| System and method to minimize laser misalignment error in a firearms training simulator -> Monitor Keywords |
|
|
  System and method to minimize laser misalignment error in a firearms training simulatorUSPTO Application #: 20070287134Title: System and method to minimize laser misalignment error in a firearms training simulator Abstract: A weapon simulation system is used to correct the misalignment between a laser of a simulated weapon and an aim point of the simulated weapon. A compensation offset profile and a compensation angle profile are stored in a weapon controller card in the simulated weapon identifying the misalignment of the laser module in the corresponding simulated weapon. The compensation offset profile and compensation angle profile is transmitted from the weapon controller card to a central computer, where the central computer calculates the aim point of the simulated weapon using said compensation offset profile and said compensation angle profile from said weapon controller card. The position of the simulated weapon with respect to a screen of the weapon simulation system is further calculated using an RFID reader in electrical communication with the weapon controller card and at least one RFID tag positioned in a fire line mat, which transmits the position information to said central computer. (end of abstract) Agent: Smith, Gambrell & Russell - Atlanta, GA, US Inventor: Bobby Hsiang-Hua Chung USPTO Applicaton #: 20070287134 - Class: 434022000 (USPTO) Related Patent Categories: Education And Demonstration, Organized Armed Or Unarmed Conflict Or Shooting, Gunnery, Gun Aiming, Training Apparatus Using Beam Of Infrared, Visible Light, Or Ultraviolet Radiation, Beam Sensor Included In Apparatus The Patent Description & Claims data below is from USPTO Patent Application 20070287134. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED PATENT APPLICATIONS [0001] This non-provisional patent application claims priority from provisional patent application 60/803,307, filed on May 26, 2006, which is relied upon and incorporated herein by reference. FIELD OF THE INVENTION [0002] The present invention relates to weapon simulation systems having a sight, and, more particularly, to weapon simulation systems having a sight with a laser to calculate the correct orientation of a simulated weapon. BACKGROUND OF THE INVENTION [0003] Firearms training simulators train police and military personnel with the proper use and handling of weapons without using real firearms and their associated ammunition. The firearms simulator is designed for indoor training in a safe environment, and uses infrared laser modules housed in the barrel of a simulated weapon as a means to determine where the weapon is pointing on a two-dimensional screen. The distance between the student and the screen is very short relative to real world distances since the simulation is done in a typical interior room. In particular, firing line distances of twenty feet are not uncommon for a screen that may span thirty feet wide. [0004] Students use the day or optical sight of the simulated weapon to aim the firearm. In the real world, a process called boresighting, which involves mechanically adjusting a weapon's sight, is used to ensure that the sight of the simulated weapon is calibrated correctly to the shooter. With boresighting, the barrel is aimed at a point of reference, and is confirmed by an optical reference. This may be achieved by using the eye to look through the barrel, or by placing a suitable light source (e.g., a laser) into the barrel. The sight is then aligned to the same point of reference. Thus, once the firearm is boresighted, the sight can be "zeroed" by firing live rounds. [0005] For a weapon simulator, there is no projectile to verify the accuracy of boresighting as with actual weapons. Consequently, an electronic boresight is used to determine the offset necessary to determine the relationship between the laser impact and line of sight. Ideally, this electronic boresight should be able to define the relationship without respect to where the student is aiming on the screen. However, if there is any misalignment of the laser relative to the sight, then the only correct point is at the point of boresight and everywhere else would be incorrect. [0006] An example of this problem of misalignment in the horizontal direction (X) is illustrated in FIG. 1, wherein a simulated weapon 10 is aimed at a screen 12 bearing the system targets. The simulated weapon 10 is shown in two positions 10A, 10B having a corresponding aim point line 14A, 14B (the aim point line 14A, 14B may be any reference aiming line, such as the sight aim point (a line of sight) or barrel aim point), but the laser is projected along laser line 16A, 16B. The simulated weapon 10A is shown at the position at boresight. In order for the simulator to accurately determine the relationship between the line of sight or the aim point line 14 and the laser impact or laser line 16 over the entire screen 12, certain factors must be known. These factors include the amount of