Amcom mk66 guidance system
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AMCOM MK66 guidance system. 11-18-2004. System interface specifications. Rocket management system (Target acquisition system on helicopter) IMU GPS Actuator system control Controller I/O bus. Rocket management system.

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System interface specifications
System interface specifications

  • Rocket management system

    • (Target acquisition system on helicopter)

  • IMU

  • GPS

  • Actuator system control

  • Controller I/O bus

Rocket management system
Rocket management system

  • Current system uses analog line for purposes of charging a timing capacitor

  • Proposed implementation of an RS-232 digital serial interface

  • RS-232 allows for target data transfer at comfortable data rates, from 300bps to 115200bps.

  • Standard 9600bps baud rate will more than likely suffice

Rocket management system cont d
Rocket management system (cont’d)

  • RS-232 implementation at 12V active-low

    • Allows for extended serial cable lengths

  • Allows for debugging based on a PC serial port using 12V active-low

    • PC may be used in conjunction with Matlab, C or other to simulate rocket management system outputs

  • Data format based on target data:

    • Current position and elevation

    • Target position and elevation

    • Current speed

  • Guidance module returns “target acquired” signal


  • IMUs may provide analog or digital outputs; IMUs that we have researched mostly output serial digital signals

  • 2-wire serial outputs, 5V TTL to Altera serial I/O line

    • Standard to be defined

  • I/O types:

    • Δv, Δθ

  • 9600bps transmission rate allows more than 8 times the necessary data rate for 16 corrections/second


  • Digital serial I/O lines

  • Provides P(x, y, z), ΔP(x, y, z)

  • 5VDC (TTL-level power), no voltage division required

  • Data transmission rate at 9600bps will allow for more than 8 times the necessary data rate for 16 corrections/sec

Altera cyclone system buses
Altera Cyclone system buses

  • Memory R/W/ADDR bus, 16MB system memory (SDRAM), interface specifications allow for SDRAM

  • SDRAM in PC100 specification, managed by onboard memory controller

  • Local serial, parallel buses

  • Actuator control:

    • Via parallel ports, can be used in conjunction with LM741/MIL741 and transistor drivers coupled to relays to trigger actuator assemblies

    • ADC ICs provide actuator position feedback, 8-bit parallel port solution for feedback to FPGA controller

  • System clock rates allow for 50MHz modulation (more than enough)







Actuator Control









8 par.



Additional fpga considerations
Additional FPGA considerations

  • Nios devel. kit has two serial ports; three are required for this application:

    • The RMS and IMU or GPS ports may be shared and appropriately multiplexed

  • Actuators:

    • 8-bit parallel port can be set to drive actuator driver circuit.

    • 8-bit parallel ports (4) will be used for feedback purposes from each servo with ΔV coming from an ADC

Force resisting canard deployment
Force Resisting Canard Deployment

  • Force acting on the canard due to acceleration of 80g’s is 42.7N (10 lb) acting on the centroid. (assuming canard dimensions in diagram)

  • This relates to a torque of 2.7225 Nm

  • To open the canards with a force applied 1 in from the pivot point, a force of 106.75N (24lb) is needed

  • This force is possibly to large to produce within the design limitations (space and weight)

Optional canard deployments
Optional Canard Deployments

2. Different Shapes

1. Suicide

Naca airfoil
NACA Airfoil

  • 4 digit airfoil

  • Example: 2412

    • Max chamber 0.02c

    • Camber max location 0.4c

    • Max thickness 0.12c

Simulation upcoming goals
Simulation: Upcoming Goals

  • Researching and understanding DATCOM

  • Locating Aerospace Block Set and learning the software

  • Analyzing various fin geometries

  • Creating new deployment mechanisms