Compression coefficient calculation device and radar device

Abstract

To reduce a sidelobe level by compensating for distortion components of a power amplifier on a transmission side.SOLUTION: A compression coefficient calculation device uses an inverse matrix of a monitor signal based on a transmission signal after amplification processing output from a transmission signal amplifier 25, and a pulse compression result of a transmission signal before the amplification processing to calculate a pulse compression coefficient that causes the pulse compression result when the monitor signal is pulse-compressed, and supplies the pulse compression coefficient to a pulse compression unit 44 that performs pulse compression processing on a received signal.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a compression coefficient calculation device and a radar device, and more particularly to a technique suitable for application to a radar device that performs pulse compression processing.

Background Art

[0002] As one type of solid-state radar device, a pulse compression radar device is known (see Patent Document 1). By using pulse compression technology, it is possible to achieve a long detection range and high resolution even in a solid-state transmitter with low peak power.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in pulse compression processing, there is a problem that side lobes are generated, and when they appear in the range direction, false detection of targets occurs. When the correlation between the transmission signal (and the pulse compression coefficient created based on the transmission signal) and the reception signal decreases, the side lobe level increases. As a factor, distortion by the power amplifier on the transmission side can be cited. That is, the transmission waveform is distorted by the power amplifier on the transmission side and radiated / transmitted from the antenna, so that when received, the correlation between the transmission signal (pulse compression coefficient) and the reception signal decreases, and the side lobe level increases.

[0005] Therefore, an object of the present invention is to provide a compression coefficient calculation device and a radar device capable of reducing the side lobe level by compensating for the distortion component of the power amplifier on the transmission side.

Means for Solving the Problems

[0006] In order to solve the above problems, the compression coefficient calculation device according to the present invention calculates a pulse compression coefficient that becomes the pulse compression result when the monitor signal is pulse-compressed using the inverse matrix of the monitor signal based on the amplified transmission signal output from the transmission signal amplifier and the pulse compression result in the transmission signal before amplification processing, and supplies the pulse compression coefficient to a pulse compression unit that performs pulse compression processing on the received signal. Let the inverse matrix of the monitor signal be Mon -1 and the matrix representing the pulse compression result be Comp_i. Then, the matrix Coef_d of the pulse compression coefficient is calculated by Coef_d = Mon -1 ·Comp_i. It is characterized by this.

[0008] The radar device according to the present invention is characterized by including the compression coefficient calculation device as described above.

Effect of the Invention

[0009] According to the compression coefficient calculation device of the present invention, since the pulse compression coefficient is calculated using the monitor signal based on the amplified transmission signal output from the transmission signal amplifier and the pulse compression result in the transmission signal before amplification processing, it is possible to compensate for the distortion component of the power amplifier on the transmission side (i.e., the transmission signal amplifier), reduce the side lobe level, and thus improve the range side lobe (in other words, eliminate the influence of the range side lobe) and improve the performance of, for example, a radar.

[0010] According to the compression coefficient calculation device of the present invention, also, even when the distortion characteristics of the power amplifier on the transmission side (i.e., the transmission signal amplifier) change due to aging or the like, it is possible to compensate for the distortion component of the power amplifier on the transmission side (i.e., the transmission signal amplifier) and reduce the side lobe level only by updating and supplying the distortion compensation compression coefficient, that is, without stopping transmission and reception. Therefore, it is possible to continuously reduce the side lobe level by compensating for the distortion component without requiring maintenance work (that is, while maintaining the operating state of, for example, a radar device).

[0011] According to the radar device of the present invention, in a radar device that performs pulse compression processing, the above-described operational effects can be achieved.

Brief Description of the Drawings

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DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, the present invention will be described based on the illustrated embodiments. In the following, the characteristic configurations of the present invention will be described, and the mechanisms similar to those of the prior art as a radar device will be briefly described or the description will be omitted. Also, in each figure, the signal line for transmitting the real part (I signal; in other words, in-phase component, I signal component) constituting the complex signal and the signal line for transmitting the imaginary part (Q signal; in other words, quadrature component, Q signal component) are collectively shown as one signal line.

[0014] FIG. 1 is a functional block diagram showing a schematic configuration of a signal processing mechanism 1 of a radar device in an embodiment including a compression coefficient calculation device 3 according to an embodiment of the present invention. The signal processing mechanism 1 of the radar device in the embodiment includes a transmission signal processing unit 2, a reception signal processing unit 4 including a compression coefficient calculation device 3, a circulator 5, and an antenna 6, and has a numerically controlled oscillator 7 and a local oscillator 8 as mechanisms that cooperate with the transmission signal processing unit 2, the compression coefficient calculation device 3, and the reception signal processing unit 4.

