echo signal

echo signal

[′ek·ō ‚sig·nəl]
(electromagnetism)

echo signal

The radar energy returned to a radar by a target. The amount of this energy is called received power. Also called a video signal or a target signal.
References in periodicals archive ?
If the echo signal sampling rate doesn't satisfy the Nyquist rate, these conventional methods will suffer from image degradation and artifacts.
Considering the movement of the radar platform along azimuth direction, the raw echo signal is written as
Most of the published imaging algorithms suppose the echo signal without carrier frequency and be digitized directly, and take no consideration of A/D sampling rate limitation, echo data voxel volume and flying platform motion effect during the time-divided transmitting-receiving procedure.
The compressibility of the echo signal in azimuth time domain was investigated, to make the echo signal sparse in Fourier domain via sparse processing.
LASAR obtains range resolution by pulse compression of chirp echo signal and receives azimuth and cross-track (CT) dimensional resolution from a 2-D virtual aperture which is formed by a linear array antenna (LAA) movement perpendicular to flight direction.
Radar, an acronym for radio detection and ranging, is an object detection system which fires electromagnetic wave into the surrounding environment, then receives and processes its echo signal reflected, so as to determine the range, range rate and angle of objects.
Compared with ambient noise and reverberation has its unique characteristics, one of the most important, the reverberation is caused by the emission signal, and has close relation with the environment, and the waveguide, therefore spectral properties of the reverberation and the target echo signal under the condition of the Doppler frequency shift is correlation is very strong, and present a strong non-stationarity.
But if one of the materials is air or another gas, virtually 100% of the pulse is reflected as an echo signal.
If the power of echo signal after Kalman filtering is greater than the threshold, then the radar system detects the presence of target, otherwise not.
Therefore, the most commonly used technologies for measuring the position of an object involve sending energy towards the object to be measured, collecting the echo signal, and analyzing this echo signal to determine the position of one or several objects located in the sensor's field of view.
The fault distance is measured, the defects of the optical time domain reflection technology is overcome and fault detection in high spatial resolution achieved that is independent of distance measurement can be achieved by the cross-correlation operation of the reference signal and probe light echo signal [3].