Pulse system radar receiver debugging platform

Abstract

The utility model provides a pulse system radar receiver debugging platform which comprises a microwave signal source, an oscilloscope and a power divider. An output frequency signal of the first microwave signal source is divided into a sum signal, an azimuth difference signal and a pitch difference signal through a power divider in three paths, and the sum signal, the azimuth difference signal and the pitch difference signal are input into corresponding input channels of a sum path, an azimuth path and a high-low path of the receiver to be tested through cables; the second microwave signal source and the third microwave signal source are connected with the receiver to be tested to serve as a first local oscillator, and the second local oscillator is connected to the receiver to be tested; connecting a frequency spectrograph with at least one output interface of a sum path, an azimuth path and a high-low path of the receiver to be tested so as to acquire an output value; or the oscilloscope is respectively connected with the output interfaces of the sum path, the azimuth path and the high-low path of the receiver to be tested so as to acquire the output value. When the dual-plane sum-difference monopulse radar receiver debugging platform is used for debugging a dual-plane sum-difference monopulse radar receiver, the platform is designed in a modularized manner, the operation is simple, and the carrying is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of dual-plane monopulse radar, and particularly relates to a debugging platform for a pulse system radar receiver. Background Art

[0002] The sum-difference three-channel receiver of the dual-plane monopulse radar is the key to realizing the angle measurement and altitude measurement technologies of the monopulse radar. The isolation, gain, noise figure (which directly determines the receiver sensitivity), phase, image rejection, dynamic range, etc. consistency among the three receiving channels determines the angle measurement accuracy of the radar to capture targets. Therefore, high requirements are put forward for the consistency of the three channels (sum, variance, pitch) of the receiver. Therefore, the maintenance and debugging of the dual-plane monopulse radar receiver are complex, the detection is complex, and it is not easy to maintain. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is how to quickly and conveniently realize the debugging of parameters such as the noise figure, dynamic range, phase consistency, gain, etc. of the three-channel receiver of the dual-plane sum-difference monopulse radar and the equipment maintenance. In view of this, the utility model provides a debugging platform for a pulse system radar receiver.

[0004] The technical solution adopted by the utility model is a debugging platform for a pulse system radar receiver, including:

[0005] A first microwave signal source, a second microwave signal source, a third microwave signal source, and a power divider;

[0006] The output frequency signal of the first microwave signal source is divided into three paths by the power divider, namely a sum signal, an azimuth difference signal, and an elevation difference signal, and is input into the corresponding sum path, azimuth path, and elevation path input channels of the receiver to be tested through cables;

[0007] The second microwave signal source is connected to the receiver to be tested and serves as a first local oscillator to be connected to the receiver to be tested;

[0008] The third microwave signal source is connected to the receiver to be tested and serves as a second local oscillator to be connected to the receiver to be tested;

[0009] Connect the spectrum analyzer to at least one output interface of the sum path, azimuth path, and elevation path of the receiver to be tested to obtain the output value; or connect the oscilloscope to the output interfaces of the sum path, azimuth path, and elevation path of the receiver to be tested respectively to obtain the output value.

[0010] In one embodiment, the platform further includes a power supply device, specifically a DC regulated power supply with a preset voltage condition, and the power supply for the debugging platform of the pulse system radar receiver and the receiver to be tested is realized through a signal distribution box.

[0011] In one embodiment, the platform further includes a noise meter, which is respectively connected to the input channels and output channels of the sum path, azimuth path, and elevation path of the receiver to be measured.

[0012] In one embodiment, the insertion losses of the three channels of the power divider are the same, and the insertion losses of the cables used to connect different channels to the power divider are the same.

[0013] This article can debug the dynamic range, noise figure, channel gain, channel phase, etc. of a dual-channel monopulse radar receiver, and can debug, test, and repair the main parameters of a dual-plane monopulse radar receiver. It has the characteristics of miniaturization, modularization, portability, and simple operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a block diagram of the three-channel receiver of a dual-plane sum-difference monopulse radar;

[0015] Figure 2 It is a schematic diagram of the composition of a debugging platform for a pulse-mode radar receiver according to an embodiment of the present invention;

[0016] Figure 3 It is a block diagram of the noise figure debugging of a pulse-mode three-channel radar receiver according to an embodiment of the present invention;

[0017] Figure 4 It is a block diagram of the phase debugging of the receiving channels of a pulse-mode three-channel radar receiver according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined purpose, the present invention will be described in detail as follows with reference to the accompanying drawings and preferred embodiments.

