DBF Radar Transmitting Antenna Azimuth Gain Control
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Solution Overview
Problem
Digital beam forming (DBF) radar systems face limitations in achieving both long-distance detection and short-distance wide-angle monitoring due to the wide transmission beam width, which results in low transmitting antenna gain and reduced maximum detection distance.
Innovation Solution
A radar device with a transmitting antenna that has directivity characteristics with gains set based on distance attenuation, allowing for efficient allocation of transmitting power across different azimuths to maintain constant signal-to-noise ratio, enabling both long-distance detection and short-distance wide-angle monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a wide beam width is used for transmission in DBF system, then wide-angle monitoring capability is improved, but transmitting antenna gain decreases and maximum detection distance is shortened
Solution Approach 1:
The patent applies local quality by setting different transmitting gains for different azimuth directions. The transmitting antenna creates direction-dependent beam patterns where gain is locally optimized for each azimuth sector. This allows the system to provide strong transmission gain in specific directions for long-distance detection while maintaining adequate coverage in other directions, resolving the contradiction between wide coverage and long detection distance.
2Measurement precision
If transmitting gain is increased for long-distance detection, then maximum detection distance is improved, but power consumption increases and interference to other directions occurs
Solution Approach 1:
The system implements local quality by directing high transmitting gain only in specific azimuth directions where long-distance detection is required, rather than uniformly across all directions. This localized gain allocation reduces overall power consumption compared to omnidirectional high-gain transmission, while eliminating interference to directions where high gain is not needed. The direction-dependent gain structure ensures energy efficiency alongside long-distance detection capability.
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 allows for improved target detection performance across the entire coverage area, enhancing detection precision at short distances and maintaining long-distance detection capabilities, while minimizing power consumption and interference.
Implementation Method 1
a transmitting antenna 3 that radiates waves toward an observation range
Implementation Method 2
receives a reflected wave that is reflected by an object which exists within the space
Data Source
AI summary
To provide a radar device that is capable of performing both of long-distance detection performance and short-distance wide-angle monitor in a DBF system radar, there is provided a radar device of a digital beam forming system that radiates waves toward a space, receives a reflected wave that is reflected by an object which exists within the space, and subjects the received reflected wave to signal processing to thereby measure the object, the radar device including a transmitting antenna that radiates waves toward an observation range where required maximum distances different in respective azimuths are assumed, and has a directivity characteristic in which the transmitting gains in the respective azimuths are set on the basis of the distance attenuation characteristic at the required maximum distances.