JP2000227472A - Radar device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration in output due to temperature fluctuation so as to dispense with unnecessarily excessive power transmission by connecting (n) pieces of phase shifters between (n) pieces of distributors and (n) pieces of amplifiers of a transmitter (n is an integer 2 or more) for controlling transmission power. SOLUTION: A radar device mounted on a flying machine and the like is provided with phase shifters 10, a transmission power control command unit 14, and a transmission power monitor unit 13, for example. According to a transmission power command signal from the transmission power control command unit 14, (n) pieces of phase shifters 10 change (n) pieces of pulse wave phases divided by a (n) distributor 9 individually. An output from a (n) composer 12 is inputted to the transmission power monitor unit 13, and on the basis of the outputted transmission power monitor signal, the transmission power control command unit 14 outputs a transmission power control signal equivalent to a phase control variable for each of the (n) pieces of phase shifters 10 to each of the (n) pieces of phase shifters 10 for always keeping transmission power constant, for example. Alternatively transmission power is changed in compliance with a change of duty of the transmission signal, a relative distance to a target, an atmospheric pressure and meteorological condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radar device mounted on a flying object such as an aircraft or a missile.

[0002]

2. Description of the Related Art In a radar apparatus, the direction, distance, etc. of a target object are detected using reflected waves of a radio wave to be transmitted from the target object. The maximum value of the transmission power is defined based on the assumed worst conditions such as the reflectance, the distance between the radar device and the target, and the surrounding weather environment. However, in actual operation, the above-described various conditions are various, and the required transmission power at each time is often smaller than the maximum value.

On the other hand, it is important for many radar devices used for military purposes to ensure confidentiality, that is, to make it difficult for an opponent to find out their presence. The radiated light can be used as a clue for opponents to find their location, leading to deterioration of confidentiality. As described above, the transmission power value in the radar device is desirably determined based on the conditions when the radar device is actually used, as described above, in consideration of compatibility between target detection performance and confidentiality. The control technology aiming at variable power is important.

FIG. 8 shows an example of a conventional radar device. 8, 1 is an antenna, 2 is a circulator, 3 is a receiver, 4 is a relative distance calculator, 5
Is a modulation code generator, 6 is an oscillator, 7 is a pulse modulator, and 8 is a transmitter.

[0005] The conventional radar device is configured as described above, and the oscillator 6 generates a stable continuous wave, and the modulation code generator 5 generates a pulse modulation code and outputs it to the pulse modulator 7. The pulse modulator 7 modulates the continuous wave generated by the oscillator 6 according to the pulse modulation code generated by the modulation code generator 5 and outputs the modulated wave to the transmitter 8. The transmitter 8 amplifies the input pulse wave and outputs the amplified pulse wave to the circulator 2.
The circulator 2 receives a transmission signal and outputs the signal to the antenna 1. The antenna 1 radiates the input transmission signal to space. The transmission signal radiated into the space is irradiated on the target, and a part of the reflected wave is collected by the antenna 1 and output to the circulator 2. The circulator 2 outputs the input received signal to the receiver 3. The receiver 3 performs band limiting, amplification, down-conversion, and the like on the input received signal and outputs the signal to the relative distance calculation unit 4 as a video signal. The relative distance calculation unit 4 detects a target based on the input video signal,
Perform tracking and calculate the relative distance to the target.

[0006]

In the conventional radar apparatus as described above, the output power of the transmitter decreases with the fluctuation of the ambient temperature and the heat generation with the elapse of the operation time. In order to secure the power, it is necessary to increase the initial transmission power in order to allow for these reductions, and to transmit the high-frequency components, and there is a problem that the high-frequency components are likely to be discharged or broken.

Further, since the peak value of the transmission power is constant even if the relative distance from the target and the duty at the time of transmission change, there is a problem in terms of confidentiality.

Further, there is a problem that high-frequency components are likely to be discharged and destroyed in a low pressure region such as a high altitude.

