Frequency hopping transmitting device and frequency hopping communication system formed by same

Abstract

The utility model provides a frequency hopping transmitting device and a frequency hopping communication system formed by the same, and relates to the technical field of radio communication, the frequency hopping transmitting device comprises a frequency hopping local oscillator unit, an L frequency band transmitting channel and a C frequency band transmitting channel, the frequency hopping local oscillator unit comprises a radio frequency transmitter, a radio frequency balun transformer, a first low-pass filter and a second low-pass filter, the radio frequency transmitter is composed of a digital control oscillator, an L-band local oscillator signal and a C-band local oscillator signal are respectively output to a first low-pass filter and a second low-pass filter through two radio frequency balun transformers, and the first low-pass filter transmits the L-band local oscillator signal to an L-band transmitting channel. And the second low-pass filter transmits the C-band local oscillator signal to the C-band transmitting channel. The frequency hopping local oscillator unit provided by the utility model takes the digital control oscillator as a core, has the advantages of small volume and low power consumption, and can greatly reduce the size of a filter without influencing the performance of the filter.

Description

TECHNICAL FIELD

[0001] The utility model relates to wireless communication technical field especially relates to a frequency hopping transmitting device and the frequency hopping communication system formed by it. BACKGROUND

[0002] The transceiving frequency signal of the ground terminal equipment of the frequency hopping communication system of spaceflight and satellite communication frequency band needs to satisfy the high speed frequency hopping in the 1.6GHz wide frequency band range of C frequency band, the frequency hopping rate is better than 20000 hops / second, the in-band spur is not more than -50dBc, and the frequency resolution is 10Hz.If compatible with supporting L frequency band data link system, it also needs to satisfy the high speed frequency hopping in the 300MHz frequency band range of L frequency band, the frequency hopping rate is better than 76923 hops / second, the in-band spur is not more than -50dBc, the frequency resolution is 10Hz, and the phase is continuous.Therefore, if the LC dual-frequency band transmitting frequency conversion device with 100,000 frequency hopping capabilities is developed, the design core is 100,000 high speed frequency hopping local oscillator unit.

[0003] Considering the design requirements of high frequency hopping rate, low frequency resolution and phase continuity, the existing frequency hopping local oscillator unit takes the direct digital synthesizer (DDS) as the frequency hopping core, the DDS has the advantages of fast frequency conversion, extremely small frequency resolution and continuous phase, but is limited by the defects of poor spur performance when the output frequency band is low, high frequency or wide frequency band, so a combination of mixing or frequency multiplication is usually adopted to expand the output frequency range and improve the in-band spur, however, a variety of bandpass filters, linear amplifiers, 2 frequency multipliers and other devices are needed in the circuit, and structural shielding and isolation are also essential, resulting in large power consumption, volume and weight of the local oscillator unit. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of frequency hopping transmitting device and the frequency hopping communication system formed by it, can greatly reduce filter size without affecting filter performance.

[0005] The utility model provides a kind of frequency hopping transmitting device, including frequency hopping local oscillator unit, L frequency band transmitting channel and C frequency band transmitting channel, the frequency hopping local oscillator unit includes radio frequency transmitter, radio frequency balun transformer, first low pass filter and second low pass filter, the radio frequency transmitter is constituted by digital control oscillator, and L frequency band local oscillator signal and C frequency band local oscillator signal are respectively output to the first low pass filter and the second low pass filter by two radio frequency balun transformers, the first low pass filter transmits the L frequency band local oscillator signal to the L frequency band transmitting channel, and the second low pass filter transmits the C frequency band local oscillator signal to the C frequency band transmitting channel.

[0006] As an embodiment, the L-band transmitting channel adopts a one-time down-conversion design, and comprises a first band-pass filter, a first mixer, a third band-pass filter, a first adjustable amplifier and a fourth band-pass filter connected in sequence, wherein the first mixer is connected with the first low-pass filter.

[0007] As an embodiment, the first band-pass filter adopts a band-pass acoustic table filter with a bandwidth of 60MHz, for suppressing leakage signals of the L-band local oscillator signal; the third band-pass filter and the fourth band-pass filter adopt low-temperature co-fired ceramic filters with a bandwidth of 360MHz, for suppressing leakage signals of the L-band local oscillator signal, and intermodulation spurious and harmonic interference generated by the first mixer.

