Vehicle Radar Antenna Vertical Separation for Ground Bounce Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current vehicle radar systems face limitations in range and are prone to interference from ground reflections, while also lacking versatility in signal generation and processing, and are often costly to maintain.
Innovation Solution
A vehicle radar system comprising two separate antenna arrangements with overlapping fields of view, where the phase centers of the antennas are vertically separated by more than 10 times the free-space wavelength, combined with independent signal generators and processor units that alternate between master and slave roles to enhance detection range and reduce multipath interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single antenna arrangement is used, then the device complexity is low, but the detection range is limited and interference from ground reflections occurs
Solution Approach 1:
The radar system divides the antenna function into two separate antenna arrangements (first and second antenna arrangements), each with its own signal generator. This segmentation allows each antenna to be positioned at different vertical heights, extending the detection range and reducing ground reflection interference while maintaining manageable complexity through modular design
Solution Approach 2:
The patent introduces vertical separation between the two antenna arrangements by positioning their phase centers at different heights (exceeding 10 times the free-space wavelength apart). This dimensional change in the vertical axis enables extended detection range and mitigates ground bounce interference without significantly increasing horizontal footprint
2Adaptability or versatility
If signal generators are integrated into a single unit, then the device complexity is low, but the versatility in signal generation and processing is limited
Solution Approach 1:
The signal generation function is segmented into two independent signal generators, each associated with its own antenna arrangement. This allows each generator to operate independently with different signal parameters, enhancing versatility in signal generation and processing while maintaining low overall complexity through modular independence
Solution Approach 2:
The system implements dynamic role assignment where processor units can alternate between master and slave roles. This dynamic flexibility allows the system to adapt signal processing configurations based on operational needs, enhancing versatility without requiring permanently complex hardware architecture
3Measurement precision
If processor units work independently without coordination, then the processing speed is high, but the signal processing accuracy decreases
Solution Approach 1:
The system implements a master-slave feedback mechanism where the master processor unit coordinates and combines results from both processor units. This feedback loop ensures that independent processing operations are synchronized and integrated, maintaining high processing speed while improving signal processing accuracy through coordinated result combination
Solution Approach 2:
The master processor unit merges and combines the results from both slave processor units to form a unified detection output. This combining process integrates the strengths of independent processing while achieving accurate consolidated results, balancing processing speed and accuracy
4Object-affected harmful factors
If antenna arrangements are placed close together horizontally, then the device footprint is small, but the separation distance is insufficient to reduce ground bounce interference
Solution Approach 1:
Instead of increasing horizontal separation between antennas, the patent transitions to vertical separation by positioning phase centers at different heights (exceeding 10 times the free-space wavelength apart). This dimensional shift effectively reduces ground bounce interference while maintaining a compact horizontal footprint
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 configuration extends detection range, reduces interference from ground bounces, and improves signal processing accuracy while maintaining cost-effectiveness by enabling shared processor workload and complementary radar signal waveforms.
Implementation Method 1
A radar system comprises means for generating radar signals that are transmitted, reflected and received by means of appropriate antennas comprised in the radar system
Implementation Method 2
radar signals that are transmitted, reflected and received
Implementation Method 3
a considerable reduction the detrimental effect of multipath holes from ground bounces is enabled
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present disclosure relates to a vehicle radar system (101) comprising a first and a second antenna arrangement (111, 121), where the first antenna arrangement (111) has a first field of view (405) and the second antenna arrangement (111) has a second field of view (406). The first field of view (405) and the second field of view (406) have a common field of view (407) that occupies at least 80% of at least one of the first field (405) of view and the second field of view (406). A first phase center (310) of any array antenna (111T, 111R) comprised in the first antenna arrangement (111) and a second phase center (320) of any array antenna (121T, 121R) comprised in the second antenna arrangement (121) are separated along a vertical extension (V) by a distance dv exceeding 10 times λ where λ is a free-space wavelength that corresponds to a center frequency for at least one intended frequency band.