CN112688753B - High-precision transmission device for looped network double-channel time frequency - Google Patents

Abstract

The invention provides a looped network double-channel time frequency high-precision transmission device which comprises an optical fiber first interface and an optical fiber second interface, wherein a pulse per second signal and a frequency signal are transmitted between the optical fiber first interface and the optical fiber second interface through an optical fiber.

Description

Ring network dual-channel time-frequency high-precision transmission device

technical field

The invention relates to a ring network dual-channel transmission device, in particular to a ring network dual-channel time-frequency high-precision transmission device, which belongs to the technical field of time frequency.

Background technique

The current high-precision time-frequency output device uses the atomic and molecular energy level difference of the atomic clock as a reference signal to calibrate the crystal oscillator so that it outputs a standard frequency signal. It uses the signal generated by the atomic energy level transition to obtain the negative feedback correction signal used to correct the crystal oscillator after photoelectric conversion and signal processing, so that it can output a stable oscillation frequency for accurate calculation of time.

Due to the slight deviation in the frequency stability and accuracy of different atomic clocks, this deviation affects the accuracy of time and frequency output, resulting in that the time output by time and frequency output devices in various places cannot be completely synchronized, and the output time between each other has certain differences. sex.

At present, there have been proposed time-frequency local area network propagation schemes, but most of them are one-way propagation or partial one-way propagation, such as two-way propagation of pulse signals and one-way propagation of frequency signals. Because the precise position of the rising or falling edge of the second pulse signal is difficult to accurately locate, The accuracy of time transfer is prone to problems.

Usually, in the high-precision transmission of time and frequency, the transmission of the second pulse signal and the frequency signal are carried out separately. Although two channels are occupied, the frequency signal is often only used to eliminate the line delay, and only the second pulse signal is simply used as the time. The marking of the signal, so the accuracy of time transfer is difficult to improve.

In the prior art, there is also a method of using a single channel to transmit the second pulse signal and the frequency signal. Although the time accuracy of the single channel transmission is relatively high, in practical applications, the time accuracy of the single channel transmission is often higher than that of using need. In addition, the single-channel transmission method has poor short-term stability of the transmitted frequency signal, which makes it have higher requirements on the crystal oscillator, resulting in high system cost

In addition, in the high-precision transmission of time, the frequency signal is an analog quantity. When transmitting the time signal, it is necessary to consider the line delay. Usually, the A/D module is used to convert the frequency signal into a digital quantity, and then control the frequency phase of the transmission, so as to eliminate Line delay, but its adjustment speed is slow, and the frequency stability is insufficient, which restricts the further improvement of time transfer accuracy.

There is also an intermediate node device disclosed in the prior art. By setting an intermediate node device between the dual-channel time-frequency transmission devices, the time-frequency can be obtained at the intermediate node, and the effect of transmitting the time-frequency to multiple places can be achieved. However, the traditional The dual-channel time-frequency transfer device requires two sets of equipment at the remote end and the local end, which is not only costly but also complex.

Therefore, there is an urgent need to study a ring network dual-channel transmission device that can achieve safety, reliability, low noise, and more stable frequency transmission.

Contents of the invention

In order to solve the above-mentioned problems, the present inventors conducted intensive studies.

On the one hand, the present invention provides a dual-channel time-frequency high-precision transmission device for a ring network, including a first optical fiber interface and a second optical fiber interface, both of which are dual-channel optical fiber interfaces, and the first optical fiber interface The second pulse signal and the frequency signal are transmitted through the optical fiber between the interface and the second optical fiber interface;

The dual channel includes a first channel and a second channel, and the signals transmitted by the first channel and the second channel both have a second pulse signal and a frequency signal.

It includes a signal integrated modulation module, a signal detection demodulation module, a second pulse sending and receiving processing module, a crystal oscillator module and a signal acquisition and processing control module, wherein the signal integrated modulation module, signal detection demodulation module, second pulse sending and receiving processing module and the crystal oscillator module have Two, respectively the first signal integrated modulation module, the first signal detection and demodulation module, the first second pulse transmission and reception processing module, the first crystal oscillator module and the second signal integrated modulation module, the second signal detection and demodulation module, the second Two-second pulse sending and receiving processing module, second crystal oscillator module;

The signal synthesis modulation module is used for signal modulation and transmission, and modulates the second pulse signal and the frequency signal in the carrier wave;

