CN104635218A - Millimeter wave radiometer semi-physical simulation system, signal generating method and linearity testing method - Google Patents

Abstract

The invention discloses a millimeter wave radiometer semi-physical simulation system, a signal generating method and a linearity testing method. The system comprises an echo-free isolation box, a target simulator, a millimeter wave radiometer, a control circuit and an upper computer. The signal generating method is used for controlling a voltage control attenuator of a target simulator by generating a certain control voltage, and the target simulator can generate a signal for use in the overall dynamic testing and static performance parameter testing of the millimeter wave radiometer. By adopting the millimeter wave radiometer semi-physical simulation system, a good testing environment is provided for the overall testing and signal simulation of a missile-borne millimeter wave alternating current radiometer, and a method is provided for the included angle measurement of a terminal-sensitive projectile millimeter wave alternating current radiometer. The millimeter wave radiometer semi-physical simulation system has the advantages of low cost, small size, convenience in use, high performance, high electromagnetic shielding performance, low external influence, and the like.

Description

Millimeter wave radiometer semi-matter simulating system and signal generating method and linearity test method

Technical field

The invention belongs to millimetric wave device technical field, particularly a kind of millimeter wave radiometer semi-matter simulating system and signal generating method and linearity test method.

Background technology

Nearly ten years, along with the maturation of domestic millimetric wave device technology, the research of millimeter wave passive detection device (millimeter wave radiometer) achieves breakthrough, and its cost reduces further, becomes the detector of sensitive angle especially Terminal munition first-selection.

Millimeter wave passive detection device mainly millimeter wave alternative radiometer in Terminal munition, needed to carry out test and calibration before equipment, its test comprises field dynamic test and the parameter testing of indoor static overall performance.Static overall performance test comprises sensitivity, integral time, dynamic range test, echo signal emulation and identifies.Dynamic test is generally carried out big gun and is penetrated test and high tower test, big gun penetrate test be containing millimeter wave detector entirely for Terminal munition to the detection test of realistic objective, cost is higher; The scanning probe process of Terminal munition to target simulated by usual high tower turntable millimeter wave radiometer being placed on specified altitude of high tower test, the general detection test that once can only do a height, and Terminal munition actual detection is the scanning probe process to target of differing heights from high to low, therefore high tower test can not simulate the detection overall process of Terminal munition well.A kind of reasonable method sets up semi-hardware type simulation test system.

At present at radar detection, navigation, infrared acquisition with fly the fields such as control and there has been many semi-hardware type simulation test systems." missile-borne MMW radiometer signal hardware-in-the-loop simulation " gives the semi-hardware type simulation test system of a millimeter wave radiometer, under being operated in far field condition, with the control signal expression formula of the antenna temperature variable quantity of the radiometer detection of a target, the equivalent relation between detection on actual range and semi-matter simulating system is solved from principle, but do not provide semi-matter simulating system with the concrete methods of realizing of the voltage control signal form of echo signal, there is no operability intuitively with in practical application, " the emulation test system development of 3mm wave band passive detection device " makes at the hardware of semi-matter simulating system controller and has done detailed discussion in Software for Design, detailed analysis discussion has also been done to echo signal simulation, and have employed electrically controlled attenuator to carry out the control of target simulator signal, solve signal control hardware between interface and connectivity problem, but concrete signal control form when voltage control signal expression formula when not providing target simulation equally and test, on electrically controlled attenuator, on control voltage signal and actual range, the equivalence of detection test signal is not contacted directly.

Summary of the invention

The object of the present invention is to provide a kind of millimeter wave radiometer semi-matter simulating system and signal generating method and linearity test method.

