Radar Distance and Speed Determination via Simultaneous Frequency Ramps
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Solution Overview
Problem
Existing radar systems have a limited unambiguous range and signal-to-noise ratio for determining radial speed, which reduces the accuracy and quality of distance and speed measurements.
Innovation Solution
Emitting both first and second frequency ramps simultaneously instead of alternately, allowing for doubled sampling frequency and increased unambiguous range, while using a two-dimensional FFT to generate a range-Doppler matrix and calculating Doppler frequencies from mixed signals with known frequency offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequency ramps are emitted alternately to increase unambiguous range, then the unambiguous range increases, but the sampling frequency decreases and signal-to-noise ratio deteriorates
Solution Approach 1:
The patent merges the emission of first and second frequency ramps into a simultaneous transmission process. By combining the ramps in time rather than separating them alternately, the system achieves both high sampling frequency (through increased number of ramps per cycle) and high unambiguous range (through multiple Doppler frequency measurements), resolving the contradiction between these two parameters.
2Measurement precision
If frequency ramps are emitted alternately to increase unambiguous range, then the unambiguous range increases, but the signal-to-noise ratio decreases
Solution Approach 1:
The patent combines multiple frequency ramps (both first and second ramps) within a single measurement cycle, increasing the total number of ramps from 128 to 256 per cycle. This merging approach maintains high signal-to-noise ratio through increased signal accumulation while simultaneously achieving extended unambiguous range through multiple Doppler frequency measurements.
3Reliability
If the number of ramps per cycle is increased to improve signal-to-noise ratio, then the signal-to-noise ratio improves, but the unambiguous range decreases
Solution Approach 1:
The patent segments the frequency ramps into two distinct types (first frequency ramps and second frequency ramps) with different carrier frequencies. This segmentation allows the system to process ramps in parallel groups, increasing the total number of ramps per cycle for improved signal-to-noise ratio while using the frequency difference between segments to extend the unambiguous range through multiple Doppler measurements.
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 significantly enhances the unambiguous range and signal-to-noise ratio of Doppler frequency measurements, improving the accuracy and quality of distance and speed determinations without increasing computing effort.
Implementation Method 1
emitting first transmission signals, which are radar radiation in the form of first frequency ramps
Implementation Method 2
detecting two Doppler frequencies, which originate from the radial speed of the object
Implementation Method 3
mixing the received signals with the first or second transmission signals to create mixed signals
Data Source
AI summary
The invention relates to a method for determining the distance and radial speed of an object relative to a measuring point, wherein the method comprises the following steps:a) emitting first transmission signals, which are radar radiation in the form of first frequency ramps,b) emitting second transmission signals, which are radar radiation in the form of second frequency ramps, wherein the second frequency ramps are different to the first frequency ramps,c) receiving received signals, which are first and second transmission signals reflected at the object,d) mixing the received signals with the first or second transmission signals to create mixed signals,e) creating a range-Doppler matrix using the mixed signals,f) detecting two Doppler frequencies, which originate from the radial speed of the object, andg) evaluating the Doppler frequencies and/or phase information of the mixed signals, such that ambiguities are eliminated when determining the radial speedwherein the first transmission signals and the second transmission signals are emitted at the same time.