The signal detection and demodulation module is used to demodulate the second pulse signal and the frequency signal in the carrier;

The first signal integrated modulation module is connected with the first second pulse sending and receiving processing module and the first crystal oscillator module, and the second signal integrated modulation module is connected with the second second pulse sending receiving processing module and the second crystal oscillator module;

The first signal detection and demodulation module is connected with the first second pulse sending and receiving processing module and the first signal acquisition processing control module, and the second signal detection and demodulation module is connected with the second second pulse sending and receiving processing module and the second crystal oscillator module;

The second pulse sending and receiving processing module is used to generate the second pulse signal, the first second pulse sending and receiving processing module can obtain the standard second pulse signal, generate the second pulse signal on the basis of the standard second pulse signal, and the second second pulse sending and receiving processing The module receives the second pulse signal demodulated by the second signal detection and demodulation module as a reference signal for generating the second pulse signal, generates the second second pulse signal, and transmits it to the second signal synthesis modulation module;

The crystal oscillator module is used to generate a frequency signal, the frequency signal generated by the first crystal oscillator module can be transmitted to the local second pulse sending and receiving processing module, the local signal synthesis modulation module and the first signal acquisition and processing control module, the frequency generated by the second crystal oscillator module The signal can be transmitted to the second second pulse sending and receiving processing module, the second signal synthesis modulation module and the signal acquisition and processing module;

The signal acquisition and processing control module compares the frequency signal output by the first crystal oscillator module, the standard frequency signal, the frequency signal output by the second crystal oscillator module, and the frequency signal demodulated by the first signal detection and demodulation module to obtain the frequency signal between the signals. Relative phase, by adjusting the phase of the output frequency signal of the phase shifting module, the phase of the output frequency signal of the first crystal oscillator module is indirectly controlled, and the phase of the frequency signal output by the second crystal oscillator module is consistent with the phase of the standard frequency signal.

The signal acquisition and processing control module includes a multi-channel A/D acquisition unit, a calculation unit and a D/A unit, wherein the A/D acquisition unit collects frequency signals, the calculation unit calculates the relative phase between each frequency signal, and the D/A unit The output controls the phase of the sine wave signal.

Between the signal acquisition and processing control module and the first signal detection and mediation module, the first crystal oscillator module, and the second crystal oscillator module, and before collecting standard frequency signals, there is also a down-conversion module.

Between the signal acquisition and processing control module and the first crystal oscillator module, a first frequency mixing and phase-locking module and a phase shifting module are arranged, and a second frequency mixing and phase-locking module is arranged between the second signal detection and demodulation module and the second crystal oscillator module module;

The phase-shifting module receives a standard frequency signal, which is connected to the signal acquisition and processing control module, changes the phase of the standard frequency signal according to the voltage output by the signal acquisition and processing control module D/A, and generates a phase-shifting frequency signal as the first mixing frequency The input signal of the phase lock module,

The frequency mixing and phase-locking module is used to adjust the output frequency of the crystal oscillator module, the frequency of the signal generated by the first crystal oscillator module is controlled by the first frequency mixing and phase-locking module, and the signal generated by the second crystal oscillator module is controlled by the second frequency mixing and phase-locking module Frequency of.

The first frequency mixing and phase-locking module is connected to the first signal detection module and the phase-shifting module, and controls the first crystal oscillator module according to the phase-shifting frequency signal and the frequency signal demodulated by the signal detection module,

On the other hand, the present invention also provides a dual-channel time-frequency high-precision transmission method of the ring network, which transmits the second pulse signal and the frequency signal through the dual-channel optical fiber between the first optical fiber interface and the second optical fiber interface to realize time-frequency transmission. Set the optical fiber dual-channel time-frequency high-precision transfer intermediate node device at any node on the dual-channel optical fiber to obtain high-precision time-frequency signals,

The phase delay drift of the device is obtained through digital measurement, and the phase correction is performed by controlling the phase shifting module, so that the phase of the frequency signal received by the second signal detection and demodulation module is consistent with the phase of the standard frequency signal.

According to the ring network dual-channel time-frequency high-precision transmission intermediate node device and method provided by the present invention, it has the following beneficial effects:

(1) Both the second pulse signal and the frequency signal are transmitted in two directions, and the time transmission accuracy is high;

(2) Adjust the frequency signal through the combination of digital control and analog control, with fast adjustment speed and low noise;

(3) The structure of the dual-channel time-frequency transmission device is simplified, and the possibility of obtaining time-frequency signals with high precision at any node position of the optical fiber is realized.

