Patent ID: 8270253

Claim:
A system for short range alignment using ultrasonic sensing, including: a first device comprising: three ultrasonic transmitters for each transmitting a first, second and third pulse shaped signal through the air; an electronic circuit for generating driver signals to the three ultrasonic transmitters for generating the first, second and third pulse shaped signal; an user interface that receives user input for assessing short range alignment determination; a communications port for relaying the user input and receiving timing information to control the electronic circuit; and a battery for powering the electronic circuit and associated electronics on the first device a second device comprising: a processor for generating timing information, registering a pointing location of a tip of the first device responsive to the user input, and determining short range alignment from three or more pointing locations of the first device with respect to the second device; a communications interface for transmitting the timing information to the first device that in response transmits the first, second and third pulse shaped signals; three microphones for each receiving the first, second and third pulse shaped signals transmitted through the air; a memory for storing the first, second and third pulse shaped signals to produce a history of pulse shaped signals, a wireless communication interface for wirelessly conveying the positional information and the short range alignment of the three or more pointing locations to a remote system; a battery for powering the processor and associated electronics on the second device, where the pulse shaped signals are a combination of amplitude modulation, frequency modulation, and phase modulation.