23 results about "Superheterodyne receiver" patented technology

The invention provides a simultaneous multiband superheterodyne receiver based on Rydberg atoms, and relates to the technical field of microwave electric field measurement, probe light provided by a probe light laser and coupling light provided by a coupling light laser oppositely enter an alkali metal atom gas chamber; the microwave signal sources of the multiple wave bands generate two paths of signals, one path of microwave signal is emitted to the space through the local oscillator microwave electric field emission horns of the wave bands, and the microwave electric field receiving horns of the wave bands receive corresponding echo signals. After frequency mixing of each wave band, the microwave electric field emission horn irradiates the alkali metal atom gas chamber at the same time, microwave fields of multiple wave bands are sequentially coupled with multiple pairs of continuous adjacent Rydberg states, and superheterodyne receiving is carried out on microwaves of multiple wave bands at the same time; and superheterodyne and high-sensitivity detection of microwave signals of multiple wave bands can be realized.

The application relates to the technical field of tunable N-path filter, in particular to a tunable N-path reflection-free filter and a superheterodyne receiver. The tunable N-path reflection-free filter comprises a signal source, an N-path band-pass filter unit, an N-path band-stop filter unit, an output resistor and a phase-splitting clock generating circuit. The output end of the signal source is connected with one end of the N-path band-pass filter unit and the N-path band-stop filter unit respectively, the other end of the N-path band-stop filter unit is connected with the output resistor, the gate of a plurality of MOS switches in the N-path band-pass filter unit and the N-path band-stop filter unit is connected with the phase-splitting clock generating circuit, and the phase-splitting clock generating circuit outputs a control signal. The tunable N-path reflection-free filter provided by the application has excellent frequency selectivity, can effectively suppress high-order harmonics, and can adjust the passband and the stopband by changing the switching frequency. Meanwhile, the filter can eliminate the reflected signal, prevent the intermodulation interference and gain fluctuation of the mixer and the high-gain amplifier in the system.

The invention discloses a multi-band radio frequency folding frequency measurement receiver with a reconfigurable working mode, which is characterized in that an intermediate frequency combining circuit and a dual-channel ADC (Analog to Digital Converter) circuit are sequentially in communication connection, and the intermediate frequency combining circuit is provided with a plurality of channels; the intermediate-frequency combining circuit and the dual-channel ADC circuit are used for sequentially combining and analyzing sub intermediate-frequency signals in at least one channel in a full-band instantaneous mode, a high-sensitivity frequency sweeping mode, a high-sensitivity frequency sweeping fixed-frequency mode or a high-sensitivity fixed-frequency mode in response to different preset instructions, so that the sub intermediate-frequency signals in at least one channel are obtained; the sub-intermediate-frequency signals are obtained based on phase shift of the intermediate-frequency signals, the number of the intermediate-frequency signals is at least one, and the intermediate-frequency signals are obtained based on frequency conversion of the corresponding source radio-frequency signals, so that the problem that a superheterodyne receiver is mutually restricted in an instantaneous coverage frequency range, the number of equipment channels and an intermediate-frequency working frequency range is solved; the method has the advantages of simple hardware structure, low cost, wide instantaneous coverage frequency domain, high performance and the like.

The invention relates to the technical field of electromagnetic environment effect testing, and discloses a phased array multifunctional electromagnetic environment effect testing system and a calibration method thereof.The system comprises an active array plane, a comprehensive processing extension set, a comprehensive frequency source extension set, an external feed source combination, a superheterodyne receiver and a digital acquisition extension set; wherein the active array plane is provided with a plurality of minimum sub-arrays, each minimum sub-array is composed of at least one active channel and a corresponding radiation antenna unit, and each minimum sub-array is used for receiving one excitation signal to complete power amplification and radiation synthesis; and the path number of the independent excitation signals generated by the comprehensive frequency source extension set corresponds to the number of the minimum subarrays. The calibration method comprises darkroom plane near-field calibration, external feed source combination calibration and active array plane calibration before working. The system and the method provided by the invention have the advantages of relatively strong accurate construction capability of a complex electromagnetic environment, extremely high test flexibility, multi-beam coordination and high-precision full-link calibration, and stable and reliable operation.

