CN210323343U - Ultrashort wave binary channels broadband direction finding system - Google Patents
Ultrashort wave binary channels broadband direction finding system Download PDFInfo
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- CN210323343U CN210323343U CN201921056840.4U CN201921056840U CN210323343U CN 210323343 U CN210323343 U CN 210323343U CN 201921056840 U CN201921056840 U CN 201921056840U CN 210323343 U CN210323343 U CN 210323343U
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Abstract
The utility model discloses an ultrashort wave binary channels broadband direction finding system, include: an antenna array for receiving wireless signals; the dual-channel radio frequency unit is connected with the antenna array and the signal processing unit; the signal processing unit is used for receiving the signals processed by the dual-channel radio frequency unit and monitoring the signals; and the processing terminal is connected with the signal processing unit, receives the data signal output by the signal processing unit, displays and stores a monitoring result, and is used for inputting direction-finding parameters by a user. The utility model discloses a radio frequency unit and signal processing unit monitor the signal, according to the threshold deviant that is used for the input simultaneously, select the antenna that corresponds, utilize the signal phase difference that the different baselines of antenna array received, carry out the signal direction finding, through this scheme, can to a great extent improve the direction finding rate of accuracy of direction finding system, reduce the misstatement rate to the signal.
Description
Technical Field
The utility model relates to an ultrashort wave binary channels signal direction finding field especially relates to an ultrashort wave binary channels broadband direction finding system.
Background
The direction-finding system is a tool which is considered to be used for determining the direction of an information transmitting station of radio-frequency radiation sources such as radio signals, illegal broadcast signals or radars and the like, and in actual use, accurate and efficient direction-finding capability is of great importance to all military and civil fields. Along with the increasing strength and popularization of personal unmanned aerial vehicle functions, the unmanned aerial vehicle can form great threat to airports and national confidential departments, illegal broadcasting stations are forbidden frequently, and a direction-finding system can position the position of an illegal target and is matched with working personnel to remove potential safety hazards. The existing direction-finding system carries out direction-finding on signals in a frequency band when the direction-finding of the signals is carried out, the signal-to-noise ratio and the signal power value of the signals are not distinguished, a lot of false reports can be caused, and the direction-finding efficiency is lost.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to the above-mentioned problem, provide an ultrashort wave binary channels broadband direction finding system.
An ultrashort wave two-channel broadband direction finding system, comprising: the antenna array receives wireless signals and respectively sends the signals received by each antenna array element on the antenna array to the corresponding direction-finding channel through the antenna matrix switch; the dual-channel radio frequency unit is connected with the antenna array and the signal processing unit, is provided with two direction-finding channels, performs down-conversion processing on signals received by the antenna array, and transmits the processed signals to the signal processing unit; the signal processing unit is used for receiving the signals processed by the dual-channel radio frequency unit, monitoring the signals, and estimating the transmitting direction of the signals by using the phase difference of the signals reaching the antenna array on the base line through different base lines formed by the antenna array; and the processing terminal is connected with the signal processing unit, receives the data signal output by the signal processing unit, displays and stores a monitoring result, and is used for a user to input direction-finding parameters, wherein the direction-finding parameters comprise a working frequency band, an azimuth range and a threshold deviation value.
The dual-channel radio frequency unit comprises two digital down converters, down-conversion processing is carried out on signals of the two direction-finding channels, and the two paths of signals are transmitted to the signal processing unit and are used for signal monitoring and signal direction finding respectively.
The signal processing unit includes: the system comprises an analog-to-digital converter, a digital filter bank and a DSP (digital signal processor); the analog-to-digital converter is used for performing analog-to-digital conversion on the received signal so as to facilitate subsequent digital filtering; the digital filter bank is used for filtering and sampling the digital signals to obtain I, Q data signals with different time resolutions; the DSP processor is used for carrying out signal monitoring according to I, Q data and carrying out signal direction finding according to an input threshold deviation value.
The antenna array is a nine-unit direction-finding antenna array, and wave front distortion and phase ambiguity caused by reflection multipath are eliminated by using direction-finding baselines with different lengths formed by nine array elements.
Furthermore, the ultrashort wave double-channel broadband direction finding system further comprises an antenna control unit which is connected with the antenna matrix switch and the signal processing unit, and the antenna is automatically selected through the antenna matrix switch according to a threshold deviation value input by a processing terminal user and used for signal direction finding.
Furthermore, the ultrashort wave double-channel broadband direction finding system further comprises a calibration unit, wherein the calibration unit sends a calibration signal sent by the calibration unit into the double-channel radio frequency unit through the antenna matrix switch, and is used for calculating the phase difference and the amplitude difference of an output signal and the calibration signal of the double-channel radio frequency unit to perform phase compensation and calibration.
Furthermore, the ultrashort wave double-channel broadband direction finding system further comprises an electronic compass, the electronic compass is used for providing the direction-indicating degree of the detected signal for the signal processing unit, the processing terminal is used for displaying the instantaneous value and the maximum probability value of the direction-indicating degree, and the direction-finding grade is given.