The technical solution realizing the object of the invention is: a kind of millimeter wave radiometer semi-matter simulating system, comprises target simulator, without echo shielded box, millimeter wave radiometer, control circuit and host computer;

Described is rectangular structure without echo shielded box, and the middle, two faces that its length direction is relative has the first opening and the second opening; Described target simulator is arranged in the first opening, and target simulator periphery and the first opening seal; Described second opening part is provided with three frame angle adjustment racks, and three frame angle adjustment rack peripheries and the second opening seal; Described millimeter wave radiometer is closely arranged in three frame angle adjustment racks, and described three frame angle adjustment racks are for adjusting the angle of pitch and the position angle of millimeter wave radiometer; Absorbing material is paved with without inside echo shielded box;

Described target simulator comprises noise source, voltage controlled attenuator and the emitting antenna of connecting successively, and described control circuit comprises microcontroller, digital analog converter and analog-digital converter;

Described computing machine is connected with microcontroller, the digital output port of microcontroller is connected with the digital input port of digital analog converter, the digital-to-analog conversion output port of digital analog converter is connected with the control voltage port of voltage controlled attenuator, voltage controlled attenuator control noises source generates electromagnetic waves, gone out by transmission antennas transmit, tested millimeter wave radiometer is connected with the analog input end of analog-digital converter, the digital output port of analog-digital converter is connected with microcontroller digital input port, microcontroller is connected with computing machine, voltage signal is sent to computing machine.

The signal of millimeter wave radiometer semi-matter simulating system produces a control method, comprises the following steps:

Step 1, host computer emulation detection of millimeter wave radiometer object procedure obtains one group of antenna temperature data T over time _a(t);

Step 2, by the mapping relations κ between the control voltage of the voltage controlled attenuator in microwave vector network analyzer test target simulator and damping capacity;

If step 3 target simulator emitting antenna and the receiving antenna by pyranometer meet far field condition and the R>2 (D+d) of dual-antenna system ²/ λ, the control voltage V (t) controlling attenuator is

V(t)＝κ ^-1[T _A(t)(4πR) ²/((ENR+1)·T ₀L _TSG _tG _rλ ²)]

If target simulator and met Near Field by the distance between pyranometer, and when being not less than the far field condition distance of 0.14 times of dual-antenna system, i.e. 0.28 (D+d) ²/ λ <R<2 (D+d) ²/ λ, the control voltage V (t) controlling attenuator is

$V\left(t\right)={\mathrm{\&kappa;}}^{-1}\left(\frac{T_A\left(t\right){\left(4\mathrm{\&pi;R}\right)}^2{\left(k\frac{{(D+d)}^2}{8R}\right)}^2}{(\mathrm{ENR}+1)\&CenterDot;T_0{L}_{\mathrm{TS}}{G}_t{G}_r{\mathrm{\&lambda;}}^2({\sin }^2\left(k\frac{{(D+d)}^2}{8R}\right)+4{\sin }^4\left(k\frac{{(D+d)}^2}{16R}\right))}\right)$

Wherein, T ₀for the environment temperature represented with unit Kelvin, ENR is the excess noise ratio of noise source; κ is the mapping relations of control voltage and damping capacity; L _tSfor the system loss of target simulator; T _afor host computer emulates the antenna temperature obtained; R is the distance between two antennas; G _tfor emitting antenna far gain; G _rfor receiving antenna far gain; λ is the electromagnetic wavelength of system works; D and d is the bore of target simulator antenna and tested antenna for radiometer respectively; K is wave number;

Control voltage V (t) is sent to microcontroller by step 4, host computer, the control voltage data received are sent to digital analog converter by microcontroller, digital analog converter exports analog voltage, control the damping capacity of voltage controlled attenuator, the millimeter wave noise temperature signal that voltage controlled attenuator control noises source produces;

Step 5, millimeter wave noise temperature signal are gone out by transmission antennas transmit, simulation field target emanation signal;

Step 6, tested millimeter wave radiometer receive millimeter wave noise temperature signal, and the voltage signal that tested millimeter wave radiometer exports sends to host computer through analog-digital converter, microcontroller, and host computer shows the waveform voltage signal received.

