Radar Chirp Scheduling with Frequency-Interval Ratio Control
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Solution Overview
Problem
Conventional radar systems face challenges in reducing peak broadening and relaxing constraints on chirp signals due to the need for precise time adjustments that exceed the capabilities of integrated circuits, leading to stringent parameter adjustments.
Innovation Solution
The radar device adjusts the center frequency of chirp signals monotonically and time intervals linearly over time, maintaining a ratio change rate within an allowable range to avoid non-linearity and relax constraints on other parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If precise time adjustments are made to reduce peak broadening, then measurement precision is improved, but device complexity increases beyond integrated circuit capabilities
Solution Approach 1:
The patent changes the parameter being adjusted from time interval to center frequency. By monotonically varying the center frequency of chirp signals and controlling the ratio change rate of time interval to frequency, the system achieves peak broadening reduction through frequency domain adjustments rather than precise time domain adjustments, which would require complex integrated circuits.
2Measurement precision
If stringent parameter adjustments are made on chirp signals, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent transitions from adjusting time interval parameters to adjusting center frequency parameters. The monotonous variation of center frequency and the controlled ratio change rate provide a more operationally flexible approach that maintains detection precision while reducing the stringency of adjustment constraints compared to precise time interval control.
Solution Approach 2:
The system dynamically adjusts the center frequency of chirp signals in a monotonic manner while controlling the ratio change rate. This dynamic parameter adjustment approach allows for adaptive optimization of target detection precision without requiring fixed stringent constraints on all parameters, improving ease of operation.
Data Source
AI summary
A radar device comprises at least one of a circuit and a processor with a memory containing executable program code. The device transmits, in each cycle, signal sets each with at least one chirp signal, whose center frequency monotonically changes and whose transmission interval varies linearly over time. The device acquires data of reflected chirp signals from targets in the environment. A frequency rate of change is defined as the relative change in center frequency versus a reference, while a time rate of change is defined as the relative change in interval versus a reference. The ratio change rate denotes the change ratio between these rates. The transmission of signal sets is regulated so that the ratio change rate remains within an allowable range during a designated time period.