Low cost ultra-short wave transmitter

Abstract

The utility model provides a kind of low cost ultrashort wave signaling machine, panel unit is configured to connect transceiver channel module, for voice signal acquisition and transceiver instruction issue;Transceiver channel module is configured to connect integrated service module, frequency synthesis module, panel unit and tuning module, for the reception and retransmission of voice signal;Integrated service module is configured to connect transceiver channel module, carries out voice encoding and decoding, filtering operation, timing control, channel control, voice and data transceiving and the issue of frequency conversion control instruction;Frequency synthesis module is configured to connect transceiver channel module, for generating radio frequency frequency;Tuning module is configured to connect transceiver channel module and radio frequency output module, for power amplification;Radio frequency output module is configured to connect tuning module, for transmitting output to signal.The utility model is in entire frequency band, 3dB bandwidth changes little, in 30MHz~88MHz range, noise coefficient is small, receiving dynamic range is high, tuning speed is fast.

Description

Technical Field

[0001] This utility model relates to the field of communication equipment, and in particular to a low-cost ultra-shortwave transmitter. Background Technology

[0002] Since the beginning of the new century, UHF wireless communication equipment has evolved from communication systems designed with discrete electronic components to those using large-scale integrated circuits. Many new technologies, devices, and processes in electronics (such as microelectronics, computer technology, software technology, and signal processing technology) have been widely applied, resulting in smaller, lighter, and lower-power radios with improved overall performance, reliability, consistency, and manufacturability. However, this has also led to higher costs, especially for different users, vehicle models, and application scenarios. To adapt to their diverse needs, different design modifications are required, resulting in significant R&D investment and a relatively longer development cycle. Summary of the Invention

[0003] In order to solve the problems existing in the background technology, this utility model proposes a low-cost ultra-shortwave transmitter.

[0004] A low-cost ultra-shortwave transmitter, including The panel unit is configured to connect to the transceiver channel module for the acquisition of voice signals and the issuance of transceiver commands. The transceiver channel module is configured to connect the integrated services module, frequency synthesis module, panel unit, and tuning module, and is used for the reception and forwarding of voice signals. The integrated service module is configured to connect to the transceiver channel module, providing a design platform and performing voice encoding / decoding, filtering operations, timing control, channel control, voice and data transmission / reception, and frequency switching control command issuance. A frequency synthesis module, configured to connect to a transceiver channel module, is used to generate radio frequency frequencies; A tuning module, configured to connect the transceiver channel module and the RF output module, is used for power amplification; The radio frequency output module is configured to connect to the tuning module and is used to transmit and output the signal processed by the tuning module.

[0005] Based on the above, the integrated service module includes: a field-programmable gate array (FPGA), configured to connect to a digital signal processor (DSP) for logic control and channel timing control; and a DSP, configured to connect to the FPGA for voice encoding / decoding, filtering algorithm operation, timing control, voice and data transmission / reception, serial communication with the panel, receiving and processing data packets from external ports, voice digital processing, and channel control.

[0006] Based on the above, the field-programmable gate array (FPGA) is connected to the digital signal processor (DSP), which is connected to the DSP via the AMBE module. The FPGA is also connected to interface B via the LTC1446. The DSP is interactively connected to the AU module, and both the DSP and the AU module are bidirectionally connected to interface B.

[0007] Based on the above, the frequency synthesis module includes a direct digital frequency synthesizer, a phase-locked loop, and a voltage-controlled oscillator circuit. The direct digital frequency synthesizer receives frequency information and the output signal of the power distribution circuit, and inputs the synthesized frequency signal to the phase detector through a low-frequency filter circuit. The output of the phase detector is connected to the voltage-controlled oscillator through a loop filter circuit. The output of the voltage-controlled oscillator is then output to the transceiver channel module through a power distribution circuit and a buffer amplifier circuit.

[0008] Based on the above, the tuning module includes a high-Q tuning inductor and a bandpass filter.

[0009] Based on the above, the Q value of a high-Q tuned inductor should be at least 250.

[0010] This invention represents a substantial advancement over existing technologies. Specifically, it modulates and demodulates the input signal, amplifies it, transmits it into the air, and then uses radio frequency signal receiving technology to achieve long-distance wireless signal transmission. It features miniaturization, digitization, and high sensitivity. Attached Figure Description

[0011] Figure 1 This is a schematic block diagram of the structure of this utility model.

[0012] Figure 2 This is a circuit block diagram of the integrated business module of this utility model.

[0013] Figure 3 This is a circuit block diagram of the frequency synthesis module of this utility model. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] like Figures 1-3As shown, a low-cost VHF transmitter includes a panel unit configured to connect to a transceiver channel module for acquiring voice signals and issuing transceiver commands; a transceiver channel module configured to connect to an integrated services module, a frequency synthesis module, the panel unit, and a tuning module for receiving and forwarding voice signals; an integrated services module configured to connect to the transceiver channel module for providing a design platform and issuing commands for voice encoding / decoding, filtering, timing control, channel control, voice and data transmission / reception, and frequency switching control; a frequency synthesis module configured to connect to the transceiver channel module for generating radio frequency; a tuning module configured to connect to the transceiver channel module and a radio frequency output module for power amplification; and a radio frequency output module configured to connect to the tuning module for transmitting the signal processed by the tuning module.