[0008] As an embodiment, the input signal of the L-band transmitting channel is a 1740MHz signal, and the output signal is an L-band signal, the power of the L-band signal being -45dBm-5dBm, and the first adjustable amplifier is used to adjust the power of the L-band signal in steps of 0.5dB.

[0009] As an embodiment, the first adjustable amplifier is composed of two-stage adjustable gain amplifiers connected in cascade, and a single adjustable gain amplifier is composed of a 0-31.75dB digital attenuator and a 16dB fixed gain amplifier, and the two-stage power adjustment range is -55dBm-8dBm.

[0010] As an embodiment, the C-band transmitting channel adopts a one-time up-conversion design, and comprises a second band-pass filter, a second mixer, a fifth band-pass filter, a second adjustable amplifier and a sixth band-pass filter connected in sequence, wherein the second mixer is connected with the second low-pass filter.

[0011] As an embodiment, the second band-pass filter adopts a band-pass acoustic table filter with a bandwidth of 60MHz, for suppressing leakage signals of the C-band local oscillator signal; the fifth band-pass filter and the sixth band-pass filter adopt LC filters with a bandwidth of 1600MHz, for suppressing leakage signals of the L-band local oscillator signal, and intermodulation spurious and harmonic interference generated by the first mixer.

[0012] As an embodiment, the input signal of the C-band transmitting channel is a 1940MHz signal, and the output signal is a C-band signal, the power of the C-band signal being -45dBm-5dBm, and the second adjustable amplifier is used to adjust the power of the C-band signal in steps of 0.5dB.

[0013] As an embodiment, the second adjustable amplifier is composed of two-stage adjustable gain amplifier in series, and each adjustable gain amplifier is composed of a 0-31.75dB digitally controlled attenuator and a 16dB fixed gain amplifier, and the two-stage power regulation range is -55dBm-8dBm.

[0014] The utility model further provides a frequency hopping communication system, including any one frequency hopping transmitting device.

[0015] The frequency hopping transmitting device and the frequency hopping communication system formed by the same provided by the utility model comprise a frequency hopping local oscillator unit, an L frequency band transmitting channel and a C frequency band transmitting channel, the frequency hopping local oscillator unit comprises a radio frequency transmitter, a radio frequency balun transformer, a first low pass filter and a second low pass filter, the radio frequency transmitter is composed of a digital control oscillator, two-way radio frequency balun transformers respectively output L frequency band local oscillator signals and C frequency band local oscillator signals to the first low pass filter and the second low pass filter, the first low pass filter transmits the L frequency band local oscillator signals to the L frequency band transmitting channel, and the second low pass filter transmits the C frequency band local oscillator signals to the C frequency band transmitting channel. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0017] Figure 1 It is the circuit schematic diagram of the prior art high-speed frequency hopping local oscillator unit.

[0018] Figure 2 It is the circuit schematic diagram of the frequency hopping transmitting device provided by the utility model.

[0019] Figure 3 It is the output stray distribution diagram of the first mixer provided by the utility model.

[0020] Figure 4 It is the output stray distribution diagram of the second mixer provided by the utility model.

[0021] In the figure: 100 - frequency hopping local oscillator unit, 110 - radio frequency transmitter, 120 - radio frequency balun, 130 - first low pass filter, 140 - second low pass filter, 200 - L-band transmitting channel, 210 - first band pass filter, 220 - first mixer, 230 - third band pass filter, 240 - first adjustable amplifier, 250 - fourth band pass filter, 300 - C-band transmitting channel, 310 - second band pass filter, 320 - second mixer, 330 - fifth band pass filter, 340 - second adjustable amplifier, 350 - sixth band pass filter. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme in the utility model will be described clearly and completely below in combination with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0023] Figure 1 It is the circuit schematic diagram of the existing high-speed frequency hopping local oscillator unit, which shows the frequency multiplication chain circuit design schematic diagram with the domestic DDS (Chengdu Zhenxin GM4912C) as the core. Based on two chips DDS1 and DDS2, two base frequency single carriers are output through SPI serial bus SPI-1 and SPI-2 for initialization and parameter configuration, which meet the frequency hopping rate requirement of 100,000 hops per second. One way of 1035MHz-1435MHz passes through two-stage 2 frequency multiplication, amplifier, filter, radio frequency switch and other devices, and outputs the required frequency range of 4140MHz-5740MHz of C local oscillator. The other way of 1350MHz-1500MHz passes through one-stage 2 frequency multiplication, amplifier, filter and other devices, and outputs the required frequency range of 2700MHz-3000MHz of L local oscillator. Among them, the 2 frequency multiplication frequency of 2070MHz-2870MHz output by DDS1 exists three harmonics of 6210MHz-8610MHz after 2 frequency multiplication, which is close to the upper limit of the local oscillator frequency of 5740MHz, so the filter design difficulty is increased, and therefore the first way uses a band pass filter switch group for grouping filtering processing.

