228 results about "Frequency synthesis" patented technology

The invention discloses a high-precision delay synchronization system with a phase jitter compensation function. The high-precision delay synchronization system comprises an upper computer, an external trigger module, a time reference module, a master control ZYNQ module, a frequency synthesis and trigger mode selection module, a jitter compensation module, a precise delay circuit and an output signal conditioning circuit. According to the invention, the pulse output with adjustable delay time, amplitude and polarity can be realized, the high-precision delay synchronization of signals is realized, and the stability is higher.

The invention discloses an arbitrary digital signal synthesis method and system. The method comprises the following steps: analyzing a target parameter of a digital signal to be synthesized; generating a first multi-path baseband waveform by using a digital direct frequency synthesizer according to a modulation rate parameter in the target parameters, and reading pre-stored noise data to generate a second multi-path baseband waveform; selecting a plurality of appointed baseband waveforms, and modulating the plurality of baseband waveforms by using carrier frequency and bandwidth parameters in target parameters to obtain a plurality of instantaneous frequency curves; and integrating the multiple instantaneous frequency curves to obtain a phase stepping curve of each path, selecting a phase modulation curve according to a phase modulation type in the target parameters, and performing digital direct frequency synthesis on the phase stepping curve and the phase modulation curve of each path to generate multiple parallel digital synthesis signals. According to the invention, the synthesis process of the digital signals of different modulation types is uniformly decomposed, so that the coupling degree of the module and the complexity of the system are greatly reduced, and meanwhile, the resource consumption is reduced.

The embodiment of the invention provides a broadband signal dynamic generation method and system based on multiple clock sources, and the method comprises the steps: monitoring a target frequency in real time through a field programmable gate array, and automatically switching to a corresponding target clock source based on a frequency band to which the target frequency belongs; correcting the phase difference corresponding to the new and old target clock sources through a phase compensation register when the target clock sources are switched, and loading a compensation value to a phase offset register of a direct digital frequency synthesis chip; a fundamental waveform of a broadband signal is generated based on a direct digital frequency synthesis chip, multiple harmonic components are superposed through a fractional accumulation method, and each harmonic amplitude is independently controlled through a look-up table method; an output signal of the power amplifier is collected through the analog-to-digital converter, error information of the actually measured waveform and the theoretical waveform is extracted, the phase offset register and the harmonic amplitude look-up table coefficient are dynamically corrected, and a target broadband signal is output. Unification of broadband coverage, high resolution and quick response is realized.

The invention discloses a terahertz wave signal transmission method and system based on a superheterodyne structure in the technical field of millimeter wave and terahertz wireless communication, and the method comprises a processing method of a transmitted signal and a processing method of a received signal. The transmitting signal processing method comprises the following steps: converting a baseband signal into a plurality of sub-intermediate-frequency signals through a plurality of intermediate-frequency sub-modules in an intermediate-frequency module; synthesizing the plurality of sub-intermediate-frequency signals into a broadband intermediate-frequency signal by using a power combiner, and feeding the broadband intermediate-frequency signal into a radio frequency module; the radio frequency module converts the broadband intermediate frequency signal into a terahertz wave radio frequency signal; the received signal processing method comprises the following steps: the radio frequency module converts a received terahertz wave radio frequency signal into a broadband intermediate frequency signal; dividing the broadband intermediate-frequency signal into a plurality of sub-intermediate-frequency signals by using a power divider; and respectively restoring the sub-intermediate-frequency signals into baseband signals through a plurality of intermediate-frequency sub-modules in the intermediate-frequency module. By optimizing the frequency synthesis and distribution of the signals, the transmission rate and the system capacity of the terahertz wave signals are improved.

