Single transmitter concurrent scanning system and method for new hazard radar beacon

Abstract

The present invention discloses a single-transmitter concurrent scanning system for a new hazardous radar beacon, comprising a transponder receiver device, a transponder transmitter device and an antenna transceiver duplexer, wherein the transponder receiver device comprises a small signal amplification module and a pulse detection module connected to the signal of the small signal amplification module, the transponder transmitter device comprises a scanning oscillator for forming a local oscillation spectrum and an amplitude modulator and a fixed-frequency oscillator connected to the signal of the scanning oscillator, and also comprises a power amplification module connected to the output end of the amplitude modulator. The present invention adopts subcarrier oscillation, subcarrier amplitude modulation and other means to realize the transformation from a single spectrum line slow scanning local oscillation spectrum to three oscillation spectrum parallel slow scanning, so that the original single-channel transmitter can be used to simultaneously transmit three oscillation spectrum lines to scan and respond, thereby realizing the 300MHz full-band scanning coverage specified in the standard with one-third of the scanning time, and realizing the performance improvement at the lowest cost.

Description

Technical Field

[0001] The present invention relates to the field of new dangerous object radar beacons, and in particular to a single-transmitter concurrent scanning system and method for new dangerous object radar beacons. Background Art

[0002] The new dangerous object beacon is a kind of marine aid to navigation equipment specified by the national standard GB4696-1999 "Water Aids to Navigation in China's Sea Areas" and the international standard ITU-RM.824-3 "Technical Parameters of Radar Beacons". It is used by navigation mark management authorities to mark newly discovered obstacles and dangerous areas that will seriously endanger the navigation safety of ships. The new dangerous object radar beacon adopts a variety of technical means such as patterns, visible light and radar beacons. The reply signal emitted by the radar beacon begins with a long "dash" followed by the Morse code "D". The reply signal displays an image equivalent to 1n mile in length on the radar screen. The image is a long dash + Morse signal "D" (——··).

[0003] According to the above standards and specifications, the main technical indicators of the new hazardous radar beacon are as follows:

[0004] Frequency range: 9200MHz~9500MHz

[0005] Polarization: horizontal polarization

[0006] Response signal format: Morse code "D" starting with a stroke Equivalent isotropic radiated power: ≥400mW (+26dBm)

[0007] Receiving sensitivity: When the interrogation radar pulse width is greater than 400ns, it is better than -50dBm; when the interrogation radar pulse width is less than or equal to 100ns, it is better than -37dBm,

[0008] Recovery time after excitation: <25us.

[0009] Delay time from receiving radar signal to starting transmission: <0.5us.

[0010] antenna:

[0011] Polarization: horizontal polarization

[0012] Horizontal 360° gain: 6dB±2dB

[0013] Vertical angle: ≥±12.5°

[0014] Operating range: 5 nautical miles

[0015] Detection probability: ≥50% (3 times / minute)

[0016] The standard recommends two typical technical implementation solutions, such asFigure 4 As shown, one of the implementation schemes is the scanning response type. After receiving the navigation radar pulse, the new dangerous object radar beacon does not identify the radar operating frequency, but instead responds with a slow frequency scanning transmitter. When the real-time transmission frequency of the beacon transmitter sweeps across the navigation radar operating frequency band, the specified response pattern can be obtained on the radar display screen.

[0017] like Figure 5 As shown in the figure, the second implementation scheme of the new hazardous radar beacon is the instantaneous frequency measurement-frequency agility working mode. After receiving the navigation radar pulse, the beacon performs single pulse frequency measurement, and sets the working frequency of the transponder transmitter to the same frequency as the navigation radar according to the frequency measurement result. In this way, the reply signal can be received by the navigation radar immediately, and there is no need to wait for a time delay in the frequency scanning working mode. In addition, the display of the reply signal is continuous, and it will not disappear due to the frequency scanning away from the working bandwidth of the navigation radar like the first method, and it will need to wait for a time period to appear again.

