UWB DISTANCE MEASUREMENT SYSTEM AND METHOD OF DRIVING THE SAME

• US 20090262010A1
• Filed: 12/27/2008
• Published: 10/22/2009
• Est. Priority Date: 04/22/2008
• Status: Active Grant

• Current Assignee: INHA Industry Partnership Institute
• Original Assignee: INHA Industry Partnership Institute
• Inventors: SUNG, Tae-Kyung, KWAK, Kyung Sup, SHEN, Hanbing
• Granted Patent: US 7,782,248 B2
• Time in Patent Office: Days
• US Class Current: 342/145
• CPC Class Codes: G01S 13/0209 Systems with very large relative bandwidth, i.e. larger than 10 %, e.g. baseband, pulse, carrier-free, ultrawideband
• CPC Class Codes: G01S 13/282 using a frequency modulated carrier wave G01S13/286 takes precedence
• CPC Class Codes: G01S 7/282 Transmitters

Abstract

The present invention relates to a UWB distance measurement system and method of driving the system. The system includes a reception antenna for receiving a signal, which is output from a transmission unit, is reflected from a target and is incident on the reception antenna, a UWB amplifier for amplifying the received signal and generating a first signal, a reference waveform generator for generating a reference waveform which is a reference for analysis of the first signal, a window function generator for generating at least one window function that is applied to the first signal, a correlator for correlating the first signal with the window function output from the window function generator, and generating a second signal which is a revised frequency response of the first signal, and a delay time detector for detecting a delay time component in the second signal.

Claims

1. An Ultra WideBand (UWB) distance measurement system using a linear chirp waveform, comprising:

a reception antenna for receiving a signal, which is output from a transmission unit, is reflected from a target and is incident on the reception antenna;

a UWB amplifier for amplifying the signal received from the reception antenna and generating a first signal;

a reference waveform generator for generating a reference waveform which is a reference for analysis of the first signal;

a window function generator for generating at least one window function that is applied to the first signal on a basis of the reference waveform output from the reference waveform generator;

a correlator for correlating the first signal output from the UWB amplifier with the window function output from the window function generator, and generating a second signal which is a revised frequency response of the first signal; and

a delay time detector for detecting a delay time component in the second signal output from the correlator.

2. The UWB distance measurement system according to claim 1, wherein the window function generator generates any one of a Hanning window function, a Blackman window function and a Bartlett window function.

3. The UWB distance measurement system according to claim 2, wherein any one of the Hanning window function, the Blackman window function and the Bartlett window function is applied to the first signal, thus widening a main lobe of the first signal while reducing a side lobe of the first signal.

4. A method of driving an Ultra WideBand (UWB) distance measurement system for measuring a distance to a target using a linear chirp waveform, comprising:

receiving a signal reflected from a target using a reception antenna;

amplifying the signal received through the reception antenna to a first signal using a UWB amplifier;

generating a reference waveform, which is a reference for analysis of the first signal, using a reference waveform generator;

generating at least one window function using a window function generator;

generating, using a correlator, a second signal, which is a revised frequency response of the first signal, by applying the window function to the first signal on a basis of the reference waveform; and

detecting a time delay component in the second signal.

5. The method according to claim 4, wherein the window function is any one of a Hanning window function, a Blackman window function and a Bartlett window function.

6. The method according to claim 5, wherein any one of the Hanning window function, the Blackman window function and the Bartlett window function is applied to the first signal, thus widening a main lobe of the first signal while reducing a side lobe of the first signal.

7. The method according to claim 6, wherein:

the Hanning window function is represented by the following Equation;

W_hanning(v)=ρ

+(1−

ρ

)cos(2π

v/B), and

the second signal is generated by applying the Hanning window function to the first function.

8. The method according to claim 6, wherein:

the Blackman window function is represented by the following equation;

W_Blackman(v)=0.42+0.5 cos(2π

v/B)+0.08 cos(4π

v/B), and

the second signal is generated by applying the Blackman window function to the first signal.

