Multi-sensor passive keyless functionality

A method of automatic passive action operation, the method comprising steps of:

• obtaining received signal strength indications (RSSIs) of transmissions by a processor of a mobile device from a relatively-short range radio frequency (RF) transceiver of the mobile device that receives the transmissions, the transmissions being transmitted by an asset-installed system, the asset-installed system being installed in a vehicle;
• obtaining one or more movement-related indications that are different than the RSSIs by the processor from one or more movement sensors of the mobile device, the movement-related indications indicating movement or lack of movement of the mobile device;
• obtaining estimates of distance between the mobile device and the vehicle, thereby acquiring a time series of estimates of distance, the time series of estimates of distance comprising a previous estimate and a current estimate, the current estimate being later in the time series than the previous estimate, the step of obtaining the previous estimate and the current estimate being performed by the processor;
• selecting by the processor a selected distance estimate from the current estimate and the previous estimate based on the one or more movement-related indications;
• and
• notifying automatically the asset-installed system of a predetermined distance condition being met by the selected distance estimate in response to the predetermined distance condition being met by the selected distance estimate.