Time service safety isolation protection device

Abstract

The utility model relates to the technical field of time service in the electric power or communication industry, in particular to a time service safety isolation protection device. Comprising an interference deception detection module used for receiving satellite signals; the time service algorithm module is used for outputting time service time and time service pulse per second; the local analog signal source is used for outputting analog satellite signals; the taming time keeping module is used for receiving the pulse per second before taming and outputting the pulse per second after taming; the time service module is also electrically connected with a local analog signal source and is used for receiving analog satellite signals generated by the local analog signal source and outputting local time-keeping pulse signals to the time service algorithm module; and the security isolation switching module is used for receiving the judgment result signal, starting isolation and switching, and outputting a switching signal to the time service module and the taming timekeeping module. The problems of isolating interference and deception signals and ensuring continuous, safe and reliable time service signals are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the timing technology field of electric power or communication industry especially relates to a timing safety isolation protection device. BACKGROUND

[0002] With the rapid development of communication and electric power industries, network base stations and end nodes are widely distributed, and a large number of devices rely on single GPS timing receivers to realize frequency synchronization and time synchronization. However, this single timing source-dependent approach has many risks.

[0003] In the prior art, when the GPS system encounters regional degradation, shutdown or is subjected to fraud, the communication and power networks appear to be degraded or even paralyzed on a large scale. In the case of regional shutdown, interference, attack or fraud of satellite navigation signals, terminal devices relying on navigation signals for timing cannot work normally. The existing timing technology cannot monitor abnormal signals in real time and take effective measures in time when facing complex external environmental interference and fraud, resulting in difficulty in guaranteeing the accuracy and stability of timing. Once the GPS signal is interfered or frauded, the traditional timing device cannot quickly switch to a reliable timing source, which easily causes timing interruption or error, and further affects the normal operation of the entire system.

[0004] Therefore, it is of great significance to develop a timing safety isolation protection device to realize real-time monitoring of satellite navigation signals, actively isolate interference and fraud signals, and ensure continuous, safe and reliable timing signals under various complex conditions. UTILITY MODEL CONTENT

[0005] In order to solve the problem of isolating interference and fraud signals and ensuring continuous, safe and reliable timing signals, the utility model provides a timing safety isolation protection device.

[0006] The utility model provides a kind of timing safety isolation protection device, it include:

[0007] Time signal receiving module is used to receive and output satellite signal of satellite;

[0008] Timing module is electrically connected with time signal receiving module, is used to receive satellite signal, output time signal and second pulse signal;

[0009] Interference fraud detection module is electrically connected with time signal receiving module, is used to receive satellite signal, and judge whether there is abnormal signal and output judging result signal;

[0010] Timing algorithm module is electrically connected with timing module, is used to receive time signal and second pulse signal, and output timing time and timing second pulse;

[0011] A local analog signal source is configured to output an analog satellite signal.

[0012] The tame time-keeping module is in bidirectional communication connection with the time algorithm module, configured to receive the pre-taming second pulse and output the post-taming second pulse, and is in electrical connection with the local analog signal source, configured to receive the analog satellite signal generated by the local analog signal source and output the local time-keeping pulse signal to the time algorithm module.

[0013] The safe isolation switching module is in electrical connection with the interference deception detection module, configured to receive the judgment result signal, start isolation and switching, and output the switching signal to the time algorithm module and the tame time-keeping module.

[0014] Further, the time signal receiving module comprises a signal receiving circuit, a power amplifier and a power divider connected in sequence, the power amplifier is configured to amplify the power of the satellite signal, and the power divider is configured to output the satellite signal amplified in power to the time algorithm module and the interference deception detection module.

[0015] Further, the time algorithm module comprises a first level conversion circuit, a first signal isolation circuit and a frequency synthesizing circuit, the input end of the first level conversion circuit is connected with the time algorithm module, the output end of the first level conversion circuit is connected with the input end of the signal receiving circuit and the first signal isolation circuit respectively, one way of the power divider is connected with the input end of the first signal isolation circuit, the output end of the first signal isolation circuit is connected with the input end of the frequency synthesizing circuit, and the output end of the frequency synthesizing circuit is connected with the input end of the time algorithm module.

[0016] Further, the signal receiving circuit comprises a GPS signal receiving circuit and a Beidou satellite signal receiving circuit.

