CN101393261B

CN101393261B - Protection circuit for X waveband radar receiver

Info

Publication number: CN101393261B
Application number: CN2008102320193A
Authority: CN
Inventors: 梁长明; 刘丽华
Original assignee: Xi'an Huateng Microwave Co Ltd
Current assignee: Xi'an Huateng Microwave Co Ltd
Priority date: 2008-10-30
Filing date: 2008-10-30
Publication date: 2012-01-11
Anticipated expiration: 2028-10-30
Also published as: CN101393261A

Abstract

The invention relates to a radar receiver circuit, in particular to a protection method for an X-band radar receiver. The radar receiver is characterized by comprising two high-power PIN diode switches, two magic Ts and a passive limiter, wherein the two magic Ts and two large-power PIN diodes form two right-angle electric bridges which then form two single-pole single-throw reflective switches. When a radar transmitter transmits microwave high-power pulses, a control signal renders the PIN diodes in the two right-angle electric bridges electrified and a single-pole single-throw switch formed by the magic T1 and magic T1 completely reflective; while when the radar transmitter stops transmitting signals and receives back waves, a control signal renders the PIN diodes not electrified and the single-pole single-throw switch formed by the magic T1 and magic T1 completely electrified. The radar receiver circuit has the advantages of long service life, large high-power bearing capacity and small influence on signal transmission.

Description

A kind of holding circuit of X-band radar receiver

Technical field

The present invention relates to a kind of radar receiver circuit, particularly a kind of guard method of X-band radar receiver.

Background technology

At present, so almost the protector of high powered radar receiver has all adopted gas-discharge tube, promptly TR manages; Its principle is that gas is under the High-Power Microwave electromagnetic field effect; Producing ionization becomes electric conductor, with the prevention entering receiver that transmits, thereby has protected the microwave device of receiver front end.The TR pipe can be protected receiver, but has two fatal shortcomings:

Life-span is short: because gas ionization meeting sacrificial electrode and gas, the TR tube lifetime that generally adds direct current biasing is about 500 hours, even adopt radioisotopic TR its life-span of pipe also can only reach 3000 hours.

The phase noise that transmits is degenerated: because gas ionization can produce very big noise, and the TR pipe is total-reflection type, so these noises can reflex to transmitter, and the phase noise that transmits is degenerated.This is unallowed for high performance pulse Doppler radar.

For the radar receiver protector, also adopt PIN pipe switch again, but since single PIN pipe to bear power limited, therefore this PIN pipe switch is difficult to use in the high powered radar.

Summary of the invention

The purpose of this invention is to provide a kind of life-span long, bear power big, to the guard method of the little X-band radar receiver of influence that transmits.

The objective of the invention is to realize like this; A kind of guard method of X-band radar receiver; It is characterized in that: comprise two high-power PIN pipe switch, 2 magic T and passive limiters; 2 magic T and high-power PIN pipe constitute 2 90 ° of electric bridges, form the single-pole single-throw (SPST) reflective switch through 2 90 ° of electric bridges, when radar transmitter launched microwave high power pulse; Control signal makes 2 PIN pipes in 90 ° of electric bridges be in conducting state, and the single-pole single-throw switch (SPST) that magic T1, magic T2 form is in the total reflection state; When radar transmitter stops emission signal, radar is in when receiving echo, and control signal makes 2 PIN pipes in 90 ° of electric bridges be in not on-state, and the single-pole single-throw switch (SPST) that magic T1, magic T2 form is in the all-pass state.

The be possessed end of T1 of described 2 90 ° of electric bridges 1 is connected with load Z1, and the end of magic T2 is connected with the radar signal input end.

4 ends that described 2 90 ° of electric bridges 2 are magic T1 are connected with passive limiter, and 4 ends of magic T2 are connected with load Z2; The microwave signal of input was clipped to H1 and H2 in 1 minute through electric bridge, and the single-pole single-throw switch (SPST) of forming through magic T is input to electric bridge 2 through E1 and E2, and the signal that electric bridge 2 is imported E1 and E2 synthesizes to be exported by output terminal.

The 3 end total reflections of described magic T1 and magic T2; The 2 end total reflections of evil spirit T1 and magic T2 also are connected with the negative electricity of high-power PIN pipe respectively.

Described electric bridge 1 is divided into two power input, and two magic T are divided into two power input again.

Advantage of the present invention is: utilize characteristic and the PIN pipe phase-shift theory of 90 ° of electric bridges of waveguide and magic T, formed high power switch, add the passive diode limiter and formed the radar receiver protector.Be characterized in that all solid state, long-life, MTBF reach 30,000 hours; It is big to bear power, and it is big 8～16 times to bear power than single PIN pipe; Absorption, little to the noise effect that transmits, improved the performance of pulse Doppler radar.

Description of drawings

Below in conjunction with the embodiment accompanying drawing the present invention is described further.

Fig. 1 is an embodiment of the invention structural representation.

