A Real-Time Optimization Method for Digital Guidance Sources of Shipborne Measurement and Control Radar

Abstract

This invention relates to a real-time optimization method for digital guidance sources of shipborne telemetry and control radar. The method comprises components such as a network data receiving program and a digital guidance processing program. The system also requires an external time synchronization system to provide time interrupt signals. These components can be deployed on the same telemetry and control unit server or workstation. The network data receiving program is an interface-layer telemetry and control data processing program used to receive network data from multiple guidance sources and the swaying data of the moving platform. The digital guidance processing program is driven by the interrupt signal from the external time synchronization system, acquiring data from multiple guidance sources from the network data receiving program at fixed intervals and performing online quality assessment and real-time optimization. It then uses the optimized guidance sources to calculate the digital guidance information of the shipborne telemetry and control radar and transmits it externally. This invention, based on a time-division priority guidance source strategy, performs real-time optimization of guidance sources through online quality assessment of digital guidance sources, ensuring the timeliness, accuracy, and stability of the digital guidance information of the shipborne telemetry and control radar.

Description

Technical Field

[0001] This invention belongs to the field of aerospace telemetry and control data processing, and relates to the real-time processing of digital guidance sources of telemetry and control radar on tracking ships. It can be used for the real-time selection of multiple guidance sources in different arc segments of aerospace launch maritime telemetry and control missions. Background Technology

[0002] During maritime tracking and control of space launches, shipborne tracking radar requires timely and accurate digital guidance information from the measurement ship's central computer to stably acquire and track the spacecraft. In different missions, influenced by factors such as the designed trajectory, tracking and control station deployment, measurement system, and payload type, the source data used to calculate digital guidance information exhibits variable quantity and inconsistent quality. To address this, the traditional method involves displaying and comparing different digital guidance sources using curves, with manual selection by personnel. This method relies on the subjective experience and judgment of the personnel, resulting in poor timeliness and low-quality results in the selection of digital guidance sources. In severe cases, large jumps between manually selected guidance sources can cause radar antenna overshoot, compromising safety.

[0003] To improve the efficiency of real-time selection of digital bootstrap sources, we constructed an online quality assessment and real-time optimization method for bootstrap sources based on time-division priority. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a real-time optimization method for digital guidance sources of shipborne telemetry and control radar. This method is designed for situations in which multiple shipborne telemetry and control radars face multiple guidance sources in different arc segments during the maritime telemetry and control process of space launch. It constructs a time-priority guidance source strategy and optimizes the guidance source in real time through online quality assessment of digital guidance sources, thereby ensuring the timeliness, accuracy and stability of digital guidance information of shipborne telemetry and control radar.

[0005] The technical solution adopted by this invention to solve the above problems is: a real-time optimization method for a digital guidance source of a shipborne telemetry and control radar, which adopts a time-driven approach and includes the following steps:

[0006] Step A: Accumulate all digital guidance sources within the corresponding task arc interval according to the current time parameter.

[0007] Step B: Traverse the accumulated digital guidance sources according to their priority list in the strategy. Obtain the frame sequence of one guidance source and determine if the frame sequence is reasonable. If reasonable, add it to the candidate guidance sources and continue traversing; otherwise, discard the guidance source and continue traversing.

[0008] Step C: Determine the number of candidate boot sources. If the number is 0, exit; if the number is 1 or 2, select the boot source with higher priority and proceed to step G; if the number is greater than 2, proceed to step D.

[0009] Step D: Time-align the candidate boot sources and form a boot source sequence with equal time intervals and the same number of boot sources through multi-point Langron interpolation.

[0010] Step E: Calculate the cross-correlation coefficient by combining the guide source sequences pairwise.

[0011] Step F: Traverse the sequence of guiding sources according to priority and determine whether the cross-correlation coefficient with other guiding sources meets the set threshold. If the correlation coefficient is greater than the set threshold, select the guiding source and proceed to step G; if the condition cannot be met after the traversal, select the guiding source with the highest priority and proceed to step G.

[0012] Step G: Calculate the digital guidance information of the shipborne telemetry and control radar using the selected guidance source, and check it against the information sent in the previous frame. If the angle change between the two frames is greater than a set threshold, update the guidance information according to the threshold limit.

[0013] Step H: Send the guidance message and save the sending result, then exit.

[0014] In step B, the rationality judgment method consists of two steps: First, a time judgment is made according to the strategy. If the last frame of the guidance source frame sequence expires beyond the set parameter, it is considered unreasonable, and the process continues to traverse the next guidance source. Second, the trajectory of the last guidance source is extrapolated using Langran interpolation, and the last frame of guidance source network data and extrapolated data are converted to the geodetic system of the station based on the station site information corresponding to the mission arc segment. A rationality judgment is made based on the differences in measurement elements such as azimuth, elevation, and slant range. If the difference of any measurement element exceeds three times the random error of that measurement element, it is considered unreasonable, and the process continues to traverse the next guidance source; otherwise, the data is considered reasonable.

