CN-122000841-A - Strong electromagnetic pulse protection system of photoelectric pod

CN122000841ACN 122000841 ACN122000841 ACN 122000841ACN-122000841-A

Abstract

The invention provides a strong electromagnetic pulse protection system of an optoelectronic pod, which comprises a port combined protection filter and a shafting combined protection filter, wherein the port combined protection filter is used for filtering strong electromagnetic pulse interference coupled from an external connector port, the port combined protection filter comprises a first combined protection filter and a second combined protection filter, the shafting combined protection filter comprises a third combined protection filter and a fourth combined protection filter, the third combined protection filter comprises a power supply protection circuit, a differential signal protection circuit, an excitation signal protection circuit, a rotary change signal protection circuit and a motor signal protection circuit, and the first, second and fourth combined protection filters comprise the power supply protection circuit and the differential signal protection circuit. The invention realizes comprehensive and effective protection of strong electromagnetic pulse interference through targeted structural layout and circuit design, and ensures stable and reliable operation of the photoelectric pod in a complex strong electromagnetic environment.

Inventors

LI XIAOYANG
LI HONGGUANG
ZHAO XIAOLE
WANG XIAOCHEN
LIU YUTING

Assignees

凯迈（洛阳）测控有限公司

Dates

Publication Date: 20260508
Application Date: 20251226

Claims (9)

