Extended Range Guided Munitions

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Extended Range GuidedMunition (ERGM) Safe & ArmDevice and Height-of-Burst

SensorRobert HertleinL3 CommunicationsKDI Precision ProductsCincinnati, OH

Mark MinerRaytheon Missile SystemsTucson, AZ

The effort described herein was sponsored by the U. S. Navy under contract N00024-96-C-5204

NDIA Fuze Conference April 9, 2003 New Orleans, LA

Extended Range Guided Munitions

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ERGM Background

• Designated the EX171, ERGM is being developedfor the US Navy (NSWC/WD) by Raytheon

• GPS-Guided Projectile– Long range (15 - 50 nautical miles)– Highly accurate independent of range– Extremely effective against a variety of targets– Designed for use on 5” naval gun systems– Provides effective fire support for operations ashore

Extended Range Guided Munitions

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ERGM CONOPS

MotorBurn

GPSAcquisitionWindow

Data Load Gun LaunchFins DeployBattery On

CanardsDeploy

Establish Glide Slopefor Maximum Range

If GPS Jammed,Inertial Guidance

to Target

Body AngleControl for

Added Lethality

Unitary WarheadWith Height of Burst Sensor

Target

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ERGM Background (continued)

• Formerly DPICM -- Converted to UnitaryWarhead– Near vertical approach angle– Maximum lethality achieved with well-controlled

burst height• Requires accurate, reliable HOB sensor

– KDI designed S&A for DPICM round• Selected by Raytheon to design HOB Sensor and S&A

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Overview

Unitary Payload

Rocket Motor

Height Of Burst(HOB) Sensor

Safe and Arm Device

Flight Battery

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HOB Sensor Design Requirements

• Very Tight HOB Tolerance (10 ± 2 ft)• Approach angle vertical ± 10 °• Packaging Volume

– HOB sensor limited to two pockets in existing casting• Signal processing module• Antenna

• Must Survive all ERGM Environments– Setback acceleration 10,100 g (nominal)– Balloting 2,500 g– -40°F - +145°F storage– +15°F - +146°F operating

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HOB Sensor Packaging

FLIGHTUP

FWD

HOB ANTENNA

GPS ANTENNAHOB ELECTRONICS

CLEARANCE FOR COAX CONNECTOR

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HOB Sensor Electronics

• Directional Doppler Radar (DDR) Proximity Sensor• Based on RF Transceiver MMIC and Signal Processor

ASIC Developed for Multi-option Fuze for Artillery(MOFA)– Performance well characterized– ECM resistant– Low risk

• Packaged to fit within available volume

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HOB Functional Block Diagram

Antenna

Coaxial CableTransceiverSignal Processor

Modulation

I.F.

SystemClock

OptocouplerVoltage

Regulator

Enable

+5VDC

Battery +

Enable

PCU Ground

Battery Ground

Fire Return

FireCommand

Electronics Module

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HOB Sensor Electronics Module

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HOB Antenna

• Electrical Design Requirements– Forward looking pattern with side-mounted antenna– Wide bandwidth– Gun rugged

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HOB Antenna

• Raytheon design• Meets requirements with margin

Projectile

axis

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HOB Antenna Radiation Pattern

Nose Forward

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Safe & Arm Device

• Electromechanical– Command-to-Arm– Setback is First Environment

• 3 G-Leaf Setback Sensor

– Second Environment – spin switch– FPGA-Based Logic– Serial Communication with Mission Computer

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S&A Key Performance Requirements

• Topic Value– Setback (proof) 12,000 g– Setforward 2,500 g – Ballotting 2,500 g– Power Supplied 14.25 - 15.75V – Weight Elec. Assy. (Total 1 Lb. )– Weight Mech. Assy. (Total 1 Lb.)

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Setback Mechanism

Detent

Piston Actuator

Second lock due to interference betweenthe rotor lock spring and rotor

Setback loadsupporting shelf

First lock due to interference betweenthe rotor lock shaft and rotor

Rotor Lock Shaft Rotor

S&A Internal Arrangement -Mechanical Details

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Explosive Output (aft face)

Connector toElectrical S&A Alignment Pin

Fastener Holes

S&A External Interface IllustrationMechanical Assembly

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S&A Integration

FLIGHTBATTERY

FUZE CUPASSEMBLY

S&AELECTRONICS

BULLSEYECONNECTOR

ALIGNMENTRING

LOWERELECTRONICSSUPPORT

UPPERELECTRONICSSUPPORT

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S&A/HOB Functional Block Diagram

S&AMechanism/

ExplosiveTrain

S&AInterface

Electronics

MissionComputer

GEUPre-Launch

MissionData

HOB SensorBattery

PowerConditioning

Unit

Power

Enable

SerialData

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Design Status

• HOB Sensor– Lab testing shows excellent performance

• Tight HOB over expected target variations• Significant sensitivity margin

– Gun-hardness proven in Canister Test

• Safe & Arm Device– Successfully passed HAST– Mechanism qualified on DPICM round– Gun-hardness proven in Canister Test

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Summary

• Mature System Concept– HOB sensor and S&A based on

qualified designs• Low Risk• Maximum Reliability• Rapid Development

– Meets all System Requirements– Team work essential part of

success

EX171 Meets or Exceeds User Needs!

Successful ERGM Guided Flight Test4m accuracy