A linearity test method for millimeter wave radiometer semi-matter simulating system, comprises the following steps:

The first step, host computer send control voltage data, and described control voltage data are N number of pulse waveform; The low level of pulse waveform is zero, and high level meets V (n)=κ ^-1(κ (0)-nd), n=1,2 ..., N, N are the integer between 10 ~ 30; Square wave pulsewidth 5ms ~ 10ms, the cycle is not less than 20ms, and as n=N, the output of millimeter wave radiometer should be in state of saturation;

Wherein, κ is the mapping relations between the control voltage of voltage controlled attenuator in target simulator and damping capacity; D is the bore of tested antenna for radiometer;

Second step, control voltage data are after the system emulation of millimeter wave radiometer half object test, and host computer receives voltage data;

The maximum point of N number of pulse of the voltage data that the 3rd step, taking-up receive, removes saturation voltage point and obtains one group of contact potential series;

4th step, obtain the linearity of contact potential series according to correlation method.

Compared with prior art, its remarkable advantage is in the present invention: (1) millimeter wave radiometer semi-matter simulating system of the present invention adopt good without echo shielded box capability of electromagnetic shielding, by ectocine, emulate and measuring accuracy high; (2) millimeter wave radiometer semi-matter simulating system of the present invention is that the system test of missile-borne millimeter wave alternative radiometer and signal simulation provide good test environment, also provide method for the measurement of Terminal munition millimeter wave alternative radiometer angle, have that cost is low, volume is little, easy to use, high-performance, capability of electromagnetic shielding are good, by advantages such as ectocine are little; (3) signal of the present invention produces control method simple possible, be easy to realize, voltage control signal expression formula can reflect the relation between tested millimeter wave radiometer parameter, semi-matter simulating system (containing target simulator) parameter and actual detection distance quantitatively, definitely; (4) the signal generation control method of millimeter wave radiometer semi-matter simulating system of the present invention can carry out the detection event simulation under various external field environment and encounter conditions to the millimeter wave radiometer of different bore, also can test the static parameter of millimeter wave radiometer, and accuracy is high; (5) linearity test method implementation of the present invention is simple, easy, and precision is high.

Accompanying drawing explanation

Fig. 1 is millimeter wave radiometer semi-matter simulating system structural representation of the present invention.

Fig. 2 is three frame angle adjustment rack structural representations of the present invention.

Fig. 3 is the cut-open view of absorbing material installation site of the present invention.

Embodiment

Composition graphs 1, a kind of millimeter wave radiometer hardware-in-the-loop simulation and test macro, comprise target simulator, without echo shielded box 1, millimeter wave radiometer, control circuit and host computer;

Described is rectangular structure without echo shielded box 1, and the middle, two faces that its length direction is relative has the first opening and the second opening; Described target simulator is arranged in the first opening, and target simulator periphery and the first opening seal; Described second opening part is provided with three frame angle adjustment rack 2, three frame angle adjustment rack 2 peripheries and the second opening seals; Described millimeter wave radiometer is closely arranged in three frame angle adjustment racks 2, and described three frame angle adjustment racks are for adjusting the angle of pitch and the position angle of millimeter wave radiometer; The emitting antenna 3 of described target simulator points to the antenna 4 of millimeter wave radiometer; Absorbing material 5 is paved with without inside echo shielded box 1;

Described target simulator comprises noise source, voltage controlled attenuator and the emitting antenna of connecting successively, and described control circuit comprises microcontroller, digital analog converter and analog-digital converter;

Described computing machine is connected with microcontroller, the digital output port of microcontroller is connected with the digital input port of digital analog converter, the digital-to-analog conversion output port of digital analog converter is connected with the control voltage port of voltage controlled attenuator, tested millimeter wave radiometer is connected with the analog input end of analog-digital converter, the digital output port of analog-digital converter is connected with microcontroller digital input port, microcontroller is connected with computing machine, and the voltage signal received is sent to computing machine.

