Narrow-band Radar Orthogonal Code Spread Modulation
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Solution Overview
Problem
Traditional radar devices face challenges in accurately detecting the location and speed of targets due to increased interference from multiple targets, jamming signals, and thermal noise, especially with wide-band signals, which also complicate the transmitter/receiver complexity.
Innovation Solution
A narrow-band radar device employing an orthogonal code generator and a pseudo-noise code generator to spread-modulate transmission data, allowing for precise demodulation of reception signals and calculation of target location and speed, while reducing noise and jamming signal influence through orthogonal and pseudo-noise code processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wide-band transmission signal is used, then the radar device can cover a broader frequency range, but the measurement precision of target location and speed deteriorates due to increased thermal noise and jamming signal susceptibility
Solution Approach 1:
The patent segments the wide-band signal into multiple narrow-band frequency components, each processed independently through correlation operations. This allows the radar to maintain the broad frequency coverage advantage while achieving narrow-band processing precision for each frequency component, thereby resolving the contradiction between wide bandwidth and measurement accuracy
Solution Approach 2:
The patent introduces orthogonal codes and pseudo-noise codes as intermediary elements to modulate the transmission signal. These codes enable precise correlation-based detection in narrow bands while maintaining wide-band operation, acting as a mediator that bridges the gap between wide frequency coverage and precise measurement requirements
2Quantity of substance
If the number of targets to be searched increases, then the radar coverage area increases, but the measurement precision deteriorates due to increased interference between reflected signals from multiple targets
Solution Approach 1:
The patent applies segmentation by dividing the search space into multiple angular sectors and assigning orthogonal codes to different sectors. This allows simultaneous processing of multiple targets in different sectors without mutual interference, maintaining measurement precision even when searching for multiple targets
Solution Approach 2:
The patent implements local quality by applying different orthogonal codes to different spatial regions or target groups. Each code is optimized for its specific region, allowing the radar to maintain high measurement precision for each local area while collectively handling multiple targets across the entire search area
3Reliability
If transmission power is increased to improve target detection capability, then the detection range increases, but the device complexity increases due to the need for delay or gain control of transmission signal
Solution Approach 1:
The patent uses orthogonal codes and pseudo-noise codes as intermediaries to achieve signal processing gain without increasing transmission power. These codes enable the system to process weak reflected signals through correlation operations, maintaining detection capability while avoiding the complexity of power control mechanisms
Solution Approach 2:
The patent replaces mechanical power control systems with signal processing-based detection enhancement. Instead of using delay or gain control mechanisms to improve detection, the system uses code modulation and correlation processing to achieve the same effect with simpler hardware
4Measurement precision
If a narrow-band transmission signal is used, then the measurement precision of target location and speed improves by reducing thermal noise and jamming signal influence, but the device complexity increases due to the need for orthogonal code and pseudo-noise code processing
Solution Approach 1:
The patent merges the functions of orthogonal code generation, pseudo-noise code generation, modulation, and correlation processing into an integrated signal processing framework. This consolidation reduces the overall device complexity while maintaining the measurement precision benefits of narrow-band processing
Solution Approach 2:
The patent designs a universal code processing architecture that handles both orthogonal codes and pseudo-noise codes through the same hardware components. This multi-functional approach reduces device complexity by avoiding separate dedicated circuits for different code types
Data Source
AI summary
Provided is a narrow-band radar device including an orthogonal code generator configured to generate a plurality of orthogonal generators, a pseudo-noise code generator configured to generate a plurality of pseudo-noise codes, a radar transmitter configured to spread-modulate transmission data using the plurality of orthogonal codes and pseudo-noise codes, and a radar receiver configured to demodulate a reception signal using the plurality of orthogonal codes and pseudo-noise codes, and calculate at least one of an azimuth angle, elevation angel, speed, or range of a target from the demodulated reception signal.