Radar Signal Processing Circuit Equidistance Noise Correction
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Solution Overview
Problem
Existing radar devices face challenges in accurately calculating distance due to varying signal strength affected by object size and reflectance, leading to increased noise and inaccurate measurements, particularly when uniformly increasing amplification in reception circuits.
Innovation Solution
A radar device with a signal processing circuit that includes a buffer for storing signal strength data and a correction circuit for performing equidistance-based correction processing, which adjusts and cancels noise in signal strength data to improve accuracy in distance calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the degree of amplification made by the reception circuit is uniformly increased with time, then the received-wave signal strength is smoothed, but noise attributable to the size and reflectance of the object is also increased, making it difficult to accurately calculate the distance
Solution Approach 1:
The invention applies different amplification degrees to different time periods. Specifically, a first amplification degree is applied during a first time period when the transmitted wave is likely to collide with the object, and a second amplification degree (different from the first) is applied during a second time period. This local differentiation in amplification strategy allows the system to enhance weak signals from distant objects while avoiding excessive amplification of noise from nearby objects with high reflectance.
Solution Approach 2:
The invention performs preliminary classification of time periods based on the likelihood of wave-object collision. By determining in advance which time periods correspond to high collision probability and which correspond to low collision probability, the system can pre-assign appropriate amplification degrees before receiving signals, thereby optimizing noise suppression and signal enhancement strategies proactively rather than reactively.
2Adaptability or versatility
If the degree of amplification made by the reception circuit is uniformly increased with time, then the received-wave signal strength is smoothed, but the method is applicable only to pulse radar devices
Solution Approach 1:
The invention determines amplification degrees based on the type of transmitted wave (pulse wave or continuous wave) and the corresponding collision probability with objects. The control circuit is configured to selectively apply different amplification strategies depending on the radar mode, making the system universally applicable to both pulse radar and continuous wave radar devices while maintaining optimal performance for each type.
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
Enables highly accurate distance calculation by suppressing noise and improving ranging accuracy through equidistance-based correction processing, allowing for precise determination of object distances despite varying signal strengths.
Implementation Method 1
a radar device which detects a distance from an object based on radio waves reflected from the object
Data Source
AI summary
A radar device is provided which is capable of highly accurate distance calculation by a simple method. The radar device includes: a transmission circuit which transmits radio waves; an adjustment circuit which adjusts transmission angles of the radio waves transmitted from the transmission circuit; a reception circuit which receives plural signals which are the radio waves transmitted, based on adjustment made by the adjustment circuit, from the transmission circuit and respectively reflected from an object; and a signal processing circuit which, by processing the received signals, calculates a distance to the object. The signal processing circuit includes a buffer which stores signal strength data on the signals received by the reception circuit, the received signals respectively corresponding to the transmission angles, and a correction circuit which performs correction processing on equidistance-based portions of the signal strength data on the received signals stored in the buffer.