[0018] As mentioned above, there are two recommended technical implementation schemes for the new hazardous object radar beacon. The first scheme has simple equipment composition, easy implementation, reliable operation and low cost, but there is an intermittent response signal, which requires the navigation ship driver to concentrate on staring at the navigation radar display for a long time to observe the existence of hazardous objects, which is easy to cause navigation safety accidents due to negligence. The second scheme adopts instantaneous frequency measurement technology to overcome the shortcomings of the first scheme. The hazardous object response indication signal "permanently" appears on the navigation radar display screen, which is easy to be discovered by the ship driver in time, and has an obvious effect on avoiding navigation accidents. However, it has the disadvantages of complex equipment composition, high technical difficulty, difficulty in manufacturing and maintenance, and high cost, which is not conducive to large-scale promotion. Summary of the invention

[0019] The technical problem solved by the present invention is to provide a single-transmitter concurrent scanning system for new dangerous object radar beacons which has a simple structure and reduces the signal appearance period.

[0020] The technical solution adopted by the present invention to solve the technical problem is: a single transmitter concurrent scanning system for a new dangerous object radar beacon, comprising a transponder receiver device, a transponder transmitter device and an antenna transceiver duplexer, wherein the transponder receiver device, the transponder transmitter device and the antenna transceiver duplexer are communicatively connected;

[0021] The transponder receiver device includes a small signal amplification module and a pulse detection module connected to the small signal amplification module signal;

[0022] The transponder transmitter device includes a scanning oscillator for forming a local oscillation spectrum, a fixed frequency oscillator for mixing with the scanning oscillator signal to generate an upper sideband spectrum and a lower sideband spectrum with the same height as the local oscillation spectrum, an amplitude modulator for realizing the aforementioned mixing function, and also includes a power amplification module connected to the output end of the amplitude modulator.

[0023] Furthermore, the fixed-frequency oscillator is a 100 MHz fixed-frequency oscillator.

[0024] Furthermore, the frequency scanning range of the local oscillation spectrum is 9300-9400 MHz.

[0025] Furthermore, the transponder receiver device, the transponder transmitter device and the antenna transceiver duplexer are all arranged in a multi-cavity metal shell.

[0026] The present invention also discloses a single-transmitter concurrent scanning method for a scanning new dangerous object radar beacon, comprising the above-mentioned single-transmitter concurrent scanning system for a scanning new dangerous object radar beacon, and the steps are: after the beacon receives a navigation radar pulse, a scanning oscillator generates a local oscillation spectrum of 9300-9400 MHz, the local oscillation spectrum is mixed with an amplitude modulator and a 100 MHz subcarrier oscillator to form an upper sideband spectrum and a lower sideband spectrum of the same height as the local oscillation spectrum, and the local oscillation spectrum of 9300-9400 MHz, the lower sideband spectrum of 9200-9300 MHz and the upper sideband spectrum of 9400-9500 MHz generated by mixing are amplified by a power amplifier module and then synchronously emitted through an antenna transceiver duplexer.

[0027] The beneficial effect of the present invention is that the present invention innovatively introduces communication signal processing means into the field of radar (response) signal processing technology, and adopts subcarrier oscillation, subcarrier amplitude modulation and other means to realize the transformation of single-line slow scanning local oscillation spectrum to three oscillation spectrum parallel slow scanning, so that the original single-channel transmitter can be used to simultaneously transmit three oscillation spectrum lines to scan the response, thereby realizing the 300MHz full-band scanning coverage specified by the standard with one-third of the scanning time, and realizing performance improvement with minimal increase in equipment complexity and lowest cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a principle block diagram of a single transmitter concurrent scanning system for a scanning new hazardous object radar beacon according to an embodiment of the present application.

[0029] Figure 2 This is a diagram of a practical implementation of a single-transmitter concurrent scanning system for a scanning new hazardous object radar beacon according to an embodiment of the present application.

[0030] Figure 3 It is a schematic diagram of working waveforms of an embodiment during specific working.

[0031] Figure 4 It is a schematic diagram of the first technical solution in the background technology.

[0032] Figure 5 It is a schematic diagram of the second technical solution in the background technology.

