Multistatic Radar Target Detection Using Echo Correlation
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Solution Overview
Problem
Multistatic primary surveillance radar systems face challenges in obtaining azimuth information due to the separation of transmitting and receiving antennas, necessitating a unique target detection method that can accurately discriminate echoes from the same target in a multistatic environment.
Innovation Solution
A target detection apparatus and method utilizing a transmitter device and multiple receiver devices, where each receiver adds time stamp information to echo data, and a correlation processor extracts echo signals with common intersections from ellipses formed by the positions of transmitting and receiving antennas, allowing for accurate target detection by correlating the positions and timing of echoes across multiple receiver devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a multistatic radar system separates transmitting and receiving antennas at different locations, then the coverage area and detection capability are improved, but the ability to obtain azimuth information and discriminate echoes from the same target deteriorates
Solution Approach 1:
The patent transitions from two-dimensional planar position detection to three-dimensional spatial detection by incorporating elevation angles. The detection apparatus calculates three-dimensional positions using combinations of azimuth angles from transmitting antennas, elevation angles from receiving antennas, and propagation times, thereby resolving the azimuth information limitation in multistatic configurations
Solution Approach 2:
The patent introduces propagation time as an intermediary parameter to correlate echoes from multiple receiving antennas to the same target. By calculating the relationship between propagation times and antenna positions, the system can discriminate whether echoes received at different locations originate from the same target, even without direct azimuth measurement at receiving antennas
2Reliability
If multiple receiving antennas are deployed at different locations, then the target detection coverage and reliability are improved, but the complexity of correlating echoes from the same target across multiple receivers increases
Solution Approach 1:
The patent segments the echo correlation process into systematic steps: calculating propagation times from each transmitting antenna to each receiving antenna, comparing received echoes against expected propagation time patterns, and incrementally building target position information. This segmented approach reduces the complexity of correlating echoes across multiple receivers by breaking down the problem into manageable computational stages
Solution Approach 2:
The patent performs preliminary calculations of propagation times between all transmitting and receiving antenna pairs before actual target detection. By pre-computing these time relationships and storing them as reference data, the system simplifies the real-time correlation process, as the complex geometric relationships are already established and can be directly applied during target detection
3Device complexity
If omnidirectional transmitting antennas are used instead of directional rotating antennas, then the system simplicity and lack of moving parts are improved, but the azimuth information acquisition capability deteriorates
Solution Approach 1:
The patent compensates for the loss of azimuth information from omnidirectional antennas by measuring elevation angles at the receiving antennas. The three-dimensional position detection uses combinations of azimuth angles from transmitters, elevation angles from receivers, and propagation times to fully determine target positions, thereby recovering the azimuth information that would otherwise be lost
Solution Approach 2:
The patent implements a feedback mechanism where the detected three-dimensional target positions are used to validate and refine the azimuth information derivation. By continuously monitoring detection results and comparing them with expected geometric relationships, the system can adjust and improve the accuracy of derived azimuth information, ensuring that the simplified omnidirectional antenna system does not compromise detection accuracy
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
Enables accurate detection of targets by correctly discriminating echoes from the same target, even in the presence of multiple targets, improving the overall performance of multistatic primary surveillance radar systems.
Implementation Method 1
a transmitting antenna configured to transmit a radio wave, and a receiving antenna configured to receive an echo from the target based on the radio wave transmitted by the transmitting antenna
Data Source
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AI summary
According to an embodiment, a target detection apparatus is applicable to a radar system. The radar system includes receivers (11 to 14) each receives, by a receiving antenna (111), an echo from a target based on a radio wave transmitted from a transmitting antenna (101) of a transmitter (10). The target detection apparatus includes tracking processors (301) and a correlation processor (302). The tracking processors (301) obtain target positions by individually tracking video data output from the receivers (11 to 14), respectively. The correlation processor (302) extracts a combination of echo signals from the same target based on a correlation relationship between a position of the transmitting antenna (101), positions of the receiving antennas (111) of receivers (11 to 14), and target positions.