Radar Target Simulator Using Independent ADC and DAC Sampling Rates
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Solution Overview
Problem
Current radar target simulators are complex, expensive, and produce inexact simulations due to multiple error sources, making them unsuitable for reliably testing automobile radars.
Innovation Solution
A radar target simulator using analogue-to-digital and digital-to-analogue converters with different sampling rates to simulate moving targets, allowing continuous alteration of distance and realistic modeling of speed and acceleration, while maintaining low complexity and cost efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a radar target simulator uses multiple oscillators (S, C, X band) to simulate radar targets, then it can simulate multiple frequency bands, but the device complexity increases and manufacturing precision decreases due to multiple error sources
Solution Approach 1:
The patent uses a single oscillator that can be tuned to different frequencies to replace multiple dedicated oscillators. The frequency synthesis unit generates different carrier frequencies (S, C, X bands) from one main oscillator, making the simulator universal across multiple frequency bands while reducing device complexity and eliminating multiple error sources associated with separate oscillators.
Solution Approach 2:
The patent combines multiple functions (frequency generation, modulation, target simulation) into a unified system architecture. By merging the frequency synthesis, signal modulation, and target simulation functions into one integrated system rather than separate modules, the overall device complexity is reduced while maintaining the ability to simulate multiple frequency bands.
2Ease of manufacture
If the sampling rate of the digital-to-analogue converter is fixed relative to the analogue-to-digital converter, then the system is simpler to implement, but the distance between radar targets cannot be continuously altered without jumping
Solution Approach 1:
The patent introduces a dynamic sampling rate adjustment mechanism where the digital-to-analogue converter's sampling rate can be independently varied relative to the analogue-to-digital converter. This dynamic adjustment allows continuous modification of the simulated target distance by changing the sampling rate ratio, eliminating distance jumps while maintaining system implementability through controlled rate variation.
Solution Approach 2:
The patent changes the sampling rate parameter of the digital-to-analogue converter to achieve continuous distance simulation. By adjusting the sampling rate as a variable parameter rather than fixing it, the system can continuously alter the simulated target distance without discrete jumps, improving precision while keeping the implementation manageable through parameter control.
3Measurement precision
If the radar target simulator uses complex signal processing to achieve high simulation precision, then the measurement precision improves, but the device complexity and production cost increase
Solution Approach 1:
The patent replaces complex mechanical signal processing systems with a digital signal processing approach. By using digital modulation techniques and software-based signal generation, the system achieves high simulation precision without the complexity of analog signal processing circuits, reducing both device complexity and production costs while maintaining measurement precision.
Data Source
AI summary
A radar target simulator for simulating radar targets is provided. The radar target simulator has an analogue-to-digital converter having a first clock generator and a digital-to-analogue converter having a second clock generator. The analogue-to-digital converter is configured to receive a radar signal transmitted by a radar system as an input signal, while the digital-to-analogue converter is configured to return an output signal to the radar system for simulation of the radar target. Further, the first and the second clock generator are configured to operate the analogue-to-digital converter and the digital-to-analogue converter at a different sampling rate in each case.