Orthogonal separation device and orthogonal separation method

• US 10,459,071 B2
• Filed: 08/26/2015
• Issued: 10/29/2019
• Est. Priority Date: 08/28/2014
• Status: Active Grant

• Current Assignee: Japan Radio Company Limited (Nisshinbo Holdings Incorporated)
• Original Assignee: Japan Radio Company Limited (Nisshinbo Holdings Incorporated)
• Inventors: Tokieda, Yukinobu, Matsumoto, Keiko
• Primary Examiner(s): Gregory, Bernarr E
• Application Number:
  US15/506,780
• Publication Number:
  US 20170254879A1
• Time in Patent Office: 1,525 Days
• Field of Search: None
• CPC Class Codes: G01S 13/325 using transmission of coded signals, e.g. P.S.K. signals
• CPC Class Codes: G01S 13/343 using sawtooth modulation
• CPC Class Codes: G01S 13/42 Simultaneous measurement of distance and other co-ordinates indirect measurement G01S13/46
• CPC Class Codes: G01S 7/0233 Avoidance by phase multiplex
• CPC Class Codes: G01S 7/352 Receivers
• CPC Class Codes: G01S 7/356 involving particularities of FFT processing
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas

Abstract

An orthogonal separation device of the invention includes a demodulator that performs a demodulation process corresponding to each of a plural number N of antennas for each of a plural number P (=M×N) of pulse waves (R11 to R1M), . . . , (RN1 to RNM) which arrives at the plural number N of antennas by transmitting, at the same time, a plural number M of pulse waves having phases ϕ₁ to ϕ_M set as different arrays of known discrete values and that generates a plural number P of demodulated signals (R′₁₁ to (R′_1M), . . . (R′_N1 to R′_NM), and includes a phase adjuster that adjusts difference among the phases of a plural number P of demodulated signals (R′₁₁ to R′_1M), . . . , (R′₁₁ to R′_NM) according to the arrays of known discrete values and generates a plural number P of in-phase signals (r11 to r1M), . . . , (rN1 to rNM).

Claims

1. An orthogonal separation device for processing P (=M×

N) pulse waves (R11 to R1M), . . . , (RN1 to RNM) which arrive at N antennas by M pulse waves being transmitted by respective transmitting antennas at the same time, the device comprising;

a wave detector that performs a wave detection process corresponding to each of the N antennas for each of the P pulse waves (R11 to R1M), . . . , (RN1 to RNM) and that generates P output signals (R′

11 to R′

1M), . . . , (R′

N1 to R′

NM), wherein a phase of each of the M pulse waves is modulated based on a value of one code that is included in a code array of known discrete values and the code array is different for each of the transmitting antennas; and

a demodulator that adjusts difference among the phases of the P output signals (R′

11 to R′

1M), . . . , (R′

N1 to R′

NM) according to the code arrays of known discrete values and generates P in-phase signals (r11 to r1M), . . . , (rN1 to rNM).

2. The orthogonal separation device according to claim 1, further comprising:

an integrator that integrates each combination of the in-phase signals (r11 to rN1), . . . , (r1M to rNM), of the P in-phase signals (r11 to r1M), . . . , (rN1 to rNM), corresponding to each pulse wave arriving at the N antennas and acquires received waves S1 to SN corresponding to the respective N antennas.

3. A multiple-input and multiple-output (MIMO) radar, comprising the orthogonal separation device according to claim 2,

wherein the wave detector extracts a distance when the wave detector performs the wave detection process for the pulse waves,

the integrator extracts a speed when the integrator integrates each combination of the in-phase signals, and

the MIMO radar further comprises a signal processor that extracts a azimuth angle based on the received waves.

4. The orthogonal separation device according to claim 1, wherein the adjusting the difference includes performing opposite phase demodulation of each of the P output signals, based on values of codes of the code arrays of known discrete values, in a corresponding temporal position.

5. A multiple-input and multiple-output (MIMO) radar, comprising the orthogonal separation device according to claim 1,

wherein the wave detector extracts a distance when the wave detector performs the wave detection process for the pulse waves.

6. An orthogonal separation method comprising:

performing a wave detection process corresponding to each of N antennas for each of P (=M×

N) pulse waves (R11 to R1M), . . . , (RN1 to RNM) and generating P output signals (R′

11 to R′

1M), . . . , (R′

N1 to R′

NM), wherein the P pulse waves (R11 to R1M), . . . , (RN1 to RNM) arrive at the N antennas by M pulse waves being transmitted by respective transmitting antennas at the same time, a phase of each of the M pulse waves is modulated based on a value of one code that is included in a code array of known discrete values and the code array is different for each of the transmitting antennas; and

adjusting difference among the phases of the P output signals (R′

11 to R′

1M), . . . , (R′

N1 to R′

NM) according to the code arrays of known discrete values and generating P in-phase signals (r11 to r1M), . . . , (rN1 to rNM).

7. The orthogonal separation method according to claim 6, further comprising:

integrating each combination of the in-phase signals (r11 to rN1), . . . , (r1M to rNM), of the P in-phase signals (r11 to r1M), . . . , (rN1 to rNM), corresponding to each pulse wave arriving at the N antennas, and acquiring received waves S1 to SN corresponding to the respective N antennas.