CN114152928A - Non-contact type rotating slip ring and photoelectric data transmission system of X-band marine solid continuous wave navigation radar - Google Patents
Non-contact type rotating slip ring and photoelectric data transmission system of X-band marine solid continuous wave navigation radar Download PDFInfo
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- CN114152928A CN114152928A CN202111543276.0A CN202111543276A CN114152928A CN 114152928 A CN114152928 A CN 114152928A CN 202111543276 A CN202111543276 A CN 202111543276A CN 114152928 A CN114152928 A CN 114152928A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
- G01S7/415—Identification of targets based on measurements of movement associated with the target
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
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Abstract
The invention discloses a non-contact type rotating slip ring and photoelectric data transmission system of a solid-state continuous wave navigation radar for an X-band ship, which comprises a slip ring lower circuit board, a primary magnetic core and coil, a secondary magnetic core and coil, a slip ring upper circuit board, a rotating bearing, a slip ring shell, a radar terminal signal control processing and acquisition system and a solid-state continuous wave radar transmitting and receiving front end, wherein the slip ring upper circuit board comprises a rectifying and filtering module, a multi-path power supply voltage stabilizing module, a photoelectric transmitting module and a photoelectric receiving module, the slip ring lower circuit board comprises a voltage conversion module, a full-bridge direct current-to-alternating current module, a photoelectric transmitting module and a photoelectric receiving module, and the primary magnetic core and the coil comprise a primary magnetic core and a primary coil. The service life of the slip ring can be prolonged to the maximum extent. Meanwhile, in order to reduce cost, the whole rotary slip ring only uses a pair of magnetic cores to transmit power required by the front end of the radar, and the hollow physical structure of the magnetic cores is used for realizing transmission of control signals and radar echo data by adopting photoelectric communication.
Description
Technical Field
The invention relates to the technical field of X-band marine solid-state continuous wave navigation radars, in particular to a non-contact rotary slip ring and photoelectric data transmission system of an X-band marine solid-state continuous wave navigation radar.
Background
In recent years, the solidification of the marine navigation radar has been accelerated. Wherein solid state continuous wave navigation radar becomes a compelling focus. The solid continuous wave navigation radar has the characteristics of small transmitting power (no radiation damage to people), high distance resolution, small distance blind area, low price, long service life, good reliability and the like, and becomes an important development direction of future navigation radars.
Different with traditional navigation radar, solid-state continuous wave radar adopts the structure of transmission receiving double antenna, and in order to improve radar performance and reduce cost, whole solid-state continuous wave radar transceiver front-end system is located behind the radar antenna, follows the antenna and rotates together, and radar terminal signal control handles collection system and is located radar antenna below gear box (not rotating together along with the antenna). And a power supply, a control signal and a received radar video echo signal of a front-end system of the solid-state radar transceiver are transmitted between the front end of the radar and a radar terminal signal processing and collecting system through the rotating slip ring.
Therefore, the quality of the rotary slip ring is directly related to the performance and the service life of the whole solid-state continuous wave radar. With the development of radar solid-state, the service life of the front end of the frequency modulation continuous wave radar transceiver is longer and longer, and at the moment, the service life of the rotary slip ring becomes a key for limiting the service time of the whole radar, so how to improve the service life of the rotary slip ring with lower cost is a key research direction in the slip ring design field.
Disclosure of Invention
The invention provides a non-contact rotary slip ring and photoelectric data transmission system of a solid-state continuous wave navigation radar for an X-band ship, which is used for transmitting a required power supply to the front end of a solid-state continuous wave transceiver rotating along with an antenna, controlling signals and transmitting echo digital sampling signals received by a radar to a radar terminal signal control processing acquisition system.