Description of drawings

Fig. 1 shows a schematic diagram of a ring network dual-channel time-frequency high-precision transmission device in a preferred embodiment.

Detailed ways

The features and advantages of the present invention will become clearer and clearer along with these exemplary descriptions through the detailed description of the present invention below.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as superior or better than other embodiments. While various aspects of the embodiments are shown in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

On the one hand, the present invention provides a dual-channel time-frequency high-precision transfer device for a ring network, including two dual-fiber interfaces, namely a first optical fiber interface and a second optical fiber interface, both of which are Two-channel optical fiber interface, connected by optical fiber.

According to the present invention, at any position in the middle of the optical fiber, an optical fiber dual-channel time-frequency high-precision transmission intermediate node device can be set to obtain time-frequency signals.

The optical fiber dual-channel time-frequency high-precision transmission intermediate node device is a device capable of recovering time-frequency signals at the optical fiber intermediate node. It connects the first optical fiber interface and the second optical fiber interface at the same time through the optical fiber, so that the optical fiber dual-channel time-frequency high-precision transmission intermediate node device can obtain high-precision time-frequency signals,

Further, the second pulse signal and the frequency signal can be transmitted through the optical fiber between the first optical fiber interface and the second optical fiber interface, and the phase of the frequency signal and the second pulse signal are used to indicate the marking time, wherein the second pulse signal is used as a rough time mark, and the frequency signal The phase is used as a fine mark of time to realize the precise transfer of time.

The dual channel includes a first channel and a second channel, and the signals transmitted by the first channel and the second channel both have a second pulse signal and a frequency signal.

According to the present invention, the ring network dual-channel time-frequency high-precision transmission device has a signal synthesis modulation module, a signal detection and demodulation module, a second pulse transmission and reception processing module, a crystal oscillator module and a signal acquisition and processing control module, as shown in Figure 1, Among them, there are two signal integrated modulation modules, signal detection and demodulation modules, second pulse transmission and reception processing modules, and crystal oscillator modules, which are respectively recorded as the first signal integrated modulation module, the first signal detection and demodulation module, and the first second pulse transmission and reception processing module. module, the first crystal oscillator module and the second signal synthesis modulation module, the second signal detection and demodulation module, the second second pulse sending and receiving processing module, and the second crystal oscillator module.

Specifically, the signal synthesis modulation module is used for signal modulation and transmission, and modulates the second pulse signal and the frequency signal in the carrier wave, wherein,

The first signal synthesis modulation module is connected with the first second pulse sending and receiving processing module and the first crystal oscillator module, which can receive the second pulse signal sent by the first second pulse sending and receiving processing module and the frequency signal sent by the first crystal oscillator module, and the second The pulse signal and the frequency signal are modulated onto the carrier and sent out through the first channel of the optical fiber first interface;

The second signal synthesis modulation module is connected with the second second pulse sending and receiving processing module and the second crystal oscillator module, and it can receive the second pulse signal sent by the second second pulse sending receiving processing module and the frequency signal sent by the second crystal oscillator module, and the second The pulse signal and the frequency signal are modulated onto the carrier and sent out through the second channel of the second optical fiber interface.

In a preferred implementation, the signal synthesis modulation module divides each second into two time periods, marked as T ₁ and T ₂ time periods. In the _T1 period, the second pulse signal is sent, and in the _T2 period, the frequency signal is sent. Further, in one second, the length of the T ₁ period is 100-800 ns, and the rest of the time is the T ₂ period.

The signal detection and demodulation module is used to demodulate the second pulse signal and the frequency signal in the carrier, wherein,

The first signal detection and demodulation module is connected with the first second pulse sending and receiving processing module and the first signal acquisition and processing control module, which can receive and demodulate the carrier signal transmitted by the second channel of the first optical fiber interface, and will demodulate the The second pulse signal is delivered to the first second pulse sending and receiving processing module, and the demodulated frequency signal is delivered to the first signal acquisition and processing control module;

The second signal detection and demodulation module is connected with the second second pulse sending and receiving processing module and the second crystal oscillator module, which can receive and demodulate the carrier signal transmitted by the first channel of the second optical fiber interface, and demodulate the second pulse The signal is transmitted to the second second pulse sending and receiving processing module, and the demodulated frequency signal is transmitted to the second crystal oscillator module.