[0019] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0020] In addition, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0021] It should be noted that this application is mainly applicable to the debugging work of a dual-plane sum-difference monopulse radar receiver. The block diagram of the dual-plane sum-difference monopulse radar receiver can be seen inFigure 1 shown.

[0022] Among them, the dual-plane sum-difference monopulse radar receiver includes a sum-difference three-channel limiter, a low-noise high-frequency amplifier, a filter, a mixer, an intermediate frequency amplifier, a phase detector, etc. The following is an overview of the working process:

[0023] The three-way Σ, Δ1, Δ2 radio frequency signals RF obtained from the antenna and the difference comparator are mixed with the first local oscillator signal L01 obtained by the limiter, the low-noise high-frequency mixing amplifier and the frequency synthesizer, and down-converted to the high-intermediate frequency signal HIF signal, and then passed through the filter and the second local oscillator L02 to the intermediate frequency IF signal, and then passed through the intermediate frequency main intermediate amplifier to output the three-way Σo, Δ1, Δ2 IF signals respectively.

[0024] The three IF signals of Σo, Δ1, and Δ2 are sent to the orthogonal phase detector: the intermediate frequency signal filtered and amplified by the receiver is down-converted for the last time, and the actual angle error and distance signal are extracted (the orthogonal dual-channel method of 90-degree phase shift of the reference signal is adopted to overcome the "blind phase"), thereby improving the angle measurement accuracy of the target. For fixed targets, a series of equal-amplitude pulses are output; for moving targets, due to the Doppler effect, the phase difference between the echo signal and the transmitted signal changes with time, so a series of amplitude modulated pulses are output, and the orthogonal dual-channel method is generally used to shift the phase of the reference signal. A total of 6 I and Q signals are sent to the A / D combination for analog-to-digital conversion, and finally sent to the back-end for processing.

[0025] The utility model embodiment is a pulse radar receiver debugging platform, such as Figures 2 to 4 As shown, it includes: a first microwave signal source, a second microwave signal source, a third microwave signal source, and a power divider;

[0026] The output frequency signal of the first microwave signal source is split into three paths through the power divider, namely, a sum signal, an azimuth difference signal and an elevation difference signal, and is input into the corresponding sum path, azimuth path, elevation path and elevation path input channels of the receiver to be tested through cables;

[0027] A second microwave signal source is connected to the receiver under test and connected to the receiver under test as a local oscillator;

[0028] A third microwave signal source is connected to the receiver under test and connected to the receiver under test as a second local oscillator;

[0029] Connect a spectrum analyzer to at least one output interface of the sum path, azimuth path, and high and low paths of the receiver under test to obtain output values; or connect an oscilloscope to the output interfaces of the sum path, azimuth path, and high and low paths of the receiver under test respectively to obtain output values.

[0030] In this embodiment, the platform also includes a power supply device, specifically a DC regulated power supply with a preset voltage condition, which supplies power to the pulse radar receiver debugging platform and the receiver to be tested through a signal distribution box.

[0031] In this embodiment, the platform further includes a noise meter, which is connected to the input channels and output channels of the sum path, azimuth path, high and low paths of the receiver to be tested respectively.

[0032] In this embodiment, the three channels of the power splitter have the same insertion loss, and the insertion loss of cables used to connect different channels to the power splitter is the same.

[0033] The platform provided in this application can be used at least for:

[0034] (1) The connection method for the gain test of the receiver's Σ and channel and Δ1 azimuth difference channel and Δ2 high-low difference channel is as follows: the output of signal source 1 is connected to cable a, the other end of cable a is connected to the input port of the three-way power divider, and the three output ports of the power divider are connected to cables a1, a2, and a3 in sequence. The other end of cable a1 is connected to the input end of the receiver's Σ and channel, the other end of cable a2 is connected to the input end of the Δ1 azimuth difference channel, and the other end of cable a3 is connected to the input end of the Δ2 high-low difference channel; the output port of microwave signal source 2 is connected to the input end of the receiver's local oscillator through cable b1, and the output port of microwave signal source 3 is connected to the input end of the receiver's second local oscillator through cable b2; one end of cable c is connected to the spectrum analyzer, and the other end is first connected to the receiver's sum channel output Σo to measure the sum channel output amplitude, then connected to the azimuth difference channel output to measure the azimuth difference channel amplitude output, and finally connected to the high-low difference channel output to measure the high-low difference channel output amplitude.