The invention is realized by the following technical scheme:
a non-contact rotary slip ring and photoelectric data transmission system of a solid continuous wave navigation radar for an X-band ship comprises a slip ring lower circuit board, a primary magnetic core and coil, a secondary magnetic core and coil, a slip ring upper circuit board, a rotary bearing, a slip ring shell, a radar terminal signal control processing acquisition system and a solid continuous wave radar transmitting and receiving front end, wherein the slip ring lower circuit board, the primary magnetic core and coil, the secondary magnetic core and coil, the slip ring upper circuit board and the rotary bearing are all arranged in the slip ring shell, the slip ring upper circuit board comprises a rectification filtering module, a multi-path power supply voltage stabilizing module, a photoelectric transmitting module and a photoelectric receiving module, the slip ring lower circuit board comprises a voltage conversion module, a direct current full-bridge current-transmitting module, a photoelectric transmitting module and a photoelectric receiving module, the primary magnetic core and coil comprise a primary magnetic core and a primary coil, and the secondary magnetic core and coil comprise a secondary magnetic core and a secondary coil, the lower circuit board of the slip ring is fixedly arranged in the radar terminal gear box, the primary magnetic core is arranged on the lower circuit board of the slip ring, the primary coil is nested in the primary magnetic core, the primary magnetic core and the primary coil are fixed on the lower circuit board of the slip ring through a plastic lantern ring, the secondary magnetic core and the secondary coil are fixed on the upper circuit board of the slip ring, the upper circuit board of the slip ring is fixed on a rotating bearing, and a photoelectric transmitting module and a photoelectric receiving module which are positioned at the central positions of the lower circuit board and the upper circuit board of the slip ring along with the rotation of the antenna, and a through hole between the primary magnetic core and the secondary magnetic core is used as a channel for transmitting a light source to transmit a control signal sent to the transmitting and receiving front end of the solid continuous wave radar by the radar terminal signal control processing acquisition system and a radar echo sampling signal transmitted reversely.
In a preferred embodiment, the radar terminal signal control processing acquisition system respectively uses a 12V direct-current voltage signal, a radar front-end control signal and a four-way full-bridge control signal to control a signal of a power MOS switch tube to be input into the lower circuit board of the slip ring through a signal input socket on the back of the lower circuit board of the slip ring.
As a preferred embodiment, a certain gap is reserved between the primary magnetic core and the secondary magnetic core through structural fixation, if the gap is too small, the secondary magnetic core may touch the primary magnetic core during the rotation process, but if the gap is too large, the power transmission efficiency of the space rotary transformer is reduced, through the structural design, the distance between the primary magnetic core and the secondary magnetic core is ensured to be about 1 mm, so that the secondary coil can be ensured not to be in friction contact with the primary coil during the rotation process, and when the primary magnetic core, the secondary magnetic core, the primary coil and the secondary coil are selected, the influence of the 1 mm gap is required to be considered during the design of the efficiency and the loss of the rotary transformer.
As a preferred embodiment, the solid-state continuous wave radar transmits and receives the front end, induce the voltage on the primary coil into the secondary coil through electromagnetic induction, then output after the voltage stabilization through the rectification filter module on the circuit board on the upper portion of the slip ring.
As a preferred embodiment, the circuit board on the upper portion of the slip ring is further designed with a voltage checking module for detecting each detected power supply to ensure stable operation, the voltage conversion module converts the 12V voltage input by the radar terminal signal control processing and acquisition system into the power supply voltage required by each module through a plurality of switching power supply chips, and the photoelectric receiving module is high in noise sensitivity and is powered by a low-noise linear power supply chip.
As a preferred embodiment, the full-bridge DC-AC module consists of two power amplification driving chips (two power amplification driving tubes are respectively arranged inside each chip) and two power switch MOS field effect tubes (two power switch MOS field effect tubes are respectively arranged inside each chip), the two power switch MOS field effect tubes in each chip are connected in a push-pull mode, four groups of control signals input by the radar terminal signal control processing acquisition system pass through the two power amplification driving chips, the grid electrodes of the four power switch MOS field effect transistors are controlled in a differential mode, direct-current voltage is converted into alternating-current square wave signals, in order to avoid the fact that the power switch MOS field effect transistors connected in a push-pull mode are conducted and burnt up and down, the duty ratio of each path of differential control signals is 40% at most, the total duty ratio of the two paths is 80%, and the rest 20% of differential control signals ensure that the push-pull circuit cannot be conducted up and down when the switches are switched.
As a preferred embodiment, the photoelectric sending module adopts a high-speed infrared light emitting diode as a transmitting light source, a control signal from the radar terminal signal control processing acquisition system is transmitted through the light emitting diode, the photoelectric receiving module adopts a high-sensitivity PIN photodiode, and receives a radar echo digital sampling signal transmitted by a photoelectric transmitting module on a circuit board on the upper part of the slip ring, but because a photoelectric conversion current signal received by the high-sensitivity PIN photodiode is very weak, a corresponding low-noise current amplifying circuit needs to be designed behind the high-sensitivity PIN photodiode to control noise and amplify the received current signal, then the current signal is converted into a voltage signal through a current-voltage converting circuit, and the voltage signal is compared with a self-adaptive threshold and then output to the radar terminal signal control processing acquisition system.
