scholarly journals Direct Position Determination of Coherent Pulse Trains Based on Doppler and Doppler Rate

Electronics ◽  
2018 ◽  
Vol 7 (10) ◽  
pp. 262 ◽  
Author(s):  
Guizhou Wu ◽  
Min Zhang ◽  
Fucheng Guo ◽  
Xuebing Xiao
Keyword(s):  
Frequency Shift ◽  
Doppler Frequency ◽  
Doppler Frequency Shift ◽  
Superior Performance ◽  
Observation Window ◽  
Localization Accuracy ◽  
Position Determination ◽  
Pulse Trains ◽  
Coherent Pulse ◽  
Large Observation

Direct Position Determination (DPD) of coherent pulse trains using a single moving sensor is considered in this paper. Note that when a large observation window and relative maneuvering course between emitter and receiver both exist, the localization accuracy of Doppler frequency shift only based DPD will decline because of the noticeable Doppler frequency shift variations. To circumvent this problem, a Doppler frequency shift and Doppler rate based DPD approach using a single moving sensor is proposed in this paper. First, the signal model of the intercepted coherent pulse trains is established where the Doppler rate is taken into consideration. Then, the Maximum Likelihood based DPD cost function is given, and the Cramer–Rao lower bound (CRLB) on localization is derived whereafter. At last, the Monto Carlo simulations demonstrate that in one exemplary scenario the Doppler frequency shift variations are noticeable with a large observation window and the proposed method has superior performance to the DPD, which is only based on the Doppler frequency shift.

scholarly journals Modeling of Doppler frequency shift in multipath radiochannels

2016 ◽  
Vol 2 (2) ◽  
pp. 57-63
Author(s):  
Максим Пензин ◽  
Maksim Penzin ◽  
Николай Ильин ◽  
Nikolay Ilyin
Keyword(s):  
Frequency Shift ◽  
Pulse Sequence ◽  
Radio Channel ◽  
Doppler Frequency ◽  
Single Pulse ◽  
Signal Propagation ◽  
Doppler Frequency Shift ◽  
Rate Of Change ◽  
Change In The Mean ◽  
Coherent Pulse

We discuss the modeling of propagation of a quasi-monochromatic radio signal, represented by a coherent pulse sequence, in a non-stationary multipath radio channel. In such a channel, signal propagation results in the observed frequency shift for each ray (Doppler effect). The modeling is based on the assumption that during propagation of a single pulse a channel can be considered stationary. A phase change in the channel transfer function is shown to cause the observed frequency shift in the received signal. Thus, instead of measuring the Doppler frequency shift, we can measure the rate of change in the mean phase of one pulse relative to another. The modeling is carried out within the framework of the method of normal waves. The method enables us to model the dynamics of the electromagnetic field at a given point with the required accuracy. The modeling reveals that a local change in ionospheric conditions more severely affects the rays whose reflection region is in the area where the changes occur.

scholarly journals Modeling of Doppler frequency shift in multipath radio channels

2016 ◽  
Vol 2 (2) ◽  
pp. 66-76
Author(s):  
Максим Пензин ◽  
Maksim Penzin ◽  
Николай Ильин ◽  
Nikolay Ilyin
Keyword(s):  
Frequency Shift ◽  
Pulse Sequence ◽  
Radio Channel ◽  
Phase Variation ◽  
Doppler Frequency ◽  
Single Pulse ◽  
Signal Propagation ◽  
Doppler Frequency Shift ◽  
Coherent Pulse ◽  
The Mean

We discuss the modeling of propagation of a quasi-monochromatic radio signal, represented by a coherent pulse sequence, in a non-stationary multipath radio channel. In such a channel, signal propagation results in the observed frequency shift for each ray (Doppler effect). The modeling is based on the assumption that during propagation of a single pulse a channel can be considered stationary. A phase variation in the channel transfer function is shown to cause the observed frequency shift in the received signal. Thus, instead of measuring the Doppler frequency shift, we can measure the rate of variation in the mean phase of one pulse relative to another. The modeling is carried out within the framework of the method of normal waves. The method enables us to model the dynamics of the electromagnetic field at a given point with the required accuracy. The modeling reveals that a local change in ionospheric conditions more severely affects the rays whose reflection region is in the area where the changes occur.

Rotational Doppler Frequency Shift from Time‐Evolving High‐Order Pancharatnam–Berry Phase: A Metasurface Approach

2021 ◽  
pp. 2000576
Author(s):  
Fuyong Yue ◽  
A. Aadhi ◽  
Riccardo Piccoli ◽  
Vincenzo Aglieri ◽  
Roberto Macaluso ◽  
...  
Keyword(s):  
Frequency Shift ◽  
Berry Phase ◽  
Doppler Frequency ◽  
Doppler Frequency Shift ◽  
High Order

scholarly journals Broadband Laser Doppler Frequency Shift Emulator for Satellite Laser Communication

2019 ◽  
Vol 11 (6) ◽  
pp. 1-12
Author(s):  
Jinye Li ◽  
Yuan Yao ◽  
Guozhang Wu ◽  
Jiaqing Hou ◽  
Wenqi Yu ◽  
...  
Keyword(s):  
Frequency Shift ◽  
Doppler Frequency ◽  
Doppler Frequency Shift ◽  
Laser Doppler ◽  
Laser Communication ◽  
Satellite Laser Communication ◽  
Broadband Laser
Sign in / Sign up

Export Citation Format

Share Document