Green signal shielding device and shielding method for satellite mobile communication system

Abstract

The present invention discloses a green signal blocker and blocking method for a satellite mobile communication system, capable of blocking satellite mobile communication system signals. The blocker comprises the following components: a satellite frequency band transceiver antenna, an analog signal processing unit, a digital signal processing unit, a control unit, and a power supply. The satellite frequency band transceiver antenna is connected to the analog signal processing unit, which is then connected to the digital signal processing unit. The control unit is connected to the analog signal processing unit and the digital signal processing unit, respectively. The power supply supplies power to the other components. The blocker prevents terminals from accessing the satellite mobile communication system network by interfering with the downlink BCCH signal of the satellite mobile communication system, without interfering with the uplink signal and without affecting the satellite. The blocker is suitable for any situation where communication using the satellite mobile communication system needs to be prohibited.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless communications, and in particular to a green signal shielding device and shielding method for a satellite mobile communication system. Background Art

[0002] Satellite mobile communication systems, with their advantages of wide coverage and insensitivity to ground conditions, have become a vital component of terrestrial mobile communications, particularly in areas where terrestrial wireless networks struggle to reach, such as the air, oceans, and deserts. However, while these benefits come with inevitable challenges, they also pose challenges. In some scenarios, shielding terrestrial signals is necessary, and traditional wireless signal jammers are unable to block satellite mobile communication system signals. Furthermore, traditional wireless signal jammers can easily interfere with satellite uplinks, which can have devastating consequences.

[0003] Therefore, there is an urgent need for a shield that can shield satellite mobile communication system signals. Summary of the Invention

[0004] In view of this, the present invention provides a green signal blocker and a blocking method for a satellite mobile communication system, which can block the satellite mobile communication system signal.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is: a green signal blocker for a satellite mobile communication system, characterized in that it includes the following parts: a satellite frequency band transceiver antenna, an analog signal processing unit, a digital signal processing unit, a control unit and a power supply.

[0006] The satellite frequency band transceiver antenna is connected to the analog signal processing unit, the analog signal processing unit is connected to the digital signal processing unit, the control unit is connected to the analog signal processing unit and the digital signal processing unit respectively, and the power supply provides power to other parts.

[0007] Furthermore, after the shield is powered on, the satellite signal received by the satellite frequency band transceiver antenna is sent to the analog signal processing unit, and the analog signal processing unit amplifies, down-converts, filters and performs analog-to-digital conversion on the signal, and the obtained digital baseband signal is sent to the digital signal processing unit;

[0008] After the digital signal processing unit demodulates the digital baseband signal transmitted from the analog signal processing unit, it obtains downlink synchronization and tracks the synchronized signal. The sending part generates an interference sequence, which is filtered and then up-converted by the analog signal processing unit. The interference signal is sent out through the satellite frequency band transceiver antenna according to the current downlink frequency of the satellite mobile communication system.

[0009] The control unit is responsible for parameter configuration, time synchronization, automatic frequency control, automatic gain control, and transmit power control functions.

[0010] Another embodiment of the present invention further provides a green signal blocker shielding method for a satellite mobile communication system, which uses the green signal blocker to perform the following steps:

[0011] Step 1: Search for the frequency correction channel FCCH;

[0012] Step 2: After searching for the FCCH signal, track the FCCH signal at a fixed time according to the downlink frame structure to correct the frequency deviation and delay caused by satellite drift and terminal movement;

[0013] Step 3: Generate a comb-shaped single-frequency sequence as an interference sequence according to the downlink bandwidth of the satellite mobile communication system. The single-frequency sequence is a comb-shaped single-frequency sequence in the frequency domain and is the same as the BCCH channel occupied time slot in the time domain.

[0014] After the interference sequence is generated in step ④, the data is upsampled and filtered, and the bandwidth of the interference sequence and the BCCH signal are kept consistent to obtain the IQ data after the filtering process.

[0015] Step 5: After the shaping filter processing, the IQ data is sent to the analog signal processing unit according to the time slot of the BCCH channel. The analog signal processing unit performs up-conversion and sends the interference signal through the satellite frequency band transceiver antenna according to the current downlink frequency of the satellite mobile communication system.