As a preferred embodiment, according to the input voltage and current of the primary coil, the voltage and current output by the secondary coil are required, the magnetic core is made of ferrite material, the working frequency is set to 250KHZ, in order to ensure that the magnetic core is not saturated when working, the magnetic flux density is set to 0.05 Tesla when working, because the continuous wave radar needs to have good environmental adaptability, the design temperature rise of the whole rotary transformer is controlled within 20 degrees when in design, because the working frequency of 250kHz is adopted, the skin depth of the current when the coil is transmitted is considered, the routing widths of the primary coil and the secondary coil are determined, meanwhile, the circuit loss when full-bridge direct current-to-alternating current conversion and envelope detection filtering are considered, the power of the whole rotary transformer can be obtained according to the input power and the output power, then the corresponding magnetic core coefficient is calculated, and the magnetic core size meeting the requirement can be selected, since data transmission through photoelectric transceiving is required, a pot core (pot core) is selected when the core is selected, a photoelectric transmitting and receiving light transmitting hole at the center of the core is used as a light transmission channel, and the winding turns of the primary coil and the secondary coil can be obtained according to a Faraday electromagnetic induction formula after the efficiency of the rotary transformer and input and output voltages and currents are considered.
As a preferred embodiment, the rectifying and filtering module performs filtering processing after envelope detection on an alternating voltage square wave signal induced by the secondary coil to obtain a direct current signal, because a ripple wave of the direct current signal is relatively large, the direct current signal must pass through the multi-path power supply voltage stabilizing module to obtain a better direct current voltage signal, and finally the voltages of +5V, -5V, +3.3V and +1.2 required by the radar transmitting and receiving front end are obtained through multi-path voltage stabilizing design. The +5V and-5V are used for supplying power to analog circuits in the photoelectric transmitting module and the photoelectric receiving module, and the +3.3V and the 1.2V are used for supplying power to digital circuits in the photoelectric transmitting module and the photoelectric receiving module.
As a preferred embodiment, the multi-path power supply voltage stabilizing module on the upper circuit board of the slip ring is to detect each detected power supply to ensure the operation stability thereof in order to ensure the correct power supply voltage, and the photoelectric transmitting module and the photoelectric receiving module in the upper circuit board of the slip ring and the photoelectric transmitting module and the photoelectric receiving module in the lower circuit board of the slip ring have the same function.
The inventive principle of the present application: the rotating slip ring adopted in the market at present mainly adopts an electric brush contact mode, the cost is high, and the inside of the slip ring can be broken after the rotating slip ring is used for a period of time, so that the performance and the service life of the slip ring are influenced. The invention adopts a space gap type rotary transformer and an exquisite photoelectric communication design to transmit power supply, control and radar echo data sampling signals required by the front end of the marine solid continuous wave navigation radar in an X wave band. The input 12V direct current voltage signal is converted into various power supply voltages required by a circuit board at the lower part of the slip ring, the direct current voltage is converted into an alternating current voltage signal through a full-bridge direct current-to-alternating current module, the converted alternating current voltage is connected with a primary coil embedded in a primary magnetic core, an induced alternating current square wave signal is generated on a secondary coil embedded in a secondary magnetic core through electromagnetic induction, the alternating current square wave signal is converted into 10V direct current voltage through a rectifying and filtering module on the circuit board at the upper part of the slip ring, and then the direct current voltage of 5V, -5V, 3.3V or 1.2V is realized through a multi-path power supply voltage stabilizing module and is used for supplying power to the transmitting and receiving front end of the solid continuous wave radar.
Has the advantages that: the service life of the slip ring can be improved to the maximum extent, since the entire invention is based on contactless energy and data transmission. Meanwhile, in order to reduce cost, the whole rotary slip ring only uses a pair of magnetic cores to transmit power required by the front end of the radar, and the transmission of control signals and radar echo data is achieved by utilizing a hollow physical structure of the magnetic cores and adopting photoelectric communication.
Drawings
Fig. 1 is a block diagram of a non-contact type rotating slip ring and photoelectric data transmission system of a solid-state continuous wave navigation radar for an X-band ship according to the present application.
FIG. 2a is a schematic front view of a circuit board at the lower part of the slip ring;
fig. 2b is a schematic front view of the upper circuit board of the slip ring.