The invention belongs to the technical field of near-field imaging, and particularly relates to a microwave and millimeter wave near-field subsurface microscopic imaging device and method based on signal interference, and the device comprises a vector network analyzer, a signal separation device, a phase adjustment device, a semi-steel coaxial line, a displacement platform, and an industrial control computer. The vector network analyzer comprises a signal separation unit, a frequency synthesis source, a first receiver and a second receiver, wherein the frequency synthesis source, the first receiver and the second receiver are respectively connected with the signal separation unit and used for generating microwave and millimeter wave test signals. The signal separation device is respectively connected with the vector network analyzer, the phase adjusting device and the semi-steel coaxial line, and the displacement table is connected with the vector network analyzer through the industrial personal computer; the tail end of the semi-steel coaxial line, which is far away from the signal separation device, is provided with a conical needle tip-shaped near-field probe; and the needle tip of the near-field probe is vertical to the surface of a to-be-detected sample arranged on the displacement table.

The invention designs a broadband intermediate-frequency heterogeneous integrated communication transceiving micro module and a three-dimensional packaging method, and belongs to the technical field of advanced packaging. The micro module comprises a TSV silicon adapter plate, a Fan-out module, an HTCC ceramic substrate and a digital chip. The TSV silicon adapter plate adopts a high-resistance silicon substrate, and a coaxial shielding TSV structure is arranged on the TSV silicon adapter plate and comprises an inner layer signal through hole and an outer layer grounding layer. A frequency synthesizer chip and a radio frequency chip are embedded in the Fan-out module, and high-density horizontal interconnection is realized through a plurality of redistribution layers. The HTCC ceramic substrate is of a multi-layer laminated structure, and an impedance matching network is arranged in the HTCC ceramic substrate. The three-dimensional packaging method comprises the steps of TSV silicon adapter plate preparation, Fan-out module processing, digital chip stacking and system-level integration. High-density packaging of the radio frequency chip and the digital chip is achieved through the three-dimensional heterogeneous integrated architecture, and low-loss transmission of broadband signals is guaranteed through the coaxial shielding TSV structure and the impedance matching network.

The present invention relates to a simple VHF frequency band channel transceiver, belonging to the technical field of very high frequency transceivers. It is composed of a device box and a circuit board. The device box is composed of a shell, a cover plate and a shielding cavity. The receiving / transmitting channel module installed on the circuit board contains a receiving circuit, a transmitting circuit and a power supply circuit; the receiving circuit is composed of a low-noise amplifier frequency selection, mixing, intermediate frequency amplification, intermediate frequency crystal filtering, automatic gain control, receiving demodulation and receiving frequency synthesis circuit; the transmitting circuit is composed of a transmitting frequency synthesis, a transmitting pre-stage drive amplifier, a transmitting post-stage drive amplifier and a power detection circuit; a plurality of shielding cavities are milled in the shell and the cover plate, and the shielding cavities are respectively equipped with individual module circuits of the receiving circuit and the transmitting circuit, and the shell and the cover plate are sealed and shielded for the circuit board. The integrated design of the transceiver channel machine and the radio frequency carrier 4FSK digital signal modulation are realized. The receiving intermediate frequency, image frequency, intermodulation and spurious response indicators are excellent, the multi-channel operation has no crosstalk, the analog sensitivity is high, the volume is small, the noise is small, the harmonic spurious suppression is high, and the receiving dynamic range is large.

The invention discloses a broadband current transformer testing method, device and equipment and a medium, and relates to the technical field of transformer verification. First, first frequency signals of standard current and current to be measured are synchronously obtained, the frequency of the signal to be measured is tracked in real time through a high-speed comparator, and a second frequency signal is accurately generated through the digital frequency synthesis technology. The method comprises the following steps: firstly using a high-order digital filter to measure a broadband signal frequency spectrum, then using an analog mixing technology to shift the signal frequency spectrum, generating a composite signal containing a difference frequency component and a sum frequency component, finally accurately filtering the sum frequency component through the high-order digital filter, and only measuring the difference frequency signal to obtain a ratio error and an angular error of the broadband signal. By converting the measurement of the broadband signal into the measurement of the fixed low-frequency signal, the technical bottleneck of direct sampling in a high-frequency band in the traditional sampling technology is broken through, and the actual measurement ratio error and angular error precision of the broadband current transformer is effectively improved. The system power consumption and the hardware cost are significantly reduced while the measurement precision is ensured, and the reliability and the accuracy of the broadband current transformer test are ensured.