[0015] The signal processing mechanism 1 of the radar device can be incorporated into various radar devices that emit / transmit pulsed radio waves (or pulsed signals) and then capture / receive reflected waves from targets (also called target signals, etc.). Specific examples of radar devices into which the signal processing mechanism 1 of the radar device can be incorporated include, for example, weather radar devices and harbor surveillance radar devices.

[0016] The numerical control oscillator 7 generates and outputs a sine wave sin(f,φ0) signal and a cosine wave cos(f,φ0) signal according to a predetermined oscillator frequency f and an initial phase φ0.

[0017] The local oscillator 8 generates and outputs a local signal having a predetermined local frequency.

[0018] (Transmission signal processing unit) The transmission signal processing unit 2 is a mechanism for generating a transmission signal and sending it to the antenna 6, and includes a transmission type signal generator 21, a complex multiplier 22, a D / A converter 23, a transmission side mixer 24, and a transmission signal amplifier 25.

[0019] The transmission type signal generator 21 generates and outputs a transmission type signal (specifically, a pulse signal / pulse waveform, the in-phase component I signal and the quadrature component Q signal in complex form; note that it is a digital signal) at a predetermined time interval (or a predetermined transmission period).

[0020] The complex multiplier 22 receives the input of the transmission type signal output from the transmission type signal generator 21 and the input of the sine wave sin(f,φ0) signal and the cosine wave cos(f,φ0) signal output from the numerical control oscillator 7, performs mixing using the I signal, which is the in-phase component of the transmission type signal, and the sine wave sin(f,φ0) signal, and also performs mixing using the Q signal, which is the quadrature component of the transmission type signal, and the cosine wave cos(f,φ0) signal, and outputs the transmission type signal after the mixing process.

[0021] The D / A converter 23 (Digital to Analog converter) receives the input of the transmitted signal after mixing processing output from the complex multiplier 22 (which is a digital signal), converts the transmitted signal into an analog signal, and outputs it as a transmission signal.

[0022] The transmission-side mixer 24 receives the input of the transmission signal (which is an Intermediate Frequency: IF) output from the D / A converter 23 and also receives the input of the local signal output from the local oscillator 8. By mixing the transmission signal and the local signal, the transmission signal is frequency-converted to a high frequency (Radio Frequency: RF) (i.e., up-converted from the intermediate frequency to the high frequency) and output.

[0023] Note that a plurality of combinations of the local oscillator 8 and the transmission-side mixer 24 may be provided so that frequency conversion processing in multiple stages is performed.

[0024] The transmission signal amplifier 25 is specifically composed of a power amplifier. It receives the input of the transmission signal output from the transmission-side mixer 24, amplifies the transmission signal to a predetermined signal level, and outputs it.

[0025] The circulator 5 receives the input of the amplified transmission signal output from the transmission signal processing unit 2 (specifically, the transmission signal amplifier 25) and also receives the input of the received high-frequency signal output from the antenna 6. It switches between the transmission of the transmission signal from the transmission signal processing unit 2 (specifically, the transmission signal amplifier 25) to the antenna 6 during transmission and the transmission of the received high-frequency signal from the antenna 6 to the reception signal processing unit 4 during reception.

[0026] The antenna 6 receives the input of the transmission signal output from the circulator 5, radiates / transmits the transmission signal into space (as a pulsed radio wave / pulse signal), and captures / receives the reflected wave signal that returns after being reflected by the target and outputs it as a received high-frequency signal.

[0027] (Receiving signal processing unit) The receiving signal processing unit 4 is a mechanism for capturing the received high-frequency signal output from the antenna 6, frequency-converting the received high-frequency signal, and converting it into a digital signal for signal processing, and includes a receiving mixer 41, an A / D converter 42, an orthogonal detector 43, and a pulse compression unit 44.

[0028] The receiving mixer 41 receives the input of the received high-frequency signal output from the circulator 5 and the input of the local signal output from the local oscillator 8, and frequency-converts (i.e., down-converts from a high frequency to an intermediate frequency) the received high-frequency signal into a received intermediate-frequency signal by mixing the received high-frequency signal and the local signal, and outputs it.

