Ka-frequency-band simultaneous same-frequency high-precision microwave time-frequency transmission device

Abstract

The invention discloses a Ka-band simultaneous same-frequency high-precision microwave time-frequency transmission device, belongs to the technical field of time-frequency transmission and precision measurement, and adopts a Co-time Co-free Full Duplex (CCFD) technology architecture, and the Ka-band simultaneous same-frequency high-precision microwave time-frequency transmission device has the advantages that the Ka-band simultaneous same-frequency high-precision microwave time-frequency transmission device is simple in structure, convenient to operate and high in practicability. The device works in a Ka-band wireless microwave link, simultaneously transmits and receives signals at the same frequency, realizes high-precision comparison measurement and on-line self-closed-loop time delay calibration test, and can support high-performance atomic clock performance evaluation and high-precision microwave time-frequency signal generation, transmission and comparison measurement in a satellite-ground complex environment.

Description

Technical Field

[0001] The present application belongs to the technical field of time-frequency transfer and precision measurement, and in particular, relates to a Ka-band simultaneous and same-frequency high-precision microwave time-frequency transfer device. Background Art

[0002] Commonly used time-frequency signal transmission and comparison methods include GNSS common view method, satellite two-way time-frequency transfer method, etc. Due to the influence of error sources such as orbit error, dynamic Doppler frequency shift, ionosphere / troposphere factors in the complex environment between the satellite and the ground, different error source weakening or elimination technical methods such as model error correction, Doppler elimination, satellite common view and triple-frequency / dual-frequency combination are usually adopted to achieve nanosecond and sub-nanosecond time transfer accuracy. However, it is increasingly difficult to measure and transmit higher-precision time-frequency signals. In addition, the satellite-borne equipment relied on by the above methods is of large scale and functional complexity, and cannot be quickly upgraded and iterated in the short term.

[0003] At the same time, with the rapid development of space atomic clock technology and its gradual application in engineering in recent years, the accuracy and stability of satellite-borne clock signal sources have been continuously improved. In particular, the new optical atomic clock has improved the stability of the optical frequency standard reference signal to 10 -17 ~10 -18 Even higher levels require the construction of higher-precision microwave time-frequency transmission technical means and product forms to support applications such as performance evaluation of high-performance new atomic clocks, high-precision time-frequency transmission and precision measurement. Summary of the invention

[0004] The purpose of this application is to overcome the problems of the prior art and disclose a Ka-band simultaneous and high-precision microwave time-frequency transmission device that can support high-performance atomic clock performance evaluation and high-precision microwave time-frequency signal generation, transmission and comparative measurement in complex satellite-ground environments.

[0005] The purpose of this application is achieved through the following technical solutions: A Ka-band simultaneous and high-precision microwave time-frequency transmission device, the microwave time-frequency transmission device comprising: The optoelectronic frequency synthesis unit receives an external time-frequency reference signal and converts it into a local clock signal. and millimeter wave band local oscillator signal , , and output to the precision measurement and control unit, the up-conversion unit, and the down-conversion unit in sequence; A precision measurement and control unit, wherein the precision measurement and control unit is based on a clock signal Generate local second pulse signal and time information to generate high-performance baseband intermediate frequency transmission signal The signal is sent to the up-conversion unit for up-conversion spectrum conversion; at the same time, the intermediate frequency signal sent by the down-conversion unit is received. Carry out precision measurement, data processing and working status control; An up-conversion unit converts the local oscillator signal output by the optoelectronic frequency synthesis unit into And the intermediate frequency transmission signal output by the precision measurement and control unit Perform up-conversion frequency conversion and output RF transmission signal to the transmitting antenna unit, and outputs the coupled transmitting signal S0 to the cancellation signal synthesis unit; A down-conversion unit converts the local oscillator signal output by the optoelectronic frequency synthesis unit into and the RF receiving signal output by the receiving antenna unit Perform down-conversion frequency conversion and output intermediate frequency received signal To the precision measurement and control unit for receiving and processing, and the RF transmission signal The frequency of the RF receiving signal The frequencies are equal; A cancellation signal synthesis unit, wherein the cancellation signal synthesis unit performs signal amplitude / phase / delay control on the coupled transmission signal S0, and then sends the synthesized local RF signal S2 to the down-conversion unit for RF signal cancellation processing, and simultaneously performs baseband signal cancellation processing on the down-conversion synthesized reference intermediate frequency signal S3; The transmitting antenna and the receiving antenna complete the wireless conversion of the transmitting signal and the receiving signal at the same frequency and in the same space.