FIG. 3a is a schematic diagram of a reverse structure of a circuit board at the lower part of the slip ring;
fig. 3b is a schematic diagram of the reverse structure of the upper circuit board of the slip ring.
Fig. 4 is a schematic side structure view of the non-contact rotating slip ring and photoelectric data transmission system of the X-band marine solid-state continuous wave navigation radar of the present application.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.
As shown in fig. 1-4, it is a block diagram of a non-contact low-cost rotating slip ring and photoelectric data transmission system of a solid-state continuous wave navigation radar for X-band ship, mainly composed of a slip ring lower circuit board 3, a primary magnetic core and coil, a secondary magnetic core and coil, a slip ring upper circuit board 1, a rotating bearing and a slip ring housing. The slip ring lower circuit board 3 mainly comprises a voltage conversion module, a full-bridge direct current transfer module and a photoelectric sending and receiving module. The method mainly converts an input 12V direct current voltage signal into various power supply voltages required by a circuit board 3 at the lower part of the slip ring, and then converts the direct current voltage into an alternating current voltage signal through a full-bridge conversion module. The converted ac voltage is connected to a primary coil 42 nested in a primary core 41, and an induced ac square wave signal can be generated by electromagnetic induction on a secondary coil 22 nested in a secondary core 21. The signal is converted into 10V direct current voltage through a rectification filter module 12 of a slip ring upper layer circuit board 1, then the direct current voltage of 5V, 3.3V, 1.2V and the like is realized through a multi-path power supply voltage stabilizing module, and the direct current voltage is used for supplying power to the front end of the solid continuous wave radar transceiver. And the photoelectric transmitting and receiving module 7 is positioned at the center positions of the slip ring upper circuit board 1 and the slip ring lower circuit board 3, and utilizes the hollow structures in the magnetic core and the coil as light propagation media for transmitting a control signal sent to the front end of the continuous wave radar transceiver by the radar terminal signal control processing and acquisition system and a radar echo sampling signal transmitted in the reverse direction.
According to the voltage and current input by the primary coil 42 and the voltage and current output by the secondary coil 22, the magnetic core is made of ferrite material, the working frequency is set to 250KHZ, in order to ensure that the magnetic core is not saturated when working, the magnetic flux density is set to 0.05 Tesla when working, because the continuous wave radar needs to have good environmental adaptability, the design temperature rise of the whole rotary transformer is controlled within 20 degrees when in design, because the working frequency of 250kHz is adopted, the skin depth of the current when the coil is transmitted is considered, the wiring width of the primary coil 42 and the secondary coil 22 is determined, meanwhile, the circuit loss when full-bridge direct current to alternating current conversion and envelope detection filtering are adopted is considered, the power of the whole rotary transformer can be obtained according to the input power and the output power, then the corresponding magnetic core coefficient is calculated, and the size of the magnetic core meeting the requirement can be selected, since data transmission through photoelectric transceiving is required, a pot core (pot core) is selected when the core is selected, a photoelectric transmitting and receiving light transmitting hole at the center of the core is used as a light transmission channel, and the winding turns of the primary coil and the secondary coil can be obtained according to a Faraday electromagnetic induction formula after the efficiency of the rotary transformer and input and output voltages and currents are considered.
As shown in fig. 2, 3 and 4, fig. 2a is a schematic front view of a lower circuit board of a slip ring, which includes a primary magnetic core 41, a primary coil 42, a magnetic core fixing module 5, and a light transmitting and receiving hole 61 for optical transmission and reception, the primary coil 42 is nested inside the primary magnetic core 41 and connected to the lower circuit board 3 of the slip ring through a pin, and the primary magnetic core 41 and the primary coil 42 are fixed to the lower circuit board 3 of the slip ring through a plastic collar. Fig. 2b is a schematic diagram of the front side structure of the slip ring upper circuit board, the secondary core 21 and the secondary coil 22 are fixed on the slip ring upper circuit board 1, and the slip ring upper circuit board 1 is fixed on the rotation bearing and rotates with the antenna.
