Pulse Transmitter Characterization via Doppler Shift
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Solution Overview
Problem
Current methods for characterizing pulse signal transmitters, such as radars and sonars, are ineffective for short pulses and modulated pulses with unknown modulation characteristics, as they rely on detecting carrier frequency variations, which are not precise in these cases.
Innovation Solution
The method involves using the variation of pulse repetition frequency or pulse pattern repetition frequency to determine the relative radial speed of the transmitter, independent of the pulse modulation characteristic, allowing for characterization of short duration pulses and modulated signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If carrier frequency variation is used to determine radial velocity, then the method works for most pulse signals, but it cannot accurately detect short pulses or modulated pulses with unknown characteristics
Solution Approach 1:
The patent changes the measurement parameter from carrier frequency to pulse repetition frequency. By measuring the frequency of pulse repetitions rather than the carrier frequency within pulses, the system can accurately determine radial velocity for short pulses and modulated pulses where carrier frequency detection fails. This parameter substitution resolves the contradiction by enabling both versatility across pulse types and measurement precision.
2Ease of manufacture
If carrier frequency is analyzed to determine radial velocity, then the method is simple to implement, but it fails for short pulses where carrier frequency cannot be detected with sufficient precision
Solution Approach 1:
The patent substitutes the measurement parameter from carrier frequency to pulse repetition frequency. This new parameter can be detected with sufficient precision even for short pulses because the pulse repetition frequency is determined by the timing between pulses rather than the frequency content within individual pulses. This resolves the contradiction by maintaining implementation simplicity while achieving measurement precision for short pulses.
3Adaptability or versatility
If carrier frequency variation is used for radial velocity determination, then the method works for unmodulated pulses, but it cannot handle modulated pulses with unknown modulation characteristics
Solution Approach 1:
The patent changes the measured parameter from carrier frequency to pulse repetition frequency. This parameter is independent of the pulse modulation characteristics, allowing the system to accurately measure radial velocity for modulated pulses where the modulation type is unknown or complex. This resolves the contradiction by providing both versatility across modulation types and measurement precision.
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 enables more precise and versatile characterization of pulse transmitters, capable of determining radial speed and position with improved accuracy for a wider variety of pulse signals, including short pulses and modulated ones.
Implementation Method 1
calculation of a frequency variation due to the Doppler effect for a first periodic quantity in said received pulse signal
Data Source
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AI summary
The invention relates to a method (200) for characterizing a pulse signal transmitter, said method (200) comprising the following steps: - reception (202), by a receiver, of the pulse signal (100) emitted by said transmitter, - calculation (206) of a frequency variation caused by the Doppler effect for a first periodic quantity in said pulse signal, and - determination (208-210) of the relative radial velocity of said transmitter with respect to said receiver, as a function of said frequency variation for said first periodic quantity; characterized in that said first periodic quantity is chosen from among the following quantities: - a pulse repetition frequency, or - a repetition frequency of emission patterns (106), each emission pattern (106) comprising a fixed number of several pulses (102). It also relates to a computer program, a device and a receiver implementing such a method.