The invention relates to the technical field of wireless communication signal direction finding, in particular to a broadband high-precision single-channel direction finding device and method based on a time division multiplexing phase shift technology. The device comprises an antenna array used for receiving a 20MHz-1GHz frequency band signal; the antenna signal processing unit is used for carrying out preprocessing before frequency conversion on the received 20MHz-1GHz frequency band signals and intensively transmitting the preprocessed multi-channel signals to the single-channel radio frequency front end; the radio frequency front end is used for down-converting a multi-channel signal to 10.7 MHz and outputting the multi-channel signal through two-stage frequency conversion by adopting a superheterodyne receiver mode; and the direction finding receiver is used for sampling 10.7 MHz signals output by the radio frequency front end by using a 16-bit high-precision ADC (Analog to Digital Converter), performing preset algorithm processing through an FPGA (Field Programmable Gate Array), calculating a wave angle, and outputting received signal spectrum data to the display control computer through a gigabit network port. According to the invention, while the complexity and cost of equipment are reduced, the direction finding precision is improved, the anti-interference capability is enhanced, and the real-time performance is improved.

The present application relates to electromagnetic environment effect test technical field, disclose a kind of phased array multifunctional electromagnetic environment effect test system and its calibration method, system includes active array surface and comprehensive processing extension, comprehensive frequency source extension, external feed source combination, superheterodyne receiver and digital acquisition extension;Wherein: active array surface has dry minimum subarray, each minimum subarray is formed by at least one active channel and corresponding radiating antenna unit, each minimum subarray is used to receive one way excitation signal to complete power amplification and radiate synthesis;And the number of independent excitation signal generated by comprehensive frequency source extension corresponds with the number of minimum subarray.The calibration method includes darkroom planar near-field calibration, external feed source combination calibration and active array surface calibration before work.The system and method of the present application have strong accurate construction ability of complex electromagnetic environment, extremely high test flexibility, multi-beam coordination and high-precision full-link calibration, stable and reliable operation.

The invention relates to the technical field of tunable N-path filters, in particular to an adjustable N-path non-reflection filter and a superheterodyne receiver, the adjustable N-path non-reflection filter comprises a signal source, an N-path band-pass filtering unit, an N-path band-stop filtering unit, an output resistor and a split-phase clock generation circuit; wherein the output end of the signal source is connected with one end of the N-path band-pass filtering unit and one end of the N-path band-stop filtering unit, the other end of the N-path band-stop filtering unit is connected with the output resistor, and the split-phase clock generation circuit is connected with grid electrodes of a plurality of MOS switches in the N-path band-pass filtering unit and the N-path band-stop filtering unit and outputs control signals. The adjustable N-path non-reflection filter provided by the invention has excellent frequency selectivity, can effectively suppress higher harmonics, and can adjust a pass band and a stop band by changing the switching frequency. Meanwhile, the filter can eliminate reflected signals and prevent the reflected signals from inducing a mixer and a high-gain amplifier in a system to generate intermodulation interference and gain fluctuation.

The application relates to a two-dimensional sliding window-based super-long link transmission parameter self-synchronization measurement method, which calculates the frequency scanning point number of a frequency scanning source and the frequency segment number of a receiver, sets the frequency scanning source to step and scan power according to a measurement frequency resolution, sets the receiver to wait in any segment, sequentially searches and finds the power of a test frequency point in the segment, switches the center frequency of a superheterodyne receiver when the frequency scanning of the frequency scanning source reaches the end frequency of the segment, sequentially searches and finds the power of all test frequency points in the next segment, and then returns to the first segment to cyclically and reciprocally measure until the scanning of all segments is completed. A transmission parameter measurement device of a long-distance communication link is constructed, step-by-step and autonomous scanning is performed in the frequency domain, a spectrum acquisition module slides in the frequency and time dimensions, the power levels of measurement signals in a frequency scanning band are self-synchronously detected, the accurate measurement of the full-band gain and the amplitude-frequency corresponding curve of a long-distance communication link is realized, and data support is provided for link self-checking and fault diagnosis.

The application discloses a working mode reconfigurable multi-band radio frequency folding frequency measurement receiver. The intermediate frequency combining circuit and the double-channel ADC circuit are connected in sequence. The intermediate frequency combining circuit has multiple channels. The intermediate frequency combining circuit and the double-channel ADC circuit are used for responding to different preset instructions, and sequentially performing combining and analysis processing on the sub-intermediate frequency signals in at least one channel in a full-band instantaneous mode, a high-sensitivity sweep frequency mode, a high-sensitivity sweep frequency fixed frequency mode or a high-sensitivity fixed frequency mode, and correspondingly obtaining first target signals to fourth target signals. The sub-intermediate frequency signals are obtained by phase shifting the intermediate frequency signals, and the intermediate frequency signals are at least one way and are obtained by frequency conversion based on corresponding source radio frequency signals. The problem that the superheterodyne receiver is restricted by the instantaneous coverage frequency range, the number of device channels and the intermediate frequency working frequency range is solved. The application has the advantages of simple hardware structure, low cost, wide instantaneous coverage frequency domain and high performance.