[0035] (2) The connection method for the phase test of the receiver's Σ and channel and the Δ1 azimuth difference channel and the Δ2 high-low difference channel is as follows: the output ports of the receiver's Σ and channel, Δ1 azimuth difference channel, and Δ2 high-low difference channel are connected to one end of cables d, e, and f respectively, and the other ports are connected to the test ports of the oscilloscope's CH1, CH2, and CH3 channels respectively.

[0036] (3) The connection method for the noise coefficient test of the receiver's Σ and channel and the Δ1 azimuth difference channel and the Δ2 height difference channel is as follows: the output port of the noise meter is connected to the echo input terminal Σ of the receiver and channel through cable g, and the input port of the noise meter is connected to the intermediate frequency output terminal Σo of the receiver and channel through cable g1.

[0037] The measurement connection method for the noise coefficient of the Δ1 azimuth difference channel of the receiver is as follows: the output port of the noise meter is connected to the echo input terminal Δ1 of the azimuth difference channel of the receiver through cable g, and the input port of the noise meter is connected to the intermediate frequency output terminal of the azimuth difference channel of the receiver through cable g1.

[0038] The measurement connection method for the Δ2 altitude difference channel noise figure of the receiver is as follows: The output port of the noise meter is connected to the echo input end Δ2 of the receiver's altitude difference channel through cable g, and the input port of the noise meter is connected to the intermediate frequency output end of the receiver's altitude difference channel through cable g1.

[0039] (4) The measurement method for the dynamic range of the receiver is as follows:

[0040] Increase the amplitude of the signal source output step by step at 1 dBm from -110 dBm to -90 dBm and from -30 dBm to 0 dBm, and increase it step by step at 1 dBm from -90 dBm to -30 dBm. Record the minimum amplitude of the Σ and channel output IF intermediate frequency signals, and the maximum amplitude when the output IF intermediate frequency signal saturates, which is the dynamic range of the receiver channel.

[0041] For the sake of easy understanding, specific embodiments of the above technical solutions are provided below in conjunction with the accompanying drawings.

[0042] Among them, as Figure 2 shown is the debugging block diagram for the gains and dynamic ranges of the Σ, Δ1, and Δ2 channels of the receiver.

[0043] (1) Debugging steps for channel gain consistency test:

[0044] a. Channel gain measurement method: Connect the cables, instruments, and the receiver under test as Figure 2 required.

[0045] b. Turn on the instruments and set the parameters. Set the output frequency of signal source 1 to RF and the power level to a continuous wave signal of -60 dBm as the simulated RF echo signal. After passing through a three-way power divider, it is respectively input into the sum channel, azimuth difference channel, and elevation difference channel of the receiver. Set the frequency of signal source 2 to L01 as the first local oscillator connected to the receiver, and set the frequency of signal source 3 to L02 as the second local oscillator signal connected to the receiver;

[0046] c. Connect the sum output of the receiver to the spectrum analyzer. The amplitude value of the spectrum analyzer's IF is the receiver gain value of the sum channel, read and record it;

[0047] d. Move cable c to the output position of the receiver's azimuth path, that is, connect the spectrum analyzer to the output of the azimuth path receiver. The amplitude value of the spectrum analyzer's IF is the receiver gain value of the azimuth path channel, read and record it;

[0048] e. Move cable c to the output position of the receiver's altitude path, that is, connect the spectrum analyzer to the output of the altitude path receiver. The amplitude value of the spectrum analyzer's IF is the receiver gain value of the altitude path channel, read and record it.

[0049] (2) Debugging steps for dynamic range test:

[0050] Increase the amplitude output from the signal source in steps of 1 dBm between -110 dBm and -90 dBm, -30 dBm and 0 dBm, and in steps of 1 dBm between -90 dBm and -30 dBm. Record the input signal amplitude when the Σ and the channel output IF intermediate frequency signal are at the minimum, and the maximum input signal amplitude when the IF intermediate frequency signal is saturated. This is the dynamic range of the receiver channel.

[0051] As Figure 3 shown is the debugging block diagram of the noise coefficient of the three channels.

