Radar Receiver Synchronization Testing with Embedded Test Tones
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Solution Overview
Problem
Existing radar systems face challenges in accurately testing time synchronization between receiver channels, particularly in cascaded setups, due to limited signal-to-noise ratio (SNR) and the need for additional wiring or bypassing filters, which can lead to inaccuracies and malfunctions.
Innovation Solution
A radar device and method that utilize a test tone generator to create a constant frequency signal, combined with a chirp signal, to enhance SNR for accurate time synchronization testing between receiver channels, allowing for direct coupling paths and bypassing the need for dedicated loopback paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a test tone generator is used to enhance SNR for time synchronization testing, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The test tone generator is implemented as a second frequency synthesizer that is already embedded in the follower IC, allowing it to serve both as a test tone generator for synchronization testing and as a frequency synthesizer for normal radar operation. This multi-functionality approach improves measurement precision without adding external hardware, thereby avoiding increased device complexity
Solution Approach 2:
The radar device uses its own embedded second frequency synthesizer in the follower IC to generate the test tone signal, rather than requiring an external test equipment. This self-service approach allows the device to perform self-testing and calibration, improving measurement precision while avoiding additional external hardware requirements
2Device complexity
If direct coupling paths are used between test tone generator and receiver channels, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent uses the existing RF signal path and mixer components as intermediaries to couple the test tone generator output to the receiver channels. Instead of creating new direct coupling paths, the test tone signal is routed through the existing RF infrastructure, which maintains signal integrity and measurement precision while avoiding additional complex wiring
Solution Approach 2:
The invention extracts and utilizes the existing RF signal path and mixer components for test tone injection, rather than creating separate dedicated test paths. By taking advantage of the existing infrastructure, the system achieves direct coupling functionality without compromising measurement precision through the use of proven RF components
3Measurement precision
If loopback paths are used for testing, then measurement precision is improved, but device complexity and hardware requirements increase
Solution Approach 1:
The existing RF signal path and mixer components are used for both normal radar operation and test tone injection, eliminating the need for separate dedicated loopback paths. This multi-functionality approach maintains measurement precision by using the same high-quality RF components while avoiding additional hardware requirements
Solution Approach 2:
The radar device uses its own embedded second frequency synthesizer and existing RF infrastructure to perform self-testing, rather than requiring external loopback equipment. This self-service approach achieves accurate synchronization testing without additional hardware beyond what is already embedded in the follower IC
Data Source
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AI summary
In accordance with a first aspect of the present disclosure, a radar device is provided, comprising: a plurality of receiver channels; a plurality of mixers, wherein each of the receiver channels comprises one of said mixers; a first frequency synthesizer configured to generate a chirp signal; at least one test tone generator configured to generate a test tone signal having a constant frequency; wherein said mixers are configured to be fed with said chirp signal and with the test tone signal. In accordance with a second aspect of the present disclosure, a corresponding method of operating a radar device is conceived.