# US 2021/0278516 A1 · Weapon on-board velocity and range tracking > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0278516 A1 - Document ID: US20210278516A1 - Status: Published application - Kind: A1 - Application number: 16/782,106 - Filed: 2020-02-05 - Published: 2021-09-09 - Earliest claimed: 2020-02-05 - Assignees: BAE Systems Information and Electronic Systems Integration Inc. - Applicants: BAE SYSTEMS Information and Electronic Systems Integration Inc. - Inventors: Michael J. CHOINIERE; Jason H. BATCHELDER; Matthew F. CHROBAK - Web page: https://patentgrep.com/patent/US20210278516A1 ## CPC - G01S 11/08: using synchronised clocks - F41G 7/007: {Preparatory measures taken before the launching of the guided missiles} - F41G 7/34: based on predetermined target position data - F41G 9/00: Systems for controlling missiles or projectiles, not provided for elsewhere - G01S 11/12: using electromagnetic waves other than radio waves - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - F41G: WEAPON SIGHTS; AIMING (optical aspects thereof G02B) ## Abstract The system and method of weapon on-board range and velocity tracking using a synchronized clock and a pulse beacon on a fire control system, or the like, coupled with an on-board rear-facing detector and processor. A round or a UAS may use this system to accurately estimate range with respect to the fire control system, over time, and the round's or UAS's velocity at various times along its flight path. The system provides for smaller miss distances, and the like. ## Claims ### Claim 1 A moving object, comprising: a rear-facing receiver for receiving RF or EO/RF signals; a computer program product including one or more machine-readable mediums encoded with instructions that when executed by one or more on-board processors cause a process to be carried out for range and velocity tracking, the process comprising receiving a synchronized pulsed waveform transmitted via a pulse beacon on a fire control system along with a code used to identify the synchronized pulsed waveform; generating a time stamp upon arrival of the synchronized pulsed waveform at the rear-facing receiver; comparing an arrival time of the received pulse to the synchronized waveform to determine an initial time delay (T1 received−T1 master); calculating the time delay and determining a position of the moving object relative to the fire control system; and determining a velocity of the moving object at launch and over time by analyzing a plurality of positions of the moving object relative to the fire control system using the synchronized pulsed waveform. ### Claim 2 (depends on 1) The moving object according to claim 1, wherein the moving object is a round, a weapon, a projectile, a ballistic, a bullet, a munition, or a guided weapon. ### Claim 3 (depends on 1) The moving object according to claim 1, wherein the moving object is an unmanned aircraft system (UAS). ### Claim 4 (depends on 1) The moving object according to claim 1, wherein the pulse beacon is an IR/EO or RF beacon. ### Claim 5 (depends on 1) The moving object according to claim 1, wherein a time precision is embedded within the synchronized pulsed waveform. ### Claim 6 (depends on 1) The moving object according to claim 1, wherein the synchronized pulsed waveform is a pre-scripted, staggered waveform, or pulse pattern, to mitigate potential jamming of the pulse beacon. ### Claim 7 (depends on 1) The moving object according to claim 1, wherein the rear-facing receiver is a detector capable of receiving the synchronized pulsed waveform from the pulse beacon and processing a time stamp for time of arrival for a received pulse. ### Claim 8 A method of on-board range and velocity tracking, comprising: synchronizing a pulsed waveform using a master clock located on a fire control system; transmitting the synchronized pulsed waveform via a pulse beacon located on a fire control system; transmitting a code used to identify the synchronized pulsed waveform via the pulse beacon located on the fire control system; launching a moving object from the fire control system, wherein the moving object generates a distance from the fire control system over time; receiving, via a rear-facing receiver on-board the moving object, the transmitted synchronized pulsed waveform; generating a time stamp upon arrival of the transmitted synchronized pulsed waveform at the rear-facing receiver; comparing, via an on-board processor, an arrival time to the synchronized pulsed waveform to the synchronized pulsed waveform to determine a time delay; calculating the time delay and determining a position of the moving object relative to the fire control system; and determining the moving object's velocity by analyzing a plurality of positions relative to the fire control system using the synchronized pulsed waveform. ### Claim 9 (depends on 1) The method of on-board range and velocity tracking according to claim 1, wherein the moving object is a round, a weapon, a projectile, a ballistic, a bullet, a munition, or a guided weapon. ### Claim 10 (depends on 1) The method of on-board range and velocity tracking according to claim 1, wherein the moving object is an unmanned aircraft system (UAS). ### Claim 11 (depends on 1) The method of on-board range and velocity tracking according to claim 1, wherein the pulse beacon is an IR/EO or RF beacon. ### Claim 12 (depends on 1) The method of on-board range and velocity tracking according to claim 1, wherein a time precision is embedded into the synchronized pulsed waveform. ### Claim 13 (depends on 1) The method of on-board range and velocity tracking according to claim 1, wherein the synchronized pulsed waveform is a pre-scripted, staggered waveform, or pulse pattern, to mitigate potential jamming of the pulse beacon. ### Claim 14 (depends on 1) The method of on-board range and velocity tracking according to claim 1, wherein the rear-facing receiver is a detector capable of receiving the waveform from the pulse beacon and processing a time stamp of time of arrival for a received pulse.