[0016] The integrated service module adopts a "DSP+FPGA" architecture integrated service platform. It uses a large-scale field-programmable gate array (FPGA) to replace the original discrete devices and a digital signal processor (DSP) to handle voice and data encoding and decoding. The DSP mainly handles voice encoding and decoding, filtering operations, timing control, voice and data transmission and reception, serial communication with the panel, receiving and processing data packets from external ports, voice digital processing, and channel control. The FPGA programmable logic array mainly handles logic control and channel timing control. This platform has formed a general-purpose design platform on which different waveforms can be loaded as needed to achieve data communication.

[0017] Specifically, Figure 2 The interface connects to the transceiver channel module, which in turn connects to the panel unit. Analog signals, such as voice signals, are amplified by the panel unit and sent to the AU circuit (amplifier circuit) of the integrated service unit. These signals are converted into TXBBA signals and then processed by the DSP for encoding and logic control in the FPGA. Finally, the LT1446 (DA converter) generates quadrature I / Q signals, which are then quadraturely modulated on the transceiver channel module to form the RF excitation signal. This excitation signal undergoes low-noise amplification, filtering, and power amplification before being sent to the antenna for transmission. The AMBE chip is a voice codec chip used to encode and decode the voice signal before sending it to the DSP for further processing, such as filtering.

[0018] like Figure 3As shown, the frequency synthesis module combines a direct digital frequency synthesizer (DDS), a phase-locked loop (PLL), and a voltage-controlled oscillator (VCO) to generate frequencies with low spurious emissions, high resolution, and rapid switching within the 30-90MHz frequency band. It is designed and manufactured as a small, mature module. In use, it only requires sending a serial control code to the integrated service module based on the required frequency and status, achieving stable frequency output. The output frequency signal undergoes filtering by a low-pass filter circuit, phase detection by a phase detector, further filtering by a switching filter circuit, and modulation and mixing by the VCO. Then, it is distributed by a power distribution circuit. One part enters the DDS to form a PLL, and the other part enters a buffer amplifier circuit for amplification before being output to the transceiver channel module. A temperature-compensated crystal oscillator circuit is used for temperature compensation of the phase detector. The PLL directly generates the frequency based on the frequency information. After passing through a low-pass filter and a phase detector, it generates a voltage-controlled VCO output. In this embodiment, the PLL uses an HMC930, which generates high-accuracy and stable frequencies.

[0019] The tuning module employs a voltage-controlled adjustable bandpass filter module constructed from a high-Q tuning inductor and a varactor diode whose capacitance can be controlled by reverse voltage. During the design phase, binary codes for tuning voltages corresponding to different frequencies are selected based on conditions and pre-stored in a data memory. In use, the operating frequency is determined by looking up a table in the data memory, and the analog voltage is output via a DA converter. After amplification by a fixed-ratio operational amplifier, this voltage serves as the tuning voltage for the tuning unit, enabling the tuning unit to achieve a bandpass filter response for different frequencies. In this embodiment, the high-Q tuning inductor uses a copper wire-wound loop coil made of silver-copper alloy, achieving a Q value exceeding 250.

[0020] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A low cost ultra-short wave transmitter, characterized by: include The panel unit is configured to connect to the transceiver channel module for the acquisition of voice signals and the issuance of transceiver commands. The transceiver channel module is configured to connect the integrated services module, frequency synthesis module, panel unit, and tuning module, and is used for the reception and forwarding of voice signals. The integrated service module is configured to connect to the transceiver channel module, providing a design platform and performing voice encoding / decoding, filtering operations, timing control, channel control, voice and data transmission / reception, and frequency switching control command issuance. A frequency synthesis module, configured to connect to a transceiver channel module, is used to generate radio frequency frequencies; A tuning module, configured to connect the transceiver channel module and the RF output module, is used for power amplification; The radio frequency output module is configured to connect to the tuning module and is used to transmit and output the signal processed by the tuning module.

2. The low-cost VHF transmitter according to claim 1, characterized in that, The integrated business module includes: A field-programmable gate array, configured to connect to a digital signal processor, is used to perform logic control and channel timing control; The digital signal processor is configured to connect to a field-programmable gate array (FPGA) and is used to perform voice encoding and decoding, filtering operations, timing control, voice and data transmission and reception, serial communication with the panel, receiving and processing data packets from external ports, voice digital processing, and channel control.

3. The low cost ultra-short wave transmitter according to claim 2, characterized in that: The field-programmable gate array (FPGA) is connected to the digital signal processor (DSP). The FPGA is connected to the DSP via the AMBE module. The FPGA is also connected to interface B via the LTC1446. The DSP is interactively connected to the AU module. The DSP and the AU module are bidirectionally connected to interface B.

4. The low cost ultrashort wave transmitter according to claim 1, characterized in that: The frequency synthesis module includes a direct digital frequency synthesizer, a phase-locked loop, and a voltage-controlled oscillator circuit. The direct digital frequency synthesizer receives frequency information and the output signal of the power distribution circuit, and inputs the synthesized frequency signal to the phase detector through a low-frequency filter circuit. The output of the phase detector is connected to the voltage-controlled oscillator through a loop filter circuit. The output of the voltage-controlled oscillator is then output to the transceiver channel module through a power distribution circuit and a buffer amplifier circuit.

5. The low cost ultrashort wave transmitter according to claim 1, characterized in that: The tuning module includes a high-Q tuned inductor and a bandpass filter.

6. The low-cost VHF transmitter according to claim 5, characterized in that: The Q value of a high-Q tuned inductor is at least 250.

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