Radar System and Method for Operating a Radar System

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This patent discloses an improved radar system and the corresponding operating method, especially for primary radar applications, that utilizes multiple transmission signals and corresponding varied baseband signals. The key innovation is that sampled signals (baseband signals) are digitized at differing sampling rates (or with different sweep rates in some variants), and can be processed efficiently to minimize ambiguities in target speed and distance determination. These variations help to mitigate interference between radars and improve precision, especially in environments with multiple targets or strong risk of signal overlap (e.g. automotive radar, MIMO radar setups). The invention also describes processing techniques for such variably-sampled signals.

Use CasesContent extracted from patent full text and abstract with AI.

• Automotive radar systems for advanced driver assistance systems (ADAS) and autonomous vehicles to better detect speed and distance of multiple moving objects.
• Railway and aviation radar for accurate tracking of fast-moving objects and reduction of ambiguity in velocity measurements.
• Industrial automation and robotics, where precise object detection and velocity measurement are needed in cluttered or complex environments.
• MIMO (multiple-input, multiple-output) radar applications to allow simultaneous transmission and reception across multiple channels without interference.
• Household, security, or surveillance radars that must operate reliably in environments with high potential interferences from similar systems nearby.

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• Allows accurate and unambiguous measurement of both distance and velocity for detected targets, even with typical hardware sweep durations and in environments with significant interference or overlapping targets.
• Improves radar system resilience against mutual interference, which is especially important in automotive and crowded domains.
• Enables efficient signal processing (including the use of fast Fourier transformations) even with non-identical signal modulation and sampling schemes, preserving low power and cost.
• Supports simultaneous multi-channel radar operation (MIMO setups), improving spatial resolution and reducing crosstalk between channels.
• Facilitates more robust and flexible radar design, as sweep- and sampling-rate diversity reduces aliasing and ambiguity effects inherent in standard FMCW radar.

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Patent Abstract

The invention relates to a radar system, in particular a primary radar system, comprising at least one signal generating device (SGEN), which is configured to generate and to emit a transmitting signal sequence, at least one signal detection device, which is configured to receive and to detect a receiving signal sequence reflected on an object structure, at least one mixer (MIX) for mixing the receiving signal sequence with the transmitting signal sequence and for forming N baseband signals sb (n, t), where n = 1...N, and at least one scanning device (ADC), which is configured to scan the N baseband signals at scanning frequencies fs(n), wherein at least two, preferably at least three, further preferably all of the N scanning frequencies fs(n) differ from each other.