[0006] According to a preferred embodiment, the microwave time-frequency transfer device performs the same-frequency self-interference signal suppression and reception processing process, including: 1) Based on the EIRP of the transmitted signal in the millimeter wave band and the isolation between the transmitting and receiving antennas Obtain the interference signal C0 output by the receiving antenna, and the output interference signal power is P C0 =EIRP - IL S ; 2) Send the local RF signal S2 to the input port of the down-conversion unit to cancel the interference signal C0, and obtain the canceled signal C1 output by the down-conversion unit; 3) Perform baseband signal cancellation processing on the reference intermediate frequency receiving signal S3 synthesized by down-converting the coupled transmission signal S0 and the signal C1 to obtain the signal C2 after baseband cancellation; 4) According to the system measurement / communication signal-to-noise ratio constraints, dynamically adjust the amplitude / phase / delay of S1, S2, and S3 signals, and obtain and output the microwave signal time-frequency comparison measurement data by performing baseband signal reception and processing on signal C2: carrier / pseudocode measurement value, time information, and Doppler parameters.

[0007] According to a preferred embodiment, after baseband cancellation, signal C2 includes three signal components: a received channel noise signal, a self-interference residual signal, and a received external useful signal, wherein the power of the self-interference residual signal is equivalent to the power of the received channel noise signal, so as not to affect the normal reception of the external useful signal.

[0008] According to a preferred embodiment, when the microwave time-frequency transfer device enters the time-frequency comparison mode, Send the command to receive other satellite signals through immediate command / delay command, and switch to the measurement process of receiving other satellite signals; At this time, the useful signal in the C2 signal is received and processed, and the amplitude / phase / delay of the S1, S2, and S3 signals are dynamically adjusted. Under the constraint of the system measurement / communication signal-to-noise ratio, the device time-frequency comparison measurement results are output, including: carrier / pseudocode measurement value, time information, and Doppler parameters.

[0009] According to a preferred embodiment, when the microwave time-frequency transfer device enters a non-time-frequency comparison mode, Send the command to receive the local satellite signal through the immediate command / delay command, and switch to the measurement process of receiving the local satellite signal; At this time, the self-interference residual signal in the C2 signal is received and processed, and the amplitude / phase / delay of the S1, S2, and S3 signals are dynamically adjusted. Under the constraint of the system measurement / communication signal-to-noise ratio, the device self-closed-loop calibration measurement results are output, including: self-calibration carrier / pseudocode measurement value, time information, and Doppler parameters.

[0010] According to a preferred embodiment, the radio frequency transmission signal The corresponding conversion relationship is .

[0011] According to a preferred embodiment, the intermediate frequency receiving signal The corresponding conversion relationship is .

[0012] According to a preferred embodiment, the external time-frequency reference signal received by the optoelectronic frequency synthesis unit is an atomic clock signal.

[0013] According to a preferred embodiment, the precision measurement and control unit can not only accept external input PPS signals and platform time codes, position information, dynamic compensation parameters and control instruction information, but also maintain the time synchronization of local PPS and time information with external PPS and time codes, and output measurement data for upload and storage via a data bus for data analysis and processing.

[0014] According to a preferred embodiment, the measurement data output by the precision measurement and control unit includes but is not limited to: carrier / pseudo-code measurement values, time information, working state parameters and temperature parameters.

[0015] The aforementioned main scheme of the present application and its further options can be freely combined to form multiple schemes, all of which are schemes that can be adopted and claimed for protection in the present application. After understanding the scheme of the present application, those skilled in the art can understand that there are multiple combinations based on the prior art and common knowledge, all of which are technical schemes to be protected by the present application, and they are not exhaustively listed here.