The invention discloses a beat frequency comparison device mediated by an optical frequency comb. The beat frequency comparison device comprises the optical frequency comb, a first frequency stabilized laser, a first beat frequency device, a first frequency mixer, a first high-pass filter, a second frequency stabilized laser, a second beat frequency device, a second frequency mixer, a second high-pass filter, a DDS signal generator, a third frequency mixer and a low-pass filter. Frequency-stabilized lasers output by the first frequency-stabilized laser and the second frequency-stabilized laser and an optical frequency comb output by the optical frequency comb are subjected to beat frequency in the first beat frequency device and the second beat frequency device respectively, and first beat frequency and second beat frequency are obtained; the first beat frequency and the second beat frequency are mixed with the carrier envelope offset frequency of the optical frequency comb, and a first sum frequency and a second sum frequency are filtered out; the first sum frequency obtains a synthetic frequency through direct digital frequency synthesis; the second sum frequency and the synthetic frequency are mixed in the third mixer, and then the difference frequency is filtered out through the low-pass filter. According to the invention, beat frequency comparison of frequency-stabilized lasers with different wavelengths can be realized, and the influence of the stability of the optical frequency comb is avoided.

The invention discloses a fast-locking frequency hopping frequency source based on a phase-locked loop frequency synthesis module and a control method, which are applied to a communication system, and are characterized in that a loop filter module quickly charges a narrow-band loop filter circuit or a broadband loop filter circuit based on a fast-locking instruction and a first processing voltage value to reach a preset voltage value; based on the quick locking instruction and the analog signal, the narrowband loop filter circuit or the broadband loop filter circuit is controlled to quickly lock the first frequency value to obtain a locking result; and if the locking result is that the locking is successful, switching the narrowband loop filter circuit or the broadband loop filter circuit. By implementing the embodiment of the invention, the narrow-band loop filter circuit or the broadband loop filter circuit is controlled to quickly lock the first frequency value to obtain the locking result in the process of quickly charging the narrow-band loop filter circuit or the broadband loop filter circuit to reach the preset voltage value. Therefore, charging and locking are carried out at the same time, the fast locking time is saved, and the communication efficiency is improved.

The invention relates to a small frequency source module with low phase noise, which is applied to the technical field of frequency sources, and comprises a dual-redundancy reference source unit, a dynamic temperature compensation unit, a frequency synthesis unit, an intelligent switching control unit and a structure protection unit, the main reference source module and the standby reference source module both adopt MEMS resonators with the Q value not smaller than 10000, the dynamic temperature compensation unit is used for dynamically adjusting the output frequency of the resonators according to the temperature, and the intelligent switching control unit is used for controlling switching between the main reference source module and the standby reference source module; through collaborative design of the high-Q-value MEMS resonator, dynamic temperature compensation and dual-redundancy intelligent switching, the problems of large size, high phase noise, large temperature drift and low reliability of a traditional frequency source module are solved, miniaturization design is realized, and strict requirements of scenes such as communication equipment and a navigation system on miniaturization can be met.

The invention discloses a baseband signal generator based on a programmable logic device, and relates to the technical field of radars, a method is realized by using programmable logic resources in a universal programmable logic device, after an output frequency is generated, a phase parameter is obtained by calculating and accumulating a phase increment, and the output frequency is output. The phase parameter is used as the query address of the sine and cosine lookup table to query and output the digital baseband signal, and the method of directly reading the pre-stored data from the lookup table greatly reduces the calculation amount, saves the operation time and resources of a processor, and especially in a scene where continuous sine and cosine signals need to be generated at a high speed, greatly improves the calculation efficiency. The response speed of the system can be remarkably improved, the signal processing task with the high real-time requirement is met, the system delay time is shortened, the overall power consumption of the system is reduced, the frequency synthesis chip mounted outside the chip is reduced, and the hardware overhead is reduced.

