CN211656138U - Yangtze river maritime affairs direction finding receiver - Google Patents
Yangtze river maritime affairs direction finding receiver Download PDFInfo
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- CN211656138U CN211656138U CN202021765359.5U CN202021765359U CN211656138U CN 211656138 U CN211656138 U CN 211656138U CN 202021765359 U CN202021765359 U CN 202021765359U CN 211656138 U CN211656138 U CN 211656138U
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Abstract
The utility model discloses a Yangtze river maritime affairs direction finding receiver, including first this vibration source, second this vibration source and five independent receiving channel that receive different incoming wave direction electromagnetic wave signals, first this vibration source and second this vibration source do not divide five ways successfully and give five independent receiving channel uses. The utility model discloses direction finding receiver adopts the superheterodyne structural style of twice frequency conversion, with the microwave signal (20-3000 MHz) frequency conversion of broadband to intermediate frequency (70 MHz 10MHz, 70MHz 0.5 MHz) subsequent data acquisition level and digital signal processing of being convenient for. The receiver adopts three-stage filtering to improve the sensitivity and effectively solve the problems of stray and interference among frequencies.
Description
Technical Field
The utility model relates to a Changjiang river maritime affairs direction finding receiver belongs to communication technology field.
Background
The Yangtze river maritime direction-finding receiver measures the electromagnetic wave and the propagation direction thereof transmitted by a radio station by using a radio direction-finding algorithm so as to determine the position of a transmitter. The existing product adopts a three-time frequency conversion mode, has complex structure, large size, troublesome processing and production and high cost, and most of the product only covers the frequency band of 156-174MHz and can not adapt to the existing complex electromagnetic environment.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: problem and not enough to exist among the prior art, the utility model provides a simple structure, with low costs and the strong maritime affairs direction-finding receiver of suitability.
The technical scheme is as follows: a Yangtze river maritime direction-finding receiver, characterized in that: the receiving device comprises a first local vibration source, a second local vibration source and five independent receiving channels for receiving electromagnetic wave signals in different incoming wave directions, wherein the output ends of the first local vibration source and the second local vibration source are respectively connected with each independent receiving channel.
The utility model discloses the technical scheme who further injects does: the independent receiving channel comprises an amplitude limiter for receiving the output signal of the antenna, an attenuator, a first filter, a first mixer, a second filter, a first amplifier, a second mixer, a first switch, a third filter, a fourth filter, a second switch and a second amplifier;
the output end of the amplitude limiter is connected with the input end of an attenuator, the output end of the attenuator is connected with the input end of a first filter, the output end of the first filter is connected with the IF input end of a first mixer, the RF output end of the first mixer is connected with the input end of a second filter, the output end of the second filter is connected with the input end of a first amplifier, the output end of the first amplifier is connected with the RF input end of a second mixer, the IF output end of the second mixer is connected with the input end of a first switch, the output end of the first switch is respectively connected with the input ends of a third filter and a fourth filter, the output ends of the third filter and the fourth filter are simultaneously connected with the input end of a second switch, and the output end of the second switch is connected with the input end of a second amplifier;
the output end of the first local vibration source is connected with the LO input end of the first frequency mixer, and the output end of the second local vibration source is connected with the LO input end of the second frequency mixer.
Preferably, the first local vibration source and the second local vibration source use the same clock reference source, and a first power divider is connected between the clock reference source and the first local vibration source and between the clock reference source and the second local vibration source, an output end of the first local vibration source is divided into five paths by a second power divider and then is respectively connected with an input end of a first mixer of the five independent receiving channels, and an output end of the second local vibration source is divided into five paths by a third power divider and then is respectively connected with an input end of a second mixer of the five independent receiving channels.
Preferably, the limiter is RLM-33 of mini-circuits.
Preferably, the first mixer is M2-0218LE-1 from Marki-Microwave.
Preferably, the second filter is a dielectric filter with a center frequency of 3470MHz and a bandwidth of + -15 MHz.
Preferably, the first amplifier is HMC311SC70E from Analog-Device.
Preferably, the second mixer is ADE-30W of mini-circuits.
