Radar Apparatus Digital Modulation Signal Interference
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Solution Overview
Problem
Analog modulation schemes in radar systems have lower reliability and are not suitable for integrated circuit technologies, leading to signal interference and degradation in performance, especially in high-resolution millimeter/sub-millimeter band radar systems used for industrial and military applications.
Innovation Solution
A radar apparatus using digital modulation and demodulation technology, where digitally modulated signals with unique identification codes are transmitted and received, allowing for accurate distance and velocity measurement through correlation of distance codes and Doppler frequency analysis, with components including digital-analog converters, oscillators, and power amplifiers for signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an analog modulation scheme is used in radar systems, then the system can be implemented with simpler circuitry, but the reliability is lower and integrated circuit technology cannot be effectively utilized
Solution Approach 1:
The patent replaces the analog modulation scheme with a digital modulation scheme. Specifically, it uses binary phase shift keying (BPSK) modulation to modulate the transmitting signal with digital codes (preamble, distance codes, data). This substitution enables the use of integrated circuit technology and digital signal processing, thereby improving system reliability while maintaining ease of implementation through standardized digital components.
2Adaptability or versatility
If multiple radars simultaneously use the same frequency band, then the coverage area is maximized, but mutual interference occurs and receiving performance degrades
Solution Approach 1:
The patent applies local quality by assigning different characteristics to different parts of the signal structure. Specifically, it uses unique identification codes for each radar apparatus and distinct distance codes with specific correlation properties. This allows each radar to be identified and distinguished locally within the same frequency band, reducing mutual interference while maintaining broad frequency band utilization.
Solution Approach 2:
The patent changes signal parameters to reduce interference. It employs digital modulation with specific code sequences (preamble, distance codes) that have controlled autocorrelation and cross-correlation properties. By changing the temporal and spectral characteristics of the transmitted signal through digital coding, the system can distinguish between multiple radars operating in the same band, thereby reducing harmful interference.
3Reliability
If digital modulation and demodulation technology is used, then reliability is improved and integrated circuit implementation is enabled, but device complexity increases
Solution Approach 1:
The patent segments the transmitted signal into distinct components: preamble, distance codes, and data. This segmentation allows for specialized processing of each component - the preamble for synchronization, the distance codes for range measurement with specific correlation properties, and the data for information transmission. This structured segmentation simplifies the overall digital signal processing architecture while maintaining high reliability.
Solution Approach 2:
The patent uses periodic transmission of structured signal packets containing preamble and distance codes. This periodic action with defined temporal structure enables synchronized reception and simplifies the timing and control logic in the receiver, reducing overall system complexity despite the use of digital modulation and demodulation technology.
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
The radar apparatus achieves improved reliability and reduced interference, enabling accurate distance and velocity measurement of targets, and is easily implemented with integrated circuit technology, enhancing performance in multi-target detection and reducing signal interference.
Implementation Method 1
a transmitter that converts a digital modulation signal generated by a digital signal processor into an analog signal and transmits the transmitting signal generated by converting the analog signal into a carrier frequency
Implementation Method 2
The velocity of the target may be calculated based on a change in a Doppler frequency of the echo signals reflected and returned by the target
Implementation Method 3
an echo signal returned due to reflection of the transmitting signal from the target
Data Source
AI summary
An embodiment of the present invention relates to a radar apparatus, wherein a distance to a target and a velocity of the target are measured by transmitting a digitally modulated transmitting signal using a digital code and receiving and demodulating an echo signal returned due to reflection of the transmitting signal from the target.