FMCW Radar Amplitude-Controlled Pulses for Lower PA Heat
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Solution Overview
Problem
Conventional FMCW radar systems waste significant electrical power in generating radar signals that are not subsequently used due to the absence of significance in the observed scene, leading to inefficient power utilization and heat generation.
Innovation Solution
A FMCW radar device with a power amplifier (PA) controlled by circuitry to vary the amplitude of frequency-modulated pulses, allowing each pulse to have a non-rectangular profile and varying maximum amplitudes, reducing power consumption and heat generation by modulating the transmit signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional FMCW radar transmits continuous frequency-modulated pulses with constant rectangular amplitude, then the radar signal coverage is complete and reliable, but the power amplifier consumes excessive electrical power and generates unnecessary heat
Solution Approach 1:
The patent applies local quality by assigning different amplitude characteristics to different portions of the transmitted radar signal. Specifically, frequency-modulated pulses are given non-rectangular amplitude profiles (such as tapered or windowed shapes) rather than uniform rectangular amplitudes. This local variation in amplitude quality allows the radar to maintain sufficient signal strength in critical regions while reducing power consumption in less critical regions, thereby resolving the contradiction between power efficiency and signal completeness.
Solution Approach 2:
The patent implements dynamics by making the amplitude of frequency-modulated pulses variable rather than static. The maximum amplitudes of consecutive pulses are varied over time according to a controlled pattern, allowing the radar system to adapt its power transmission dynamically. This dynamic amplitude modulation enables the system to reduce overall power consumption and heat generation while maintaining reliable radar coverage through intelligent amplitude variation.
2Power
If the power amplifier operates at high power levels continuously, then the radar signal strength is sufficient for all scene observations, but heat generation and power loss increase significantly
Solution Approach 1:
The patent applies partial action by transmitting radar pulses with amplitude profiles that are tailored to the actual observation needs rather than using maximum power continuously. The non-rectangular amplitude profiles (such as tapered envelopes) deliver sufficient signal strength for effective scene observation while avoiding excessive power transmission. This partial action principle reduces power loss and heat generation by matching the transmitted power more closely to the actual requirements of radar detection.
3Device complexity
If rectangular amplitude profiles are used for frequency-modulated pulses, then the signal processing is simple and straightforward, but a large portion of transmitted power is wasted on insignificant data
Solution Approach 1:
The patent applies parameter changes by modifying the amplitude parameter of the frequency-modulated pulses from constant rectangular values to variable non-rectangular profiles. The amplitude parameter is varied according to specific patterns (such as tapered or windowed functions) that reduce power waste on insignificant radar returns. This parameter modification maintains relatively simple signal processing while significantly reducing the portion of power wasted on data that does not contribute meaningfully to scene observation.
Data Source
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AI summary
Provided is a Frequency Modulated Continuous Wave (FMCW) radar device. The FMCW radar device includes a Power Amplifier (PA) configured to amplify a transmit signal comprising a sequence of frequency-modulated pulses. Additionally, the FMCW radar device includes control circuitry configured to control the PA to vary an amplitude of the transmit signal. The control circuitry is configured to control the PA to cause the sequence of frequency-modulated pulses to exhibit at least one of the following characteristics: 1) each frequency-modulated pulse of the sequence of frequency-modulated pulses exhibits a non-rectangular amplitude profile; and 2) the respective maximum amplitudes of the frequency-modulated pulses vary over the sequence of frequency-modulated pulses.