[0029] Similar to the transmitting signal processing unit 2, a plurality of combinations of the local oscillator 8 and the receiving mixer 41 may be provided so that frequency conversion processing in multiple stages is performed.

[0030] The A / D converter 42 (Analog to Digital converter) receives the input of the received intermediate-frequency signal (which is an analog signal) output from the receiving mixer 41, and converts the received intermediate-frequency signal into a digital signal and outputs it.

[0031] The orthogonal detector 43 receives the input of the digitally converted received intermediate-frequency signal output from the A / D converter 42 and the input of the sine wave sin(f,φ0) signal or the cosine wave cos(f,φ0) signal output from the numerically controlled oscillator 7, and performs orthogonal detection on the received intermediate-frequency signal and outputs it. Specifically, the orthogonal detector 43 generates a complex signal composed of an I signal in phase with the received intermediate-frequency signal and a Q signal having a phase difference of π / 2 from the received intermediate-frequency signal, and outputs it as a received signal.

[0032] The pulse compression unit 44 is specifically configured to include an FIR filter (abbreviation for Finite Impulse Response), receives the input of a received signal which is a complex signal composed of the in-phase I signal and the quadrature Q signal output from the quadrature detector 43, and also receives the input of the distortion compensation compression coefficient output from the inverse matrix calculation unit 36 of the compression coefficient calculation device 3. Using the distortion compensation compression coefficient, it performs pulse compression processing (i.e., pulse width compression processing) on the received signal, and generates and outputs the I signal and Q signal after the pulse compression processing.

[0033] (Compression Coefficient Calculation Device) The compression coefficient calculation device 3 according to the embodiment uses the inverse matrix of the monitor signal based on the transmitted signal after the amplification process output from the transmission signal amplifier 25 and the pulse compression result in the transmitted signal before the amplification process to calculate the pulse compression coefficient that becomes the pulse compression result when the monitor signal is pulse compressed, and supplies the pulse compression coefficient to the pulse compression unit 44 that performs the pulse compression processing on the received signal.

[0034] The compression coefficient calculation device 3 is a mechanism for compensating for the distortion component according to the distortion characteristics of the transmission signal amplifier 25 to reduce the side lobe level, and includes a compensation mixer 31, an A / D converter 32, a quadrature detector 33, an ideal result calculation unit 34, an ideal result storage unit 35, and an inverse matrix calculation unit 36.

[0035] Note that the ideal result calculation unit 34, the ideal result storage unit 35, and the inverse matrix calculation unit 36 may be configured using, for example, a DSP (abbreviation for Digital Signal Processor).

[0036] The compensation mixer 31 receives the input of the transmitted signal after the amplification process (which is a high frequency) output from the transmission signal processing unit 2 (specifically, the transmission signal amplifier 25), and also receives the input of the local signal output from the local oscillator 8. By mixing the transmitted signal and the local signal, it frequency-converts (i.e., down-converts from a high frequency to an intermediate frequency) the transmitted signal into an intermediate frequency signal and outputs it.

[0037] Note that, similar to the transmission signal processing unit 2, a plurality of combinations of the local oscillator 8 and the compensation mixer 31 may be provided so that frequency conversion processing in multiple stages is performed.

[0038] The A / D converter 32 receives the input of the intermediate frequency signal (which is an analog signal) output from the compensation mixer 31, and converts the intermediate frequency signal into a digital signal and outputs it.

[0039] The quadrature detector 33 receives the input of the digitally converted intermediate frequency signal output from the A / D converter 32 and also receives the input of the sine wave sin(f, φ0) signal or the cosine wave cos(f, φ0) signal output from the numerically controlled oscillator 7, and performs quadrature detection on the intermediate frequency signal and outputs it. Specifically, the quadrature detector 33 generates and outputs a complex signal composed of an I signal in phase with the intermediate frequency signal and a Q signal having a phase difference of π / 2 from the intermediate frequency signal. The complex signal output from the quadrature detector 33 of the compression coefficient calculator 3 is referred to as an "amplified output monitor signal".

[0040] The amplified output monitor signal output from the quadrature detector 33 is a transmission waveform / reception waveform distorted by the amplification process by the transmission signal amplifier 25 (in other words, including a distortion component according to the distortion characteristics of the transmission signal amplifier 25).