The embodiment of the invention provides a communication signal underdetermined blind source separation algorithm verification system and method based on a yagi antenna. A blind source signal acquisition system is designed by using a yagi antenna, a superheterodyne receiver, data acquisition software and the like. And a standard signal source, an interphone and other signal sources are used as experimental blind source signals. The blind source signal acquisition system is provided with two acquisition channels, and intermediate frequency (IF) data of multiple paths of source signals can be simultaneously acquired in a real-time bandwidth by setting a signal source and a receiving frequency. Sampled intermediate frequency data is used as input data of the algorithm and is used for comparing and verifying source number estimation and source signal recovery effects of various underdetermined blind source separation algorithms.

Apparatuses and methods for simultaneously operating as a wireless radio and monitoring the local frequency spectrum. For example, described herein are wireless radio devices that use a secondary receiver to monitor frequencies within the operating band and prevent or avoid interferers, including in particular half-IF interferers. The systems, devices, and methods described herein may adjust the intermediate frequency in a superheterodyne receiver to select an intermediate frequency that minimizes interference. In particular, described herein are apparatuses and methods that use a second receiver which is independent of the first receiver and may be connected to the same receiving antenna to monitor the geographically local frequency spectrum and may detect spurious interferers, allowing the primary receiver to adjust the intermediate frequency and avoid spurious interferes.

This embodiment provides a verification system and method for an underdetermined blind source separation algorithm based on a Yagi antenna. A blind source signal acquisition system is designed using a Yagi antenna, a superheterodyne receiver, and data acquisition software. Standard signal sources and walkie-talkies are used as experimental blind source signals. This blind source signal acquisition system has two acquisition channels. By setting the signal source and receiving frequency, it can simultaneously acquire intermediate frequency (IF) data from multiple source signals within the real-time bandwidth. The sampled IF data is used as input data for the algorithm to compare and verify the source number estimation and source signal recovery effects of various underdetermined blind source separation algorithms.

The utility model belongs to the technical field of communication, and discloses a wide-frequency-band transceiving channel circuit, which comprises a receiving circuit, a transmitting circuit and a receiving circuit, the receiving circuit comprises a low-pass filter, a numerical control attenuator, an amplitude limiter, an LNA amplifier, a radio frequency switch, a segmented low-pass filter, a radio frequency switch, a low-pass filter, a frequency mixer, a band-pass filter, a radio frequency amplifier, a band-pass filter, a frequency mixer, a low-pass filter, a numerical control attenuator, a radio frequency amplifier, a numerical control attenuator, a radio frequency amplifier and a radio frequency switch which are connected in sequence; a filter, a radio frequency switch, a radio frequency amplifier and a low-pass filter are selected according to different bandwidths; the system also comprises a transmitting circuit. The transmitting circuit comprises a numerical control attenuator, a radio frequency amplifier, a tuned filter and a radio frequency switch which are connected in sequence. According to the utility model, a superheterodyne receiver architecture and a twice frequency mixing design are adopted, and the antenna also has the advantages of wide frequency band, high gain, high dynamic range and multiple bandwidth modes.

The application discloses a multi-frequency band microwave superheterodyne receiver based on a solid quantum system, which comprises a diamond (1), a light source (2), a dichroic mirror (3), a photoelectric detector (4), a control and processing system (5), an antenna (6), a reference microwave source (7) and a magnetic field generating and adjusting device. The ground state energy level of a nitrogen vacancy color center in the diamond (1) is regulated by controlling the light source (2) and the magnetic field generating and adjusting device. When a to-be-detected microwave and a reference microwave simultaneously act on the nitrogen vacancy color center of the diamond, frequency mixing is generated. Through the effect, the control and processing system (5) reads in an electric signal from the photoelectric detector (4), and the accurate detection of a to-be-detected microwave frequency and phase is realized. The system is simple and easy to integrate, and can be applied to a microwave quantum radar, so that wide spectrum and large dynamic target echo information can be acquired, and the detection performance is better than that of a traditional radar.