[0009] In addition, there is a problem that the target is lost or the measurement accuracy is degraded when externally disturbed.

[0010]

In the radar apparatus according to the first aspect of the present invention, a transmission power monitor is connected between a transmitter and an antenna, and n (n is an integer of 2 or more) of the transmitter is used.
N phase shifters were connected between the distributor and n amplifiers, and a transmission power control command section was connected between the transmission power monitoring section and the transmitter.

Further, in the radar device according to the second invention, n phase shifters are connected between the n distributors and the n amplifiers of the transmitter, and the transmission is performed between the modulation code generator and the transmitter. The power control command unit was connected to the system.

Also, in the radar apparatus according to the third invention, n phase shifters are connected between the n distributors and the n amplifiers of the transmitter, and the transmission is performed between the relative distance calculator and the transmitter. The power control command unit was connected to the system.

A radar apparatus according to a fourth aspect of the present invention has n phase shifters connected between an n distributor and n amplifiers of a transmitter, and has a barometric pressure sensor mounted thereon. And a transmission power control command unit is connected between them.

Further, in the radar apparatus according to the fifth invention, n phase shifters are connected between the n distributors and the n amplifiers of the transmitter, and the transmission power is transmitted between the command transmitting unit and the transmitter. The control command unit was connected.

In the radar apparatus according to a sixth aspect of the present invention, n phase shifters are connected between the n distributors and n amplifiers of the transmitter, and the signal-to-noise ratio calculator is connected to the receiver. Then, a transmission power control command unit is connected between the signal-to-noise ratio calculation unit and the transmitter.

In the radar apparatus according to a seventh aspect of the present invention, n phase shifters are connected between the n distributors and the n amplifiers of the transmitter, and the receiver has a signal-to-interference ratio calculator. The transmission power control command unit was connected between the signal-to-interference ratio calculation unit and the transmitter.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram showing Embodiment 1 of the present invention, in which 1 is an antenna, 2 is a circulator, 3 is a receiver, 4 is a relative distance calculator, 5 is a modulation code generator, 6 is an oscillator,
7 is a pulse modulator, 8 is a transmitter, 9 is an n divider, 10 is a phase shifter, 11 is an amplifier, 12 is an n combiner, 13 is a transmission power monitoring unit, and 14 is a transmission power control command unit.

In the radar device configured as described above, the oscillator 6 generates a stable continuous wave, and the modulation code generator 5 generates a pulse modulation code and outputs it to the pulse modulator 7. The pulse modulator 7 modulates the continuous wave generated by the oscillator 6 according to the pulse modulation code generated by the modulation code generator 5 and outputs the modulated wave to the transmitter 8. In the transmitter 8, an n (n is an integer of 2 or more) distributor 9 receives a pulse wave output from the pulse modulator 7, distributes the pulse wave to n, and outputs the resulting signal to n phase shifters 10. The n phase shifters 10 receive the transmission power control command signal from the transmission power control command unit 14 and individually change the phases of the pulse waves input from the n distributor 9 according to the transmission power control command signal, and To the amplifier 11. The n amplifiers 11 amplify the input pulse wave,
Output to the n synthesizer 12. The n combiner 12 combines the input pulse waves with n, and outputs the combined pulse wave to the transmission power monitor 13. The transmission power monitoring unit 13 outputs the input transmission signal to the circulator 2 and outputs a part of the power of the transmission signal to the transmission power control command unit 14 as a transmission power monitoring signal. The transmission power control command unit 14 generates a transmission power control command signal corresponding to the individual phase control amounts of the n phase shifters 10 based on the input transmission power monitor signal so that the transmission power is always constant. Output to the phase shifters 10.

Here, the transmission power control command unit 14 calculates a power control amount using Equation 1 in order to control the transmission power to be constant. Here, the power of the transmission power monitor signal is PO, the target value of the transmission power for constant control is PC, the coefficient is k, and the power control amount is ΔATT.

