Beidou satellite short message terminal

Abstract

The invention discloses a Beidou satellite short message terminal, which comprises a Beidou short message communication circuit, a TYPE-C interface circuit and a power supply circuit, and is characterized in that the Beidou short message communication circuit is electrically connected with the TYPE-C interface circuit, the TYPE-C interface circuit and the power supply circuit are both electrically connected with a first TYPE-C interface, and the power supply circuit is also electrically connected with a second TYPE-C interface; the first TYPE-C interface is used for being connected with an intelligent terminal, and the second TYPE-C interface is used for being connected with a power adapter. By means of the first TYPE-C interface, the Beidou satellite short message terminal and the intelligent terminal are used in a plug-in mode, the two-way communication function of Beidou satellite short messages is achieved, cost is low, and convenience and rapidness are achieved.

Description

Technical Field

[0001] The present invention relates to the application field of Beidou terminals, and in particular to a Beidou satellite short message terminal. Background Art

[0002] The BeiDou-2 satellite navigation system is a global satellite navigation system independently developed by China. The BeiDou-3 project was officially launched in 2009. The space segment of the BeiDou-3 satellite navigation system consists of 27 medium earth orbit satellites, 5 synchronous orbit satellites, and 3 inclined synchronous orbit satellites, which will provide services to the world. BeiDou-3 officially provided services to the world on July 31, 2020. BeiDou-3 mainly provides basic navigation services, short message communication services (regional, global), satellite-based augmentation services, international search and rescue services, precise point positioning services and other major services. The short message service capability of BeiDou-3 is 10 times larger in capacity than BeiDou-2, and the transmission power is 10 times smaller than BeiDou-2, which makes BeiDou short messages have stronger communication service capabilities.

[0003] The terminals involved in Beidou satellite short message communication mainly include handheld, vehicle-mounted, ship-mounted, data transmission, command machine and other series. Handheld Beidou satellite short message terminals are the most widely used. At present, handheld terminals based on Beidou satellite short messages all integrate the antenna and module of Beidou satellite short messages inside the handheld terminal, which leads to high terminal cost and limited promotion of Beidou satellite short message handheld terminals. Summary of the invention

[0004] (I) Purpose of the invention

[0005] The purpose of the present invention is to provide a Beidou satellite short message terminal, which can realize the Beidou satellite short message communication function by plugging it into a smart phone on the market through a TYPE-C interface and then turning the mobile phone upside down with the antenna facing the sky. The terminal has low manufacturing cost, wide application range, plug-and-play, and is convenient and quick.

[0006] (II) Technical solution

[0007] To solve the above problems, the present invention provides a Beidou satellite short message terminal, which includes a Beidou short message communication circuit, a TYPE-C interface circuit and a power supply circuit, wherein the Beidou short message communication circuit is electrically connected to the TYPE-C interface circuit, the TYPE-C interface circuit and the power supply circuit are both electrically connected to a first TYPE-C interface, and the power supply circuit is also electrically connected to a second TYPE-C interface;

[0008] The first TYPE-C interface is used to connect to a smart terminal, and the second TYPE-C interface is used to connect to a power adapter.

[0009] Furthermore, the Beidou short message communication circuit includes an S-frequency passive antenna, an L-frequency passive antenna, an S-frequency low-noise amplifier circuit, an L-frequency power amplifier circuit, an RDSS channel up and down frequency conversion circuit, a Beidou short message baseband circuit and a Beidou SIM card circuit. The S-frequency passive antenna is electrically connected to the RDSS channel up and down frequency conversion circuit through the S-frequency low-noise amplifier circuit, the L-frequency passive antenna is electrically connected to the RDSS channel up and down frequency conversion circuit through the L-frequency power amplifier circuit, and the RDSS channel up and down frequency conversion circuit, the Beidou SIM card circuit and the TYPE-C interface circuit are all electrically connected to the Beidou short message baseband circuit.

[0010] Furthermore, the S-frequency passive antenna supports an elevation angle of 20-90 degrees and an azimuth angle of 0-360 degrees.

[0011] Furthermore, the L-frequency passive antenna supports an elevation angle of 20-90 degrees and an azimuth angle of 0-360 degrees.

[0012] Furthermore, the power supply circuit includes a first power supply part and a second power supply part, the first power supply part is electrically connected to the first TYPE-C interface, and the second power supply part is electrically connected to the second TYPE-C interface.