Composition graphs 2, described three frame angle adjustment racks comprise outside framework 21, central frame 22 and inner frame 23; Be round mouth 10 in the middle of inner frame, described round mouth 10 is for installing millimeter wave radiometer, and round mouth size is identical with the caliber size of millimeter wave radiometer; Arrange pitching rotating shaft between described outside framework 21 and central frame 22, central frame 22 and inner frame 23 arrange direction rotating shaft, or arrange direction rotating shaft between described outside framework and central frame, and central frame and inner frame arrange pitching rotating shaft; The angle of pitch and the position angle of millimeter wave radiometer is changed by the rotation of pitching rotating shaft and direction rotating shaft.

The described three frame angle adjustment rack angles of pitch and position angle adjustment place are provided with turbine and worm and vernier caliper, for setting the angle of pitch and the position angle of millimeter wave alternative radiometer in circular hole.

Composition graphs 3, the described inner side without echo shielded box is paved with wedge shape absorbing material 51, and corner adopts Electromagnetic Wave Absorbing Plate transition 52.

Described microcontroller adopts the STM32 chip of ARMCORTEX-M3 kernel, and microcontroller is also connected with touch-screen, for man-machine interaction.

The signal of millimeter wave radiometer half object test system produces a control method, comprises the following steps:

Step 1, host computer emulation detection of millimeter wave radiometer object procedure obtains one group of antenna temperature data T over time _a(t);

Step 2, by the mapping relations κ between the control voltage of the voltage controlled attenuator in microwave vector network analyzer test target simulator and damping capacity;

If step 3 target simulator emitting antenna and the receiving antenna by pyranometer meet far field condition and the R>2 (D+d) of dual-antenna system ²/ λ, the control voltage V (t) controlling attenuator is

V(t)＝κ ^-1[T _A(t)(4πR) ²/((ENR+1)·T ₀L _TSG _tG _rλ ²)]

If target simulator and met Near Field by the distance between pyranometer, and when being not less than the far field condition distance of 0.14 times of dual-antenna system, i.e. 0.28 (D+d) ²/ λ <R<2 (D+d) ²/ λ, the control voltage V (t) controlling attenuator is

$V\left(t\right)={\mathrm{\&kappa;}}^{-1}\left(\frac{T_A\left(t\right){\left(4\mathrm{\&pi;R}\right)}^2{\left(k\frac{{(D+d)}^2}{8R}\right)}^2}{(\mathrm{ENR}+1)\&CenterDot;T_0{L}_{\mathrm{TS}}{G}_t{G}_r{\mathrm{\&lambda;}}^2({\sin }^2\left(k\frac{{(D+d)}^2}{8R}\right)+4{\sin }^4\left(k\frac{{(D+d)}^2}{16R}\right))}\right)$

Wherein, T ₀for the environment temperature represented with unit Kelvin, ENR is the excess noise ratio of noise source; κ is the mapping relations of control voltage and damping capacity; L _tSfor the system loss of target simulator; T _afor host computer emulates the antenna temperature obtained; R is the distance between two antennas; G _tfor emitting antenna far gain; G _rfor receiving antenna far gain; λ is the electromagnetic wavelength of system works; D and d is the bore of target simulator antenna and tested antenna for radiometer respectively; K is wave number;

Control voltage V (t) is sent to microcontroller by step 4, host computer, the control voltage data received are sent to digital analog converter by microcontroller, digital analog converter exports analog voltage, control the damping capacity of voltage controlled attenuator, the millimeter wave noise temperature signal that voltage controlled attenuator control noises source produces;

Step 5, millimeter wave noise temperature signal are gone out by transmission antennas transmit, simulation field target emanation signal;

Step 6, tested millimeter wave radiometer receive millimeter wave noise temperature signal, and the voltage signal that tested millimeter wave radiometer exports sends to host computer through analog-digital converter, microcontroller, and host computer shows the waveform voltage signal received.

