Costas Array Resource Configuration for Precise Radar Sensing
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Solution Overview
Problem
Existing radar signals suffer from large ranging errors and sidelobe interference, particularly in multi-target environments, leading to poor signal sensing performance due to coupling between Doppler frequency shift and distance, and ambiguity function sidelobes covering mainlobes of smaller targets.
Innovation Solution
The use of Costas arrays to configure resources for signal transmission, which have a special sequence structure resulting in a 'pin-shaped' ambiguity function, improving signal resolution by ensuring a high and sharp main peak and low, flat sub-peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a common radar signal (LFM signal) is used, then the signal can be transmitted, but a coupling between Doppler frequency shift and distance occurs, resulting in large ranging errors
Solution Approach 1:
The patent changes the signal parameters from conventional LFM to Costas array-based frequency hopping sequences. The Costas array provides a specific permutation of frequency hops that creates a pin-shaped ambiguity function, decoupling the Doppler-frequency relationship and eliminating the harmful coupling effect while improving ranging precision.
2Object-generated harmful factors
If a nonlinear frequency modulation signal is used, then the sidelobe level of autocorrelation function is improved, but a large range sidelobe remains on high Doppler frequency section, causing sidelobe interference
Solution Approach 1:
The patent employs Costas array frequency hopping sequences that fundamentally change the spectral characteristics. The Costas array construction guarantees a pin-shaped ambiguity function with suppressed sidelobes across all Doppler frequencies, eliminating the high-Doppler range sidelobes that cause interference in conventional NLFM signals.
Solution Approach 2:
The frequency spectrum is segmented into discrete frequency hops according to the Costas array permutation. This segmentation creates distinct, isolated spectral components that prevent sidelobe leakage and interference between different target responses, even in multi-target environments.
3Reliability
If conventional radar signals are used in multi-target environments, then signal transmission is possible, but synthesis of sidelobes covers mainlobes of smaller targets, leading to poor sensing performance
Solution Approach 1:
The patent transforms the signal parameters to Costas array-based frequency hopping, which creates a pin-shaped ambiguity function. This parameter change ensures that the mainlobe remains sharp and isolated while sidelobes are suppressed to negligible levels, preventing sidelobe coverage of smaller target mainlobes and improving both reliability and precision in multi-target scenarios.
Data Source
AI summary
This application discloses a resource configuration method, a resource determining method and apparatus, a communication device, and a storage medium, and belongs to the field of communication technologies. The resource configuration method in embodiments of this application includes: configuring, by a signal sending node, a first resource based on a predetermined first array, where the first array includes at least one Costas array or at least one Costas array set, and each Costas array set includes at least one Costas array; and sending, by the signal sending node, a first signal by using the first resource.