[0033] Figure 6 This is the operating waveform diagram of a conventional frequency agile radar beacon. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0037] like Figure 1 to Figure 2 As shown, the embodiment of the present application discloses a single-transmitter concurrent scanning system for a scanning new dangerous object radar beacon, including a transponder receiver device, a transponder transmitter device and an antenna transceiver duplexer, wherein the transponder receiver device, the transponder transmitter device and the antenna transceiver duplexer are communicatively connected;

[0038] The transponder receiver device includes a small signal amplification module and a pulse detection module connected to the small signal amplification module signal;

[0039] The transponder transmitter device includes a scanning oscillator for forming a local oscillation spectrum, a fixed frequency oscillator for mixing with the scanning oscillator signal to generate an upper sideband spectrum and a lower sideband spectrum with the same height as the local oscillation spectrum, an amplitude modulator for realizing the aforementioned mixing function, and also includes a power amplification module connected to the output end of the amplitude modulator.

[0040] Specifically, the fixed-frequency oscillator is a 100 MHz fixed-frequency oscillator, and the frequency scanning range of the local oscillation spectrum is 9300-9400 MHz.

[0041] It should be explained that: this device is used for new dangerous object radar beacon, which is composed of waveguide slot antenna, beacon transceiver assembly, battery pack and other components, and a flashing beacon is set on the top according to the standard. The technical subject of the present invention is inside the beacon transceiver assembly.

[0042] The specific working principle is as follows: after the beacon receives the navigation radar pulse, the small signal amplification module first amplifies the signal, and then the pulse detection module detects the pulse amplitude of the signal. When a navigation pulse exceeding the preset threshold is received, the reply transmission process is started, that is, a reply code "D" (——··) starting with a long "dash" is generated, and a trigger signal is output to the slow scanning oscillator at the same time. The slow scanning oscillator generates a local oscillation spectrum of 9300~9400MHz, and then the local oscillation spectrum is mixed with the amplitude modulator and the fixed frequency oscillator to generate an upper sideband spectrum and a lower sideband spectrum of the same height as the local oscillation spectrum. The local oscillation spectrum of 9300~9400MHz, the lower sideband spectrum of 9200~9300MHz and the upper sideband spectrum of 9400~9500MHz are amplified by the power amplifier module and carry the generated reply code "D" (——··) starting with a long "dash" and are synchronously sent out through the antenna transceiver duplexer. When the above spectrum sweeps over the operating frequency of the navigation radar receiver, the dangerous goods mark signal specified in the standard will appear on the navigation radar display, thereby playing a warning role.

[0043] Figure 6 Shown is the operating waveform of a conventional frequency agile radar beacon, which is explained as follows:

[0044] Diagram A is "radar transmission", which means the navigation radar signal received by the beacon, which is a periodic negative pulse sequence.

[0045] Figure B is "beacon reply", which means the reply signal emitted by the beacon under the trigger of the received navigation radar signal. It is a sequence of two long and two short pulse strings. The first long "dash" indicates the beginning of the reply signal, and the second long "dash" and the following two short "dashes" form the Morse code "D".

[0046] Figure C is the "response frequency", which represents the instantaneous carrier frequency of the response signal emitted by the beacon. It slowly scans from 9.2 GHz to 9.5 GHz in a cycle of 60 seconds, and then repeats.

[0047] Diagram D is "radar reception", which means the response signal transmitted by the beacon and received by the navigation radar. Since the beacon transmission frequency changes slowly, only the response pulse that falls within the navigation radar receiver band can be received. Therefore, the navigation radar can only receive the beacon response for about 2 to 4 seconds in every 60-second cycle.

[0048] Figure E is the "radar display", which shows the display waveform obtained on the navigation radar display. The beacon's reply signal can be seen for 2 to 4 seconds in every 60-second cycle.

[0049] The specific implementation details can be found in Figure 3 As shown:

[0050] Figure A, “Radar Transmission”, shows the navigation radar signal received by the beacon, which is a periodic negative pulse sequence.

[0051] Figure B is "beacon response", which means the response signal emitted by the beacon under the trigger of the received navigation radar signal. It is a sequence of two long and two short pulse strings. The first long "dash" indicates the beginning of the response signal, and the second long "dash" and the following two short "dashes" form the Morse code "D".