A kind of millimeter wave radiometer half object test system linearity degree method of testing, comprises the following steps:

The first step, host computer send control voltage data, and described control voltage data are N number of pulse waveform; The low level of pulse waveform is zero, and high level meets V (n)=κ ^-1(κ (0)-nd), n=1,2 ..., N, N are the integer between 10 ~ 30; Square wave pulsewidth 5ms ~ 10ms, the cycle is not less than 20ms, and as n=N, the output of millimeter wave radiometer should be in state of saturation;

Wherein, κ is the mapping relations between the control voltage of voltage controlled attenuator in target simulator and damping capacity; D is the bore of tested antenna for radiometer;

Second step, control voltage data are after the system emulation of millimeter wave radiometer half object test, and host computer receives voltage data;

The maximum point of N number of pulse of the voltage data that the 3rd step, taking-up receive, removes saturation voltage point and obtains one group of contact potential series;

4th step, obtain the linearity of contact potential series according to correlation method.

Below in conjunction with specific embodiment, the present invention is described in further detail.

Embodiment 1

Composition graphs 1, millimeter wave radiometer semi-matter simulating system comprises target simulator, without echo shielded box 1, millimeter wave radiometer, control circuit and host computer; Target simulator comprises noise source, voltage controlled attenuator and the emitting antenna of connecting successively, and millimeter wave noise source, voltage controlled attenuator, emitting antenna 3 all adopt millimeter wave standard waveguide mouth to connect; Described control circuit comprises microcontroller, digital analog converter and analog-digital converter;

The first opening and the second opening is had without two faces relative in echo shielded box 1, align in Liang Gekou center, target simulator is placed in the first opening without echo shielded box 1, emitting antenna 3 actinal surface of target simulator points to without inside echo shielded box 1 simultaneously, at the second opening without echo shielded box 1, three frame angle adjustment racks 2 are housed, tested millimeter wave radiometer is placed in three frame angle adjustment racks 2, and tested antenna for radiometer 4 also points to without inside echo shielded box 1; Without echo shielded box except the remainder of two mouths is paved with absorbing material 5, absorbing material 5 requires to reach more than-30dB to millimeter-wave signal decay;

Be 1.4m × 0.7m × 0.7m without echo shielded box volume, housing is the rectangular parallelepiped that HLS1 type individual layer steel plate is formed, and steel plate thickness is not less than 2mm, and the welding between steel plate housing each adopts volume welding technology, to strengthen shielding properties.

Three frame angle adjustment racks 2 comprise outside framework 21, central frame 22 and inner frame 23; Be round mouth 10 in the middle of inner frame, described round mouth 10 is for installing millimeter wave radiometer, and round mouth size is identical with the caliber size of millimeter wave radiometer; Two direction rotating shafts (26 are provided with between described outside framework 21 and central frame 22,27), central frame 22 and inner frame 23 are provided with two pitching rotating shafts (24,25) angle of pitch and the position angle of millimeter wave radiometer, is changed by the rotation of pitching rotating shaft and direction rotating shaft.

Computing machine is connected with microcontroller by Serial Port Line, the digital output port of microcontroller is connected with the digital input port of digital analog converter, the digital-to-analog conversion output port of digital analog converter is connected with the control voltage port of voltage controlled attenuator, tested millimeter wave radiometer is connected with the analog input end of analog-digital converter, the digital output port of analog-digital converter is connected with microcontroller digital input port, microcontroller is connected with computing machine, and the voltage signal received is sent to computing machine; Wherein DAC chip adopts sub-miniature A connector to be connected with shielding line with the control port of voltage controlled attenuator, and DAC chip bit wide should be not less than 12; ADC chip bit wide should be not less than 10.

Microcontroller adopts the STM32 chip of ARM CORTEX-M3 kernel; Tested millimeter-wave radiation counts millimeter wave alternative radiometer, and bore controls at below 220mm.

