A Ka-band simultaneous and co-frequency high-precision microwave time-frequency transfer device

Abstract

The present application discloses a Ka-band co-time co-frequency high-precision microwave time-frequency transfer device, belonging to the technical fields of time-frequency transfer and precision measurement. The present application adopts a co-time co-frequency full-duplex (CCFD) technical architecture, and has the capabilities of high-precision comparison measurement of simultaneously transmitting and receiving signals on a Ka-band wireless microwave link, and online self-closed-loop time-delay calibration test, and can support the performance evaluation of high-performance atomic clocks and the generation, transfer, and comparison measurement of high-precision microwave time-frequency signals in complex space-ground environments.

Description

Technical Field

[0001] This application belongs to the technical field of time-frequency transfer and precision measurement, and particularly relates to a Ka-band simultaneous and co-frequency high-precision microwave time-frequency transfer device. Background Art

[0002] Common time-frequency signal transfer 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 orbital error, dynamic Doppler frequency shift, ionosphere / troposphere factors, etc. in the complex space-ground environment, different error source weakening or elimination technical methods such as model error correction, Doppler elimination, satellite common-view, and triple-frequency / double-frequency combination are usually adopted, which can achieve nanosecond and sub-nanosecond time transfer accuracy. However, it is becoming increasingly difficult to measure and transfer time-frequency signals with higher precision, and the scale and functional complexity of the spaceborne equipment relied on by the above methods are very large, and it cannot be quickly upgraded and iterated in the short term.

[0003] At the same time, in recent years, with the rapid development of space atomic clock technology and its gradual application in engineering, the accuracy and stability of spaceborne clock signal sources have been continuously improved. In particular, the stability of the optical frequency standard reference signal of the new type of optical atomic clock has been improved to 10 -17 ~10 -18 or even higher levels. Therefore, it is necessary to build higher-precision microwave time-frequency transfer technical means and product forms to support the performance evaluation of high-performance new atomic clocks, high-precision time-frequency transfer, precision measurement and other applications. Summary of the Invention

[0004] The purpose of this application is to disclose a Ka-band simultaneous and co-frequency high-precision microwave time-frequency transfer device, which can support the performance evaluation of high-performance atomic clocks and the generation, transfer and comparison measurement of high-precision microwave time-frequency signals in the complex space-ground environment, in order to overcome the problems of the prior art.

[0005] The purpose of this application is achieved by the following technical solutions:

[0006] A Ka-band simultaneous and co-frequency high-precision microwave time-frequency transfer device, the microwave time-frequency transfer device includes:

[0007] An optoelectronic frequency synthesis unit, which receives an external time-frequency reference signal and converts it into a local clock signal and a local oscillator signal in the millimeter-wave band 、 and sequentially outputs them to a precision measurement and control unit, an up-conversion unit, and a down-conversion unit;

[0008] A precision measurement and control unit, which generates a local second pulse signal and time information according to the clock signal and generates a high-performance baseband intermediate-frequency transmission signal It is sent to the up-conversion unit for up-conversion frequency spectrum conversion; meanwhile, it receives the received intermediate-frequency signal sent by the down-conversion unit Perform precise measurement, data processing, and working state control;

[0009] Up-conversion unit, the up-conversion unit up-converts the local oscillator signal output by the optoelectronic frequency synthesis unit and the intermediate-frequency transmission signal output by the precise measurement and control unit to perform up-conversion frequency conversion and output a radio-frequency transmission signal to the transmitting antenna unit and output a coupled transmission signal S0 to the cancellation signal synthesis unit;

[0010] Down-conversion unit, the down-conversion unit down-converts the local oscillator signal output by the optoelectronic frequency synthesis unit and the radio-frequency received signal output by the receiving antenna unit to perform down-conversion frequency conversion and output an intermediate-frequency received signal to the precise measurement and control unit for receiving processing, and the frequency of the radio-frequency transmission signal is equal to the frequency of the radio-frequency received signal ;

[0011] Cancellation signal synthesis unit, the cancellation signal synthesis unit controls the signal amplitude / phase / delay of the coupled transmission signal S0, and then sends the synthesized local radio-frequency signal S2 to the down-conversion unit for radio-frequency signal cancellation processing, and down-converts the coupled transmission signal S0 to synthesize a reference intermediate-frequency signal S3 for baseband signal cancellation processing;

[0012] Transmitting antenna and receiving antenna, the transmitting antenna and receiving antenna complete the wireless conversion of the transmitting signal and the receiving signal in the same frequency and at the same time in space.