[0020]

(Equation 1)

The transmission power control command section 14 has a table of power control amount versus phase control amount, and uses a phase control amount corresponding to the power control amount calculated by Equation 1 as a transmission power control command signal. Output to n phase shifters 10.

Here, the principle of controlling the transmission output using the phase shifter 10 will be described. For example, when there are two phase shifters 10 and two amplifiers 11, the combined output amplitude value when the phase control amounts θ1 and θ2 are given to each of the phase shifters 10 is obtained by Expression 2. Here, the output amplitude value of each amplifier 11 is A, the time is t, the phase difference of each phase shifter 10 is φ, and the combined output amplitude value is ΣA.

[0023]

(Equation 2)

For example, A = 1, t = 0, θ1 = 0
、 A becomes 2 when ° and θ2 = 0 °, that is, when there is no phase difference given to each phase shifter 10. Also, θ2 = 90 °
ΣA is 1.41, and each phase shifter 1
Compared with the case where there is no phase difference given to 0, the power ratio after the combination is reduced by 50%. Thus, the transmission power can be controlled to a desired value by using the phase shifter 10.

The transmission signal thus controlled to a desired value is output to the antenna 1 through the circulator 2. The antenna 1 radiates the input transmission signal to space. The transmission signal radiated into the space is irradiated on the target, and a part of the reflected wave is collected by the antenna 1 and output to the circulator 2. The circulator 2 outputs the input received signal to the receiver 3. The receiver 3 performs band limiting, amplification, down-conversion, and the like on the input received signal and outputs the signal to the relative distance calculation unit 4 as a video signal. The relative distance calculation unit 4 detects and tracks a target based on the input video signal and calculates a relative distance to the target.

As described above, the transmission power monitoring unit 13 and the transmission power control command unit 1 make the output power of the transmitter 8 constant.
By configuring and controlling the closed loop by the phase shifter 4 and the phase shifter 10, it is possible to prevent a decrease in the transmission output due to a change in temperature and a lapse of time.

Embodiment 2 FIG. FIG. 2 is a block diagram showing Embodiment 2 of the present invention.
4 is the same as the first embodiment.

In the radar device configured as described above, the transmission power control command unit 14 receives the pulse modulation code generated by the modulation code generation unit 5 and changes the average power with respect to the change in the duty of the transmission signal. The transmission power control signals corresponding to the individual phase control amounts of the n phase shifters 10 are output to the n phase shifters 10 so as to be constant. Here, the transmission power control command unit 14 calculates the power control amount using Equation 3 in order to control the average power to be constant. Here, the duty of the transmission signal uniquely determined by the pulse modulation code generated by the modulation code generator 5 is D, and the peak power of the transmission signal is P
P, the target value of the average transmission power to be controlled to be constant, PAC,
The power control amount is assumed to be ΔATT.

[0029]

(Equation 3)

Further, the transmission power control command section 14 has a table of power control amount versus phase control amount, and uses a phase control amount corresponding to the power control amount calculated by equation 3 as a transmission power control command signal. Output to n phase shifters 10.

The n phase shifters 10 correspond to the transmission power control command unit 1
4, a transmission power control command signal is input, and according to the transmission power control command signal, the phase of the input pulse wave is changed.
Output to the amplifiers 11.

The radar detection performance depends on the average transmission power. Therefore, by controlling the peak power to be high when the duty is low and by reducing the peak power when the duty is high, it is possible to keep the average transmission power constant.

Embodiment 3 FIG. 3 is a block diagram showing a third embodiment of the present invention.
4 is the same as the first embodiment.