misalignment between the laser path 16 and line of sight 14. Because of the configuration of the room surrounding the weapon simulator 10, any error caused by misalignment is amplified across the horizontal span of the screen 12. That is, the projected length 18A, 18B into the plane of the screen 12 between the line of sight or aim point 14 and laser impact 16 changes significantly with changing position and orientation between the simulated weapon 10 and the screen 12 as shown in a comparison of the positions of weapon simulator 10A and weapon simulator 10B in FIGS. 1 and 2. The distance between the aim point line 14A and the actual laser line 16A of the first weapon position 10A is the error distance 18A, and the distance between the aim point line 14B and the actual laser line 16B of a second weapon 10B is the error distance 18B. Clearly the second error distance 18B is much greater than the first error distance 18A due to the orientation and position of each weapon position 10A, 10B, such that a single measurement for correction of the alignment error in the weapon 10A, 10B at different locations will not properly work. Further, the occasional overlap in the error distances 18A, 18B, as shown in FIG. 2, make it difficult for a central computer 15 of the weapon simulation system to ignore and compensate for this error since the misalignment could be large and unpredictable because the origination of the laser path 16A, 16B from corresponding weapon simulator 10A or 10B is not known. The same type of misalignment errors occur in the vertical direction (Y) as well. [0007] One partial solution is to mechanically align the laser line 16 with the line of sight 14 in the horizontal direction (X). However, because of tolerances in both the simulated weapon 10 and the measurement fixture, a repeatable perfect alignment of the laser line 16 may not be cost effective in a production environment. In addition, the mechanical alignment would not compensate any misalignment in the vertical direction (Y) since the aim point requires a clear path of any obstructions, such as the laser module, and readjustment would be necessary every time a new type of sight is used. BRIEF DESCRIPTION OF THE DRAWINGS [0008] FIG. 1 is a top view illustration of different aim points of simulated weapons on a target or screen at different positions; [0009] FIG. 2 is a top view illustration of different aim points of simulated weapons on the target or screen at different positions as illustrated in FIG. 1, with the weapons starting at different positions; [0010] FIG. 3 is a top view illustration from FIG. 1 showing a first error reduction due to misalignment using ELPM; [0011] FIG. 4 is a top view illustration from FIG. 1 showing a second error reduction due to misalignment using ELPM and LCSPS; [0012] FIG. 4a is a top view illustration from FIG. 4 showing an enlarged view of a simulated weapon illustrating offset and angle misalignment in the horizontal direction; [0013] FIG. 5 is an illustration of a simulated weapon user on a student positioning system; and [0014] FIG. 6 is an illustration of a simulated weapon having components for error correction illustrating offset and angle misalignment in the vertical direction. DESCRIPTION OF THE INVENTION [0015] A weapon simulation system and method to minimize laser misalignment error in a firearms training simulator addresses the problems in error correction found in conventional weapons simulators, providing a more accurate and cost effective solution to correcting the errors, is illustrated in the attached drawings. The weapon simulation system 8 includes a simulated weapon 10 having a weapon controller card 24 that is in electrical communication with a central computer 15, with the central computer creating and controlling the simulation scenario broadcast on a screen 12. The simulated weapon 10 includes a laser module 29 that generates a laser line 16 to be directed at a simulated target generated by the central computer 15 on the screen 12. Furthermore, the central computer 15 will monitor when the simulated weapon 10 has been fired and control scenarios surrounding operation of the simulated weapon 10 (such as when the simulated weapon experiences a simulated malfunction). [0016] Referring to FIGS. 3-6, accuracy of the measurement of the laser line 16 location on the screen 12 is improved through the use of an electronic laser profiling system or method (referred to as "ELPS" or "ELPM") 20 in a simulated weapon 10 (see FIG. 6) and a low-cost student positioning system (or "LCSPS") 22 in the environment surrounding the simulated weapon 10 (see FIG. 5). More specifically, the ELPS 20 can be used alone, as illustrated in FIG. 3, depending on the amount of error 21 that can be tolerated in a particular weapon simulation system 8. That is, if the central computer 15 assumes that the simulated weapon 10 is in a particular predetermined location in the X, Y, and Z directions at all times (as shown as 10A), even when the simulated weapon 10 is moved from that location (as shown as 10B), the error 21 is determined