Method for transmitting high-speed signal in rotating device

Abstract

The invention relates to a device for transmitting a high-speed signal in a rotating device. The device comprises a detector sending interface circuit, a rigid-flexible board and a receiving interface circuit, a plurality of detector sending interface circuits are connected with the input end of a rigid-flexible board through a superfine coaxial line, the output end of the rigid-flexible board is connected with a receiving interface circuit through a superfine coaxial line, the rotating device comprises a fixed shaft and a rotating shaft installed in the fixed shaft, one end of the rigid-flexible board is fixed on the outer wall of the rotating shaft and wound on the rotating shaft, and the other end of the rigid-flexible board is connected with the receiving interface circuit. And the other end is fixedly connected with the inner wall of the fixed shaft. According to the invention, an interface chip is adopted, and a rigid-flexible board and a superfine coaxial line are used as transmission media, so that the transmission of a high-speed image signal in a hollow shafting is realized. And the image signal is transmitted by adopting the ultra-thin coaxial line, so that the integrity of signal transmission is ensured, and the size of the cable is reduced. A rigid-flexible board is adopted, impedance continuity of a high-speed signal transmission link is guaranteed through impedance control, and high-speed signal transmission can be achieved while a shaft system moves within a certain angle range.

Description

Technical Field

[0001] The present invention belongs to the field of optoelectronic aiming technology, and specifically relates to a method for transmitting high-speed signals in a rotating device, and more particularly to a method for transmitting high-speed image signals in the field of optoelectronic pods. Background Art

[0002] The new multifunctional optoelectronic targeting pod can detect, identify, automatically track and laser lock targets at long distances, provide high-resolution image information and enhance situational awareness. As the eyes of the aircraft, the imaging quality of the optoelectronic pod determines the visual ability of the aircraft. The pod integrates medium-wave infrared, short-wave infrared, black-and-white television and color television imaging detectors.

[0003] The optoelectronic pod servo platform adopts a three-axis three-frame motor direct drive + fast reflector (FSM) two-level stabilization and anti-scanning working system, combined with servo control algorithm and motor drive, to achieve inertial space stabilization of the visual axis in azimuth and pitch, as well as search and tracking of targets within a small angle range. The optoelectronic pod imaging detector is located on the azimuth frame of the stable platform, and the image signal needs to be transmitted from the azimuth frame, through the pitch frame, and finally to the information processing board on the roll frame for pre-processing.

[0004] The high-speed image transmission interface commonly used in optoelectronic pods mainly adopts the cameralink interface. The cameralink interface has 15 signal lines. In the case of multiple imaging detectors, it will cause too many image signals to pass through the azimuth and pitch axis systems.

[0005] Currently, there are two common methods to achieve image signal transmission from the moving end to the fixed end of a stable platform. The first is to design a central through hole in the rotating axis system connecting the inner and outer frames, and the signal line directly passes through the center hole to achieve signal transmission. However, when there are too many signal lines, a large interference torque will be generated on the axis system. The second method is to add a slip ring in the rotating axis system. The slip ring can achieve signal transmission when the inner and outer frames move relative to each other.

[0006] As optoelectronic pods develop towards small size, long focal length, large aperture, and multi-spectrum, the optical system design is deeply coupled with the structure of the stabilized platform. The axis system of the optoelectronic stabilized platform also needs to transmit the optical path and cannot be blocked. This causes the space for the center of the axis system to be occupied by the optical path, making it impossible to transmit signals by threading the axis center.

[0007] If slip rings are added to the shaft system of the optoelectronic stabilization platform, the slip rings need to be designed as a hollow structure. Currently, slip rings are mainly used to transmit high-speed signals through optical fibers and coaxial cables. Both methods require the use of slip ring centers, so it is not feasible to use slip rings to achieve high-speed signal transmission in shaft systems. Summary of the invention

[0008] The present invention provides a method for transmitting high-speed signals in a rotating device, adopting a TLK2711 interface chip, using a rigid-flex board and an extremely fine coaxial line as transmission media, to achieve transmission of high-speed image signals in a hollow shaft system.