[0017] Further, the tame time-keeping module comprises a second level conversion circuit, a second signal isolation circuit and a tame time-keeping circuit, the signal input end of the second level conversion circuit is connected with the signal output end of the time algorithm module, the output end of the second level conversion circuit is connected with the input end of the tame time-keeping circuit and the second signal isolation circuit respectively, the output end of the time algorithm module is connected with the input end of the tame time-keeping circuit, the output end of the tame time-keeping circuit is connected with the input end of the second signal isolation circuit, and the output end of the second signal isolation circuit is connected with the input end of the time algorithm module.

[0018] Further, the interference deception detection module comprises a band-pass filter and a mixer circuit, an automatic gain control circuit, an analog-to-digital conversion circuit and a digital signal processing circuit connected in sequence, and one way of the power divider is in electrical connection with the input end of the band-pass filter and the mixer circuit.

[0019] Further, the time service algorithm module comprises a microprocessor, a power conversion circuit, an output interface circuit and a third signal isolation circuit, input ends of the microprocessor are electrically connected with output ends of the first signal isolation circuit and the second signal isolation circuit respectively, output ends of the microprocessor are electrically connected with input ends of the time service circuit and the output interface circuit respectively, an output end of the power conversion circuit is connected with the microprocessor, the first level conversion circuit and the second level conversion circuit, an output end of the output interface circuit is electrically connected with an input end of the third signal isolation circuit, and an output end of the third signal isolation circuit outputs authorized time and time service second pulses.

[0020] Further, the safety isolation switching module comprises a fourth signal isolation circuit and an analog switch switching circuit, an input end of the fourth signal isolation circuit is electrically connected with an output end of the digital signal processing circuit, an output end of the fourth signal isolation circuit is electrically connected with an input end of the microprocessor, an output end of the microprocessor is electrically connected with an input end of the analog switch switching circuit, and output ends of the analog switch switching circuit are connected with an input end of the frequency synthesis circuit of the time service module and an input end of the second level conversion circuit of the time service circuit respectively.

[0021] Further, the local analog signal source comprises an oscillation circuit, a signal conditioning circuit, a modulation circuit and a third level conversion circuit connected in sequence, and an output end of the third level conversion circuit is connected with an input end of the second level conversion circuit of the time service circuit.

[0022] Further, the time service algorithm module is connected with an upper computer through an Ethernet.

[0023] In summary, the utility model has the following beneficial technical effects:

[0024] 1. The time service safety isolation protection device has strong anti-interference capability, can monitor satellite signals through the interference deception detection module, can discover abnormal signals in time, and can start isolation and switching with the help of the safety isolation switching module, effectively solves the problems of interference and deception signals, guarantees the accuracy and reliability of time service signals, and can be applied to communication base stations, power systems and the like, and ensures stable and accurate synchronous operation of various systems.

[0025] 2. The time service safety isolation protection device has good time service continuity, is provided with a local analog signal source and a time service circuit, can quickly switch to analog satellite signals generated by the local analog signal source when satellite signals are interfered or abnormal, and can perform time service by using the time service circuit, ensures continuous output of time service time and time service second pulses, and guarantees the continuity of time service, so that time service service is not stopped due to temporary interruption of satellite signals, and the stability of the entire time service system is greatly improved.

[0026] 3. The time signal receiving module of the utility model comprises a GPS signal receiving circuit and a Beidou satellite signal receiving circuit, can be compatible with multiple satellite time service systems, improves the versatility and adaptability of the device, can flexibly select a satellite signal source according to actual use environment and demand, and the time service algorithm module is connected with a host computer through an Ethernet, so that data interaction and remote monitoring management with other equipment or systems are facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a connection schematic diagram of the time service safety isolation protection device of the utility model embodiment.

[0028] Figure 2 It is a principle schematic diagram of the time service of the satellite signal of the utility model embodiment.

[0029] Figure 3 It is a principle schematic diagram of the interference deception domestication time keeping of the utility model embodiment.

[0030] Figure 4 It is a principle schematic diagram of the interference deception detection module of the utility model embodiment.

[0031] Figure 5 It is a principle schematic diagram of the safety isolation switching module of the utility model embodiment.