[0041] The ideal result calculation unit 34 calculates and outputs the pulse compression result in an ideal reception waveform (reception signal) without distortion accompanying the amplification process by the transmission signal amplifier 25. The pulse compression result output from the ideal result calculation unit 34 is referred to as an "ideal pulse compression result". The ideal reception waveform (reception signal) is, that is, the transmission type signal output from the transmission type signal generator 21, that is, the transmission signal before the amplification process.

[0042] The ideal result storage unit 35 is configured as a storage area having a function of storing various data and the like, receives the input of the ideal pulse compression result output from the ideal result calculation unit 34, and stores the ideal pulse compression result.

[0043] Upon receiving the input of the amplified output monitor signal output from the quadrature detector 33 and referring to the ideal pulse compression result stored in the ideal result storage unit 35, the inverse matrix calculation unit 36 calculates and outputs, by inverse matrix calculation, a pulse compression coefficient such that when the amplified output monitor signal (i.e., the transmission waveform / reception waveform distorted by the amplification process of the transmission signal amplifier 25) is pulse-compressed, it becomes the ideal pulse compression result (i.e., the pulse compression result in the transmission waveform / ideal reception waveform that has no distortion due to the amplification process by the transmission signal amplifier 25 because it is before the amplification process). The pulse compression coefficient output from the inverse matrix calculation unit 36 is referred to as the "distortion compensation compression coefficient."

[0044] Here, the pulse compression result by the pulse compression unit 44 (specifically, the FIR filter) is calculated according to the following mathematical formula 1. (Equation 1) Comp = Rx·Coef Here, Comp: Pulse compression result Rx: Received signal Coef: Pulse compression coefficient

[0045] The above mathematical formula 1 is represented in matrix form as the following mathematical formula 2. In the following mathematical formula 2, l d represents the received data length, and l represents the filter tap number.

Equation

[0046] And the pulse compression coefficient Coef can be calculated as follows in mathematical formula 3 using the inverse matrix Rx -1 of the received signal Rx. (Equation 3) Comp = Rx·Coef Rx -1 ·Comp = Rx -1 ·Rx·Coef Rx -1 ·Comp = Coef

[0047] Therefore, assuming that the pulse compression result Comp is the ideal pulse compression result Comp_i and the received signal Rx is the amplified output monitor signal Mon (inverse matrix: Mon -1 ), the distortion compensation compression coefficient Coef_d is obtained according to the following formula (4) as a pulse compression coefficient that results in the ideal pulse compression result (i.e., the pulse compression result in the transmitted waveform / ideal received waveform without the distortion associated with the amplification process by the transmission signal amplifier 25 because it is before the amplification process) when the amplified output monitor signal (i.e., the transmitted / received waveform distorted by the amplification process by the transmission signal amplifier 25) is pulse compressed. (Equation 4) Coef_d = Mon -1 ·Comp_i

[0048] The distortion compensation compression coefficient calculated by the inverse matrix calculation unit 36 is obtained by back-calculating the amplified output monitor signal (see FIGS. 3 and 6), which is the transmitted / received waveform distorted by the amplification process by the transmission signal amplifier 25 (in other words, including the distortion component corresponding to the distortion characteristics of the transmission signal amplifier 25), so that it becomes the ideal pulse compression result for the ideal received waveform (i.e., the transmitted waveform) (i.e., the pulse compression result in the transmitted waveform / ideal received waveform without the distortion associated with the amplification process by the transmission signal amplifier 25 because it is before the amplification process; see FIGS. 3, 4, and 5). Therefore, it is a pulse compression coefficient that compensates for the distortion component corresponding to the distortion characteristics of the transmission signal amplifier 25 (see FIGS. 3 and 7).

[0049] For this reason, by using the distortion compensation compression coefficient, pulse compression is also performed on the received waveform (received signal) distorted by the amplification process by the transmission signal amplifier 25 as a signal with the distortion component compensated, and the side lobe level is improved (see FIGS. 3 and 8).

[0050] In the example shown in FIG. 8, by using a compression coefficient (i.e., a distortion compensation compression coefficient) that compensates for the distortion component, the side lobe level is reduced by about 25 dB as compared with the case where a compression coefficient that does not compensate for the distortion component is used. Regarding FIGS. 4 to 8, the amplified output monitor signal is the actual observation result, and the pulse compression result is the calculation result by simulation. Further, FIG. 8 shows the result of normalizing the maximum values of each of the case where a compression coefficient (i.e., a distortion compensation compression coefficient) that compensates for the distortion component is used and the case where a compression coefficient that does not compensate for the distortion component is used to 0.

