CN204613398U - A kind of radar beacon machine - Google Patents

Abstract

The utility model discloses a kind of radar beacon machine, the reception of radar beacon machine is connected with circulator with the antenna transmitted, and circulator is connected with processor with intermediate-frequency receiver by receiver, and processor is connected with circulator by transmitter; Receiver, transmitter, intermediate-frequency receiver are all connected with power supply with processor.Disposal route is: after antenna receives the interrogating signal of characteristic frequency, through circulator, by entering receiver after pulse combined process; Produce intermediate-freuqncy signal and send into intermediate-frequency receiver; Filtering and sampling are carried out to intermediate-freuqncy signal, produces level signal, be sent to processor; Then use GPS location technology accurately to calculate the coordinate of radar position and the coordinate of Radio Beacon position, then distance superposition will be converted time delay to get on, finally again output encoder pulse to transmitter; To space radiation, receive for inquiry side.The utility model can adapt to the signal of diversity radar under complex electromagnetic environment, and reliability is high.

Description

A kind of radar beacon machine

Technical field

The utility model belongs to Radar Technology field, is specifically related to a kind of radar beacon machine.

Technical background

In modern war, electronic countermeasure gets more and more, targeted environment faced by radar and living environment there occurs huge change compared with the past, operational environment becomes increasingly complex, counter radar has been equipped with swift and violent development, and electronic interferences, antiradiation missile, Stealthy Target and low-level penetration have played the fighting efficiency of radar and battlefield existence constitutes serious threat.In current electronic countermeasure situation, vital effect is played to the optimize and improve of Radar Technology.

Frequency diversity technique is mainly used in communication system at first, by the signal of communication that multiple channel transfer that frequency of utilization is different are identical, ensure when certain subchannel breaks down or be disturbed, do not affect the transmission of signal of communication, thus improve the Stability and dependability of communication system.So-called frequency diversity is exactly that one can simultaneously or produce, launch, receive and process n (n >=2) kind different operating frequency in succession, target is carried out to the radar of Detection location.At present, frequency diversity technique has been widely applied in radar system, to improve the antijamming capability of radar.

Radar beacon has been widely used in the aspects such as air traffic control, radio navigation, missile guidance, exterior trajectory measurement, satellite survey rail.There are high sensitive receiver, moderate response power, have the features such as recognition capability, high frequency stability, high reliability, volume are little, lightweight, integrated to interrogating signal.

Under normal circumstances, when the interrogating signal of radar be sent by diversity radar time, because diversity radar is when sending signal, being successively send two pulse signals, when processing, can there is the situation of identification error in radar beacon machine.Namely there is certain inadaptability to diversity radar in radar beacon machine.

Diversity radar emission interrogating signal, receives signal by radar beacon machine, and makes information data process and transmit.The distance of diversity radar and radar beacon machine represents with R.Usually, the range resolution of radar can be expressed as:

$\mathrm{\ΔR}=\frac{1}{2}\mathrm{c\τ}=\frac{c}{2B}$

In formula, c is the light velocity, is the pulse width of signal; B is the width of signal.The minimum detectable range R of tradition pure-tone polse radar _mincan be expressed as:

$R_{\min }=\mathrm{\ΔR}=\frac{c}{2B}=\frac{\mathrm{cT}}{2}$

For the signal time width D of radar emission for 30, then:

$R_{\min }=\frac{\mathrm{cD}}{2}=9\mathrm{km}$

There is very large threat the detection blind area of 9km for a radar system.If after long pulse signal additional one trail short pulse signal, cutting down by compensating short pulse the unfavorable factor that long pulse brings, but when radar beacon machine receives length pulse signal, existing and will compensate short pulse and be mistaken for the problem in source signal source.

Summary of the invention

In order to overcome prior art Problems existing, the purpose of this utility model is to provide a kind of radar beacon machine, the signal of this radar beacon functional adaptation diversity radar under complex electromagnetic environment, the problem that the pulse signal adopting this radar beacon function solution diversity radar to send causes radar beacon chance error to be sentenced, reliability is high.

The purpose of this utility model is achieved through the following technical solutions:

A kind of radar beacon machine, it is characterized in that: this radar beacon machine comprises antenna, circulator, receiver, transmitter, intermediate-frequency receiver, processor and power supply, receive and be connected with circulator with the antenna transmitted, circulator is connected with processor with intermediate-frequency receiver by receiver, and processor is connected with circulator by transmitter; Receiver, transmitter, intermediate-frequency receiver are all connected with power supply with processor.

Radar beacon machine, to a disposal route for diversity radar signal, comprises the following steps:

1), after antenna receives the interrogating signal of characteristic frequency, interrogating signal will through circulator, by entering receiver after pulse combined process;

2) after interrogating signal amplifies by receiver, with local oscillation signal mixing in receiving front-end, produce intermediate-freuqncy signal and send into intermediate-frequency receiver;

3) intermediate-frequency receiver is by carrying out filtering and sampling to intermediate-freuqncy signal, produces level signal, is sent to processor;

4) processor pair level signal carries out processing and identifying, then GPS location technology is used accurately to calculate the coordinate of radar position and the coordinate of Radio Beacon position, to convert to time delay again distance superposition get on, finally again output encoder pulse to transmitter;

5) transmitter is modulated and high power amplification transmitting according to coded pulse, forms high-power transmitting, transfers to antenna through circulator, to space radiation, receive for inquiry side.

In the utility model, during diversity radar emission interrogating signal, be f in frequency ₁long pulse signal after an additional tail, namely frequency is f ₂short pulse signal, cut down by compensating short pulse the unfavorable factor that long pulse brings.Long pulse signal time width is D ₁, short pulse signal time width is D ₂, the sigtnal interval is D ₀, length time pulse signal width ratio is N, then:

It can thus be appreciated that the size of radar shadow depends on radar signal time width, reduce D ₂width can reduce the scope of radar shadow.