[0032] Among them, 1, time signal receiving module;101, signal receiving circuit;102, power amplifier;103, power divider;2, time service module;201, first level conversion circuit;202, first signal isolation circuit;203, frequency synthesis circuit;3, interference deception detection module;301, band-pass filter and mixer circuit;302, automatic gain control circuit;303, analog-to-digital conversion circuit;304, digital signal processing circuit;4, time service algorithm module;401, microprocessor;402, power conversion circuit;403, output interface circuit;404, third signal isolation circuit;5, domestication time keeping module;501, second level conversion circuit;502, second signal isolation circuit;503, domestication time keeping circuit;6, local analog signal source;601, oscillation circuit;602, signal conditioning circuit;603, modulation circuit;604, third level conversion circuit;7, safety isolation switching module;701, fourth signal isolation circuit;702, analog switch switching circuit;8, host computer. DETAILED DESCRIPTION

[0033] The utility model will be further explained in detail in combination with the drawings.

[0034] Embodiment 1

[0035] Referring to Figure 1The time service security isolation protection device of the embodiment comprises:

[0036] The time signal receiving module 1 is used for receiving and outputting satellite signals of satellites.

[0037] The time service module 2 is electrically connected with the time signal receiving module 1, is used for receiving satellite signals, and outputs time signals and second pulse signals.

[0038] The interference deception detection module 3 is electrically connected with the time signal receiving module 1, is used for receiving satellite signals, and judges whether there is an abnormal signal and outputs a judgment result signal.

[0039] The time service algorithm module 4 is electrically connected with the time service module 2, is used for receiving time signals and second pulse signals, and outputs time service time and time service second pulses.

[0040] The local analog signal source 6 is used for outputting analog satellite signals.

[0041] The tame time keeping module 5 is bidirectionally connected with the time service algorithm module 4, is used for receiving pre-taming second pulses and outputting post-taming second pulses, and is electrically connected with the local analog signal source 6, is used for receiving analog satellite signals generated by the local analog signal source 6, and outputs local time keeping pulse signals to the time service algorithm module 4.

[0042] The security isolation switching module 7 is electrically connected with the interference deception detection module 3, is used for receiving a judgment result signal, and starts isolation and switching, and outputs a switching signal to the time service module 2 and the tame time keeping module 5.

[0043] Referring to Figure 3 The time signal receiving module 1 comprises a signal receiving circuit 101, a power amplifier 102 and a power divider 103 which are electrically connected in sequence, the power amplifier 102 is used for power amplifying satellite signals, and the power divider 103 is used for outputting power-amplified satellite signals to the time service module 2 and the interference deception detection module 3 respectively.

[0044] The GPS signal receiving circuit 101 adopts a GPS antenna and receives GPS satellite signals conforming to a protocol. The Beidou satellite signal receiving circuit 101 is also provided with a special antenna and receives Beidou satellite signals conforming to a protocol. Both of the two kinds of receiving circuits have good anti-interference ability and can effectively distinguish and extract target satellite signals in a complex electromagnetic environment. The power amplifier 102 linearly amplifies received satellite signals, ensures that the output satellite signal power is stable and meets the processing requirements of subsequent modules. The power divider 103 divides the power-amplified satellite signals into two paths, one of which is transmitted to the time service module 2 to provide a signal basis for normal time service functions, and the other of which is transmitted to the interference deception detection module 3 for real-time monitoring of the quality and safety of satellite signals.

[0045] Referring to Figure 4 , the time service module 2 comprises a first level conversion circuit 201, a first signal isolation circuit 202 and a frequency synthesis circuit 203, the input end of the first level conversion circuit 201 is connected with the time service algorithm module 4, the output end of the first level conversion circuit 201 is connected with the signal receiving circuit 101 and the input end of the first signal isolation circuit 202 respectively, one path of the power divider 103 is connected with the input end of the first signal isolation circuit 202, the output end of the first signal isolation circuit 202 is connected with the input end of the frequency synthesis circuit 203, and the output end of the frequency synthesis circuit 203 is connected with the input end of the time service algorithm module 4.

[0046] The first level conversion circuit 201 mainly plays a role of level adaptation, and converts the signal level output by the time service algorithm module 4 into a level standard matched with the signal receiving circuit 101 and the first signal isolation circuit 202.

