CN201436788U - Short wave preselector - Google Patents
Short wave preselector Download PDFInfo
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- CN201436788U CN201436788U CN200920058685XU CN200920058685U CN201436788U CN 201436788 U CN201436788 U CN 201436788U CN 200920058685X U CN200920058685X U CN 200920058685XU CN 200920058685 U CN200920058685 U CN 200920058685U CN 201436788 U CN201436788 U CN 201436788U
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- pin diode
- circuit
- preselector
- control
- shortwave
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Abstract
The utility model discloses a short wave preselector, comprising a control circuit for receiving control instruction transmitted from a receiver, transferring data of inner specific central frequency point and outputting high level or low level to control a PIN diode drive circuit based on the control instruction; the PIN diode drive circuit for controlling self working conditions to be switched under two conditions of high voltage and lower voltage based on the high level or low level outputted by the control circuit, so as to control conduction condition of a PIN diode capacitor array; the PIN diode capacitor array, based on the working condition of the PIN diode drive circuit, for controlling whether the capacitors in the PIN diode capacitor array are conducted or not and participating to form a resonance loop with a resonance circuit; the resonance circuit for selecting a short wave radio frequency signal and forming the resonance loop with the conducted capacitors in the PIN diode capacitor array, selecting and outputting useful signal of the specific frequency point in the short wave radio frequency signal. The frequency selecting speed of the short wave preselector is faster.
Description
Technical field
The utility model relates to digital tuning frequency hopping communications technology, relates in particular to a kind of shortwave preselector.
Background technology
Frequency hopping is a kind of spread spectrum with high noise immunity, high anti-interception capability.Traditional decide frequency communication system carrier fixed-frequency, interference free performance is poor, in the tactics electronic countermeasures, is easy to be intercepted and captured by the enemy information content of transmission, or finds orientation, communication equipment place and give away one's position.Improve radio communication performance, improve its antijamming capability, become the important topic of military communication technological innovation and development.Preselector for suppress near the unwanted signal the frequency that requires improve a lot, help improving the performance of short-wave receiver.
Traditional shortwave preselector adopts relay as switch control carrying out frequency-selecting, and the switching rate of general signal relay is the mS level, and the area that takes up room is big.Can only narrow ripple frequency hopping, can not wide interval frequency hopping, and frequency-selecting speed is too slow.
The utility model content
The utility model embodiment technical problem to be solved is, a kind of frequency hopping speed shortwave preselector faster is provided.
In order to solve the problems of the technologies described above, the utility model embodiment provides a kind of shortwave preselector, and it is arranged in the receiver, and this receiver has the control device of control shortwave preselector work, and this shortwave preselector comprises:
Control circuit is used to receive the control command that described control device sends over, and calls the data of inner particular centre frequency point according to control command, and the output high-low level is controlled the PIN diode drive circuit;
The PIN diode drive circuit is used for switching under high voltage and low-voltage two states according to himself operating state of the high-low level control of described control circuit output, thereby controls the conducting state of PIN diode capacitor array;
The PIN diode capacitor array is used for the operating state according to described PIN diode drive circuit, and whether conducting also participates in forming resonant tank with resonant circuit the electric capacity in the control PIN diode capacitor array;
Resonant circuit, be used to select the short-wave radio frequency signal, form resonant tank with the electric capacity of conducting in the described PIN diode capacitor array, the useful signal of characteristic frequency point in the described short-wave radio frequency signal is chosen and exports, the unwanted signal of other frequency is curbed.
Particularly, described resonant circuit comprises first resonant circuit and second resonant circuit, in the middle of first resonant circuit and second resonant circuit, be connected with low noise amplifier circuit, described short-wave radio frequency signal is through the first resonant circuit frequency-selecting and export useful signal, this useful signal amplifies through low noise amplifier circuit, and the useful signal after the amplification enters second resonant circuit again and carries out frequency-selecting output.
Described control circuit is a single-chip microcomputer.Described resonant circuit is that magnet ring forms with the coiling of high temperature lacquer envelope curve.
Control device on the described receiver sends to described control circuit with the communication mode of asynchronous serial with control command.
Implement the utility model embodiment, has following beneficial effect: because the utility model adopts the PIN diode drive circuit to drive the conducting state of PIN diode capacitor array, the switching rate of PIN diode is generally all in the uS magnitude, have also in the nS magnitude, make that the frequency-selecting speed of shortwave preselector is faster; And the operating frequency height of PIN diode generally more than 1GHz, helps at shortwave the work of microwave frequency band.
