EXPERIMENTAL ESTIMATE OF NOISE IMMUNITY FOR THE SHORT-RANGE NOISE PULSE RADAR SUBJECTED TO THE ACTION OF CONTINUOUS ACTIVE NOISES

In order to solve the contradiction of pulse radar detection range and range resolution, the LFM signal which has a large time-bandwidth product is chosen to be modulated on the transmitter pulse. So that the radar has larger width and higher range resolution. Since the conversion of the transceiver switches, wide LFM signal may cause close range blind spots. Timeshare launching one long and one short signals is traditional solution, but it will cause a lower data rate. A kind of dual-LFM signal based on frequency division multiplexing is presented, the short pulse is used in short-range to offset the lack of wide LFM signal. Through simulation, it is guaranteed that, by using this kind of signal, the radar has a higher resolution regardless of the target distance, and the short-range blind spot also can be eliminated.

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3 mm pulse radar for short-range navigation and collision avoidance

IEEE Aerospace and Electronic Systems Magazine ◽

10.1109/62.774899 ◽

1999 ◽

Vol 14 (7) ◽

pp. 23-25 ◽

Cited By ~ 2

Author(s):

V.V. Muraviev ◽

A.V. Rubanic ◽

Y.P. Vorobiev ◽

Y.M. Choban ◽

P.V. Fedosuk

Keyword(s):

Collision Avoidance ◽

Short Range ◽

Pulse Radar

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Investigation of Noise Immunity of Ultrawideband Pulse Radar Sensors on the Base of Single Chip

10.1145/3487075.3487105 ◽

2021 ◽

Author(s):

Andrey Borzov ◽

Konstantin Likhoedenko ◽

Grigory Seregin ◽

Victor Suchkov

Keyword(s):

Noise Immunity ◽

Single Chip ◽

Radar Sensors ◽

Pulse Radar

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Synthesis of sequences for short range pulse radar

2018 IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (EIConRus) ◽

10.1109/eiconrus.2018.8317423 ◽

2018 ◽

Author(s):

Ilya A. Kuzmin ◽

Timofey A. Dovgal ◽

Anna I. Maksimovskaya ◽

Vitaly I. Oreshkin ◽

Akim A. Bochkov

Keyword(s):

Short Range ◽

Pulse Radar

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Domain coarsening by grain boundary migration in ordered Ni4Mo

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100144279 ◽

1986 ◽

Vol 44 ◽

pp. 560-561

Author(s):

K. Vasudevan ◽

H. P. Kao ◽

C. R. Brooks ◽

E. E. Stansbury

Keyword(s):

Grain Boundary ◽

Grain Boundaries ◽

Short Range ◽

Boundary Migration ◽

Grain Boundary Migration ◽

Rapid Cooling ◽

Temperature Range ◽

Fee Structure ◽

Domain Coarsening ◽

Boundary Reaction

The Ni4Mo alloy has a short-range ordered fee structure (α) above 868°C, but transforms below this temperature to an ordered bet structure (β) by rearrangement of atoms on the fee lattice. The disordered α, retained by rapid cooling, can be ordered by appropriate aging below 868°C. Initially, very fine β domains in six different but crystallographically related variants form and grow in size on further aging. However, in the temperature range 600-775°C, a coarsening reaction begins at the former α grain boundaries and the alloy also coarsens by this mechanism. The purpose of this paper is to report on TEM observations showing the characteristics of this grain boundary reaction.

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Ordering in Ni4Mo by TEM and APFIM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010012597x ◽

1987 ◽

Vol 45 ◽

pp. 214-215

Author(s):

E.A. Kenik ◽

T.A. Zagula ◽

M.K. Miller ◽

J. Bentley

Keyword(s):

Electron Irradiation ◽

Low Temperatures ◽

Short Range ◽

Atom Probe ◽

Range Order ◽

Considerable Time ◽

Probe Field ◽

Disordered Phase ◽

Transmission Electron ◽

Diffraction Patterns

The state of long-range order (LRO) and short-range order (SRO) in Ni4Mo has been a topic of interest for a considerable time (see Brooks et al.). The SRO is often referred to as 1½0 order from the apparent position of the diffuse maxima in diffraction patterns, which differs from the positions of the LRO (D1a) structure. Various studies have shown that a fully disordered state cannot be retained by quenching, as the atomic arrangements responsible for the 1½0 maxima are present at temperatures above the critical ordering temperature for LRO. Over 20 studies have attempted to identify the atomic arrangements associated with this state of order. A variety of models have been proposed, but no consensus has been reached. It has also been shown that 1 MeV electron irradiation at low temperatures (∼100 K) can produce the disordered phase in Ni4Mo. Transmission electron microscopy (TEM), atom probe field ion microscopy (APFIM), and electron irradiation disordering have been applied in the current study to further the understanding of the ordering processes in Ni4Mo.

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