Radar Frequency Stitching with Overlapped Channel Transmission
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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 and stationary targets.
Innovation Solution
The channel sequence is divided into multiple portions and transmitted over multiple transmitters with overlapping time periods, reducing coherence time and relaxing 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 existing techniques to achieve large effective bandwidth, then sensing performance is improved, but coherence time requirements become stringent and antenna design complexity increases
Solution Approach 1:
The channel sequence is divided into multiple portions (first portion and second portion) that are transmitted at different times. This segmentation allows the radar system to achieve frequency stitching with reduced coherence time requirements and relaxed antenna bandwidth constraints, as each portion can be transmitted independently over overlapping time periods using multiple transmitters
2Measurement precision
If existing frequency stitching techniques are used to achieve large effective bandwidth, then detection accuracy is improved, but system costs increase due to stringent implementation requirements
Solution Approach 1:
The system uses multiple transmitters to send different portions of the channel sequence over overlapping time periods, creating a dynamic transmission scheme. This dynamic approach reduces the stringent coherence time requirements and relaxes antenna bandwidth constraints, thereby lowering system implementation costs while maintaining detection accuracy
3Quantity of substance
If existing frequency stitching techniques are used, then bandwidth requirements are met, but the system cannot effectively detect faster-moving targets
Solution Approach 1:
By segmenting the channel sequence into multiple portions transmitted over overlapping time periods, the system reduces the total coherence time required for frequency stitching. This shorter coherence time enables the system to effectively track and detect faster-moving targets while still achieving the required large effective bandwidth through combination of the portions
Data Source
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AI summary
A radar system (120) comprising a first transmitter (124) and a first receiver (125), a second transmitter (126) and a second receiver (127) and a processor (122), wherein the processor (122) 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 (124) 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 (126) 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.