Fig. 3a is a schematic diagram of a reverse structure of a circuit board at the lower part of the slip ring, which includes a signal input socket 31, a photoelectric transmitting and receiving module (i.e. a photoelectric transmitting module and a photoelectric receiving module) 7, and a full-bridge dc-ac module 32, wherein a radar terminal signal control processing and collecting system inputs 12V dc voltage signals, radar front-end control signals and four full-bridge control signals to the circuit board at the lower part of the slip ring through the signal input socket 31 at the back of the circuit board 3 at the lower part of the slip ring. 12V direct current voltage generated by the radar terminal signal control processing acquisition system, four paths of full-bridge control signals and differential control signals for controlling the radar transmitting and receiving front end are input into a circuit board at the lower part of the slip ring through a signal input socket. The 12V direct current voltage is converted into 5V voltage by an LP2985 low-noise voltage stabilizing chip of IT company and is used for supplying power to the photoelectric transmitting and receiving module. After being filtered by a capacitor inductor, the 12V direct current voltage is directly used as the power supply voltage of a full-bridge direct current-to-alternating current circuit driving amplifier and a power switch MOS tube. The four-path full-bridge control signal firstly passes through 2 two-path 1.5A high-speed power MOS field effect transistor driving amplifiers TC4427 and then is connected to the grid electrodes of 2 two-path N-channel power switch MOS field effect transistors FDS6912, the two-path MOS field effect transistors in each FDS6912 are connected in a push-pull mode, and 2-path push-pull output is connected to two poles of a primary coil.
Fig. 3b is a schematic diagram of a reverse structure of the upper circuit board of the slip ring, which includes a signal output socket 11, a photoelectric transmitting and receiving module (i.e., a photoelectric transmitting module and a photoelectric receiving module) 7, and a rectifying and filtering module 12. Full-bridge direct current and alternating current conversion improves the efficiency of power conversion, but also puts higher voltage withstanding requirements on the power switch tube. FDS6912 can withstand a drain voltage of 30V and therefore can fully meet design requirements. However, in order to ensure that the two tubes cannot be conducted simultaneously when the power switching tubes are used for push-pull output, the two push-pull output signals are 180 degrees out of phase. And the duty ratio of each path of signal is 40%, 20% of the duty ratio is reserved, and meanwhile, a cut-off area is reserved, so that the situation that the push-pull cannot form a short circuit to burn out a power switch tube is ensured. The differential radar front-end control signal controls the base level of the NPN type BFR193 amplifier after being converted by a differential-to-single-ended chip, the collector of the amplifier is connected with the cathode of a high-speed infrared light-emitting diode, and the anode of the light-emitting diode is connected with 5V voltage converted by an LP2985 low-noise voltage stabilizing chip. When the control signal of the front end of the radar is 1, the BFR193 amplifier is conducted, and after current flows through the light-emitting diode, the light-emitting diode sends an infrared signal to the photoelectric receiving module on the circuit board on the upper part of the slip ring. When the radar front end control signal is 0, the BFR193 amplifier is turned off, and the light emitting diode is also turned off.
After sensing infrared signals (radar video sampling signals) transmitted by a photoelectric emission module of a circuit board on the upper portion of the slip ring, the reverse biased PIN photodiode converts optical signals into electric signals, but the electric signals are very weak at the moment, current amplification is carried out through a transconductance current amplifier, and after differential output, current-voltage conversion is carried out through an integrated operational amplifier to obtain received electric signal waveforms. Because the photoelectric receiving performance of the slip ring is changed in the rotating process, in order to keep the waveform amplitudes of output signals consistent, a self-adaptive comparison electrical frequency is used as a comparison threshold and is compared with received electrical signals through a comparator, and finally radar echo sampling signals with consistent amplitudes are obtained. After passing through the single-ended to differential chip, the signal is transmitted to the radar terminal signal control processing acquisition system through the signal input socket 31 for subsequent algorithm processing and echo display.