[0047] The first signal isolation circuit 202 adopts optical coupling isolation or magnetic coupling isolation technology, effectively isolates the electrical connection between different circuits inside the time service module 2, prevents signal interference and noise from propagating between circuits. At the same time, the first signal isolation circuit 202 can protect the time service module 2 from external abnormal conditions such as high voltage and large current, and improve the stability and reliability of the entire time service module 2. The frequency synthesis circuit 203, based on high-precision crystal oscillator and phase-locked loop technology, can accurately extract and synthesize the frequency information in the received satellite signal, and generate a stable and accurate frequency signal as the reference for time service.

[0048] The signal receiving circuit 101 comprises a GPS signal receiving circuit 101 and a Beidou satellite signal receiving circuit 101.

[0049] Referring to Figure 3 , the tame time-keeping module 5 comprises a second level conversion circuit 501, a second signal isolation circuit 502 and a tame time-keeping circuit 503, the signal input end of the second level conversion circuit 501 is connected with the signal output end of the time service algorithm module 4, the output end of the second level conversion circuit 501 is connected with the input end of the tame time-keeping circuit 503 and the second signal isolation circuit 502 respectively, the output end of the time service algorithm module 4 is connected with the input end of the tame time-keeping circuit 503, the output end of the tame time-keeping circuit 503 is connected with the input end of the second signal isolation circuit 502, and the output end of the second signal isolation circuit 502 is connected with the input end of the time service algorithm module 4.

[0050] The second level conversion circuit 501 converts the control signal and reference signal level output by the time service algorithm module 4 into a level suitable for the time service circuit 503 and the second signal isolation circuit 502 to process, while adjusting the signal input from the local analog signal source 6 or the input source of the tamed satellite model, and building a high-isolation signal isolation barrier through the second signal isolation circuit 502 to prevent external interference signals, such as interference signals from the time service module 2 and the interference deception detection module 3, from entering the time service circuit 503, while avoiding the influence of noise and interference signals generated inside the time service module 5 on the time service algorithm module 4.

[0051] The time service circuit 503 tracks and adjusts the frequency and phase of the input satellite signal or local analog signal. By continuously monitoring the deviation of the input signal from the local clock, using digital control technology such as a PID controller, the parameters of the local clock source are adjusted to gradually synchronize the local clock with the reference signal, and to maintain a stable timekeeping state after synchronization. When the satellite signal is interfered or deceived, the local analog signal source 6 is quickly switched to, and the local clock is continuously adjusted according to the characteristics of the local analog signal to ensure time accuracy in various situations.

[0052] Referring to Figure 4 , the interference deception detection module 3 includes a bandpass filter and mixer circuit 301, an automatic gain control circuit 302, an analog-to-digital conversion circuit 303, and a digital signal processing circuit 304 connected in sequence, and one way of the power divider 103 is electrically connected to the input end of the bandpass filter and mixer circuit 301.

[0053] The bandpass filter can filter out the frequency band where the satellite signal is located, suppress out-of-band noise and interference signals, and improve the signal-to-noise ratio of the signal. The mixer circuit converts the filtered satellite signal into a signal generated by the local oscillator, converts the high-frequency signal into an intermediate-frequency signal, and facilitates subsequent signal processing and analysis.

[0054] The automatic gain control circuit 302 automatically adjusts the gain of the circuit according to the strength of the input signal to ensure that the amplitude of the output signal is stable within a suitable range. This allows the interference deception detection module 3 to adapt to different intensity of satellite signal input, ensures that the subsequent analog-to-digital conversion circuit 303 and digital signal processing circuit 304 can work normally, and avoids signal distortion or detection failure caused by excessively strong or weak signals. The analog-to-digital conversion circuit 303 converts the analog intermediate frequency signal after automatic gain control into a digital signal for further analysis and processing by the digital signal processing circuit 304. The digital signal processing circuit 304 analyzes and judges the received digital satellite signal in real time, detects abnormal changes in parameters such as frequency, phase, and amplitude of the signal, identifies the characteristics of interference signals and deception signals, and outputs corresponding judgment result signals.