[0024] The high-speed frequency hopping local oscillator unit based on the DDS frequency multiplication chain has the following defects:

[0025] 1) The lower the base frequency range output by the DDS chip itself, the better the spurious performance in a certain bandwidth, but the more the frequency multiplication times required, the worse the harmonic spurious, and the filter switch group is needed for segmental suppression of adjacent interference signals, and the overall circuit is complex.

[0026] 2) the higher the out-of-band rejection performance requirement of the band-pass filter in the circuit is, the larger the size is, and the larger the circuit area is when the number is large, the higher the linearity requirement of the frequency multiplier to the amplifier is, and the circuit power consumption is increased when the number is large;

[0027] 3) the frequency multiplier generates extra unwanted interference spectrum, and good structure shielding and isolation are needed to ensure the output wideband spurious index requirement, and the weight is increased when the structure size is large.

[0028] To solve at least one of the above technical defects, the utility model provides a frequency hopping transmitting device and a frequency hopping communication system constituted by the same, and the following description is made in combination with the drawings Figures 1-4 The utility model is described in detail.

[0029] Figure 2 It is the circuit schematic drawing of the frequency hopping transmitting device provided by the utility model, as Figure 2 The utility model provides a frequency hopping transmitting device, which comprises a frequency hopping local oscillator unit 100, an L frequency band transmitting channel 200 and a C frequency band transmitting channel 300, the frequency hopping local oscillator unit 100 comprises a radio frequency transmitter 110, a radio frequency balun transformer 120, a first low-pass filter 130 and a second low-pass filter 140, the radio frequency transmitter 110 is constituted by a digital control oscillator, and two-way radio frequency balun transformers 120 respectively output L frequency band local oscillator signals and C frequency band local oscillator signals to the first low-pass filter 130 and the second low-pass filter 140, the first low-pass filter 130 transmits the L frequency band local oscillator signal to the L frequency band transmitting channel 200, and the second low-pass filter 140 transmits the C frequency band local oscillator signal to the C frequency band transmitting channel 300.

[0030] The frequency hopping transmitting device provided by the utility model is a wideband 100,000 frequency hopping transmitting device circuit, therefore, the frequency hopping local oscillator unit 100 is a wideband high-speed frequency hopping local oscillator unit 100, the radio frequency transmitter 110 adopts a digital control oscillator, and is combined with ultra-low noise power conversion, a radio frequency balun transformer 120, a low-pass or high-pass filter and the like, to output a frequency hopping local oscillator with a wideband 2700MHz-5740MHz and a high hopping speed 100,000 hops / s.

[0031] It can be understood that the frequency hopping local oscillator unit 100 takes a digital control oscillator as the core, has the advantages of small size and low power consumption, and can greatly reduce the filter size without affecting the filter performance.

[0032] On the basis of the above-mentioned embodiments, as an optional embodiment, the frequency hopping local oscillator unit 100 takes the domestic broadband radio frequency transmitter 110 as the core, utilizes the high-performance high-frequency digital control oscillator NCO, high-speed digital-to-analog converter DAC, and high-performance low-noise phase-locked loop inside the radio frequency transmitter 110, and can directly output a frequency hopping carrier signal with a frequency range covering 10MHz-6GHz and a frequency hopping rate better than 100,000 hops / s. In the embodiment, the output frequency range of the frequency hopping local oscillator unit 100 is two local oscillator signals, i.e., an L-band local oscillator signal (2700MHz-3000MHz) and a C-band local oscillator signal (4140MHz-5740MHz).

[0033] The radio frequency transmitter 110 used in the utility model has two same DDS digital modulation channels, each channel contains digital I, Q data stream, digital modulator, digital control oscillator NCO, gain adjustment and arccosine Gain / Sinc, digital-to-analog converter DAC, etc. The built-in high-performance sampling clock phase-locked loop PLL has a lock-in frequency clock of 12GHz, which is used as the system sampling clock of NCO-A, NCO-B and high-speed DAC, and has excellent phase noise performance. The NCO effective data bit can reach 32 bits, which greatly reduces the spurious noise floor caused by phase truncation and amplitude quantization.

