Radar Sensor Crystal-less Signal Synthesizer Cost Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing FMCW radar systems rely on crystal oscillators for precise frequency control, which can be expensive for short-range applications with larger tolerance in frequency errors.
Innovation Solution
A radar sensor utilizing a crystal-less signal synthesizer to generate a frequency-modulated transmitted RF signal without a crystal oscillator, enabling cost-effective frequency control suitable for short-range FMCW applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a crystal oscillator is used to generate the transmitted RF signal, then frequency stability and precision are improved, but cost increases
Solution Approach 1:
The patent replaces expensive crystal oscillators with a cheaper alternative - a direct digital synthesis (DDS)-based signal generator that uses a microcontroller and software algorithms to generate frequency-modulated signals. This DDS approach eliminates the need for costly crystal components while maintaining sufficient frequency stability for short-range radar applications, directly addressing the cost-stability contradiction.
Solution Approach 2:
The patent changes the fundamental parameter of frequency generation from analog crystal-based oscillation to digital signal synthesis. By using a microcontroller to generate frequency-modulated signals through software control of a voltage-controlled oscillator (VCO), the system achieves flexible frequency control without requiring expensive crystal oscillators, thereby reducing cost while maintaining measurement precision for short-range applications.
2Measurement precision
If a crystal oscillator is used for frequency control, then frequency precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces the mechanical/electrical crystal oscillator system with a digital control system. Instead of using physical crystal resonators and analog oscillation circuits, the system uses a microcontroller to generate frequency-modulated signals through digital signal processing and voltage-controlled oscillation. This substitution simplifies the overall device architecture by eliminating complex crystal oscillator circuits while maintaining frequency control precision through software algorithms.
Solution Approach 2:
The patent employs a multi-functional microcontroller-based signal generator that can perform frequency modulation, pulse generation, and signal processing functions that would traditionally require separate dedicated circuits. This universal approach consolidates multiple functions into a single integrated system, reducing device complexity while maintaining the frequency control precision needed for radar applications.
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 radar sensor achieves accurate distance and velocity measurements while reducing costs associated with high-precision crystal oscillators, making it suitable for short-range FMCW applications.
Implementation Method 1
The transmitting antenna is configured to radiate a transmitted RF signal
Implementation Method 2
The receiving antenna is configured to receive a reflected RF signal from a target
Implementation Method 3
a mixer configured to provide an IF-band signal associated with the characteristic shift between the transmitted RF signal and the reflected RF signal by mixing the reflected RF signal and the transmitted RF signal
Data Source
AI summary
In a radar sensor, a transmitting antenna is configured to radiate a transmitted RF signal, a receiving antenna is configured to receive a reflected RF signal from a target, and a frontend circuit is configured to calculate the distance between the target and the radar sensor by measuring the frequency shift between the transmitted RF signal and the reflected RF signal. The frontend circuit includes a crystal-less signal synthesizer configured to generate the transmitted RF signal without using a crystal, and a mixer configured to provide an IF-band signal associated with the frequency shift between the transmitted RF signal and the reflected RF signal by mixing the reflected RF signal and the transmitted RF signal.