Navigation radar integrating two systems of continuous wave and pulse pressure

Abstract

The utility model relates to a navigation radar integrating two systems of continuous wave and pulse pressure, which comprises a receiving antenna, a transmitting antenna, a digital-to-analog converter and an analog-to-digital converter, the digital-to-analog converter is connected with a phase discriminator, the phase discriminator is connected with a PLL loop, the PLL loop is connected with a filter amplifier and the analog-to-digital converter in series, and the filter amplifier is connected with the analog-to-digital converter. The receiving antenna is connected with an amplitude limiter, a signal of the amplitude limiter enters a PLL loop after being subjected to low-noise amplification, the PLL loop is connected with a radio frequency switch, the radio frequency switch is connected with a low-power channel and a high-power channel, and the low-power channel and the high-power channel are both connected with the transmitting antenna; the utility model has the advantage of good detection performance.

Description

Technical Field

[0001] The utility model belongs to the technical field of navigation radars, and in particular relates to a navigation radar integrating two systems, continuous wave and pulse compression. Background Art

[0002] Navigation radar is widely used in the fields of navigation, aviation, transportation, etc. It can help ships and aircraft navigate, avoid collisions, and provide real-time environmental perception and target tracking capabilities. The performance and functions of navigation radar will vary according to different application requirements, such as navigation radar, air traffic control radar and vehicle collision avoidance radar.

[0003] Current navigation radars are mainly divided into several systems, including continuous wave, pulse and pulse compression. Each system has its advantages and disadvantages. Continuous wave radar has low power consumption and strong short-range detection capability, but limited long-range detection performance. The short-range blind spot of pulse compression radar is a fatal problem, which is not very suitable for small boats such as unmanned ships. Therefore, a navigation radar that integrates both continuous wave and pulse compression systems is needed. Summary of the invention

[0004] The utility model aims to overcome the shortcomings of the prior art and provide a navigation radar with integrated continuous wave and pulse compression systems.

[0005] The technical solution of the utility model is as follows:

[0006] A navigation radar integrating continuous wave and pulse compression systems, comprising a receiving antenna, a transmitting antenna, a digital-to-analog converter and an analog-to-digital converter, wherein the digital-to-analog converter is connected to a phase detector, the phase detector is connected to a PLL loop, and the PLL loop is connected in series with a filter amplifier and an analog-to-digital converter;

[0007] The receiving antenna is connected to a limiter, and the signal of the limiter enters the PLL loop after low noise amplification;

[0008] The PLL loop is connected to a radio frequency switch, the radio frequency switch is connected to a low-power channel and a high-power channel, and both the low-power channel and the high-power channel are connected to a transmitting antenna.

[0009] Further, the PLL loop includes a voltage-controlled oscillator connected to the phase detector, a first low-noise amplifier connected to the voltage-controlled oscillator, a second mixer connected to the first low-noise amplifier, a first mixer connected to the voltage-controlled oscillator, and a sound source harmonic local oscillator connected to the first mixer, the first mixer is connected to the phase detector, the second mixer is connected to the limiter and the filter amplifier, and the radio frequency switch is connected to the first low-noise amplifier.

[0010] Furthermore, the limiter is connected to a second low noise amplifier connected to the second mixer.

[0011] Furthermore, the low-power channel includes a third low-noise amplifier, and the third low-noise amplifier is connected to the transmitting antenna.

[0012] Furthermore, the transmission power of the third low noise amplifier is 165 mW.

[0013] Furthermore, the high-power channel includes a pulse frequency modulation device and a power amplifier, and the radio frequency switch, the pulse frequency modulation device, the power amplifier and the transmitting antenna are connected in series.

[0014] Furthermore, the transmission power of the power amplifier is 25W.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model realizes the switching of the two working states of connection wave and pulse pressure through the cooperation of the high-power channel and the low-power channel with the receiving antenna, thereby ensuring the detection performance;

[0017] The utility model adopts the cooperation of voltage-controlled oscillator, harmonic local oscillator of acoustic wave table, first low-noise generator and first mixer to provide local oscillator for receiving antenna, thus ensuring the use;

[0018] In short, the utility model has the advantage of good detection performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] In the figure, 1. digital-to-analog converter, 2. phase detector, 3. voltage-controlled oscillator, 4. first low-noise amplifier, 5. analog-to-digital converter, 6. filter amplifier, 7. second low-noise amplifier, 8. receiving antenna, 9. limiter, 10. radio frequency switch, 11. pulse frequency modulation equipment, 12. power amplifier, 13. transmitting antenna, 14. third low-noise amplifier, 15. SAW harmonic local oscillator, 16. first mixer, and 17. second mixer. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1As shown, a navigation radar integrating continuous wave and pulse compression systems includes a receiving antenna 8, a transmitting antenna 13, a digital-to-analog converter 1 and an analog-to-digital converter 5, the digital-to-analog converter 1 is connected to a phase detector 2, the phase detector 2 is connected to a PLL loop, and the PLL loop is serially connected to a filter amplifier 6 and the analog-to-digital converter 5;

[0023] The receiving antenna 8 is connected to the limiter 9, and the signal of the limiter 9 enters the PLL loop after low noise amplification;

[0024] The PLL loop is connected to a radio frequency switch 10, the radio frequency switch 10 is connected to a low-power channel and a high-power channel, and both the low-power channel and the high-power channel are connected to a transmitting antenna 13;

