Pulse Compression Radar Pre-Distortion With Shared Feedback Circuit
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Solution Overview
Problem
Pulse compression radars with pre-distortion require complex circuit structures due to separate transmission and reception-side circuits, leading to increased costs and component count, as existing solutions either focus solely on transmission or use different methods that do not address signal correction effectively.
Innovation Solution
A pulse compression radar configuration that includes an ideal transmission signal memory, a transmission signal amplifying module, an antenna, a reception circuit, a signal feedback circuit, and a transmission signal correcting module, where the signal feedback circuit allows sharing of components between the reception and correction circuits, simplifying the circuit structure and reducing costs by utilizing a circulator and mixer for both feedback and reception signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pre-distortion circuit is provided in addition to transmission-side and reception-side circuits, then transmission signal distortion can be corrected, but the circuit structure becomes complicated
Solution Approach 1:
The patent combines the pre-distortion correction circuit with the reception-side circuit into a single integrated circuit. The correction circuit includes a reception signal input unit, correction amount calculation unit, and transmission signal correction unit that share hardware resources with the reception function, thereby reducing overall circuit complexity while maintaining distortion correction capability
Solution Approach 2:
The integrated circuit performs multiple functions: it receives transmission signals, extracts echo signals, calculates correction amounts based on the echo signals, and applies pre-distortion correction to subsequent transmission signals. This multi-functional design eliminates the need for separate dedicated pre-distortion hardware
2Reliability
If separate transmission and reception circuits are used with pre-distortion, then signal correction can be performed, but component count and costs increase
Solution Approach 1:
The patent merges multiple functional units into a single integrated circuit chip, reducing the total component count. The correction circuit units (reception signal input, correction amount calculation, transmission signal correction) are integrated with the reception circuitry, eliminating the need for separate discrete components for each function
3Device complexity
If the reception circuit processes both reception and feedback signals, then circuit structure is simplified, but signal level and noise figure may be affected
Solution Approach 1:
The patent segments the signal processing within the integrated circuit by providing separate input paths: a first reception signal input for receiving echo signals and a second reception signal input for receiving feedback signals. This segmentation allows the circuit to process different signal types independently while sharing the same correction circuitry, maintaining signal integrity and noise performance
Solution Approach 2:
The patent applies different processing characteristics to different signal inputs within the same circuit. The correction amount calculation unit separately processes echo signals and feedback signals with appropriate gain and filtering characteristics optimized for each signal type, ensuring that local signal quality requirements are met while using shared hardware resources
Data Source
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Figure 3(A)~3(B)
AI summary
A pulse compression radar for performing pre-distortion is provided, which has a configuration simplified in circuit structure. A radar apparatus (pulse compression radar) 1 includes an antenna 10 configured to externally transmit a transmission signal transmitted by a power amplifier 16 and receive a reflection signal caused thereby as a reception signal. The radar apparatus 1 includes a reception circuit 41 configured to propagate this reception signal to a radar image creating module 26. The radar apparatus 1 corrects beforehand, by utilizing the transmission signal (feedback signal) transmitted from the power amplifier 16, a transmission signal to be inputted into the power amplifier 16 so as to cancel distortion of the transmission signal caused by amplification effect of the power amplifier 16. Further, a circuit where the reception signal passes and a circuit where the feedback signal passes share a part of each other.