CN113381521A - Rowland C transmitter main circuit with forward voltage synthesis - Google Patents
Rowland C transmitter main circuit with forward voltage synthesis Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The invention provides a main circuit of a Rowland C transmitter for synthesizing forward voltage, which comprises a power amplifier module, a back edge circuit, a resonant network and a power amplifier power supply, wherein the power amplifier power supply provides working voltage for the power amplifier module and the back edge circuit; the power amplification module adopts a D-type power amplifier to convert the direct-current voltage output by the power amplification power supply into alternating-current square wave voltage with the Rowland C working frequency; the back edge circuit is connected with the power amplification module and connected with the resonant network to generate a Rowland C current back edge; the resonant network completes tuning filtering with the transmitting antenna, and vibrates the synthesized forward voltage to generate standard Rowland C current. The invention has the advantages of high transmission efficiency, less synthesis period, simple phase control, easy engineering realization and the like, can effectively reduce the voltage output, synthesis and control periods of the Rowland C transmitter, reduces the participation quantity of power amplifier modules and reduces the cost of the transmitter.
Description
Technical Field
The invention relates to the field of low-frequency high-power transmission, in particular to a main circuit of a Roland C transmitter, which is used for transmitting Roland C signals.
Background
The Rowland C system is a land-based remote radio navigation system, and has high repeated positioning precision, strong anti-interference capability and all-weather continuous positioning capability. The Rowland C system mainly comprises an operation control center, transmitting stations, a monitoring station, a differential station and a time service user, wherein three or more transmitting stations form a station chain, the working frequency of each transmitting station is 100kHz, timing pulse signals coded by fixed phases are transmitted, each group of the main station transmits nine pulses, each group of the secondary stations transmits eight pulses, and the timing pulses between each secondary station and the main station have fixed time delay difference. And receiving signals of the Rowland C station of different transmitting stations in the station chain at a certain point in the working area, calculating the time difference of the different stations reaching the receiving point, and converting the time difference into the distance difference by using the principle of stable radio wave propagation speed so as to solve the position information of the receiving point.
The loran C system has been widely used in the eighties and ninety years of the last century as a representative of land-based remote navigation systems, and countries in the world where the loran C system was once owned are mainly the united states, russia, norway, france, germany, uk, korea, japan, china, and the like. More than 60 launching stations are deployed around the world before 2010, more than 20 station chains are counted, the working area almost covers the whole northern hemisphere, and most military aircrafts and ships are equipped with Rowland navigators. The system is the only national infrastructure and strategic resource which can independently provide perfect PNT (navigation, positioning and time service) information besides satellite navigation, and is the best backup and supplement means of the satellite navigation system.
The Rowland C transmitter is an important part of signal transmission, power generation and waveform formation of the Rowland C system, and the performance of the Rowland C transmitter directly influences the coverage range and navigation, positioning and time service precision of the system. The traditional Rowland C transmitter is based on a magnetic pulse compression principle, synthesizes 4 half-cycle currents into a high-power current waveform, generates a standard Rowland C current waveform by impacting a rear-end tuning network to vibrate, is limited by the performances of devices such as a charging capacitor, a silicon controlled rectifier and a magnetic pulser, and has low transmission efficiency; the Rowland C transmitter with the full-period voltage synthesis forms 25 periods of high-power voltage waveforms through positive voltage and negative voltage synthesis, standard Rowland C current waveforms are generated through shock of a tuning network at the rear end, the Rowland C transmitter with the full-period voltage synthesis has more voltage synthesis periods and complicated phase control, the accurate control of full-period phases is not easy to realize, and the high-power engineering is difficult to realize.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a main circuit of a Roland C transmitter for forward voltage synthesis, which can improve the transmission efficiency, shorten the synthesis period and realize high-power engineering.
The technical scheme adopted by the invention for solving the technical problems is as follows: a main circuit of a Rowland C transmitter with forward voltage synthesis comprises a power amplifier module, a back edge circuit, a resonant network and a power amplifier power supply.
The power amplifier power supply provides working voltage for the power amplifier module and the back edge circuit; the power amplification module adopts a D-type power amplifier to convert the direct-current voltage output by the power amplification power supply into alternating-current square wave voltage with the Rowland C working frequency; the back edge circuit is connected with the power amplification module and connected with the resonant network to generate a Rowland C current back edge; the resonant network completes tuning filtering with the transmitting antenna, and vibrates the synthesized forward voltage to generate standard Rowland C current.