Description of drawings
Fig. 1 is the overall structure schematic diagram of a kind of shortwave preselector of the utility model embodiment;
Fig. 2 is the circuit diagram of resonant circuit among Fig. 1;
Fig. 3 is the circuit diagram of low noise amplifier circuit among Fig. 1;
Fig. 4 is the typical characteristics curve chart of a kind of shortwave preselector of the utility model embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, the utility model is described in further detail below in conjunction with accompanying drawing.
With reference to Fig. 1, the utility model divides designing two portions: a part is digital control part; A part is a radio frequency part.Two parts circuit uses dielectric film to isolate, and adopts the modular construction assembling.Wherein digital control part comprises:
PIN diode drive circuit 2 is used for switching under high voltage and low-voltage two states according to himself operating state of the high-low level control of described control circuit output, thereby controls the conducting state of PIN diode capacitor array;
PIN diode capacitor array 3 is used for the operating state according to described PIN diode drive circuit, and whether conducting also participates in forming resonant tank with resonant circuit the electric capacity in the control PIN diode capacitor array.
Wherein MCU control circuit (single-chip microcomputer STC89C51) is through the computing of in house software, the P1 of single-chip microcomputer, P2, P3 mouth output high-low level, control PIN diode drive circuit, the switching of PIN diode drive circuit control high pressure DC and DC+5V, when the state of PIN diode drive circuit works at high pressure, the PIN diode in the PIN diode capacitor array is anti-state partially, and the electric capacity on this road does not participate in resonance; When the state of PIN diode drive circuit works at DC+5V, the PIN diode in the PIN diode capacitor array is conducting state, and this moment, the electric capacity on this road was formed the LC resonant tank with resonant inductance.Resonance is a certain definite center frequency points in 200～250 in the 2-30MHz working frequency range.
Serial Control refers to receiver is controlled preselector in the mode of asynchronous serial communication mode of operation.Certainly preselector can adopt any communication work mode as required.The communication mode of this shortwave preselector is: asynchronous serial communication; Data format is: 1 start bit, 8 bit data positions, 1 position of rest, no parity check position, 4800 baud rates; Frame format is: 0x0A (frame origin identification), N byte data position, 0x0D (frame stops sign); Frame title: F frequency configuration;
Receive frequency data: 0AH+F+D0+D1+D2+D3+0DH; D0～D3 is followed successively by the 1MHz position, 10MHz position of frequency, 100KHz position, the ASCII character of 10KHz position.
Wherein radio frequency part comprises:
First resonant circuit 41 and second resonant circuit 42 (circuit diagram is with reference to figure 2), in the middle of first resonant circuit 41 and second resonant circuit 42, be connected with low noise amplifier circuit 5 (circuit diagram is with reference to figure 3), described short-wave radio frequency signal is through 41 frequency-selectings of first resonant circuit and export useful signal, this useful signal amplifies through low noise amplifier circuit 5, and the useful signal after the amplification enters second resonant circuit 42 again and carries out frequency-selecting output. Resonant circuit 41 and 42 all adopts three kinds of the serial magnet ring T-20-6 of the T of AMIDON company, T-30-6, T-37-6, forms with the coiling of high temperature lacquer envelope curve.Magnet ring and PIN diode capacitor array are formed the LC resonant tank, and useful signal is carried out frequency-selecting.Because the sensitivity of receiver is very high, interference signal needs very high inhibition to external world, adopts single-stage LC resonant tank, and selectivity is not high during resonance, and the interference free performance of interference signal is not strong to external world.This shortwave preselector adopts two-stage LC rf resonant circuit.
