Airborne Avoidance System Using Frequency Modulated Signal Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing defense systems, particularly anti-missile missile types, are ineffective in allowing aerial mobiles to avoid intercepting attacking flying machines due to limitations in detecting and analyzing the direction and distance of incoming threats under various conditions.
Innovation Solution
An air mobile equipped with automatic piloting means, detection antennas for transmitting and receiving electromagnetic signals, and an altimetry antenna performs a process involving frequency-modulated sinusoidal signal transmission and analysis to determine the frequency difference between emitted and reflected signals, allowing for the calculation of the interception machine's evolution parameters and direction, enabling automatic avoidance maneuvers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromagnetic signals are transmitted continuously for threat detection, then detection capability is improved, but signal interference and analysis difficulty increase
Solution Approach 1:
The patent applies periodic pulsed transmission of electromagnetic signals instead of continuous transmission. The signal is transmitted in periodic pulses with specific duty cycles, allowing the system to detect threats while maintaining periods of silence for clear signal analysis without self-interference.
2Loss of information
If pulse modulation is used to reduce signal interference, then signal analysis quality is improved, but detection precision during pulse transitions may deteriorate
Solution Approach 1:
The patent performs preliminary frequency estimation and spectral analysis during the silent periods between pulses, before the next pulse transmission begins. This allows the system to process and analyze reflected signals completely before new transmissions start, avoiding analysis during pulse transitions.
3Device complexity
If shared transmit-receive chain is used between detection and altimetry antennas, then device complexity is reduced, but functional reliability may worsen
Solution Approach 1:
The patent implements time-division multiplexing where the shared transmit-receive chain alternates between detection antenna operation and altimetry antenna operation in periodic cycles. Each antenna gets dedicated time slots for transmission and reception, eliminating signal conflicts while maintaining hardware simplicity.
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 solution enables the air mobile to automatically detect and avoid intercepting threats by determining the direction and distance of incoming machines, effectively aborting potential interceptions, even under adverse meteorological conditions, while minimizing interference from transmitted signals through pulse modulation.
Implementation Method 1
antennas for transmitting and receiving electromagnetic signals, called detection antennas... at least one reflected electromagnetic signal, which corresponds to the reflection of said electromagnetic signal emitted on said flying machine
Implementation Method 2
at least one electromagnetic signal, the frequency of which is modulated in time... whose frequency varies linearly as a function of time according to a predetermined modulation law
Implementation Method 3
from said emitted and reflected electromagnetic signals, at least one analysis signal is formed, the frequency of which corresponds to the frequency difference between the frequencies of said emitted and reflected signals
Implementation Method 4
a spectral analysis of said analysis signal is carried out to determine at least one value of said frequency difference and to eliminate the ground echo
Data Source
AI summary
- Method and system for avoiding an interception device by an aerial mobile. - According to the invention, the avoidance system (1A) comprises means (13) for determining, from at least the value of an evolution parameter (R, Vr) of an interception device relative to said mobile and the direction of arrival (θo, Φo) of said device relative to said mobile, an avoidance command intended for automatic piloting means of said mobile, so that the latter automatically performs an avoidance maneuver of said device.