[0013] According to a preferred embodiment, the process of suppressing and receiving the same-frequency self-interference signal by the microwave time-frequency transfer device includes:

[0014] 1) Obtain the interference signal C0 output by the receiving antenna according to the EIRP of the transmitting signal in the millimeter-wave band and the isolation degree between the transmitting and receiving antennas and output the interference signal power as P C0 =EIRP - IL S ;

[0015] 2) Send the local radio-frequency signal S2 to the input port of the down-conversion unit to perform cancellation processing with the interference signal C0, and obtain the cancelled signal C1 output by the down-conversion unit;

[0016] 3) Perform baseband signal cancellation processing on the reference intermediate frequency signal S3 synthesized by down-converting the coupled transmission signal S0 and the signal C1 to obtain the signal C2 after baseband cancellation;

[0017] 4) Dynamically adjust the amplitudes / phases / time delays of the signals S1, S2, and S3 according to the system measurement / communication signal-to-noise ratio constraint. Through baseband signal reception processing of the signal C2, obtain and output the time-frequency ratio measurement data of the microwave signal: carrier / pseudo-code measurement values, time information, and Doppler parameters.

[0018] According to a preferred embodiment, the signal C2 after baseband cancellation contains three signal components: the received channel noise signal, the self-interference residual signal, and the received external useful signal. Among them, the power of the self-interference residual signal is comparable to that of the received channel noise signal and will not affect the normal reception of the external useful signal.

[0019] According to a preferred embodiment, when the microwave time-frequency transfer device enters the time-frequency ratio comparison mode,

[0020] Send a command to receive signals from other satellites through an immediate command / delayed command, and switch to the measurement process of receiving signals from other satellites;

[0021] At this time, process the useful signal in the received signal C2. By dynamically adjusting the amplitudes / phases / time delays of the signals S1, S2, and S3, under the condition of ensuring the system measurement / communication signal-to-noise ratio constraint, output the time-frequency ratio measurement results of the device, including: carrier / pseudo-code measurement values, time information, and Doppler parameters.

[0022] According to a preferred embodiment, when the microwave time-frequency transfer device enters the non-time-frequency ratio comparison mode,

[0023] Send a command to receive signals from its own satellite through an immediate command / delayed command, and switch to the measurement process of receiving signals from its own satellite;

[0024] At this time, process the self-interference residual signal in the received signal C2. By dynamically adjusting the amplitudes / phases / time delays of the signals S1, S2, and S3, under the condition of ensuring the system measurement / communication signal-to-noise ratio constraint, output the self-closed-loop calibration measurement results of the device, including: self-calibration carrier / pseudo-code measurement values, time information, and Doppler parameters.

[0025] According to a preferred embodiment, the radio frequency transmission signal The corresponding conversion relationship is .

[0026] According to a preferred embodiment, the intermediate frequency received signal The corresponding conversion relationship is .

[0027] According to a preferred embodiment, the optoelectronic frequency synthesis unit receives an external time-frequency reference signal, which is an atomic clock signal.

[0028] According to a preferred embodiment, the precision measurement and control unit can not only receive external input PPS signals, platform time codes, position information, dynamic compensation parameters, and control instruction information, but also maintain the time synchronization between the local PPS and time information and the external PPS and time codes. The output measurement data is uploaded and stored via a data bus for data analysis and processing.

[0029] 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.

