FMCW Radar Beat Signal Frequency Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing FMCW radar devices require multiple band-pass filters and switches to detect multiple targets over a wide range, leading to increased costs due to the need for multiple range observation periods with different pass bandwidths.
Innovation Solution
The FMCW radar device sets multiple range observation periods with varying modulated frequency widths, ensuring that the difference among maximum frequencies of the beat signals generated for each period is zero or within a predetermined range, eliminating the need for multiple filters and switches by using a single reception system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple band-pass filters and switches are used to detect multiple targets over a wide range, then the detection capability and measurement precision are improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent changes the parameter of modulated frequency width dynamically according to the range observation period. By adjusting the modulated frequency width parameter, the system can adapt to different range observation periods without requiring multiple fixed band-pass filters, thus reducing device complexity while maintaining measurement precision across different ranges
Solution Approach 2:
The patent makes a single band-pass filter perform multiple functions by dynamically adjusting its pass bandwidth according to the current range observation period. The same filter can handle different frequency ranges by changing its parameters, eliminating the need for multiple dedicated filters for different target ranges
2Adaptability or versatility
If multiple band-pass filters with different pass bandwidths are switched for each range observation period, then the adaptability to different range observation periods is improved, but the device complexity and cost increase
Solution Approach 1:
The system achieves adaptability to different range observation periods by dynamically changing the pass bandwidth parameter of a single band-pass filter rather than switching between multiple fixed filters. This parameter-based adaptation reduces the need for multiple physical components and switches
Solution Approach 2:
The patent introduces dynamic adjustment of the band-pass filter's pass bandwidth according to the current range observation period. Instead of static multiple filters, the system uses a single filter whose characteristics can be dynamically modified to match the requirements of different observation periods, reducing overall device 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
This approach allows for the detection of multiple targets and measurement of their distances and speeds at a lower cost without the need for multiple filters and switches, reducing the overall expense of the radar system.
Implementation Method 1
mix the transmission signal and the reception signal together to generate a beat signal
Data Source
AI summary
The FMCW radar device includes: a range observation period setting section configured to set a plurality of range observation periods; a modulated frequency width setting section configured to set, for the respective plurality of range observation periods, a plurality of modulated frequency widths; a beat signal generation section configured to generate, for the respective plurality of range observation periods, beat signals based on the transmission signal and the reception signal; and a pass bandwidth setting section configured to set pass bandwidths of the beat signals generated by the beat signal generation section, in which the modulated frequency width setting section sets, for the respective plurality of range observation periods, the plurality of modulated frequency widths so that a difference among maximum frequencies of the beat signals generated for the respective plurality of range observation periods becomes zero or falls within a predetermined range.