초록 ▼

A first device (100) transmits a first signal to a second device (300) at a first time. A third device (110) detects a second signal from the second device (300) at a second time. The second signal was transmitted in response to detection of the first signal. Based on the first and second times, a s

A first device (100) transmits a first signal to a second device (300) at a first time. A third device (110) detects a second signal from the second device (300) at a second time. The second signal was transmitted in response to detection of the first signal. Based on the first and second times, a sum of a first propagation delay (200) and a second propagation delay (210) is estimated. The first propagation delay (200) is between the first device (100) and the second device (300), and the second propagation delay (210) is between the second device (300) and the third device (110). The sum of the first and second propagation delays (200, 210) is then used to estimate a location of the second device (300).

대표청구항 ▼

A first device (100) transmits a first signal to a second device (300) at a first time. A third device (110) detects a second signal from the second device (300) at a second time. The second signal was transmitted in response to detection of the first signal. Based on the first and second times, a s

A first device (100) transmits a first signal to a second device (300) at a first time. A third device (110) detects a second signal from the second device (300) at a second time. The second signal was transmitted in response to detection of the first signal. Based on the first and second times, a sum of a first propagation delay (200) and a second propagation delay (210) is estimated. The first propagation delay (200) is between the first device (100) and the second device (300), and the second propagation delay (210) is between the second device (300) and the third device (110). The sum of the first and second propagation delays (200, 210) is then used to estimate a location of the second device (300). allowable range, or moves around a predetermined range; and game process means for performing a game process in response to said generated game event. 2. The navigation apparatus as set forth in claim 1, wherein said position acquisition means acquires said positional information by utilizing a global positioning system. 3. The navigation apparatus as set forth in claim 1, wherein said game process means sets a quiz in response to said generated game event, and performs a game-points process, based on an answer to said quiz. 4. The navigation apparatus as set forth in claim 2, wherein said game process means sets a quiz in response to said generated game event, and performs a game-points process, based on an answer to said quiz. 5. The navigation apparatus as set forth in claim 3, wherein said quiz has contents related to said target spot. 6. The navigation apparatus as set forth in claim 1, wherein said map hold means holds a virtual map including virtual geographical features and natural features on the earth.