CN201600449U - Front end device for integrated microwave altimeter - Google Patents
Front end device for integrated microwave altimeter Download PDFInfo
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- CN201600449U CN201600449U CN2009202832454U CN200920283245U CN201600449U CN 201600449 U CN201600449 U CN 201600449U CN 2009202832454 U CN2009202832454 U CN 2009202832454U CN 200920283245 U CN200920283245 U CN 200920283245U CN 201600449 U CN201600449 U CN 201600449U
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Abstract
The utility model relates to a front end device for an integrated microwave altimeter. The front end device comprises a transmitting device, a receiving device and a frequency source device, wherein the transmitting device is used for frequency mixing for input intermediate frequency IFin signals and a local oscillator and then outputs radio frequency RFout signals to an antenna; the receiving device is used for frequency mixing for radio frequency RFin signals input by the antenna and local oscillator signals and then outputs intermediate frequency IFout signals; the frequency source device outputs the local oscillator signals to the transmitting device and the receiving device respectively. The local oscillator signals output by the frequency source device comprise a transmitting local oscillator signal and a receiving local oscillator signal, wherein the transmitting local oscillator signal is transmitted to the transmitting device, and the receiving local oscillator signal is transmitted to the receiving device. As the core assembly of the altimeter, the front end device for the integrated microwave altimeter has the characteristic of high sensitivity and fills up the technical blank of domestic systems.
Description
Technical field
The utility model belongs to electronic information field, and as a kind of height indicator microwave fore device, its integrated reception, emission, frequency control are in one.
Background technology
Radar altimeter is as a kind of main electronic equipment, it can measure the true altitude of flying body apart from ground accurately and fast under various weather conditions, utilize high-resolution pulse, detected landforms characteristic signals is transferred to control section, produce control signal with other device input data, revise the course and the height of flying body.Thereby be used widely in fields such as flight control and missile guidances and develop, as automatic landing, terrain following avoidance, the control of dropping a bomb of aircraft, there are not widespread uses such as the self-navigation of (having) people aircraft, cruise missile terrain contour matching guidance, global missile trajectory measurement, correction and airburst fuze.Microwave has characteristics such as weather adaptability is strong, sensitivity height compared to infrared or laser, is the preferred manner of altimeter setting.Prevailing in microwave technical field at present mainly is the west, and China starts late in this field, and technology still is in developing stage.As one of gordian technique of height indicator, the performance standard of microwave height indicator fore device just seems particularly important, and its technical indicator directly influences the performance of height indicator.
Summary of the invention
The problem that the utility model solves: existing microwave height indicator fore device still remains to be improved on performance index, though development along with technology, integrated, multi-function device is more and more general, but its application requirements is also more and more higher, need index reliable and stable and have a high-isolation, thereby improve sensitivity.
The technical scheme that the utility model adopted:
A kind of integrated microwave height indicator fore device comprises emitter, receiving trap and frequency source device; Output radio frequency out signal is given antenna after the medium-frequency IF in signal of described emitter handle input and the local oscillator Frequency mixing processing; Described receiving trap is exported medium-frequency IF out signal after the radio frequency in signal of antenna input and the local oscillation signal Frequency mixing processing; Described frequency source device is exported local oscillation signal respectively and is given emitter and receiving trap.The local oscillation signal of described frequency source device output comprises the emission local oscillation signal and receives local oscillation signal that the emission local oscillation signal sends emitter to, receives local oscillation signal and sends receiving trap to; Described frequency source device comprises: first and second programmable logic device (PLD), first and second frequency division phase lock circuitry and merit parallel circuit; Described merit parallel circuit is divided into two-way to same reference frequency signal, enters first and second frequency division phase lock circuitry respectively; Described first and second programmable logic device (PLD) receives external control signal, and controls the output frequency of first and second frequency division phase lock circuitry respectively according to this control signal; Described first frequency division phase lock circuitry output emission local oscillation signal, the output of the second frequency division phase lock circuitry receives local oscillation signal.
Also comprise self-checking unit; The signal of described emitter output connects antenna behind self-checking unit; Described self-checking unit comprises hilted broadsword biswitch, fixed attenuator and control circuit; The input end of described hilted broadsword biswitch connects the output terminal of emitter, and two output terminals of hilted broadsword biswitch connect the input end of antenna and fixed attenuator respectively, and the output terminal of fixed attenuator connects receiving trap; Described hilted broadsword biswitch is thrown the control output end that control end connects described control circuit, and the input end of described control circuit connects external control signal.
