Radar Waveform Generation Using D/A Error Correction Timing
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Solution Overview
Problem
Conventional waveform generation methods and radar devices suffer from accuracy deterioration due to numeric irregularities in D/A conversion elements, leading to reduced measuring accuracy in distance and velocity measurements, necessitating expensive high-bit-number D/A converters.
Innovation Solution
Generating D/A conversion voltage based on data varied by a minimum conversion unit or its integer multiple, correcting errors caused by numeric irregularities in D/A conversion elements, and providing this voltage to oscillating means to vary the oscillation frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional waveform generation methods are used with regular output levels and predetermined conversion timing, then device complexity is reduced, but waveform accuracy deteriorates due to uncorrected numeric irregularities in D/A conversion elements
Solution Approach 1:
The patent applies preliminary action by pre-measuring the actual D/A conversion characteristics and storing correction data in a lookup table before normal operation. During waveform generation, the system retrieves pre-calculated correction values based on the desired output voltage, eliminating the need for real-time complex calculations and allowing the use of simpler hardware while maintaining high accuracy.
2Measurement precision
If expensive high-bit-number D/A converters are employed to improve measuring accuracy, then waveform accuracy improves, but device cost increases
Solution Approach 1:
The patent creates a digital copy of the D/A converter's actual conversion characteristics through measurement and storage in a lookup table. This digital model allows the system to predict and correct conversion errors without requiring additional physical hardware or higher-resolution D/A converters, achieving high measurement precision with standard components.
3Manufacturing precision
If data are provided to D/A converter input terminals assuming constant voltage values, then ease of operation is improved, but waveform accuracy deteriorates due to uncorrected numeric irregularities
Solution Approach 1:
The patent implements feedback by using the measured actual D/A conversion characteristics to generate correction values that are applied during normal operation. The system continuously references the stored correction data to compensate for numeric irregularities, ensuring accurate waveform generation without requiring complex real-time adjustments or manual calibration.
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
Improves waveform accuracy by correcting errors in D/A conversion voltage, enhancing the measuring accuracy of radar devices without the need for expensive high-bit-number D/A converters.
Implementation Method 1
output levels of a D/A converter are set at regular intervals, and a conversion timing is varied
Implementation Method 2
data obtained by correcting a linearity of an oscillating frequency of VCO occurring due to a non-linearity
Data Source
AI summary
It is possible to generate D/A conversion voltage in which an error generated by numeric irregularities of a D/A conversion element such as resistor constituting a D/A converter 11 is corrected. A waveform generation method characterized in that input data into a D/A converter 11 are provided to the D/A converter in order at a timing at which a voltage of a desired waveform which has D/A conversion data indicating a conversion amount of the input data obtained by varying the input data by a minimum conversion unit or a unit obtained by multiplying the minimum conversion unit by an integer, and which varies with time series, becomes substantially equal to a D/A-converted voltage, whereby the D/A-converted voltage is generated in accordance with the desired waveform.