Radar Reception Device STC Adjustment via Simultaneous A- and PPI-Scope Display
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Solution Overview
Problem
Current radar systems face challenges in adjusting Sensitivity Time Control (STC) settings to effectively display radar images, making it difficult to distinguish between target echoes and clutter, requiring trial-and-error adjustments without instant feedback on the appropriateness of the settings.
Innovation Solution
A radar reception device with a signal processor that acquires and processes signals in an Rθ-coordinate system, converting them into an XY-orthogonal coordinate system for PPI-scope generation, while simultaneously displaying unprocessed signals in an A-scope format, allowing users to adjust threshold curves interactively and visualize the effects on the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If STC adjustment is performed by trial-and-error while looking at the radar image, then the radar image can be displayed with clutter eliminated, but the adjustment process becomes time-consuming and cannot evaluate instantly whether only clutter is eliminated and target echo is remained
Solution Approach 1:
The patent applies feedback by displaying the reception signal level in A-scope format alongside the PPI-scope radar image. This provides immediate visual feedback to the operator about the reception signal levels at different distances, enabling instant evaluation of whether STC adjustment is eliminating only clutter while preserving target echo. The operator can see the effect of STC adjustment in real-time without trial-and-error
Solution Approach 2:
The patent adds another dimension to the display by incorporating A-scope format (showing reception signal level versus distance) alongside the traditional PPI-scope radar image. This additional dimensional information about signal levels enables operators to make accurate STC adjustments by visualizing the relationship between distance and signal strength, rather than relying on trial-and-error with the radar image alone
2Measurement precision
If the level of reception signal is adjusted according to distance to make radar image viewable, then far distance targets become visible, but close distance targets may be over-suppressed and important targets may be eliminated with clutter
Solution Approach 1:
The A-scope display provides immediate feedback showing the reception signal levels at different distances. Operators can see which signal levels correspond to clutter and which correspond to target echo, enabling precise adjustment of STC characteristics to preserve target echo while suppressing clutter. This feedback mechanism ensures accurate discrimination between targets and clutter
Solution Approach 2:
The system performs preliminary analysis by displaying the reception signal levels in A-scope format before final STC adjustment is applied to the PPI-scope image. This preliminary visualization allows operators to identify the signal level characteristics of both clutter and targets, and set appropriate STC thresholds that will preserve targets while eliminating clutter in the final display
Data Source
AI summary
A radar reception device is provided. The device includes a reception signal acquirer, a signal processor, a PPI-scope generator, an A-scope generator, a display output unit, and a user interface. The reception signal acquirer acquires, in an Rθ-coordinate system, a reception signal received by an antenna that rotates at a predetermined cycle. The signal processor performs signal processing on the reception signal in the Rθ-coordinate system according to a distance, and outputs the processed signal in the Rθ-coordinate system. The PPI-scope generator converts the processed signal from the Rθ-coordinate system into an XY-orthogonal coordinate system and generates a radar image in a PPI-scope. The A-scope generator generates a radar image where the reception signal before being signal-processed is illustrated in an A-scope. The display output unit displays the PPI-scope radar image and the A-scope radar image on a display unit simultaneously. The user interface accepts a user input.