Remote Sensing Pulse Inhibition for Range Ambiguity
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Solution Overview
Problem
Current remote sensing technologies using pulsed waves face limitations in obtaining detailed information from complex or mobile objects due to restrictive modulation frequencies, leading to inadequate spectral coverage and range ambiguity.
Innovation Solution
The introduction of a pulse inhibition system that periodically prevents wave emission, with inhibition periods proportional to the pulse period, contributing to the frequency content of the transmitted waves, allowing for flexible refinement of the emission spectrum and improved measurement information extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pulse repetition frequency (PRF) is increased to enable easier detection due to higher emitted radio energy, then detection capability is improved, but the maximum unambiguous range decreases
Solution Approach 1:
The patent applies periodic pulse inhibition where specific pulses are systematically omitted from the pulse train according to a predetermined pattern. This creates a periodic structure in the time domain that translates to spectral line spacing in the frequency domain, enabling multifrequency loading while maintaining high PRF for improved detection capability without sacrificing maximum unambiguous range.
Solution Approach 2:
The patent modifies the temporal parameters of the pulse train by introducing inhibition periods at specific intervals. This changes the spectral characteristics of the emitted signal, creating multiple frequency components that enable simultaneous multifrequency loading. The parameter changes in pulse timing allow the system to achieve both high detection capability and extended unambiguous range.
2Measurement precision
If predefined modulation frequencies are used for pulse compression, then range resolution is improved, but spectral coverage becomes restrictive and insufficient for complex or mobile objects
Solution Approach 1:
The patent makes the pulse train serve multiple spectral functions simultaneously by introducing periodic inhibitions that create multiple frequency components. The same inhibited pulse train enables both pulse compression for range resolution and multifrequency loading for extended spectral coverage, allowing the system to adapt to different target characteristics without requiring separate modulation schemes.
Solution Approach 2:
The patent introduces dynamic flexibility in the pulse train structure through configurable inhibition patterns. The inhibition periods can be adjusted to create different spectral line spacings and frequency components, enabling the system to adapt its spectral coverage to match the specific requirements of different targets, whether stationary or mobile, complex or simple.
Data Source
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AI summary
In an emission process for remote sensing, pulse signals (630) are periodically produced in elementary time windows spaced one pulse period (T) apart, and waves corresponding to those signals are emitted towards remote objects, so as to enable to monitor waves transmitted by those objects upon receiving the emitted waves. The emission of those waves is periodically prevented, according to at least one inhibition period (3T, 5T) proportional to the pulse period and equal to at least three times that pulse period. Parameters are set, suited to producing measurement information on the objects from the wave monitoring, based on at least part of a frequency content of the transmitted waves to which the pulse and inhibition periods contribute. Applications to lidars, radars, active sonars and ultrasound monitoring.