9. The method according to claim 6, wherein:

the Bartlett window function is represented by the following equation;

$W_{\mathrm{Bartlett}}<br><br>\left(v\right)=\frac{2}{B}<br><br>\left(\frac{B}{2}-<br><br>v-\frac{B}{2}<br><br>\right),\mathrm{and}$

the second signal is generated by applying the Bartlett window function to the first signal.

10. The method according to claim 7, wherein the second signal generated by applying the window function to the first signal is represented by the following equation:

$y_w<br><br>\left(t\right)=\mathrm{\rho <br><br>}<br><br><br><br>y<br><br>\left(t\right)+\frac{1}{2}<br><br>\left(1-\mathrm{\rho <br><br>}\right)<br><br>y<br><br>\left(\mathrm{\tau <br><br>}-\frac{1}{\mathrm{TB}}\right)<br><br>{\mathrm{<br><br>}}^{\frac{\mathrm{<br><br>}<br><br><br><br>2<br><br><br><br>\mathrm{\pi <br><br>}<br><br><br><br>f_0}{B}}+\frac{1}{2}<br><br>\left(1-\mathrm{\rho <br><br>}\right)<br><br>y<br><br>\left(\mathrm{\tau <br><br>}+\frac{1}{\mathrm{TB}}\right)<br><br>{\mathrm{<br><br>}}^{\frac{\mathrm{<br><br>}<br><br><br><br>2<br><br><br><br>\mathrm{\pi <br><br>}<br><br><br><br>f_0}{B}}$

11. The method according to claim 8, wherein the second signal generated by applying the window function to the first signal is represented by the following equation:

$y_w<br><br>\left(t\right)=\mathrm{\rho <br><br>}<br><br><br><br>y<br><br>\left(t\right)+\frac{1}{2}<br><br>\left(1-\mathrm{\rho <br><br>}\right)<br><br>y<br><br>\left(\mathrm{\tau <br><br>}-\frac{1}{\mathrm{TB}}\right)<br><br>{\mathrm{<br><br>}}^{\frac{\mathrm{<br><br>}<br><br><br><br>2<br><br><br><br>\mathrm{\pi <br><br>}<br><br><br><br>f_0}{B}}+\frac{1}{2}<br><br>\left(1-\mathrm{\rho <br><br>}\right)<br><br>y<br><br>\left(\mathrm{\tau <br><br>}+\frac{1}{\mathrm{TB}}\right)<br><br>{\mathrm{<br><br>}}^{\frac{\mathrm{<br><br>}<br><br><br><br>2<br><br><br><br>\mathrm{\pi <br><br>}<br><br><br><br>f_0}{B}}$

12. The method according to claim 9, wherein the second signal generated by applying the window function to the first signal is represented by the following equation:

$y_w<br><br>\left(t\right)=\mathrm{\rho <br><br>}<br><br><br><br>y<br><br>\left(t\right)+\frac{1}{2}<br><br>\left(1-\mathrm{\rho <br><br>}\right)<br><br>y<br><br>\left(\mathrm{\tau <br><br>}-\frac{1}{\mathrm{TB}}\right)<br><br>{\mathrm{<br><br>}}^{\frac{\mathrm{<br><br>}<br><br><br><br>2<br><br><br><br>\mathrm{\pi <br><br>}<br><br><br><br>f_0}{B}}+\frac{1}{2}<br><br>\left(1-\mathrm{\rho <br><br>}\right)<br><br>y<br><br>\left(\mathrm{\tau <br><br>}+\frac{1}{\mathrm{TB}}\right)<br><br>{\mathrm{<br><br>}}^{\frac{\mathrm{<br><br>}<br><br><br><br>2<br><br><br><br>\mathrm{\pi <br><br>}<br><br><br><br>f_0}{B}}$