Radar Frequency Stitching with Overlapping Multi-Transmitter Channels
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Solution Overview
Problem
Existing frequency stitching techniques in radar systems impose stringent requirements on system implementation, particularly in coherence time and antenna design, limiting performance and increasing costs due to the need for large effective bandwidth.
Innovation Solution
The channel sequence is divided into multiple portions and transmitted over multiple transmitters with overlapping time periods, reducing coherence time and antenna bandwidth requirements, allowing for faster target detection and less complex antenna design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequency stitching is performed using a single transmitter to achieve large effective bandwidth, then sensing performance (signal-to-noise ratio) is improved, but coherence time requirements become stringent and system complexity increases
Solution Approach 1:
The patent divides the frequency stitching task into segments by assigning different portions of the frequency spectrum to different transmitters. Each transmitter handles a subset of channels, reducing the coherence time requirement for each individual transmitter while maintaining the overall large effective bandwidth through combination of multiple transmitters' contributions.
2Measurement precision
If frequency stitching is performed to achieve large effective bandwidth, then detection accuracy is improved, but antenna design complexity and costs increase
Solution Approach 1:
The patent segments the frequency bandwidth and assigns different frequency portions to different transmitters. This means each transmitter only needs to support a portion of the total bandwidth rather than the full bandwidth, simplifying the antenna design requirements for each individual transmitter while achieving the desired large effective bandwidth through system-level combination.
3Duration of action of moving object
If multiple transmitters are used with overlapping time periods, then coherence time is reduced and system flexibility is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple transmitters working in parallel with overlapping time periods to achieve the desired frequency stitching. The processors coordinate the multiple transmitters to transmit on different frequency portions simultaneously or with overlapping time periods, reducing coherence time requirements while the combined system achieves the full effective bandwidth.
Data Source
AI summary
A radar system comprising a first transmitter and a first receiver, a second transmitter and a second receiver and a processor, wherein the processor is configured to determine a channel sequence for frequency stitching; divide the channel sequence into a first portion and a second portion; instruct the first transmitter to transmit, over a first time period, an RF signal on each RF channel of the first portion of the channel sequence; instruct the second transmitter to transmit, over a second time period, an RF signal on each RF channel of the second portion of the channel sequence, wherein the second time period at least partially overlaps with the first time period; and generate a frequency-stitched channel impulse response from reflected RF signals received at each receiver in response to the RF signals transmitted.