Distributed Radar Antenna Layout for Cable Delay Separation
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Solution Overview
Problem
Distributed MIMO radar systems face challenges in achieving time synchronization due to varying transmission delays in cables and spatial paths between antennas, which affect delay estimation accuracy.
Innovation Solution
The system ensures time synchronization by configuring transmit and receive antennas with specific distance and cable length ratios, allowing separation of cable and spatial path delays through phase difference calculations, using terahertz active cables (TACs) for improved angular resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If cables are used to connect distant transmit antennas to the control unit, then the radar system can achieve distributed antenna configuration with extended coverage, but transmission delays in cables cause time synchronization errors
Solution Approach 1:
The patent changes the cable length parameter to create a specific ratio relationship with spatial distances between antennas. By setting cable lengths such that L1/L2 > d1/d2, the system transforms the cable transmission delay from a harmful factor into a measurable parameter that can be separated and compensated for in the delay estimation process.
2Productivity
If traditional delay estimation methods are used in distributed MIMO radar, then the system can operate with multiple antennas, but cable transmission delays cannot be separated from spatial path delays, reducing delay estimation accuracy
Solution Approach 1:
The patent segments the total transmission delay into two distinct components: cable transmission delay and spatial path delay. By using the non-proportional cable length ratio condition, the system creates independent equations for each delay component, allowing them to be solved separately through the phase difference measurements from multiple antenna pairs.
Solution Approach 2:
The patent introduces cable length ratio as an intermediary parameter that enables the separation of mixed delay components. This ratio relationship serves as a constraint condition that provides the additional equation needed to decouple the cable delay from the spatial path delay in the mathematical model.
3Measurement precision
If antennas are distributed with specific spacing to achieve resolution requirements, then angular resolution improves, but the varying distances to control unit create unequal cable delays
Solution Approach 1:
The patent transforms the cable delay management problem from a complexity issue into a parameter relationship issue. By establishing a specific ratio relationship between cable lengths and spatial distances, the system converts the management of varying delays into a mathematical constraint that enables accurate delay estimation rather than complicating the system.
Data Source
AI summary
A distributed radar includes a control unit, a receive antenna, and N transmit antennas. The N transmit antennas include a first transmit antenna, a second transmit antenna, and a third transmit antenna. There are a first distance between the first transmit antenna and the second transmit antenna, and a second distance between the first transmit antenna and the third transmit antenna, and the first distance is shorter than the second distance. The second transmit antenna is connected to the control unit by using a first cable, the third transmit antenna is connected to the control unit by using a second cable, a ratio of the first distance to the second distance is a first ratio, a ratio of a length of the first cable to a length of the second cable is a second ratio, and the second ratio is greater than the first ratio.