UWB delay and multiply receiver
An ultra-wideband (UWB) delay and multiply receiver is formed of a receive antenna; a variable gain attenuator connected to the receive antenna; a signal splitter connected to the variable gain attenuator; a multiplier having one input connected to an undelayed signal from the signal splitter and another input connected to a delayed signal from the signal splitter, the delay between the splitter signals being equal to the spacing between pulses from a transmitter whose pulses are being received by the receive antenna; a peak detection circuit connected to the output of the multiplier and connected to the variable gain attenuator to control the variable gain attenuator to maintain a constant amplitude output from the multiplier; and a digital output circuit connected to the output of the multiplier.
1. An ultra-wideband (UWB) delay and multiply receiver, comprising:
a receive antenna;
a variable gain attenuator connected to the receive antenna;
a signal splitter connected to the variable gain attenuator;
a multiplier having one input connected to an undelayed signal from the signal splitter and another input connected to a delayed signal from the signal splitter, the delay between the splitter signals being equal to the spacing between pulses from a transmitter whose pulses are being received by the receive antenna;
a peak detection circuit connected to the output of the multiplier and connected to the variable gain attenuator to control the variable gain attenuator to maintain a constant amplitude output from the multiplier; and
a digital output circuit connected to the output of the multiplier.
2. The receiver of claim 1 , wherein the antenna is a UWB antenna or a narrowband antenna.
3. The receiver of claim 1 , further comprising an amplifier and a band pass filter between the antenna and the variable gain attenuator.
4. The receiver of claim 3 , further comprising an amplifier and a band pass filter between the variable gain attenuator and the signal splitter.
5. The receiver of claim 1 , wherein the multiplier is a RF analog multiplier.
6. The receiver of claim 1 , further comprising a delay line connected between the signal splitter and one input of the multiplier to produce the delayed signal.
7. The receiver of claim 6 , wherein the delay line is a coaxial cable.
8. A method, comprising:
providing an ultra-wideband (UWB) delay and multiply receiver, comprising:
a receive antenna;
a variable gain attenuator connected to the receive antenna;
a signal splitter connected to the variable gain attenuator;
a multiplier having one input connected to an undelayed signal from the signal splitter and another input connected to a delayed signal from the signal splitter, the delay between the splitter signals being equal to the spacing between pulses from a transmitter whose pulses are being received by the receive antenna;
a peak detection circuit connected to the output of the multiplier and connected to the variable gain attenuator to control the variable gain attenuator to maintain a constant amplitude output from the multiplier; and
a digital output circuit connected to the output of the multiplier;
producing the undelayed signal from the signal splitter;
producing a delayed signal from the signal splitter;
maintaining a constant amplitude output from the multiplier by controlling the variable gain attenuator of the peak detection circuit; and
digitizing the output from the multiplier with the digital output circuit.
9. The method of claim 8 , wherein the antenna is a UWB antenna or a narrowband antenna.
10. The method of claim 8 , further comprising an amplifier and a band pass filter between the antenna and the variable gain attenuator.
11. The method of claim 8 , further comprising an amplifier and a band pass filter between the variable gain attenuator and the signal splitter.
12. The method of claim 8 , wherein the multiplier is a RF analog multiplier.
13. The method of claim 8 , further comprising a delay line connected between the signal splitter and one input of the multiplier to produce the delayed signal.
14. The method of claim 13 , wherein the delay line is a coaxial cable.
15. A method, comprising:
passing an RF signal through a variable gain attenuator of an ultra-wideband (UWB) delay and multiply receiver to a signal splitter of said UWB delay and multiply receiver;
producing an undelayed signal from the signal splitter of ultra-wideband (UWB) delay and multiply receiver;
producing a delayed signal from the signal splitter;
inputting the undelayed signal and the delayed signal into two inputs of a multiplier of said UWB delay and multiply receiver;
maintaining a constant amplitude output from the multiplier of said UWB delay and multiply receiver by controlling the variable gain attenuator by a peak detection circuit of said UWB delay and multiply receiver, the peak detection circuit being connected to the output of the multiplier and to the variable gain attenuator; and
digitizing the output from the multiplier with a digital output circuit.
16. The method of claim 15 , wherein said UWB delay and multiply receiver comprises a receive antenna selected from the group consisting of an UWB antenna and a narrowband antenna.
17. The method of claim 15 , further comprising providing an amplifier and a band pass filter between the antenna and the variable gain attenuator.
18. The method of claim 15 , further comprising providing an amplifier and a band pass filter between the variable gain attenuator and the signal splitter.
19. The method of claim 15 , wherein the multiplier is a RF analog multiplier.
20. The method of claim 15 , further comprising providing a delay line connected between the signal splitter and one input of the multiplier to produce the delayed signal.