TCAS Antenna Beam Direction via Phase Control
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Solution Overview
Problem
Current Traffic Collision Avoidance System (TCAS) antennas require complex and costly four-beam patterns, which increase installation costs and electronics complexity, whereas existing systems aim to simplify this with a wide transmit beam of approximately 180 degrees, controlled by phase relationships between signal inputs to two-port antennas, enabling reduced cabling and cost-effective installation.
Innovation Solution
A TCAS antenna system with a directional two-port configuration that generates two complementary 180-degree transmit beams, allowing for simplified installation with fewer cables and reduced costs, by controlling the direction of the beams using phase relationships between signals input to the antenna elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a four-beam pattern is used in TCAS antenna systems, then collision avoidance coverage is improved, but device complexity and installation cost increase
Solution Approach 1:
The patent combines multiple beam functions into a single wide transmit beam of approximately 180 degrees. Instead of using four separate beam-forming antennas, the invention uses a single antenna element that radiates in a wide pattern, merging the functionality of multiple beams into one unified radiation pattern that still provides adequate collision avoidance coverage.
Solution Approach 2:
The wide transmit beam antenna serves multiple functions simultaneously - it provides forward coverage, aft coverage, and lateral surveillance all through a single 180-degree radiation pattern. This multi-functional approach eliminates the need for separate beam-forming antennas for different directional requirements.
2Reliability
If a four-beam pattern is used in TCAS antenna systems, then collision avoidance coverage is improved, but installation cost increases
Solution Approach 1:
The invention merges four separate antenna installations into one single antenna element. This consolidation reduces the number of cables required (from four to one), reduces mounting hardware requirements, and simplifies the overall installation process, directly reducing installation costs while maintaining adequate surveillance coverage.
Solution Approach 2:
The invention extracts and eliminates the unnecessary complexity of four-beam forming requirements from the TCAS antenna system. By removing the requirement for multiple beam-forming antennas and their associated cabling, the system achieves cost-effective installation while retaining essential collision avoidance functionality.
3Device complexity
If a wide transmit beam of 180 degrees is used, then device complexity is reduced, but beam direction control precision may worsen
Solution Approach 1:
The patent employs dynamic beam steering capability that allows the wide 180-degree transmit beam to be electronically steered to different azimuth angles. This dynamic control enables the system to adapt beam direction based on traffic conditions and collision threats, maintaining precision in direction control despite the wide beam width.
Solution Approach 2:
The system changes the phase relationship between signal inputs to control the direction of the wide beam. By adjusting phase parameters dynamically, the antenna system can precisely control beam direction and steering while maintaining the simplified single-element wide radiation pattern.
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 solution reduces the complexity and cost of TCAS antenna systems by enabling efficient beam direction control with fewer cables, achieving effective collision avoidance with reduced operational expenses and simplified installation processes.
Implementation Method 1
The direction of the wide beam is controlled by the phase relationship between the signals input to the two ports of the antenna
Data Source
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Figure 2
AI summary
A traffic collision avoidance system (TCAS), configured to transmit a wide transmit beam of approximately 180 degrees. The wide transmit beam may be, for example at the interrogation frequency or a transponder response frequency. The TCAS of this disclosure includes a directional antenna system with two signal input ports and two or more antenna elements. In some examples, the direction of the 180 degree beam may be controlled by the phase relationship between the signals input to the two port antenna. In other examples, the direction of the transmit beam from the antenna system is predefined to be in two complementary directions (e.g., forward and aft).