AIRBORNE SONAR SYSTEMS
USQ- 78(B) ACOUSTIC SYSTEM
BRIEFING: The P-3C’s USQ- 78(B) acoustic processor and display system upgrades the sonobuoy receiver to an all-digital
software-defined system, eliminates obsolete and proprietary
components, interfaces with an open-system architecture, and
provides processing and functionality growth for the life of the
aircraft. The USQ-78B is being installed in all P-3C AIP and
Block Modification Upgrade Program aircraft.
The Acoustic Receiver Technical Refresh (ARTR) program is
designed to provide replacement hardware and software for the
current P-3C acoustic suite that has components nearing the
end of their useful lives. Additionally, ARTR is designed to add
some Radio Frequency Interference mitigation techniques along
with an embedded sonobuoy recording capability. Major components replaced by the ARTR are the Advanced Sonobuoy
Communication Link (ASCL) receivers, ASCL pre-amps,
acoustic distribution boxes, Command Active Sonobuoy System
transmitter, acoustic data recorder(s), Time Code Generator and
Acoustic Test Signal Generator. New hardware consists of a
Software Defined Sonobuoy Receiver (SDSR), Command
Function Transmitter, Quad External Preamplifier, Embedded
Acoustic Data Recorder and an SDSR 4 antenna array.
CONTRACTOR: ...........Lockheed Martin Corp.
BRIEFING: Sonobuoys are used for environmental measurement and prediction prior to and during an ASW operation, passive and active acoustic search and localization of the submarine
target, and final active acoustic fixing of the target position.
Sonobuoys are expendable sensor systems designed to be
dropped from aircraft into the water, where the parachute-retarded or speed-braked cylindrical housings deploy battery-powered cables with passive acoustic hydrophones or active
transducers for detecting, tracking and collecting acoustic intelligence on submarines and surface ships and radioing the information to the aircraft or a ship for processing.
The SSQ- 36 bathythermograph sonobuoy is used to graph
the temperature profile of a body of water. The SSQ-53F
Directional Frequency Analysis and Recording System is a passive acoustic sensor for detecting, localizing and tracking a submarine. The SSQ-77C Vertical Line Array is a passive directional buoy with multiple hydrophones in a vertical column and can
be used as a multistatic receiver or a passive sensor. The SSQ-
62E Directional Command Activated Sonobuoy System is an
active sensor used to provide terminal positioning data during
the attack phase by transmitting active sound and determining
range and bearing to a contact.
The SSQ-101 Air Deployable Active Receiver is a commandable, passive acoustic sonobuoy with a horizontal planar array.
The SSQ- 125 is the coherent source sonobuoy used in the
Multistatic Active Coherent (MAC) Air ASW system. It replaces
the SSQ- 110 used with previous impulsive multistatic systems.
The SSQ- 125 produces electronic (coherent) pulses of vari-
ous types and lengths that enable Doppler processing to distin-
guish moving targets (e.g., submarines) from stationary features
of the environment (e.g., shipwrecks). This capability will
enable the detection of targets in shallow water environments
involving a rough ocean floor. In a planned second phase of
MAC development, the power source for the SSQ- 125 will be
increased, enabling it to attain the long-range search capabilities
required for deep convergence zone environments. High-
altitude ASW will integrate modified sonobuoy sensors to
enhance the P-8A capability to conduct its mission at altitudes
higher than traditional fixed-wing airborne ASW, thereby
enabling greater communications range.
CONTRACTORS:.........Sparton Corp., Ultra Electronics’ UnderSea
Sensor Systems Inc., ERAPSCO (joint venture
between Sparton and Ultra)
UNMANNED UNDERSEA SYSTEMS
ADVANCED DEVELOPMENT UUV
BRIEFING: As a risk-reduction effort for the torpedo-tube-launched 21-inch MRUUVs (Mission Reconfigurable
Unmanned Underwater Vehicles), the Navy awarded Lockheed
Martin Maritime Systems & Sensors a contract in 2003 to
design a single prototype ADUUV. It is the first Navy UUV
designed to accommodate interchangeable modular mission
payloads that can be swapped out at sea. The single prototype
will be used as a test bed for future UUV payloads.
CONTRACTOR: ...........Lockheed Martin Corp.
LARGE-DISPLACEMENT UUV (LDUUV)
BRIEFING: The planned LDUUV is designed to take full
advantage of the 88-inch-diameter, 40-foot-long vertical launch
tubes of the four Trident ballistic-missile submarines the Navy
is converting into guided-missile attack subs. The LDUUV will
have a diameter of more than 3 feet. It will offer far greater
range and payload than the 21-inch MRUUV and, with ample
room for batteries, could potentially operate autonomously for
several weeks. The LDUUV would carry a variety of sensor and
SONOBUOYS ABOARD A P-3C ORION