An Optical Multifrequency Phase-Modulation Method Using Microbeads for Measuring Intracellular Oxygen Concentrations in Plants

There are mainly two types of data modulation methods used for enhanced LOng-RAnge Navigation (eLORAN) systems: pulse position modulation (PPM) and supernumerary interpulse modulation (SIM). The typical application for PPM is tri-state PPM (3S-PPM), also known as Eurofix. The typical application for SIM is ninth pulse modulation. Both of these methods are phase modulation methods. Phase modulation coding, a very mature technology, is used at present. To achieve a better demodulation success rate of eLORAN digital modulation signals at longer distances, a method of using the transmitting station duplex mode to transmit a digital modulation pulse group after LORAN-C transmitting a pulse group is proposed to realize modulation pulse on–off modulation. In this method, a broadcasting experiment was performed on the BPL (The call sign of eLORAN time service system in China) broadcaster station. After monitoring, a good receiving demodulation effect was initially obtained.

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Communication Periodic Phase Modulation Method for Fast Diagnosis of Phased Array

IEEE Transactions on Antennas and Propagation ◽

10.1109/tap.2020.3021750 ◽

2020 ◽

pp. 1-1

Author(s):

Chong He ◽

Bai Lin ◽

Qun Chen ◽

Anjie Cao ◽

Jingfeng Chen ◽

...

Keyword(s):

Phase Modulation ◽

Phased Array ◽

Modulation Method

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Phase-modulation method of evaluation for opto-electronic system resolution evaluating under the real image

10.1117/12.243579 ◽

1996 ◽

Author(s):

Mikhail V. Smirnov ◽

Alexander N. Korolev

Keyword(s):

Phase Modulation ◽

Electronic System ◽

Modulation Method ◽

Real Image ◽

The Real ◽

Method Of Evaluation

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Research on a Novel Non Dead-Time Compensation Two-Phase Modulation SVPWM Control Strategy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.546-547.1050 ◽

2012 ◽

Vol 546-547 ◽

pp. 1050-1055

Author(s):

Bao Lian Liu ◽

De Fei Jin

Keyword(s):

Control Strategy ◽

Phase Modulation ◽

Pulse Width ◽

Pulse Width Modulation ◽

Dead Time ◽

Modulation Method ◽

Two Phase ◽

Switching Losses ◽

Dead Time Compensation ◽

Switching State

A space vector pulse-width modulation (SVPWM) strategy was developed to solve the failure of traditional SVPWM. A two-phase modulation method is adopted basing on the analyses of traditional SVPWM to select the null switching state in each sector according to the power factor angle. As a result, when the current is crossing zero, the corresponding phase does not commute and dead-time compensation is avoided; and when the current is nearing the peak, the corresponding phase also don’t commute, which leads to lower switching losses. The simulation and experimental results validate that the proposed strategy can effectively improve the current wave, minimize the current distortion and reduce the switching losses. Furthermore, the algorithm is easy to implement.

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