System and method for auto detecting travel direction of authorized users through an access point of a security system

A security system of a facility having a door, wherein the security system has an armed state and a disarmed state, the security system comprising:

• a device positioned adjacent the door, wherein the device includes a first antenna and a second antenna separated by a ground plane, the device is configured to:
• detect that a wireless credential of an authorized user of the facility ingresses in through the door when the first antenna receives wireless signals from the wireless credential while the second antenna is substantially blocked from receiving wireless signals from the wireless credential by the ground plane, followed by the first antenna being substantially blocked from receiving wireless signals from the wireless credential by the ground plane while the second antenna receives wireless signals from the wireless credential;
• detect that the wireless credential of the authorized user of the facility egresses out through the door when the second antenna receives wireless signals from the wireless credential while the first antenna is substantially blocked from receiving wireless signals from the wireless credential by the ground plane, followed by the second antenna being substantially blocked from receiving wireless signals from the wireless credential by the ground plane while the first antenna receives wireless signals from the wireless credential;
• and
• a security system controller operatively coupled to the device, wherein the security system controller, in response to the device detecting an ingress of the authorized user through the door, automatically set the security system to the disarmed state.

A non-transitory computer readable medium storing instructions that when executed by one or more processors of a security system causes the one or more processors to:

• detect ingress into a facility by each of a plurality of authorized users when a first antenna receives wireless signals from a wireless credential of a respective authorized user while a second antenna is substantially blocked from receiving wireless signals from the wireless credential of the respective authorized user by a ground plane, followed by the first antenna being substantially blocked from receiving wireless signals from the wireless credential of the respective authorized user by the ground plane while the second antenna receives wireless signals from the wireless credential of the respective authorized user;
• detect egress out of the facility by each of the plurality of authorized users when the second antenna receives wireless signals from the wireless credential of the respective authorized user while the first antenna is substantially blocked from receiving wireless signals from the wireless credential of the respective authorized user by the ground plane, followed by the second antenna being substantially blocked from receiving wireless signals from the wireless credential of the respective authorized user by the ground plane while the first antenna receives wireless signals from the wireless credential of the respective authorized user;
• maintain a count of a number of authorized users that are currently inside of the facility based at least in part on a relative count of a number of ingresses and a number of egresses detected for the plurality of authorized users;
• automatically set the security system to an armed state when the count of the number of authorized users that are currently inside of the facility reaches zero;
• and
• automatically set the security system to a disarmed state when the count of the number of authorized users that are currently inside switches from zero to one.