In the radar device configured as described above, the transmission power control command unit 14 inputs the relative distance information with respect to the target output from the relative distance calculation unit 4, and outputs n information in accordance with the relative distance from the target. And determines the individual phase control amounts of the phase shifters 10, and outputs a transmission power control signal to the n phase shifters 10.
Here, the transmission power control command unit 14 controls the transmission power to a minimum value necessary for stably tracking the target,
The power control amount is calculated by Expression 4. Here, PT is the transmission power of the transmitter, R is the relative distance from the target output by the relative distance calculation unit 4, and G is the antenna gain of the antenna 1 when transmitting.
T, GR is the antenna gain at the time of reception, λ is the wavelength of the transmission signal, σ is the effective reflection area of a target input from the outside, and PR is the minimum reception power required to stably track the target.
0, the power control amount is ΔATT.

[0035]

(Equation 4)

The transmission power control command unit 14 has a table of power control amount versus phase control amount, and uses a phase control amount corresponding to the power control amount calculated by equation 4 as a transmission power control command signal. Output to n phase shifters 10.

The n phase shifters 10 correspond to the transmission power control command unit 1
4, a transmission power control command signal is input, and according to the transmission power control command signal, the phase of the input pulse wave is changed.
Output to the amplifiers 11.

The received power of the radar decreases as the relative distance to the target increases, and increases as the relative distance decreases. The transmission power control command section 14 receives information on the relative distance to the target output from the relative distance calculation section 4 and outputs n pieces of phase shifters 10 to obtain the minimum reception power necessary for tracking the target.
Is determined and the transmission power is controlled. Therefore, it is possible to output the minimum transmission power required for tracking the target.

Embodiment 4 FIG. 4 is a block diagram showing Embodiment 4 of the present invention.
4 is the same as the first embodiment. Reference numeral 15 denotes an atmospheric pressure sensor.

In the radar device configured as described above, the transmission power control command unit 14 receives the pressure information output from the pressure sensor 15 and outputs the n number of phase shifters 10 according to the pressure.
Is determined, and a transmission power control signal is output to the n phase shifters 10.

The transmission power control command section 14 has a table of the atmospheric pressure vs. withstand power characteristic of the radar apparatus according to the present invention. , The difference between the transmission power and the withstand power is calculated as the power control amount.

The transmission power control command unit 14 has a table of power control amount versus phase control amount, and uses a phase control amount corresponding to the power control amount as a transmission power control command signal to generate n phase shift signals. Output to the container 10.

The n phase shifters 10 correspond to the transmission power control command unit 1
4, a transmission power control command signal is input, and according to the transmission power control command signal, the phase of the input pulse wave is changed.
Output to the amplifiers 11.

The withstand power of the high-frequency component decreases as the atmospheric pressure decreases, and discharge and destruction are more likely to occur. Therefore, since the transmission power is controlled based on the atmospheric pressure information output by the atmospheric pressure sensor 15, the transmission power can be increased within a range in which the high-frequency component does not discharge or break.

Embodiment 5 FIG. FIG. 5 is a block diagram showing Embodiment 5 of the present invention.
4 is the same as the first embodiment. Reference numeral 16 denotes a command transmission unit.

In the radar device configured as described above, the transmission power control command section 14 inputs the weather information output from the command transmission section 16 and individually controls the n phase shifters 10 according to the weather conditions. The phase control amount is determined, and n phase shifters 1
The transmission power control signal is output to 0.

The transmission power control command section 14 has a table of transmission power characteristics for keeping the detection performance relative to the humidity and rainfall of the radar apparatus according to the present invention constant. ), The difference between the transmission power and the transmission power at which the detection performance becomes constant is calculated as the power control amount by referring to the transmission power for making the detection performance constant.

The transmission power control command section 14 has a table of power control amount vs. phase control amount, and uses the phase control amount corresponding to the power control amount as a transmission power control command signal to generate n phase shift signals. Output to the container 10.

The n phase shifters 10 correspond to the transmission power control command unit 1
4, a transmission power control command signal is input, and according to the transmission power control command signal, the phase of the input pulse wave is changed.
Output to the amplifiers 11.