[0016] Beneficial effects of this application: Different from the traditional multi-link frequency division and co-frequency time division transceiver working technical system, the present invention has the characteristics of high-precision microwave signal broadcasting and receiving processing with wide beam airspace coverage to the ground, high-performance microwave time and frequency signal generation, high-precision microwave signal broadcasting with wide beam airspace coverage to the ground, and high-precision time and frequency comparison and measurement capabilities in the picosecond level, supporting high-performance atomic clock performance evaluation and high-precision time and frequency transmission in complex satellite-ground environments.

[0017] The present invention adopts the Co-time Co-frequency Full Duplex (CCFD) technical system, so that the two-end equipment (this device) suitable for the microwave link time-frequency transmission system in the satellite-to-ground wireless environment has the technical advantages of easy frequency pairing, simple frequency planning, simultaneous continuous operation of sending and receiving signals, and support for two-way measurement / communication integrated design.

[0018] The present invention makes use of the characteristics of different signal components in the signal after the residual self-interference of the device itself, not only realizing the compatibility and flexible switching of the two working modes of high-precision time-frequency comparison measurement of Ka-band microwave signals and online closed-loop calibration test, but also can complete the rapid self-check and parameter adjustment of the device's on-orbit operation status, and has the characteristics of supporting on-orbit automated testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a block diagram of the composition of the Ka-band simultaneous and high-precision microwave time-frequency transmission device of the present application; Figure 2 It is a flow chart that supports simultaneous same-frequency signal reception and processing and high-precision time-frequency comparison measurement; Figure 3 It is a flowchart of the working mode supporting high-precision time-frequency comparison measurement and online self-closed-loop test; Figure 4 It is the C / N0 verification result of the Ka-band wireless link and the same-frequency microwave time-frequency signal comparison at the receiving end; Figure 5 It is the performance verification result of the simultaneous and co-frequency microwave time-frequency signal comparison measurement of the Ka-band wireless link. DETAILED DESCRIPTION

[0020] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0021] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] In addition, the present application would like to point out that, in the present application, unless the specific structure, connection relationship, positional relationship, power source relationship, etc. are specifically written out, the structure, connection relationship, positional relationship, power source relationship, etc. involved in the present application are all known by those skilled in the art on the basis of the prior art without creative work.

[0023] refer to Figures 1 to 3 As shown, the present application discloses a Ka-band simultaneous and co-frequency high-precision microwave time-frequency transmission device, which adopts the simultaneous and co-frequency full-duplex technology (Co-time Co-frequency Full Duplex, CCFD) technical architecture, and has the ability to work in the Ka-band wireless microwave link simultaneously and co-frequency high-precision comparison measurement of receiving and transmitting signals and online self-closed-loop delay calibration test, and can support high-performance atomic clock performance evaluation and high-precision microwave time-frequency signal generation, transmission and comparison measurement capabilities in complex satellite-ground environments.

[0024] The microwave time-frequency transmission device comprises: an optoelectronic frequency synthesis unit, a precision measurement and control unit, an up-conversion unit, a down-conversion unit, a cancellation signal synthesis unit, a transmitting antenna and a receiving antenna.

[0025] Preferably, the optoelectronic frequency synthesis unit receives an external time-frequency reference signal (a new atomic clock signal) and converts it into a local clock signal. and millimeter wave band local oscillator signal , , and output to the precision measurement and control unit, up-conversion unit, and down-conversion unit in sequence.

[0026] Preferably, the precision measurement and control unit is based on the clock signal Generates local pulse per second signal (local PPS) and time information to generate high-performance baseband intermediate frequency transmission signal The signal is sent to the up-conversion unit for up-conversion spectrum conversion; at the same time, the intermediate frequency signal sent by the down-conversion unit is received. Carry out precise measurement, data processing and working status control.

[0027] Furthermore, the precision measurement and control unit can not only accept external input PPS signals and platform time codes, position information, dynamic compensation parameters and control instruction information, but also maintain the time synchronization of local PPS and time information with external PPS and time codes, and output measurement data for upload and storage through the data bus for data analysis and processing.

[0028] Furthermore, the measurement data output by the precision measurement and control unit includes but is not limited to: carrier / pseudo-code measurement value, time information, working state parameters and temperature parameters.

