Ultra-wideband ranging method and system using narrowband interference supression waveform

1. An Ultra-WideBand (UWB) ranging method using a narrowband interference suppression waveform, comprising:

a first step of transmitting a transmission signal to a target object;

a second step of receiving the transmission signal reflected from the target object;

a third step of generating a template signal by combining the narrowband interference suppression waveform and a channel estimation signal together;

a fourth step of generating a correlation output signal by convoluting the template signal and the signal received at the second step; and

a fifth step of calculating a distance using a time delay when the correlation output signal has a maximum value thereof;

wherein the narrowband interference suppression waveform is any one of two waveforms that are expressed by the following Equation:

w r1 ( t )= g ( t−δ 1 /2)+ g ( t+δ 1 /2)

w r2 ( t )= g ( t−δ 2 /2)− g ( t+δ 2 /2)

where g(t) is a basic UWB pulse waveform, δ 1 =(N+1/2)f 1 , δ 2 =(N)f 1 , N is an integer, and f i is a center frequency of a narrowband interference signal.

2. The UWB ranging method as set forth in claim 1 , wherein the basic UWB pulse waveform is a Gaussian pulse waveform.

3. The UWB ranging method as set forth in claim 1 , wherein the narrowband interference signal of the signal received at the second step is expressed by the following Equation:

i ( t )=β cos(2π f i t +φ)

where i(t) is the narrowband interference signal, f i is the center frequency of the narrowband interference signal, β is a magnitude of the narrowband interference signal, and φ is a phase of the narrowband interference signal.

4. The UWB ranging method as set forth in claim 1 , wherein the first step comprises:

a first process of generating a time clock having a Pseudorandom Noise (PN) code;

a second process of generating a transmission modulation waveform, and combining the transmission modulation waveform with the time clock, thereby generating the transmission signal; and

a third process of transmitting the transmission signal to the target object.

5. The UWB ranging method as set forth in claim 4 , wherein the transmission modulation waveform is a Gaussian pulse waveform.

6. The UWB ranging method as set forth in claim 4 , wherein the channel estimation signal is a signal in which the time clock having the PN code and the channel impulse response signal are convoluted.

7. The UWB ranging method as set forth in claim 1 , wherein the distance to the target object at the fifth step is calculated using the following Equation:

d

=

c

l

⁢

τ

e

2

where d is the distance to the target object, c l , is a wireless transmission speed, and τ e is a time delay when the correlation output signal has a maximum value thereof.

8. A UWB ranging system using a narrowband interference suppression waveform comprising:

a reception antenna for receiving a signal reflected from a target object;

a channel estimation module for estimating a channel impulse response and outputting a channel estimation signal;

a reference waveform generator for generating a narrowband interference suppression waveform; and

a distance calculation module for calculating a distance to the target object using a correlation output signal in which a template signal, in which the channel estimation signal and the narrowband interference suppression waveform are combined together, and the received signal are convoluted;

wherein the narrowband interference suppression waveform is any one of two waveforms expressed by the following Equation:

w r1 ( t )= g ( t−δ 1 /2)+ g ( t+δ 1 /2)

w r2 ( t )= g ( t−δ 2 /2)− g ( t+δ 2 /2)

where g(t) is a basic UWB pulse waveform, δ 1 =(N+1/2)f 1 , δ 2 =(N)/f 1 , N is an integer, and f i is a center frequency of a narrowband interference signal.

9. The UWB ranging system as set forth in claim 8 , wherein the basic UWB pulse waveform is a Gaussian pulse waveform.

10. The UWB ranging system as set forth in claim 8 , further comprising:

a system clock module for generating a time clock;

a PN sequence generator for adding a PN code to the time clock;

a transmission waveform generator for generating a transmission modulation waveform; and

a transmission antenna for transmitting a transmission signal in which the time clock and the transmission modulation waveform are combined together.

11. The UWB ranging system as set forth in claim 10 , wherein the transmission modulation waveform is a Gaussian pulse waveform.

12. The UWB ranging system as set forth in claim 10 , wherein the channel estimation signal is a signal in which the time clock having the PN code and the channel impulse response signal are convoluted.

13. The UWB ranging system as set forth in claim 8 , wherein the distance calculation module calculates the distance to the target object using the following Equation:

d

=

C

l

⁢

τ

e

2

where d is the distance to the target object, C l is a wireless transmission speed, and τ e is a time delay when the correlation output signal has a maximum value thereof.