Vehicular Radar Coexistence with Satellite Observation

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Solution Overview

Problem

The increasing number of vehicular radar systems operating in shared frequency bands with passive satellite observation systems leads to interference, compromising the accuracy of satellite readings and potentially causing performance degradation in radar systems.

Innovation Solution

A system and method that determine if a radar system is within a satellite's geographical observation region and modify its operation by inhibiting signal emissions, reducing power, adjusting duty cycles, or changing antenna beam patterns to minimize interference, using satellite orbital paths and sensor parameters to calculate geographical mitigation regions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If transmitters operate in frequency bands shared with satellite observation systems, then transmitter productivity and coverage are improved, but satellite measurement precision deteriorates due to interference

Engineering Contradiction:

Improvetransmitter operation capabilityVSAvoidsatellite reading accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The transmitter dynamically adjusts its operational parameters (power level, duty cycle, frequency) based on real-time satellite observation schedules and geographical location. The system transitions between different transmission states (full power, reduced power, muted) to accommodate satellite pass times, thereby resolving the contradiction between maintaining transmitter productivity and protecting satellite measurement precision.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes transmission parameters including power output, duty cycle percentage, and frequency selection based on satellite observation windows. By modulating these parameters dynamically during satellite passes, the transmitter reduces interference while minimizing impact on its own operational effectiveness, thus balancing both competing requirements.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If transmitters reduce power or inhibit emissions to avoid satellite interference, then satellite measurement precision is improved, but transmitter productivity deteriorates

Engineering Contradiction:

Improvesatellite reading accuracyVSAvoidradar system effectiveness

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The transmitter implements periodic transmission patterns synchronized with satellite observation schedules. During non-observation periods, the transmitter operates at full productivity. During satellite pass periods, it temporarily reduces or mutes transmissions. This periodic modulation ensures satellite measurement precision while minimizing overall impact on transmitter productivity through strategic timing.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

Instead of completely shutting down during satellite passes, the transmitter applies partial action by reducing power to a controlled level or inhibiting emissions only during specific duty cycle portions. This partial mitigation approach provides sufficient protection for satellite measurements while maintaining adequate transmitter productivity for critical operations.

Inventive Principle:

Principle #16Partial or excessive action

3Measurement precision

If transmitters continuously monitor satellite positions and adjust operations, then satellite measurement precision is maintained, but device complexity increases

Engineering Contradiction:

Improvesatellite observation accuracyVSAvoidtransmitter control system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The system introduces an intermediary control module that receives satellite ephemeris data, calculates geographical mitigation regions, and generates transmission control commands. This intermediary layer simplifies the overall system architecture by centralizing the complex calculations and decision-making logic, separating the complex satellite tracking function from the relatively simple transmitter control function.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system performs preliminary calculations of satellite passes and pre-determines transmission inhibition windows before they occur. By calculating geographical mitigation regions and scheduling transmission adjustments in advance based on known satellite orbits, the system reduces real-time computational complexity while maintaining measurement precision through proactive rather than reactive control.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20240168173A1Terrestrial transmitter coexistence with satellite operations

Publication Date: 2024.05.23 NXP BV

AI summary

A system includes a transmitter configured to emit a signal. The system includes a control system, configured to determine a geographical mitigation region of a satellite, determine the transmitter is located within the geographical mitigation region, and modify an operation of the transmitter to mitigate interference with an observation sensing activity of the satellite.