[0029] Preferably, the up-conversion unit converts the local oscillator signal output by the optoelectronic frequency synthesis unit into And the intermediate frequency transmission signal output by the precision measurement and control unit Perform up-conversion frequency conversion and output RF transmission signal To the transmitting antenna unit, and output the coupled transmitting signal S0 to the cancellation signal synthesis unit. The corresponding conversion relationship is According to actual needs, the upper sideband or lower sideband signal can be selected, and the necessary low-noise amplification and filtering processing can be performed inside the up-conversion unit to support the on-demand adjustment of the transmission signal output power.

[0030] Preferably, the down-conversion unit converts the local oscillator signal output by the optoelectronic frequency synthesis unit into and the RF receiving signal output by the receiving antenna unit Perform down-conversion frequency conversion and output intermediate frequency received signal To the precision measurement and control unit for receiving and processing, the corresponding conversion relationship is , and the RF transmission signal The frequency of the RF receiving signal According to actual needs, the upper sideband or lower sideband signal can be selected, and the necessary low-noise amplification and filtering processing can be performed inside the down-conversion unit to support adaptive dynamic adjustment of the receiving branch signal power.

[0031] Preferably, the cancellation signal synthesis unit performs signal amplitude / phase / delay control on the coupled transmission signal S0, and then sends the synthesized local RF signal S2 to the down-conversion unit for RF signal cancellation processing, and simultaneously performs baseband signal cancellation processing on the down-converted synthesized reference intermediate frequency signal S3.

[0032] Preferably, the transmitting antenna and the receiving antenna complete the wireless conversion of the transmitting signal and the receiving signal at the same frequency and at the same time. The transmitting antenna and the receiving antenna have high isolation characteristics for transmitting and receiving, and the RF transmitting signal The interference signal reaching the receiving antenna after spatial suppression is S1. In addition, the transmitting antenna and the receiving antenna also have the characteristics of high phase center stability and wide beam spatial coverage.

[0033] Preferably, the microwave time-frequency transmission device performs the same-frequency self-interference signal suppression and reception processing process including: 1) Based on the EIRP of the transmitted signal in the millimeter wave band and the isolation between the transmitting and receiving antennas Obtain the interference signal C0 output by the receiving antenna, and the output interference signal power is P C0 =EIRP - IL S ; 2) Send the local RF signal S2 to the input port of the down-conversion unit to cancel the interference signal C0, and obtain the canceled signal C1 output by the down-conversion unit; 3) Perform baseband signal cancellation processing on the reference intermediate frequency receiving signal S3 synthesized by down-converting the coupled transmission signal S0 and the signal C1 to obtain the signal C2 after baseband cancellation; After baseband cancellation, signal C2 contains three signal components: receiving channel noise signal, self-interference residual signal and receiving external useful signal. The power of the self-interference residual signal is equivalent to the power of the receiving channel noise signal, so it will not affect the normal reception of external useful signals.

[0034] 4) According to the system measurement / communication signal-to-noise ratio constraints, dynamically adjust the amplitude / phase / delay of S1, S2, and S3 signals, and obtain and output the microwave signal time-frequency comparison measurement data by performing baseband signal reception and processing on signal C2: carrier / pseudocode measurement value, time information, and Doppler parameters.

[0035] Through the co-frequency self-interference signal suppression and reception processing flow, the problem of interference from the co-frequency transmission signal in the millimeter wave band of the device itself on the receiving end is solved, and it supports simultaneous co-frequency signal reception processing and high-precision time-frequency comparison measurement.

[0036] In order to enable the device to have high-precision time-frequency comparison measurement and online self-closed-loop delay calibration test, the C2 signal after baseband cancellation supports high-precision time-frequency comparison measurement and online self-closed-loop calibration test working mode. Figure 3 shown.

[0037] Specifically, when the microwave time-frequency transfer device enters the time-frequency comparison mode, an instruction to receive other satellite signals is sent through an immediate instruction / delay instruction, and the measurement process of receiving other satellite signals is switched to; at this time, useful signals in the C2 signal are received and processed, and the amplitude / phase / delay of the S1, S2, and S3 signals are dynamically adjusted. Under the constraint of the system measurement / communication signal-to-noise ratio, the device time-frequency comparison measurement results are output, including: carrier / pseudocode measurement values, time information, and Doppler parameters.