[0034] The peripheral circuit of the radio frequency transmitter 110 contains control input, power supply input, clock input and output matching filter, and the function design is briefly described as follows:

[0035] 1) Control input: all registers of the radio frequency transmitter chip can be configured through 6-core interfaces of 4 configuration SPIs and 2 jump controls update, and the digital I, Q data stream is configured as internal direct current bias to simplify external pin connection;

[0036] 2) Power supply input: the chip power supply voltages are DC1.0V and DC2.0V, respectively, which are obtained by outputting from an external input voltage through an ultra-low noise low-drop linear power supply conversion chip;

[0037] 3) Clock input: a low-noise reference clock with a recommended input frequency of 100MHz and a power of 3-6dBm is converted into differential input through a 1:2 radio frequency balun transformer 120;

[0038] 4) Output matching filter: the differential output of the chip is converted into single-ended through a 2:1 radio frequency balun transformer 120, and then suppressed through a low-pass filter to suppress the first mirror frequency signal (9000MHz-9300MHz) and the second mirror frequency signal (6260MHz-7860MHz).

[0039] Through test verification, the frequency hopping local oscillator unit 100 composed of the radio frequency transmitter 110 has the following key performance indicators: the frequency hopping rate can reach 250,000 hops / s, the frequency range supports 10MHz-6GHz, the frequency resolution is lower than 2.8Hz, the 5GHz phase noise is better than 93dBc@10kHz and 106dBc@100kHz, and the wideband spur is not greater than-58dBc.

[0040] It can be understood that the frequency hopping local oscillator unit 100 has the advantages of small size (35mm*35mm*7mm), low power consumption (1.8W for a single channel and 2.8W for a double channel), and high frequency, and can greatly reduce the size of the filter without affecting the performance of the filter.

[0041] On the basis of the above embodiment, as an optional embodiment, the L frequency band transmitting channel 200 adopts a one-time down-conversion design, comprising a first band-pass filter 210, a first mixer 220, a third band-pass filter 230, a first adjustable amplifier 240 and a fourth band-pass filter 250 connected in sequence, and the first mixer 220 is connected with the first low-pass filter 130. The L frequency band adopts a one-time down-conversion design, and converts the fixed frequency 1740MHz input signal into an L frequency band signal (960MHz-1260MHz).

[0042] Optionally, the first band-pass filter 210 adopts a band-pass acoustic table filter with a bandwidth of 60MHz, which is used to suppress the leakage signal of the L frequency band local oscillator signal, and avoid the intermodulation interference between the L frequency band local oscillator signal and the C frequency band local oscillator signal; the third band-pass filter 230 and the fourth band-pass filter 250 adopt a low-temperature co-fired ceramic filter with a bandwidth of 360MHz, which is used to suppress the leakage signal of the L frequency band local oscillator signal and the intermodulation spur interference and harmonic interference generated by the first mixer 220.

[0043] The first mixer 220 outputs a mixed distribution diagram as shown in Figure 3 Through simulation analysis, the first mixer 220 effectively avoids the actual output frequency range for various spur frequencies, and the frequency interval is hundreds of MHz, which is beneficial to the miniaturization of the filter, and has excellent suppression effect on the intermodulation combination spur and the harmonic spur level. In addition, the first mixer 220 is a double-balanced single-ended lead structure, and has a built-in local oscillator buffer amplifier. The working frequency covers 1GHz-12GHz, and can be used for up-conversion or down-conversion. The low-voltage power supply is 3.3V, the P1dB can reach 11dBm, and the port isolation is better than 38dB.

[0044] Optionally, the input signal of the L-band transmitting channel 200 is a 1740MHz signal, and the output signal is an L-band signal, the power of the L-band signal being -45dBm-5dBm, and the first adjustable amplifier 240 is used to adjust the power of the L-band signal in steps of 0.5dB. Optionally, the first adjustable amplifier 240 is composed of two-stage adjustable gain amplifiers in cascade, and a single adjustable gain amplifier is composed of a 0-31.75dB digitally controlled attenuator and a 16dB fixed gain amplifier, and the two-stage power adjustment range is -55dBm-8dBm. The output power requires an adjustment range of -45dBm-5dBm, i.e. 50dB dynamic adjustment, so a two-stage digitally controlled attenuator with a dynamic range of 0-31.75dB and a step of 0.25dB is required to realize the adjustment.