The invention particularly relates to a reconnaissance load for a light and small unmanned aerial vehicle. The reconnaissance load comprises a broadband receiving antenna, a receiving front end and a signal processing rear end which are connected in sequence, the broadband receiving antenna is used for receiving a space electromagnetic signal; the receiving front end is used for performing front-end processing on the space electromagnetic signal to obtain a corresponding digital signal; the signal processing rear end is used for carrying out signal sorting processing on the digital signals and sending sorted feature data to the signal processing background; the receiving front end is provided with a radio frequency analog digital hybrid integrated microsystem, and a signal amplification module, a secondary frequency conversion module, an intermediate frequency amplification filtering module, a sampling module, a frequency synthesis module and a reference clock are packaged in the receiving front end; the signal amplification module, the secondary frequency conversion module, the intermediate frequency amplification filtering module and the sampling module are connected in sequence; the frequency synthesis module is connected with the reference clock, the sampling module and the secondary frequency conversion module. According to the scheme, the investigation load is light in weight, low in cost, low in power consumption and high in applicability.

The invention provides a quartz crystal microbalance resonant frequency detection system, a control method and a terminal, a direct digital frequency synthesis excitation unit is adopted to generate a frequency sweep excitation signal with a preset frequency range and stepping, and the frequency sweep excitation signal is conditioned by a signal injection and conditioning unit and then injected into a QCM sensor. And then the pure amplitude response detection unit measures and quantifies voltage response amplitudes of the QCM sensor under different excitation frequencies, and the resonant frequency intelligent determination unit determines the resonant frequency of the QCM sensor according to the voltage response amplitudes. According to the invention, a QCM self-oscillation circuit does not need to be designed and debugged, a precise phase detection assembly does not need to be configured, the circuit board layout is simpler, and components are greatly reduced. The QCM resonant frequency can be accurately measured only through efficient amplitude detection, a complex algorithm is avoided, the operational capability requirement and the software development difficulty are reduced, the QCM resonant frequency measuring device has the advantages of being simple in structure, low in cost, easy to integrate and the like, miniaturization and low-power-consumption design can be easily achieved, and the QCM resonant frequency measuring device is suitable for portable and wearable application.

The utility model discloses a broadband low-phase-noise small-step frequency source, which comprises a large step ring and a small step ring, and is characterized in that the large step ring comprises a first power divider, a frequency multiplier, a first frequency mixer, a second power divider, a first voltage-controlled oscillator and a first phase discriminator; and the small step ring comprises a direct digital frequency synthesizer, a second phase discriminator, a second frequency mixer, a third power divider, a loop filter, a second voltage-controlled oscillator and a programmable frequency divider. According to the utility model, a reference signal is divided into three paths of reference signals after being subjected to power division by the first power divider, and the three paths of reference signals are respectively sent to the frequency multiplier, the first phase discriminator and the direct digital frequency synthesizer, so that the homology of the whole circuit is ensured; a broadband low-phase-noise small-stepping signal is generated through multi-stage frequency doubling and phase locking of the large stepping ring and the small stepping ring and a digital frequency synthesis device, and no fractional stray exists, so that the problems that the frequency coverage is not wide enough, the fractional stray exists, and the phase noise is large are solved.