[0052] a. Connect the instruments as Figure 3 follows, that is, connect the noise meter to the input channels and output channels of the sum path, azimuth path, and elevation path of the receiver to be measured respectively;

[0053] b. Connect the output of the noise meter to the input end of the Σ and channel of the receiver through cable g, and connect the input port of the noise source to the output end of the sum channel of the receiver through cable g1. Record the noise coefficient reading of the noise meter, which is the noise coefficient of the sum channel;

[0054] c. Connect the output of the noise meter to the input end of the Δ1 azimuth difference channel of the receiver through cable g, and connect the input of the noise source to the output end of the azimuth difference channel of the receiver through cable g1. Record the noise coefficient reading of the noise meter, which is the noise coefficient of the azimuth difference channel;

[0055] d. Connect the output of the noise source to the input end of the Δ2 elevation difference channel of the receiver through cable g, and connect the input of the noise source to the output end of the elevation difference channel of the receiver through cable g1. Record the noise coefficient reading of the noise meter, which is the noise coefficient of the elevation difference channel.

[0056] As Figure 4 shown is the debugging block diagram of the phase consistency of the three channels.

[0057] a. Connect the instruments as Figure 4 follows, that is, connect the oscilloscope to the output interfaces of the sum path, azimuth path, and elevation path of the receiver to be measured respectively to obtain the output values;

[0058] b. Connect the output ports of the Σ and channel, Δ1 azimuth difference channel, and Δ2 elevation difference channel of the receiver to one end of cables d, e, and f respectively, and the other ends are connected to the test ports of channels CH1, CH2, and CH3 of the oscilloscope respectively. Use the Σ and channel corresponding to CH1 of the oscilloscope as the trigger source for synchronization, and test the phase difference between the output waveforms of the Δ1 azimuth difference channel and the Δ2 elevation difference channel within one cycle of the IF of the sum path channel. The phase difference between the waveforms corresponding to CH1 and CH2, CH3 of the oscilloscope is the phase between the sum channel and the azimuth difference channel, and between the sum channel and the elevation difference channel.

[0059] In summary, compared with the prior art, the present application has at least the following advantages:

[0060] 1) When debugging the dual-plane sum-difference monopulse radar receiver, the platform built in the present application is modularly designed, with simple operation and easy to carry;

[0061] 2) The present application can efficiently, quickly and safely complete the debugging, inspection and maintenance of key parameters such as the noise figure, gain consistency, dynamic range, and phase consistency of the radar receiver.

[0062] Through the description of the specific implementation manners, it should be possible to have a more in-depth and specific understanding of the technical means and effects adopted by the present utility model to achieve the predetermined purpose. However, the accompanying drawings are only for reference and illustration, and are not used to limit the present utility model.

Claims

1. A pulse radar receiver debugging platform, characterized in that: include: A first microwave signal source, a second microwave signal source, a third microwave signal source, an oscilloscope, and a power divider; The output frequency signal of the first microwave signal source is split into three paths through the power divider, namely, a sum signal, an azimuth difference signal and an elevation difference signal, and is input into the corresponding sum path, azimuth path, elevation path and elevation path input channels of the receiver to be tested through cables; The second microwave signal source is connected to the receiver under test and connected to the receiver under test as a local oscillator; The third microwave signal source is connected to the receiver under test and connected to the receiver under test as a second local oscillator; Connecting the spectrum analyzer to at least one output interface of the sum path, the azimuth path, and the high and low paths of the receiver to be tested to obtain an output value; Alternatively, an oscilloscope is connected to the output interfaces of the sum path, azimuth path, and high and low paths of the receiver to be tested, respectively, to obtain output values.

2. According to the pulse radar receiver debugging platform of claim 1, it is characterized in that: The platform also includes a power supply device, specifically a DC regulated power supply with a preset voltage condition, which supplies power to the pulse radar receiver debugging platform and the receiver to be tested through a signal distribution box.

3. According to claim 2, the pulse radar receiver debugging platform is characterized in that: The platform also includes a noise meter, which is connected to the input channels and output channels of the sum path, azimuth path, high and low paths of the receiver to be tested respectively.

4. The pulse radar receiver debugging platform according to claim 1, characterized in that: The three channels of the power divider have the same insertion loss, and the cables used to connect different channels to the power divider have the same insertion loss.

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