[0030] The main solution of the present application and its various further alternative solutions can be freely combined to form multiple solutions, all of which are solutions that can be adopted and claimed in the present application. Those skilled in the art can understand that there are various combinations according to the prior art and common general knowledge after understanding the solution of the present application, all of which are the technical solutions to be protected in the present application and will not be enumerated here.

[0031] Advantages of the present application:

[0032] Different from the traditional multi-link frequency division and co-frequency time division transceiver working technical systems, the present invention has the characteristics of high-precision microwave signal broadcasting and receiving processing with a wide beam spatial coverage of the ground, and has the capabilities of high-performance microwave time-frequency signal generation, high-precision microwave signal broadcasting with a wide beam spatial coverage of the ground, and picosecond-level high-precision time-frequency comparison measurement, supporting the performance evaluation of high-performance atomic clocks and high-precision time-frequency transfer in complex satellite-ground environments.

[0033] The present invention adopts the co-time co-frequency full duplex (CCFD) technical system, enabling the two-end devices (this device) of the microwave link time-frequency transfer system applicable to the satellite-ground wireless environment to have technical advantages such as easy frequency pairing, simple frequency planning, simultaneous and continuous operation of the transmitted and received signals, and support for two-way measurement / communication integrated design.

[0034] By virtue of the characteristics of different signal components in the self-interference residual signal of the device itself, the present invention not only realizes the compatibility and flexible switching between two working modes of high-precision time-frequency comparison measurement and online closed-loop calibration test of Ka-band microwave signals, but also can complete the rapid self-check of the device's on-orbit operating state and parameter adjustment, with the characteristics of supporting on-orbit automated testing. Brief Description of the Drawings

[0035] Figure 1 It is a block diagram of the composition of the Ka-band co-time co-frequency high-precision microwave time-frequency transfer device of the present application;

[0036] Figure 2 It is a flowchart for supporting simultaneous co-frequency signal reception and processing and high-precision time-frequency comparison measurement;

[0037] Figure 3 It is a schematic diagram of the working mode process for supporting high-precision time-frequency comparison measurement and online self-closed-loop testing;

[0038] Figure 4 It is the C / N0 verification result of the simultaneous co-frequency microwave time-frequency signal comparison receiver in the Ka-band wireless link;

[0039] Figure 5 It is the verification result of the measurement performance of the simultaneous co-frequency microwave time-frequency signal comparison in the Ka-band wireless link. Specific implementation manners

[0040] The following uses specific specific examples to illustrate the implementation manners of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0041] It should be noted that: Similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. In the description of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "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 indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood in specific situations.

[0042] In addition, it should be pointed out in the present application that in the present application, if the specifically involved structure, connection relationship, position relationship, power source relationship, etc. are not specifically written, then the structure, connection relationship, position relationship, power source relationship, etc. involved in the present application are all known to those skilled in the art on the basis of the prior art without creative labor.

[0043] Reference Figures 1 to 3As shown in the figure, the present application discloses a Ka-band co-time co-frequency high-precision microwave time-frequency transfer device, which adopts the technical architecture of co-time co-frequency full duplex (CCFD). It has the functions of high-precision comparison measurement of simultaneously transmitting and receiving signals on a Ka-band wireless microwave link and online self-closed-loop time delay calibration test, and can support the performance evaluation of high-performance atomic clocks and the generation, transfer, and comparison measurement of high-precision microwave time-frequency signals in complex space-ground environments.

[0044] The microwave time-frequency transfer device includes: 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.

[0045] Preferably, the optoelectronic frequency synthesis unit receives an external time-frequency reference signal (new atomic clock signal) and converts it into a local clock signal and a local oscillator signal in the millimeter-wave band 、 , and sequentially outputs them to the precision measurement and control unit, the up-conversion unit, and the down-conversion unit.

[0046] Preferably, the precision measurement and control unit generates a local second pulse signal (local PPS) and time information according to the clock signal and generates a high-performance baseband intermediate-frequency transmission signal to be sent to the up-conversion unit for up-conversion frequency conversion; at the same time, it receives the received intermediate-frequency signal sent by the down-conversion unit for precision measurement, data processing, and working state control.

