| US 7,570,199 B2 | ||
| Device and method for detecting overlap of pulse signals and apparatus for estimating distance using the same | ||
| Sang Yub Lee, Gyunggi-Do (Korea, Republic of); Chang Soo Yang, Gyunggi-Do (Korea, Republic of); Min Kyoung Kwon, Seoul (Korea, Republic of); and Seung Heon Han, Seoul (Korea, Republic of) | ||
| Assigned to Samsung Electro-Mechanics Co., Ltd., Suwon, Gyunggi-Do (Korea, Republic of) | ||
| Filed on Oct. 26, 2007, as Appl. No. 11/925,204. | ||
| Claims priority of application No. 10-2006-0108876 (KR), filed on Nov. 06, 2006. | ||
| Prior Publication US 2008/0106461 A1, May 08, 2008 | ||
| Int. Cl. G01S 13/75 (2006.01) | ||
| U.S. Cl. 342—125 [342/118; 342/134] | 11 Claims |
| 8. An apparatus for estimating a distance, the apparatus estimating a distance between first and second wireless communication
devices which communicate wirelessly with each other, the apparatus comprising:
a reference pulse signal generating part generating a reference pulse signal having a first frequency at a point where the
first wireless communication device transmits a distance estimation signal to the second wireless communication device;
a delayed pulse signal generating part generating a delayed pulse signal having a second frequency different from the first
frequency at a point where the first wireless communication device receives a response signal transmitted from the second
wireless communication device in response to the distance estimation signal;
an overlap detection part comprising:
a duty adjustor generating a duty adjusted pulse signal by increasing a duty of the delayed pulse signal;
a pulse signal calculator multiplying the reference pulse signal and the delayed pulse signal by the duty adjusted pulse signal,
respectively, and adding respective results together to output a signal; and
an overlap determiner determining a middle point of a pulse with a greatest width in the signal outputted from the pulse signal
calculator as a point where the reference pulse signal and the delayed pulse signal begin to overlap each other;
a counter part counting a pulse of one of the reference pulse signal and the delayed pulse signal up to the point where the
reference pulse signal and the delayed pulse signal begin to overlap each other; and
a distance calculation part calculating a time from a point of transmitting the distance estimation signal to a point of receiving
the response signal based on the first frequency, the second frequency and a count value of the counter part, and calculating
a distance between the first and second wireless communication devices based on the time.
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