The invention discloses a direct digital synthesis method and system based on a mixed fraction proportion. The method comprises the following steps: determining an integer frequency control word, a numerator frequency control word and a denominator frequency control word based on a target frequency, a sampling frequency and a bit width of a phase accumulator; performing a fractional phase accumulation operation based on the sampling frequency, the molecular frequency control word, and the phase accumulator to generate a carry signal; performing integer phase carry and accumulation operation in parallel with the fractional phase accumulation operation according to the sampling frequency, the integer frequency control word and the phase accumulator to obtain an integer phase value; and acquiring a waveform digital amplitude corresponding to the integer phase value, and performing signal conversion according to the waveform digital amplitude to obtain an amplitude signal corresponding to the target frequency so as to improve the precision of the frequency synthesis signal.

The invention provides a multi-channel microwave signal generation method and system with a fixed initial phase, and the method comprises the steps: responding to a triggering signal received by a high-speed clock synchronization module after a pre-configured synchronous clock signal is inputted to the high-speed clock synchronization module; the high-speed clock synchronization module generates a sampling clock signal and a logic clock signal based on the synchronous clock signal, responds to the logic clock signal and inputs the logic clock signal to the high-speed controller, the high-speed controller generates a signal description word while triggering signal input, responds to the sampling clock signal and inputs the sampling clock signal to the direct digital frequency synthesis module; and the direct digital frequency synthesis module generates an analog fundamental frequency signal required by the multi-channel microwave signal source based on the signal description word, responds to the analog fundamental frequency signal and inputs the analog fundamental frequency signal to the phase-locked loop device, and the phase-locked loop device outputs a final target microwave signal.

The invention discloses an amplitude and phase controllable AC voltage generation method and device. The method comprises the following steps: performing frequency synthesis on a Beidou second pulse signal through a frequency synthesis technology to generate a square wave signal; inputting the square wave signal as a clock into a direct current frequency modulation module to generate three paths of direct current square wave signals with variable frequency; inputting the square wave signal as a clock into an alternating current frequency modulation module to generate three paths of alternating current square wave signals with adjustable frequency; inputting the three paths of direct-current square wave signals into a frequency voltage conversion circuit to output direct-current voltage signals, and inputting the three paths of alternating-current square wave signals into the frequency voltage conversion circuit to output alternating-current voltage signals; and respectively inputting the direct-current voltage signal and the alternating-current voltage signal to two ends of a multiplier to generate amplitude and phase controllable alternating-current voltage.

The invention provides a dynamic phase compensation method based on double DDS modules, and belongs to the technical field of digital frequency synthesis. The invention provides the following technical scheme: 1, a dynamic phase inheritance mechanism: through alternate work of double DDS modules, seamlessly transmitting an integer part and a decimal remainder contained in a phase accumulated value of a main DDS to a standby DDS during switching, and combining a shared clock source and a high-speed multiplexer to ensure phase continuity; 2, remainder compensation closed-loop control is carried out, a remainder accumulator is designed to record truncation errors in real time, FTW is dynamically adjusted through a PID algorithm, and long-term frequency error closed-loop suppression is achieved in combination with feedback of an external frequency meter; 3, according to a dual-mode triggering strategy, time period triggering and phase threshold triggering are supported, switching logic is started when a triggering condition (a fixed period or a phase threshold theta th is set) is met, and the phase accumulated value theta 1 (t) and the remainder epsilon 1 of the DDS1 are transmitted to the DDS2. According to the invention, through dynamic phase synchronization and closed-loop compensation, the problems of DDS phase accumulative errors and switching discontinuity are systematically solved.

The invention provides a flight training simulation method and system capable of quickly simulating an airport environment, and relates to the technical field of civil aviation flight training.A deviation control signal is generated by obtaining real-time position information of a target aircraft and parameter information of a target simulation airport, and a simulation navigation signal is generated by utilizing a program control signal generator based on the signal; and finally, intensity attenuation and frequency synthesis are carried out through the transmitting circuit, and transmitting is carried out through the transmitting antenna. And the target aircraft receives and analyzes the simulation navigation signal to generate navigation information. According to the method, by dynamically adjusting the transmitting power of the signal, the signal is prevented from interfering with other aircrafts, the accurate navigation signal is generated through cooperation of multiple program control signal generators, and high-precision training support is provided. The airport environment can be effectively simulated, the training cost is reduced, and the safety, flexibility and reality sense of flight training are improved.