by having the central computer 15 extrapolate an assumed laser line 16C generated from simulated 10A rather than simulated weapon 10B to calculate an assumed aim point line 14C. The error 21 is the difference between the assumed aim point line 14C and the actual aim point line 14B. Alternatively, both the ELPS 20 and LCSPS 22 may be employed to allow for the use of compensation offsets D, D2 and angles .theta., .theta.2 profiles relative to a known reference plane P that are stored in each simulated weapon 10 for each of its sights/optics to determine the error that is needed to be corrected (see FIG. 4), and the aim point 17B is precisely located on the screen 12 according to the actual aim line 14B, analogous to aim point 17A being precisely located on the screen 12 according to the actual aim line 14B since it is at the boresight position. [0017] Referring to FIG. 6, the ELPS 20 incorporates the use of a weapon controller card 24 in the simulated weapon 10. The weapon controller card 24 includes a microprocessor/microcontroller having an electronic memory that will store information characterizing the alignment of a laser path 16 (emitted by laser module 29) relative to the sights 27 affixed to the simulated weapon 10. The weapon controller card 24 is connected with any sensors mounted in or affixed to the simulated weapon 10, and handles communication between the sensors and a central computer 15. More specifically, the actual positions of the laser impact 16 are noted for the sight 27, typically at the time when the simulated weapon 10 is being manufactured. The horizontal and vertical offsets D, D2 between the sight 27 and the laser path 16 as well as the horizontal and vertical angles .theta., .theta.2 between the aim point 14 and laser line 16 are measured for each sight 27 relative to a known reference plane P in order to ensure that the laser line 16 will match the line of sight 14 at the specified firing line distance 19. This data is then stored in the weapon controller card 24, which is housed in the simulated weapon 10. Because this information is electronically stored in the simulated weapon 10 itself, there are no moving parts that can cause the information to be incorrect (unlike mechanically corrected alignment between the laser beam from laser module 29 and sights 27), and it guarantees that any variations among designs of simulated weapon 10 will be consistent and minimized. [0018] The weapon controller card 24 stores this profile data (including compensation offset profiles and compensation angle profiles) electronically in the simulated weapon 10 to provide the adjustment information to the central computer 15 for the weapon simulation system 8. The ELPS 20 uses the offsets D, D2 from the aim point 14 of the simulated weapon 10 as a comparison to the actual laser hit 16 at the firing line distance 19 and the angles .theta., .theta.2 between the aim point lines 14A, 14B and the laser lines 16A, 16B relative to the sights 27. The ELPS 20 will allow the central computer 15 of the weapon simulator 10 to calculate the correct offset for any path in which the laser path 16 will follow at distances different from the boresighted point to allow the weapon simulator 10 to correct any misalignment of the laser path 16 if the position of the weapon simulator 10 is known (that is, the position of the simulated weapon from the target on the screen 12). [0019] Using the ELPS 20, the boresighting of the laser path 16 can be more exact, consistent, and robust, unlike a mechanical adjustment that will always have some tolerance stack up and human error, and will further be subjected to mechanical damage. Once the simulated weapon 10 is registered on the weapon controller card 24, the particular electronic laser profile will be downloaded to the central computer 15 of the weapon simulation system 8 so that the central computer 15 can adjust the laser position 16 electronically to compensate for any misalignment or error distance 18A, 18B due to mechanical tolerances in the manufacturing process. Continue reading... Full patent description for System and method to minimize laser misalignment error in a firearms training simulator Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this System and method to minimize laser misalignment error in a firearms training simulator patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like System and method to minimize laser misalignment error in a firearms training simulator or other areas of interest. ### Previous Patent Application: System and method of simulating firing of immobilization weapons Next Patent Application: 3d vehicle simulator system and simulation method for ecu embedded system Industry Class: Education and demonstration ### FreshPatents.com Support Thank you for viewing the System and method to minimize laser misalignment error in a firearms training simulator patent info. IP-related news and info Results in 4.04252 seconds Other interesting Feshpatents.com categories: Computers: Graphics , I/O , Processors , Dyn. Storage , Static Storage , Printers |
||