The detection performance of a radar depends on the humidity and rainfall of the atmosphere. If the humidity is high or the amount of rainfall is large, the atmospheric decay rate increases, and the detection performance deteriorates. Since the weather information output from the command transmitting unit 16 is input and the transmission power is controlled according to the humidity and the rainfall, the detection performance can be stabilized regardless of the atmospheric humidity and the rainfall.

Embodiment 6 FIG. FIG. 6 is a block diagram showing Embodiment 6 of the present invention.
4 is the same as the first embodiment. Reference numeral 17 denotes a signal-to-noise ratio calculation unit.

In the radar device configured as described above, the signal-to-noise ratio calculation unit 17 receives the video signal output from the receiver 3 and divides the noise level from the signal level of the video signal to obtain a signal-to-noise ratio. The noise ratio is calculated and output to the transmission power control command unit 14. Transmission power control command unit 14
Inputs the signal-to-noise ratio, and calculates the power control amount by Equation 5 so that the signal-to-noise ratio becomes constant. Here, it is assumed that the input signal-to-noise ratio is SN, the target value of the signal-to-noise ratio for constant control is SNC, the coefficient is k, and the power control amount is ΔATT. The target value SNC is given by operational requirements as a minimum signal-to-noise ratio necessary for stably tracking the target.

[0053]

(Equation 5)

Further, the transmission power control command section 14 has a table of power control amount versus phase control amount, and uses a phase control amount corresponding to the power control amount calculated by equation 5 as a transmission power control command signal. Output to n phase shifters 10.

The n phase shifters 10 correspond to the transmission power control command unit 1
4, a transmission power control command signal is input, and according to the transmission power control command signal, the phase of the input pulse wave is changed.
Output to the amplifiers 11.

The transmission power control command section 14 receives the signal-to-noise ratio and controls the transmission power so that the signal-to-noise ratio required to stably track the target is minimized. Stable tracking can be performed with limited transmission power.

Embodiment 7 FIG. FIG. 7 is a block diagram showing a seventh embodiment of the present invention.
4 is the same as the first embodiment. Reference numeral 18 denotes a signal-to-interference ratio calculation unit.

In the radar device configured as described above, the signal-to-interference ratio calculator 18 calculates the signal-to-interference ratio and outputs it to the transmission power control command unit 14. Transmit power P
T, the antenna gain when transmitting the antenna 1 is GT, the antenna gain when receiving is GR, the wavelength of the transmission signal is λ, the receiver 3
Is BR, the effective reflection area of the target input from the outside is σ, the relative distance to the target is R, the transmission power of the interference wave source is PJ, the antenna gain of the interference wave source is GJ, the interference wave emission Assuming that the relative distance to the source is RJ and the bandwidth of the interference wave is BJ, the target level S and the interference wave level J are obtained by Equations 6 and 7, and the interference level J is divided by the target level S. Calculate the signal-to-interference ratio.

[0059]

(Equation 6)

[0060]

(Equation 7)

The transmission power control command unit 14 receives the signal-to-interference ratio, and calculates the power control amount according to equation 8 so that the signal-to-interference ratio becomes constant. Here, the input signal-to-interference ratio is SJ, the target value of the signal-to-noise ratio for constant control is SJC, the coefficient is k, and the power control amount is ΔATT. The target value SJC is given as a minimum signal-to-interference ratio required for stable tracking of the target from operational requirements.

[0062]

(Equation 8)

The transmission power control command section 14 has a table of power control amount versus phase control amount, and uses a phase control amount corresponding to the power control amount calculated by equation 8 as a transmission power control command signal. Output to n phase shifters 10.

The n number of phase shifters 10 correspond to the transmission power control
4, a transmission power control command signal is input, and according to the transmission power control command signal, the phase of the input pulse wave is changed.
Output to the amplifiers 11.

The transmission power control command section 14 receives the signal-to-interference ratio and controls the transmission power so that the signal-to-interference ratio becomes the minimum necessary for stably tracking the target. It is possible to perform stable tracking with a necessary minimum transmission power.

