Transceiver Circuit Correction for Short-Range Radar Detection
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Solution Overview
Problem
Radar systems face challenges in accurately detecting short-range targets due to unwanted signal bleedthrough and internal reflections, which cause deleterious effects in filters and result in loss of low-frequency data, limiting the minimum operational range and being inefficient in memory usage.
Innovation Solution
A transceiver circuit with a correction circuit that generates a simulated waveform to remove the effects of unwanted signal bleedthrough from filters, allowing for better retention of low-frequency information and improved performance for short-range target detection, using a combination of signal generation, mixing, and filtering with a processor-based correction mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional filtering is used to remove unwanted signal portions, then filter performance is maintained, but low-frequency data is lost and minimum operational range is limited
Solution Approach 1:
The correction signal generation is divided into multiple stages: identifying the unwanted signal portion, generating a correction signal specific to that portion, and applying the correction selectively. This segmentation allows different parts of the signal to be processed differently, preserving low-frequency data while maintaining filter performance for the unwanted portions.
Solution Approach 2:
The system dynamically adjusts correction parameters based on the characteristics of the unwanted signal portion. By changing correction parameters adaptively, the system can remove transient effects without applying fixed filtering that would eliminate low-frequency information, thus resolving the contradiction between filter performance and information retention.
2Measurement precision
If correction signals are generated for all possible signal forms, then detection accuracy is improved, but memory usage increases significantly
Solution Approach 1:
Instead of storing pre-calculated correction signals for all possible signal forms, the system creates correction signals on-demand by copying and adapting the correction process to match the actual unwanted signal characteristics. This approach maintains detection accuracy while avoiding the memory burden of storing numerous pre-computed correction datasets.
Solution Approach 2:
The system generates its own correction signals dynamically based on the observed unwanted signal portions, rather than relying on pre-stored correction data. This self-service approach allows the system to adapt to arbitrary signal forms without requiring extensive memory resources for pre-computed corrections.
3Productivity
If pre-calculated corrections are used, then processing speed is improved, but flexibility for arbitrary signal forms is reduced
Solution Approach 1:
The correction system transitions from static pre-calculated corrections to dynamic on-demand generation. The correction signals are generated adaptively based on the actual unwanted signal characteristics, allowing the system to maintain processing efficiency while achieving flexibility for arbitrary signal forms through dynamic parameter adjustment.
Solution Approach 2:
The system performs preliminary identification of unwanted signal characteristics and generates appropriate correction signals before the main detection processing. This preliminary action maintains processing speed by preparing corrections in advance, while the adaptive nature of the correction generation ensures flexibility for arbitrary signal forms.
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 solution enhances radar system performance by effectively removing transient effects from filters, maintaining more low-frequency data and reducing memory usage, enabling better detection of short-range targets with flexibility for arbitrary signal forms without pre-calculating corrections.
Implementation Method 1
a mixer coupled to the receiver and to the signal generator so as to mix the output signal and the received signal so as to produce a mixed signal
Implementation Method 2
at least one filter coupled to the mixer so as to act upon the mixed signal to produce a filtered signal
Data Source
AI summary
A transceiver circuit includes a signal generator arranged to generate an output signal; a transmitter coupled to the signal generator so as to transmit the output signal; a receiver arranged to receive a received signal; a mixer coupled to the receiver and to the signal generator so as to mix the output signal and the received signal so as to produce a mixed signal; and at least one filter coupled to the mixer so as to act upon the mixed signal to produce a filtered signal. The filtered signal includes an unwanted portion of the output signal is received at the receiver without having been reflected from a target. The transceiver circuit further includes a correction circuit arranged to generate a simulated waveform that simulates the behavior of the each filter to the unwanted portion of the output signal and applies a correction so as to remove the simulated waveform from the filtered signal.