CN103684571A - Ultralow-delay digital high-definition image relay module of unmanned aerial vehicle - Google Patents

Abstract

The present invention proposes a UAV ultra-low-latency digital high-definition image relay module, including a power module, a receiving antenna for receiving space wireless signals, a bandpass filter connected to the receiving antenna and used for filtering wireless signals, A COFDM demodulation board connected with the bandpass filter and used to demodulate the wireless signal into a digital signal, a COFDM modulation board connected with the COFDM demodulation board and used to generate radio frequency signals of different frequency bands, connected with the COFDM modulation board and used for The linear power amplifier module that amplifies the radio frequency signal, the transmitting antenna connected to the COFDM modulation board and used to transmit the signal, respectively connected to the COFDM demodulation board and the COFDM modulation board and used for the external control terminal to set the parameters of the relay module control interface board. The problems of high difficulty in erecting relay stations, complicated installation process, difficult maintenance and high cost in the prior art are solved. The wireless image transmission system transmits images with high definition, small transmission delay, strong anti-interference ability, small volume and weight, and easy to use.

Description

UAV ultra-low latency digital high-definition image relay module

technical field

The invention relates to the field of communication technology, in particular to an ultra-low-latency digital high-definition image relay module for drones.

Background technique

With the development of wireless communication technology, wireless image transmission system has been widely used in public security, armed police, fire protection, electric power, petroleum, mining, transportation, forest fire prevention, emergency communication and other fields.

At present, the transmission distance of individual combat wireless image transmission systems is generally within 1km to 5km depending on the environment. If the transmission distance needs to be increased, in addition to increasing the transmission power, the best choice is to increase the relay station, and the relay station is large in size and takes a long time to install. It is unscientific and unacceptable to add such a relay station when the environment is harsh or emergency communication is required.

Contents of the invention

The purpose of the present invention is to provide a UAV ultra-low-latency digital high-definition image relay module with high image definition, small transmission delay, strong anti-interference ability, small volume and weight, and easy to use.

In order to achieve the above object, the present invention adopts the following technical solutions: a UAV ultra-low-latency digital high-definition image relay module, including a power module, a receiving antenna for receiving space wireless signals, connected to the receiving antenna and used Band-pass filter for filtering wireless signals, COFDM demodulation board connected with band-pass filter and used to demodulate wireless signals into digital signals, COFDM modulation connected with COFDM demodulation board and used to generate radio frequency signals in different frequency bands board, a linear power amplifier module connected to the COFDM modulation board and used to amplify the radio frequency signal, a transmitting antenna connected to the COFDM modulation board and used to transmit the signal, respectively connected to the COFDM demodulation board and the COFDM modulation board and used for external The control terminal is a control interface board for setting the parameters of the relay module.

Further, the COFDM demodulation board is provided with a DiB9090M chip.

Further, the COFDM modulation board is equipped with channel coding, OFDM modulation, frequency up-conversion and FPGA processor.

Further, it also includes a box body, and the bandpass filter, COFDM demodulation board, COFDM modulation board, linear power amplifier module, control interface board, and power supply module are all integrated into one body and arranged in the box body.

Further, the box body is composed of a casing and a cover covering the casing, and the casing is embedded with a power module interface, a receiving antenna interface, a transmitting antenna interface, and a control interface board interface.

Further, the receiving antenna, bandpass filter, COFDM demodulation board, COFDM modulation board, linear power amplifier module, control interface board, power supply module, and transmitting antenna are all connected by data lines.

The beneficial effects of the present invention are: after adopting the above-mentioned structure, all system modules are integrated and installed on the UAV, so that the relay module has high flexibility and can be used in emergency communication or harsh conditions, which solves the problem of existing In the technology, the relay station is difficult to erect, the installation process is complicated, difficult to maintain, and the cost is high. At the same time, the COFDM demodulation board and COFDM modulation board are used for signal processing. Therefore, the wireless image transmission system for individual combat has high image definition, small transmission delay, strong anti-interference ability, small size and weight, and easy to use.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are only the present invention in order to more clearly illustrate the present invention Embodiments or technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or prior art, for those of ordinary skill in the art, without paying creative work , and other drawings can also be obtained from these drawings.

Fig. 1 Principle block diagram of UAV ultra-low-latency digital high-definition image relay module;

Figure 2 Stereoscopic view of UAV ultra-low-latency digital high-definition image relay module;

Figure 3 Schematic diagram of the UAV ultra-low-latency digital high-definition image relay module structure;

Figure 4 COFDM demodulation board principle block diagram;

Figure 5 COFDM modulation frequency conversion board principle block diagram.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

A kind of unmanned aerial vehicle ultra-low delay digital high-definition image relay module as shown in Figure 1, Figure 2 and Figure 3, comprises power supply module 12, is used to receive the receiving antenna 7 of space wireless signal, is connected with receiving antenna 7 and A band-pass filter 9 for filtering wireless signals, a COFDM demodulation board 10 connected to the band-pass filter 9 and used to demodulate the wireless signal into a digital signal, connected to the COFDM demodulation board 10 and used to generate different frequency bands The COFDM modulation board 13 of the radio frequency signal, is connected with the COFDM modulation board 13 and is used for the linear power amplifier module 14 of radio frequency signal amplification, is connected with the COFDM modulation board 13 and is used for the transmitting antenna 8 that the signal is emitted out, demodulates with COFDM respectively The board 10 is connected to the COFDM modulation board 13 and is a control interface board used for setting the parameters of the relay module by the external control terminal.