The power amplifier module comprises a full-bridge circuit and a transformer, wherein the input end of the full-bridge circuit is connected with a power amplifier power supply and is alternatively switched on and off according to the working frequency of Rowland C, the input direct-current voltage of the power amplifier power supply is converted into alternating-current square wave voltage, the output end of the full-bridge circuit is connected with the transformer, and the alternating-current square wave voltage is output to the back edge circuit through the transformer.
The power amplifier module generates a forward voltage waveform, a rear edge circuit is not connected with a resistor in the circuit before a Rowland C current envelope peak point, and the resonant network and the transmitting antenna generate a Rowland C current front edge; the back edge circuit is connected with a resistor R1 at a peak point and is connected with a resistor R2 at a voltage envelope zero crossing point, the power amplification module stops outputting voltage, and a Rowland C current back edge is generated through the resonant network and the transmitting antenna.
The resistor R1 is a transmitting antenna equivalent resistor R0, and the resistor R2 is the product of the transmitting antenna equivalent resistor R0 and an attenuation scale factor K; the attenuation scale factor K is the ratio of the number of negative voltage pulses to the number of positive voltage pulses in the full-period voltage.
The invention has the beneficial effects that:
(1) the main circuit of the Roland C transmitter synthesized by the forward voltage only needs to generate forward voltage with less cycles, and has the advantages of high transmission efficiency, less synthesis cycles, simple phase control, easy engineering realization and the like.
(2) The invention solves the problem of low transmitting efficiency of the traditional Rowland C transmitter which adopts a magnetic pulser to carry out pulse compression.
(3) The invention solves the problems that the voltage synthesis period of the Roland C transmitter synthesized by full-period voltage is more, the phase control is fussy and the engineering realization is not easy.
(4) The transmitter main circuit of the invention is added with the back edge circuit on the basis of the traditional transmitter main circuit, and the back edge circuit forms the Rowland C current back edge by absorbing the energy of the resonant network, thereby effectively reducing the voltage output, synthesis and control periods of the Rowland C transmitter, reducing the participation quantity of power amplifier modules and reducing the cost of the transmitter.
Drawings
FIG. 1 is a schematic diagram of the main circuit components of a Rowland C transmitter for forward voltage synthesis;
FIG. 2 is a graph of a standard Rowland C current waveform;
fig. 3 is an exploded schematic view of a power amplifier module;
FIG. 4 is a back edge circuit exploded schematic;
FIG. 5 is a schematic diagram of forward voltage;
FIG. 6 is a full cycle voltage schematic;
FIG. 7 is an exploded schematic view of a tuning network;
FIG. 8 is a schematic diagram of an equivalent circuit of a transmit antenna;
FIG. 9 is a simulation plot of forward voltage versus standard Rowland C current waveforms.
Detailed Description
The present invention will be further described with reference to the following drawings and examples, which include, but are not limited to, the following examples.
The invention provides a main circuit of a Rowland C transmitter with forward voltage synthesis, which comprises a power amplifier module, a back edge circuit, a resonant network and a power amplifier power supply. The power amplifier module adopts a D-type power amplifier, the conversion efficiency can reach 98 percent, and the problem of low transmitting efficiency of the traditional Rowland C transmitter can be solved; the power amplifier module stops outputting power at the moment when the transmitter outputs a voltage envelope zero-crossing point, the rear edge circuit is respectively connected with the resistors in the circuit at the Rowland C current envelope peak point (65 mu s) and the voltage envelope zero-crossing point, the Rowland C current attenuation is accelerated, and a transmitter main circuit forms a Rowland C current waveform. The problems that the voltage synthesis period of a Roland C transmitter synthesized by full-period voltage is large and phase control is complicated are solved, and engineering realization is easy.
The main circuit of the Rowland C transmitter with synthesized forward voltage provided by the invention is shown in figure 1, wherein 100 is a power amplifier power supply, 101 is a power amplifier module, 102 is a back edge circuit, 103 is a resonant network, and 104 is a transmitting antenna. The power amplifier power supply provides working voltage for the power amplifier module and the back edge circuit, and the power amplifier module converts the direct-current voltage output by the power amplifier power supply into alternating-current square wave voltage with the Loran C working frequency of 100 kHz; the input end of the back edge circuit is connected with the power amplifier module, and the output end of the back edge circuit is connected with the resonant network to generate a Rowland C current back edge; the resonant network completes the tuning filtering with the transmitting antenna, and oscillates the synthesized forward voltage to generate a standard rowland C current, as shown in fig. 2.