[0038] Specifically, when the microwave time-frequency transfer device enters the non-time-frequency comparison mode, the instruction for receiving the local satellite signal is sent through an immediate instruction / delay instruction, and the local satellite signal measurement process is switched to receive the local satellite signal; at this time, the self-interference residual signal in the C2 signal is received and processed, and according to the system measurement / communication signal-to-noise ratio constraint, the S1, S2, and S3 signal amplitudes / phases / delays are dynamically adjusted. Under the constraint of the system measurement / communication signal-to-noise ratio, the device self-closed-loop calibration measurement results are output, including: self-calibration carrier / pseudocode measurement values, time information, and Doppler parameters.

[0039] The output time-frequency measurement data, including but not limited to: carrier / pseudocode measurement values, time information, Doppler parameters, etc., are uploaded and stored through the data bus for data post-processing and time-frequency comparison performance analysis to obtain high-precision time-frequency comparison results.

[0040] Example 1 In order to verify the correctness of this application, Figure 1 , Figure 2 and Figure 3 As shown in the figure, a prototype of microwave time-frequency transfer payload for low-orbit satellite is designed, which adopts the integrated design of extravehicular payload, and the format of simultaneous and same-frequency signals in space is designed as follows:

[0041] in: Indicates the number of the spreading code at the same carrier frequency, with values ​​of 1, 2, 3, etc. The spreading code number can be configured as needed; To measure the branch signal amplitude; To measure the branch spreading code sequence; A data code sequence for measuring branch modulation; is the carrier frequency of the RF transmission signal; To measure the initial phase of the branch carrier; is the communication branch signal amplitude; is the communication branch spreading code sequence; A data code sequence modulated for a communication branch; It is the initial phase of the communication branch carrier.

[0042] refer to Figure 4 and Figure 5 As shown, the space time-frequency reference signal uses a new type of optical frequency comb signal with a repetition rate of 200MHz and a repetition rate of 1550nm. Under the input conditions of external time-frequency optical frequency comb signal and PPS signal, the prototype works in the millimeter wave frequency band, and the spatial simultaneous and co-frequency signal modulation mode selects QPSK code division multiple access spread spectrum system. According to the above method and steps, the simultaneous and co-frequency microwave time-frequency comparison measurement device working in the Ka band can achieve a C / N0 loss of about 3~4dB at the receiving end when the self-interference transmission signal works, and achieves a pseudo-code measurement accuracy of tens of picoseconds and a carrier measurement accuracy of sub-picoseconds. It has the capabilities of high-performance microwave time-frequency signal generation, high-precision microwave signal broadcasting with wide beam spatial coverage to the ground, and high-precision time-frequency comparison measurement, and can support scene applications such as high-performance atomic clock performance evaluation and precision measurement.

[0043] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A Ka-band simultaneous and high-precision microwave time-frequency transmission device, characterized in that: The microwave time-frequency transmission device comprises: The optoelectronic frequency synthesis unit receives an external time-frequency reference signal and converts it into a local clock signal. and millimeter wave band local oscillator signal , , and output to the precision measurement and control unit, the up-conversion unit, and the down-conversion unit in sequence; A precision measurement and control unit, wherein the precision measurement and control unit is based on a clock signal Generate local second pulse signal and time information to generate baseband intermediate frequency transmission signal The signal is sent to the up-conversion unit for up-conversion spectrum conversion; at the same time, the intermediate frequency signal sent by the down-conversion unit is received. Carry out precision measurement, data processing and working status control; An up-conversion unit converts the local oscillator signal output by the optoelectronic frequency synthesis unit into And the intermediate frequency transmission signal output by the precision measurement and control unit Perform up-conversion frequency conversion and output RF transmission signal to the transmitting antenna unit, and outputs the coupled transmitting signal S0 to the cancellation signal synthesis unit; A down-conversion unit converts the local oscillator signal output by the optoelectronic frequency synthesis unit into and the RF receiving signal output by the receiving antenna unit Perform down-conversion frequency conversion and output intermediate frequency received signal To the precision measurement and control unit for receiving and processing, and the RF transmission signal The frequency of the RF receiving signal The frequencies are equal; A cancellation signal synthesis unit, wherein the cancellation signal synthesis unit performs signal amplitude / phase / delay control on the coupled transmission signal S0, and then sends the synthesized local RF signal S2 to the down-conversion unit for RF signal cancellation processing, and simultaneously performs baseband signal cancellation processing on the down-conversion synthesized reference intermediate frequency signal S3; The transmitting antenna and the receiving antenna complete the wireless conversion of the transmitting signal and the receiving signal at the same frequency and in the same space.