[0009] In order to solve the above technical problems, the present invention provides a device for transmitting high-speed signals in a rotating device, which is characterized in that: it includes a detector transmitting interface circuit, a rigid-flexible board 10, and a receiving interface circuit; multiple detector transmitting interface circuits are connected to the input end of the rigid-flexible board 10 through an extremely fine coaxial line, and the output end of the rigid-flexible board 10 is connected to the receiving interface circuit through an extremely fine coaxial line. The rotating device includes a fixed axis and a rotating shaft installed in the fixed axis, one end of the rigid-flexible board 10 is fixed on the outer wall of the rotating shaft and wound on the rotating shaft, and the other end is fixedly connected to the inner wall of the fixed axis.

[0010] Beneficial effects: The present invention adopts the TLK2711 interface chip, uses a rigid-flexible board and an extremely thin coaxial line as a transmission medium, and realizes the transmission of high-speed image signals in a hollow shaft system.

[0011] 1. The present invention adopts an extremely thin coaxial line RF0.81 to transmit image signals, which not only ensures the integrity of signal transmission but also reduces the cable volume.

[0012] 2. The present invention adopts a rigid-flexible board, and ensures the impedance continuity of the high-speed signal transmission link through impedance control. Winding the rigid-flexible board around the hollow shaft system can achieve high-speed signal transmission while the shaft system moves within a certain angle range.

[0013] 3. The system structure of the present invention is simple and flexible, and the number of high-speed signal transmission links can be designed according to one's own needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a principle block diagram of the present invention;

[0015] Figure 2 It is a structural diagram of a rigid-flexible board of the present invention;

[0016] Figure 3 is an axonometric view of the present invention;

[0017] Among them, 1-the first detector sending interface circuit, 2-the second detector sending interface circuit, 3-the third detector sending interface circuit, 4-the first extremely fine coaxial line, 5-the second extremely fine coaxial line, 6-the third extremely fine coaxial line, 7-the fourth extremely fine coaxial line, 8-the fifth extremely fine coaxial line, 9-the sixth extremely fine coaxial line, 10-rigid-flexible board, 11-the seventh extremely fine coaxial line, 12-the eighth extremely fine coaxial line, 13-the ninth extremely fine coaxial line, 14-the tenth extremely fine coaxial line, 15-the eleventh extremely fine coaxial line, 16-the twelfth extremely fine coaxial line, 17-receiving interface circuit, 18-rotating shaft, 19-fixed shaft, 20-rigid-flexible board. DETAILED DESCRIPTION

[0018] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below.

[0019] The present invention proposes a device for transmitting high-speed signals in a rotating device, comprising a first detector transmitting interface circuit 1, a second detector transmitting interface circuit 2, a third detector transmitting interface circuit 3, a first extremely fine coaxial line 4, a second extremely fine coaxial line 5, a third extremely fine coaxial line 6, a fourth extremely fine coaxial line 7, a fifth extremely fine coaxial line 8, a sixth extremely fine coaxial line 9, a rigid-flexible board 10, a seventh extremely fine coaxial line 11, an eighth extremely fine coaxial line 12, a ninth extremely fine coaxial line 13, a tenth extremely fine coaxial line 14, an eleventh extremely fine coaxial line 15, a twelfth extremely fine coaxial line 16, and a receiving interface circuit 17;

[0020] The rotating shaft is installed in the fixed shaft and is rotatably connected. One end of the rigid-flexible plate is fixed on the outer wall of the rotating shaft and wrapped around the rotating shaft, and the other end is fixedly connected to the inner wall of the fixed shaft. The rotation angle of the rotating shaft is less than 360 degrees.

[0021] The characteristic impedance of the ultra-fine coaxial line is 50 ohms.

