2 edition of The double threshold radar receiver for reduction of false targets caused by interfering pulses found in the catalog.
|Contributions||Naval Postgraduate School (U.S.)|
|The Physical Object|
|Pagination||1 v, :|
Radar - Radar - Factors affecting radar performance: The performance of a radar system can be judged by the following: (1) the maximum range at which it can see a target of a specified size, (2) the accuracy of its measurement of target location in range and angle, (3) its ability to distinguish one target from another, (4) its ability to detect the desired target echo when masked by large. A second implementation is termed an m-of-n detector and uses more of a logic circuit rather than a device that integrates. Simply stated, the radar examines the output of the threshold device for n pulses. If a DETECT is declared on any m of those n pulses the radar declares a target detection.
A flat target, like a bathroom mirror, forms a virtual image behind it. So the radar station "sees itself" behind the target, twice the distance away. Since in radar the receiver and transmitter are the same station, we can also think of this as the virtual image transmitting to the real station. But most targets . Chapter 2 Radar Detection Detection in the Presence of Noise A simplified block diagram of a radar receiver that employs an envelope detector followed by a threshold decision is shown in Fig. The input signal to the receiver is composed of the radar echo signal and additive zero mean white Gaussian noise, with variance. The input.
What is claimed is: 1. A method for forming a cluster, the method comprising: receiving a plurality of pulses, by a radar receiver; selecting a first pulse of the plurality of pulses as an anchor point; receiving a second pulse, by the radar receiver, the second pulse and the anchor point each having a respective feature vector, each feature vector having a plurality of features; generating at. Consider a radar with a constant interval between pulses; target reflections appear at a relatively constant range related to the flight-time of the pulse. In today's very crowded radio spectrum, there may be many other pulses detected by the receiver, either .
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This paper is a mathematical investiga- tion of one type of radar receiver which discriminates against false target indications. A double threshold radar receiver is found to be capable of controlling the false target interference. The double threshold receiver is shovm to have a slightly lower radar range capability than a normal receiver.
A study which indicates that the double-threshold radar receiver is effective in suppressing false alarms produced by certain types of interfering electronic signals, with a very small sacrifice in target detection capability. Curves of false alarm rate and signal-to-noise ratio required for target detection are calculated for various values of the relevant parameters and for several target fluctuation Cited by: 2.
the "double threshold " radar receiver for reduction of false targets caused ering pulsesAuthor: Isham W. Linder and Appndix I. STUDIES OF TARGET DETECTION BY PULSED RADAR [Marcum, J. and P. Swerling] on *FREE* shipping on qualifying offers. STUDIES OF TARGET DETECTION BY PULSED RADARAuthor: J.
and P. Swerling Marcum. The requirement for radar systems that can detect the presence of targets within background environments that are more complex and less known than thermal noise and maintain a controlled false alarm rate leads to increased emphasis on adaptive threshold automatic detection by: 3.
In practical situations the false alarm probability in double threshold radar detection, sometimes known as binary integration with sliding window detection, is dependent on the nonstationarity. The scope of this paper is to evaluate the performance of the doublethreshold (DT)-CFAR processor for the situation where the radar receiver based its detection on a collection of M-pulses.
FALSE TARGET RADAR IMAGE GENERATOR FOR COUNTERING WIDEBAND IMAGING RADARS 2 signal thereto. The down converter is arranged to process the reference signal and the wide-band chirp signal to produce a signal component I that is in phase and a component Q that is in quadrature with the wideband chirp signaL The phase BACKGROUND OF THE INVENTIONFile Size: KB.
The W*T Radar Receiver. The radar receiver used for the testing was a double superheterodyne receiver with a first IF of MHz and a second IF of 70 MHz. A simplified schematic of the receiver is shown in Figure 1. The receiver has a wide-band front end, consisting of a receiver.
False Alarm Rate A false alarm is “an erroneous radar target detection decision caused by noise or other interfering signals exceeding the detection threshold”. In general, it is an indication of the presence of a radar target when there is no valid target. In most radar detectors, the threshold is set in order to achieve a required probability of false alarm (or equivalently, false alarm rate or time between false alarms).
If the background against which targets are to be detected is constant with time and space, then a fixed threshold level can be chosen that provides a specified probability of. Influence of ordered and weighted analysis windows on detection in a CFAR radar detector to the case where the radar receiver incorporates a post integrator.
In this paper, we propose a novel approach of architecture interfering targets in the analysis windows, or in the case of clutter Size: KB. The most common approach takes advantage of the Doppler effect.
For a sequence of radar pulses the moving target will be at different distance from the radar and the phase of the radar return from the target will be different for successive pulses, while the returns from stationary clutter will arrive at the same phase shift. replicas of the transmitted radar signal to form a large num-ber of RFTs, these false targets may appear at different ranges, velocities, or angles relative to the physical targets (PTs).
An efficient way must be used to eliminate RFTs for the effectiveness of defense system. Differences of characteristics between the real and false targets are.
External noise interference is a critical factor that determines true receiver sensitivity. Fig. shows various sources of noise over a frequency range of 10 kHz up to GHz .Noise sources that are documented in International Telecommunications Union document ITU-R P are atmospheric noise, including noise due to lightning, galactic noise and man-made noise.
Reduction of Radar Cross Section Based on a Metasurface Jie Chen, Qiang Cheng*, Jie Zhao, Di Sha Dong, and Tie Jun Cui Abstract|A metasurface for Radar Cross Section (RCS) reduction is proposed.
The surface is composed of the same type of metamaterial units with diﬁerent geometric dimensions, leading to various. A false alarm is “an erroneous radar target detection decision caused by noise or other interfering signals exceeding the detection threshold”. Target detecting radars make detection decisions using various algorithms, and the threshold mentioned above is the composition of criteria used to determine whether the received signal is actually that of a real target.
Lesson 6. Block 1. STUDY. PLAY. -false targets-electronic radar interference-radar jamming-target fades. During AP (anomalous propagation) the radar beam is. Appearance of clutter on the radar display caused by moisture in the air bending the radar beam.
anomulous propagation. The False Alarm Rate (FAR) is calculated using the following formula: false targets per PRT FAR number of rangecells False alarms are generated when thermal noise exceeds a pre-set threshold level, by the presence of spurious signals (either internal to the radar receiver or from sources external to the radar), or by equipment malfunction.
Radar is an object-detection system which uses radio waves to determine the range, altitude, direction, or speed of objects.
It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and radar dish or antenna transmits pulses of radio waves or microwaves which bounce off any object in their path. where Ntarg is the number of targets, pis the target index, a(p) is the amplitude and ˝ (p) is the round-trip delay of the -th OFDM symbol for p-th target, fc is the carrier frequency, w (t) is the noise and v (t) is the interfering signal.
The signal model in (2) is based on two assumptions, both typical and realistic for OFDM radar: a) the.Measure (ESM) receiver is to receive, measure, deinterleave pulses and then identify alternative threat emitters.
Deinterleaving of radar signals is based on time of arrival (TOA) analysis and the use of the sequential difference (SDIF) histogram method for determining the pulse repetition interval (PRI), which is an important pulse Size: KB.Pulse radar uses pulses of _____ energy to detect a target’s range.
RADIO FREQUENCY TRUE OR FALSE: The operating principles for pulse and continuous wave (CW) radars are exactly the same. FALSE Active radar allows for _____. DETECTION OF GROUND AND AIR TARGETS Continuous wave (CW) radar detects targets by determining _____.
_____. IF THE FREQUENCY OF THE .