Described emitter, receiving trap, frequency source device and self-checking unit are located at respectively independently in the EMI structure, and the signal between each device adopts coaxial manner to connect.
Described emitter comprises up-converter circuit, preceding stage power amplifier, power control circuit, final power amplifier, modulation circuit and power circuit; Described IFin signal after the mixing amplification, is exported behind prime driving amplifier, power control circuit and final power amplifier in up-converter circuit more successively with the emission local oscillation signal; Described power circuit connects prime driving amplifier, power control circuit, final power amplifier and modulation circuit, is they power supplies; The input end of described power control circuit connects the external attenuation control signal; The input end of described modulation circuit connects outside TTL control signal, and output terminal connects the drain electrode pulse power of final power amplifier; Described power control circuit also is connected with the thermistor compensation network.
Described receiving trap comprises limiter, low noise amplifier, lower frequency changer circuit, filtering circuit and directional coupler; Described RFin signal is successively through limiter and low noise amplifier, again in lower frequency changer circuit with receive the local oscillation signal mixing, the signal after the mixing is exported through filtering circuit; Described directional coupler is arranged between limiter and the low noise amplifier, and coupling is from the RFout signal of self-checking unit.The described mirror image that down-converts to suppresses mixting circuit; Also be connected with quadrature bridge between the output terminal of described down coversion and the filtering circuit.The output terminal of described filtering circuit also connects the negative temperature compensating circuit, and this negative temperature compensating circuit is to be the circuit of core with the GaAs device, the output signal in-45～+ 70 ℃ of temperature ranges is changed compensating.
Described frequency source device comprises first and second programmable logic device (PLD), first and second frequency division phase lock circuitry and merit parallel circuit; Described merit parallel circuit is divided into two-way to same reference frequency signal, enters first and second frequency division phase lock circuitry respectively; Described first and second programmable logic device (PLD) is controlled the output frequency of first and second frequency division phase lock circuitry respectively.
The described first and second frequency division phase lock circuitries are identical, comprise phase detector, loop filter and voltage controlled oscillator VCO; The Programmable Logic Controller that the first and second frequency division phase lock circuitries are corresponding respectively receives outside coded signal and trigger pip, and Programmable Logic Controller output frequency control signal is given phase detector; Phase detector locks the Frequency point of output with described reference frequency signal reference; VCO is imported in the output of described phase detector into behind loop filter, VCO realizes the generation and the change of frequency under the control of the voltage-controlled voltage that phase detector produces, and exports required local oscillation signal.
Described first with identical with second Programmable Logic Controller, is CPLD, and it comprises clock generator, code translator, shift register and logic controller;
Described clock generator receives described reference frequency signal reference, uses frequency counter to generate code translator, shift register and the required clock signal of logic controller;
Described code translator receives outside control signal, and this control signal is a coded signal, and under logic controller control, calculates required local frequency, directly corresponding output parallel data;
Described shift register is according to the parallel data of code translator output, under logic controller control, according to the input requirement of back level phase detector, serial output data, clock, Load three road signals;
Described logic controller receives outside trigger pip and from the locking signal of frequency division phase lock circuitry, the action of code translator and shift register is controlled.
As the core component of height indicator, the high sensitivity characteristic of this integrated microwave height indicator fore device has been filled up the technological gap of national system.
Description of drawings
Fig. 1 total system block diagram
Fig. 2 detailed protocol theory diagram
Fig. 3 emitter theory diagram
Fig. 4 binary states power temperature compensation control circuit schematic diagram
Fig. 5 receiving trap theory diagram
Fig. 6 frequency source principle of device block diagram
Fig. 7 frequency source CPLD control circuit theory diagram
Fig. 8 self-checking unit theory diagram
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and embodiment.
Integrated microwave height indicator fore device comprises emitter, receiving trap, frequency source device and four parts of self-checking unit.Emitter is mainly realized the functions such as up-conversion, amplification, modulation and output power management of emission medium-frequency signal, exports to emitting antenna at last; The microwave signal that receiving trap is mainly realized antenna is received is by functions such as amplitude limit, low noise amplification, down coversion, filtering output intermediate-freuqncy signals; The frequency source device mainly produces the emission local oscillation signal of coherent and receives local oscillation signal, and externally the control of digital signal realizes frequency hopping down, and carries anti-losing lock function; Self-checking unit is used for when low-power mode, and connection transmits and receives, and whether self check assembly radio-frequency closed-circuit working is normal, comprises hilted broadsword biswitch, fixed attenuator and control circuit.