[0025] When in the continuous wave working state, the digital-to-analog converter 1 modulates the continuous wave signal as a reference and sends it to the phase detector 2. The phase detector 2 sends the continuous wave signal to the PLL loop to output the frequency modulation signal of the X band. At this time, the RF switch 10 switches to a low-power channel. On this basis, the signal is transmitted through the low-power channel and the transmitting antenna 13, and the signal to be received is received by the receiving antenna 8 and then transmitted to the limiter 9. When the signal received by the receiving antenna 8 is greater than 10dbm, the limiter 9 is started to attenuate the signal. The signal passing through the limiter 9 enters the PLL loop and the filter amplifier 6 and enters the analog-to-digital converter 5 after low-noise amplification, thereby realizing the reception and transmission of the connecting wave;

[0026] When in the pulse compression working state, the transmission and reception are carried out in time periods within a cycle. During the transmission period, the digital-to-analog converter 1 outputs a frequency-modulated pulse signal. At this time, the receiving antenna 8 no longer works, and the RF switch 10 switches to a high-power channel. The high-power channel sends the frequency-modulated pulse signal to the receiving antenna 8. The receiving antenna 8 sends a frequency-modulated pulse signal. When the signal transmission is completed, the transmission channel is closed, and the digital-to-analog converter 1 outputs a fixed frequency signal to enter the PLL loop. At this time, the PLL loop outputs a fixed RF signal as the local oscillator of the receiving antenna 8. The signal received by the receiving antenna 8 enters the PLL loop after the limiter 9 and low-noise amplification. The PLL loop mixes the local oscillator with the received signal to obtain an intermediate frequency signal, which then passes through the filter amplifier 6 and enters the analog-to-digital converter 5. The analog-to-digital converter 5 sends the signal to other devices for signal processing, thereby completing the reception, and then the above process is repeated.

[0027] In this embodiment, the PLL loop includes a voltage controlled oscillator 3 connected to the phase detector 2, a first low noise amplifier 4 connected to the voltage controlled oscillator 3, a second mixer 17 connected to the first low noise amplifier 4, a first mixer 16 connected to the voltage controlled oscillator 3, and a sound surface harmonic local oscillator 15 connected to the first mixer 16. The first mixer 16 is connected to the phase detector 2, the second mixer 17 is connected to the limiter 9 and the filter amplifier 6, and the radio frequency switch 10 is connected to the first low noise amplifier 4. When in use, when working in a high-power channel, the voltage controlled oscillator 3 outputs a fixed radio frequency signal as the local oscillator of the receiving antenna 8, and when working in a low-power channel, the low noise amplification processed by the first low noise amplifier 4 is used as the local oscillator of the receiving antenna 8. Feedback is provided to the phase detector 2 through the first mixer 16 and the sound surface harmonic local oscillator 15, thereby realizing the function of a phase-locked loop. The phase-locked loop can realize functions such as frequency tracking, phase synchronization and noise suppression of the input signal, so that the output signal has stable frequency and phase characteristics.

[0028] In this embodiment, the limiter 9 is connected to a second low noise amplifier 7 connected to the second mixer 17, and low noise amplification is achieved by the second low noise amplifier 7 to ensure use.

[0029] In this embodiment, the low-power channel includes a third low-noise amplifier 14 , and the third low-noise amplifier 14 is connected to the transmitting antenna 13 .

[0030] In this embodiment, the transmission power of the third low noise amplifier 14 is 165 mW;

[0031] In this embodiment, the high-power channel includes a pulse frequency modulation device 11 and a power amplifier 12, and the RF switch 10, the pulse frequency modulation device 11, the power amplifier 12 and the transmitting antenna 13 are connected in series, wherein the pulse frequency modulation device 11 is composed of a pulse frequency modulation transmitter and a pulse frequency modulation receiver, wherein the pulse frequency modulation transmitter and the pulse frequency modulation receiver are prior arts, and therefore will not be described in detail.

[0032] In this embodiment, the transmission power of the power amplifier 12 is 25W.

[0033] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. 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. A navigation radar integrating continuous wave and pulse compression systems, characterized in that: It includes a receiving antenna, a transmitting antenna, a digital-to-analog converter and an analog-to-digital converter, wherein the digital-to-analog converter is connected to a phase detector, the phase detector is connected to a PLL loop, and the PLL loop is connected in series with a filter amplifier and an analog-to-digital converter; The receiving antenna is connected to a limiter, and the signal of the limiter enters the PLL loop after low noise amplification; The PLL loop is connected to a radio frequency switch, the radio frequency switch is connected to a low-power channel and a high-power channel, and both the low-power channel and the high-power channel are connected to a transmitting antenna.

2. The navigation radar integrating continuous wave and pulse compression systems according to claim 1, characterized in that: The PLL loop includes a voltage-controlled oscillator connected to the phase detector, a first low-noise amplifier connected to the voltage-controlled oscillator, a second mixer connected to the first low-noise amplifier, a first mixer connected to the voltage-controlled oscillator, and a sound source harmonic local oscillator connected to the first mixer, the first mixer is connected to the phase detector, the second mixer is connected to a limiter and a filter amplifier, and the radio frequency switch is connected to the first low-noise amplifier.

3. The navigation radar integrating continuous wave and pulse compression systems according to claim 2 is characterized in that: The limiter is connected to a second low noise amplifier connected to a second mixer.

4. The navigation radar integrating continuous wave and pulse compression systems according to claim 1, characterized in that: The low-power channel includes a third low-noise amplifier, and the third low-noise amplifier is connected to the transmitting antenna.

5. The navigation radar integrating continuous wave and pulse compression systems according to claim 4 is characterized in that: The transmission power of the third low noise amplifier is 165mW.

6. The navigation radar integrating continuous wave and pulse compression systems according to claim 1, characterized in that: The high-power channel includes a pulse frequency modulation device and a power amplifier, and the radio frequency switch, the pulse frequency modulation device, the power amplifier and the transmitting antenna are connected in series.

7. The navigation radar integrating continuous wave and pulse compression systems according to claim 6 is characterized in that: The transmission power of the power amplifier is 25W.

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