[0051] The distortion compensation compression coefficient calculated by the inverse matrix calculation unit 36 is supplied to the pulse compression unit 44 of the reception signal processing unit 4.

[0052] The pulse compression unit 44 performs pulse compression processing on the reception signal, which is a complex signal composed of the in-phase I signal and the quadrature Q signal output from the quadrature detector 43, using the distortion compensation compression coefficient output from the inverse matrix calculation unit 36, and outputs the signal after the pulse compression processing.

[0053] Note that the configuration after the reception signal processing unit 4, in other words, the method of using the signal after the pulse compression processing output from the pulse compression unit 44, is not an essential configuration or method of use in this invention, and there can be various configurations and methods of use, so specific descriptions are omitted. However, for example, the signal processing mechanism 1 including the compression coefficient calculation device 3 is incorporated into the weather radar device, and a well-known predetermined process is performed on the signal after the pulse compression processing output from the reception signal processing unit 4 (specifically, the pulse compression unit 44) to generate a display signal, which is input to a display device (not shown), and it is considered that the display device displays it as a radar image (in other words, an echo image).

[0054] (Operation) Next, the processing procedure of the signal processing mechanism 1 of the radar device in the embodiment including the compression coefficient calculation device 3 configured as described above will be described with reference to FIG. 2 as well.

[0055] The transmission type signal output from the transmission type signal generator 21 (specifically, the I signal which is the in-phase component and the Q signal which is the quadrature component of the complex form of the pulse signal / pulse waveform; note that it is a digital signal) is mixed by the complex multiplier 22 and converted into an analog signal by the D / A converter 23 and output as a transmission signal (step S1).

[0056] The transmission signal output from the D / A converter 23 is frequency-converted (i.e., up-converted) from the intermediate frequency (IF) to the high frequency (RF) by the transmission-side mixer 24 and output (step S2).

[0057] The transmission signal output from the transmission-side mixer 24 is amplified by the transmission signal amplifier 25 and output (step S3). At this time, the transmission signal is distorted by the amplification process of the transmission signal amplifier 25.

[0058] The transmission signal after the amplification process output from the transmission signal amplifier 25 (note that it is at a high frequency) is frequency-converted (i.e., down-converted) to the intermediate frequency by the compensation mixer 31, then converted into a digital signal by the A / D converter 32, and quadrature-detected by the quadrature detector 33, and the complex signal (i.e., the I signal and the Q signal) is supplied to the inverse matrix operation unit 36 as the amplified output monitor signal (step S4).

[0059] The inverse matrix operation unit 36 calculates the pulse compression coefficient that results in the ideal pulse compression result when the amplified output monitor signal is pulse-compressed and outputs it as the distortion compensation compression coefficient (step S5).

[0060] The distortion compensation compression coefficient output from the inverse matrix operation unit 36 is used and the pulse compression process of the received signal is performed by the pulse compression unit 44 (step S6).

[0061] Note that the calculation and output of the distortion compensation compression coefficient by the inverse matrix operation unit 36 (in other words, the update of the distortion compensation compression coefficient) may be performed manually or automatically.

[0062] Also, the interval at which the inverse matrix calculation unit 36 calculates and outputs the distortion compensation compression coefficient (in other words, updates the distortion compensation compression coefficient) is not limited to a specific time length. For example, it is considered that the distortion compensation compression coefficient that appropriately corresponds to changes in the distortion characteristics of the transmission signal amplifier 25 due to aging deterioration or the like is used so that the pulse compression processing of the received signal can be appropriately performed, and then it is appropriately set to an appropriate time length. Further, for example, when the side lobe level increases when intentionally receiving ground clutter, the calculation and output of the distortion compensation compression coefficient (in other words, the update of the distortion compensation compression coefficient) may be performed.

[0063] According to the compression coefficient calculation device 3 according to the embodiment, the pulse compression coefficient (that is, the distortion compensation compression coefficient) is calculated using the amplified output monitor signal based on the transmission signal after the amplification process output from the transmission signal amplifier 25 and the pulse compression result (that is, the ideal pulse compression result) in the transmission signal before the amplification process. Therefore, the distortion component of the transmission-side power amplifier (that is, the transmission signal amplifier 25) can be compensated, the side lobe level can be reduced, and consequently, the range side lobe can be improved (in other words, the influence of the range side lobe can be eliminated), and for example, the performance of the radar can be improved.