The invention provides a method for constellation time keeping in a free operation state of a satellite-borne atomic clock, and the method comprises the steps: generating an adjustable second time frequency signal through frequency synthesis based on a first time frequency signal outputted by the satellite-borne atomic clock; comparing and measuring the phase difference between the two and sending the phase difference to an inter-satellite link; through inter-satellite measurement and interaction, obtaining a clock error between the second time frequency signals of all satellites, and converting to obtain a clock error between the first time frequency signals of all satellites; and on the basis, a clock difference parameter between the constellation time and the first time-frequency signal is calculated and converted into a clock difference parameter between the constellation time and the second time-frequency signal, a frequency adjustment parameter is generated through a control algorithm, and the second time-frequency signal is controlled to gradually approach the constellation time. The invention further provides a device for constellation time keeping in the free operation state of the satellite-borne atomic clock. Therefore, the free operation requirement and the irregular frequency modulation requirement of the satellite-borne atomic clock under the navigation constellation autonomous time keeping scene can be considered, and the constellation autonomous time keeping precision and the user service performance are improved.

The invention provides a vehicle-mounted short-wave communication system performance detection system. The system adopts a modular design and mainly comprises a radio frequency power detection module, a spectrum analysis module and an industrial digital processor module. The radio frequency power detection module generates an initial signal through direct digital frequency synthesis, the initial signal enters the frequency division and phase discrimination controller after being processed by the low-pass filter, and frequency synthesis is completed through the voltage-controlled oscillator. And the spectrum analysis module realizes digital signal processing of the high-speed synchronous radio frequency signal. The industrial digital processor module is responsible for overall control and data processing, and supports a wireless communication technology to realize efficient data interaction. The system integrates a multifunctional radio frequency standard signal source and provides support of various modulation modes. The system solves the problems of poor portability, low detection precision, weak anti-interference capability and the like in the prior art, provides a high-precision and high-reliability detection tool for fault diagnosis and performance optimization of a vehicle-mounted short-wave communication system, and has remarkable technical advancement and market application value.

This invention discloses a stable amplitude control system for a high-Q MEMS resonator. This system is a digital closed-loop drive system based on a field programmable gate array (FPGA) as the control platform and DDS-PLL technology as the control scheme. The system uses a digital phase-locked loop (DPS) algorithm for frequency synthesis to track the gyroscope's vibration resonant frequency and phase. This structure utilizes the DDS algorithm to provide a high-resolution frequency signal, ensuring sufficiently small frequency steps. The PLL's bandpass characteristics also effectively suppress some spurious signals in the DDS output spectrum, achieving the complementary advantages of DDS and PLL. This improves the dynamic performance of the high-Q MEMS resonator control system, optimizes the stability accuracy of the MEMS gyroscope's amplitude and frequency, and further enhances the MEMS gyroscope's zero-bias output and anti-interference capabilities.

A frequency synthesis circuit includes a first inductor coupled to receive a first input signal at an input frequency, and a second inductor coupled to receive second input signal at the input frequency and out-of-phase relative to the first input signal. The circuit has first and second transistors with control terminals coupled to the first and second inductors, respectively. A first resonant tank of an inductor in parallel with a capacitor is coupled between a power supply terminal and the first transistor. A second resonant tank of an inductor in parallel with a capacitor is coupled between the power supply terminal and the second transistor. The first and second resonant tanks are tuned to a selected harmonic of the input frequency. An injection-locked oscillator has inputs coupled to the first and second transistors.