[0016] Furthermore, step ① FCCH searches for a frequency correction channel, specifically: performing downlink broadcast channel frequency synchronization and frame synchronization through FCCH search.

[0017] Furthermore, in step ②, the downlink frame structure is the downlink frame structure specified by the GMR protocol.

[0018] Beneficial effects:

[0019] The present invention provides a green signal blocker for a satellite mobile communication system, which can block satellite mobile communication system signals. The interference signal emitted by the green signal blocker only occupies a small amount of time and frequency resources, which can greatly reduce the power of the blocker and is environmentally friendly and efficient.

[0020] The present invention provides a method for blocking green signal jammers in satellite mobile communication systems. This method interferes with the downlink BCCH signal of the satellite mobile communication system, preventing terminals from accessing the satellite mobile communication network without interfering with uplink signals or affecting satellites. The method is suitable for any situation where communication using the satellite mobile communication system needs to be prohibited. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A structural block diagram of a green signal blocker for a satellite mobile communication system provided by an embodiment of the present invention;

[0022] Figure 2 A flowchart of a green signal blocker shielding method for a satellite mobile communication system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0024] 1. Jammer

[0025] 1. Overall

[0026] like Figure 1 The shield includes a satellite frequency band transceiver antenna 10, a signal processing module 20 and a power supply 30; the signal processing unit includes a digital signal processing unit 22, an analog signal processing unit 21 and a control unit 23 that interact with each other;

[0027] The satellite frequency band transceiver antenna 10 is connected to the signal processing module 20 , and the power supply 30 is connected to the signal processing module 20 .

[0028] Working principle:

[0029] After the shield is powered on, the satellite signal received by the satellite frequency band transceiver antenna 10 is sent to the analog signal processing unit 21, which amplifies, down-converts, filters and performs analog-to-digital conversion on the signal, and the obtained digital baseband signal is sent to the digital signal processing unit 22;

[0030] After demodulating the digital baseband signal transmitted from the analog signal processing unit 21, the digital signal processing unit 22 obtains downlink synchronization and tracks the synchronized signal. The sending part generates an interference sequence, which is filtered and then up-converted by the analog signal processing unit 21. The interference signal is sent out through the satellite frequency band transceiver antenna according to the current downlink frequency of the satellite mobile communication system.

[0031] The control unit 23 is responsible for parameter configuration, time synchronization, automatic frequency control, automatic gain control, and transmit power control functions.

[0032] 2. Functional components

[0033] 1) Satellite frequency band transceiver antenna 10

[0034] The satellite band transceiver antenna 10 is used to receive and transmit radio frequency signals.

[0035] 2) Signal processor 20

[0036] The signal processor 20 includes an analog signal processing unit 21 , a digital signal processing unit 22 , and a control unit 23 , which interact with each other.

[0037] (1) Analog signal processing unit 21

[0038] The working process is as follows: on the one hand, the satellite signal received by the satellite frequency band transceiver antenna 10 is amplified, down-converted, filtered and analog-to-digital converted, and the obtained digital baseband signal is sent to the digital signal processing unit 22; on the other hand, the baseband signal processed by the digital signal processing unit 22 is subjected to digital-to-analog conversion, frequency conversion and amplification, and the interference signal is sent to the air through the satellite frequency band transceiver antenna 10;

[0039] (2) Digital signal processing unit 22

[0040] The working process is: on the one hand, after demodulating the digital baseband signal transmitted from the analog signal processing unit 21, downlink synchronization is obtained and the synchronized signal is tracked and synchronized; on the other hand, an interference sequence is generated, which is sent to the analog signal processing unit 21 after shaping filtering and baseband signal processing.

[0041] (3) Control unit 23

[0042] The control unit is responsible for parameter configuration, time synchronization, automatic frequency control, automatic gain control, and transmit power control functions.

[0043] 3) Power supply 30

[0044] The power supply 30 is responsible for supplying power to all modules.