The second pulse sending and receiving processing module is used to generate the second pulse signal, the second pulse signal is a high-low level signal, and the high-low level conversion of the second pulse signal is used to mark the beginning of each second, and the rising edge is used as the signal for the start of the second pulse . Further, the second pulse sending and receiving processing module is connected to the crystal oscillator module, and can obtain the frequency signal output by the crystal oscillator module. The frequency signal is a sine wave signal, and at the beginning of each second, the rising edge of the second pulse signal is aligned with the zero-crossing point of the frequency signal, so that the phase of the frequency signal and the second pulse signal can maintain a fixed alignment.

The first second pulse sending and receiving processing module can acquire the standard second pulse signal, and generate the second pulse signal on the basis of the standard second pulse signal.

Further, the first second pulse sending and receiving processing module can obtain the time delay advance, generate the second pulse signal in advance according to the time delay advance, and transmit it to the first signal synthesis modulation module.

Specifically, the first second pulse sending and receiving processing module first generates an initial second pulse signal when acquiring the time delay advance, and transmits the initial second pulse signal to the first signal synthesis modulation module and sends it out through the first optical fiber interface, The initial second pulse signal is transmitted along the optical fiber to the second interface of the optical fiber, demodulated by the second signal detection and demodulation module, and then passed to the second second pulse sending and receiving processing module, and the second second pulse sending and receiving processing module generates a new signal according to the received signal The second pulse signal, the second pulse signal is transmitted to the second signal integrated modulation module, modulated by the second signal integrated modulation module and sent out through the second channel of the second optical fiber interface, the signal is transmitted along the optical fiber to the first optical fiber interface, and passed through the first After demodulation by the signal detection and demodulation module, the second pulse signal is delivered to the first second pulse sending and receiving processing module. The first second pulse sending and receiving processing module measures the time interval between the signal transmitted to the first signal synthesis modulation module and the signal received by the first signal detection demodulation module, and subtracts the sending delay and receiving delay from this time interval Then divide by 2, and add the sending delay of the first optical fiber interface and the receiving delay after the second optical fiber interface to obtain the delay advance.

The sending delay, receiving delay, sending delay of the first optical fiber interface, and receiving delay after the second optical fiber interface are related to the performance of the device module, and are obtained through related performance tests after the device is produced.

The second second pulse sending and receiving processing module receives the second pulse signal demodulated by the second signal detection and demodulation module as a reference signal for generating the second pulse signal, and uses the zero-crossing position of the sine wave signal as the rising edge of the pulse to recover the second The pulse signal is transmitted to the second signal synthesis modulation module.

Specifically, the second second pulse sending and receiving processing module acquires the frequency signal output by the second crystal oscillator module, uses the zero-crossing point of the frequency signal as the rising edge of the second pulse, generates a plurality of pulse signals, and selects The pulse signal closest to the reference signal is used as the recovered second pulse signal.

The crystal oscillator module is used to generate frequency signals.

The frequency signal generated by the first crystal oscillator module can be transmitted to the local second pulse sending and receiving processing module, the local signal integrated modulation module and the first signal acquisition and processing control module;

The frequency signal generated by the second crystal oscillator module can be transmitted to the second second pulse sending and receiving processing module, the second signal synthesis modulation module and the signal acquisition and processing module.

The signal acquisition and processing control module is used to compare the frequency signal output by the first crystal oscillator module, the standard frequency signal, the frequency signal output by the second crystal oscillator module, and the frequency signal demodulated by the first signal detection and demodulation module to obtain each The relative phase between the signals is indirectly controlled by the phase adjustment of the output frequency signal of the phase shifting module to the phase of the output frequency signal of the first crystal oscillator module, so that the phase of the frequency signal output by the second crystal oscillator module is consistent with the phase of the standard frequency signal.

Specifically, the first signal acquisition and processing control module includes a multi-channel A/D acquisition unit, a calculation unit, and a D/A unit, wherein the A/D acquisition unit acquires frequency signals, and the calculation unit calculates the relative phase between each frequency signal , D/A unit output controls the phase of the sine wave signal.

In a preferred embodiment, between the first signal acquisition and processing control module and the first signal detection and mediation module, the first crystal oscillator module, and the second crystal oscillator module, and before collecting standard frequency signals, there is also a down conversion module Down-converting each frequency signal through the down-conversion module to reduce the frequency of the frequency signal, thereby reducing the performance requirements of the first signal acquisition and processing control module, so that the A/D acquisition unit can more accurately acquire the phase.