2. The microwave time-frequency transfer device according to claim 1, characterized in that: The microwave time-frequency transmission device performs the same-frequency self-interference signal suppression and reception processing process, which includes: 1) Based on the EIRP of the transmitted signal in the millimeter wave band and the isolation between the transmitting and receiving antennas Obtain the interference signal C0 output by the receiving antenna, and the output interference signal power is P C0 =EIRP - IL S ; 2) Send the local RF signal S2 to the input port of the down-conversion unit to cancel the interference signal C0, and obtain the canceled signal C1 output by the down-conversion unit; 3) Perform baseband signal cancellation processing on the reference intermediate frequency receiving signal S3 synthesized by down-converting the coupled transmission signal S0 and the signal C1 to obtain the signal C2 after baseband cancellation; 4) According to the system measurement / communication signal-to-noise ratio constraints, dynamically adjust the amplitude / phase / delay of S1, S2, and S3 signals, and obtain and output the microwave signal time-frequency comparison measurement data by performing baseband signal reception and processing on signal C2: carrier / pseudocode measurement value, time information, and Doppler parameters.

3. The microwave time-frequency transfer device according to claim 2, characterized in that: After baseband cancellation, signal C2 contains three signal components: receiving channel noise signal, self-interference residual signal and receiving external useful signal. The power of the self-interference residual signal is equivalent to the power of the receiving channel noise signal, so it will not affect the normal reception of external useful signals.

4. The microwave time-frequency transfer device according to claim 3, characterized in that: When the microwave time-frequency transfer device enters the time-frequency comparison mode, Send the command to receive other satellite signals through immediate command / delay command, and switch to the measurement process of receiving other satellite signals; At this time, the useful signal in the C2 signal is received and processed, and the amplitude / phase / delay of the S1, S2, and S3 signals are dynamically adjusted. Under the constraint of the system measurement / communication signal-to-noise ratio, the device time-frequency comparison measurement results are output, including: carrier / pseudocode measurement value, time information, and Doppler parameters.

5. The microwave time-frequency transfer device according to claim 3, characterized in that: When the microwave time-frequency transfer device enters the non-time-frequency comparison mode, Send the command to receive the local satellite signal through the immediate command / delay command, and switch to the measurement process of receiving the local satellite signal; At this time, the self-interference residual signal in the C2 signal is received and processed, and the amplitude / phase / delay of the S1, S2, and S3 signals are dynamically adjusted. Under the constraint of the system measurement / communication signal-to-noise ratio, the device self-closed-loop calibration measurement results are output, including: self-calibration carrier / pseudocode measurement value, time information, and Doppler parameters.

6. The microwave time-frequency transfer device according to claim 1, characterized in that: RF transmission signal The corresponding conversion relationship is .

7. The microwave time-frequency transfer device according to claim 1, characterized in that: IF receiving signal The corresponding conversion relationship is .

8. The microwave time-frequency transfer device according to claim 1, characterized in that: The optoelectronic frequency synthesis unit receives the external time and frequency reference signal as an atomic clock signal.

9. The microwave time-frequency transfer device according to claim 1, characterized in that: The precision measurement and control unit can not only accept external input PPS signals and platform time codes, position information, dynamic compensation parameters and control instruction information, but also maintain the time synchronization of local PPS and time information with external PPS and time codes, and output measurement data for upload and storage via the data bus for data analysis and processing.

10. The microwave time-frequency transfer device according to claim 9, characterized in that: The measurement data output by the precision measurement and control unit include but are not limited to: carrier / pseudo-code measurement values, time information, working state parameters and temperature parameters.

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