[0022] The first detector sends an interface circuit image signal to the first and second extremely fine coaxial lines; the second detector sends an interface circuit image signal to the third and fourth extremely fine coaxial lines; the third detector sends an interface circuit image signal to the fifth and sixth extremely fine coaxial lines;

[0023] The first detector transmitting interface circuit 1, the second detector transmitting interface circuit 2, and the third detector transmitting interface circuit 3 are all composed of an FPGA chip, a TLK2711 transceiver chip, and a crystal oscillator; the crystal oscillator is connected to the FPGA clock input pin and the TLK2711 chip TXCLK pin at the same time.

[0024] The FPGA chip is used to collect image signals, and sends the processed image signals to the TLK2711 transceiver chip through the parallel port TXD0-TXD15 according to the transmission protocol. The TLK2711 transceiver chip converts the received parallel data into serial data after 8b / 10b encoding and sends it to the ultra-thin coaxial line. The TLK2711 transceiver chip is a clock input pin, which is used to configure the serial data transmission rate. In this embodiment, the clock frequency is 100MHz and the serial data rate is 2Gbps.

[0025] The first extremely fine coaxial line 4, the second extremely fine coaxial line 5, the third extremely fine coaxial line 6, the fourth extremely fine coaxial line 7, the fifth extremely fine coaxial line 8, and the sixth extremely fine coaxial line 9 are used to transmit three pairs of CML differential signals output by the first detector transmitting interface circuit 1, the second detector transmitting interface circuit 2, and the third detector transmitting interface circuit 3 to the rigid-flexible board 10. The length of the extremely fine coaxial line is determined according to demand. In this embodiment, the length is 1100 mm.

[0026] The rigid-flex board 10 is composed of a flexible board part, a rigid board part I, and a rigid board part II. The thickness of the flexible board is 0.36 mm, and two layers of rolled copper are used. The length is determined according to the rotation angle required by the shaft system. In this embodiment, the length is 350 mm. The first extremely fine coaxial line 4, the second extremely fine coaxial line 5, the third extremely fine coaxial line 6, the fourth extremely fine coaxial line 7, the fifth extremely fine coaxial line 8, and the sixth extremely fine coaxial line 9 are welded to the rigid board part I; the seventh extremely fine coaxial line 11, the eighth extremely fine coaxial line 12, the ninth extremely fine coaxial line 13, the tenth extremely fine coaxial line 14, the eleventh extremely fine coaxial line 15, and the twelfth extremely fine coaxial line 16 are welded to the rigid board part II; the rigid board part I and the rigid board part II are fixed on the structural parts respectively. The characteristic impedance of the differential signals CML1, CML2, and CML3 in the entire rigid-flex board is 100Ω.

[0027] The seventh very fine coaxial line 11, the eighth very fine coaxial line 12, the ninth very fine coaxial line 13, the tenth very fine coaxial line 14, the eleventh very fine coaxial line 15, and the twelfth very fine coaxial line 16 transmit the three pairs of CML differential signals of the rigid-flex board to the receiving interface circuit 17. The length of the very fine coaxial line is determined according to the requirements. In this embodiment, the length is 1000 mm.

[0028] The receiving interface circuit 17 is composed of an FPGA chip, a TLK2711 transceiver chip I, a TLK2711 transceiver chip II, and a TLK2711 transceiver chip III. The serial port at the input end of the TLK2711 transceiver chip I is connected to the seventh and eighth extremely fine coaxial lines to receive the high-speed serial image signal of the first detector sending interface circuit, and the parallel port RXD0-RXD15 at the output end is connected to the FPGA to send the serial-to-parallel converted signal to the FPGA, and the FPGA receives the parallel port data according to the clock signal RXCLK output by the TLK2711 transceiver chip I. The serial port at the input end of the TLK2711 transceiver chip II is connected to the ninth and tenth extremely fine coaxial lines to receive the high-speed serial image signal of the second detector sending interface circuit, and the parallel port RXD0-RXD15 at the output end is connected to the FPGA to send the serial-to-parallel converted signal to the FPGA, and the FPGA receives the parallel port data according to the clock signal RXCLK output by the TLK2711 transceiver chip II. The serial port at the input end of the TLK2711 transceiver chip I II is connected to the eleventh and twelfth extremely fine coaxial lines to receive the high-speed serial image signal of the third detector sending interface circuit. The parallel port RXD0-RXD15 at the output end is connected to the FPGA to send the serial-to-parallel converted signal to the FPGA. The FPGA receives the parallel port data according to the clock signal RXCLK output by the TLK2711 transceiver chip III.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A device for transmitting high-speed signals in a rotating device, characterized in that: It includes a detector transmitting interface circuit, a rigid-flexible board 10, and a receiving interface circuit; multiple detector transmitting interface circuits are connected to the input end of the rigid-flexible board 10 through an extremely fine coaxial line, and the output end of the rigid-flexible board 10 is connected to the receiving interface circuit through an extremely fine coaxial line. The rotating device includes a fixed axis and a rotating shaft installed in the fixed axis. One end of the rigid-flexible board 10 is fixed to the outer wall of the rotating shaft and is wound on the rotating shaft, and the other end is fixedly connected to the inner wall of the fixed axis.

