Systems and methods for coarse and fine time of flight estimates for precise radio frequency localization in the presence of multiple communication paths

A synchronous system for localization of nodes in a wireless network architecture, comprising:

• a first wireless node having a wireless device with one or more processing units and RF circuitry for transmitting and receiving communications in the wireless network architecture including a first RF signal having a first packet;
• and
• a second wireless node having a wireless device with one or more processing units and RF circuitry to enable bi-directional communications with the first wireless node in the wireless network architecture including a second RF signal having a second packet, wherein the one or more processing units of the first wireless node are configured to execute instructions to determine a coarse time of flight estimate of the first and second packets and a fine time estimate of the time of flight using channel information of the first and second wireless nodes, wherein the first and second wireless nodes have the same reference clock signal.

A method comprising:

• initiating calibration, with processing logic, of at least one component of RF circuitry having a transmit chain and a receive chain of a first node by generating a first loopback calibration signal and passing this first loopback calibration signal through the transmit chain and the receive chain of the first node;
• and
• measuring a first transmit time delay for passing the first loopback calibration signal through the transmit chain and also a first receive time delay for passing the first loopback calibration signal through the receive chain of the first node.