Sensor Systems - Advanced

It should come as no surprise that military and advanced commercial sensor systems far outstrip the capabilities of the standard sensor systems available to the general public in the kinds of commercial vehicles typically used on the Major Routes or Blue Highways.
Sensor are typically divided into Active Electromagnetic Sensors (AESA), Passive Electromagnetic Sensors (PESA), Advanced Multi-mode Sensors, (Multiscanners) and Gravity Detectors (Gravscanners).
Generally speaking AESA and PESA sensors are line of sight sensors which require mounting either in a turret or multiple units with fixed antennas must be installed. Military craft typically have 6 long range fixed array units of each type to ensure total sensor coverage.
Multiscanners and gravscanners are indirect sensors. They do not require line of sight to operate.
Multiscanners have three operational modes. A single multiscanner unit may only be used in one mode at a time. Civilian vessels will often mount a single multiscanner. Military vessels will almost always have multiple multiscanners, to allow operation in all modes simultaneously. Multiscanner may be set to chemscanner, bioscanner or radscanner mode. In chemscanner and bioscanner mode the multiscanner is an active sensor and may be detected by other vessel's radscanners at 10x their operation range. Radscanners are passive detectors. Radscanners may operate in multiple modes simultaneously. Radscanners function as an advanced radar/laser/maser locator. That means they can locate a ship that is using broadband EM communication, electromagnetic, including light or x-ray based weapons, (though highly collimated energy, like lasers will only be detectable by the intended target.) Plasma weapons are extremely easy for a radscanner to detect. A radscanner can also act as an energy scanner, capable of locating the output of a fusion or MHD based power plants. The ability to detect such sources is very dependent on the output of the power plant as well as the range and whether or not the plant is shielded by a force field or emission masking.
Gravscanners are also multi-mode devices. In passive mode a gravscanner can detect artificial gravity and contrgravity fields, such as those developed by an operating B/G engine. Force fields which are not being operated in distortion mode and gravity field weapons, such as gravity rail guns or gravity pulse weapons can be detected. Tractor/pressor beams can also be detected. Gravity emission masking technology is available.
In passive mode a gravscannor can also be used to detect natural gravity fields and the distortions in real space caused by the movement of an object which has mass through those naturally occurring gravitational fields. This means that a gravscanner can determine the bearing and approximate mass and speed of an object. It can also be used as a gravity anomaly detector (GAD) detecting areas where subspace has intruded into real space, such as happens when an hypershunting capable ship enters or leaves subspace.
In subspace a gravscanner can be used to detect the gravity planes which make up subspace topology, detect subspace storms, and intrusions of real space, such as a subspace portal. The gravity manipulation fields of an operating hyperspace drill can also be detected by a gravscanner in GAD mode.
In active mode a gravscanner can operate as a densitometer, a gravitic-imaging sensor which  can be used to map the interior of objects. In active mode a gravscanner is itself detectable to another gravscanner at 10x its own range. A gravscanner cannot penetrate active force fields, including the structural integrity fields of most TLA and B space vessels.