[0052] Figure C is the "response frequency", which represents the instantaneous carrier frequency of the response signal emitted by the beacon. Here, the 9.2GHz~9.5GHz frequency band is divided into three sub-bands, which are scanned concurrently with a period of 20 seconds.

[0053] Diagram D stands for "radar reception", which means the response signal received by the navigation radar and transmitted by the beacon. Figure 6 The difference is that the navigation radar receives the beacon response for about 2 to 4 seconds every 20 seconds instead of 60 seconds.

[0054] Figure E is the "radar display", which shows the display waveform obtained on the navigation radar display. The beacon's reply signal can be seen for 2 to 4 seconds every 20 seconds instead of 60 seconds.

[0055] from Figure 3 and Figure 6 From the comparison, it can be seen that this technical solution shortens the full-band scanning time from 60 seconds to 20 seconds, so that the beacon's response signal can be seen for 2 to 4 seconds in every 20-second cycle, greatly enhancing the safety performance.

[0056] The above system divides the 300MHz frequency scanning range into three sub-bands, each with 100MHz. The new hazardous radar beacon transponder transmitter simultaneously transmits and scans on the three sub-bands, keeping the slow scanning rate of 5MHz / S unchanged. In this way, it only takes one-third of the original scanning cycle of 60S to complete the entire 300MHz scanning range, that is, it can be guaranteed to scan the operating frequency of the navigation radar receiver once every 20S, thereby ensuring that the standard hazardous sign signal appears on the navigation radar display once every 20 seconds instead of every 60 seconds. The frequency of warning signals appearing on the navigation radar is increased by three times, making it easier for ship drivers to find and avoid in time to ensure navigation safety.

[0057] At the same time, this solution cleverly introduces the amplitude modulation method commonly used in the field of communication signal processing technology, converts the single-line signal output by the slow-scan oscillator into a three-line signal, which can then be amplified and transmitted through the original single-channel transmitter. Compared with the original principle block diagram of the present invention, two concurrent transmission channels are omitted, which effectively avoids the increase in the complexity of the equipment structure, and is conducive to increasing equipment reliability and cost control.

[0058] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Single transmitter concurrent scanning system for new hazard beacons, characterized by: It includes a transponder receiver device, a transponder transmitter device and an antenna transceiver duplexer, wherein the transponder receiver device, the transponder transmitter device and the antenna transceiver duplexer are communicatively connected; The transponder receiver device includes a small signal amplification module and a pulse detection module connected to the small signal amplification module signal; The transponder transmitter device includes a scanning oscillator for forming a local oscillation spectrum, a fixed frequency oscillator for mixing with the scanning oscillator signal to generate an upper sideband spectrum and a lower sideband spectrum of the same height as the local oscillation spectrum, an amplitude modulator for realizing the aforementioned mixing function, and a power amplifier module connected to the output end of the amplitude modulator. The scanning method is: After the beacon receives the navigation radar pulse, the scanning oscillator generates a local oscillation spectrum of 9300-9400 MHz. The local oscillation spectrum is mixed with the spectrum generated by the fixed-frequency oscillator in the amplitude modulator to generate an upper sideband spectrum and a lower sideband spectrum of the same height as the local oscillation spectrum. The local oscillation spectrum of 9300-9400 MHz, the lower sideband spectrum of 9200-9300 MHz and the upper sideband spectrum of 9400-9500 MHz are amplified by the power amplifier module and output to the antenna through the duplexer.

2. The single transmitter concurrent scanning system for new hazardous beacons as claimed in claim 1, characterized in that: The fixed frequency oscillator is a 100 MHz fixed frequency oscillator.

3. The single transmitter concurrent scanning system for new hazardous beacons as claimed in claim 1, characterized in that: The frequency scanning range of the local oscillation spectrum is 9300-9400 MHz.

4. The single transmitter concurrent scanning system for new hazardous beacons as claimed in claim 1, characterized in that: The transponder receiver device, the transponder transmitter device and the antenna transceiver duplexer are all arranged in a multi-cavity metal shell.

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