Harbor fence

A system for protecting an asset that abuts a body of water, the system comprising:

• a flotation component that maintains the system at essentially a surface of the body of water;
• a plurality of sensor elements positioned along the flotation component, wherein the plurality of sensor elements detects an intruder passing through a security perimeter of the system and comprises at least one immersion detector;
• and
• a control unit that sends a command signal to the plurality of sensor elements and that receives a signal when at least one of the plurality of sensor elements detects the intruder passing through the security perimeter, and wherein the control unit provides a security status.

A system for protecting an asset that abuts a body of water, the system comprising:

• a flotation component that maintains the system at essentially a surface of the body of water, the flotation component forming at least a portion of a security perimeter and having a helical configuration;
• a plurality of sensor elements positioned along the flotation component, wherein the plurality of sensor elements detects an intruder breaching the security perimeter of the system;
• and
• a control unit that receives a signal when at least one of the plurality of sensor elements detects the intruder breaching the security perimeter, and wherein the control unit indicates a location of breaching.

A system for protecting an asset that abuts a body of water, the system comprising:

• a flotation component that maintains the system at essentially a surface of the body of water;
• a plurality of sensor elements positioned along the flotation component, wherein the plurality of sensor elements detects an intruder passing through a security perimeter of the system and comprises a receiver module for receiving a target echo comprising sonar reflection signals from a target;
• and
• a control unit that receives a signal when at least one of the plurality of sensor elements detects the intruder passing through the security perimeter, the control unit comprising:
• a detector for determining the presence of a significant reflecting body based on the target echo;
• a sonar sensor module for processing data of the reflecting body;
• and,
• a processor for determining at least one estimator based on the target echo and for determining a target path based on the at least one estimator.