[0064] Hereinafter, as a verification example of the operation and effect of the compression coefficient calculation device according to the present invention, a verification example of the operation of the compression coefficient calculation device under conditions where the pulse length of the transmission pulse is different will be described with reference to FIGS. 9 to 11.

[0065] Figures 9 to 11 specifically show the amplified output monitor signal (Figure 9), the distortion compensation compression coefficient (Figure 10), and the pulse compression result (Figure 11) when the pulse lengths of the transmission type signals (transmission pulses) output from the transmission type signal generator 21 are 32 μs, 64 μs, and 128 μs, respectively. Note that for Figures 9 to 11, the amplified output monitor signal is the actual observed result, and the pulse compression result is the calculation result by simulation. Also, Figure 11 shows the result of normalizing to 0 the respective maximum values when using the pulse compression coefficient for compensating the distortion component (i.e., the distortion compensation compression coefficient) and when using the pulse compression coefficient without compensating the distortion component.

[0066] From the results shown in Figures 9 to 11, it is confirmed that regardless of the conditions of the pulse length of the transmission pulse, by using the distortion compensation compression coefficient calculated using the amplified output monitor signal, the side lobe level can be reduced.

[0067] According to the compression coefficient calculation device 3 according to the embodiment, also when the distortion characteristics of the power amplifier on the transmission side (i.e., the transmission signal amplifier 25) change due to aging deterioration or the like, only by updating and supplying the distortion compensation compression coefficient, that is, without stopping the transmission and reception, the distortion component of the power amplifier on the transmission side (i.e., the transmission signal amplifier 25) can be compensated to reduce the side lobe level. Therefore, it is possible to continuously reduce the side lobe level by compensating the distortion component without requiring maintenance work (i.e., while maintaining the operating state of the radar device, for example).

[0068] As described above, the embodiments of the present invention have been explained. However, the specific configuration is not limited to the above embodiments, and even if there are design changes or the like within the scope not departing from the gist of the present invention, they are included in the present invention.

[0069] Specifically, in the above-described embodiment, the compression coefficient calculation device 3 according to the present invention is incorporated into the signal processing mechanism 1 of the radar device (for example, a weather radar device) whose schematic configuration is shown in FIG. 1. However, the mechanism into which the compression coefficient calculation device according to the present invention can be incorporated is not limited to the signal processing mechanism 1 of the radar device whose schematic configuration is shown in FIG. 1, and the compression coefficient calculation device according to the present invention may be incorporated into other mechanisms.

[0070] Also, in the above-described embodiment, the ideal pulse compression result calculated by the ideal result calculation unit 34 is stored in the ideal result storage unit 35. However, the manner in which the ideal pulse compression result is provided is not limited to the mode in the above-described embodiment, and the ideal pulse compression result calculated outside the processing system of the compression coefficient calculation device 3 (furthermore, outside the processing system of the signal processing mechanism 1 of the radar device) may be taken in via a storage medium, a communication function, etc. and stored in the ideal result storage unit 35.

Explanation of Reference Numerals

[0071] 1 Signal processing mechanism of radar device 2 Transmission signal processing unit 21 Transmission type signal generator 22 Complex multiplier 23 D / A converter 24 Transmission side mixer 25 Transmission signal amplifier 3 Compression coefficient calculation device 31 Compensation mixer 32 A / D converter 33 Quadrature detector 34 Ideal result calculation unit 35 Ideal result storage unit 36 Inverse matrix operation unit 4 Reception signal processing unit 41 Reception side mixer 42 A / D converter 43 Quadrature detector 44 Pulse compression unit 5 Circulator 6 Antenna 7 Numerically controlled oscillator 8 Local Oscillator

Claims

1. Calculating a pulse compression coefficient that results in the pulse compression result when pulse-compressing the monitor signal using the inverse matrix of the monitor signal based on the amplified transmission signal output from the transmission signal amplifier and the pulse compression result in the transmission signal before the amplification process, supplying the pulse compression coefficient to a pulse compression unit that performs pulse compression processing on the received signal, wherein the inverse matrix of the monitor signal is set as Mon-1 and the matrix representing the pulse compression result is set as Comp_i, and the matrix Coef_d of the pulse compression coefficient is calculated by Coef_d = Mon-1 · Comp_i, a compression coefficient calculation device characterized by the above.

2. A radar device comprising the compression coefficient calculation device according to Claim 1, characterized by the above.

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