The application relates to the technical field of wireless communication signal direction finding, in particular to a wide-band high-precision single-channel direction finding device and method based on time division multiplexing phase shift technology. The device comprises an antenna array for receiving 20MHz-1GHz frequency band signals; an antenna signal processing unit for pre-processing the received 20MHz-1GHz frequency band signals before frequency conversion and centrally transmitting the pre-processed multi-channel signals to a single-channel radio frequency front end; the radio frequency front end is used in the mode of a superheterodyne receiver, and through two-stage frequency conversion, the multi-channel signals are down-converted to 10.7MHz output; a direction finding receiver is used for sampling the 10.7MHz signals output by the radio frequency front end by using a 16-bit high-precision ADC, performing preset algorithm processing through an FPGA, and outputting the calculated wave angle to a display control computer through a gigabit network port together with the received signal spectrum data. The application can reduce the complexity and cost of the equipment, improve the direction finding precision, enhance the anti-interference ability and improve the real-time performance.

The utility model discloses a wide-area electromagnetic instrument receiver which comprises a base, a supporting mechanism and a fixing mechanism. A receiving box is placed at the upper end of the base, and a superheterodyne receiver is arranged in the receiving box; the supporting mechanism comprises a first connecting base, a connecting assembly, a first connecting rod, a second connecting base, a second connecting rod and a third connecting base, the first connecting base is arranged at the lower end of the base, rotating bases which are evenly distributed are arranged at the lower end of the first connecting base, and the outer arc face of the second connecting base is fixedly connected with the second connecting rods which are arranged in pairs and evenly distributed; third connecting seats are fixedly connected to the ends, away from the second connecting seats, of the two second connecting rods in each set, connecting assemblies are arranged at the upper ends of the third connecting seats and the rotating seat, and first connecting rods distributed in a bilateral symmetry mode are fixedly connected between every two vertically adjacent connecting assemblies; the wide-area electromagnetic instrument receiver is supported by the bracket which is high in stability and convenient to assemble, so that the wide-area electromagnetic instrument receiver is convenient to move and use while providing protection.

The utility model discloses a radio frequency acquisition preprocessing device, which relates to the technical field of radio frequency signal receiving, solves the problem of low integration level of the existing ultra-wideband superheterodyne receiver, and is characterized by comprising a local oscillator unit and a receiving unit, wherein the local oscillator source is connected with the first power divider, the first power divider is respectively connected with the frequency doubler and the frequency tripler, the frequency tripler is connected with the second power divider, the second power divider is respectively connected with the frequency hopping source and the dot frequency source, the frequency hopping source is connected with the frequency doubler, the first power divider outputs first frequency doubling, the frequency doubler outputs second frequency doubling, and the dot frequency source outputs second frequency doubling. The second divider outputs third frequency multiplication, the frequency multiplier outputs fourth frequency multiplication, and the dot frequency source outputs fifth frequency multiplication; the first frequency multiplication, the second frequency multiplication and the third frequency multiplication are connected with the frequency conversion processing unit to provide a vibration source, the fourth frequency multiplication is connected with the first frequency mixing unit to provide a vibration source, and the fifth frequency multiplication is connected with the second frequency mixing unit to provide a vibration source; the integration level of the ultra-wideband superheterodyne receiver is improved by sharing a local oscillator source and a processing channel.

The invention belongs to the technical field of local oscillator signal output, and particularly discloses a local oscillator output circuit and a short-wave superheterodyne receiver. A single crystal oscillator harmonic generation architecture is adopted to replace a traditional multi-PLL scheme, all local oscillator signals are from a reference clock of the same high-frequency crystal oscillator and harmonic waves of the reference clock, the homologous characteristic ensures frequency coherence between the signals, and stray and phase noise generated by mutual traction of a plurality of independent PLLs are eliminated fundamentally. The fundamental frequency higher than 30MHz is selected and the higher harmonics of the fundamental frequency are utilized, so that the fundamental frequency and the output frequency of each stage of local oscillator are located outside the short wave receiving frequency band, and the sensitivity of the receiver is not influenced by any circuit leakage. Meanwhile, the three-stage local oscillator signal naturally forms a frequency interval of more than two octaves based on the harmonic relation, so that the inter-stage mirror image interference frequency is far away from each other and can be effectively suppressed through simple filtering. According to the scheme, dual suppression of local oscillator leakage and mirror image interference is systematically realized while the circuit structure is simplified finally.

