Coarse and fine compensation for frequency error

An apparatus comprising:

• a transmitter including a radio frequency (RF) domain and a digital domain configured to transmit initiating ranging signals to a target device;
• a receiver configured to receive reflecting ranging signals from the target device;
• and
• a processor configured to:
• determine a target frequency of a target channel used for transmitting a ranging signal to the target device, wherein the target frequency compensates for a frequency systematic known error (FSKE) associated with the target channel of the apparatus;
• wherein the transmitter is configured to:
• generate the target frequency of the ranging signal by shifting a first signal with a coarse frequency offset in the RF domain;
• and
• generate the first signal by shifting the ranging signal with a fine frequency offset in the digital domain, wherein the coarse frequency offset combines with the fine frequency offset to compensate the target frequency for the FSKE.

A system comprising:

• a host device;
• an antenna;
• a ranging device configured to exchange ranging signals with a target device, the ranging device includes;
• a transmitter including a radio frequency (RF) domain and a digital domain configured to transmit initiating ranging signals to the target device through the antenna;
• a receiver configured to receive reflecting ranging signals from the target device through the antenna;
• and
• a processor configured to:
• determine a target frequency of a target channel used for transmitting a ranging signal to the target device, wherein the target frequency compensates for a frequency systematic known error (FSKE) associated with the target channel of the ranging device;
• wherein the transmitter is configured to:
• generate the target frequency of the ranging signal by shifting a first signal with a coarse frequency offset in the RF domain;
• and
• generate the first signal by shifting the ranging signal with a fine frequency offset in the digital domain, wherein the coarse frequency offset combines with the fine frequency offset to compensate the target frequency for the FSKE.