Systems and methods for synchronous detection of signals
AssigneeAdmiralty Corporation
InventorJames Wagner Larsen
Life of this patent
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Abstract
Systems and processes for synchronous demodulation of signals in detection contexts in order to improve frequency, magnitude and/or phase response over pulsed signal methods. According to a preferred embodiment, a return signal is demodulated for the time corresponding to when its corresponding transmitting signal has been discontinued or has fallen below a certain level. Multiple transmission frequencies, transmitters, and or sensors, among other things, may be used.
Claims22
A method for synchronous detection of a pulsed signal in a transmit-receive detection system comprising:
- transmitting at least one transmitted signal, said signal having a frequency, continuously for a period of time;
- receiving a return signal on at least one sensor, said return signal corresponding to said transmitted signal;
- synchronously demodulating said return signal to calculate the relative magnitudes and phases between said at least one return signal and said at least one transmitted signal;
- ceasing to transmit said transmitted signal;
- after ceasing to transmit said transmitted signal, continuing to demodulate said return signal whereby a timing relationship with said at least one transmitted signal is maintained.
A method of synchronous detection of a pulsed signal in a transmit-receive detection system comprising:
- transmitting, continuously for a period of time, a plurality of transmitted signals, at least some of said signals including a frequency different from a frequency in other of said signals;
- receiving a plurality of return signals on at least one sensor, said return signals corresponding to said transmitted signals;
- synchronously demodulating said return signals to calculate the relative magnitudes and phases between said return signals and said transmitted signals;
- ceasing to transmit at least some of said transmitted signals;
- after ceasing to transmit said at least some of said transmitted signals, continuing to demodulate said return signals whereby a timing relationship with said transmitted signals is maintained.
A method of synchronous detection of a pulsed signal in a transmit-receive detection system comprising:
- transmitting, continuously for a period of time, a plurality of transmitted signals, at least some of said signals including a frequency different from a frequency in other of said signals, said transmitting performed using a plurality of transmitters;
- receiving a plurality of return signals on a plurality of sensors, said return signals corresponding to said transmitted signals;
- synchronously demodulating said return signals to calculate the relative magnitudes and phases between said return signals and said transmitted signals;
- ceasing to transmit at least some of said transmitted signals;
- after ceasing to transmit said at least some of said transmitted signals, continuing to demodulate said return signals whereby a timing relationship with said transmitted signals is maintained.
Dependencies are inferred from the claim text.