[0066]

According to the first aspect of the present invention, it is possible to prevent a decrease in the transmission output due to a change in temperature and a lapse of time, and it becomes unnecessary to transmit more power than necessary. Can be prevented, and confidentiality can be improved.

According to the second aspect of the present invention, the transmission average power can be kept constant, so that it is not necessary to transmit more power than necessary, so that confidentiality can be improved. Discharge and destruction can be prevented.

According to the third aspect of the present invention, the transmission power is controlled to a minimum value required for tracking in accordance with the relative distance to the target, so that confidentiality can be improved. Discharge and destruction can be prevented.

According to the fourth aspect of the present invention, since the transmission power is controlled in accordance with the withstand power of the high-frequency component due to the atmospheric pressure, the detection performance can be improved without discharging and destroying the high-frequency component.

According to the fifth aspect of the present invention, since the transmission power is controlled in accordance with the humidity and the rainfall, the detection performance can be stabilized, and the humidity in the atmosphere is low, and the transmission power is small in fine weather. Therefore, confidentiality can be improved.

According to the sixth aspect of the present invention, the transmission power is controlled so that the signal-to-noise ratio is constant, so that the transmission power can be minimized, the confidentiality can be improved, and the tracking can be stabilized. Can be achieved.

According to the seventh aspect of the present invention, the transmission power is controlled so that the signal-to-interference ratio becomes constant, so that the transmission power can be minimized, the confidentiality can be improved, and the tracking can be improved. Stabilization can be achieved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of a radar apparatus according to the present invention.

FIG. 2 is a diagram showing a second embodiment of the radar device according to the present invention;

FIG. 3 is a diagram showing a third embodiment of the radar device according to the present invention;

FIG. 4 is a diagram showing a fourth embodiment of the radar apparatus according to the present invention;

FIG. 5 is a diagram showing a fifth embodiment of the radar apparatus according to the present invention;

FIG. 6 is a diagram showing a sixth embodiment of the radar apparatus according to the present invention;

FIG. 7 is a diagram showing a seventh embodiment of the radar apparatus according to the present invention;

FIG. 8 is a diagram showing a conventional radar device.

[Explanation of symbols]

1 antenna, 2 circulator, 3 receiver, 4
Relative distance calculator, 5 modulation code generator, 6 oscillator, 7 pulse modulator, 8 transmitter, 9n distributor, 1
0 phase shifter, 11 amplifier, 12n combiner, 13 transmission power monitoring unit, 14 transmission power control command unit, 15 barometric pressure sensor, 16 command transmission unit, 17 signal to noise ratio calculation unit, 18 signal to interference ratio calculation Department.

Claims (7)

