###### Abstract
Fiber is also resistant to electrical and radio interference. It is also easy to integrate with CCTV systems for remote viewing of the event. Underground sensors, such as the HF400, are placed up to 0.5 m below the ground. Such a system can have two parallel wires (transmitter and receiver) at a certain distance (e.g., 2 m). In this case, the system is invisible (the boundary of the protected area is invisible) and creates a spatial detection zone resistant to accidental damage. The current and most common strategy is to use vision systems for event analysis with automatic detection, tracking, and recognition of objects within the monitored area. The weakest point of such systems is the requirement of permanent concentration and focusing on many TV displays where a specific event may (or has) occurred. Although the issue has been recognized for many years, there are still no fully satisfactory results applicable to the security field [1; 2; 3; 4; 5; 6; 7; 8; 9; 10]. One of the responsibilities of security personnel is to make a decision whether a detected or observed object has permission to access a particular area of the airport or not. The working conditions are tedious and may lead to the omission of critical events or false alarms. An airport employee can be in a restricted area without being aware of the intrusion--which is not a critical event because of the virtual (i.e., not visually represented) boundaries. The disadvantage of such systems is the lack of automatic differentiation between unauthorized and authorized objects. Despite advances in image and facial recognition algorithms, identification must still be performed manually. Another disadvantage is \"serial operation\": only one object can be tracked/identified at a time (by a single camera and operator). In the case of fast surveillance of multiple objects, this requires a multiplication of equipment and operators--and thus costs. The idea of our system which is presented in the following sections is not limited to the airport but can also be applied in military zones or open areas (e.g., parks), e.g., surrounding hospitals for mentally disabled patients. This paper is organized as follows:* The following subchapters in the introduction section present an overview of civil airport protection requirements and current solutions (Section 1.1), the short-range radar system (Section 1.2), and the used positioning system (Section 1.3);
* Section 2 presents the idea of data fusion for object localization and identification with an exemplary simulation in (Section GPS Positioning Simulations);
* Section 3 contains details on the design of the proposed mobile unit (MU) with a radio subsystem design (Section 3.1), GNSS (GPS) subsystem design (Section 3.2), static positioning accuracy measurements (Section 3.2.1), and dynamic positioning accuracy measurements (Section 3.2.2);
* Section 4 provides details on the design of the proposed communication frame with analysis of the round-trip time in (Section Wireless Communication);
* Section 5 presents measurements of the power consumption of the mobile unit (MU);
* The paper concludes with conclusions (Section 6) and acknowledgements.