The invention relates to the technical field of signal acquisition, and discloses an RFSoC-based inter-board synchronization platform and method, the RFSoC-based inter-board synchronization platform comprises a frequency synthesis board, a time sequence control board and a plurality of acquisition board cards, the output end of the frequency synthesis board is connected with the input end of the time sequence control board and the input ends of the plurality of acquisition board cards, and the output end of the frequency synthesis board is connected with the input end of the time sequence control board. The output end of the time sequence control board is connected with the input ends of the plurality of acquisition board cards; the frequency synthesis board is used for outputting a reference clock signal to the time sequence control board and the plurality of acquisition board cards; the time sequence control board is used for synchronously outputting a synchronous trigger multiplexing signal to the plurality of acquisition board cards according to the reference clock signal, receiving synchronous deviation information of the plurality of acquisition board cards and carrying out time sequence synchronous correction on the plurality of acquisition board cards according to the synchronous deviation information; and the plurality of acquisition board cards are used for synchronously executing corresponding actions according to the synchronous triggering multiplexing signals. The method has the beneficial effects that the synchronism among the acquisition board cards is effectively improved, and the acquisition board cards and the acquisition channels in the acquisition board cards are ensured to be in a synchronous state.

The present invention discloses a multi-stage down-conversion frequency synthesis device and method, belonging to the field of frequency synthesis. The present invention simplifies the circuit and reduces debugging difficulty, making debugging easier. A VCO phase-locked loop also generates a fixed tuned local oscillator frequency using the multi-stage down-conversion method. The appropriate VCO fixed tuned local oscillator point can be flexibly selected based on different YTO frequency bands, effectively avoiding various intermodulation spurs. By mixing the YTO and VCO, the near-end phase noise curve of the YTO loop is brought close to the phase noise curve of the VCO loop, achieving a low phase noise level. Both the YTO loop and the VCO loop achieve low phase noise levels through the multi-stage down-conversion method, further flexibly suppressing intermodulation spurs.

The present invention relates to a satellite navigation signal system design method based on hybrid modulation of direct sequence spread spectrum and frequency hopping. The method comprises: spreading code sequences of multiple signal components being modulated and being then hybrid-multiplexed with signal components corresponding to a same frequency point, and forming a baseband code sequence on the basis of power allocation ratios of the signal components; on the basis of environment conditions, performing signal separation on the signal components corresponding to the baseband code sequence, in order to obtain separated radio frequency signals, and performing recombination and modulation on the signals; if the separated radio frequency signals are authorized signals, controlling a frequency hopping pattern by means of a frequency hopping code sequence, and performing hybrid frequency synthesis modulation on the basis of a center frequency point of the frequency hopping pattern and the frequency of the authorized signals; if the separated radio frequency signals are unauthorized signals, performing direct combining and radio frequency modulation on the unauthorized signals on the basis of a signal frequency point, in order to obtain recombined signal components; and performing signal power amplification on the basis of a center frequency point difference of the recombined signal components, in order to obtain direct sequence spread spectrum navigation signals. The method can greatly improve the anti-jamming capability of navigation signals.

The embodiment of the application provides a kind of wide frequency signal dynamic generation method and system based on multiple clock sources, the method comprises: by field programmable gate array real-time monitoring target frequency, and based on the frequency band of target frequency belongs to automatically switched to corresponding target clock source;When the target clock source is switched, the phase difference corresponding to the new and old target clock source is corrected by phase compensation register, and the compensation value is loaded to the phase offset register of direct digital frequency synthesis chip;Based on direct digital frequency synthesis chip, generate the fundamental wave waveform of wide frequency signal, and superimpose multiple harmonic components by sub-accumulation method, and the amplitude of each harmonic is independently controlled by look-up table method;The output signal of power amplifier is extracted by analog-digital converter, and the error information of measured waveform and theoretical waveform is extracted and dynamically corrected phase offset register and harmonic amplitude look-up table coefficient, and output target wide frequency signal.The application realizes the unity of wide frequency coverage, high resolution and fast response.