Furthermore, the ultrashort wave double-channel broadband direction finding system also comprises a GPS receiver which provides longitude and latitude of a detected signal to the signal processing unit and is used for processing the terminal to mark the real position of the monitoring point on a map.
The utility model has the advantages that: the utility model discloses a radio frequency unit and signal processing unit monitor the signal, according to the threshold deviant that is used for the input simultaneously, select the antenna that corresponds, utilize the signal phase difference that the different baselines of antenna array received, carry out the signal direction finding, through this scheme, can to a great extent improve the direction finding rate of accuracy of direction finding system, reduce the misstatement rate to the signal.
Drawings
Fig. 1 is a schematic block diagram of the structure of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.
In this embodiment, as shown in fig. 1, an ultrashort wave dual-channel broadband direction finding system includes: the antenna array receives wireless signals and respectively sends the signals received by each antenna array element on the antenna array to the corresponding direction-finding channel through the antenna matrix switch; the dual-channel radio frequency unit is connected with the antenna array and the signal processing unit, is provided with two direction-finding channels, performs down-conversion processing on signals received by the antenna array, and transmits the processed signals to the signal processing unit; the signal processing unit is used for receiving the signals processed by the dual-channel radio frequency unit, monitoring the signals, and estimating the transmitting direction of the signals by using the phase difference of the signals reaching the antenna array on the base line through different base lines formed by the antenna array; and the processing terminal is connected with the signal processing unit, receives the data signal output by the signal processing unit, displays and stores a monitoring result, and is used for a user to input direction-finding parameters, wherein the direction-finding parameters comprise a working frequency band, an azimuth range and a threshold deviation value.
The 30 MHz-3000 MHz signal induced by the direction finding antenna enters the analog channel of the receiver at first, and the analog channel adopts a three-time frequency conversion scheme. After three times of frequency conversion, the intermediate frequency signals with the bandwidth of 20MHz and the center of 70MHz are formed by filtering, and after amplification, the intermediate frequency signals are respectively sent to a sampler for digital signal processing.
The direction-finding function is based on a related interferometer technical system, a nine-array element direction-finding system is adopted, fixed-frequency signals, frequency hopping signals and short-time signals in a working frequency range are searched and intercepted, and working modes such as broadband direction finding, fixed-frequency direction finding and frequency hopping direction finding are supported.
The threshold judgment direction finding method comprises the following steps:
the system completes frequency band selection and down-conversion of analog signals through a dual-channel direction finding receiver, completes analog-digital conversion after sampling from the middle frequency (70 MHz), converts the analog signals into orthogonal baseband signals through a DDC digital down-converter, performs flexible filtering sampling through various digital filters, and outputs I, Q data signals with different time resolutions. I. And after the Q data is processed, the result is sent to a processing terminal, and the monitoring result is displayed and stored.
According to the IQ processed result, the system estimates the bottom noise value of the signal, the system generates a threshold value by adding the automatically estimated bottom noise value and an offset value set by a user, and the signal direction-finding component carries out direction finding on the signal higher than the threshold value. A user can manually set a threshold value, and a part of signals with low signal-to-noise ratio are filtered, so that the false alarm rate of direction finding is reduced, and the direction finding efficiency is improved.
In this embodiment, the specific threshold determination screening process is as follows, and when the user performs broadband direction finding, the signal satisfying the condition is selected according to the threshold setting and the estimation result. Automatically selecting corresponding antenna arrays, and respectively sending signals received by antenna array elements on the antenna arrays to corresponding direction-finding channels through an antenna array switch. After the signal processing unit receives the information of each direction-finding channel, the direction-finding degree of the detected signal can be obtained after the azimuth information of the electronic compass is obtained through specific processing and algorithm. In the direction finding process, the instantaneous value and the maximum probability value of the direction showing degree can be displayed, and the direction finding grade is given.
Preferably, to display the direction finding result on an electronic map, the GPS receiver provides the longitude and latitude of the monitoring point, and the system software marks the real position of the monitoring point on the map, and draws the direction showing degree by taking the point as a starting point.
In the direction finding process, different baselines are formed by using the direction finding antenna array, and the arrival direction of the antenna is estimated by using the signal phase difference of the antenna array on the arrival baselines; by using the direction-finding baselines with different lengths formed by nine array elements, wave front distortion and phase ambiguity caused by reflection multipath are eliminated, so that a direction-finding result with higher precision is obtained.
The direction finding process is divided into a correction stage and a direction finding stage.
a) Correction phase
In order to ensure the direction-finding precision, the signal phase deviation from the radio frequency front end to the channel of the down-conversion unit needs to be corrected before the direction-finding process starts. The antenna switch is controlled to be switched to a correction channel, a correction source sends a correction signal to the direction-finding antenna switch array, and the correction signal is sent to a receiving channel of the down-conversion unit; the receiving channel receives the correction signal, the multi-channel signal after down-conversion is sent to the general signal processing board, the phase difference and the amplitude difference of the output signal of the down-conversion unit and the correction source signal of the input direction-finding antenna switch array are calculated, phase compensation and correction are carried out, and the consistency of the phase of each channel signal is ensured.