1. The photoelectric pod strong electromagnetic pulse protection system is arranged on the photoelectric pod and comprises an azimuth assembly and a pitching assembly, an azimuth shafting is arranged in the azimuth assembly, a pitching shafting is arranged in the pitching assembly, and the protection system comprises a port combined protection filter and a shafting combined protection filter; The port combined protection filter is used for filtering strong electromagnetic pulse interference coupled in from the port of the external connector, and comprises a first combined protection filter and a second combined protection filter, wherein the first combined protection filter and the second combined protection filter comprise a power supply protection circuit and a differential signal protection circuit; The shafting combined protection filter comprises a third combined protection filter and a fourth combined protection filter, wherein the third combined protection filter and the fourth combined protection filter are respectively used for filtering strong electromagnetic pulse interference which is coupled from the azimuth shafting and the pitching shafting, the third combined protection filter comprises a power supply protection circuit, a differential signal protection circuit, an excitation signal protection circuit, a rotation signal protection circuit and a motor signal protection circuit, and the fourth combined protection filter comprises a power supply protection circuit and a differential signal protection circuit.
2. The electro-optic pod strong electromagnetic pulse protection system of claim 1, wherein the first and second combined protection filters are each disposed at an external connector port of the azimuth assembly.
3. The electro-optic pod strong electromagnetic pulse protection system of claim 1, wherein a slip ring is provided within the azimuth assembly, the third combined protection filter being disposed adjacent to the slip ring.
4. The electro-optic pod strong electromagnetic pulse protection system of claim 1, wherein the fourth combined protection filter is disposed within the pitch assembly adjacent to the pitch axis.
5. The electro-optic pod strong electromagnetic pulse protection system of claim 1, wherein the power protection circuit is configured to protect a power supply, and comprises bidirectional transient suppression diodes T1, T2, X capacitances Cx1, cx2, Y capacitances Cy1, cy2, cy3, cy4, and a common mode inductance L1; The 1 st pin of the bidirectional transient suppression diode T1 is connected with the input positive end of the power line, and the 2 nd pin is connected with the ground; the 1 st pin of the bidirectional transient suppression diode T2 is connected with the input negative end of the power line, and the 2 nd pin is connected with the ground; the 1 st pin of the common mode inductor L1 is connected with the input positive end of the power line, the 2 nd pin is connected with the input negative end of the power line, the 3 rd pin is connected with the output negative end of the power line, and the 4 th pin is connected with the output positive end of the power line; One end of the X capacitor Cx1 is connected with the positive input end of the power line, and the other end of the X capacitor Cx1 is connected with the negative input end of the power line; One end of the X capacitor Cx2 is connected with the 4 th pin of the common-mode inductor L1, and the other end of the X capacitor Cx2 is connected with the 3 rd pin of the common-mode inductor L1; one end of the Y capacitor Cy1 is connected with a power line input negative terminal, and the other end of the Y capacitor Cy1 is connected with the ground; One end of the Y capacitor Cy2 is connected with the positive input end of the power line, and the other end of the Y capacitor Cy2 is connected with the ground; One end of the Y capacitor Cy3 is connected with the 3 rd pin of the common mode inductor L1, and the other end of the Y capacitor Cy3 is connected with the ground; one end of the Y capacitor Cy4 is connected with the 4 th pin of the common mode inductor L1, and the other end of the Y capacitor Cy4 is connected with the ground.
6. The electro-optic pod strong electromagnetic pulse protection system of claim 1, wherein the differential signal protection circuit is configured to protect differential signals, and comprises bidirectional transient suppression diodes T3, T4, Y capacitors Cy5, cy6, and a common mode inductance L2; the 1 st pin of the bidirectional transient suppression diode T3 is connected with the input positive end of the differential signal line, and the 2 nd pin is connected with the ground; The 1 st pin of the bidirectional transient suppression diode T4 is connected with the input negative end of the differential signal line, and the 2 nd pin is connected with the ground; The 1 st pin of the common mode inductor L2 is connected with the input positive end of the differential signal wire, the 2 nd pin is connected with the input negative end of the differential signal wire, the 3 rd pin is connected with the output negative end of the differential signal wire, and the 4 th pin is connected with the output positive end of the differential signal wire; one end of the Y capacitor Cy5 is connected with the 4 th pin of the common mode inductor L2, and the other end of the Y capacitor Cy5 is connected with the ground; One end of the Y capacitor Cy6 is connected with the 3 rd pin of the common mode inductor L2, and the other end of the Y capacitor Cy6 is connected with the ground.
7. The electro-optic pod strong electromagnetic pulse protection system of claim 1, wherein the excitation signal protection circuit is configured to protect the excitation signal, and comprises bidirectional transient suppression diodes T5, T6, and a common mode inductance L3; the 1 st pin of the bidirectional transient suppression diode T5 is connected with the J end of the excitation signal line, and the 2 nd pin is connected with the ground; the 1 st pin of the bidirectional transient suppression diode T6 is connected with the K end of the excitation signal line, and the 2 nd pin is connected with the ground; The 1 st pin of the common mode inductor L3 is connected with the J end of the excitation signal wire, the 2 nd pin is connected with the K end of the excitation signal wire, the 3 rd pin is connected with the K 'end of the excitation signal wire, and the 4 th pin is connected with the J' end of the excitation signal wire.
8. The optoelectronic pod strong electromagnetic pulse protection system of claim 1, wherein the resolver signal protection circuit is configured to protect a resolver signal, and comprises bidirectional transient suppression diodes T7, T8, T9, T10, T11, T12, T13, T14, T15, Y capacitors Cy7, cy8, cy9, cy10, cy11, cy12, cy13, cy14, cy15, and a common mode inductance L4; The common mode inductance L4 is a nine-wire common mode inductance, the 1 st, 2 nd, 3 rd, 4 th, 5 th, 6 th, 7 th, 8 th and 9 th pins are respectively connected with A, B, C, D, E, F, G, H, I th ends of the rotary-change signal wires, and the 18 th, 17 th, 16 th, 15 th, 14 th, 13 th, 12 th, 11 th and 10 th pins are respectively connected with A ', B ', C ', D ', E ', F ', G ', H ' and I ' ends of the rotary-change signal wires; the 1 st pins of the bidirectional transient suppression diodes T7, T8, T9, T10, T11, T12, T13, T14 and T15 are respectively connected with A, B, C, D, E, F, G, H, I ends of the rotary signal lines, and the 2 nd pins are all connected with the ground; the Y capacitors Cy7, cy8, cy9, cy10, cy11, cy12, cy13, cy14 and Cy15 are three-terminal through capacitors, the first ends of the Y capacitors are respectively connected with the 18 th, 17 th, 16 th, 15 th, 14 th, 13 th, 12 th, 11 th and 10 th pins of the common-mode inductor L4, the second ends of the Y capacitors are respectively connected with the A ', B ', C ', D ', E ', F ', G ', H ', I ' ends of the rotary-transformer signal lines, and the third ends of the Y capacitors are all connected with the ground.
9. The electro-optic pod strong electromagnetic pulse protection system of claim 1, wherein the motor signal protection circuit is configured to protect motor signals, and comprises bidirectional transient suppression diodes T16, T17, and a common mode inductance L5; The 1 st pin of the bidirectional transient suppression diode T16 is connected with the L end of a motor signal line, and the 2 nd pin is connected with the ground; The 1 st pin of the bidirectional transient suppression diode T17 is connected with the M end of the motor signal line, and the 2 nd pin is connected with the ground; The 1 st pin of common mode inductance L4 connects motor signal line L end, and the 2 nd pin connects motor signal line M end, and the 3 rd pin connects motor signal line M 'end, and the 4 th pin connects motor signal line L' end.

