MIMO Radar Space-Time Block Coding for Cross-Correlation Cancellation
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Solution Overview
Problem
Radar systems face challenges in distinguishing between moving targets and stationary objects due to cross-correlation noise, leading to false detections or missed targets, which existing technologies have not adequately addressed.
Innovation Solution
Implementing space-time block codes in MIMO radar systems to achieve transmitter orthogonality through complementary complex sequences, ensuring complete cancellation of cross-correlation noise and enhancing target estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional radar signals are transmitted without space-time block codes, then the radar system can operate with simpler transmission, but cross-correlation noise from stationary objects cannot be effectively cancelled, leading to false detections
Solution Approach 1:
The patent applies parameter changes by modifying the transmission signal characteristics through space-time block codes. Specifically, it changes the code structure from conventional sequences to complementary complex sequences with orthogonal properties, transforming the signal parameters to enable cross-correlation noise cancellation while maintaining detection accuracy
Solution Approach 2:
The patent converts the harmful cross-correlation noise from stationary objects into a beneficial signal processing opportunity. By using complementary complex sequences with specific orthogonal properties, the system processes the received signals through matched filtering that exploits the noise structure, transforming what was previously harmful interference into cancellable components that improve target detection reliability
2Productivity
If orthogonal waveforms are used on different transmit antennas to achieve fast illumination, then transmission speed and angular resolution are improved, but cross-correlation side lobes cause energy leakage between transmit antennas, increasing noise level and decreasing dynamic range
Solution Approach 1:
The patent changes the waveform parameters by implementing complementary complex sequences instead of conventional orthogonal waveforms. This parameter modification ensures that the cross-correlation between different transmit antenna signals is exactly zero at all delays, eliminating energy leakage while preserving fast illumination capability and improving dynamic range through complete cross-correlation noise cancellation
Solution Approach 2:
The patent applies local quality by ensuring that each transmit antenna uses a specifically designed complementary complex sequence tailored to its position in the MIMO array. This localized sequence design optimizes the cross-correlation properties for each antenna pair, preventing energy leakage at specific delay positions while maintaining overall system productivity and measurement precision
Data Source
AI summary
A radar system comprises a plurality of transmit antennas that transmit a radar signal toward a target, wherein each transmit antenna transmits its signal using a different space-time block code in a given transmission time slot. In one embodiment, no two transmit antennas transmit using the same space-time block code in the same transmission time slot.