Emitter is mainly realized the functions such as up-conversion, amplification, modulation and output power management of emission medium-frequency signal, exports to emitting antenna at last.Up-convert to classical mixing, filtering, amplifying circuit, technology and technical maturity.Wherein use double balanced mixer to carry out up-conversion, the humorous clutter that produces in the dielectric filter elimination mixing, amplifier are selected GaAs heterojunction bipolar transistor microwave monolithic for use, and circuit form is simple and reliable; Prime and final power amplifier are Power GaAs FET, rationally mate in order to reach between circuit, carry out the ADS circuit simulation, make that circuit is stable, the input and output standing wave is reasonable, output power satisfies index, bandwidth internal power flatness height; The effect of two isolators be prevent high or low power switch and the echo of output relay switch generation when switching to the interference of power amplifier, prevent the power amplifier unstable operation and burn; Modulation circuit is a benchmark with outside TTL signal, and the control amplifier drain electrode pulse power is realized the modulation of output signal burst pulse, modulation period 400us, pulsewidth 0.9us.
The binary states power control circuit realizes that mainly the high or low power of output power 16W and 5W switches, and the output power of 5W output state is done high low temp compensating.Its electric principle such as Fig. 4.Power control input Transistor-Transistor Logic level produces driving voltage through driver, offers PIN pipe attenuation network, carries out signal attenuation.When being input as low level, PIN powers up end for negative pressure, presents the high resistant characteristic, and signal is unattenuated, and the emitter output state is high-power attitude signal output.When power control input high level; The PIN pipe adds positive voltage, presents the low-resistance characteristic, and signal respective attenuation, output power present miniwatt 5W output state.The difference of the electric current that flows through according to the PIN pipe simultaneously, its damping capacity difference.Utilize this principle, add the thermistor compensation network, utilize the temperature variant characteristic of thermistor numerical value that damping capacity is compensated, to satisfy-45～+ 70 ℃ of complete warm miniwatt ± 2W down with interior output power precision at driver output end.And under the high-power state, the control of output power is to choose with suitable GaAs FET working point to reach.At this moment, adjust grid voltage biasing and the drain voltage of final stage GaAs FET, make power amplifier be operated in rational working point, amplifier always works in state of saturation when temperature variation, reaches in the high-power variation ± 1W of the full temperature of output power down.
The microwave signal that receiving trap is mainly realized antenna is received is by functions such as amplitude limit, low noise amplification, down coversion, filtering output intermediate-freuqncy signals.In addition, design a directed coupling mechanism at input end, when the self check duty, coupling is from the signal of emission port.Coupling mechanism is classical directional couple line; Limiter is the PIN diode amplitude limiter circuit, prevents that undesired high-power signal from pouring into receiving trap, burns device.Low noise amplifier is selected the GaAs low-noise FET for use, carries out ADS emulation, make that circuit is stable, the input and output standing wave rationally, amplifier gain and noise meet the demands.The size of noise has determined the quality of receiving sensitivity, and the side circuit test draws, and the present invention receives low noise amplifier noise≤0.9dB; Down-convert to mirror image and suppress mixting circuit, the use quadrature bridge is guaranteed the inhibition to image frequency; Output filter is the LC bandpass filter, and the unnecessary clutter of elimination takes out intermediate-frequency bandwidth on the one hand on the one hand, improves receiving sensitivity; Negative temperature compensating circuit, the temperature variation of the used GaAs device of compensating circuit in-45～+ 70 ℃ of scopes are used in output at last.
The frequency source device mainly produces the emission local oscillation signal of coherent and receives local oscillation signal, and externally the control of digital signal realizes frequency hopping down, and carries anti-losing lock function.Use independent circuit to realize the transmitting-receiving isolation separately, two circuit are shared same with reference to crystal oscillator realization frequency coherent.Frequency produces and is realized by the frequency dividing phase-locked loop circuit.Frequency division is phase-locked to have stable, spuious little, the characteristics such as power consumption is little of lock, is made up of phase detector, loop filter, VC0.Phase detector is a digital-analog hybrid integrated circuit, under the control of CPLD, is reference with the crystal oscillator signal, with frequency lock at required frequency; Loop filter is the RC low-pass filter, is used for the elimination phase demodulation and reveals; VCO realizes the generation and the change of frequency under the control of the voltage-controlled voltage that phase detector produces.