Has the advantages that: compared with the prior art, the utility model discloses direction finding receiver adopts superheterodyne structure and adopts the secondary frequency conversion mode, and the microwave signal frequency conversion of broadband is to intermediate frequency (70 MHz 10 MHz) and is convenient for subsequent data acquisition level digital signal processing. The three-level filtering improves the sensitivity and effectively solves the problems of stray and interference among frequencies.
Drawings
Fig. 1 is a schematic diagram of the structural communication according to the embodiment of the present invention;
FIG. 2 is a schematic diagram of the connection between the local vibration source and the receiving channel in the embodiment of the present invention;
fig. 3 is a schematic diagram of the power division of the present vibration source in the embodiment of the present invention.
Detailed Description
The invention will be further elucidated with reference to the drawings and the specific embodiments.
As shown in fig. 1-3, the present embodiment is described by taking a Yangtze river maritime direction-finding receiver as an example, where the receiver of the present embodiment includes a first local vibration source, a second local vibration source, and five independent receiving channels for receiving electromagnetic wave signals in different incoming wave directions, and output ends of the first local vibration source and the second local vibration source are respectively connected to each independent receiving channel.
Each independent receiving channel comprises an amplitude limiter for receiving the output signal of the antenna, an attenuator, a first filter, a first mixer, a second filter, a first amplifier, a second mixer, a first switch, a third filter, a fourth filter, a second switch and a second amplifier;
the output end of the amplitude limiter is connected with the input end of the attenuator, the output end of the attenuator is connected with the input end of the first filter, the output end of the first filter is connected with one of the input ends of the first frequency mixer, the output end of the first frequency mixer is connected with the input end of the second filter, the output end of the second filter is connected with the input end of the first amplifier, the output end of the first amplifier is connected with one of the input ends of the second frequency mixer, the output end of the second frequency mixer is connected with the input end of the first switch, the output end of the first switch is respectively connected with the input ends of the third filter and the fourth filter, the output ends of the third filter and the fourth filter are simultaneously connected with the input end of the second switch, and the output end of the second switch is connected with the input end of the;
the output end of the first local vibration source is connected with the other input end of the first frequency mixer, and the output end of the second local vibration source is connected with the other input end of the second frequency mixer.
Preferably, the same clock reference source is adopted by the first local vibration source and the second local vibration source, a first power divider is connected between the clock reference source and the first local vibration source and between the clock reference source and the second local vibration source, the output end of the first local vibration source is divided into five paths by the second power divider and then is respectively connected with the input end of the first mixer of the five independent receiving channels, and the output end of the second local vibration source is divided into five paths by the third power divider and then is respectively connected with the input end of the second mixer of the five independent receiving channels.
Preferably, the antenna input signal frequency range in the present embodiment: 20-3000MHz
Preferably, the limiter in this embodiment uses the RLM-33 of mini-circuits to prevent large signals from being input and burning the subsequent devices.
Preferably, the attenuator in this embodiment is a digitally controlled attenuator, with a dynamic range of 60 dB.
Preferably, the first filter in this embodiment is a low-pass filter implemented by microstrip lines, and has an image rejection function.
Preferably, the first mixer in this embodiment is M2-0218LE-1 from mark-Microwave, which has a wide operating frequency, a large dynamic range and a small noise figure.
Preferably, the second filter in this embodiment is a dielectric filter, the center frequency is 3470MHz, and the bandwidth is ± 15 MHz; good rectangular coefficient and good selection and suppression characteristics.
Preferably, in the embodiment, the first amplifier is the HMC311SC70E from Analog-Device, which has a small noise figure, a high gain and stability.
Preferably, the second mixer adopts ADE-30W of mini-circuits, and the noise coefficient is small.
Preferably, in the embodiment, the first switch and the second switch adopt the HMC194MS8, so that the insertion loss is small, and the control is flexible and convenient.
Preferably, the third filter in this embodiment is a gloomy filter TB0186A with a center frequency of 70MHz and a bandwidth of 20 MHz.
Preferably, the fourth filter in this embodiment is a gloomy filter TB0691A, which has a center frequency of 70MHz and a bandwidth of 1 MHz.