[0055] Referring to Figure 2 , the time service algorithm module 4 comprises a microprocessor 401, a power conversion circuit 402, an output interface circuit 403 and a third signal isolation circuit 404, the input end of the microprocessor 401 is electrically connected with the output end of the first signal isolation circuit 202 and the output end of the second signal isolation circuit 502 respectively, the output end of the microprocessor 401 is electrically connected with the input end of the disciplined time keeping circuit 503 and the input end of the output interface circuit 403 respectively, the output end of the power conversion circuit 402 is connected with the microprocessor 401, the first level conversion circuit 201 and the second level conversion circuit 501 respectively, the output end of the output interface circuit 403 is electrically connected with the input end of the third signal isolation circuit 404, and the output end of the third signal isolation circuit 404 outputs the authorized time and the time service second pulse.

[0056] The microprocessor 401 performs calculation and correction on the received time signal and second pulse signal to generate the time service time and the time service second pulse. The power conversion circuit 402 converts the external input power voltage into stable direct current voltage required by each circuit inside the time service algorithm module 4 to provide reliable power supply for the time service algorithm module 4. The output interface circuit 403 provides various standard time service output interfaces such as RS232, RS422, Ethernet and the like, and the third signal isolation circuit 404 uses isolation technology to electrically isolate the output signal of the time service algorithm module 4 from external devices to prevent external interference signals from entering the time service algorithm module 4 through the time service output interface.

[0057] Referring to Figure 5 , the safe isolation switching module 7 comprises a fourth signal isolation circuit 701 and an analog switch switching circuit 702, the input end of the fourth signal isolation circuit 701 is electrically connected with the output end of the digital signal processing circuit 304, the output end of the fourth signal isolation circuit 701 is electrically connected with the input end of the microprocessor 401, the output end of the microprocessor 401 is electrically connected with the input end of the analog switch switching circuit 702, and the output end of the analog switch switching circuit 702 is connected with the input end of the frequency synthesis circuit 203 of the time service module 2 and the input end of the second level conversion circuit 501 of the disciplined time keeping module 5 respectively.

[0058] The fourth signal isolation circuit 701 electrically isolates the judgment result signal output by the interference deception detection module 3 from the microprocessor 401, prevents abnormal signals or noises in the interference deception detection module 3 from affecting the microprocessor 401 of the time service algorithm module 4, and accurately receives and processes the judgment result signal. The analog switch switching circuit 702 switches the signal path according to the control signal of the microprocessor 401. When the interference deception detection module 3 judges that the satellite signal is abnormal, the analog switch switching circuit 702 can switch the signal input end of the time service module 2 to the local analog signal source 6, and at the same time, switch the signal input end of the tamed time keeping module 5 to the local analog signal source 6, so as to realize the isolation of the interference signal and the enablement of the local time keeping function. After the satellite signal returns to normal, the analog switch switching circuit 702 can also timely switch the signal path back to the satellite signal source, so as to ensure that the time service system can normally receive the satellite time service signal.

[0059] With reference to Figure 3 The local analog signal source 6 comprises, which are electrically connected in sequence, an oscillation circuit 601, a signal conditioning circuit 602, a modulation circuit 603 and a third level conversion circuit 604. The output end of the third level conversion circuit is connected with the input end of the second level conversion circuit 501 of the tamed time keeping module 5.

[0060] The oscillation circuit 601 takes a high-precision quartz crystal oscillator as the core to generate a stable and accurate basic oscillation signal. The frequency accuracy thereof can reach ppm level, and has good short-term and long-term frequency stability, thereby providing a reliable frequency reference for subsequent signal conditioning and modulation. The signal conditioning circuit 602 comprises a filter circuit and an amplification circuit. The filter circuit filters the signal output by the oscillation circuit 601 to remove harmonic components, noises and other stray frequency components in the signal. The amplification circuit amplifies the filtered signal according to the requirement of the system on the amplitude of the local analog signal. The modulation circuit 603 modulates the conditioned signal by using digital modulation technology according to the characteristic requirement of the time service system on the analog satellite signal. The direct digital frequency synthesis (DDS) technology is used to realize frequency modulation of the signal. By changing the frequency control word of the DDS, a frequency change similar to the satellite signal characteristics is generated, so that the local analog signal is as close as possible to the real satellite signal in terms of frequency, amplitude and phase, so as to seamlessly replace the satellite signal when the satellite signal is abnormal and maintain the normal operation of the time service system.

