The radar ambiguity function is defined as
the absolute value of the envelope of the output of a matched filter when the input to the filter is a Doppler-shifted version of the original signal
, to which the filter was matched. Ambiguity functions are usually analyzed on a single pulse basis.
What is radar ambiguity?
The radar ambiguity function is defined as
the absolute value of the envelope of the output of a matched filter when the input to the filter is a Doppler-shifted version of the original signal
, to which the filter was matched. Ambiguity functions are usually analyzed on a single pulse basis.
What is range ambiguity ultrasound?
Range-ambiguity artifacts (RAAs) are
an erroneous mapping of returning echoes into a composite picture
. … This phenomenon is actually a combination of two phenomena: a ring-down artifact and RAA. This form is referred to as “complex RAA (searchlight phenomenon)” in this review.
What causes range ambiguity?
When
the radar platform is moving with respect to the ground
, however, there is a spread of the clutter spectrum, and radar repetition frequency F
R
needs to be increased in order to discriminate desired echoes from clutter by Doppler filtering. This increase gives rise to range ambiguities.
What is unambiguous range of radar?
The unambiguous range of a radar is
the maximum range at which a target can be located so as to guarantee that the reflected signal/pulse from that target corresponds to the most recent transmitted pulse
. The radar range is measured by the time delay between pulse transmission and reception.
How do you resolve range ambiguity?
Range ambiguity resolution is a technique used
with medium Pulse repetition frequency (PRF) radar
to obtain range information for distances that exceed the distance between transmit pulses. This signal processing technique is required with pulse-Doppler radar.
What do u mean by ambiguity?
Full Definition of ambiguity
1a :
the quality or state of being ambiguous especially in
meaning The ambiguity of the poem allows several interpretations. b : a word or expression that can be understood in two or more possible ways : an ambiguous word or expression. 2 : uncertainty.
What is range resolution in ultrasound?
The range spatial resolution is an important factor determining the image quality in ultrasonic imaging. The range spatial resolution in ultrasonic imaging depends on
the ultrasonic pulse length
, which is determined by the mechanical response of the piezoelectric element in an ultrasonic probe.
What is the maximum unambiguous range?
The maximum range from which a transmitted radar, lidar, or sodar pulse can be reflected and received before the next pulse is transmitted. This range, r
max
, is given by
r
max
= cT/2
, where T is the interpulse period and c is the speed of light (or speed of sound in the case of sodar).
What is the advantage of high PRF mode?
An advantage of a high-prf pulse doppler radar is
that it can readily detect targets with a high relative-velocity since such echoes do not compete
with the echoes from clutter that are at lower doppler frequencies.
What determines the range resolution in radar?
Range resolution is the ability of a radar system to distinguish between two or more targets on the same bearing but at different ranges. The degree of range resolution depends on
the width of the transmitted pulse, the types and sizes of targets, and the efficiency of the receiver and indicator
.
What is blind speed in radar?
The radar blind speed is
the speed at which the target will not be visible to the radar
. This speed can be calculated based on the frequency/wavelength of the wave and the Pulse Repetition Time.
What is range in radar?
Range is
the distance from the radar site to the target measured along the line of sight
. (3) The factor of two in the equation comes from the observation that the radar pulse must travel to the target and back before detection, or twice the range.
What is the minimum range of radar?
The minimum range capability of a radar is determined primarily by the pulse length. It is equal to half the pulse length of the radar (
164 yards per microsecond of pulse length
).
What is the maximum range of radar?
Therefore, the maximum range of Radar for given specifications is
158KM
.
What is the basic principle of radar?
The basic principle behind radar is simple
– extremely short bursts of radio energy (traveling at the speed of light) are transmitted, reflected off a target and then returned as an echo
. Radar makes use of a phenomenon we have all observed, that of the ECHO PRINCIPLE.
