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Background Bottle gourd [Lagenaria siceraria (Mol.) Standl.] is an important cucurbit crop worldwide. Archaeological research indicates that bottle gourd was domesticated more than 10,000 years ago, making it one of the earliest plants cultivated by man. In spite of its widespread importance and long history of cultivation almost nothing has been known about the genome of this species thus far. ...
With slow frequency hopping, a propagation phase can be obtained for each frequency that is sent. The propagation phase for any one frequency yields an ambiguous range. In using the phases from a set of frequencies, it is possible to obtain a reliable, unambiguous range. However if the range is changing while the set of phases is being read, the task of determining the range becomes quite difficult...
With slow frequency hopping, a propagation phase can be obtained for each frequency that is sent. The propagation phase for any single frequency yields an ambiguous range. In using the phases from a set of frequencies, it is possible to obtain a reliable, unambiguous range. This paper explains how a set of propagation delays can be used to determine a unique range distance. Multipath is taken as the...
Frequency hopping spread spectrum (FHSS) ranging is a newly developed radio frequency (RF) technique. With slow frequency hopping, a propagation phase can be obtained for each frequency that is sent. However, each phase is corrupted with multipath, which is a major source of error in RF ranging systems. It is imperative to mitigate this effect for the purpose of achieving the highest-level of accuracy...
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