The workflow of shortwave preselector of the present utility model is as follows:
When receiver receives signal (as 2MHz Frequency point channel time signal), receiver is given the shortwave preselector with the communication mode sending controling instruction of asynchronous serial, when the shortwave preselector receives the data (D0～D3 is the data of 2MHz center frequency points) of ' 0AH+F+D0+D1+D2+D3+0DH ', at first the MCU control unit of shortwave preselector judges whether to be normal communication mode and data format, as the calculation process of normally then passing through in house software, call the data of inner 2MHz center frequency points, export each I/O mouth of MCU control unit to the form of level, the high-low level control PIN diode drive circuit of each I/O mouth of MCU, the switching of PIN diode drive circuit control high pressure DC and DC+5V, when the state of PIN diode drive circuit works at high pressure, PIN diode in the PIN diode capacitor array is anti-state partially, and the electric capacity on this road does not participate in resonance; When the state of PIN diode drive circuit works at DC+5V, the PIN diode in the PIN diode capacitor array is conducting state, and this moment, the electric capacity on this road was formed the LC resonant tank with resonant inductance.Resonance is in the center frequency points of 2MHz.Useful signal to 2MHz Frequency point channel carries out gating, to the unwanted signal inhibition of 2MHz Frequency point channel.The small-signal of antenna is through preselector prime resonant tank, it at first is the frequency-selecting of useful signal, next is the inhibition to unwanted signal, behind the useful signal process prime resonant tank, entering low noise amplifier circuit amplifies, because the Insertion Loss very faint from the useful signal of antenna and the front and back stages resonant tank brings needs the one-level amplifying circuit to remedy these Insertion Loss.Signal is the signal that amplifies about 10dB through behind the low noise amplifier circuit, and the useful signal after the amplification enters back level LC resonant tank again, carries out frequency-selecting again.Decay again to unwanted signal suppresses.Behind the small-signal process preselector from antenna is that a selectivity can reach 50dBc at off-center frequency ± 10%, overall gain is at-1～3dBm, noise factor is less than 8dB, unwanted signal is had a very high inhibition ability and resonance in 2MHz center frequency points useful signal.
Because the utility model adopts the PIN diode drive circuit to drive the conducting state of PIN diode capacitor array, its switching rate of PIN diode is generally all in the uS magnitude, have also in the nS magnitude, and the operating frequency height of PIN diode, generally more than 1GHz, help at shortwave the work of microwave frequency band.PIN diode depends on the characteristic of Dc bias to the control of radiofrequency signal, and almost irrelevant with the frequency microwave signal amplitude.This mainly is because in the I floor in the transit-time effect of charge carrier and the I district due to the charge storage effect.Under forward bias, the PIN pipe is to the conducting all the time of microwave small-signal.For Microwave Large-Signal, because the little inclined to one side tin of bias current of forward stored a large amount of charge carriers for the I layer, the microwave frequency height in extremely short signal negative half period, still has abundant storage charge carrier to keep this " conducting " state in the I layer, present Low ESR, in contrast, under the back bias voltage in the I layer Charge Storage be bordering on zero, the charge carrier total amount of injecting the I layer in the positive half cycle of microwave signal is limited, be not enough to change the high impedance status of I layer, so PIN diode is in cut-off state.Therefore, PIN diode only depends on the bias characteristic that amplitude is very little to the control of microwave signal, and is irrelevant with the amplitude of microwave signal.And the bias voltage of control PIN diode is by the control of PIN diode drive circuit, the circuit that the PIN diode drive circuit is made up of at the two-forty switch triode of nS magnitude switching rate, and this just makes that the frequency-selecting speed of shortwave preselector is faster.
The utility model is that a kind of (work of 2MHz～30MHz) has low-noise factor, and inband flatness is good, the preselector module of high OIP3 at the HF wave band.Circuit requirement is realized 200～250 step footpath frequency hoppings in working frequency range, and each frequency hopping point must guarantee good electrical quantity index.The utility model adopts the series connection of twin-stage filter, and the centre adds low noise amplifier circuit, as shown in Figure 1.Circuit adopts the double-tuned filter series connection, increases the steepness of filter amplitude-frequency characteristic at low frequency and high frequency, increases the Q value of filter, approaches the response of Butterworth (But-terworth) filter.The single-section filter circuit adopts 6 grades of low passes, the cascade of high pass LC network to realize the narrow band filter function.The twin-stage filter shape is good, and selectivity can reach 50dBc at off-center frequency ± 10%, and overall gain is at-1～3dBm, and noise factor is less than 8dB.Add the electrical performance indexes parameter that low noise amplifier more can improve the cascade filter in the middle of the twin-stage filter: the centre adds low noise amplifier can remedy the Insertion Loss that filter brings, and machine sensitivity is had greatly improved.