In a preferred embodiment, between the signal acquisition and processing control module and the first crystal oscillator module, a first frequency mixing phase-locking module and a phase shifting module are arranged, further, between the second signal detection and demodulation module and the second crystal oscillator A second frequency mixing and phase-locking module is arranged between the modules.

The phase-shifting module receives a standard frequency signal, which is connected to the signal acquisition and processing control module, changes the phase of the standard frequency signal according to the voltage value output by the signal acquisition and processing control module, and generates a phase-shifting frequency signal as the first mixing and phase-locking The input signal of the module.

The frequency mixing and phase-locking module is used to adjust the output frequency of the crystal oscillator module, the frequency of the signal generated by the first crystal oscillator module is controlled by the first frequency mixing and phase-locking module, and the signal generated by the second crystal oscillator module is controlled by the second frequency mixing and phase-locking module Frequency of.

Further, the first frequency mixing and phase-locking module is connected with the first signal detection module and the phase shifting module, and controls the first crystal oscillator module according to the frequency signal demodulated by the phase shifting frequency and the signal detection module, so that the output of the first crystal oscillator module After the frequency is transmitted to the second signal detection and demodulation module through the optical fiber, the frequency phase is the same as the standard frequency phase.

According to the present invention, the second frequency mixing and phase-locking module locks the output frequency of the second crystal oscillator module according to the received frequency signal output by the first crystal oscillator module, and further, the second crystal oscillator can be realized by adjusting the output frequency of the first crystal oscillator module. The output frequency of the module is consistent with the phase of the standard frequency signal.

In a preferred embodiment, the output frequency of the first crystal oscillator module is adjusted by the first frequency mixing and phase locking module, and the first frequency mixing and phase locking module receives the frequency signal output by the second crystal oscillator module and the standard transmitted by the phase shifting module Frequency signal, after mixing the two signals to control the first crystal oscillator module, change the output frequency of the first crystal oscillator module, so that the frequency signal received by the second frequency mixing and phase-locking module changes, and then through the second mixing and phase-locking module to change The output frequency of the second crystal oscillator module, so that the output frequency of the second crystal oscillator module is consistent with the phase of the standard frequency signal.

Since the adjustment of the output frequency of the crystal oscillator by the frequency mixing and phase-locking module is controlled and adjusted by an analog quantity, the present invention has the advantages of fast frequency and phase adjustment speed and high frequency stability.

The inventors found that each device in the device will cause phase drift during the transmission of the frequency signal, and with the long-term operation of the device, the phase drift of the frequency signal will accumulate, resulting in cumulative errors. In a preferred embodiment In the phase-shifting module, the standard frequency signal transmitted to the first mixing phase-locking module is phase-shifted to correct the influence of the phase drift caused by the device.

Specifically, the output frequency signal of the first crystal oscillator module is transmitted to the second frequency mixing and phase-locking module through the first signal synthesis modulation module, the first channel, and the second signal detection and demodulation module in sequence;

The output frequency signal of the second crystal oscillator module is delivered to the signal acquisition and processing control module and the first mixing phase-locking module through the second signal synthesis modulation module, the second channel, and the first signal detection and demodulation module in sequence;

The signal acquisition and processing control module collects the standard frequency signal and the output signal of the first crystal oscillator module, controls the phase-shifting module to shift the phase of the standard frequency signal, and transmits the frequency signal after the phase-shifting to the first mixing and phase-locking module; A frequency mixing and phase-locking module corrects the output frequency of the first crystal oscillator module, so that the output frequency signal of the second crystal oscillator module locked by the second frequency mixing and phase-locking module is consistent with the frequency phase of the standard frequency signal.

The signal acquisition and processing control module and the phase shifting module are used to shift the phase of the standard frequency, and the phase is controlled by the digital quantity to solve the phase drift problem caused by the analog quantity control adjustment.

In a preferred embodiment, the second crystal oscillator module is connected to the signal acquisition and processing control module, so that the signal acquisition and processing control module can directly obtain the signal output by the second crystal oscillator module to more accurately measure the phase drift of the device, thereby Perform phase correction through the phase-shifting module, pass the phase-corrected signal to the first frequency mixing and phase-locking module, and control the output frequency signal of the first crystal oscillator module through the first mixing and phase-locking module, so that the second signal can be detected and demodulated The phase of the frequency signal received by the module is consistent with the phase of the standard frequency signal.