To ensure that the coil and core meet the power and temperature rise design requirements, the number of turns of the primary coil 42 is designed to be two turns and the number of turns of the secondary coil 22 is six turns. The primary coil 42 has a line width of 1.2 mm and a thickness of 3 ounces, taking into account skin effects and the like. The secondary coil 22 has a width of 1 millimeter and a thickness of 1 ounce. The magnetic core is selected to be of a pouring structure, and when the centers of the upper magnetic core and the lower magnetic core are aligned, the middle photoelectric transmitting and receiving light hole is used as a light transmission channel of the photoelectric transmitting and receiving module. After the secondary coil 22 induces the alternating voltage signal transmitted by the primary coil 42, the alternating voltage signal is rectified by a diode on the circuit board 1 on the upper portion of the slip ring, and is filtered by a plurality of capacitors, and then the rectified alternating voltage signal passes through an LM22670 voltage stabilizing chip of TI company to obtain stable output voltage. The multi-path power supply voltage stabilizing module converts the voltage output by the LM22670 into various voltages required by the radar transmitting and receiving front end. The photoelectric transmitting and receiving module on the upper circuit board 1 of the slip ring works in a mode basically consistent with that of the lower circuit board 3 of the slip ring. Finally, the circuit board 1 on the upper part of the slip ring carries out differential conversion on the generated voltages and the radar control signals obtained by the photoelectric receiving module and then transmits the converted voltages to the front end of the solid-state radar transceiver through the signal output socket.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
- A non-contact rotary slip ring and photoelectric data transmission system of a solid-state continuous wave navigation radar for an X-band ship is characterized by comprising a slip ring lower circuit board, a primary magnetic core and coil, a secondary magnetic core and coil, a slip ring upper circuit board, a rotary bearing, a slip ring shell, a radar terminal signal control processing and acquisition system and a solid-state continuous wave radar transmitting and receiving front end, wherein the slip ring lower circuit board, the primary magnetic core and coil, a secondary magnetic core and coil, the slip ring upper circuit board and the rotary bearing are all arranged in the slip ring shell, the slip ring upper circuit board comprises a rectification filtering module, a multi-path power supply voltage stabilizing module, a photoelectric transmitting module and a photoelectric receiving module, the slip ring lower circuit board comprises a voltage conversion module, a full-bridge direct current-to-current conversion module, a photoelectric transmitting module and a photoelectric receiving module, the primary magnetic core and coil comprise a primary magnetic core and a secondary coil, and the secondary magnetic core and coil comprise a secondary magnetic core and a secondary coil, the lower circuit board of the slip ring is fixedly arranged in the radar terminal gear box, the primary magnetic core is arranged on the lower circuit board of the slip ring, the primary coil is nested in the primary magnetic core, the primary magnetic core and the primary coil are fixed on the lower circuit board of the slip ring through a plastic lantern ring, the secondary magnetic core and the secondary coil are fixed on the upper circuit board of the slip ring, the upper circuit board of the slip ring is fixed on a rotating bearing, and a photoelectric transmitting module and a photoelectric receiving module which are positioned at the central positions of the lower circuit board and the upper circuit board of the slip ring along with the rotation of the antenna, and a through hole between the primary magnetic core and the secondary magnetic core is used as a channel for transmitting a light source to transmit a control signal sent to the transmitting and receiving front end of the solid continuous wave radar by the radar terminal signal control processing acquisition system and a radar echo sampling signal transmitted reversely.
- 2. The non-contact rotary slip ring and photoelectric data transmission system of the X-band marine solid-state continuous wave navigation radar according to claim 1, wherein the radar terminal signal control processing and acquisition system respectively inputs 12V direct-current voltage signals, radar front-end control signals and four-way full-bridge control signals to the slip ring lower circuit board through a signal input socket on the back of the slip ring lower circuit board.
- 3. The non-contact rotary slip ring and photoelectric data transmission system of the X-band marine solid-state continuous wave navigation radar according to claim 1, wherein a certain gap is ensured by structural fixation, if the gap is too small, the secondary magnetic core may touch the primary magnetic core during rotation, but the gap is too large, which reduces the power transmission efficiency of the space rotary transformer, and by structural design, the gap between the primary magnetic core and the secondary magnetic core is ensured to be about 1 mm, which ensures that the secondary coil does not frictionally contact the primary coil during rotation, and when the primary magnetic core, the secondary magnetic core, the primary coil and the secondary coil are selected, the influence of the 1 mm gap is taken into consideration during the design of the efficiency and loss of the rotary transformer.
- 4. The non-contact rotary slip ring and photoelectric data transmission system of the X-band marine solid-state continuous wave navigation radar according to claim 1, wherein the solid-state continuous wave radar transmits and receives the front end, induces the voltage on the primary coil into the secondary coil through electromagnetic induction, and then outputs the voltage after being stabilized by a rectifying and filtering module on a circuit board on the upper portion of the slip ring.
