Phase-Compensated Radar Detection for Moving Targets
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Solution Overview
Problem
Conventional detection devices face challenges in accurately detecting moving targets due to Doppler shift-induced phase rotation, which complicates the correlation of received encoded pulse signals with reference signals, leading to incorrect target detection.
Innovation Solution
The detection system incorporates a receiver with a first correlation unit (I) and a first correlation unit (Q), along with n sets of phase control units, strength acquisition units, and a unification unit, which perform phase rotation operations on correlation signals to compensate for Doppler shifts, improving the accuracy of detecting moving targets and their relative speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional correlation detection is used without phase compensation, then the detection device can simply correlate received signals with reference signals, but it cannot accurately detect moving targets due to Doppler shift-induced phase rotation
Solution Approach 1:
The detection device segments the correlation detection process into multiple parallel channels, each handling a specific phase rotation amount. The correlation detection unit performs correlation detection for multiple phase rotation amounts simultaneously, dividing the complex detection task into manageable segments that can be processed in parallel.
Solution Approach 2:
The system dynamically adapts to different Doppler shift conditions by implementing correlation detection for multiple phase rotation amounts. Instead of using a fixed correlation approach, the system dynamically selects and processes multiple phase rotations to accommodate varying target speeds and directions, making the detection process adaptable to changing conditions.
2Reliability
If the detection device performs correlation without considering phase rotation, then the processing is simpler and faster, but the detection accuracy for moving targets deteriorates
Solution Approach 1:
The correlation detection is segmented into multiple parallel detection paths, each corresponding to a different phase rotation amount. This segmentation allows the system to maintain high reliability by ensuring that at least one detection path will correctly compensate for the actual Doppler shift, while keeping each individual detection path relatively simple.
Solution Approach 2:
The system uses feedback from the detection results to determine target presence and speed. By performing correlation detection for multiple phase rotation amounts and analyzing the results, the system can reliably detect moving targets and determine their characteristics through feedback from the correlation outputs.
3Measurement precision
If multiple phase rotation amounts are tested in parallel, then moving target detection accuracy improves, but the computational load and processing complexity increase
Solution Approach 1:
The signal processing is segmented into parallel correlation detection channels, each handling a specific phase rotation amount. This segmentation enables simultaneous processing of multiple hypotheses without sequential overhead, improving productivity while maintaining precision through parallel execution of simplified detection tasks.
Solution Approach 2:
The system performs preliminary correlation detection for multiple phase rotation amounts before final target confirmation. By pre-computing correlation results for various phase rotations and storing them, the system prepares detection data in advance, reducing the computational burden during final target identification and speed determination.
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
This approach enhances the detection accuracy of moving targets and static targets by generating correlation peaks greater than or equal to a threshold, enabling precise target presence and speed determination, thereby improving the overall detection system's performance.
Implementation Method 1
a radar transmitter 3e that transmits an electromagnetic wave signal
Implementation Method 2
when the target Is moving relative to the detection device, the Doppler shift may cause a phase rotation in the received encoded pulse signal
Data Source
Figure 1
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Figure 4
AI summary
A detection device includes: a first correlation circuit that computes correlation of a first wave detection signal, which is a phase-modulated input wave detected at determined frequency, with a determined code sequence for every code composing the determined code sequence, and to generate first correlation signals the number of which corresponds to a code sequence length, which is a length of the determined code sequence; and a control circuit that rotates phases of the first correlation signals, generates an added value by adding the phase-rotated first correlation signals, and determines based on the added value whether the phase-modulated input wave is a return wave from a determined object.