摘要 :
High-frequency(HF) skywave over-the-horizon
radar(OTHR) looks down its targets from the ionosphere, it
has a large operating range and a large cover areas, but it
received a large-amplitude backscatterer echo form the
terrain...
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High-frequency(HF) skywave over-the-horizon
radar(OTHR) looks down its targets from the ionosphere, it
has a large operating range and a large cover areas, but it
received a large-amplitude backscatterer echo form the
terrain and sea, and strong interference, such as, radio
frequency interference, industrial interference, impulsive
noise, lightning impulsive, meteor trail echoes and so on.
Interference can be divided into long time interference and
transient interference, transient interference lasts a short
time, but its intensity is great. This paper first discusses the
character of transient interference, and uses eigen-
decomposition to separate the sea clutter subspace and
filter it, or filters terrestrial clutter in frequency domain and
back to time domain, then the transient interference is
detected, after that the transient interference are excised
from the original echoes, finally, the excised clutter and
target echoes are predicted by Burg linear prediction
algorithm. This processing method has been successfully
applied to the real data from China experimental OTHR.
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摘要 :
High-frequency(HF) skywave over-the-horizon
radar(OTHR) looks down its targets from the ionosphere, it
has a large operating range and a large cover areas, but it
received a large-amplitude backscatterer echo form the
terrain...
展开
High-frequency(HF) skywave over-the-horizon
radar(OTHR) looks down its targets from the ionosphere, it
has a large operating range and a large cover areas, but it
received a large-amplitude backscatterer echo form the
terrain and sea, and strong interference, such as, radio
frequency interference, industrial interference, impulsive
noise, lightning impulsive, meteor trail echoes and so on.
Interference can be divided into long time interference and
transient interference, transient interference lasts a short
time, but its intensity is great. This paper first discusses the
character of transient interference, and uses eigen-
decomposition to separate the sea clutter subspace and
filter it, or filters terrestrial clutter in frequency domain and
back to time domain, then the transient interference is
detected, after that the transient interference are excised
from the original echoes, finally, the excised clutter and
target echoes are predicted by Burg linear prediction
algorithm. This processing method has been successfully
applied to the real data from China experimental OTHR.
收起
摘要 :
High-frequency(HF) skywave over-the-horizon
radar(OTHR) looks down its targets from the ionosphere, it
has a large operating range and a large cover areas, but it
received a large-amplitude backscatterer echo form the
terrain...
展开
High-frequency(HF) skywave over-the-horizon
radar(OTHR) looks down its targets from the ionosphere, it
has a large operating range and a large cover areas, but it
received a large-amplitude backscatterer echo form the
terrain and sea, and strong interference, such as, radio
frequency interference, industrial interference, impulsive
noise, lightning impulsive, meteor trail echoes and so on.
Interference can be divided into long time interference and
transient interference, transient interference lasts a short
time, but its intensity is great. This paper first discusses the
character of transient interference, and uses eigen-
decomposition to separate the sea clutter subspace and
filter it, or filters terrestrial clutter in frequency domain and
back to time domain, then the transient interference is
detected, after that the transient interference are excised
from the original echoes, finally, the excised clutter and
target echoes are predicted by Burg linear prediction
algorithm. This processing method has been successfully
applied to the real data from China experimental OTHR.
收起
摘要 :
In this paper the distributed source model of first-order scatter from ocean currents is put forward, which can describe the distributed characteristics of ocean currents effectively and be used to evaluate the spatial spectrum es...
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In this paper the distributed source model of first-order scatter from ocean currents is put forward, which can describe the distributed characteristics of ocean currents effectively and be used to evaluate the spatial spectrum estimation techniques under different conditions. Then the numerical simulation of the first-order scatter is carried out using this model. The performance of the MUSIC and the generalized MUSIC algorithms is investigated with the simulated data and the influence of the amplitude-phase error of the channel is evaluated simultaneously. The results show that the distributed source model presented in this paper provides an effective way to model the first-order scatter from ocean currents.
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