Without in echo shielded box, distance between tested millimeter wave radiometer receiving antenna 4 and target simulator emitting antenna 3 meets far field condition, also can only meet target simulator emitting antenna 3 and by the Near Field of receiving antenna 4 dual-antenna system of pyranometer, but the far field condition of 0.14 times of dual-antenna system should be not less than.

Noise source in target simulator should cover the millimeter wave frequency band of hardware-in-the-loop simulation, and excess noise ratio is not less than 20dB; The dynamic range of voltage controlled attenuator decay is not less than 20dB, and Insertion Loss is less than-3dB, and Attenuation adjustable rate of change is not higher than 10dB/V; Emitting antenna 3 bandwidth should cover tested millimeter wave radiometer bandwidth range, and the main beam of emitting antenna 3 can not be irradiated to sidewall.

The signal of millimeter wave radiometer semi-matter simulating system of the present invention produces control method and can simulate the detection event that the millimeter wave radiometer of different bore carry out under various external field environment and encounter conditions, also can test the static parameter of millimeter wave radiometer, and accuracy is high.

Claims (7)

1. a millimeter wave radiometer semi-matter simulating system, is characterized in that, comprises target simulator, without echo shielded box, millimeter wave radiometer, control circuit and host computer;

Described is rectangular structure without echo shielded box, and the middle, two faces that its length direction is relative has the first opening and the second opening; Described target simulator is arranged in the first opening, and target simulator periphery and the first opening seal; Described second opening part is provided with three frame angle adjustment racks, and three frame angle adjustment rack peripheries and the second opening seal; Described millimeter wave radiometer is closely arranged in three frame angle adjustment racks, and described three frame angle adjustment racks are for adjusting the angle of pitch and the position angle of millimeter wave radiometer; Absorbing material is paved with without inside echo shielded box;

Described target simulator comprises noise source, voltage controlled attenuator and the emitting antenna of connecting successively, and described control circuit comprises microcontroller, digital analog converter and analog-digital converter;

Described computing machine is connected with microcontroller, the digital output port of microcontroller is connected with the digital input port of digital analog converter, the digital-to-analog conversion output port of digital analog converter is connected with the control voltage port of voltage controlled attenuator, voltage controlled attenuator control noises source generates electromagnetic waves, gone out by transmission antennas transmit, tested millimeter wave radiometer is connected with the analog input end of analog-digital converter, the digital output port of analog-digital converter is connected with microcontroller digital input port, microcontroller is connected with computing machine, voltage signal is sent to computing machine.

2. millimeter wave radiometer semi-matter simulating system according to claim 1, is characterized in that, described three frame angle adjustment racks comprise outside framework, central frame and inner frame; Be round mouth in the middle of inner frame, described round mouth is for installing millimeter wave radiometer, and round mouth size is identical with the caliber size of millimeter wave radiometer; Arrange pitching rotating shaft between described outside framework and central frame, central frame and inner frame arrange direction rotating shaft, or arrange direction rotating shaft between described outside framework and central frame, and central frame and inner frame arrange pitching rotating shaft; The angle of pitch and the position angle of millimeter wave radiometer is changed by the rotation of pitching rotating shaft and direction rotating shaft.

3. millimeter wave radiometer semi-matter simulating system according to claim 2, it is characterized in that, the described three frame angle adjustment rack angles of pitch and position angle adjustment place are provided with turbine and worm and vernier caliper, for setting the angle of pitch and the position angle of millimeter wave alternative radiometer in circular hole.

4. the millimeter wave radiometer semi-matter simulating system according to Claims 2 or 3, is characterized in that, the described inner side without echo shielded box is paved with wedge shape absorbing material, and corner adopts Electromagnetic Wave Absorbing Plate transition.

