Missile Position Estimation Using Radar Incident Angle Compensation
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Solution Overview
Problem
Current range instrumentation radars do not accurately consider the distance between the surface and the origin point of a missile when estimating its position, leading to imprecise positioning.
Innovation Solution
A method and apparatus that model the missile's shape, calculate the incident angle of radar signals, determine a distance compensation value based on this angle, and estimate the missile's position by calculating the distance from the radar to the origin point, using equations that account for the missile's conical head and cylindrical body geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional radar positioning methods are used that measure distance to the missile surface, then the positioning process is simple, but the position estimation precision is poor due to not accounting for the distance between surface and origin point
Solution Approach 1:
The patent pre-establishes a missile shape model with defined geometric parameters (conical head dimensions, cylindrical body dimensions) and pre-calculates the relationship between surface points and origin point. This preliminary preparation allows the system to quickly apply the established model during actual positioning without complex real-time calculations, thus improving precision while maintaining operational simplicity
Solution Approach 2:
The patent introduces a distance compensation value as an intermediary parameter that bridges the gap between the easily measurable surface distance and the desired origin point position. By calculating this compensation value based on the pre-established missile model and incident angle, the system can accurately derive origin point position without directly measuring it, resolving the contradiction between measurement simplicity and positioning precision
2Measurement precision
If the distance from radar to missile surface is used directly for position estimation, then the calculation is straightforward, but the result does not accurately represent the missile's true position at the origin point
Solution Approach 1:
The patent replaces direct physical measurement of the origin point distance with a computational approach. By substituting the mechanical measurement challenge with mathematical calculations based on the missile model, incident angle, and surface distance, the system achieves accurate origin point positioning without the technical difficulty of directly measuring to the origin point
Solution Approach 2:
The distance compensation value serves as a mathematical intermediary that transforms the measurable surface distance into the desired origin point distance. This intermediary allows the system to work with easily measurable quantities while achieving precise origin point positioning, effectively resolving the measurement difficulty
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for more precise estimation of the missile's position by accurately calculating the distance between the surface and the origin point, enhancing flight safety zones and positional accuracy.
Implementation Method 1
Range instrumentation radars are used to obtain the space-time position information of a missile in three-dimensional space
Implementation Method 2
receives a signal reflected from a target
Implementation Method 3
The Doppler radar transmits multiple frequencies to obtain distance information using a Doppler signal reflected from a moving target
Data Source
AI summary
In a method for estimating a position of a missile, an incident angle of a signal of a radar irradiated to the moving missile is calculated. The incident angle is defined by an angle between a measurement vector indicating a direction from the radar toward the missile and a movement vector indicating a moving direction of the missile. A distance compensation value from a point on a surface of the missile to an origin point of the missile is calculated based on the calculated incident angle. A distance from the radar to the origin point of the missile is calculated based on the calculated distance compensation value and a distance from the radar to the point on the surface of the missile. A position of the missile is estimated based on a position of the radar and the calculated distance from the radar to the origin point of the missile.