Radar Pulse Output Shaping for Temperature-Stable Side Lobe Control
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Solution Overview
Problem
Existing pulse generating devices in radar systems face issues with output fluctuations due to environmental changes (temperature and aged deterioration), leading to non-detection, erroneous detection, and interference with other wireless devices, which can cause accidents or malfunctions.
Innovation Solution
A pulse generating device with a configuration that includes a high frequency oscillator, output variable device, power measuring unit, temperature measuring unit, baseband pulse generating unit, and modulator, which adjusts the output and pulse shape to maintain compliance with legal regulations and environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pulse generating device uses a simpler configuration to adjust pulse pattern, then device complexity is reduced, but output stability deteriorates due to temperature changes and aged deterioration
Solution Approach 1:
The patent implements a feedback mechanism where the output of the high frequency oscillator is fed back to the baseband pulse generating unit. The feedback signal contains information about output fluctuations caused by temperature changes and aged deterioration. The baseband pulse generating unit adjusts the pulse string parameters (number of pulses, pulse width, interval) based on this feedback to compensate for output variations and maintain stable high frequency pulse output.
Solution Approach 2:
The system performs self-adjustment by using its own output signal as feedback. The baseband pulse generating unit automatically modifies the pulse string configuration based on the detected output characteristics, enabling the device to self-correct for temperature drift and aging effects without external intervention.
2Measurement precision
If the high frequency pulse output increases, then detection capability is improved, but harmful interference to other wireless devices increases
Solution Approach 1:
The patent dynamically changes the parameters of the pulse string (number of pulses, pulse width, interval between pulses) to optimize the output characteristics. By adjusting these parameters based on feedback, the system can control the peak power and duty cycle of the high frequency pulse, ensuring sufficient detection capability while limiting interference to other wireless devices through regulated output levels.
3Manufacturing precision
If the pulse pattern is adjusted to comply with legal regulations, then regulatory compliance is achieved, but adaptability to environmental changes deteriorates
Solution Approach 1:
The patent transitions from a static pulse pattern to a dynamic adjustable pulse string. The baseband pulse generating unit can modify the pulse string parameters in real-time based on environmental conditions (temperature, aging). This dynamic capability allows the system to maintain regulatory compliance under normal conditions while adapting to environmental changes, resolving the contradiction between fixed compliance requirements and environmental adaptability.
Data Source
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AI summary
A pulse generating device of an in-vehicle radar configured to output a high frequency pulse including a main lobe and a side lobe includes a high frequency oscillator that generates a carrier wave of a predetermined frequency, an output variable device that adjusts an output of the high frequency oscillator, a power measuring unit that measures the output of the high frequency oscillator, a temperature measuring unit that measures an ambient temperature, a baseband pulse generating unit that generates a signal of a pulse shape, and a modulator that modulates the output of the high frequency oscillator with the signal of the pulse shape, and, when the ambient temperature is a first threshold value or less, the output or the pulse shape is adjusted so that the side lobe is a predetermined output or less.