The invention relates to a super-long link transmission parameter self-synchronization measurement method based on a two-dimensional sliding window, which comprises the following steps: calculating the number of scanning frequency points of a sweep frequency source and the number of frequency segments of a receiver, setting the sweep frequency source to carry out stepping equipower scanning according to a measurement frequency resolution, and setting the receiver to wait in any segment; and when the frequency of the sweep frequency source scans to the end frequency of the subsection, switching the center frequency of the superheterodyne receiver, sequentially searching and finding the power of all the test frequency points of the next section until the scanning of all the subsections is finished, returning to the first section, and circularly and repeatedly carrying out measurement. A transmission parameter measuring device of a remote ultra-long communication link is constructed, stepping autonomous scanning is carried out on a frequency domain, a frequency spectrum acquisition module slides on frequency and time dimensions, the power level of a measurement signal in a sweep frequency band is detected in a self-synchronization mode, and accurate measurement of full-frequency-band gain and amplitude-frequency corresponding curves of the remote ultra-long distance communication link is achieved. And data support is provided for link self-checking and fault diagnosis.

Apparatuses and methods for simultaneously operating as a wireless radio and monitoring the local frequency spectrum. For example, described herein are wireless radio devices that use a secondary receiver to monitor frequencies within the operating band and prevent or avoid interferers, including in particular half-IF interferers. The systems, devices, and methods described herein may adjust the intermediate frequency in a superheterodyne receiver to select an intermediate frequency that minimizes interference. In particular, described herein are apparatuses and methods that use a second receiver which is independent of the first receiver and may be connected to the same receiving antenna to monitor the geographically local frequency spectrum and may detect spurious interferers, allowing the primary receiver to adjust the intermediate frequency and avoid spurious interferes.

The application discloses a local oscillator signal generation circuit and a superheterodyne receiver, and belongs to the technical field of superheterodyne receivers. The local oscillator signal generation circuit comprises a first local oscillator circuit and a second local oscillator circuit. In the first local oscillator circuit, a K frequency multiplier multiplies a reference signal by K, a first phase discriminator generates an error signal based on the reference signal and a second mixer output, a first loop filter outputs a tuning voltage to control a first voltage-controlled oscillator to generate an oscillation signal, and a first local oscillator coupler divides the oscillation signal into two paths, one path generates a first local oscillator signal, and the other path mixes a second local oscillator signal output by the second local oscillator circuit to obtain a first mixed signal, the first mixed signal is mixed with a K frequency signal to obtain a second mixed signal and is fed back to the first phase discriminator. The application maps the phase noise of the second local oscillator to the first local oscillator, realizes coherent cancellation in cooperation with the second mixing of the receiver, and significantly reduces the total phase noise of the system without a frequency divider in the feedback path.

The invention relates to the technical field of navigation satellite systems, and particularly discloses a method for eliminating interference signals of a radio frequency receiver in a navigation system. The method is based on a low-intermediate frequency receiver architecture, and the problem of mirror image interference is effectively solved by introducing a passive multi-phase filter. The method comprises the following steps: receiving a radio-frequency signal and down-converting the radio-frequency signal to a low-intermediate frequency through a mixer to generate an orthogonal differential mixed signal; inputting the four paths of orthogonal signals into a passive multi-phase filter with a symmetric RC network structure; the phase difference (orthogonal anticlockwise and clockwise sequence) between the useful signal and the mirror image signal is utilized to realize complete filtering of the mirror image signal; and finally, compensating the gain loss through a post-stage circuit, and outputting a pure signal to the baseband processing module. According to the invention, the dependence of a traditional superheterodyne receiver on a high-Q-value filter is overcome, and the problem of direct-current imbalance of a direct frequency conversion receiver is also avoided.

The invention discloses an SoC-based integrated superheterodyne receiver, and the receiver comprises a low-noise amplification module, a frequency mixing module, a local oscillator link module, and an intermediate frequency link module, and all the modules are integrated in a single-cavity packaging structure. Through the structural arrangement of the integrated superheterodyne receiver, the system structure and processing steps are simplified, the space is effectively saved, the signal noise is remarkably improved, different channels are mutually independent and are not interfered, and a local oscillator signal can provide uniform driving power. When the device is applied to a specific measurement environment, detection of different physical quantities such as multi-point temperature and speed can be carried out. The system has the advantages of multiple measurement channels, simple structure, low cost, easiness in maintenance and the like.