[0013] Furthermore, the first power supply part includes a first outbound signal circuit branch and a first inbound signal circuit branch, the first outbound signal circuit is used to power the S-frequency passive antenna, the L-frequency passive antenna, the S-frequency low-noise amplifier circuit, the L-frequency power amplifier circuit, the RDSS channel up and down conversion circuit, the Beidou short message baseband circuit and the Beidou SIM card circuit; the first inbound signal circuit branch is powered by a supercapacitor.

[0014] Furthermore, the second power supply part includes a second outbound signal circuit branch, a second inbound signal circuit branch and a smart terminal charging branch, the second outbound signal circuit is used to power the S-frequency passive antenna, the L-frequency passive antenna, the S-frequency low noise amplifier circuit, the L-frequency power amplifier circuit and the RDSS channel up and down conversion circuit, the Beidou short message baseband circuit and the Beidou SIM card circuit; the second inbound signal circuit branch is powered by a DC-DC converter, and the smart terminal charging branch powers the smart terminal through the first TYPE-C interface.

[0015] Furthermore, the voltage output by the first power supply part is 5V, and the current output is generally 500mA-1000mA.

[0016] Furthermore, it is characterized in that the intelligent terminal is a mobile phone.

[0017] Furthermore, the mobile phone is installed with a Beidou satellite short message APP, which has at least Beidou satellite short message signal strength display, Beidou short message user card basic information display, Beidou short message message reception and transmission and SOS alarm function.

[0018] (III) Beneficial effects

[0019] The Beidou satellite short message terminal provided by the present invention has the following beneficial technical effects: the terminal includes a Beidou short message communication circuit, a TYPE-C interface circuit and a power supply circuit, the Beidou short message communication circuit is electrically connected to the TYPE-C interface circuit, the first TYPE-C interface is used to connect to the intelligent terminal, and when in use, the first TYPEC interface and the intelligent terminal are plugged in, and then the intelligent terminal is inverted to keep the Beidou satellite short message antenna facing the sky, so as to realize the two-way communication function of the Beidou satellite short message. In addition, the TYPE-C interface circuit and the power supply circuit are both electrically connected to the first TYPE-C interface, and the power supply circuit is also electrically connected to the second TYPE-C interface, and the second TYPE-C interface is used to connect to the power adapter. The second TYPE-C interface is a charging interface, and the design purpose is: when the mobile phone is low on power, the mobile phone and the Beidou satellite short message function cannot be used. The Beidou satellite short message terminal supports charging through the second TYPE-C interface. When the external power adapter is inserted into the second TYPE-C interface of the Beidou satellite short message terminal, the Beidou satellite short message terminal is independently powered, and the mobile phone is also charged. The Beidou satellite short message terminal has a simple circuit design, a small terminal size, a light weight, low power consumption, plug-and-play, and is easy to use. The cost is greatly advantageous over the traditional Beidou short message integrated handheld device. The Beidou satellite short message terminal of the present invention provides great possibilities for the popularization and application of Beidou satellite short messages in all walks of life, with low cost and convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the use of the Beidou satellite short message terminal of the present invention;

[0021] Figure 2 It is a Beidou satellite short message terminal structure block diagram of the present invention;

[0022] Figure 3 Schematic diagram of a TYPE-C interface circuit (USB-serial port circuit) according to a specific embodiment of the present invention;

[0023] Figure 4 It is a schematic diagram of a power block diagram of a first power supply part (mobile phone power supply) of a specific embodiment of the present invention;

[0024] Figure 5 It is a schematic diagram of a power block diagram of a second power supply part (powered by an external power supply) of a specific embodiment of the present invention;

[0025] Figure 6 It is a block diagram of the Beidou satellite short message mobile phone APP according to a specific embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0027] like Figure 1 As shown, the present invention provides a Beidou satellite short message terminal, which realizes the two-way communication function of Beidou satellite short messages by plugging with the TYPEC interface of an intelligent terminal, and the intelligent terminal is, for example, a mobile phone. Figure 2 As shown in the figure, the Beidou satellite short message terminal includes Beidou short message communication circuit, TYPE-C interface circuit and power supply circuit. The connection and corresponding functions of each part are as follows:

