Radar Disturbance Removal via Frequency Band Switching
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Solution Overview
Problem
Conventional radar apparatuses face difficulties in removing interference signals from other radar systems, particularly in pulse compression radar systems, due to differing modulation modes and pulse widths, which complicates the identification and removal of interference signals.
Innovation Solution
A disturbance signal removing device that switches the transmission frequency band of modulated pulse signals to prevent alignment with interference signals from other radar systems, using a transmission frequency setter to select from multiple frequency bands and alternate between them, ensuring that interference signals are not continuously aligned with the radar's own transmission frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the radar apparatus uses pulse compression with modulated pulse signals to improve signal-to-noise ratio, then the S/N ratio is improved, but interference signals from other radar systems become more difficult to remove due to differing modulation modes and pulse widths
Solution Approach 1:
The patent changes the transmission frequency band parameter dynamically by switching between multiple frequency bands for modulated pulse signals. This prevents continuous alignment with interference signals from other radar systems, solving the interference removal difficulty while maintaining the pulse compression S/N ratio improvement
2Length of moving object
If the radar apparatus transmits modulated pulse signals with long pulse widths for pulse compression, then the detection range is extended, but interference signals appear elongated in the distance direction and cannot be properly removed by simple intensity comparison
Solution Approach 1:
The patent dynamically changes the transmission frequency band parameter by switching between multiple frequency bands. This prevents interference signals from maintaining consistent alignment across sweeps, allowing proper interference removal even when interference signals appear elongated due to long pulse width transmission
3Object-generated harmful factors
If the radar apparatus compares reception data of adjacent sweeps to remove interference signals, then interference signals can be removed when they appear at random locations, but the method fails when interference signals continuously align with the radar's transmission frequency band
Solution Approach 1:
The patent implements periodic switching between multiple transmission frequency bands. This creates a periodic pattern where interference signals from other systems will not continuously align with the radar's transmission bands, ensuring that adjacent sweep comparison methods remain effective for interference removal
Solution Approach 2:
The patent dynamically changes the transmission frequency band parameter by switching between multiple frequency bands. This prevents continuous alignment with interference signals, making the interference removal method reliable even when interference signals persist across multiple sweeps
Data Source
AI summary
A disturbance signal removing device is provided. The device includes an antenna for transmitting a modulated pulse signal and a non-modulated pulse signal, and a transmission frequency setter for selectively setting as a transmission frequency band of the modulated pulse signal any one of a plurality of mutually different frequency bands of the modulated pulse signal that are different from a transmission frequency band set to the non-modulated pulse signal. The transmission frequency setter switches between the plurality of transmission frequency bands of the modulated pulse signal.