A mixed decoding method for laser seeker
By combining a high-speed main channel and an auxiliary verification channel in a hybrid decoding method, the misjudgment problem of traditional digital matched filters under non-ideal channel conditions is solved, achieving high robustness and high efficiency in signal decoding and adapting to complex channel environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUNAN HUANAN OPTOELECTRONIC GRP CO LTD
- Filing Date
- 2026-03-11
- Publication Date
- 2026-06-09
AI Technical Summary
Traditional digital matched filters are susceptible to leakage pulses and interference pulses under non-ideal channel conditions, leading to misjudgments. They lack the ability to finely verify the integrity of the signal structure and are difficult to maintain high robustness and accuracy in complex channel environments.
A hybrid decoding method combining a high-speed main channel and an auxiliary verification channel is adopted. The high-speed main channel quickly locates potential signal frames through a digital matched filter, while the auxiliary verification channel performs fine verification through incremental autocorrelation analysis. The joint decision unit fuses the two types of information to make a decision.
It significantly improves the robustness and accuracy of signal decoding, effectively suppresses false positives and false negatives, reduces computational complexity, and enhances adaptability.
Smart Images
Figure CN122178999A_ABST
Abstract
Claims
1. A hybrid decoding method for a laser seeker, characterized in that, The core module consists of a high-speed main channel, an auxiliary verification channel, and a joint decision unit. The specific implementation steps of the hybrid decoding method are as follows: S1. The high-speed main channel scans the input signal stream and quickly locates potential candidate signal frames; S2, the auxiliary verification channel verifies the candidate signal frames locked by the high-speed main channel, distinguishing between real signals and noise-like interference; S3, the joint decision-maker integrates information from different dimensions provided by the main and auxiliary channels to make reliable decoding decisions.
2. The laser seeker hybrid decoding method according to claim 1, characterized in that, The high-speed main channel mentioned in step S1 includes a digital matched filter whose impulse response is the conjugate time reversal of the desired signal waveform. The working process of the high-speed main channel is as follows: S1.1 Signal Input and Main Channel Processing: The analog signal continuously received by the receiver is filtered, amplified, and converted from analog to digital at the front end, and then converted into a digital baseband stream, which is input into the high-speed main channel. S1.2, Fast acquisition of the main channel: The digital matched filter is preloaded with the desired code, and the input digital baseband signal stream is subjected to continuous convolution correlation operation to output the correlation peak value P_dm; S1.3 Candidate Frame Triggering Mechanism: The system sets a dynamically adjusted decision threshold unit at the output of the digital matched filter. When the output peak of the digital matched filter exceeds the threshold unit, it indicates that a potential signal frame start point has been detected. The system generates a trigger signal and records the current time information.
3. The laser seeker hybrid decoding method according to claim 2, characterized in that, The triggering mechanism for generating the trigger signal by the digital matched filter includes: (1) Calculate noise power in real time and generate dynamic adaptive threshold; (2) By continuously detecting the amplitude within M samples, the peak value is locked, and a precise trigger signal is generated.
4. The laser seeker hybrid decoding method according to claim 1, characterized in that, The auxiliary verification channel mentioned in step S2 includes an incremental sliding autocorrelation analysis module. The workflow of the auxiliary verification channel is as follows: S2.1, Activation of Local Window in Auxiliary Verification Channel: The trigger signal of the high-speed main channel activates the incremental sliding autocorrelation analysis module of the auxiliary verification channel and simultaneously starts a local time window, the size of which is set to match a complete signal frame period or its key part; S2.2 Fine-grained verification of the auxiliary verification channel: The auxiliary verification channel performs incremental autocorrelation analysis within a local window before and after the triggering time of the digital matched filter, and outputs the autocorrelation analysis peak value P_ac and its corresponding time delay. The auxiliary verification channel uses an incremental recursive algorithm to calculate the autocorrelation function of the signal within the window. The incremental recursive formula is as follows: Where x_in·x_in_minus_k is the kth sample in the current window, i.e., x(k), and the new sample x_in is paired with it; x_out_minus_k is the kth sample from the end of the previous window, i.e., the sample before x_out.
5. The laser seeker hybrid decoding method according to claim 1, characterized in that, The workflow of the joint decision unit described in step S3 is as follows: S3.1 After the auxiliary verification channel analysis is completed, the system takes the output peak value P_dm of the main channel digital matched filter and the autocorrelation peak value P_ac of the auxiliary verification channel as two key features and inputs them into a joint decision unit. S3.
2. The final decision is made using a weighted sum criterion, and the weighted sum formula is as follows: Where w_m and w_a are weighting coefficients, and Th_joint is the joint decision threshold. If both indicators meet the criteria, a valid decoding result is output.