[0028] Beidou short message communication circuit: Beidou short message communication circuit includes S-frequency passive antenna, L-frequency passive antenna, S-frequency low noise amplifier circuit, L-frequency power amplifier circuit, RDSS channel up and down frequency conversion circuit, Beidou short message baseband circuit and Beidou SIM card circuit. The S-frequency passive antenna is electrically connected to the RDSS channel up and down frequency conversion circuit through the S-frequency low noise amplifier circuit. The S-frequency passive antenna is used to receive the Beidou short message satellite outbound signal, with a center frequency of 2491.75MHz. The S-frequency passive antenna supports an elevation angle of 20°~90° and an azimuth angle of 0°~360°. It adopts an omnidirectional antenna design, which is convenient for users to quickly (less than 1 second) lock the Beidou satellite short message outbound signal, ensuring the convenience and reliability of users. The S-frequency low-noise amplifier circuit is used to perform low-noise amplification on the weak signal received by the S-frequency passive antenna. Considering the cost, anti-interference and power consumption, a two-stage amplifier design is adopted, and the low-noise amplifier gain is designed to be about 32dB (±1dB). The L-frequency passive antenna is electrically connected to the RDSS channel up and down conversion circuit through the L-frequency power amplifier circuit. The L-frequency passive antenna is used to transmit the Beidou short message satellite inbound signal. The Beidou-3 civil short message inbound frequency supports two inbound frequencies, namely Lf1 and Lf2, and the intermediate frequencies are 1614.26MHz and 1618.34MHz respectively. The L-frequency passive antenna supports an elevation angle of 20° to 90° and an azimuth angle of 0° to 360°. It adopts an omnidirectional antenna design to ensure the power of the inbound signal and the success rate of communication. The L-frequency power amplifier circuit (L-frequency amplifier) ​​adopts a 5-watt amplifier design, which is used to amplify the incoming telegram information signal and then transmit it to the Beidou short message satellite. During use, when the signal is normal, it is attenuated to 2 watts by default, which reduces the power supply requirements for the mobile phone and increases the battery life of the mobile phone. When the signal is weak, such as in the forest or in bad weather, it can be set to 5 watts for inbound power application. The RDSS channel up-down conversion circuit is used to down-convert the S-frequency RF signal 2491MHz to an intermediate frequency signal. The intermediate frequency of the intermediate frequency signal is 12.24MHz, which is used by the AD (circuit that converts analog signals to digital signals) of the Beidou short message baseband circuit. The RDSS channel up-down conversion circuit is used to BPSK modulate the inbound telegram output by the Beidou short message baseband circuit and up-convert it to the L-band inbound frequency, specifically mixing the 8.16MBPSK signal output by the baseband and modulating it to the L-band.

[0029] The RDSS channel up and down frequency conversion circuit, Beidou SIM card circuit and TYPE-C interface circuit are all electrically connected to the Beidou short message baseband circuit. Among them, the Beidou short message baseband circuit is the core circuit of the Beidou satellite short message terminal, which is used to realize the capture, tracking, telegram analysis and modulation of the Beidou satellite short message outbound signal, and belongs to the digital circuit part. The Beidou short message baseband circuit has a built-in AD sampling, which is used to realize the capture, tracking, demodulation, telegram analysis and modulation of the Beidou short message outbound signal. The Beidou SIM card circuit is connected to the Beidou short message baseband circuit to realize the communication of the Beidou dedicated user SIM card. Before using the Beidou satellite short message terminal, the Beidou short message SIM card must be placed in the terminal in advance. The Beidou short message baseband circuit receives the Beidou short message and needs to send it to the Beidou SIM card for descrambling, which becomes a usable plaintext message and is transferred to the user through the serial port. The Beidou satellite short message terminal sends a Beidou short message to the Beidou satellite to apply for entry. It must first request an identity authentication code from the Beidou SIM card before it can apply for entry to the Tianchao Beidou satellite.

[0030] like Figure 2 As shown, the Beidou short message baseband circuit provides Beidou short message communication service functions through the serial port. The serial port interface provided by the Beidou short message baseband circuit converts the serial port of the Beidou short message baseband circuit into a USB interface through the USB / serial port conversion chip circuit, and connects and communicates interactively with the USB OTG interface of the mobile phone. The TYPEC interface circuit is connected to the mobile phone through the mobile phone TYPEC interface (the first TYPE-C interface), and the mobile phone performs two-way data communication with the Beidou short message terminal. The TYPE-C interface circuit is as shown in FIG. Figure 3 As shown in the figure, the principle is: the serial port of the Beidou baseband and the USB interface of the mobile phone are used to realize two-way communication function through the USB / serial port conversion chip. Figure 3 The meaning of each character is as follows: VCC: power input, default is 5V; GND: power ground, digital ground; RX: serial port receive; TX: serial port transmit; UD+: USB data differential line positive; UD-: USB data differential line negative; The definitions of 1-4 in USB are as follows: 1: VCC-power input, default is 5V; 2: D+, USB data differential line positive; 3: D-, USB data differential line negative; 4: GND, power ground, digital ground.

