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.

Abstract: An emulation test system and method are provided for time adjusting emulated echo signals in response to a periodic electromagnetic signal.

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.

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.

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.

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.

Abstract: An emulation test system and method are provided for time adjusting emulated echo signals in response to a periodic electromagnetic signal.

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.

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.

Abstract: A differential transmission line includes a sheath, a first conductive structure, a second conductive structure, and a resistive layer. The first conductive structure is disposed along the differential transmission line and within the sheath, and contributes to formation of a three-dimensional electromagnetic field. The second conductive structure is disposed along the differential transmission line and within the sheath, and contributes to formation of the three-dimensional electromagnetic field. The resistive layer is aligned to be substantially perpendicular to an electric field component of a first mode of the three-dimensional electromagnetic field, and to provide absorption of an electric field component of a second mode of the three-dimensional electromagnetic field.

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.

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.

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.