The receiving antenna 7 receives the wireless signal from the space, passes through the bandpass filter 9, enters the COFDM demodulation board 10 to demodulate the TS stream digital signal, and then enters the COFDM modulation board 13 to generate a radio frequency signal of another frequency band, and the linear power amplifier module 14 The signal is amplified and finally transmitted through the transmitting antenna 8 .

The power supply module 12 is used to convert the power on the drone into the voltage required by other circuits of the module to provide power for the relay module. The control interface board 11 is the control board of the COFDM demodulation board 10 and the COFDM modulation board 13, used for The external control terminal sets the parameters of the module.

As shown in Figure 4, the COFDM demodulation board 10 uses a DiB9090M chip, the DiB9090M chip completes the processing process from RF radio frequency signals to MPEG-TS, internally integrates VHF, UHF and L-band receiving front ends, and has a high degree of integration. Simple and low cost. Easy to use, good receiving performance, high sensitivity.

As shown in FIG. 5 , the COFDM modulation board 13 is provided with channel coding, OFDM modulation, frequency up-conversion and FPGA processor. The TS stream signal demodulated by the COFDM demodulation board 10 directly enters the COFDM modulation board 13. The COFDM modulation board 13 is a digital modulation method combining channel coding and OFDM modulation, which provides powerful coding error correction capabilities. The basic method is to assign the high-speed data stream to several orthogonal sub-channels with a lower transmission rate for transmission through serial-to-parallel conversion, so it is called coded orthogonal frequency division multiplexing. The most important thing about this modulation method is to utilize Fast Fourier Transform (FFT) to realize multi-carrier modulation. The present invention selects FPGA as the core processor. As a parallel processing system, it can adopt parallel computing to complete complex design. COFDM demodulation board 10 demodulation Each TS packet of the output TS stream signal consists of 188bytes. After entering the FPGA processor, it mainly goes through energy diffusion, error correction coding, interleaving processing, frame formation, OFDM modulation and other processes. After being processed by the FPGA processor, the formed digital signal passes through DAC transforms to generate baseband quadrature signals, and finally performs quadrature modulation with radio frequency local oscillator signals generated by ADF4350 to generate radio frequency signals for wireless transmission.

As shown in Figure 2 and Figure 3, it also includes a box body, the bandpass filter 9, COFDM demodulation board 10, COFDM modulation board 13, linear power amplifier module 14, control interface board 11, power supply module 12 are all integrated into one And set in the box body, the box body is composed of a casing 1 and a cover 2 covering the casing 1, and the casing 1 is embedded with a power module interface 3, a receiving antenna interface 4, and a transmitting antenna Interface 5 and interface 6 of the control interface board. The receiving antenna 7, the bandpass filter 9, the COFDM demodulation board 10, the COFDM modulation board 13, the linear power amplifier module 14, the control interface board 11, the power supply module 12, and the transmitting antenna 8 are all connected by data lines; Integrate various systems into one, small in size and easy to carry.

In the process of use, in order to prevent the transmission signal from affecting the reception sensitivity, different frequencies are used for transmission and reception, and the distance between the two frequencies is ensured to be large enough. Increase the transmitting and receiving distance.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (6)

1. the ultralow time delay digital high-definition of a unmanned plane image trunk module, it is characterized in that: comprise power module (12), for receiving the reception antenna (7) of spacing wireless signal, be connected with reception antenna (7) and for filtering the band pass filter (9) of wireless signal, be connected with band pass filter (9) and separate tuned plate (10) for wireless signal being demodulated to the COFDM of digital signal, separate with COFDM that tuned plate (10) is connected and for generation of the COFDM modulation panel (13) of different frequency range radiofrequency signal, be connected with COFDM modulation panel (13) and the linear power amplification module (14) for radiofrequency signal is amplified, be connected with COFDM modulation panel (13) and the transmitting antenna (8) for signal is launched, separate with COFDM the control interface plate (11) that tuned plate (10) is connected with COFDM modulation panel (13) and for external control end, this trunk module parameter is arranged respectively.

2. the ultralow time delay digital high-definition of unmanned plane according to claim 1 image trunk module, is characterized in that: described COFDM separates tuned plate (10) and is provided with DiB9090M chip.

3. the ultralow time delay digital high-definition of unmanned plane according to claim 1 image trunk module, is characterized in that: described COFDM modulation panel (13) is provided with chnnel coding, OFDM modulation, up-conversion and FPGA processor.

4. the ultralow time delay digital high-definition of unmanned plane according to claim 1 image trunk module, it is characterized in that: also comprise box body, described band pass filter (9), COFDM solution tuned plate (10), COFDM modulation panel (13), linear power amplification module (14), control interface plate (11), power module (12) are all integrated in one and are located in this box body.

5. the ultralow time delay digital high-definition of unmanned plane according to claim 4 image trunk module, it is characterized in that: described box body is comprised of housing (1) and the lid (2) that is covered on housing (1), is embedded with power module interface (3), reception antenna interface (4), transmitting antenna interface (5) and control interface plate interface (6) on described housing (1).

6. according to the ultralow time delay digital high-definition of the unmanned plane image trunk module described in claim 1～5 any one claim, it is characterized in that: described reception antenna (7), band pass filter (9), COFDM solution tuned plate (10), COFDM modulation panel (13), linear power amplification module (14), control interface plate (11), power module (12), transmitting antenna all connect by data wire between (8).

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