Pseudo-random frequency sonar ping generation
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Solution Overview
Problem
Sonar imaging in fluid environments faces challenges with sparse data sets and high computational costs due to the need for precise frequency measurement and interference reduction, especially when dealing with multiple reflective objects and varying frequencies.
Innovation Solution
The use of pseudo-random frequency sonar ping pulses, processed using cheaper digital comparator circuitry and one-bit convolution techniques, to enhance data compression and reduce interference, allowing for more efficient imaging with multiple ping generators and detectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional sonar ping pulses with constant or linearly varying frequencies are used, then frequency measurement and interference reduction require high computational costs and complex processing, but this increases data processing requirements and computational load
Solution Approach 1:
The patent changes the frequency parameter from constant or linearly varying to pseudo-randomly varying throughout the ping pulse. This parameter change transforms the signal characteristics so that frequency measurement is simplified while maintaining precision, and interference from multiple reflective objects is reduced through the pseudo-random modulation pattern
Solution Approach 2:
The patent replaces complex digital signal processing with simpler one-bit convolution operations that can be performed with inexpensive digital comparator circuitry. The pseudo-random frequency pattern acts as a disposable signal structure that enables simplified processing rather than requiring expensive, complex computational resources
2Reliability
If multiple ping generators and detectors are used to improve imaging capability, then the ability to distinguish between multiple reflective objects improves, but interference from multiple objects increases and data processing requirements increase
Solution Approach 1:
The patent converts the harmful interference from multiple reflective objects into a beneficial signal by using pseudo-random frequency modulation. The pseudo-random pattern embedded in the transmitted signal allows the system to distinguish between signals from different objects even when they arrive simultaneously, transforming what would be interfering signals into distinguishable data through correlation processing
Solution Approach 2:
By changing the frequency parameter to pseudo-randomly vary throughout the pulse duration, the system creates unique temporal signatures for each transmitted ping. This allows multiple ping generators to operate simultaneously without causing interference, as each transmitter uses a different pseudo-random sequence that can be independently correlated at the receiver
3Measurement precision
If precise frequency measurement is performed to improve imaging resolution, then position information accuracy improves, but computational load and data processing requirements increase
Solution Approach 1:
The patent replaces complex mechanical or computational frequency measurement systems with a simpler pseudo-random code correlation approach. Instead of performing computationally intensive frequency analysis to determine position, the system uses one-bit convolution with pseudo-random sequences, which can be implemented with simple digital comparators rather than expensive computational resources
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 significantly reduces data processing requirements, enhances resolution, and improves the ability to distinguish between multiple reflective objects by producing optimized signal patterns that minimize interference and computational load.
Implementation Method 1
directing a sonar ping pulse at the object and recording sonar signals reflected from the object(s)
Implementation Method 2
recording sonar signals reflected from the object(s) with a sonar imaging array
Implementation Method 3
the sonar ping pulse has a frequency variation both increasing and decreasing during the ping pulse
Data Source
AI summary
In a sonar system using a large array multielement sonar detector to detect reflected signals sent out by a sonar ping generator, the sent out sonar ping generator sends out varying frequency sonar signals during each ping, where the frequency is neither monotonically increasing or monotonically decreasing.