Patent ID: 8279898
Filing Date: 2012-10-02
Classification: G01S

Abstract:
1. A computer-implemented method for measuring distance based on packets transmitted and received between a first node and a second node, comprising: obtaining first timing for transmitting a first packet from the first node; obtaining second timing for receiving the first packet in the second node; obtaining third timing for transmitting a second packet corresponding to the first packet from the second node; obtaining fourth timing for receiving the second packet in the first node; obtaining fifth timing for transmitting a third packet from the second node; obtaining sixth timing for receiving the third packet in the first node; estimating a clock frequency offset based on the obtained timings; measuring a first distance based on the clock frequency offset and timings for transmitting and receiving the first packet and the second packet; measuring a second distance based on the clock frequency offset and timings for transmitting and receiving the first packet and the third packet; and measuring by a micro-processor a distance between the first node and the second node based on the first distance and the second distance.