Furthermore, since the signal mixing and phase-locking module is not sensitive to the second pulse signal with a length of only 100-800 ns, although the second pulse signal will be mixed in the signal demodulated by the signal detection and demodulation module, it will not affect the signal The control of the crystal oscillator module by the frequency mixing and phase-locking module realizes the transmission of second pulses without additional channels, lasers, modulators, etc., which greatly saves resources.

On the other hand, the present invention also provides a dual-channel time-frequency high-precision transmission method of the ring network, which transmits the second pulse signal and the frequency signal through the dual-channel optical fiber between the first optical fiber interface and the second optical fiber interface to realize time-frequency transmission. The high-precision time-frequency signal can be obtained by setting the optical fiber dual-channel time-frequency high-precision transmission intermediate node device at any position on the dual-channel optical fiber.

Further, the frequency signal output by the first crystal oscillator is adjusted by the frequency mixing phase-locked module so that the frequency signal output by the second crystal oscillator is in phase with the standard frequency signal, and the standard frequency signal received by the frequency mixing phase-locked loop is adjusted by the phase shifting module to eliminate The phase drift phenomenon caused by the device.

Specifically, the following steps are included:

S1. The signal acquisition and processing module obtains the standard frequency signal and generates an initial frequency signal; the first second pulse sending and receiving processing module obtains the second pulse signal and generates an initial second pulse signal; the initial frequency signal and the initial second pulse signal are sent out through the first optical fiber interface ;

S2. After receiving the initial frequency signal and the initial second pulse signal at the second optical fiber interface, the second crystal oscillator module and the second second pulse sending and receiving processing module respectively generate a new frequency signal and second pulse signal, and send them out through the second optical fiber interface ;

S3, adjust the frequency signal output by the first crystal oscillator through the frequency mixing and phase locking module, so that the phase of the frequency signal output by the second crystal oscillator is consistent with the phase of the standard frequency signal, adjust the standard frequency signal received by the frequency mixing and phase locking module through the phase shifting module, Furthermore, the frequency signal output by the first crystal oscillator is changed to eliminate the phase drift phenomenon generated by the device.

In the present invention, the frequency signal and the second pulse signal are modulated in the carrier. Specifically, each second is divided into two periods, marked as T ₁ and T ₂ periods. In the T ₁ period, the second pulse signal is sent, and in the T ₂ Period, send frequency signal. Further, in one second, the length of the T ₁ period is 50-500 ns, and the rest of the time is the T ₂ period.

In step S1, the output frequency signal of the first crystal oscillator module is transmitted to the second frequency mixing phase-locking module through the local signal synthesis modulation module, the first channel, and the second signal detection and demodulation module in sequence, and the second frequency mixing phase-locking module The output frequency of the second crystal oscillator module is controlled according to the received frequency signal.

In step S2, the output frequency signal of the second crystal oscillator module is sequentially passed through the second signal synthesis modulation module, the second channel, and the first signal detection and demodulation module to the signal acquisition and processing control module and the first mixing and phase-locking module;

Furthermore, the generation of a new second pulse includes the following process:

S21. Acquire the delay advance amount, and transmit the second pulse signal from the first second pulse sending and receiving processing module to the second second pulse sending and receiving processing module, and then send back the time interval and sending time of the first second pulse sending and receiving processing module Acquisition of delay and receiving delay;

S22. The first second pulse sending and receiving processing module generates a second pulse signal in advance according to the time delay advance, and sends it to the second second pulse sending and receiving processing module, and the second second pulse sending and receiving processing module uses the received second pulse signal as a reference signal ;

S23. Using the zero-crossing point of the frequency signal output by the second crystal oscillator module as the rising edge of the second pulse, generate multiple pulse signals, and select the pulse signal closest to the reference signal from the multiple pulse signals as the second second pulse signal.

In step S3, the signal acquisition processing control module collects the standard frequency signal, the output signal of the first crystal oscillator module, the output signal of the second crystal oscillator module and the signal transmitted by the first signal detection demodulation module, and controls the phase shift after digital measurement The module phase-shifts the standard frequency signal, and transmits the phase-shifted frequency signal to the first mixing phase-locking module; the output frequency of the first crystal oscillator module is corrected by the first mixing phase-locking module, so that the second mixing The output frequency of the second crystal oscillator module locked by the frequency phase locking module is consistent with the frequency phase of the standard frequency signal.