Description

Strong electromagnetic pulse protection system of photoelectric pod Technical Field The invention relates to the technical field of strong electromagnetic protection, in particular to a strong electromagnetic pulse protection system of an optoelectronic pod. Background The photoelectric pod is used as core equipment integrating photoelectric detection, signal transmission, servo control and other functions, is widely applied to carriers such as unmanned aerial vehicles, airplanes, ships and the like, and the working environment of the photoelectric pod is often filled with complex and various electromagnetic interference signals, and mainly comprises radio station electromagnetic wave signals, radar electromagnetic wave signals, various communication signals and the like. The traditional interference signals have the characteristics of low field intensity and continuous wave as main characteristics, so the early electromagnetic protection design of the photoelectric pod is mainly developed around modes of filtering, structural shell shielding, cable shielding and the like, the design basis mainly meets the relevant project assessment in the military standard GJB151B of the people's republic of China, namely, electromagnetic emission and sensitivity requirements of military equipment and subsystems, wherein CS114 (power line conduction sensitivity-pulse), CS115 (power line conduction sensitivity-spike signal), CS116 (power line conduction sensitivity-damped oscillation wave), RS103 (radiation sensitivity-electric field) and other projects are core assessment indexes, and the traditional low field intensity continuous wave interference can be effectively resisted through the protection means. Along with the rapid development of modern electronic countermeasure technology, strong radiation sources such as high-power microwave weapons gradually become important components in complex electromagnetic environments, and strong electromagnetic pulses generated by the radiation sources have the remarkable characteristics of high field intensity, concentrated energy, strong instantaneity and the like, and the interference intensity and the destructive power of the strong electromagnetic pulses are far higher than those of the traditional electromagnetic interference. However, the electromagnetic protection design of the existing optoelectronic pod is not specially optimized for the characteristics of strong electromagnetic pulse, so that a plurality of problems are exposed in the irradiation environment of the strong electromagnetic pulse: First, the external connector port lacks strong electromagnetic pulse specific protection. The external connector is a key interface for power supply and signal transmission between the photoelectric pod and external equipment, and is also one of main paths for coupling strong electromagnetic pulse interference into the pod. The existing filtering design can only deal with low-field strength continuous wave interference, the protection capability of the filtering design cannot resist the instantaneous impact of strong electromagnetic pulses, and the strong electromagnetic pulses are easy to be directly coupled to an in-cabin line through the port. Secondly, an electromagnetic protection weak link exists in the azimuth and pitching axes. The shafting is used as a core component for realizing azimuth adjustment and pitching rotation of the photoelectric pod, and a rotating connection part (such as a slip ring) and a structural gap of the shafting are difficult to realize complete electromagnetic shielding, so that the shafting becomes another important path for entering the pod by strong electromagnetic pulse interference. The prior art does not provide a targeted enhanced protection for these weak points, resulting in interference signals that can easily enter the interior through shafting coupling. Furthermore, the protection circuit has insufficient pertinence. The azimuth shafting relates to transmission of special types of signals such as exciting signals, rotary signals and motor signals, and the existing protection circuit does not design corresponding protection modules aiming at the transmission characteristics of the special signals, so that the signal lines become weak links of interference coupling, and the overall protection effect is further reduced. The problems directly lead the existing photoelectric pod to be incapable of working normally in a strong electromagnetic pulse irradiation environment, and are particularly manifested by image interference distortion, out-of-control of a servo system, interruption of a communication link and the like, and even cause breakdown and damage of core devices in the pod when serious, so that the photoelectric pod cannot be assembled together with high-power microwave load, and the application range and the operational efficiency of the photoelectric pod in a modern complex electromagnetic countermeasure scene are greatly limited.