Target Search Waveform Determination for S/R Ratio
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Solution Overview
Problem
Existing target search systems face challenges in determining an optimal transmission waveform to achieve a desired process gain when reflected waves from objects other than the target significantly influence the signal, leading to a deteriorated signal-to-reverberation ratio (S/R ratio).
Innovation Solution
A target search system that includes a signal processing unit for calculating mutual correlation between a transmitted and received signal, a specifying unit for user input of pulse length, frequency change ratio, and frequency amplitude, and a transmission wave determination unit to determine the transmission waveform based on the specified parameters to satisfy the equation PG = T0 * μ^2 * π, where PG is the process gain, T0 is the pulse length, μ is the frequency change ratio, and Δf = T0 * μ is the frequency amplitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal processing such as replica correlation is used to improve the S/N ratio, then the S/N ratio is improved, but the process gain is deteriorated when reflected waves from objects other than the target have much influence
Solution Approach 1:
The patent changes the parameters of the transmission waveform (pulse length T0, frequency change ratio μ, frequency amplitude Δf) to optimize the process gain. By establishing a mathematical relationship between these parameters and the process gain PG, the system can adjust waveform parameters to achieve desired performance when reverberation is present.
Solution Approach 2:
The patent introduces a feedback mechanism where the process gain PG is calculated based on the transmission waveform parameters, and this information is used to adjust the waveform parameters iteratively to achieve the desired S/R ratio. The system uses the relationship PG = T0 × μ² × π to guide parameter adjustments.
2Measurement precision
If trial and error method is used to determine transmission waveform, then a satisfactory S/R ratio may be achieved, but the determination process is time-consuming and lacks quantitative basis
Solution Approach 1:
The patent performs preliminary calculation of the process gain PG using the formula PG = T0 × μ² × π before actual waveform transmission. This allows the system to predict the S/R ratio outcome and adjust parameters in advance, avoiding time-consuming trial and error during operation.
Solution Approach 2:
The patent replaces the mechanical trial-and-error approach with a mathematical calculation system. By substituting the empirical adjustment process with a quantitative formula-based determination, the system achieves rapid and accurate waveform parameter selection without iterative testing.
3Reliability
If reflected wave from objects other than target is dominant, then the search system performance depends on process gain of S/R ratio, but no specific relational expression is known for process gain
Solution Approach 1:
The patent enables the system to self-determine the optimal waveform parameters by using the process gain relationship PG = T0 × μ² × π. The system automatically calculates the required parameters based on desired performance criteria without requiring external trial-and-error adjustment or complex iterative algorithms.
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 the determination of an appropriate transmission waveform that achieves a desired process gain, improving the S/R ratio and enhancing the performance of the target search system by quantitatively setting the pulse length and frequency change ratio, thereby overcoming the limitations of trial-and-error methods.
Implementation Method 1
a pulsed transmission wave modulated in linear frequency modulation
Implementation Method 2
calculates mutual correlation between the transmission wave and the received signal
Implementation Method 3
determines a remaining value of the transmission wave based on the specified one value of the pulse length, the frequency change ratio, and the frequency amplitude of the transmission wave and the specified process gain so as to satisfy PG=T0×μ2×π
Data Source
AI summary
A target search system includes: a signal processing unit that is input with a received signal including a reflected wave based on a pulsed transmission wave modulated in linear frequency modulation, calculates mutual correlation between the transmission wave and the received signal, and amplifies a power ratio of a signal component of a reflected wave from a target and another signal component at a predetermined process gain; a specifying unit by which a user specifies one value of a pulse length, a frequency change ratio, and a frequency amplitude of the transmission wave and the process gain; and a transmission wave determination unit that determines a remaining value of the transmission wave based on the specified one value of the pulse length, the frequency change ratio, and the frequency amplitude of the transmission wave and the specified process gain so as to satisfy a relational equation for the process gain.