In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "back" etc. are based on the working conditions of the present invention The orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as limiting the present invention . In addition, the terms "first", "second", "first", and "second" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

The present invention has been described in detail above in conjunction with specific implementations and exemplary examples, but these descriptions should not be construed as limiting the present invention. Those skilled in the art understand that without departing from the spirit and scope of the present invention, various equivalent replacements, modifications or improvements can be made to the technical solutions and implementations of the present invention, all of which fall within the scope of the present invention. The protection scope of the present invention shall be determined by the appended claims.

Claims (6)

1. A ring network dual-channel time-frequency high-precision transmission device is characterized in that it comprises a first optical fiber interface and an optical fiber second interface, the first optical fiber interface and the second optical fiber interface are dual-channel optical fiber interfaces, the first optical fiber interface and the second optical fiber interface The second pulse signal and the frequency signal are transmitted through the optical fiber between the second optical fiber interfaces; The dual channel includes a first channel and a second channel, and the signals transmitted by the first channel and the second channel all have a second pulse signal and a frequency signal; It also includes a signal integrated modulation module, a signal detection demodulation module, a second pulse transmission and reception processing module, a crystal oscillator module and a signal acquisition and processing control module. There are two, respectively the first signal synthesis modulation module, the first signal detection demodulation module, the first second pulse transmission receiving processing module, the first crystal oscillator module and the second signal synthesis modulation module, the second signal detection demodulation module, The second second pulse sending and receiving processing module, the second crystal oscillator module; The signal synthesis modulation module is used for signal modulation and transmission, and modulates the second pulse signal and the frequency signal in the carrier wave; The signal detection and demodulation module is used to demodulate the second pulse signal and the frequency signal in the carrier; The first signal integrated modulation module is connected with the first second pulse sending and receiving processing module and the first crystal oscillator module, and the second signal integrated modulation module is connected with the second second pulse sending receiving processing module and the second crystal oscillator module; The first signal detection and demodulation module is connected with the first second pulse sending and receiving processing module and the signal acquisition processing control module, which receives and demodulates the carrier signal transmitted by the second channel of the first optical fiber interface, and demodulates the second pulse The signal is transmitted to the first-second pulse sending and receiving processing module, and the demodulated frequency signal is passed to the signal acquisition and processing control module, and the second signal detection and demodulation module is connected to the second second pulse sending and receiving processing module and the second crystal oscillator module, It receives and demodulates the carrier signal transmitted from the first channel of the second optical fiber interface, transmits the demodulated second pulse signal to the second second pulse sending and receiving processing module, and transmits the demodulated frequency signal to the second crystal oscillator module; The second pulse sending and receiving processing module is used to generate the second pulse signal, the first second pulse sending and receiving processing module can obtain the standard second pulse signal, generate the second pulse signal on the basis of the standard second pulse signal, and the second second pulse sending and receiving processing The module receives the second pulse signal demodulated by the second signal detection and demodulation module as a reference signal for generating the second pulse signal, generates the second second pulse signal, and transmits it to the second signal synthesis modulation module; The crystal oscillator module is used to generate a frequency signal, and the frequency signal generated by the first crystal oscillator module can be transmitted to the first second pulse sending and receiving processing module, the first signal synthesis modulation module and the signal acquisition and processing control module, and the output frequency of the first crystal oscillator module The signal is transmitted to the second frequency mixing and phase-locking module through the first signal synthesis modulation module, the first channel, and the second signal detection and demodulation module in turn; the frequency signal generated by the second crystal oscillator module can be transmitted to the second second pulse sending and receiving processing module , the second signal integrated modulation module and the signal acquisition and processing control module, the output frequency signal of the second crystal oscillator module is transmitted to the signal acquisition and processing control module and the first signal detection demodulation module through the second signal integrated modulation module, the second channel, and the first signal detection demodulation module in turn The first frequency mixing and phase-locking module; the signal acquisition processing control module collects the standard frequency signal and the output signal of the first crystal oscillator module, controls the phase shifting module to shift the phase of the standard frequency signal, and transmits the frequency signal after the phase shifting to the first Mixing phase-locking module; the output frequency of the first crystal oscillator module is corrected by the first mixing phase-locking module, so that the output frequency signal of the second crystal oscillator module locked by