MIMO Radar Spread Spectrum Jamming Resistance
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Solution Overview
Problem
Automotive radar systems face interference from radar signals, hindering their ability to sense targets effectively due to channel noise and jamming, which is exacerbated by the growing number of vehicles equipped with radar functions on the roads.
Innovation Solution
A MIMO antenna array that transmits and receives spread-spectrum encoded signals, resistant to jamming, using pseudorandom code to provide processing gain and overcome channel noise, enabling accurate time delay estimation and target detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If more automobiles with radar functions are deployed on the roads, then the coverage and utility of radar networks increase, but radar signal interference and jamming worsen
Solution Approach 1:
The patent applies spread spectrum coding to radar signals, transforming the signal parameters by modulating with pseudorandom sequences. This spreads the signal energy across a wider frequency band and time duration, making the signal resistant to narrowband interference and jamming while maintaining detectability through correlation processing
Solution Approach 2:
The patent converts the harmful effect of signal interference into a beneficial feature by using spread spectrum techniques that intentionally spread signal energy across wide bandwidths. The low power spectral density of spread spectrum signals makes them appear as background noise to interferers, while the receiving radar can recover the original signal through de-spreading correlation, effectively turning potential interference into a robust communication medium
2Reliability
If spread spectrum encoding is applied to radar signals, then resistance to jamming and channel noise improves, but signal processing complexity increases
Solution Approach 1:
The patent uses pseudorandom coding sequences that are copied and transmitted across the radar signal. The receiving end has an identical copy of the code sequence stored, allowing it to correlate with the received signal and extract the target information. This copying approach enables simple implementation at both transmitter and receiver, reducing overall system complexity while maintaining high jamming resistance
Solution Approach 2:
The patent employs periodic pseudorandom code sequences with known repetition patterns. This periodic structure allows the receiver to use coherent integration over multiple code periods, improving signal-to-noise ratio through accumulation while maintaining manageable processing complexity through the predictable temporal structure of the spread spectrum signal
Data Source
AI summary
A method of implementing spread spectrum techniques in an automotive radar with wireless communication capabilities enables an anti-jammer radar capable of overcoming channel noise. The method is provided with a MIMO radar and at least one base station. The MIMO radar transmits the initial uplink signal and receives an ambient signal containing a reflected uplink signal and the downlink signal. The initial uplink signal is encrypted to overcome channel noise and jamming signals. The downlink signal is used to establish wireless communication between the base station and the MIMO radar. As such, the downlink signal is filtered and processed from the ambient signal. Similarly, the reflected downlink signal is also filtered from the ambient signal. Finally, the MIMO radar decrypts the reflected uplink signal to detect a plurality of targets and derive spatial positioning data for each target.