[Claims] 1. An antenna that radiates radio waves into space as a transmission signal and receives a reflected wave from a target as a reception signal, a receiver that receives a reception signal output from the antenna and outputs a video signal, Connected to the above receiver,
A relative distance calculator for calculating a relative distance to a target from a video signal; a modulation code generator for generating a modulation code; an oscillator for generating a transmission signal; and the oscillator connected to the oscillator and the modulation code generator. And a pulse modulator that outputs a transmission signal that is pulse-modulated according to the modulation code generated by the modulation code generation unit, and a transmission power monitor signal that controls the transmission power. A transmission power control command section for outputting a transmission power control command signal; a transmitter connected to the pulse modulator and the transmission power control command section for inputting, amplifying and outputting a transmission signal output by the pulse modulator; And a transmission signal output from the transmitter, and an output power value of the transmitter as a transmission power monitor signal as the transmission power control command unit. A transmission power monitoring unit for outputting the signal; and the transmitter further connected to the n-divider for distributing an input signal from the pulse modulator to n (n is an integer of 2 or more); N phase shifters that can individually control the phase of the signal by the transmission power control command signal, and n amplifiers connected to the n phase shifters and amplifying the output of the phase shifter; Connected to the n amplifiers,
A radar apparatus comprising: an n combiner that combines and outputs an input signal by n. 2. An antenna that radiates radio waves into space as a transmission signal and receives a reflected wave from a target as a reception signal, a receiver that receives a reception signal output from the antenna and outputs a video signal, Connected to the above receiver,
A relative distance calculator for calculating a relative distance to a target from a video signal; a modulation code generator for generating a modulation code; an oscillator for generating a transmission signal; and the oscillator connected to the oscillator and the modulation code generator. A pulse modulator that outputs a transmission signal that is pulse-modulated according to the modulation code generated by the modulation code generator, and is connected to the modulation code generator, and inputs a modulation code. A transmission power control command unit that outputs a transmission power control command signal for controlling transmission power, and a transmitter that outputs a transmission signal output by the pulse modulator to the antenna, and the transmitter further includes:
An n-divider for distributing an input signal from the pulse modulator to n (n is an integer of 2 or more); and an n-divider connected to the n-divider and individually controlling the signal phase by the transmission power control command signal. N possible phase shifters, n amplifiers connected to the n phase shifters for amplifying the output of the phase shifter, and n connected to the n amplifiers, for combining n input signals and outputting A radar device comprising: 3. An antenna that radiates radio waves into space as a transmission signal and receives a reflected wave from a target as a reception signal, a receiver that receives a reception signal output from the antenna and outputs a video signal, Connected to the above receiver,
A relative distance calculator for calculating a relative distance to a target from a video signal; a modulation code generator for generating a modulation code; an oscillator for generating a transmission signal; and the oscillator connected to the oscillator and the modulation code generator. A pulse modulator that outputs a transmission signal that is pulse-modulated according to the modulation code generated by the modulation code generation unit, and is connected to the relative distance calculation unit, and inputs relative distance information. A transmission power control command unit that outputs a transmission power control command signal for controlling transmission power, and is connected to the pulse modulator and the transmission power control command unit, and receives a transmission signal output by the pulse modulator. And a transmitter that amplifies and outputs the amplified signal to the antenna,
Further, the transmitter includes an n-divider for distributing an input signal from the pulse modulator to n (n is an integer of 2 or more);
N number of phase shifters connected to the distributor and capable of individually controlling the phase of the signal by the transmission power control command signal, and connected to the n number of phase shifters to amplify the output of the phase shifter A radar apparatus comprising: n amplifiers; and an n combiner connected to the n amplifiers and combining and outputting n input signals. 4. An antenna that radiates radio waves into space as a transmission signal and receives a reflected wave from a target as a reception signal, a receiver that receives a reception signal output from the antenna and outputs a video signal, Connected to the above receiver,