CPLD is used for channel frequency control, frequency hopping reaction time≤22us.It controls whole phase-locked loop circuit according to logical circuit, is the key that whole assembly is realized the anti-losing lock function of frequency source.The design ultimate principle block diagram of CPLD control circuit is shown in 7.
1) clock generating part uses frequency counter to produce the required clock signal of each subsystem in design, coordinates each subsystem work;
2) the decoding part according to input coding and trigger pip, calculates required local frequency, directly corresponding output parallel data;
3) displacement output, major function is the parallel data according to code translator output, under logic control, according to the input requirement of back level phase detector, serial output data, clock, Load three road signals;
4) logic control circuit, our department is divided into the emphasis in the design, have opening initialization, losing lock again signaling, prevent to disturb functions such as burr level.Mainly comprise following logic function circuit design:
A) power-on reset signal produces design: the uncertainty of state exerts an influence to system in the logical circuit when powering on, and reset function is all arranged in the each several part functional module, when start, utilizes this circuit to produce the reset signal of certain time-delay.
B) the heavy trigger circuit design of losing lock: in order to prevent the phaselocked loop losing lock, in case the discovery locking signal is out-of-lock condition (low level), then trigger the coding transtation mission circuit again, the replacement phase-locked loop circuit reaches at short notice the purpose of locking again.
C) trigger pip Anti-interference Design: in order to prevent circuit the burr undesired signal is caused maloperation as trigger pip, in design, added Anti-interference Design, when having only trigger pip to keep the high level of certain hour, just think that this triggers effectively.
Self-checking unit is used for when low-power mode, and connection transmits and receives, and whether self check assembly radio-frequency closed-circuit working is normal, is made up of hilted broadsword biswitch, fixed attenuator and control circuit.Because this part directly links to each other receiving trap physically with emitter, therefore, the performance at this place will be one of key factor that influences receive-transmit isolation.Common electronic switch here be difficult to satisfy turn-off is isolated and anti-powerful requirement, so selects relay switch for use, and it turn-offs isolation 〉=70dB, working temperature-55～+ 85 ℃; On physical construction, adopt the shielding wall of sealing, from the interference between the shielding transmitting-receiving of space.
In order to satisfy the receive-transmit isolation requirement of superelevation, adopt following SOME METHODS.
1) EMC Design: each functional unit is adopted the sub-module design, form the metal wall of electromagnetic screen.The use coaxial manner connects, and reduces the space radiation of crosstalking; Strengthen the uncoupling of power circuit, prevent that undesired signal from passing through shared power circuit and propagating, the power interface of each several part adopts EM worker's wave filter and secondary voltage stabilizing to combine and removes the coupling radiofrequency signal.
2) select suitable circuit topology: use two to overlap independently local vibration source circuit, make device on circuit structure, maximize separation, stop receiving and transmitting signal by the mutual interference of circuit phase.
3) select suitable type of device: for receiving trap and the emitter unique position that links to each other on circuit topology, the directly quality of influence transmitting-receiving isolation is isolated in the shutoff of hilted broadsword biswitch.Select to turn-off and isolate very high relay switch, when turn-offing, make transmitting-receiving disconnect physically, comprehensively other each circuit performances finally reach greater than the transmitting-receiving of 130dB and isolate.
The actual test result of table 1 leading indicator
The present invention has the transmitting-receiving isolation＞130dB of superelevation and burst pulse power binary states temperature compensation modulation in full temperature scope as can be seen from Table 1, during high-power 16W, in the full temperature variation ± 1W; During miniwatt 5W, in the full temperature variation ± 2W.
The technique effect of this device is as follows:
1. receive and dispatch the superelevation isolation technology
This device is in order to satisfy the requirement of system's system and actual application environment, must keep performance normal under the situation that emitter and receiving trap are worked simultaneously, promptly must hold the isolation between the device transmitting-receiving.This device adopts passive physical isolation technology and active isolation of mixed signal and isolated from power designing technique, finally guarantees product in function and property retention advance, realizes transmitting-receiving isolation 〉=130dB, is higher than 96dB of the prior art far away.