Embodiment

As shown in Figure 1; Comprise two high-power PIN pipe switch, 2 magic T and passive limiters, constitute 2 90 ° of electric bridges, form the single-pole single-throw (SPST) reflective switch through 2 90 ° of electric bridges 1, electric bridge 2 by magic T1, magic T2 and high-power PIN pipe; Utilize the characteristic of magic T; 2 ends at magic T1 and magic T2 even are connected high-power PIN diode respectively, and the anode of high-power PIN diode is electrically connected with control signal, and the H2 arm of magic T2 is electrically connected with microwave input signal; The E1 arm of evil spirit T1 is electrically connected with passive limiter; The evil spirit T1 the H1 arm with through load Z1 ground connection; The E2 arm of evil spirit T2 is through load Z2 ground connection; Microwave signal is by the H2 arm input of magic T2; When radar transmitter launched microwave high power pulse, control signal makes two PIN pipe D1, D2 in 90 ° of electric bridges be in conducting state, and the single-pole single-throw switch (SPST) that at this moment magic T1, magic T2 form is in the total reflection state; This moment, the microwave signal by the input end input was clipped to H1 and H2 in 1 minute through electric bridge; H1 and H2 are total reflection, and energy is delivered to load 1 and is absorbed, thereby make output power very little.When radar transmitter stops emission signal, radar is in when receiving echo, and control signal makes two PIN pipe D1, D2 in 90 ° of electric bridges be in not on-state, and the single-pole single-throw switch (SPST) that magic T1, magic T2 form is in the all-pass state.This moment, the microwave signal by defeated end input was clipped to H1 and H2 in 1 minute through electric bridge, and the single-pole single-throw switch (SPST) of forming through magic T is passed to electric bridge 2 through E1 and E2, and the signal that electric bridge 2 is imported E1 and E2 synthesizes to be exported by output terminal.The be possessed end of T1 of 2 90 ° of electric bridges 1 is connected with load Z1, and the end of magic T2 is connected with the radar signal input end.

4 ends that 2 90 ° of electric bridges 2 are magic T1 are connected with passive limiter, and 4 ends of magic T2 are connected with load Z2; The microwave signal of input was clipped to H1 and H2 in 1 minute through electric bridge, and the single-pole single-throw switch (SPST) of forming through magic T is input to electric bridge 2 through E1 and E2, and the signal that electric bridge 2 is imported E1 and E2 synthesizes to be exported by output terminal.The 3 end total reflections of evil spirit T1 and magic T2; The 2 end total reflections of evil spirit T1 and magic T2 also are connected with the negative electricity of high-power PIN pipe respectively.Electric bridge 1 is divided into two power input, and two magic T are divided into two power input again.

Utilize the characteristic of magic T in the embodiment of the invention, on the arm 1 of magic T1 and magic T2, adorn PIN diode.During the conducting of PIN utmost point pipe, reflected phase will is identical with 2 arms, and the microwave power of H arm input all returns the H arm; When PIN manages not conducting, reflected phase will and 2 arms opposite (differing 180 °), the microwave power of H arm input is all exported from the E arm.Between E arm and H arm, just constituted the single-pole single-throw (SPST) reflective switch like this.When microwave signal by 1 mouthful of input, divide power equally output for 2,3 mouthfuls, 90 ° of phase differential; If 2,3 mouthfuls with the total reflection of power homophase, then reflective power all gets into 4 mouthfuls, and 1 mouthful is mated.Utilize 90 ° of electric bridge characteristics,, can form an absorption switch, add a passive limiter again, just constituted complete radar receiver protector the single-pole single-throw (SPST) reflective switches that the magic T of 2 90 ° of electric bridges and 2 constitutes.

Performance index of the present invention are as follows:

Frequency of operation 9200～9600MHz

Maximum is born pulse power >=10KW (τ=2.5 μ S.Dutycycle 0.002)

Low-power is inserted loss≤1.2dB

Active isolation >=the 30dB of high power

Input and output standing wave≤1.2 (under the free position)

Clipping lever≤15dBm

Active switch speed≤2 μ S

Mean time between failures MTBF >=30,000 hour

Claims

1. the holding circuit of an X-band radar receiver; It is characterized in that: comprise two high-power PIN pipe switch, 2 magic T and passive limiters; 2 magic T and high-power PIN pipe constitute 2 90 ° of electric bridges, form the single-pole single-throw (SPST) reflective switch through 2 90 ° of electric bridges, when radar transmitter launched microwave high power pulse; Control signal makes 2 PIN pipes in 90 ° of electric bridges be in conducting state, and the single-pole single-throw switch (SPST) that magic T1, magic T2 form is in the total reflection state; When radar transmitter stops emission signal, radar is in when receiving echo, and control signal makes 2 PIN pipes in 90 ° of electric bridges be in not on-state, and the single-pole single-throw switch (SPST) that magic T1, magic T2 form is in the all-pass state.

2. the holding circuit of a kind of X-band radar receiver according to claim 1 is characterized in that: the be possessed end of T1 of described 2 90 ° of first electric bridges is connected with load Z1, and the end of magic T2 is connected with the radar signal input end.

3. the holding circuit of a kind of X-band radar receiver according to claim 1 is characterized in that: 4 ends that described 2 90 ° of second electric bridges are magic T1 are connected with passive limiter, and 4 ends of magic T2 are connected with load Z2; The microwave signal of input was clipped to H1 and H2 in 1 minute through electric bridge, and the single-pole single-throw switch (SPST) of forming through magic T is input to second electric bridge through E1 and E2, and the signal that second electric bridge is imported E1 and E2 synthesizes to be exported by output terminal.

4. the holding circuit of a kind of X-band radar receiver according to claim 1 is characterized in that: the 3 end total reflections of described magic T1 and magic T2; The 2 end total reflections of evil spirit T1 and magic T2 also are connected with the negative electricity of high-power PIN pipe respectively.

5. the holding circuit of a kind of X-band radar receiver according to claim 2 is characterized in that: described first electric bridge is divided into two power input, and two magic T are divided into two power input again.