Target Capture ECE 4522 December 3, 2002 Design Document for Target Capture System Submitted to: Professor Joseph Picone ECE 4522: Senior Design II Department of Electrical and Computer Engineering Mississippi State University Mississippi State, Mississippi 39762 December 3, 2002 Submitted by: Heath Causey <[email protected]> Josh Wooten <[email protected]> Nobu Fuji <[email protected]> Renae Webb <[email protected]> Carlos Vasquez <[email protected]> Faculty Advisor: Dr. Robert Reese <[email protected]> Department of Electrical and Computer Engineering Mississippi State University Box 9571 Mississippi State, Mississippi 39762 DEPARTMENT OF ELECTRICAL & COMPUTER ENGINEERINGTarget Capture ECE 4522 December 3, 2002 EXECUTIVE SUMMARY In today’s society time management has become a priority of most people. Many people enjoy shooting rifles but do not have time to practice target shooting. Walking to the target consumes most of the time spent at the rifle range. The Target Capture System will display the target and bullet strike position to the shooter. With the use of this system, shooters will be able to eliminate unproductive time while sighting in rifles. A conveniently located target display will be viewable from the shooters location. Accessibility of target information will allow the shooter to remain in their position for extended periods. Several design constraints will exist during the construction of this system. The rifle shooter will require accurate target information. Our system will be able to determine the location of a bullet strike within 0.5 inches of the actual location. Computer graphics will be required to display the target to the user. A Personal Digital Assistant (Palm Pilot OS) was chosen because of the units’ inexpensive price, compact size, and battery life. The Palm Pilot OS software will accurately represent the bullet strike position in reference to the target. Cost of the parts for the Target Capture System should be less than $150, which makes the system affordable to most shooting enthusiasts. The system will consist of a collapsible shooting stand, an electrical component box at the target, and an electrical component box at the shooting station. The target stand should be collapsible and functional for a wide range of shooting environments. The battery life of the system should be substantial for several one-hour visits to the shooting range. Electrical boxes located at the target and at the shooters location should operate using 9-volt batteries for at least four hours. The system is implemented by utilizing the leading edge of the shock wave from the bullet. The shock wave will be sensed using an array of microphones. Once the wave has been detected, the signal will be amplified to 5V TTL logic with the use of operational amplifiers and comparators. The 5V TTL logic will be sent through a differentiator to filter out any low frequency produced in the surrounding environment. This logic will then be read by a microprocessor, which determines the order of the sound wave arrival times at each microphone. A microprocessor determines the difference of the shock wave arrival time of each microphone from the trigger microphone. Bullet position will be determined by triangulation calculation using these time differences. Time differences will be sent from the Target Base Station to the Shooter Base Station via wireless RF communication. A Personal Digital Assistant will plug into a serial port of the Shooter Base Station for accessibility of the time differences. System software will then be used to compute the appropriate calculations for displaying a graphical location of the bullet strike on the target to the shooter. Simple setup and accurate target information will make the Target Capture System a necessity for all rifle shooters. With the increasing abundance of Palm Pilot OS users, the Target Capture System will be the most convenient method to determine bullet strike positions. At an affordable price, the shooter can reclaim lost time on the shooting range. There are over 2000 shooting ranges affiliated with the National Rifle Association. Each rifle range is a potential consumer. Since our Target Capture System is geared to shooter enthusiast, the demand of such a system has great potential. When comparing prices of products used to view targets at the shooting range, the Target Capture System is an affordable product.Target Capture ECE 4522 December 3, 2002 TABLE OF CONTENTS ABSTRACT………………………………………………………………… 1. PROBLEM…………………………………………………………….. 2. OBJECTIVE……………………………………………………........... 2.1. Resolution………………………………………………………….. 2.2. Wireless Data Link………………………………………………… 2.3. Graphical Representation………………………………………….. 2.4. Position Coordinates, Order, and Number of Bullet Strikes………. 2.5. Bullet Velocity……………………………………………………... 2.6. Bullet Strike Velocity……………………………………………… 2.7. System Time Delay………………………………………………… 2.8. Collapsible System…………………………………………………. 2.9. Power………………………………………………………………. 2.10. System Cost………………………………………………………... 3. APPROACH…………………………………………………………….. 3.1. Introduction…………………………………………………………. 3.2. Shockwave Characteristics………………………………………….. 3.3. Triangulation Calculation…………………………………………… 3.4. Hardware Components……………………………………………… 3.4.1. Target Stand………………………………………………….. 3.4.2. Shockwave Detection Analog
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