2. burst pulse power binary states temperature compensation control technology
Because product requirement output pulse power reaches in full temperature scope: 16 ± 2W (power control signal low level), 5 ± 1W (power control signal high level), and the variable power factor of transmitting branch is numerous, except the temperature characterisitic of power amplifier itself, the variation of any one parts in the path all can change to output power, for realizing emissive power temperature compensation and function of carrying out binary states control under the burst pulse condition, this just requires to launch power amplifier all has highly stable output power in state of saturation and linear condition, therefore, take the binary states power control techniques big to exporting, miniwatt is selected.Consider the device temperature variability simultaneously,, finally successfully realize the full temperature scope inner assembly burst pulse modulation binary states stability of output power down by adopting modes such as temperature-compensation circuit and temperature compensation device.
3. frequency source is prevented the losing lock function
Phase-locked loop is an automatic phase control system, in real work, and the limit of power that might exceed automatic control that external disturbance is brought, thus cause the loop duty uncontrollable, thus losing lock appears.In order not influence the use of complete machine, must consider the anti-losing lock problem of phase locked source, this device adopts phaselocked loop losing lock level to check, finds after the losing lock signaling control phaselocked loop again, in the design of local vibration source, add anti-losing lock control, guarantee the stability of assembly.
Claims (10)
1. an integrated microwave height indicator fore device comprises emitter, receiving trap and frequency source device; Output radio frequency out signal is given antenna after the medium-frequency IF in signal of described emitter handle input and the local oscillator Frequency mixing processing; Described receiving trap is exported medium-frequency IF out signal after the radio frequency in signal of antenna input and the local oscillation signal Frequency mixing processing; Described frequency source device is exported local oscillation signal respectively and is given emitter and receiving trap, the local oscillation signal that it is characterized in that described frequency source device output comprises the emission local oscillation signal and receives local oscillation signal, the emission local oscillation signal sends emitter to, receives local oscillation signal and sends receiving trap to; Described frequency source device comprises: first and second programmable logic device (PLD), first and second frequency division phase lock circuitry and merit parallel circuit; Described merit parallel circuit is divided into two-way to same reference frequency signal, enters first and second frequency division phase lock circuitry respectively; Described first and second programmable logic device (PLD) receives external control signal, and controls the output frequency of first and second frequency division phase lock circuitry respectively according to this control signal; Described first frequency division phase lock circuitry output emission local oscillation signal, the output of the second frequency division phase lock circuitry receives local oscillation signal.
2. integrated microwave height indicator fore device according to claim 1 is characterized in that also comprising self-checking unit; The signal of described emitter output connects antenna behind self-checking unit; Described self-checking unit comprises hilted broadsword biswitch, fixed attenuator and control circuit; The input end of described hilted broadsword biswitch connects the output terminal of emitter, and two output terminals of hilted broadsword biswitch connect the input end of antenna and fixed attenuator respectively, and the output terminal of fixed attenuator connects receiving trap; Described hilted broadsword biswitch is thrown the control output end that control end connects described control circuit, and the input end of described control circuit connects external control signal.
3. integrated microwave height indicator fore device according to claim 2 is characterized in that described emitter, receiving trap, frequency source device and self-checking unit are located at respectively independently in the EMI structure, and the signal between each device adopts coaxial manner to connect.
4. according to claim 2 or 3 described integrated microwave height indicator fore devices, it is characterized in that described emitter comprises up-converter circuit, preceding stage power amplifier, power control circuit, final power amplifier, modulation circuit and power circuit; Described IFin signal after the mixing amplification, is exported behind prime driving amplifier, power control circuit and final power amplifier in up-converter circuit more successively with the emission local oscillation signal; Described power circuit connects prime driving amplifier, power control circuit, final power amplifier and modulation circuit, is they power supplies; The input end of described power control circuit connects the external attenuation control signal; The input end of described modulation circuit connects outside TTL control signal, and output terminal connects the drain electrode pulse power of final power amplifier; Described power control circuit also is connected with the thermistor compensation network.
5. according to claim 2 or 3 described integrated microwave height indicator fore devices, it is characterized in that described receiving trap comprises limiter, low noise amplifier, lower frequency changer circuit, filtering circuit and directional coupler; Described RFin signal is successively through limiter and low noise amplifier, again in lower frequency changer circuit with receive the local oscillation signal mixing, the signal after the mixing is exported through filtering circuit; Described directional coupler is arranged between limiter and the low noise amplifier, and coupling is from the RFout signal of self-checking unit.
