Pulse Train Sequencing for Doppler-Resilient Target Detection
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Solution Overview
Problem
Golay complementary sequence pairs are not resilient to Doppler frequency shifts with linear phase variations, leading to degraded performance in target detection tasks such as speed measurement and ranging.
Innovation Solution
A pulse train transmission method using Golay complementary sequences with symbol reversal and extension by Prouhet-Thue-Morse (PTM) sequences, arranged in specific orders to create a sequence group that is resilient to Doppler frequency shifts with linear phase variations, enhancing target detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Golay complementary sequence pair is extended by Prouhet-Thue-Morse (PTM) sequence, then resilience to Doppler frequency shift with stepwise phase variations is improved, but resilience to Doppler frequency shift with linear phase variations deteriorates
Solution Approach 1:
The patent segments the sequence group into multiple subgroups, where each subgroup contains sequences with different symbol arrangement orders (original order and reverse order). This segmentation allows the system to handle different Doppler frequency shift types by selecting appropriate subgroups, thereby resolving the contradiction between resilience to stepwise phase variations and adaptability to linear phase variations.
Solution Approach 2:
The patent introduces asymmetry by arranging symbols in opposite orders in different sequences within the sequence group. Specifically, some sequences maintain original symbol order while others use reverse symbol order. This asymmetric arrangement creates complementary properties that enable the system to be resilient to both stepwise and linear phase variations caused by Doppler frequency shifts.
2Measurement precision
If symbols in sequences are arranged in opposite orders, then target detection performance is improved, but sequence group complexity increases
Solution Approach 1:
The patent creates a universal sequence group structure that serves multiple functions: it provides target detection capability through symbol reversal, maintains Golay complementary properties for low sidelobes, and enables adaptability to different Doppler frequency shift types. By designing the sequence group with N sequences (where N is a power of 2 greater than 2) with systematic opposite order arrangements, the system achieves multi-functionality without excessive complexity.
Data Source
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AI summary
A pulse signal transmission method is provided. The method includes: A communication apparatus determines a first sequence group, where the first sequence group includes N sequences, where N is greater than 2 and is a power of 2, the N sequences include at least one Golay complementary sequence pair, each of the N sequences includes a plurality of symbols, and symbols in at least two sequences are arranged in opposite orders. The communication apparatus sends a pulse train, where the pulse train is obtained based on the first sequence group, and one pulse in the pulse train corresponds to one of the N sequences. This can achieve resilience to a Doppler frequency shift with linear phase variations, and can improve performance of target detection.