5. millimeter wave radiometer semi-matter simulating system according to claim 1, is characterized in that, described microcontroller adopts the STM32 chip of ARM CORTEX-M3 kernel, and microcontroller is also connected with touch-screen, for man-machine interaction.

6. the signal based on millimeter wave radiometer semi-matter simulating system according to claim 1 produces a control method, it is characterized in that, comprises the following steps:

Step 1, host computer emulation detection of millimeter wave radiometer object procedure obtains one group of antenna temperature data T over time _a(t);

Step 2, by the mapping relations κ between the control voltage of the voltage controlled attenuator in microwave vector network analyzer test target simulator and damping capacity;

If step 3 target simulator emitting antenna and the receiving antenna by pyranometer meet far field condition and the R>2 (D+d) of dual-antenna system ²/ λ, the control voltage V (t) controlling attenuator is

V(t)＝κ ^-1[T _A(t)(4πR) ²/((ENR+1)·T ₀L _TSG _tG _rλ ²)]

If target simulator and met Near Field by the distance between pyranometer, and when being not less than the far field condition distance of 0.14 times of dual-antenna system, i.e. 0.28 (D+d) ²/ λ <R<2 (D+d) ²/ λ, the control voltage V (t) controlling attenuator is

$V\left(t\right)={\mathrm{\&kappa;}}^{-1}\left(\frac{T_A\left(t\right){\left(4\mathrm{\&pi;R}\right)}^2{\left(k\frac{{(D+d)}^2}{R}\right)}^2}{(\mathrm{ENR}+1)\&CenterDot;T_0{L}_{\mathrm{TS}}{G}_t{G}_t{\mathrm{\&lambda;}}^2({\sin }^2\left(k\frac{{(D+d)}^2}{8R}\right)+4{\sin }^4\left(k\frac{{(D+d)}^2}{16R}\right))}\right)$

Wherein, T ₀for the environment temperature represented with unit Kelvin, ENR is the excess noise ratio of noise source; κ is the mapping relations of control voltage and damping capacity; L _tSfor the system loss of target simulator; T _afor host computer emulates the antenna temperature obtained; R is the distance between two antennas; G _tfor emitting antenna far gain; G _rfor receiving antenna far gain; λ is the electromagnetic wavelength of system works; D and d is the bore of target simulator antenna and tested antenna for radiometer respectively; K is wave number;

Control voltage V (t) is sent to microcontroller by step 4, host computer, the control voltage data received are sent to digital analog converter by microcontroller, digital analog converter exports analog voltage, control the damping capacity of voltage controlled attenuator, the millimeter wave noise temperature signal that voltage controlled attenuator control noises source produces;

Step 5, millimeter wave noise temperature signal are gone out by transmission antennas transmit, simulation field target emanation signal;

Step 6, tested millimeter wave radiometer receive millimeter wave noise temperature signal, and the voltage signal that tested millimeter wave radiometer exports sends to host computer through analog-digital converter, microcontroller, and host computer shows the waveform voltage signal received.

7., based on a linearity test method for millimeter wave radiometer semi-matter simulating system according to claim 1, it is characterized in that, comprise the following steps:

The first step, host computer send control voltage data, and described control voltage data are N number of pulse waveform; The low level of pulse waveform is zero, and high level meets V (n)=κ ^-1(κ (0)-nd), n=1,2 ..., N, N are the integer between 10 ~ 30; Square wave pulsewidth 5ms ~ 10ms, the cycle is not less than 20ms, and as n=N, the output of millimeter wave radiometer should be in state of saturation;

Wherein, κ is the mapping relations between the control voltage of voltage controlled attenuator in target simulator and damping capacity; D is the bore of tested antenna for radiometer;

Second step, control voltage data are after the system emulation of millimeter wave radiometer half object test, and host computer receives voltage data;

The maximum point of N number of pulse of the voltage data that the 3rd step, taking-up receive, removes saturation voltage point and obtains one group of contact potential series;

4th step, obtain the linearity of contact potential series according to correlation method.