[0047] Furthermore, the precision measurement and control unit can not only receive external input PPS signals, 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 uploading and storage through a data bus for data analysis and processing.

[0048] Furthermore, 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.

[0049] Preferably, the up-conversion unit performs up-conversion frequency conversion on the local oscillator signal output by the optoelectronic frequency synthesis unit and the intermediate-frequency transmission signal output by the precision measurement and control unit, and outputs a radio-frequency transmission signal to the transmitting antenna unit, and outputs a coupled transmission signal S0 to the cancellation signal synthesis unit. The radio-frequency transmission signal The corresponding conversion relationship is . According to actual needs, the upper sideband or lower sideband signal can be selected, and necessary low-noise amplification and filtering processing are performed inside the upconversion unit to support on-demand adjustment of the output power of the transmitted signal.

[0050] Preferably, the downconversion unit downconverts the local oscillator signal output by the optoelectronic frequency synthesis unit and the RF received signal output by the receiving antenna unit to perform downconversion frequency conversion and output an intermediate-frequency received signal to the precision measurement and control unit for reception processing. The corresponding conversion relationship is , and the frequency of the RF transmitted signal is equal to the frequency of the RF received signal . According to actual needs, the upper sideband or lower sideband signal can be selected, and necessary low-noise amplification and filtering processing are performed inside the downconversion unit to support adaptive dynamic adjustment of the signal power of the receiving branch.

[0051] Preferably, the cancellation signal synthesis unit controls the signal amplitude / phase / delay of the coupled transmitted signal S0, and then sends the synthesized local RF signal S2 to the downconversion unit for RF signal cancellation processing, and downconverts the coupled transmitted signal S0 to synthesize a reference intermediate-frequency signal S3 for baseband signal cancellation processing.

[0052] Preferably, the transmitting antenna and the receiving antenna complete the wireless conversion of the transmitted signal and the received signal with the same frequency and at the same time. The transmitting antenna and the receiving antenna have high transceiver isolation characteristics. The interference signal reaching the receiving antenna after spatial suppression of the RF transmitted signal is S1. In addition, the transmitting antenna and the receiving antenna also have high phase center stability and wide beam spatial coverage characteristics.

[0053] Preferably, the process of suppressing and receiving the self-interference signal with the same frequency by the microwave time-frequency transfer device includes:

[0054] 1) Obtain the interference signal C0 output by the receiving antenna according to the EIRP of the transmitted signal in the millimeter wave band and the isolation degree between the transmitting and receiving antennas , and the output interference signal power is P C0 =EIRP - IL S ;

[0055] 2) Send the local RF signal S2 to the input port of the downconversion unit to cancel the interference signal C0, and obtain the canceled signal C1 output by the downconversion unit;

[0056] 3) Perform baseband signal cancellation processing on the reference intermediate frequency signal S3 synthesized by down-converting the coupled transmission signal S0 and the signal C1 to obtain the signal C2 after baseband cancellation;

[0057] The signal C2 after baseband cancellation contains three signal components: the received channel noise signal, the self-interference residual signal, and the received external useful signal. Among them, the power of the self-interference residual signal is comparable to that of the received channel noise signal, and it is ensured that it will not affect the normal reception of the external useful signal.

[0058] 4) According to the system measurement / communication signal-to-noise ratio constraint, dynamically adjust the amplitudes / phase / delays of the signals S1, S2, and S3. By performing baseband signal reception processing on the signal C2, obtain and output the microwave signal time-frequency ratio measurement data: carrier / pseudo-code measurement values, time information, Doppler parameters.

[0059] Through the process of suppressing and receiving the co-frequency self-interference signal, the problem of the influence of the co-frequency transmission signal in the millimeter wave band of the device itself on the receiving end is solved, and it supports the receiving and processing of co-frequency signals simultaneously and high-precision time-frequency ratio measurement.