[0061] In order to ensure that the local analog signal can match the input level requirement of the tamed time keeping module 5, the third level conversion circuit 604 is adopted to convert the level of the modulated signal to a level range suitable for the processing of the tamed time keeping module 5, so as to ensure that the signal can be correctly recognized and processed when connected to the tamed time keeping module 5, and realize the effective electrical connection and signal transmission between the local analog signal and the tamed time keeping module 5.

[0062] Referring to Figure 2 The time service algorithm module 4 is connected with the upper computer 8 through Ethernet. The upper computer 8 can monitor the running state of the time service security isolation protection device in real time, including the receiving state of the satellite signal, the detection result of the interference and deception, the time service precision and the like. Meanwhile, the upper computer 8 can also remotely configure and manage the time service algorithm module 4, such as updating the receiving frequency and frequency band of the satellite signal, so as to facilitate the user to optimize and maintain the time service system according to the actual demand.

[0063] The working procedure when the satellite signal is normal: the satellite signal received by the GPS and Beidou receiving circuit is amplified by the power amplifier 102, and is divided into two paths by the power divider 103, one path is sent to the time service module 2 to generate the time service signal to the time service algorithm module 4 through the frequency synthesizing circuit 203 after the first level conversion and the first signal isolation, and the other path is sent to the interference and deception detection module 3 to be processed in sequence through the band-pass filter, the mixing, the automatic gain control, the analog-digital conversion and the digital signal processing, and no abnormality is detected. The time service algorithm module 4 microprocessor 401 calculates the correction in combination with the feedback signal of the tamed time keeping module 5, the power conversion circuit 402 supplies power, and the output interface transmits data to the upper computer 8 through the third signal isolation circuit 404. The tamed time keeping module 5 is synchronized and kept time by the tamed time keeping circuit 503 through the second level conversion and the second signal isolation, and outputs the tamed second pulse.

[0064] The working procedure when the satellite signal is subjected to deception or interference: the satellite signal receiving and transmission is initially the same as the normal condition, after the interference and deception detection module 3 detects the abnormality, the judgment result is transmitted to the safety isolation switching module 7 microprocessor 401 through the fourth signal isolation circuit 701, and the analog switch switching circuit 702 is controlled to switch the input end of the time service module 2 and the tamed time keeping module 5 to the local analog signal source 6. The local analog signal source 6 supplies the signal to the tamed time keeping module 5 after oscillation, signal conditioning, modulation and third level conversion, the tamed time keeping module 5 adjusts the local clock time keeping and outputs the local time keeping pulse signal, and the time service module 2 also generates the time service signal based on the local analog signal, the time service algorithm module 4 continues to work and transmits data to the upper computer 8. When the satellite signal recovers to normal, the safety isolation switching module 7 switches the signal source back to the satellite signal, and the system recovers to normal time service.