As shown in Figure 4, after Receiver Control Unit sends instructions to the preselector module, the preselector module at microsecond order of magnitude interior resonance in the centre frequency identical (the base band centre frequency that promptly has useful signal) with operation of receiver, as we can see from the figure, useful signal has the gain of 0～3dBm when resonance, gain fluctuation is between 0.5dBm in the BW3 bandwidth, basically not decay, the useful signal passband fluctuation is little, decay at off-center frequency ± 10% is better than 65dBc, and far-end suppresses to be better than 75dB.This explanation preselector module is very big near the decay of the unwanted signal the useful signal (local interference signal), and near unwanted signal (local interference signal) is suppressed very strong, has effectively strengthened the antijamming capability in radio station.And low noise amplifier circuit remedies the gain of useful signal, makes useful signal undamped or decay is very little, and machine sensitivity is had greatly improved and improves.
Above disclosed only is a kind of preferred embodiment of the utility model, can not limit the interest field of the utility model certainly with this, and therefore the equivalent variations of being done according to the utility model claim still belongs to the scope that the utility model is contained.
Claims (5)
1. shortwave preselector, it is arranged in the receiver, and this receiver has the control device of control shortwave preselector work, it is characterized in that this shortwave preselector comprises:
Control circuit is used to receive the control command that described control device sends over, and calls the data of inner particular centre frequency point according to control command, and the output high-low level is controlled the PIN diode drive circuit;
The PIN diode drive circuit is used for switching under high voltage and low-voltage two states according to himself operating state of the high-low level control of described control circuit output, thereby controls the conducting state of PIN diode capacitor array;
The PIN diode capacitor array is used for the operating state according to described PIN diode drive circuit, and whether conducting also participates in forming resonant tank with resonant circuit the electric capacity in the control PIN diode capacitor array;
Resonant circuit, be used to select the short-wave radio frequency signal, form resonant tank with the electric capacity of conducting in the described PIN diode capacitor array, the useful signal of characteristic frequency point in the described short-wave radio frequency signal is chosen and exports, the unwanted signal of other frequency is curbed.
2. shortwave preselector as claimed in claim 1, it is characterized in that, described resonant circuit comprises first resonant circuit and second resonant circuit, in the middle of first resonant circuit and second resonant circuit, be connected with low noise amplifier circuit, described short-wave radio frequency signal is through the first resonant circuit frequency-selecting and export useful signal, this useful signal amplifies through low noise amplifier circuit, and the useful signal after the amplification enters second resonant circuit again and carries out frequency-selecting output.
3. shortwave preselector as claimed in claim 2 is characterized in that described control circuit is a single-chip microcomputer.
4. shortwave preselector as claimed in claim 2 is characterized in that, described resonant circuit is that magnet ring forms with the coiling of high temperature lacquer envelope curve.
5. shortwave preselector as claimed in claim 4 is characterized in that, the control device on the described receiver sends to described control circuit with the communication mode of asynchronous serial with control command.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920058685XU CN201436788U (en) | 2009-06-17 | 2009-06-17 | Short wave preselector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920058685XU CN201436788U (en) | 2009-06-17 | 2009-06-17 | Short wave preselector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201436788U true CN201436788U (en) | 2010-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920058685XU Expired - Fee Related CN201436788U (en) | 2009-06-17 | 2009-06-17 | Short wave preselector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510269A (en) * | 2011-11-09 | 2012-06-20 | 广东圣大电子有限公司 | Small short-wave preselector |
-
2009
- 2009-06-17 CN CN200920058685XU patent/CN201436788U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510269A (en) * | 2011-11-09 | 2012-06-20 | 广东圣大电子有限公司 | Small short-wave preselector |
| CN102510269B (en) * | 2011-11-09 | 2014-12-17 | 广东圣大电子有限公司 | Small short-wave preselector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: GUANGDONG SHENGDA ELECTRONIC CO., LTD. Free format text: FORMER OWNER: GUANGZHOU SHENGDA ELECTRONIC CO., LTD. Effective date: 20130724 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 510430 GUANGZHOU, GUANGDONG PROVINCE TO: 528308 FOSHAN, GUANGDONG PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20130724 Address after: 528308 Guangdong Province, Foshan city Shunde District Lunjiao Lunjiao Street Office of the new industrial zone of Xi four northbound Santa Industrial Park Administration building five floor Patentee after: Guangdong Shengda Electronic Co., Ltd. Address before: Shijing Town, Baiyun District of Guangzhou City, Guangdong province 510430 Qingfeng third industrial zone 7 Patentee before: Guangzhou Shengda Electronic Co., Ltd. |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100407 Termination date: 20130617 |