the second mixing phase-locking module and the frequency phase of the standard frequency signal consistent; The signal acquisition and processing control module implements indirect control of the phase of the output frequency signal of the crystal oscillator module by adjusting the phase of the output frequency signal of the phase shifting module; The signal acquisition and processing control module compares the frequency signal output by the first crystal oscillator module, the standard frequency signal, the frequency signal output by the second crystal oscillator module, and the frequency signal demodulated by the first signal detection and demodulation module to obtain the frequency signal between the signals. Relative phase, by adjusting the phase of the output frequency signal of the phase shifting module, the phase of the output frequency signal of the first crystal oscillator module is indirectly controlled, so that the phase of the frequency signal output by the second crystal oscillator module is consistent with the phase of the standard frequency signal; Between the signal acquisition and processing control module and the first crystal oscillator module, a first frequency mixing and phase-locking module and a phase shifting module are arranged, and a second frequency mixing and phase-locking module is arranged between the second signal detection and demodulation module and the second crystal oscillator module module; The phase-shifting module receives a standard frequency signal, which is connected to the signal acquisition and processing control module, changes the phase of the standard frequency signal according to the voltage value output by the signal acquisition and processing control module, and generates a phase-shifting frequency signal as the first mixing and phase-locking The input signal of the module, The frequency mixing and phase-locking module is used to adjust the output frequency of the crystal oscillator module, the frequency of the signal generated by the first crystal oscillator module is controlled by the first frequency mixing and phase-locking module, and the signal generated by the second crystal oscillator module is controlled by the second frequency mixing and phase-locking module frequency; the first frequency mixing and phase-locking module is connected with the first signal detection and demodulation module and the phase shifting module, and controls the first crystal oscillator module according to the frequency signal demodulated by the phase shifting frequency and the first signal detection and demodulation module, so that The frequency phase output by the first crystal oscillator module is transmitted to the second signal detection and demodulation module through an optical fiber, and the frequency phase is the same as the standard frequency phase; The output frequency of the crystal oscillator module realizes the effect that the output frequency of the second crystal oscillator module is consistent with the phase of the standard frequency signal; the output frequency of the first crystal oscillator module is adjusted through the first frequency mixing and phase-locking module, and the first mixing and phase-locking module receives The frequency signal output by the second crystal oscillator module and the standard frequency signal delivered by the phase-shift module control the first crystal oscillator module after mixing the two signals, and change the output frequency of the first crystal oscillator module so that the second frequency mixing and phase-locking module receives The frequency signal changes, and then the output frequency of the second crystal oscillator module is changed through the second frequency mixing and phase-locking module, so that the output frequency of the second crystal oscillator module is consistent with the phase of the standard frequency signal. 2. ring network double-channel time-frequency high-precision transmission device according to claim 1, is characterized in that, The signal acquisition and processing control module includes a multi-channel A/D acquisition unit, a calculation unit and a D/A unit, wherein the A/D acquisition unit collects frequency signals, the calculation unit calculates the relative phase between each frequency signal, and the D/A unit The output controls the phase of the sine wave signal. 3. ring network double-channel time-frequency high-precision transmission device according to claim 1, is characterized in that, Between the signal acquisition and processing control module and the first signal detection and mediation module, the first crystal oscillator module, and the second crystal oscillator module, and before collecting standard frequency signals, there is also a down-conversion module. 4. ring network double-channel time-frequency high-precision transmission device according to claim 1, is characterized in that, The first frequency mixing and phase-locking module is connected with the first signal detection module and the phase shifting module, and controls the first crystal oscillator module according to the phase shifting frequency signal and the frequency signal demodulated by the first signal detection module. 5. A ring network dual-channel time-frequency high-precision transmission method, between the first optical fiber interface and the second optical fiber interface, the second pulse signal and frequency signal are transmitted through the dual-channel optical fiber to achieve time-frequency transmission, and any node on the dual-channel optical fiber The high-precision time-frequency signal can be obtained by setting the optical fiber dual-channel time-frequency high-precision transmission intermediate node device, and the optical fiber dual-channel time-frequency high-precision transmission intermediate node device is a dual-channel ring network as described in one of claims 1-4 Time-frequency high-precision transmission device. 6. ring network dual-channel time-frequency high-precision transmission method according to claim 5, is characterized in that, The phase delay drift of the device is obtained through digital measurement, and the phase correction is performed by controlling the phase shifting module, so that the phase of the frequency signal received by the second signal detection and demodulation module is consistent with the phase of the standard frequency signal.

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