Radar Phase Lock Loop Switching for Automotive Collision Warning
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Solution Overview
Problem
Automotive radar systems face challenges in determining steady and moving objects, recognizing multiple and false objects, and achieving high measurement accuracy while maintaining a complex system structure, which hinders their effectiveness in pre-warning collision scenarios.
Innovation Solution
A radar system incorporating a transmitting device with a reference frequency source, direct-digital synthesizer, phase lock loop, and loop switch module, along with receiving devices, that can switch between closed and open loop modes to enhance frequency synchronization and simplify system processing, and a control method that adjusts signal emission based on distance thresholds to optimize detection accuracy and range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a complex system structure is used to achieve high measurement accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the radar system into distinct functional modules: transmitting device with phase lock loop, receiving device with signal processing unit, and control unit. Each module performs a specific function, allowing for independent optimization and simplification while maintaining overall measurement accuracy through coordinated operation of the segmented components.
Solution Approach 2:
The patent introduces a phase lock loop as an intermediary component between the frequency source and the transmitting antenna. This intermediary stabilizes the frequency and phase of the transmitted signal, improving measurement accuracy without requiring complex signal processing in the receiving end, thus simplifying the overall system structure.
2Measurement precision
If signal processing complexity is increased to improve detection accuracy, then measurement precision is improved, but processing time increases
Solution Approach 1:
The patent performs preliminary frequency stabilization and signal conditioning in the transmitting device using a phase lock loop before the signal is transmitted. This preliminary action ensures that the transmitted signal has stable frequency and phase characteristics, reducing the amount of complex processing required at the receiving end and thereby decreasing processing time while maintaining detection accuracy.
Solution Approach 2:
The patent replaces complex mechanical signal processing mechanisms with electronic signal processing approaches. By using digital signal processing and electronic filtering in the receiving device, the system achieves high detection accuracy with faster processing speeds compared to traditional mechanical or analog processing methods.
Data Source
AI summary
A radar system comprises a transmitting device comprising a reference frequency source, for generating a reference frequency signal; a direct-digital synthesizer, coupled to the reference frequency source, for generating a synthesized frequency signal according to the reference frequency signal; a phase lock loop, coupled to the direct-digital synthesizer, for converting the synthesized frequency signal to an output signal; a transmitting antenna, coupled to the phase lock loop, for emitting the output signal to the air; and a loop switch module, coupled to the phase lock loop, for switching the phase lock loop between an open loop mode and a closed loop mode; and at least one receiving device, for receiving at least one wireless signal, and processing the at least one wireless signal according to the output signal generated by the phase lock loop.