Multipath is not much of a problem in flat rural or suburban country, but in urban areas or near mountains, FM signal reflections that follow multiple paths with different transit times may interfere with one another and coarsen the sound.
Instead, a time-frequency analysis of the multipath effect, caused by GPS signal reflections, is performed.
Using GPS signal reflections to map snow depth "opens a broad range of research, hazard, and practical possibilities," he says.
Meanwhile, the second term corresponds to the sum of signal reflections and are represented by the dotted lines in Figure3.
In shallow water, multipath occurs due to signal reflections from the surface, bottom and any objects in the water.
Even the moderate growth of riometer absorption within the region of radio paths' locations, resulted in loss of multihop modes in the signal reflections from sporadic layers.
In urban scenarios, radar returns consist of a direct path return along with multipath returns from signal reflections off surfaces such as building walls or floors.
Whether the receiver is stationary or not, SS-BSAR with GNSS uses one receiving channel to record the direct signal from the satellite for synchronisation, while another channel collects satellite signal reflections from an observation area for imaging.
Due to the time delay and to the signal reflections, the resulting mixture x t) is a result of a convolution of the source signal s(t) with an unknown filter tensor a = ( a 1 … a K ) where a k is the k-th (k ∈ [1...K]) M × N matrix with filter coefficients and K is the filter length.
Although the speed may seem really high for an urban environment, note that the term "urban canyon" refers not only to places where there are tall buildings, but any other place where there are slopes or even large metallic billboards at both sides of the road that can cause a great deal of signal reflections.