b) Course of direction finding
Before direction finding, firstly, a direction finding mode (broadband direction finding, fixed frequency/frequency hopping waiting direction finding) and direction finding parameters (working frequency band, azimuth range and the like) are specified, and the working state of each channel of the down-conversion unit is controlled according to the mode parameters; meanwhile, a direction-finding antenna switch array is controlled to be switched to the antenna of the corresponding frequency band, a down converter receives the radio frequency signal of the antenna of the corresponding frequency band, and the signal is subjected to down conversion to generate an analog intermediate frequency signal; the analog intermediate frequency signal is converted by the AD acquisition unit and then transmitted back to the signal processing unit.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. An ultrashort wave two-channel broadband direction finding system, comprising:
the antenna array receives wireless signals and respectively sends the signals received by each antenna array element on the antenna array to the corresponding direction-finding channel through the antenna matrix switch;
the dual-channel radio frequency unit is connected with the antenna array and the signal processing unit, is provided with two direction-finding channels, performs down-conversion processing on signals received by the antenna array, and transmits the processed signals to the signal processing unit;
the signal processing unit is used for receiving the signals processed by the dual-channel radio frequency unit, monitoring the signals, and estimating the transmitting direction of the signals by using the phase difference of the signals reaching the antenna array on the base line through different base lines formed by the antenna array;
and the processing terminal is connected with the signal processing unit, receives the data signal output by the signal processing unit, displays and stores a monitoring result, and is used for a user to input direction-finding parameters, wherein the direction-finding parameters comprise a working frequency band, an azimuth range and a threshold deviation value.
2. The ultrashort wave dual-channel broadband direction finding system as claimed in claim 1, wherein the dual-channel radio frequency unit comprises two digital down converters for down-converting signals of two direction finding channels and transmitting two signals to the signal processing unit for signal monitoring and signal direction finding respectively.
3. The ultrashort wave two-channel broadband direction finding system of claim 1, wherein the signal processing unit comprises: the system comprises an analog-to-digital converter, a digital filter bank and a DSP (digital signal processor); the analog-to-digital converter is used for performing analog-to-digital conversion on the received signal so as to facilitate subsequent digital filtering; the digital filter bank is used for filtering and sampling the digital signals to obtain I, Q data signals with different time resolutions; the DSP processor is used for carrying out signal monitoring according to I, Q data and carrying out signal direction finding according to an input threshold deviation value.
4. The ultrashort wave dual-channel broadband direction finding system of claim 1 further comprising an antenna control unit connected to the antenna matrix switch and the signal processing unit for autonomously selecting an antenna for signal direction finding through the antenna matrix switch according to a threshold offset value input by a processing end user.
5. The ultrashort wave dual-channel broadband direction finding system as claimed in claim 1, wherein the antenna array is a nine-element direction finding antenna array, and wave front distortion and phase ambiguity caused by multipath reflection are eliminated by using direction finding baselines with different lengths and formed by nine array elements.
6. The ultrashort wave dual-channel broadband direction finding system of claim 1, further comprising a calibration unit, wherein the calibration unit sends a calibration signal sent by the calibration unit to the dual-channel radio frequency unit through the antenna matrix switch, and the calibration signal is used for calculating a phase difference and an amplitude difference between an output signal of the dual-channel radio frequency unit and the calibration signal to perform phase compensation and calibration.
7. The ultrashort wave two-channel broadband direction finding system as claimed in claim 1, further comprising an electronic compass providing the direction-indicating degree of the detected signal to the signal processing unit for processing the terminal to display the instantaneous value and the maximum probability value of the direction-indicating degree and give a direction-finding grade.
8. The ultrashort wave two-channel broadband direction finding system as claimed in claim 1, further comprising a GPS receiver for providing longitude and latitude of the detected signal to the signal processing unit for processing the terminal to mark the real position of the monitoring point on a map.
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| CN201921056840.4U CN210323343U (en) | 2019-07-08 | 2019-07-08 | Ultrashort wave binary channels broadband direction finding system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208737A (en) * | 2019-07-08 | 2019-09-06 | 成都爱科特科技发展有限公司 | A kind of ultrashort wave binary channels broadband direction-finding system and thresholding determine direction-finding method |
| CN117031392A (en) * | 2023-10-08 | 2023-11-10 | 北京海格神舟通信科技有限公司 | Method and system for direction finding of dual-channel receiver |
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2019
- 2019-07-08 CN CN201921056840.4U patent/CN210323343U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208737A (en) * | 2019-07-08 | 2019-09-06 | 成都爱科特科技发展有限公司 | A kind of ultrashort wave binary channels broadband direction-finding system and thresholding determine direction-finding method |
| CN110208737B (en) * | 2019-07-08 | 2024-05-14 | 成都爱科特科技发展有限公司 | Ultrashort wave double-channel broadband direction finding system and threshold judgment direction finding method |
| CN117031392A (en) * | 2023-10-08 | 2023-11-10 | 北京海格神舟通信科技有限公司 | Method and system for direction finding of dual-channel receiver |
| CN117031392B (en) * | 2023-10-08 | 2023-12-29 | 北京海格神舟通信科技有限公司 | Method and system for direction finding of dual-channel receiver |
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