[0045] 2. Methods

[0046] like Figure 2 , this method comprises the following steps:

[0047] Start - 200

[0048] Step ①FCCH search-201

[0049] Acquire downlink broadcast channel frequency synchronization and frame synchronization through FCCH search;

[0050] Step ② Tracking synchronization-202

[0051] After searching for the FCCH signal, it tracks the FCCH signal at a fixed time according to the downlink frame structure to correct the frequency deviation and delay caused by satellite drift and terminal movement;

[0052] Step 3: Generate BCCH interference sequence-203

[0053] A comb-shaped single-frequency sequence is generated as an interference sequence according to the downlink bandwidth of the satellite mobile communication system. The single-frequency sequence is a comb-shaped single-frequency in the frequency domain and is the same as the time slot occupied by the BCCH channel in the time domain.

[0054] Step 4: The interference sequence is upsampled and filtered-204

[0055] After the interference sequence is generated, the data is up-sampled and filtered, and the bandwidth of the interference sequence and the BCCH signal are kept consistent.

[0056] Step 5: Send baseband signal - 205

[0057] The IQ data after baseband signal processing is sent to the analog signal processing unit according to the time slot of the BCCH channel. The analog signal processing unit performs up-conversion and sends the interference signal through the satellite frequency band transceiver antenna according to the current downlink frequency of the satellite mobile communication system.

[0058] Step ⑥ ends - 206

[0059] The comb-shaped single frequency sequence in step ③ is as follows:

[0060]

[0061]

[0062] Where: [f1,f2,…f 15 ,f 16 ] = [1000, 2000, ... 15000, 16000]

[0063] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A green signal jammer shielding method for a satellite mobile communication system, characterized in that: Perform the following steps: Step 1: Search for the frequency correction channel FCCH; Step 2: After searching for the FCCH signal, track the FCCH signal at a fixed time according to the downlink frame structure to correct the frequency deviation and delay caused by satellite drift and terminal movement; Step 3: Generate a comb-shaped single-frequency sequence as an interference sequence according to the downlink bandwidth of the satellite mobile communication system. The single-frequency sequence is a comb-shaped single-frequency sequence in the frequency domain and is the same as the BCCH channel occupied time slot in the time domain. After the interference sequence is generated in step ④, the data is upsampled and filtered, and the bandwidth of the interference sequence and the BCCH signal are kept consistent to obtain the IQ data after the filtering process. Step 5: After the shaping filter processing, the IQ data is sent to the analog signal processing unit according to the time slot of the BCCH channel. The analog signal processing unit performs up-conversion and sends the interference signal through the satellite frequency band transceiver antenna according to the current downlink frequency of the satellite mobile communication system.

2. The green signal blocker shielding method of a satellite mobile communication system according to claim 1, characterized in that: The step ① FCCH searches for a frequency correction channel, specifically: performing downlink broadcast channel frequency synchronization and frame synchronization through FCCH search.

3. The green signal blocker shielding method of a satellite mobile communication system according to claim 1, characterized in that: In step ②, the downlink frame structure is the downlink frame structure specified by the GMR protocol.

4. A green signal blocker shielding method for a satellite mobile communication system according to any one of claims 1 to 3, characterized in that: The actuator of steps ①-⑤ is a green signal blocker for a satellite mobile communication system, comprising the following parts: a satellite frequency band transceiver antenna, an analog signal processing unit, a digital signal processing unit, a control unit, and a power supply; The satellite frequency band transceiver antenna is connected to the analog signal processing unit, the analog signal processing unit is connected to the digital signal processing unit, the control unit is connected to the analog signal processing unit and the digital signal processing unit respectively, and the power supply provides power to other parts.

5. The green signal jammer shielding method of a satellite mobile communication system according to claim 4, characterized in that: After the shield is powered on, the satellite signal received by the satellite frequency band transceiver antenna is sent to the analog signal processing unit, and the analog signal processing unit amplifies, down-converts, filters and performs analog-to-digital conversion on the signal, and the obtained digital baseband signal is sent to the digital signal processing unit; The digital signal processing unit demodulates the digital baseband signal transmitted from the analog signal processing unit, obtains downlink synchronization and tracks the synchronized signal. The transmitting part generates an interference sequence, which is filtered and then up-converted by the analog signal processing unit. The interference signal is then transmitted through the satellite frequency band transceiver antenna according to the current downlink frequency of the satellite mobile communication system. The control unit is responsible for parameter configuration, time synchronization, automatic frequency control, automatic gain control, and transmit power control functions.

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