In the method, the claimed device consists of high-frequency receive-emitting antenna 1, low-frequency receiving antenna 2, switch 3, transmitting unit 4, two-channel receiver unit 5, dual-channel digital signal processing unit 6, first threshold distance estimation unit 7, first weighted average...
and sonic measurement. His research led to a series of patents and the development of a commercial product, theFessenden System Fathometer.This simple but vitally important device redefined marine navigation. Fessenden's Fathometer finally allowed mariners to read the water depth in real-time when ...
In the method, the claimed device consists of high-frequency receive-emitting antenna 1, low-frequency receiving antenna 2, switch 3, transmitting unit 4, two-channel receiver unit 5, dual-channel digital signal processing unit 6, first threshold distance estimation unit 7, first weighted average...