[0065] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: all equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A time-provisioning secure isolation guard, comprising: The application relates to a time signal receiving module (1) for receiving and outputting satellite signals of satellites; a time-providing module (2) electrically connected with the time signal receiving module (1) and used for receiving the satellite signals, outputting time signals and second pulse signals; an interference deception detection module (3) electrically connected with the time signal receiving module (1) and used for receiving the satellite signals and judging whether abnormal signals exist and outputting a judgment result signal; a time-providing algorithm module (4) electrically connected with the time-providing module (2) and used for receiving the time signals and the second pulse signals and outputting time-providing time and time-providing second pulses; a local analog signal source (6) used for outputting analog satellite signals; a tamed time-keeping module (5) bidirectionally connected with the time-providing algorithm module (4) and used for receiving pre-tamed second pulses and outputting post-tamed second pulses; the tamed time-keeping module (5) is also electrically connected with the local analog signal source (6) and used for receiving the analog satellite signals generated by the local analog signal source (6) and outputting local time-keeping pulse signals to the time-providing algorithm module (4); and a safe isolation switching module (7) electrically connected with the interference deception detection module (3) and used for receiving the judgment result signal, starting isolation and switching and outputting a switching signal to the time-providing module (2) and the tamed time-keeping module (5). The time signal receiving module (1) comprises a signal receiving circuit (101), a power amplifier (102) and a power divider (103) which are electrically connected in sequence, the power amplifier (102) is used for power amplifying the satellite signals, and the power divider (103) is used for outputting the power-amplified satellite signals to the time-providing module (2) and the interference deception detection module (3) respectively. The signal receiving circuit (101) comprises a GPS signal receiving circuit (101) and a Beidou satellite signal receiving circuit (101). The time-providing module (2) comprises a first level conversion circuit (201), a first signal isolation circuit (202) and a frequency synthesizing circuit (203), the input end of the first level conversion circuit (201) is connected with the time-providing algorithm module (4), the output end of the first level conversion circuit (201) is connected with the signal receiving circuit (101) and the input end of the first signal isolation circuit (202) respectively, one way of the power divider (103) is connected with the input end of the first signal isolation circuit (202), the output end of the first signal isolation circuit (202) is connected with the input end of the frequency synthesizing circuit (203), and the output end of the frequency synthesizing circuit (203) is connected with the input end of the time-providing algorithm module (4). ​ ​ ​ ​ 2. The time-provisioning secure-isolation guard of claim 1, wherein, ​ 3. The time-provisioning secure-isolation guard of claim 2, wherein, ​ 4. The time-provisioning secure-isolation guard of claim 2, wherein, ​ 5. The time-provisioning secure-isolation shield according to claim 4, wherein, The taming time-keeping module (5) comprises a second level conversion circuit (501), a second signal isolation circuit (502) and a taming time-keeping circuit (503), the signal input end of the second level conversion circuit (501) is connected with the signal output end of the time service algorithm module (4), the output end of the second level conversion circuit (501) is connected with the input end of the taming time-keeping circuit (503) and the second signal isolation circuit (502) respectively, the output end of the time service algorithm module (4) is connected with the input end of the taming time-keeping circuit (503), the output end of the taming time-keeping circuit (503) is connected with the input end of the second signal isolation circuit (502), and the output end of the second signal isolation circuit (502) is connected with the input end of the time service algorithm module (4).

6. The time-provisioning secure-isolation guard of claim 5, wherein, The interference deception detection module (3) comprises a band-pass filter and a mixer circuit (301), an automatic gain control circuit (302), an analog-to-digital conversion circuit (303) and a digital signal processing circuit (304) connected in sequence, and one way of the power divider (103) is connected with the input end of the band-pass filter and the mixer circuit (301).

7. The time-provisioning secure-isolation guard of claim 6, wherein, The time service algorithm module (4) comprises a microprocessor (401), a power conversion circuit (402), an output interface circuit (403) and a third signal isolation circuit (404), the input end of the microprocessor (401) is connected with the output end of the first signal isolation circuit (202) and the output end of the second signal isolation circuit (502) respectively, the output end of the microprocessor (401) is connected with the input end of the taming time-keeping circuit (503) and the input end of the output interface circuit (403) respectively, the output end of the power conversion circuit (402) is connected with the microprocessor (401), the first level conversion circuit (201) and the second level conversion circuit (501), the output end of the output interface circuit (403) is connected with the input end of the third signal isolation circuit (404), and the output end of the third signal isolation circuit (404) outputs authorized time and time service second pulse.

8. The time-provisioning secure-isolation guard of claim 7, wherein, The safe isolation switching module (7) comprises a fourth signal isolation circuit (701) and an analog switch switching circuit (702), the input end of the fourth signal isolation circuit (701) is connected with the output end of the digital signal processing circuit (304), the output end of the fourth signal isolation circuit (701) is connected with the input end of the microprocessor (401), the output end of the microprocessor (401) is connected with the input end of the analog switch switching circuit (702), and the output end of the analog switch switching circuit (702) is connected with the input end of the frequency synthesis circuit (203) of the time service module (2) and the input end of the second level conversion circuit (501) of the taming time-keeping module (5) respectively.

9. The time-provisioning secure-isolation guard of claim 8, wherein, The local analog signal source (6) comprises an oscillation circuit (601), a signal conditioning circuit (602), a modulation circuit (603) and a third level conversion circuit (604) connected in sequence, and the output end of the third level conversion circuit is connected with the input end of the second level conversion circuit (501) of the disciplined time module (5).

10. The time-provisioning secure-isolation shield according to claim 1, wherein, The time service algorithm module (4) is connected with an upper computer (8) through Ethernet.

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