When radar beacon machine receives length pulse signal by antenna, by the internal data process of Radio Beacon, by frequency f ₁and f ₂pulse carry out Combination conversion, then by conversion after signal send into receiver.

The signal of radar beacon functional adaptation diversity radar of the present utility model under complex electromagnetic environment, the problem that the pulse signal adopting this radar beacon function solution diversity radar to send causes radar beacon chance error to be sentenced, reliability is high.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model;

Fig. 2 is signals transmission schematic diagram in the utility model;

Fig. 3 is radar emission signal schematic representation in the utility model;

Fig. 4 is radar beacon machine pulse combined flow path switch block diagram in the utility model;

Fig. 5 is pulse combined transition diagram in the utility model.

Embodiment

Below in conjunction with accompanying drawing, the utility model is further elaborated.

See Fig. 1, a kind of radar beacon machine, this radar beacon machine comprises antenna 1, circulator 2, receiver 3, transmitter 4, intermediate-frequency receiver 5, processor 6 and power supply 7.Receive and be connected with circulator with the antenna transmitted, circulator is connected with processor with intermediate-frequency receiver by receiver, and processor is connected with circulator by transmitter; Receiver, transmitter, intermediate-frequency receiver are all connected with power supply with processor.

The disposal route of above-mentioned radar beacon machine to diversity radar signal is as follows:

After antenna 1 receives the interrogating signal of characteristic frequency, interrogating signal will through circulator 2, by entering receiver 3 after pulse combined process 8; After interrogating signal amplifies by receiver, with local oscillation signal mixing in receiving front-end, produce intermediate-freuqncy signal and send into intermediate-frequency receiver 5; Intermediate-frequency receiver, by carrying out filtering and sampling to intermediate-freuqncy signal, produces level signal, is sent to processor 6; Processor pair level signal carries out processing and identifying, then uses GPS location technology accurately to calculate the coordinate of radar position and the coordinate of Radio Beacon position, then will convert distance superposition time delay to and get on, finally again output encoder pulse to transmitter 7; Transmitter is modulated and high power amplification transmitting according to coded pulse, and final formation is high-power to transmit, and transfers to antenna 1, to space radiation, receive for inquiry side through circulator 2.

Fig. 2 is signals transmission schematic diagram.Interrogating signal launched by diversity radar 9, received the signal of radar emission by Radio Beacon 10, and makes information data process and transmit.

See Fig. 3, when interrogating signal launched by diversity radar 9, be f in frequency ₁long pulse signal after an additional tail, namely frequency is f ₂short pulse signal, cut down by compensating short pulse the unfavorable factor that long pulse brings.Long pulse signal time width is D ₁, short pulse signal time width is D ₂, the sigtnal interval is D ₀, length time pulse signal width ratio is N, then:

$\frac{R_{D_1}}{R_{D_2}}\frac{D_1}{D_2}=N$

It can thus be appreciated that the size of radar shadow depends on radar signal time width, reduce D ₂width can reduce the scope of radar shadow.

When radar beacon machine receives length pulse signal by antenna, there is problem compensation short pulse being mistaken for source signal source, identify f by mistake ₂the rising edge of pulse processes as marker input Radio Beacon.The utility model takes the method for assembled pulse process to solve this problem:

See Fig. 4, diversity radar sends interrogating signal 11, and Radio Beacon receives interrogating signal, then down coversion 12 to intermediate-freuqncy signal, and now, intermediate-freuqncy signal on the one hand input DRFM13 carries out computing; On the other hand, detection, amplification, shaping 14 to be carried out to intermediate-freuqncy signal, output pulse signal, be supplied to the reference signal 15 of DRFM as process radar interrogator signal.But, when the interrogating signal of radar be sent by diversity radar time, because diversity radar is when sending signal, be that successively to send frequency be f ₁and f ₂two pulse signals, radar beacon machine is after carrying out detection amplification, shaping, and by generation two pulses, now, DRFM, when processing, the situation of identification error can occur.

The feature of pulse is sent for diversity radar, when the radar signal that radar beacon machine receives meets certain condition, namely judge two pulses of two pulses as same radar signal, then two pulses are incorporated in same pulse, and then be supplied to DRFM, as reference signal.

The transition form of signal is see Fig. 5, and long pulse signal time width is D ₁, short pulse signal time width is D ₂, two pulse intervals are D ₀.D ₁with D ₂ratio N determine the scope of radar shadow, N value is larger, and the scope of radar shadow is less, and N value therefore should be made as far as possible larger.But N can not infinitely increase, N value is comparatively suitable 10-1000, pulse interval D ₀span: D ₁d ₀>=D ₂.When signal meets above condition, radar beacon machine judges what these two pulses sent as same radar.Again by these two frequency f ₁and f ₂pulse combined be converted to new pulse:

D _t＝D ₁+D ₀+D ₂

Finally export this pulse, the receiver sending into Radio Beacon carries out next step operation.Adopt this method can solve DRFM when processing, the situation of identification error can occur.

Claims (1)

1. a radar beacon machine, it is characterized in that: this radar beacon machine comprises antenna (1), circulator (2), receiver (3), transmitter (4), intermediate-frequency receiver (5), processor (6) and power supply (7), receive and be connected with circulator (2) with the antenna transmitted (1), circulator (2) is connected with processor (6) with intermediate-frequency receiver (5) by receiver (3), and processor (6) is connected with circulator (2) by transmitter (4); Receiver (3), transmitter (4), intermediate-frequency receiver (5) are all connected with power supply (7) with processor (6).