Surveillance of the areas surrounding the offshore platform is carried out by using:
- detections obtained with the specialized FMCW radar of the SARGOS system, when facing with small crafts, skiffs, specific floating machines (over-motorized dinghies) and regular ships;
- Information collected by sensors associated to SARGOS FMCW radar: conventional navigation radar, IR PTZ camera, AIS system, communication means.
The FMCW radar ensures in particular the localization of detected echoes, their tracking and the calculation of the tracks kinematics, their classification, the transmission of the various attributes of the tracked objects to the preferential radar subscribers (radar technical function, operational station) and data exchange with the “surface situation management” function.
The “surface situation management” function ensures acquisition and association of information needed to establish a closed operational picture, information processing so as to define the “identity class” of the detected echo and to determine the threat according to the three following stages:
- Dangerousness evaluation , based on a crossed analysis of the identity class of the detected mobile and the position of the detected intrusion with regard to the safety perimeter defined around the offshore platform;
- Threat ranking calculation using detected mobile parameters such as distance, speed and route,
- Analysis of the threat characterization parameters in order to assess the need for activating or not a “dangerous intrusion” alert.
The “dangerous intrusion” alert generated by the “surface situation management” function is forwarded to the “reactions determination” function which implements:
- Possible reactions planning calculations according to the level of knowledge acquired on various detected threats (behaviour criteria, identity classes, and comparison of the current real time situation with previous situations met and stored by the system). These calculations take into account possible limitations due to the territorial situation or the legal status of the platform;
- Recommendation for activating reaction means, proposition subjected to the validation of the operating station operator. The role of this operator is to state on the relevance or non-relevance of sending a retort instruction to the “means management” module;
- Activation of an in-house alert broadcasting process;
- Activation of an outside alert broadcasting process using normalized message generation in order to inform onshore authorities about the nature of the intrusion and the corresponding degree of nuisance.
First and foremost, SARGOS addresses the issue of surveillance and protection of civilian infrastructures: the system shouldn’t require dedicated staff devoted to people and goods protection; it has to remain compatible with exploitation by a non-specialized operator having for first objective the daily oil production and being potentially put under stress if confronted to a crisis situation.
To assure a fast and comprehensive apprehension of the situation, SARGOS information are displayed on two adjacent screens:
The first screen shows
- The tactical surface situation displayed on a map enriched with relevant maritime information, detected ships sorted regarding their dangerousness;
- A decision making support presenting the plan of reaction elaborated using reaction modeling approaches.
Operating station – Surface situation management screen
The second screen is reserved for video camera imaging in order to allow threat identification. It is divided into 3 areas:
- the banner is used to display either the current panoramic view of the scene, or an historical background allowing to show to the operator pictures captured before he arrived;
- a close view focused on the detected threat, so as to enable the operator to validate the class of craft and the threat identity class;
- a close IR view complementing the day vision to improve threat identification.
Operating station – Identification screen
SARGOS proposes an automated process to analyze situations, to set off alerts and to elaborate plans with progressive and reversible reactions to be implemented. The system brings three phases into play:
Stage 1 : Automatic surveillance
At first, the system is stand . SARGOS monitors the surface situation with tracks provided by various sensors, and estimates the dangerousness of each craft navigating near the platform. When the level of dangerousness reaches a threshold, the system leaves the “Automatic surveillance” phase to enter the “Alert” phase.
Stage 2 : Alert
One of the system tracks reaches a level of dangerousness above the alert threshold: the operator assessment is required. An alarm is generated so as to warn the operator about the detected risk. The system video cameras are turned toward the threat in order to propose visual identification means
Stage 3 : Processing
The system enters the “reactions processing”
The operator has been acquainted with the situation, he has confirmed and identified the threat. The system enters the reactions processing phase. The system proposes to the operator a reaction plan based on the threat nature and on the time required to carry on these reactions.