[0031] Power supply circuit: The power supply circuit includes a first power supply part (powered by the mobile phone) and a second power supply part (powered by an external power supply), and the first power supply part and the second power supply part are both arranged inside the power supply circuit. Figure 4 and Figure 5 The power supply principle of each power supply part is described as follows:

[0032] 1. The first power supply part (mobile phone power supply)

[0033] The mobile phone supplies power to the Beidou short message terminal through the first TYPE-C interface (mobile phone TYPEC interface), such as Figure 4 As shown, the voltage output by the mobile phone power supply is 5V, and the output current is generally 500mA~1000mA. The current output capacity varies according to different mobile phone models. The mobile phone power supply includes the first outbound signal circuit branch and the first inbound signal circuit branch. The first outbound signal circuit branch is a long-term power supply, which is used to power the circuit for receiving Beidou satellite short messages, that is, to power the outbound signal. Figure 4 The middle upper branch is the first outbound signal circuit branch. The input 5V is output to 3.7V through a DC-DC power conversion chip, and then through two LDO power chips, two 3.3V are output to power the RF circuit and digital circuit respectively. The RF circuit includes the S-frequency passive antenna, the L-frequency passive antenna, the S-frequency low-noise amplifier circuit, the L-frequency power amplifier circuit and the RDSS channel up and down conversion circuit; the digital circuit includes the Beidou short message baseband circuit and the Beidou SIM card circuit;

[0034] The next branch is the first inbound signal circuit branch. The first inbound signal circuit branch is a burst power supply, which is used to power the transmission of Beidou satellite short messages, that is, to power the inbound signal. The inbound signal circuit is a burst power supply, and the duration is 100ms to 1000ms according to the length of the message to be sent. The frequency of Beidou satellite short message transmission is generally transmitted once every 60s for civilian users. Considering the power output capacity of the TYPEC interface of the mobile phone and the characteristics of the Beidou short message inbound signal transmission, a super capacitor design is added to the inbound power supply. The super capacitor is charged during the normal standby process. When sending Beidou short messages, that is, when applying for inbound, the power amplifier is turned on and the power supply of the power amplifier is supplemented by the super capacitor to ensure the reliability of the Beidou satellite short message inbound power supply.

[0035] 2. Second power supply part (external power supply)

[0036] After the Beidou satellite short message terminal is inserted into the mobile phone, the mobile phone will no longer be able to charge through the mobile phone TYPEC interface. When the mobile phone battery is low, the mobile phone and Beidou satellite short message function will not be able to be used. Figure 5 As shown, the Beidou satellite short message terminal supports another external power supply.

[0037] The external power supply includes a second outbound signal circuit branch, a second inbound signal circuit branch and a smart terminal charging branch, wherein the smart terminal charging branch is, for example, a mobile phone charging branch. Figure 5The middle top-level branch is the second outbound signal circuit branch. The power supply principle of the second outbound signal circuit branch is the same as that of the first outbound signal circuit branch powered by the above-mentioned mobile phone. The second outbound signal circuit branch is a long-term power supply (power supply for outbound signals) and is used to power the circuit for receiving Beidou satellite short messages. The voltage input by the external power adapter ranges from 5V to 12V, which is converted into 3.7V through a DC-DC step-down circuit, and then converted into 3.3V through two LDO circuits to power the RF circuit and digital circuit of the Beidou satellite short message terminal respectively. Figure 5 In the figure, the middle branch is the second inbound signal circuit branch. The second inbound signal circuit branch has the same function as the first inbound signal circuit branch of the mobile phone power supply. It is a burst power supply used to power the transmission of Beidou satellite short messages, that is, to power the inbound signal. The voltage input by the external power adapter is output through the DC-DC step-down circuit to supply 5V power to the power amplifier. The power amplifier power supply is a burst power supply, and the power amplifier is powered only when the power amplifier is enabled to high. Figure 5 In the figure, the bottom branch is the mobile phone charging branch. The voltage input by the external power adapter will also be directly connected to the TYPEC interface of the mobile phone to charge the mobile phone. The second power supply part is electrically connected to the second TYPE-C interface (charging TYPEC interface), and the charging TYPEC interface is also connected to the power adapter. When the external power adapter is inserted into the charging TYPEC interface of the Beidou satellite short message terminal, it can independently power the Beidou satellite short message terminal and charge the mobile phone at the same time.

