AMCOM MK66 guidance system

System interface specifications Rocket management system (Target acquisition system on helicopter) IMU GPS Actuator system control Controller I/O bus

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 bps. Standard 9600bps baud rate will more than likely suffice

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

IMU 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

GPS 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 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)

Cyclone IMU 3 GPS 3 RMS 3 RS232 SDRAM ser. Actuator Control 8 par. Feedback n PC100 ADC 4

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 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 Nm To open the canards with a force applied 1 in from the pivot point, a force of N (24lb) is needed This force is possibly to large to produce within the design limitations (space and weight)

Optional Canard Deployments 1. Suicide 2. Different Shapes

NACA Airfoil 4 digit airfoil Example: 2412 Max chamber 0.02c Camber max location 0.4c Max thickness 0.12c

Simulation: Upcoming Goals Researching and understanding DATCOM Locating Aerospace Block Set and learning the software Analyzing various fin geometries Creating new deployment mechanisms