Radar Sensor Temperature Drift Compensation

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Solution Overview

Problem

Current radar sensor systems face challenges in maintaining high accuracy and reliability due to temperature-related signal drift, especially in advanced driver assistance and autonomous driving applications where precise sensor data is critical.

Innovation Solution

A radar sensor system with at least two transmit and receive channels, equipped with temperature sensors, a modeling device to analyze temperature dependencies, and a compensation device to correct for these dependencies, either through hardware phase shifters or signal processing, ensuring improved operating characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If temperature compensation is implemented using traditional methods, then temperature stability is improved, but device complexity increases

Engineering Contradiction:

Improvetemperature stabilityVSAvoiddevice complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent changes the parameter of phase shift based on temperature measurements. The system measures temperature and dynamically adjusts phase shift parameters to compensate for temperature-induced signal drift, thereby improving temperature stability without adding complex hardware structures.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces traditional mechanical or hardware-based temperature compensation mechanisms with a signal processing approach. By using digital signal processing to model and compensate for temperature dependencies, the system achieves temperature stability while avoiding the complexity of additional mechanical compensation devices.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If multiple temperature sensors and compensation devices are added, then measurement precision is improved, but device complexity increases

Engineering Contradiction:

Improvedetection qualityVSAvoiddevice complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent makes the existing receiver device serve multiple functions: it not only receives radar signals but also measures temperature. By integrating temperature sensing capability into the receiver device, the system improves measurement precision without adding separate dedicated temperature sensors, thereby avoiding increased device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines the temperature measurement function with the receiver device. The receiver device is used both for signal reception and temperature sensing, merging two functions into one component. This reduces the number of separate components needed while maintaining high measurement precision.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If temperature compensation is performed in real-time during transmitting and receiving, then reliability is improved, but use of energy increases

Engineering Contradiction:

Improveoperating reliabilityVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent performs temperature measurement and compensation in a periodic manner during the radar operation cycles. Rather than continuous real-time compensation, the system measures temperature at intervals and applies compensation during signal processing, maintaining reliability while reducing continuous energy consumption compared to truly continuous compensation.

Inventive Principle:

Principle #19Periodic action

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 system effectively compensates for temperature-induced signal drift, enhancing detection quality and maintaining reliable operation with reduced design complexity and cost, supporting high design freedom and variety in sensor system design.

Implementation Method 1

a temperature sensor for acquiring the temperatures of the at least one transmitter device and the at least one receiver device

Methodology Applied

Scientific EffectTemperature sensing:

Implementation Method 2

at least one transmitter device, with all transmitter devices having a total of at least two transmit channels

Methodology Applied

Scientific EffectElectromagnetic radiation:

Implementation Method 3

at least one receiver device, with all receiver devices having a total of at least two receive channels

Methodology Applied

Scientific EffectElectromagnetic radiation detection:

Data Source

PatentUS11467251B2Radar sensor system and method for operating a radar sensor system

Publication Date: 2022.10.11 ROBERT BOSCH GMBH

AI summary

A radar sensor system having at least one transmitter device, all transmitter devices having a total of at least two transmit channels; and at least one receiver device, with all receiver devices having a total of at least two receive channels; a temperature sensor in each case for sensing the temperatures of the at least one transmitter device and the at least one receiver device, a modeling device for modeling at least one temperature dependency of the at least one transmitter device from the at least one receiver device; and a compensation device for compensating for the modeled temperature dependency.