A relative distance calculator for calculating a relative distance to a target from a video signal; a modulation code generator for generating a modulation code; an oscillator for generating a transmission signal; and the oscillator connected to the oscillator and the modulation code generator. A pulse modulator that outputs a transmission signal that is pulse-modulated in accordance with a modulation code generated by the modulation code generation unit while receiving a transmission signal generated by the modulation code generation unit, an air pressure sensor that measures air pressure, and outputs pressure information, A transmission power control command unit that inputs pressure information from a pressure sensor and outputs a transmission power control command signal for controlling transmission power, and a transmission signal that is output by the pulse modulator, and amplifies and transmits the antenna. And a transmitter for outputting the input signal from the pulse modulator to n (n is an integer of 2 or more). And n phase shifters connected to the n divider and capable of individually controlling the phase of the signal by the transmission power control command signal, and a phase shifter connected to the n phase shifters And n amplifiers connected to the n amplifiers for amplifying the output of n and synthesizing and outputting the input signal by n. 5. An antenna that radiates radio waves into space as a transmission signal and receives a reflected wave from a target as a reception signal, a receiver that receives a reception signal output from the antenna and outputs a video signal, Connected to the above receiver,
A relative distance calculator for calculating a relative distance to a target from a video signal; a modulation code generator for generating a modulation code; an oscillator for generating a transmission signal; and the oscillator connected to the oscillator and the modulation code generator. A pulse modulator that outputs a transmission signal that is pulse-modulated according to a modulation code generated by the modulation code generation unit, a command transmission unit that transmits weather information, and a command transmission unit that transmits weather information. A transmission power control command unit for inputting weather information and outputting a transmission power control command signal for controlling transmission power; and the pulse modulator connected to the pulse modulator and the transmission power control command unit. And a transmitter that inputs a transmission signal output by the transmitter, amplifies and outputs the amplified signal to the antenna, and the transmitter further includes:
An n-divider for distributing an input signal from the pulse modulator to n (n is an integer of 2 or more); and an n-divider connected to the n-divider and individually controlling the signal phase by the transmission power control command signal. N possible phase shifters, n amplifiers connected to the n phase shifters for amplifying the output of the phase shifter, and n connected to the n amplifiers, for combining n input signals and outputting A radar device comprising: 6. An antenna that radiates radio waves into space as a transmission signal and receives a reflected wave from a target as a reception signal, a receiver that receives a reception signal output from the antenna and outputs a video signal, Connected to the above receiver,
A relative distance calculator for calculating a relative distance to a target from a video signal; a modulation code generator for generating a modulation code; an oscillator for generating a transmission signal; and the oscillator connected to the oscillator and the modulation code generator. A pulse modulator that outputs a transmission signal that is pulse-modulated according to a modulation code generated by the modulation code generation unit, and is connected to the receiver,
A signal-to-noise ratio calculator for calculating the signal-to-noise ratio of the received signal, and a signal-to-noise ratio connected to the signal-to-noise ratio calculator, inputting a signal-to-noise ratio, and transmitting a transmission power control command signal for controlling transmission power. A transmission power control command unit to be output, a transmitter connected to the pulse modulator and the transmission power control command unit, receiving a transmission signal output by the pulse modulator, amplifying the signal, and outputting the amplified signal to the antenna. The transmitter further includes an n-divider for distributing an input signal from the pulse modulator to n (n is an integer of 2 or more), and an n-divider connected to the n-divider. N phase shifters capable of controlling the phase of, n amplifiers connected to the n phase shifters and amplifying the output of the phase shifter, connected to the n amplifiers, It is composed of an n combiner that combines n input signals and outputs them. Radar apparatus, characterized in that it is. 7. An antenna that radiates radio waves into space as a transmission signal and receives a reflected wave from a target as a reception signal, a receiver that receives a reception signal output from the antenna and outputs a video signal, Connected to the above receiver,
A relative distance calculator for calculating a relative distance to a target from a video signal; a modulation code generator for generating a modulation code; an oscillator for generating a transmission signal; and the oscillator connected to the oscillator and the modulation code generator. A pulse modulator that outputs a transmission signal that is pulse-modulated according to a modulation code generated by the modulation code generation unit, and is connected to the receiver,
A signal-to-interference ratio calculator for calculating the signal-to-interference ratio of the received signal; and a transmission power for controlling the transmission power, which is connected to the signal-to-interference ratio calculator and inputs the signal-to-interference ratio. A transmission power control command section that outputs a control command signal, and a transmission signal that is connected to the pulse modulator and the transmission power control command section, receives a transmission signal output by the pulse modulator, amplifies the signal, and outputs the amplified signal to the antenna. And a transmitter for distributing an input signal from the pulse modulator to n (n is an integer of 2 or more), the transmitter being connected to the n divider, and a transmission power control command signal. N phase shifters that can individually control the phase of a signal, n amplifiers connected to the n phase shifters, and amplifying the output of the phase shifter, and the n amplifiers , An n combiner that combines n input signals and outputs Radar apparatus, characterized in that it is composed of.