The power amplification module is composed of a full-bridge circuit and a transformer, as shown in fig. 3, wherein the input end of the full-bridge circuit is connected with a power amplification power supply and is alternatively switched on and off according to the frequency of 100kHz, the direct-current voltage input by the power amplification power supply is converted into the alternating-current square wave voltage of plus and minus 5 microseconds, the output end of the full-bridge circuit is connected with the transformer, and the alternating-current square wave voltage is output to the back edge circuit through the transformer.
The back edge circuit consists of a silicon controlled radio frequency switch, a resistor R1 and a resistor R2, as shown in figure 4, the resistors in the circuit are respectively connected at the time (65 mus) of the Rowland C current envelope peak point and the time of the voltage envelope zero crossing point, so that the energy absorption of the resonant network is realized, and the Rowland C current back edge is formed; the resistor R1 is a transmitting antenna equivalent resistor R0, and the resistor R2 is the product of the transmitting antenna equivalent resistor R0 and the attenuation scale factor K.
The attenuation scale factor K is the ratio of the number of negative voltage pulses to the number of positive voltage pulses in the full-period voltage.
The resonant network consists of an adjustable inductor and a resonant capacitor, the motor controls the sliding block H to slide to adjust the inductance value of the inductor, and the slider is connected to the resonant capacitor through a lead D1, so that the inductor and the capacitor are tuned to the Rowland C working frequency of 100 KHz.
The motor is an electromagnetic device for realizing electric energy conversion or transmission according to the electromagnetic induction law, and the motor mainly has the function of driving torque and is used as a power source of electric appliances or various machines.
The transmitting antenna equivalent circuit is formed by connecting an equivalent inductor L0, an equivalent capacitor C0 and an equivalent resistor R0 in series, the power amplifier power supply can output adjustable direct-current voltage of 100V-400V, and the specific technical scheme and physical composition of the transmitting antenna and the power amplifier power supply are embodied in other patents.
The main circuit of the forward voltage synthesis Rowland C transmitter provided by the invention generates a forward voltage waveform through a power amplifier module, a back edge circuit is not connected with a resistor in the circuit before a Rowland C current envelope peak point (65 mu s), and a resonant network and a transmitting antenna generate a Rowland C current front edge; the back edge circuit is connected with a resistor R1 at a peak point, is connected with a resistor R2 at a voltage envelope zero crossing point, the power amplification module stops outputting voltage, and at the moment, a Rowland C current back edge is generated through the resonant network and the transmitting antenna. Finally, a standard Rowland C current waveform is formed on the transmitting antenna and radiated.
Wherein, the forward voltage is that the power amplifier module outputs voltage to the rear end, and the whole main transmitting circuit only has positive voltage, as shown in fig. 5; in addition to the positive voltage, the loran C transmitting circuit with the full-period voltage synthesis also has a negative voltage, as shown in fig. 6, the negative voltage refers to a power amplifier module whose voltage is output from the rear-end resonant network to the front end.
Wherein the standard Rowland C current waveform function is:
i(t)＝t2e-atsin(0.2πt+φ0) (1)
whereinA is an attenuation constant, and the value a is generally 2/65;
the value is 0 or pi for phase encoding.
The forward voltage waveform function is:
v0(t)＝0(t≥t1)
t1the voltage envelope zero crossing time.
The voltage envelope zero-crossing point moment is a moment when the positive voltage changes into the negative voltage.
The function of the attenuation scaling factor K is:
N-: number of negative voltage pulses, N+: number of forward voltage pulses.
The resistor R1 is: r1 ═ R0, and R0 is the equivalent resistance of the transmitting antenna.
The resistor R2 is: r2 ═ R1 × K, K being the attenuation scale factor.