- 5. The non-contact rotary slip ring and photoelectric data transmission system of the X-band marine solid-state continuous wave navigation radar according to claim 1, wherein a voltage check module is further designed on a circuit board on the upper portion of the slip ring to detect each detected power supply and ensure stable operation of the detected power supply, the voltage conversion module converts 12V voltage input by the radar terminal signal control processing acquisition system into power supply voltage required by each module through a plurality of switching power supply chips, and the photoelectric receiving module is highly sensitive to noise, so that the photoelectric receiving module is powered by a low-noise linear power supply chip alone.
- 6. The non-contact rotating slip ring and photoelectric data transmission system of the X-band marine solid-state continuous wave navigation radar according to claim 1, it is characterized in that the full-bridge DC-AC module consists of two power amplification driving chips and two power switch MOS field effect transistors, the two power switch MOS field effect transistors in each chip are connected in a push-pull mode, four groups of control signals input by the radar terminal signal control processing acquisition system pass through the two power amplification driving chips, the grid electrodes of the four power switch MOS field effect transistors are controlled in a differential mode, direct-current voltage is converted into alternating-current square wave signals, in order to avoid the fact that the power switch MOS field effect transistors connected in a push-pull mode are conducted and burnt up and down, the duty ratio of each path of differential control signals is 40% at most, the total duty ratio of the two paths is 80%, and the rest 20% of differential control signals ensure that the push-pull circuit cannot be conducted up and down when the switches are switched.
- 7. The non-contact rotary slip ring and photoelectric data transmission system of X-band marine solid-state continuous wave navigation radar according to claim 1, wherein the photoelectric transmitting module employs a high-speed infrared light emitting diode as a transmitting light source to transmit a control signal from the radar terminal signal control processing and acquisition system through the light emitting diode, the photoelectric receiving module employs a high-sensitivity PIN photodiode to receive a radar echo digital sampling signal transmitted from the photoelectric transmitting module on the upper circuit board of the slip ring, but since the photoelectric conversion current signal received by the high-sensitivity PIN photodiode is very weak, a corresponding low-noise current amplifying circuit is required to be designed behind the high-sensitivity PIN photodiode to control noise and amplify the received current signal, and then the current signal is converted into a voltage signal by the current-voltage converting circuit, and then the signal is compared with a self-adaptive threshold and then output to a radar terminal signal control processing acquisition system.
- 8. The non-contact rotating slip ring and optoelectronic data transmission system of X-band marine solid-state continuous wave aerial radar as claimed in claim 1, wherein the magnetic core is made of ferrite material, the operating frequency is set to 250KHZ, and the magnetic flux density is set to 0.05 Tesla in order to ensure that the magnetic core does not saturate during operation, since the continuous wave radar needs to have good environmental adaptability, the temperature rise of the whole rotary transformer is controlled within 20 degrees during design, and since the operating frequency is 250kHz, the skin depth of current during coil transmission is considered, the routing widths of the primary and secondary coils are determined, and the circuit loss during full-bridge DC-to-AC conversion and envelope detection filtering is considered, the power of the whole rotary transformer can be obtained according to the input power and the output power, then the corresponding magnetic core coefficient is calculated, and the size of the magnetic core meeting the requirement can be selected.
- 9. The non-contact rotary slip ring and photoelectric data transmission system of the X-band marine solid-state continuous wave navigation radar according to claim 1, wherein the rectifying and filtering module is used for carrying out filtering processing on an alternating voltage square wave signal induced by the secondary coil after enveloping and detecting the alternating voltage square wave signal to obtain a direct current signal, the direct current signal has relatively large ripple waves and needs to pass through a multi-path power supply voltage stabilizing module to obtain a better direct current voltage signal, and the voltages of +5V, -5V, +3.3V and +1.2 required by the front end of the radar transceiver are finally obtained through multi-path voltage stabilizing design. The +5V and-5V are used for supplying power to analog circuits in the photoelectric transmitting module and the photoelectric receiving module, and the +3.3V and the 1.2V are used for supplying power to digital circuits in the photoelectric transmitting module and the photoelectric receiving module.
- 10. The non-contact rotary slip ring and photoelectric data transmission system of the X-band marine solid-state continuous wave guided radar according to claim 1, wherein the multi-path power supply voltage stabilization module on the slip ring upper circuit board is used for ensuring correct power supply voltage, detecting each power supply after detection and ensuring stable operation of the multi-path power supply voltage stabilization module, and the photoelectric transmission module and the photoelectric reception module in the slip ring upper circuit board have the same functions as the photoelectric transmission module and the photoelectric reception module in the slip ring lower circuit board.
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