[0060] In order to enable the device to have high-precision time-frequency ratio measurement and online self-closed-loop delay calibration test, utilize the C2 signal after baseband cancellation to support the high-precision time-frequency ratio measurement and the online self-closed-loop calibration test working mode as Figure 3 shown.

[0061] Specifically, when the microwave time-frequency transfer device enters the time-frequency ratio mode, send and receive the signal instruction of other satellites through the immediate instruction / delay instruction, and switch to the measurement process of receiving the signal of other satellites; at this time, receive and process the useful signal in the C2 signal, and by dynamically adjusting the amplitudes / phase / delays of the signals S1, S2, and S3, under the condition of ensuring the system measurement / communication signal-to-noise ratio constraint, output the time-frequency ratio measurement results of the device, including: carrier / pseudo-code measurement values, time information, Doppler parameters.

[0062] Specifically, when the microwave time-frequency transfer device enters the non-time-frequency ratio mode, send and receive the signal instruction of its own satellite through the immediate instruction / delay instruction, and switch to the measurement process of receiving the signal of its own satellite; at this time, receive and process the self-interference residual signal in the C2 signal, and according to the system measurement / communication signal-to-noise ratio constraint, by dynamically adjusting the amplitudes / phase / delays of the signals S1, S2, and S3, under the condition of ensuring the system measurement / communication signal-to-noise ratio constraint, output the self-closed-loop calibration measurement results of the device, including: self-calibration carrier / pseudo-code measurement values, time information, Doppler parameters.

[0063] The output time-frequency measurement data, including but not limited to: carrier / pseudo-code 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.

[0064] Embodiment 1

[0065] To verify the correctness of this application, a prototype of a payload for low-earth-orbit satellite-borne microwave time-frequency transfer is designed according to Figure 1 、 Figure 2 and Figure 3 shown. An integrated design of an external payload is adopted, and the spatial simultaneous and co-frequency signal format is designed as:

[0066]

[0067] Where: represents the spreading code number on the same carrier frequency point, with values of 1, 2, 3..., and the spreading code number can be configured as required; is the amplitude of the measurement branch signal; is the spreading code sequence of the measurement branch; is the data code sequence modulated by the measurement branch; is the carrier frequency of the RF transmission signal; is the initial phase of the carrier of the measurement branch; is the amplitude of the communication branch signal; is the spreading code sequence of the communication branch; is the data code sequence modulated by the communication branch; is the initial phase of the carrier of the communication branch.

[0068] Refer to Figure 4 and Figure 5 shown. A new type of optical frequency comb signal with a 200 MHz repetition frequency and 1550 nm is selected as the spatial time-frequency reference signal. Under the input conditions of the external time-frequency optical frequency comb signal and the PPS signal, the prototype works in the millimeter-wave band. The modulation method of the spatial simultaneous and co-frequency transceiver signal selects the QPSK code division multiple access spread spectrum system. According to the above methods and steps, the C / N0 loss at the receiving end of the Ka-band simultaneous and co-frequency microwave time-frequency comparison measurement device during the operation of the self-interference transmission signal is about 3-4 dB, achieving a pseudo-code measurement accuracy of the order of ten picoseconds and a carrier measurement accuracy of the order 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 on the ground, and high-precision time-frequency comparison measurement, and can support the performance evaluation of high-performance atomic clocks and precision measurement and other scenario applications.

[0069] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included within 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 down-converts the coupled transmission signal S0 to synthesize the reference intermediate frequency signal S3 for baseband signal cancellation processing; 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; 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) The reference intermediate frequency signal S3 synthesized by down-converting the coupled transmission signal S0 is subjected to baseband signal cancellation processing with the signal C1 to obtain a 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 processing on signal C2: carrier / pseudocode measurement value, time information, and Doppler parameters; 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. 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.

2. The microwave time-frequency transfer device according to claim 1, 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.

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

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

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

6. 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.

7. The microwave time-frequency transfer device according to claim 6, 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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