enforces a constraint to recover data.

US Patent:

20080238405, Oct 2, 2008

Filed:

Mar 28, 2007

Appl. No.:

11/729105

Inventors:

Todd Steven Marshall - Sunnyvale CA, US
Rory Lynn Van Tuyl - Los Altos CA, US

International Classification:

G01R 23/16

US Classification:

324 7612

Abstract:

A radio-frequency (RF) measurement system for measuring a reflection coefficient an RF device under test (DUT) incorporates a reflection mode electro-absorption modulator (REAM) assembly coupled to the RF DUT. Also included in the measurement system, is a first optical fiber coupled to the REAM assembly, the first optical fiber configured to propagate a first optical signal into the REAM assembly and propagate a first reflected optical signal out of the REAM assembly. Furthermore, a second optical fiber is also coupled to the REAM assembly, the second optical fiber configured to propagate a second optical signal into the REAM assembly and propagate a second reflected optical signal out of the REAM assembly.

US Patent:

20220260674, Aug 18, 2022

Filed:

Feb 15, 2021

Appl. No.:

17/175761

Inventors:

- Santa Rosa CA, US
Todd Steven Marshall - Los Gatos CA, US
Gregory S. Lee - Mountain View CA, US
Natalie Killeen - Sebastopol CA, US
Christian Bourde - Santa Rosa CA, US

International Classification:

G01S 7/40
G01R 31/00

Abstract:

A miniature radar target simulator (MRTS) and a system comprising a plurality of MRTS's are described. The MRTS and system are useful for emulating echo signals for a radar DUT with reduced interference. Illustrative radar test systems desirably generate the intended (emulated) radar targets and reduce unwanted (“ghost”) signals, which can result in “ghost targets,” and errant/ambient electromagnetic radiation that reduces the performance and reliability of known re-illuminators and systems including same.

US Patent:

20220179043, Jun 9, 2022

Filed:

Dec 7, 2020

Appl. No.:

17/113465

Inventors:

- Santa Rosa CA, US
Todd Steven Marshall - Los Gatos CA, US
Jefferson B. Burch - Palo Alto CA, US
Gregory S. Lee - Mountain View CA, US

International Classification:

G01S 7/40
G01S 13/931

Abstract:

An apparatus is for generating an emulated radar reflection signal of a target. The apparatus includes a radar detector configured to detect a radar signal frame emitted by a device under test (DUT), an emulation transmitter configured to generate an emulated radar reflection signal of a target being emulated, and a processor configured to generate control signals which control the emulation transmitter according to at least one characteristic of the target being emulated. The processor is further configured to determine a current radar parameter among plural possible radar parameters of the radar signal frame of the DUT, and to adapt the control signals which control the emulation transmitter according to the determined current radar parameter of the radar signal frame of the DUT.

US Patent:

20220179044, Jun 9, 2022

Filed:

Jun 16, 2021

Appl. No.:

17/349678

Inventors:

- Santa Rosa CA, US
Todd Steven Marshall - Los Gatos CA, US
Jefferson B. Burch - Palo Alto CA, US
Gregory S. Lee - Mountain View CA, US

International Classification:

G01S 7/40

Abstract:

An apparatus is for generating an emulated radar reflection signal of a target moving at a relative velocity. The apparatus includes a radar detector, an emulation transmitter, and a processor. The radar detector is configured to detect radar chirps emitted by a device under test (DUT), where the chirps are emitted at random time intervals. The emulation transmitter is configured to generate emulated radar reflection signals of the target being emulated. The processor is configured to generate control signals at intervals corresponding to the random time intervals at which the radar chirps are emitted by the DUT, where each control signal controls the emulation transmitter to generate a radar reflection signal. A relative phase of the control signals is adjusted according to a duration of each of the random time intervals between successive chirps and a magnitude and sign of the relative velocity of the target.

US Patent:

20210356561, Nov 18, 2021

Filed:

May 16, 2021

Appl. No.:

17/321460

Inventors:

- Santa Rosa CA, US
Lee A. Barford - San Jose CA, US
Jefferson B. Burch - Palo Alto CA, US
Todd Steven Marshall - Los Gatos CA, US
Hong-Wei Kong - Beijing, CN

International Classification:

G01S 7/40
G01M 17/00
G01S 13/931
G06F 9/455

Abstract:

An emulation test system and method are provided for time adjusting emulated echo signals in response to a periodic electromagnetic signal. The method includes generating a scene simulation including a simulated object; generating a simulation frame indicating object transform information regarding the simulated object; calculating positions and velocities of an emulated targets corresponding to the simulated object using the object transform information; generating a ray tracing frame corresponding to the simulation frame indicating the calculated positions and velocities of the emulated targets; predicting a time point in a next feature in a feature pattern of the electromagnetic signal; calculating predicted target information of the simulated object at the predicted time point using the calculated positions and velocities; and generating an echo signal in response to the next burst of the electromagnetic signal using the predicted target information to compensate for latencies introduced by differences between real world and simulation times.

US Patent:

20190242755, Aug 8, 2019

Filed:

Feb 3, 2018

Appl. No.:

15/887994

Inventors:

- Minneapolis MN, US
Douglas Michael Baney - Los Altos CA, US
Todd Steven Marshall - Los Gatos CA, US
Gregory Douglas VanWiggeren - San Jose CA, US

International Classification:

G01J 5/08
G01J 5/00
H04B 17/17
H04B 17/29

Abstract:

Illustrative embodiments disclosed herein pertain to a thermal imaging system that includes a thermal imaging sheet having an array of thermal unit cells for generating a thermal footprint in response to receiving an RF signal. The thermal footprint is composed of an array of hotspots having a first set of hotspots indicative of a radiation characteristic of a first polarization component of the RF signal, and a second set of hotspots indicative of a radiation characteristic of a second polarization component of the RF signal. Each thermal unit cell includes a first RF antenna and a second RF antenna oriented orthogonal with respect to each other. The first RF antenna includes a terminating resistor that generates a hotspot among the first set of hotspots and the second RF antenna includes another terminating resistor that generates a hotspot in the second set of hotspots.