Spread Spectrum Radar Signal Sequence Selection by Vehicle Elevation
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Solution Overview
Problem
Spread spectrum radar devices on vehicles with different elevations can interfere with each other due to using the same spread sequence, leading to errors in obstacle detection.
Innovation Solution
A method and apparatus that store multiple spread sequences associated with different elevation ranges, allowing the radar device to select and transmit a unique spread sequence based on the vehicle's elevation and travel direction to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the same spread sequence is used by all spread spectrum radar devices, then the device complexity is reduced and ease of operation is improved, but interference occurs between radar signals from vehicles on different elevations
Solution Approach 1:
The patent assigns different spread sequences to radar devices based on their local elevation characteristics. Each radar device selects a spread sequence corresponding to its specific elevation range, creating local differentiation that prevents interference while maintaining systematic operation. This resolves the contradiction by allowing identical operation simplicity across devices while introducing necessary local variation to eliminate interference.
Solution Approach 2:
The patent changes the spread sequence parameter based on the elevation parameter of the radar device. By mapping elevation ranges to specific spread sequences, the system dynamically adjusts the spread sequence parameter according to the device's operational environment, thereby preventing interference without complicating the overall system operation.
2Object-affected harmful factors
If different spread sequences are used for vehicles on different elevations, then interference is prevented, but the device complexity increases due to needing to store and select multiple sequences
Solution Approach 1:
The patent pre-associates multiple spread sequences with multiple elevation ranges and stores these associations in advance. When a radar device operates, it simply needs to determine its elevation range and retrieve the corresponding pre-assigned spread sequence, rather than performing complex real-time calculations. This preliminary preparation reduces the actual operational complexity while maintaining the ability to prevent interference.
Solution Approach 2:
The patent creates a universal mapping relationship between elevation ranges and spread sequences that can be applied to any radar device regardless of its specific location. This universal association table allows any device to independently determine its appropriate spread sequence based on its elevation, reducing the need for device-specific customization and thereby minimizing overall system complexity.
Data Source
AI summary
A method for transmitting a spread spectrum radar signal stores a plurality of spread sequences. Further, an elevation of a vehicle is measured by the method. Based on the measured elevation of the vehicle, the method selects at least one spread sequence of the plurality of spread sequences, and transmits a spread spectrum radar signal based on the selected at least one spread sequence. Additionally, the method may measure a travel direction of the vehicle, and then select at least one spread sequence based on the measured elevation of the vehicle and the measured travel direction of the vehicle.