Preferably, ERA-50sm of mini-circuits is adopted as the second amplifier in the embodiment, the noise coefficient is small, and the gain is high.
Preferably, in this embodiment, the first local oscillation source frequency ranges from 3490 to 6470MHz, and the step is 10 MHz. The frequency range of the second vibration source is 3530-3540 MHz, and the step is 1 KHz. The first local vibration source and the second local vibration source adopt the same clock reference source, so that the frequency accuracy is ensured. The clock reference source of the embodiment adopts a constant-temperature crystal oscillator, so that the precision is high and the phase noise is good. The embodiment finally outputs at an intermediate frequency of 70MHz, and different bandwidths of 20MHz and 1MHz can be selected through a switch, so that hardware support is provided for different direction finding algorithms.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications can be made without departing from the principle of the present invention, and these modifications should also be regarded as the protection scope of the present invention.
Claims (7)
1. A Yangtze river maritime direction-finding receiver, characterized in that: the device comprises a first local vibration source, a second local vibration source and five independent receiving channels for receiving electromagnetic wave signals in different incoming wave directions, wherein the output ends of the first local vibration source and the second local vibration source are respectively divided into five independent receiving channels for use; the independent receiving channel comprises an amplitude limiter for receiving the output signal of the antenna, an attenuator, a first filter, a first mixer, a second filter, a first amplifier, a second mixer, a first switch, a third filter, a fourth filter, a second switch and a second amplifier;
the output end of the amplitude limiter is connected with the input end of an attenuator, the output end of the attenuator is connected with the input end of a first filter, the output end of the first filter is connected with the IF input end of a first mixer, the RF output end of the first mixer is connected with the input end of a second filter, the output end of the second filter is connected with the input end of a first amplifier, the output end of the first amplifier is connected with the RF input end of a second mixer, the IF output end of the second mixer is connected with the input end of a first switch, the output end of the first switch is respectively connected with the input ends of a third filter and a fourth filter, the output ends of the third filter and the fourth filter are simultaneously connected with the input end of a second switch, and the output end of the second switch is connected with the input end of a second amplifier;
the output end of the first local vibration source is connected with the LO input end of the first frequency mixer, and the output end of the second local vibration source is connected with the LO input end of the second frequency mixer.
2. The Yangtze river maritime direction-finding receiver of claim 1, wherein: the first local vibration source and the second local vibration source adopt the same clock reference source, a first power divider is connected between the clock reference source and the first local vibration source and between the clock reference source and the second local vibration source, the output end of the first local vibration source is divided into five paths by the second power divider and then is respectively connected with the LO input end of the first frequency mixer of the five paths of independent receiving channels, and the output end of the second local vibration source is divided into five paths by the third power divider and then is respectively connected with the LO input end of the second frequency mixer of the five paths of independent receiving channels.
3. The Yangtze river maritime direction-finding receiver of claim 2, wherein: the limiter employs RLM-33 of mini-circuits.
4. The Yangtze river maritime direction-finding receiver of claim 3, wherein: the first mixer adopts M2-0218LE-1 of Marki-Microwave company.
5. The Yangtze river maritime direction-finding receiver of claim 4, wherein: the second filter adopts a dielectric filter, the center frequency is 3470MHz, and the bandwidth is +/-15 MHz.
6. The Yangtze river maritime direction-finding receiver of claim 5, wherein: the first amplifier employs the HMC311SC70E from Analog-Device.
7. The Yangtze river maritime direction-finding receiver of claim 6, wherein: the second mixer uses ADE-30W from mini-circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021765359.5U CN211656138U (en) | 2020-08-21 | 2020-08-21 | Yangtze river maritime affairs direction finding receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021765359.5U CN211656138U (en) | 2020-08-21 | 2020-08-21 | Yangtze river maritime affairs direction finding receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211656138U true CN211656138U (en) | 2020-10-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021765359.5U Active CN211656138U (en) | 2020-08-21 | 2020-08-21 | Yangtze river maritime affairs direction finding receiver |
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| CN (1) | CN211656138U (en) |
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2020
- 2020-08-21 CN CN202021765359.5U patent/CN211656138U/en active Active
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