[0038] like Figure 6 As shown, after the Beidou satellite short message terminal is inserted into the mobile phone through the mobile phone TYPEC interface, the mobile phone communicates with the Beidou satellite short message terminal based on the OTG-USB serial port. The APP development functions on the mobile phone include Beidou satellite short message signal strength display, Beidou short message user card basic information display, Beidou short message message reception and sending, and SOS alarm and other functions.

[0039] The TYPE-C interface of a mobile phone is usually located at the bottom of the phone. When the Beidou satellite short message terminal is inserted, the phone will be used upside down, and the satellite antenna of the Beidou satellite short message terminal will face upwards, toward the sky. At this time, the Beidou satellite short message APP interface will automatically rotate to ensure normal use of the APP interface.

[0040] In practical applications, the Beidou satellite short message terminal encodes data when sending data to the Beidou satellite, and decodes the data when receiving data sent by the Beidou satellite. In one possible scenario, the above data encoding process is as follows:

[0041] A. Steps of encoding model:

[0042] 1. Input the original short message M, where M is the original short message;

[0043] 2. Preprocessing: Convert M into a binary sequence B, and perform bit filling, scrambling and nonlinear transformation to obtain B', where B is the binary representation of the original short message and B' is the binary sequence after bit filling, scrambling and nonlinear transformation;

[0044] 3. Polynomial Chaotic Transformation:

[0045]

[0046] In formula (1), P(x) is the intermediate representation obtained by polynomial chaotic transformation, b i ′ is the i-th position in B', a i is a chaotic sequence associated with i, p is a large prime number used for polynomial transformation, and n is the length of B'.

[0047] 4. Deep Chaos Mapping:

[0048] C i =DeepChaoticMap(P(x i ),θ); (2)

[0049] In formula (2), C i is the data point after deep chaos mapping, DeepChaoticMap is the deep chaos mapping function, and θ is the parameter set of the deep chaos mapping function, which is used to further disrupt the data and increase security.

[0050] 5. Attention Mechanism Encoding:

[0051] C=AttentionEncoder({C i},φ); (3)

[0052] In formula (3), AttentionEncoder is an encoder based on the attention mechanism, φ is the parameter set of the encoder, which is used to learn the long-distance dependencies in the data and output the final encoded short message.

[0053] 6. Output the encoded short message C, where C is the encoded short message.

[0054] The above process of decoding the data is as follows:

[0055] B. Steps for decoding the model:

[0056] 1. Input: received coded short message C;

[0057] 2. Attention mechanism decoding:

[0058] {C i ′}=AttentionDecoder(C,φ′); (4)

[0059] In formula (4), {C i ′} is the data point in the decoding process, AttentionDecoder is a decoder based on the attention mechanism, φ′ is the parameter set of the decoder, which is used to learn the long-distance dependencies in the data and output the decoded data points.

[0060] 3. Deep Chaos Mapping Inverse Transformation:

[0061] P′(x i )=DeepChaoticMap -1 (C i ′,θ′); (5)

[0062] In formula (5), P′(x i ) is the polynomial representation in the decoding process; B″ is the decoded binary sequence, θ′ is the parameter set of the inverse transformation, and B″ can also be further processed according to actual needs.

[0063] 4. Inverse polynomial transform:

[0064] B″=InversePolynomialTransform({P′(x i )},{a i},p); (6)

[0065] In formula (6), this step is to convert the polynomial P′(x) back to the binary sequence B″, where the original chaotic sequence a is needed. i and a large prime number p.

[0066] 5. Post-processing: perform bit de-stuffing, de-scrambling and non-linear inverse transformation on B″ to convert it into a text message M';

[0067] 6. Output the decoded original short message M', where M' is the decoded original short message.