2. The device for transmitting high-speed signals in a rotating device according to claim 1, characterized in that: The rotation angle of the shaft is less than 360 degrees.

3. The device for transmitting high-speed signals in a rotating device according to claim 1, characterized in that: The characteristic impedance of the ultra-fine coaxial line is 50 ohms.

4. The device for transmitting high-speed signals in a rotating device according to claim 1, characterized in that: The image signal of each detector transmission interface circuit is sent to the first very fine coaxial line and the second very fine coaxial line.

5. The device for transmitting high-speed signals in a rotating device according to claim 1, characterized in that: The detector sending interface circuit includes an FPGA chip, a transceiver chip and a crystal oscillator; the crystal oscillator is connected to the clock input pin of the FPGA chip and the transceiver chip respectively.

6. The device for transmitting high-speed signals in a rotating device according to claim 5, characterized in that: The FPGA chip is used to collect image signals and send the processed image signals to the transceiver chip according to the transmission protocol. The transceiver chip converts the received parallel data into serial data after encoding and sends it to the ultra-fine coaxial cable.

7. The device for transmitting high-speed signals in a rotating device according to claim 1, characterized in that: The length of the ultra-fine coaxial line is determined according to requirements.

8. A device for transmitting high-speed signals in a rotating device according to any one of claims 1 to 7, characterized in that: The rigid-flex board 10 consists of a flexible board part, a rigid board part I, and a rigid board part II; the rigid board part I and the rigid board part II are connected by the flexible board part.

9. The device for transmitting high-speed signals in a rotating device according to claim 8, characterized in that: The thickness of the flexible board is 0.36mm, and it uses 2 layers of rolled copper. The length is determined according to the rotation angle required by the shaft system. In this embodiment, the length is 350mm. The first extremely fine coaxial line 4, the second extremely fine coaxial line 5, the third extremely fine coaxial line 6, the fourth extremely fine coaxial line 7, the fifth extremely fine coaxial line 8, and the sixth extremely fine coaxial line 9 are welded to the rigid board part I; the seventh extremely fine coaxial line 11, the eighth extremely fine coaxial line 12, the ninth extremely fine coaxial line 13, the tenth extremely fine coaxial line 14, the eleventh extremely fine coaxial line 15, and the twelfth extremely fine coaxial line 16 are welded to the rigid board part II; the rigid board part I and the rigid board part II are fixed on the structural parts respectively. The characteristic impedance of the differential signals CML1, CML2 and CML3 in the entire rigid-flexible board is 100Ω.

10. The device for transmitting high-speed signals in a rotating device according to claim 1, characterized in that: The receiving interface circuit 17 includes an FPGA chip and multiple transceiver chips; the serial port at the input end of the transceiver chip is connected to two extremely fine coaxial cables to receive the high-speed serial image signal of the corresponding detector sending interface circuit; the output end of the transceiver chip is connected to the FPGA chip to send the serial-to-parallel converted signal to the FPGA chip, and the FPGA chip receives the parallel port data according to the clock signal output by the transceiver chip.

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