Radar Chirp Synchronization Using Embedded Binary Codes
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Solution Overview
Problem
Existing radar transceiver systems face challenges in achieving synchronization between the transmitter and receiver units without increasing hardware complexity, which is crucial for accurate measurement and detection of radar signals.
Innovation Solution
A radar transceiver arrangement that generates and transmits a predetermined binary code within each delay time of radar waveforms, using BFSK modulation, allowing for correlation and synchronization between the transmitter and receiver units through software-based methods, reducing the need for additional hardware triggers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an additional synchronization/triggering signal in hardware is used, then the receiver knows what digital samples can be associated with the beginning and end of each chirp, but the hardware complexity increases
Solution Approach 1:
The patent replaces the hardware synchronization signal approach with a software-based correlation method. The receiver correlates the received radar signal with stored reference chirp waveforms to automatically identify sample boundaries, eliminating the need for additional hardware triggering mechanisms while maintaining synchronization accuracy.
Solution Approach 2:
The system uses the radar signal itself to provide synchronization information. By embedding synchronization data within the radar waveforms and using correlation processing, the receiver self-synchronizes without requiring external triggering signals or additional hardware complexity.
2Adaptability or versatility
If multiple consecutive chirps are transmitted in FMCW format, then wide band performance is achieved, but the complexity of tracking and synchronizing each chirp increases
Solution Approach 1:
The patent performs preliminary correlation processing between received chirps and reference waveforms to pre-establish synchronization information before the main detection phase. This allows the system to handle multiple consecutive chirps efficiently by reusing the correlation framework rather than requiring separate synchronization tracking for each chirp.
Solution Approach 2:
The correlation processing unit serves multiple functions: it performs synchronization, identifies chirp boundaries, and prepares data for detection. This multi-functional approach reduces the overall complexity of handling multiple consecutive chirps in FMCW mode by consolidating tasks into a single processing framework.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables accurate synchronization and reduces hardware complexity by embedding binary codes in radar signals, facilitating efficient data processing and enhancing robustness against fading effects in multi-target scenarios.
Implementation Method 1
the binary code is of the type BFSK, Binary Frequency Shift Keying, where the digital signs in the binary code vary between two different frequencies in a frequency span
Implementation Method 2
The correlation unit is adapted to perform a correlation calculation between the digital IF signal and the original binary code provided by the code generator unit such that a correlation function is obtained
Implementation Method 3
The receiver unit comprises a mixer unit adapted to mix the transmitted radar signal with the received radar signal and to output an analogue intermediate frequency, IF, signal
Implementation Method 4
The receiver unit further comprises an analogue to digital converter, ADC, unit adapted to output a digital IF signal
Data Source
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AI summary
The present disclosure relates to a radar transceiver arrangement (101)) comprising a control unit (107), a transmitter unit (140) and a receiver unit (141). The transmitter unit (140) is adapted to generate and transmit a radar signal (108) comprising a plurality of subsequent radar waveforms (r) with a delay time (tD) between each radar waveform (r), and the receiver unit (141) is adapted to receive reflected radar signals (109). For at least a subset of the transmitted radar waveforms (r), the radar transceiver arrangement (101) is adapted to generate and transmit a predetermined binary code (300) within each delay time (tD), the binary code (300) being comprised in the transmitted radar signal (108).