The embodiment of the invention is shown in fig. 1, and the main transmitting circuit comprises a power amplifier power supply 100, a power amplifier module 101, a back-edge circuit 102, a resonant network 103 and a transmitting antenna 104. Specifically, the power amplifier power supply 100 provides high-voltage direct-current voltage required by work for the power amplifier module 101, and provides energy for the motor work of the resonant network 103; the power amplifier module 101 converts the input direct current voltage into alternating current square wave voltage with 5 mu cycles through the alternate on and off of 5 mu cycles, and the transmitter superposes and synthesizes the voltage waveform required by the forward voltage waveform function through the different working numbers of each cycle of the plurality of power amplifier modules; the back edge circuit 102 is respectively connected to a transmitter main circuit at a current envelope peak point (65 mu s) and a voltage envelope zero-crossing point, and participates in energy absorption of the resonant network to accelerate the waveform attenuation of current; the resonant network 103 and the transmitting antenna 104 are tuned at 100KHz, and the input voltage waveform is subjected to shock oscillation to generate a standard rowland C current as shown in fig. 2, and the current is transmitted through the antenna.
Specifically, in fig. 3, four field effect transistors Q1 to Q4 form a full bridge circuit, wherein Q1 and Q3, Q2 and Q4 are sequentially switched on and off alternately at a frequency of 100kHz, and an input direct current voltage is converted into an alternating current square wave voltage of plus and minus 5 μ s and output through a transformer T. In fig. 4, the scr rf switches K1 and K2 are in an open circuit state before the peak point (65 μ s) of the current envelope of rowland C, at this time, the trailing edge circuit 102 is not connected to the transmitter main circuit, the power amplifier module 101 and the resonant network 103 are in a direct connection state, and the voltage v is set to be v0(t) generating a rowland C current front through the resonant network 103 and the transmit antenna 104; the trailing edge circuit 102 is switched on at the moment of 65 mus when the K1 is switched on, the K2 is switched off, the resistor R1 is connected to the main circuit of the transmitter, and at the moment, the resistor R1 absorbs network energy to enable the Rowland C current envelope waveform to start to descend from a peak point; after the zero-crossing time of the voltage envelope, K1 is cut off, K2 is switched on, a resistor R2 is connected to a transmitter main circuit, and a resistor R2 absorbs network energy to enable the Rowland C current envelope waveform to rapidly drop, so that the Rowland C current trailing edge is generated.
The tuning network shown in fig. 7 is composed of an adjustable inductor and a resonant capacitor, and the tuning network is connected in series with the transmitting antenna, wherein the transmitting antenna with a working frequency of 100kHz has a large capacitive reactance and an equivalent circuit is capacitive, and the tuning network and the transmitting antenna are integrally tuned in series at the working frequency of 100kHz by adjusting the adjustable inductor of the tuning network to match the equivalent circuit of the transmitting antenna; specifically, the motor controls the sliding piece H to slide, the inductance of the inductor L1 of the access circuit changes along with the sliding piece H, until the sum of the inductance of the inductor L1 and the inductance of the inductor L0 and the capacitance C0 are accurately tuned on the frequency of 100kHz, namely the following conditions are met:
the resonant capacitor C1 of the tuning network is matched with the leakage inductance of the power amplifier module transformer T, and the capacitance of C1 and the leakage inductance of the transformer T are accurately tuned on the frequency of 100 kHz.
The following examples are given by way of illustration and are not intended to limit the scope of the invention. The equivalent inductance L0 of the transmitting antenna is 240uH, the equivalent capacitance C0 is 8.6nF, the equivalent resistance R0 is 2.0 Ω, and the input dc voltage of the power amplifier module is 100V. Calculating the number of cycles of the forward voltage to be 8 according to the forward voltage waveform function (2), namely the time t of the zero crossing point of the voltage envelope180 μ s, as shown in FIG. 5; the corresponding negative voltage cycle number is 17, and as shown in fig. 6, K is calculated as 17/8 as a function of the attenuation scale factor K.
Under the conditions of the embodiment, the number of the cycles of the forward voltage output by the power amplifier module 101 is 8, and the number ratio of the power amplifier modules participating in the work in each cycle is 8:13:15:12:9:6:3: 1; in the trailing edge circuit, R1 and R2 are R1 ═ R0 ═ 2.0 Ω, and R2 ═ R0 × K ═ 4.25 Ω. As can be seen from the simulation diagram of the forward voltage and the standard rowland C current waveform shown in fig. 9, the power amplifier module inputs 100V of dc voltage, outputs 8 cycles of 10 μ s of forward voltage, and R1 and R2 in the trailing edge circuit are connected to the circuit at 65 μ s and 80 μ s respectively, so that the standard rowland C current waveform can be formed on the transmitting antenna.
