Radar System Common Clock Generator Coherence

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Solution Overview

Problem

Radar systems face challenges in reducing measurement deviations and improving angular resolution, particularly at high frequencies, due to irradiation losses and damping, which are exacerbated by independent HF oscillators and phase-locked loops introducing additional noise components.

Innovation Solution

A radar system with a common clock generator for HF generators, processing signals to increase coherence, and arranging HF generators close to antennas, using phase-locked loops to produce coherent HF signals, and compensating for systematic deviations in signals to enhance measurement accuracy and resolution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If independent HF oscillators and phase-locked loops are used in distributed radar systems, then the system can operate with multiple transmitting-receiving devices, but additional noise components and perturbations are introduced that deteriorate measurement accuracy

Engineering Contradiction:

Improvedistributed radar system operationVSAvoidangular measurement accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent merges the clock generation functions by introducing a common clock generator that supplies clock signals to all HF generators in the distributed radar system. This eliminates the independent oscillators that caused noise and phase instability, while preserving the distributed architecture with multiple transmitting-receiving devices. The common clock source ensures coherent phase relationships across all devices, resolving the contradiction between system distribution and measurement precision.

Inventive Principle:

Principle #5Merging (Combining)

2Measurement precision

If the aperture of radar antennas is increased to improve angular resolution, then measurement deviation is reduced, but the system becomes more complex and suffers from irradiation losses and damping at high frequencies

Engineering Contradiction:

Improveangular resolutionVSAvoidradar electronics complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces traditional mechanical/physical aperture extensions with an electronic coherence approach. Instead of physically larger antennas, the system uses multiple distributed transmitting-receiving devices synchronized by a common clock generator to achieve high angular resolution through signal processing. This substitution reduces physical complexity while maintaining or improving resolution capabilities.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If high transmission frequencies are used to achieve better angular measurement accuracy, then resolution improves, but irradiation losses and damping increase adversely affecting transmission power and signal quality

Engineering Contradiction:

Improveangular measurement accuracyVSAvoidirradiation losses

Core Design Contradiction:

Measurement precisionVSLoss of energy

Solution Approach 1:

The common clock generator acts as an intermediary that enables coherent signal combination across distributed devices. This intermediary allows the system to achieve high measurement accuracy through electronic coherence rather than relying solely on high-frequency transmission, thereby reducing the impact of irradiation losses and damping that plague high-frequency systems.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 improves angular measurement accuracy and resolution by reducing noise components and perturbations, allowing for better separation of weaker targets from stronger ones and optimizing the dynamic range.

Implementation Method 1

using phase-locked loops to produce coherent HF signals

Methodology Applied

Scientific EffectPhase locking:

Implementation Method 2

at least one evaluation device is provided, which is configured to process transmitting and receiving signals of the transmitting-receiving devices to modified measurement signals with increased coherence

Methodology Applied

Scientific EffectSignal coherence processing:

Data Source

PatentUS11353570B2Radar system and method for operating a radar system

Publication Date: 2022.06.07 SYMEO

AI summary

Transmitting-receiving devices, such as within a radar system, can use a clock generator from which various higher-frequency signals are derived. For example, respective transmitting-receiving devices can include high-frequency (HF) generators. The present subject matter concerns a system and a method for providing measurement signals having increased coherence as compared with signals originally transmitted by the transmitting-receiving devices. Such measurement signals can be exchanged for synchronization. Increased coherence can enhance overall system performance, such as to assist in separating returns associated with weaker targets from those associated with stronger targets, or to provide enhanced angular resolution, as illustrative examples.