[0045] It can be understood that the L-band transmitting channel 200 adopts a one-stage frequency conversion design, preferably an input fixed frequency, to reduce the filter implementation complexity and cost.

[0046] On the basis of the above embodiment, as an optional embodiment, the C-band transmitting channel 300 adopts a one-stage up-conversion design, and includes a second band-pass filter 310, a second mixer 320, a fifth band-pass filter 330, a second adjustable amplifier 340 and a sixth band-pass filter 350 connected in sequence, and the second mixer 320 is connected with the second low-pass filter 140. The C-band adopts a one-stage up-conversion design to convert a fixed frequency 1940MHz input into a C-band (2200MHz-3800MHz).

[0047] Optionally, the second band-pass filter 310 adopts a band-pass acoustic table filter with a bandwidth of 60MHz, which is used to suppress the leakage signal of the C-band local oscillator signal; the fifth band-pass filter 330 and the sixth band-pass filter 350 adopt LC filters with a bandwidth of 1600MHz, which are used to suppress the leakage signal of the L-band local oscillator signal and the intermodulation spurious and harmonic interference generated by the first mixer 220.

[0048] Optionally, the input signal of the C-band transmitting channel 300 is a 1940MHz signal, and the output signal is a C-band signal, the power of the C-band signal being -45dBm-5dBm, and the second adjustable amplifier 340 is used to adjust the power of the C-band signal in steps of 0.5dB. The second adjustable amplifier 340 is composed of two-stage adjustable gain amplifiers in cascade, and a single adjustable gain amplifier is composed of a 0-31.75dB digitally controlled attenuator and a 16dB fixed gain amplifier, and the two-stage power adjustment range is -55dBm-8dBm. The output power requires an adjustment range of -45dBm-5dBm, i.e. 50dB dynamic adjustment, so a two-stage digitally controlled attenuator with a dynamic range of 0-31.75dB and a step of 0.25dB is required to realize the adjustment.

[0049] The output mixed frequency distribution of the second mixer 320 is shown in the figure Figure 4 Through simulation analysis, the output mixed frequency of the second mixer 320 effectively avoids the actual output frequency range, and the frequency interval is hundreds of MHz, which is beneficial to the miniaturization of the filter, and has excellent suppression effect on the intermodulation combination spurs and harmonic spur levels, or the high-order intermodulation spur components are far lower than the output frequency, and do not constitute performance degradation. In addition, the second mixer 320 is a double-balanced single-ended lead structure, and has a built-in local oscillator buffer amplifier. The working frequency covers 1GHz-12GHz, and can be used for up-conversion or down-conversion. The low-voltage power supply is 3.3V, the P1dB can reach 11dBm, and the port isolation is better than 38dB.

[0050] It can be understood that the C-band transmitting channel 300 adopts a one-stage frequency conversion design, preferably inputs a fixed frequency, reduces the filter implementation complexity, and reduces the cost.

[0051] In summary, compared with the prior art, the frequency hopping transmitting device has the following advantages:

[0052] 1) High frequency range expansion: the frequency hopping local oscillator unit 100 has an output frequency range of 10MHz-6GHz, a very wide frequency range, a simple circuit and control interface, and can change any output frequency through the SPI control interface configuration, and can be quickly transplanted to any high-speed frequency hopping communication system.

[0053] 2) Low spur and low phase noise: the system clock of the NCO and DAC in the frequency hopping local oscillator unit 100 is derived from a super-low-noise high-frequency 12GHz phase-locked loop, the output frequency hopping wideband spur is better than -58dBc, the phase noise of the 5GHz frequency point is better than 93dBc@10kHz and 106dBc@100kHz, and the performance index is excellent.

[0054] 3) Low power consumption: the frequency hopping local oscillator unit 100 only needs DC1.0V and DC2.0V low-voltage power supply, the single-path frequency hopping output power is only 1.8W, and the two-path frequency hopping output is about 2.8W. Compared with the dual-path power consumption of 3.6W of the DDS frequency multiplication chain high-speed frequency hopping local oscillator design, it is reduced by about 28%.

[0055] 4) Small size: the frequency hopping local oscillator unit 100 has an outer dimension of 35mm*35mm*7mm and a weight of only 28g. Compared with the size of the DDS frequency multiplication chain high-speed frequency hopping local oscillator design, it is reduced by about 230%, and the weight is reduced by about 380%.

