Adaptive Automotive Radar Using GPS Roadway Detection
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Solution Overview
Problem
Existing automotive radar systems operate in a fixed mode, compromising performance across different road conditions, such as divided highways and urban environments, where varying resolution and power are needed for optimal object detection and speed measurement.
Innovation Solution
An adaptive radar system that uses GPS data to adjust the number of horizontal scan positions and waveform patterns of the transmitter and receiver, optimizing operation for specific road types, such as reducing scan positions on highways for long-range detection and increasing resolution and power in urban areas for pedestrian detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the radar system uses a fixed mode of operation with a preset number of horizontal scan positions, then the system structure is simple and easy to implement, but the radar performance is compromised for different road conditions and cannot adapt to varying detection requirements
Solution Approach 1:
The patent applies dynamics by making the number of horizontal scan positions adjustable rather than fixed. The system dynamically changes the number of active scan positions based on detected roadway type (e.g., using fewer positions on highways for long-range detection and more positions in urban areas for high-resolution detection of pedestrians and animals), allowing the radar system to adapt its configuration to different operating conditions.
Solution Approach 2:
The patent changes the parameter of horizontal scan positions from a fixed preset value to a variable parameter that can be adjusted based on roadway conditions. The control circuit modifies the number of horizontal scan positions as a function of the detected roadway type, enabling optimal radar performance for different scenarios while maintaining manageable system complexity through automated parameter adjustment.
2Measurement precision
If the radar system increases the number of horizontal scan positions to improve resolution for detecting pedestrians and animals in urban areas, then the detection resolution improves, but the system cannot maintain accurate speed measurement capability for highway operations
Solution Approach 1:
The system dynamically adjusts the number of horizontal scan positions based on the detected roadway type. In urban areas, it increases the number of scan positions to achieve high resolution for detecting pedestrians and animals. On highways, it reduces the number of scan positions to maintain accurate speed measurement capability. This dynamic adaptation allows the system to optimize for different detection requirements without compromising either capability permanently.
Solution Approach 2:
The patent changes the parameter of horizontal scan positions from fixed to variable, allowing the system to optimize detection resolution when needed (urban areas with pedestrians/animals) while maintaining speed measurement accuracy when required (highway operations). The control circuit automatically adjusts this parameter based on roadway detection, resolving the contradiction between resolution and speed measurement accuracy.
3Measurement precision
If the radar system increases the transmitted power to detect low-power-density objects like pedestrians and animals, then the detection capability for small objects improves, but the system cannot simultaneously optimize for long-range vehicle detection on highways
Solution Approach 1:
The system dynamically adjusts transmitted power based on the detected roadway type and detection requirements. In urban areas where pedestrians and animals are detected, the system increases transmitted power to enhance detection capability for these low-power-density objects. On highways, the system optimizes power levels for long-range vehicle detection. This dynamic power adjustment allows the radar to optimize for different detection scenarios without permanently compromising either small object detection or long-range capability.
4Productivity
If the radar system operates in a compromised fixed mode designed as a compromise between different road conditions, then the system operation is simple, but the operating results are suboptimal for specific roadway types
Solution Approach 1:
The system applies self-service by automatically detecting the roadway type and autonomously adjusting its operating parameters without requiring manual intervention. The control circuit receives roadway type information, automatically determines the optimal number of horizontal scan positions, and configures the radar system accordingly. This automated self-adjustment improves operating efficiency for specific roadway types while avoiding the complexity of manual configuration, resolving the contradiction between productivity and operation complexity.
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
The adaptive system enhances radar performance by providing optimal range detection and velocity measurement on highways while ensuring detection of smaller objects in urban areas, improving overall safety and accuracy.
Implementation Method 1
a transmitter transmits a microwave signal, e.g. at a center frequency of 76.5 gigahertz, so that the transmitted radio signal repeatedly sweeps between two frequencies. In the event that there is an object within the range of the vehicle, the transmitted radio frequency is reflected back as an echo towards the vehicle transmitting the radio signal.
Implementation Method 2
the transmitted radio frequency is reflected back as an echo towards the vehicle transmitting the radio signal
Implementation Method 3
the radar system is used in conjunction with a GPS system which generates an output signal of the type of roadway currently traveled by the automotive vehicle
Data Source
AI summary
A dedicated short range radar system is provided for use with a GPS system. The radar system includes a transmitter which transmits a microwave radio signal. A receiver is coupled to a horizontally scanning receiver antenna array which receives an echo, if present, from the radio signal transmitted by the transmitter. The radio receiver then generates an output signal representative of the echo. A control circuit then receives the output signal from the antenna array as well as the output signal from the GPS system. The control circuit then varies the mode of operation of the receiver and/or the transmitter as a function of the type of roadway for optimal radar performance.