Claims (4)
1. A Rowland C transmitter main circuit with forward voltage synthesis comprises a power amplifier module, a back edge circuit, a resonant network and a power amplifier power supply, and is characterized in that the power amplifier power supply provides working voltage for the power amplifier module and the back edge circuit; the power amplification module adopts a D-type power amplifier to convert the direct-current voltage output by the power amplification power supply into alternating-current square wave voltage with the Rowland C working frequency; the back edge circuit is connected with the power amplification module and connected with the resonant network to generate a Rowland C current back edge; the resonant network completes tuning filtering with the transmitting antenna, and vibrates the synthesized forward voltage to generate standard Rowland C current.
2. The main circuit of the forward voltage synthesized Rowland C transmitter of claim 1, wherein the power amplifier module comprises a full-bridge circuit and a transformer, the input end of the full-bridge circuit is connected to the power amplifier power supply and is alternatively turned on and off according to the working frequency of Rowland C to convert the input DC voltage of the power amplifier power supply into AC square wave voltage, and the output end of the full-bridge circuit is connected to the transformer to output the AC square wave voltage to the back-edge circuit through the transformer.
3. The main circuit of the forward voltage synthesized Rowland C transmitter of claim 1, wherein the power amplifier module generates a forward voltage waveform, the back edge circuit is not connected to a resistor in the circuit before a Rowland C current envelope peak point, and the resonant network and the transmitting antenna generate a Rowland C current front edge; the back edge circuit is connected with a resistor R1 at a peak point and is connected with a resistor R2 at a voltage envelope zero crossing point, the power amplification module stops outputting voltage, and a Rowland C current back edge is generated through the resonant network and the transmitting antenna.
4. The main circuit of forward voltage synthesized Rowland C transmitter as claimed in claim 2, wherein said resistor R1 is a transmission antenna equivalent resistor R0, and said resistor R2 is a product of a transmission antenna equivalent resistor R0 and an attenuation scale factor K; the attenuation scale factor K is the ratio of the number of negative voltage pulses to the number of positive voltage pulses in the full-period voltage.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4104635A (en) * | 1976-11-12 | 1978-08-01 | Sanders Associates, Inc. | LORAN-C navigation apparatus |
| CN1502046A (en) * | 2001-04-11 | 2004-06-02 | Radio wave pulse train navigation systems | |
| CN107294548A (en) * | 2017-06-06 | 2017-10-24 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | A kind of LoranC system emitter main circuit and its transmitted waveform generation method |
| CN107332574A (en) * | 2017-08-11 | 2017-11-07 | 北京北广科技股份有限公司 | A kind of high-power Loran-C pulse emitter and its waveform modulated method |
| CN111600619A (en) * | 2020-03-30 | 2020-08-28 | 中山大学 | Rowland C signal generation method, device, equipment and storage medium |
| CN111654296A (en) * | 2020-06-28 | 2020-09-11 | 中国电子科技集团公司第二十研究所 | High-power Rowland C waveform synthesis method |
-
2021
- 2021-06-14 CN CN202110657726.2A patent/CN113381521A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4104635A (en) * | 1976-11-12 | 1978-08-01 | Sanders Associates, Inc. | LORAN-C navigation apparatus |
| CN1502046A (en) * | 2001-04-11 | 2004-06-02 | Radio wave pulse train navigation systems | |
| CN107294548A (en) * | 2017-06-06 | 2017-10-24 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | A kind of LoranC system emitter main circuit and its transmitted waveform generation method |
| CN107332574A (en) * | 2017-08-11 | 2017-11-07 | 北京北广科技股份有限公司 | A kind of high-power Loran-C pulse emitter and its waveform modulated method |
| CN111600619A (en) * | 2020-03-30 | 2020-08-28 | 中山大学 | Rowland C signal generation method, device, equipment and storage medium |
| CN111654296A (en) * | 2020-06-28 | 2020-09-11 | 中国电子科技集团公司第二十研究所 | High-power Rowland C waveform synthesis method |
Non-Patent Citations (1)
| Title |
|---|
| 许奎等: "基于全周期电压合成的罗兰C 发射机技术研究", 《现代导航》, no. 1, pages 32 - 36 * |
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