[0056] 5) Low complexity: in the frequency conversion design of the transmitting frequency conversion channel, the input is a fixed frequency, the filter implementation complexity is reduced, and the miniaturization and low-cost design is realized.

[0057] The frequency hopping communication system provided by the utility model is described below, and the frequency hopping communication system described below can be correspondingly referred to the frequency hopping transmitting device described above.

[0058] The utility model further provides a kind of frequency hopping communication system, including the frequency hopping transmitting device described in any item.Specifically, frequency hopping transmitting device can be configured by SPI control interface, change its output frequency, so as to be transplanted and applied in arbitrary high-speed frequency hopping system.

[0059] It can be understood that the frequency hopping communication system provided by the utility model has the technical effect corresponding to any of the above frequency hopping transmitting devices, which will not be repeated.

[0060] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; Although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A frequency hopping transmitting apparatus characterized by comprising: The frequency hopping local oscillator unit comprises a radio frequency transmitter, a radio frequency balun transformer, a first low pass filter and a second low pass filter, the radio frequency transmitter is composed of a digital control oscillator, and an L frequency band local oscillator signal and a C frequency band local oscillator signal are respectively output to the first low pass filter and the second low pass filter through two radio frequency balun transformers, the first low pass filter transmits the L frequency band local oscillator signal to the L frequency band transmitting channel, and the second low pass filter transmits the C frequency band local oscillator signal to the C frequency band transmitting channel.

2. The frequency hopping transmitting apparatus according to claim 1, wherein The L frequency band transmitting channel adopts a one-time down-conversion design and comprises a first band pass filter, a first mixer, a third band pass filter, a first adjustable amplifier and a fourth band pass filter connected in sequence, and the first mixer is connected with the first low pass filter.

3. The frequency hopping transmitting apparatus of claim 2, wherein The first band pass filter adopts a band pass acoustic table filter with a bandwidth of 60MHz and is used for suppressing a leakage signal of the L frequency band local oscillator signal, the third band pass filter and the fourth band pass filter adopt low temperature co-fired ceramic filters with a bandwidth of 360MHz and are used for suppressing the leakage signal of the L frequency band local oscillator signal, intermodulation spurious interference and harmonic interference generated by the first mixer.

4. The frequency hopping transmitting apparatus of claim 2, wherein The input signal of the L frequency band transmitting channel is a 1740MHz signal, the output signal is an L frequency band signal, the power of the L frequency band signal is-45dBm-5dBm, and the first adjustable amplifier is used for adjusting the power of the L frequency band signal in steps of 0.5dB.

5. The frequency hopping transmitting apparatus of claim 4, wherein The first adjustable amplifier is composed of two-stage adjustable gain amplifiers in cascade, a single adjustable gain amplifier is composed of a 0-31.75dB digital control attenuator and a 16dB fixed gain amplifier, and the two-stage power adjustment range is-55dBm-8dBm.

6. The frequency hopping transmitting apparatus according to any one of claims 2 to 5, wherein The C frequency band transmitting channel adopts a one-time up-conversion design and comprises a second band pass filter, a second mixer, a fifth band pass filter, a second adjustable amplifier and a sixth band pass filter connected in sequence, and the second mixer is connected with the second low pass filter.

7. The frequency hopping transmitting apparatus of claim 6, wherein The second band pass filter adopts a band pass acoustic table filter with a bandwidth of 60MHz and is used for suppressing a leakage signal of the C frequency band local oscillator signal, the fifth band pass filter and the sixth band pass filter adopt LC filters with a bandwidth of 1600MHz and are used for suppressing the leakage signal of the L frequency band local oscillator signal, intermodulation spurious interference and harmonic interference generated by the first mixer.

8. The frequency hopping transmitting apparatus of claim 6, wherein The input signal of the C frequency band transmitting channel is a 1940MHz signal, the output signal is a C frequency band signal, the power of the C frequency band signal is-45dBm-5dBm, and the second adjustable amplifier is used for adjusting the power of the C frequency band signal in steps of 0.5dB.

9. The frequency hopping transmitting apparatus of claim 8, wherein The second adjustable amplifier is composed of two-stage adjustable gain amplifiers in cascade, a single adjustable gain amplifier is composed of a 0-31.75dB digital control attenuator and a 16dB fixed gain amplifier, and the two-stage power adjustment range is-55dBm-8dBm.

10. A frequency hopping communication system, characterized by The frequency hopping transmitting device comprises the frequency hopping transmitting device according to any one of claims 1-9.

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