Coherent optical ring using common local oscillator

1990 ◽  
Vol 26 (14) ◽  
pp. 1013
Author(s):  
M.-S. Kao ◽  
J. Wu
Keyword(s):  
Local Oscillator ◽  
Optical Ring

USE OF A CO2LASER AS A LOCAL OSCILLATOR FOR A 10 MICRON HETERODYNE DETECTION

1987 ◽  
Vol 48 (C7) ◽  
pp. C7-569-C7-571
Author(s):  
A. DELAHAIGUE ◽  
D. COURTOIS ◽  
C. THIEBEAUX ◽  
H. LE CORRE
Keyword(s):  
Local Oscillator ◽  
Heterodyne Detection

Enhanced FSR Asymmetrical Triple Optical Ring Resonator

2020 ◽  
Author(s):  
Parnab Saha ◽  
Sumanta Kundu ◽  
Sanjoy Mandal
Keyword(s):  
Ring Resonator ◽  
Optical Ring ◽  
Optical Ring Resonator

scholarly journals A Local Oscillator Phase Compensation Technique for Ultra-Wideband Stepped-Frequency Continuous Wave Radar Based on a Low-Cost Software-Defined Radio

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 780
Author(s):  
Kazunori Takahashi ◽  
Takashi Miwa
Keyword(s):  
Software Defined Radio ◽  
Initial Phase ◽  
Continuous Wave ◽  
Low Cost ◽  
Local Oscillator ◽  
The Other ◽  
Ultra Wideband ◽  
Single Frequency ◽  
Wave Radar ◽  
Stepped Frequency

The paper discusses a way to configure a stepped-frequency continuous wave (SFCW) radar using a low-cost software-defined radio (SDR). The most of high-end SDRs offer multiple transmitter (TX) and receiver (RX) channels, one of which can be used as the reference channel for compensating the initial phases of TX and RX local oscillator (LO) signals. It is same as how commercial vector network analyzers (VNAs) compensate for the LO initial phase. These SDRs can thus acquire phase-coherent in-phase and quadrature (I/Q) data without additional components and an SFCW radar can be easily configured. On the other hand, low-cost SDRs typically have only one transmitter and receiver. Therefore, the LO initial phase has to be compensated and the phases of the received I/Q signals have to be retrieved, preferably without employing an additional receiver and components to retain the system low-cost and simple. The present paper illustrates that the difference between the phases of TX and RX LO signals varies when the LO frequency is changed because of the timing of the commencement of the mixing. The paper then proposes a technique to compensate for the LO initial phases using the internal RF loopback of the transceiver chip and to reconstruct a pulse, which requires two streaming: one for the device under test (DUT) channel and the other for the internal RF loopback channel. The effect of the LO initial phase and the proposed method for the compensation are demonstrated by experiments at a single frequency and sweeping frequency, respectively. The results show that the proposed method can compensate for the LO initial phases and ultra-wideband (UWB) pulses can be reconstructed correctly from the data sampled by a low-cost SDR.

Dual Local Oscillator SIS Receiver for Simultaneous Observations of Water Isotopologues in the Solar System

2020 ◽  
pp. 1-1
Author(s):  
Jacob Willem Kooi ◽  
Darren Hayton ◽  
Paul Goldsmith ◽  
Dariusz Lis ◽  
Jonathan Kawamura ◽  
...  
Keyword(s):  
Solar System ◽  
Local Oscillator ◽  
Sis Receiver ◽  
Water Isotopologues

DDS-Based Local Oscillator for Radio Telescope Receiver

2020 ◽  
Author(s):  
Eugene Alekseev ◽  
Vyacheslav Zakharenko ◽  
Vladislav Budnikov
Keyword(s):  
Radio Telescope ◽  
Local Oscillator
Sign in / Sign up

Export Citation Format

Share Document