6. integrated microwave height indicator fore device according to claim 5 is characterized in that the described mirror image that down-converts to suppresses mixting circuit; Also be connected with quadrature bridge between the output terminal of described down coversion and the filtering circuit.
7. integrated microwave height indicator fore device according to claim 5, the output terminal that it is characterized in that described filtering circuit also connects the negative temperature compensating circuit, this negative temperature compensating circuit is to be the circuit of core with the GaAs device, the output signal in-45～+ 70 ℃ of temperature ranges is changed compensating.
8. according to claim 2 or 3 described integrated microwave height indicator fore devices, it is characterized in that described frequency source device comprises first and second programmable logic device (PLD), first and second frequency division phase lock circuitry and merit parallel circuit; Described merit parallel circuit is divided into two-way to same reference frequency signal, enters first and second frequency division phase lock circuitry respectively; Described first and second programmable logic device (PLD) is controlled the output frequency of first and second frequency division phase lock circuitry respectively.
9. according to claim 2 or 3 described integrated microwave height indicator fore devices, it is characterized in that the described first and second frequency division phase lock circuitries are identical, comprise phase detector, loop filter and voltage controlled oscillator VCO; The Programmable Logic Controller that the first and second frequency division phase lock circuitries are corresponding respectively receives outside coded signal and trigger pip, and Programmable Logic Controller output frequency control signal is given phase detector; Phase detector locks the Frequency point of output with described reference frequency signal reference; VCO is imported in the output of described phase detector into behind loop filter, VCO realizes the generation and the change of frequency under the control of the voltage-controlled voltage that phase detector produces, and exports required local oscillation signal.
10. integrated microwave height indicator fore device according to claim 9 is characterized in that described first with identical with second Programmable Logic Controller, is CPLD, and it comprises clock generator, code translator, shift register and logic controller;
Described clock generator receives described reference frequency signal reference, uses frequency counter to generate code translator, shift register and the required clock signal of logic controller;
Described code translator receives outside control signal, and this control signal is a coded signal, and under logic controller control, calculates required local frequency, directly corresponding output parallel data;
Described shift register is according to the parallel data of code translator output, under logic controller control, according to the input requirement of back level phase detector, serial output data, clock, Load three road signals;
Described logic controller receives outside trigger pip and from the locking signal of frequency division phase lock circuitry, the action of code translator and shift register is controlled.
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| CN2009202832454U CN201600449U (en) | 2009-12-30 | 2009-12-30 | Front end device for integrated microwave altimeter |
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| CN2009202832454U CN201600449U (en) | 2009-12-30 | 2009-12-30 | Front end device for integrated microwave altimeter |
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| CN102360071A (en) * | 2011-06-23 | 2012-02-22 | 北京豪恩科技有限责任公司 | Method and apparatus for verification of linear frequency modulation continuous wave of radio digital altimeter |
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| CN106781374A (en) * | 2016-12-01 | 2017-05-31 | 广东技术师范学院 | A kind of self adaptation frequency corrects wireless remote controller |
| CN108107426A (en) * | 2018-01-31 | 2018-06-01 | 菏泽学院 | A kind of radio altimeter |
| CN109347493A (en) * | 2018-11-22 | 2019-02-15 | 北京遥感设备研究所 | A kind of answering machine simulator depth self-checking circuit |
| CN110031485A (en) * | 2019-04-30 | 2019-07-19 | 东北林业大学 | Trunk borer burrow detection device and its detection method inside a kind of trunk |
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| CN110361708A (en) * | 2019-08-21 | 2019-10-22 | 上海无线电设备研究所 | A kind of microwave transmitting and receiving component self-checking circuit and method |
| CN112558019A (en) * | 2020-12-14 | 2021-03-26 | 北京遥感设备研究所 | Pseudo code modulation-based extra-terrestrial celestial body landing measurement radar transmitting and receiving isolation system |
| CN112558019B (en) * | 2020-12-14 | 2023-08-15 | 北京遥感设备研究所 | Extraterrestrial celestial body landing measurement radar receiving and transmitting isolation system based on pseudo code modulation |
| CN114726368A (en) * | 2022-06-08 | 2022-07-08 | 成都世源频控技术股份有限公司 | Low-phase noise loop and loop presetting method using same |
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