[0068] The Beidou satellite short message terminal provided by the present invention uses the unique creativity of the mobile phone TYPEC interface to plug the Beidou satellite short message terminal and the mobile phone for use, thereby realizing the two-way communication function of the Beidou satellite short message. After the Beidou satellite short message terminal is inserted into the mobile phone through the mobile phone TYPEC interface, the Beidou satellite short message terminal can also be powered through the mobile phone TYPEC interface. When the mobile phone is low on power, the charging TYPEC interface of the Beidou satellite short message terminal is connected to the power adapter. At this time, the power supply of the Beidou satellite short message terminal is supplied by an external power adapter, and the power adapter will also charge the mobile phone. The circuit design of the Beidou satellite short message terminal is simple, the terminal is small in size, light in weight, low in power consumption, plug-and-play, easy to use, and has great cost advantages over traditional Beidou short message handheld devices. It provides great possibilities for the popularization and application of Beidou satellite short message communication in all walks of life, and has great economic benefits and social value.

Claims

1. A Beidou satellite short message terminal, characterized in that: The Beidou satellite short message terminal includes a Beidou short message communication circuit, a TYPE-C interface circuit and a power supply circuit, wherein the Beidou short message communication circuit is electrically connected to the TYPE-C interface circuit, the TYPE-C interface circuit and the power supply circuit are both electrically connected to a first TYPE-C interface, and the power supply circuit is also electrically connected to a second TYPE-C interface; The first TYPE-C interface is used to connect to a smart terminal, and the second TYPE-C interface is used to connect to a power adapter.

2. The Beidou satellite short message terminal according to claim 1, characterized in that: The Beidou short message communication circuit includes an S-frequency passive antenna, an L-frequency passive antenna, an S-frequency low-noise amplifier circuit, an L-frequency power amplifier circuit, an RDSS channel up-down frequency conversion circuit, a Beidou short message baseband circuit and a Beidou SIM card circuit. The S-frequency passive antenna is electrically connected to the RDSS channel up-down frequency conversion circuit through the S-frequency low-noise amplifier circuit, the L-frequency passive antenna is electrically connected to the RDSS channel up-down frequency conversion circuit through the L-frequency power amplifier circuit, and the RDSS channel up-down frequency conversion circuit, the Beidou SIM card circuit and the TYPE-C interface circuit are all electrically connected to the Beidou short message baseband circuit.

3. The Beidou satellite short message terminal according to claim 2, characterized in that: The S-frequency passive antenna supports an elevation angle of 20-90 degrees and an azimuth angle of 0-360 degrees.

4. The Beidou satellite short message terminal according to claim 2, characterized in that: The L-frequency passive antenna supports an elevation angle of 20-90 degrees and an azimuth angle of 0-360 degrees.

5. The Beidou satellite short message terminal according to claim 2, characterized in that: The power supply circuit includes a first power supply part and a second power supply part, the first power supply part is electrically connected to the first TYPE-C interface, and the second power supply part is electrically connected to the second TYPE-C interface.

6. The Beidou satellite short message terminal according to claim 5, characterized in that: The first power supply part includes a first outbound signal circuit branch and a first inbound signal circuit branch. The first outbound signal circuit is used to power the S-frequency passive antenna, the L-frequency passive antenna, the S-frequency low-noise amplifier circuit, the L-frequency power amplifier circuit, the RDSS channel up and down conversion circuit, the Beidou short message baseband circuit and the Beidou SIM card circuit; the first inbound signal circuit branch is powered by a supercapacitor.

7. The Beidou satellite short message terminal according to claim 5, characterized in that: The second power supply part includes a second outbound signal circuit branch, a second inbound signal circuit branch and a smart terminal charging branch. The second outbound signal circuit is used to power the S-frequency passive antenna, the L-frequency passive antenna, the S-frequency low-noise amplifier circuit, the L-frequency power amplifier circuit, the RDSS channel up and down conversion circuit, the Beidou short message baseband circuit and the Beidou SIM card circuit; the second inbound signal circuit branch is powered by a DC-DC converter, and the smart terminal charging branch powers the smart terminal through the first TYPE-C interface.

8. The Beidou satellite short message terminal according to claim 6, characterized in that: The voltage output by the first power supply part is 5V, and the current output is 500mA-1000mA.

9. The Beidou satellite short message terminal according to any one of claims 1 to 8, characterized in that: The intelligent terminal is a mobile phone.

10. The Beidou satellite short message terminal according to claim 9, characterized in that: The mobile phone is installed with a Beidou satellite short message APP, which has at least Beidou satellite short message signal strength display, Beidou short message user card basic information display, Beidou short message message reception and transmission and SOS alarm function.

Images