[0015] In step D, the maximum value T of the time of all information in the candidate boot source is taken. max Construct equal time intervals [T] max -2.0:0.05:T max ], iterate through the candidate boot sources according to priority, select at least 3 points and the first point's time is less than T. max The array of -2.0 is subjected to multi-point Langron interpolation to form a 41-point guiding source sequence.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] This invention performs online quality assessment and real-time optimization of digital guidance sources for shipborne telemetry and control radar, effectively suppressing guidance source jumps, improving guidance source switching efficiency, and ensuring the timeliness, accuracy, and stability of digital guidance information from shipborne telemetry and control radar. Attached Figure Description

[0018] Figure 1 This is a flowchart illustrating the real-time optimization process of the digital guidance source for shipborne telemetry and control radar as described in this invention. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] This application provides an optimal processing system for digital guidance sources of shipborne telemetry and control radar during maritime telemetry and control for space launches. The system comprises components such as a network data receiving program and a digital guidance processing program. Its operation also requires an external time synchronization system to provide time interrupt signals. These components can be deployed on the same telemetry and control unit server or workstation. The network data receiving program is an interface-layer telemetry and control data processing program used to receive network data from multiple guidance sources and the swaying data of the moving platform. The digital guidance processing program is driven by an interrupt signal from the external time synchronization system. It acquires data from multiple guidance sources from the network data receiving program at fixed intervals, performs online quality assessment and real-time optimization, calculates the digital guidance information of the shipborne telemetry and control radar using the optimized guidance sources, and transmits it externally.

[0021] The preferred method provided by this invention requires defining a time-division priority list of guidance sources. Assuming a space launch mission is divided into four mission segments based on the designed trajectory, telemetry and control station deployment, measurement system, and payload type: land-based radar tracking segment, land-based passive tracking segment, relay tracking segment, and tracking ship tracking segment, the available guidance sources include theoretical trajectory S1, external trajectory S2, telemetry trajectory S3, GPS trajectory S4, ship-based radar accumulation S5, and ship-based telemetry accumulation S6. Based on the characteristics of the four segments, a time-division priority list as shown in Table 1 can be constructed:

[0022] Table 1. Priority List of Time-Sharing Data Sources

[0023]

[0024] In addition to the above embodiments, the present invention also includes other embodiments. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.

Claims

1. A real-time optimization method for a digital guidance source of a shipborne telemetry and control radar, characterized in that... The method includes the following steps: Step A: Accumulate all digital guidance sources within the corresponding task arc interval according to the current time parameters; Step B: According to the priority list in the strategy, the accumulated digital guidance sources are traversed according to priority to obtain the frame sequence of one guidance source. The reasonableness of the guidance source frame sequence is determined. If reasonable, it is added to the candidate guidance source and the traversal continues; otherwise, the guidance source is discarded and the traversal continues. The reasonableness judgment method consists of two steps: First, a time judgment is made according to the strategy. If the last frame of the guidance source frame sequence expires beyond the set parameter, it is considered unreasonable, and the traversal continues to the next guidance source. Second, the trajectory of the last guidance source frame is extrapolated using Lagrange interpolation. Based on the station location information corresponding to the mission arc segment, the last frame of guidance source network data and extrapolated data are converted to the station geosystem. A reasonableness judgment is made based on the difference in measurement elements. If the difference of any measurement element exceeds three times the random error of that measurement element, it is considered unreasonable, and the traversal continues to the next guidance source; otherwise, the data is considered reasonable. Step C: Determine the number of candidate boot sources. If the number is 0, exit; if the number is 1 or 2, select the boot source with higher priority and proceed to step G; if the number is greater than 2, proceed to step D. Step D: Time-align the candidate boot sources and form a boot source sequence with equal time intervals and the same number of boot sources by multi-point Langron interpolation; Step E: Calculate the cross-correlation coefficient by combining the pilot source sequences pairwise; Step F: Traverse the sequence of guiding sources according to priority, and determine whether the cross-correlation coefficient with other guiding sources meets the set threshold. If the correlation coefficient is greater than the set threshold, select the guiding source and go to step G; if the condition still cannot be met after the traversal, select the guiding source with the highest priority and go to step G. Step G: Calculate the digital guidance information of the shipborne telemetry and control radar using the selected guidance source, and check it with the information sent in the previous frame. If the angle change between the two frames is greater than the set threshold, update the guidance information according to the threshold limit. Step H: Send the guidance message and save the sending result, then exit.

2. The real-time optimization method for a digital guidance source of a shipborne telemetry and control radar according to claim 1, characterized in that... In step D, the maximum value T of the time of all information in the candidate guidance source is taken. max Construct equal time intervals [T] max -2.0:0.05:T max ], iterate through the candidate boot sources according to priority, select at least 3 points and the first point's time is less than T. max The array of -2.0 is subjected to multi-point Langron interpolation to form a 41-point guiding source sequence.

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