Multi-sector radar

Patent metadata

Field	Value
Publication number	US-9612324-B2
Application number	US-201414583353-A
Country	US
Kind code	B2
Filing date	Dec 26, 2014
Priority date	Jan 14, 2014
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

A transmission sequence generated by a first sector radar is a sequence obtained by multiplying a predetermined code sequence by a first orthogonalized code, and a transmission sequence generated by a second sector radar is a sequence obtained by multiplying a predetermined code sequence by a second orthogonalized code. A value obtained by multiplication of the ith element of the first orthogonalized code and the ith element of the second orthogonalized code is equal to the ith element of a fundamental sequence VV_2n having a length of 2n (n is an integer greater than or equal to 1). The fundamental sequence VV_2n includes a sub fundamental sequence VV_2(n−1) having a length of n and satisfies VV_2n={VV_2(n−1), −VV_2(n−1)} or {−VV_2(n−1), VV_2(n−1)}.

First claim

What is claimed is:

1. A multi-sector radar comprising:
a first sector radar including a first transmission-sequence generating unit that generates a first transmission sequence and a first transmitting unit that transmits the first transmission sequence; and
a second sector radar including a second transmission-sequence generating unit that generates a second transmission sequence and a second transmitting unit that transmits the second transmission sequence,
wherein the first transmission sequence is a sequence obtained by multiplying a first code sequence by a first orthogonalized code,
the second transmission sequence is a sequence obtained by multiplying a second code sequence by a second orthogonalized code,
an inner product sum of the first orthogonalized code and the second orthogonalized code is zero,
a value obtained by multiplication of an ith element (V 1 i ) of the first orthogonalized code and an ith element (V 2 i ) of the second orthogonalized code is equal to an ith element of a fundamental sequence VV_2n having a length of 2n, where i and n are an integer greater than or equal to 1, and
the fundamental sequence VV_2n includes a sub fundamental sequence VV_2(n−1) having a length of n, and the fundamental sequence VV_2n is equal to {VV_2(n−1), −VV_2(n−1)} or {−VV_2(n−1), VV_2(n−1)}.

2. The multi-sector radar according to claim 1 ,
wherein the first transmission-sequence generating unit comprises:
a first code output unit that outputs the first code sequence;
a first orthogonalized-code output unit that outputs a first orthogonalized code generated using the fundamental sequence VV_2n; and
a first multiplying unit that multiplies the first code sequence by the first orthogonalized code and outputs the first transmission sequence, and

wherein the second transmission-sequence generating unit comprises:
a second code output unit that outputs the second code sequence;
a second orthogonalized-code output unit that outputs a second orthogonalized code generated using the fundamental sequence VV_2n; and
a second multiplying unit that multiplies the second code sequence by the second orthogonalized code and outputs the second transmission sequence.

3. The multi-sector radar according to claim 2 ,
wherein the first code output unit repeatedly outputs the first code sequence a plurality of times;
the first multiplying unit multiplies one of the first code sequences by one element of the first orthogonalized code;
the second code output unit repeatedly outputs the second code sequence a plurality of times; and
the second multiplying unit multiplies one of the second code sequences by one element of the second orthogonalized code.

4. The multi-sector radar according to claim 2 ,
wherein the first code output unit repeatedly outputs the first code sequence a plurality of times, the first code sequence including a first sub code sequence;
the first multiplying unit multiplies each of the first code sequences by one element of the first orthogonalized code one-by-one;
the second code output unit repeatedly outputs the second code sequence a plurality of times, the second code sequence including a second sub code sequence; and
the second multiplying unit multiplies each of the second code sequences by one element of the second orthogonalized code one-by-one.

5. The multi-sector radar according to claim 2 ,
wherein the first code output unit repeatedly outputs the first code sequence a plurality of times, the first code sequence including a plurality of first sub code sequences;
the first multiplying unit multiplies each of the first sub code sequences by one element of the first orthogonalized code one-by-one;
the second code output unit repeatedly outputs the second code sequence a plurality of times, the second code sequence including a plurality of second sub code sequences; and
the second multiplying unit multiplies each of the second sub code sequences by one element of the second orthogonalized code one-by-one.

6. The multi-sector radar according to claim 2 ,
wherein the first code output unit repeatedly outputs a chirp signal a plurality of times, the chirp signal serving as the first code sequence;
the first multiplying unit multiplies each of the chirp signals by one element of the first orthogonalized code one-by-one;
the second code output unit repeatedly outputs the chirp signal a plurality of times, the chirp signal serving as the second code sequence; and
the second multiplying unit multiplies each of the chirp signals by one element of the second orthogonalized code one-by-one.

7. The multi-sector radar according to claim 2 ,
wherein the first code output unit repeatedly outputs a third code sequence n times and repeatedly outputs a fourth code sequence n times, the third code sequence is different from the fourth code sequence;
the first multiplying unit multiplies each of the third code sequences and each of the forth code sequences by one element of the first orthogonalized code one-by-one and;
the second code output unit repeatedly outputs a fifth code sequence n times and repeatedly outputs a sixth code sequence n times, the fifth code sequence is different from the sixth code sequence; and
the second multiplying unit multiplies one of the fifth code sequences and each of the sixth code sequences by one element of the second orthogonalized code one-by-one.

8. The multi-sector radar according to claim 2 ,
wherein the first code output unit outputs the first code sequence for every 2n repetition counts, the first code sequence including first N codes, where N is an integer greater than or equal to 1;
the first multiplying unit multiplies one code included in the first code sequence by one element of the first orthogonalized code one-by-one;
the second code output unit outputs the second code sequence for every 2n repetition counts, the second code sequence including second N codes; and
the second multiplying unit multiplies one code included in the second code sequence by one element of the second orthogonalized code one-by-one.

9. The multi-sector radar according to claim 2 ,
wherein the first code output unit repeatedly outputs the first code sequence 2n×2 times, the first code sequence including first N codes, where N is an integer greater than or equal to 1;
the first multiplying unit multiplies each of 2n first code sequences by one element of the first orthogonalized code one-by-one and multiplies each of the first N codes included in each of next 2n first code sequences by one element of a third orthogonalized code one-by-one;
the second code output unit repeatedly outputs the second code sequence 2n×2 times, the second code sequence including second N codes;
the second multiplying unit multiplies each of 2n second code sequences by one element of the second orthogonalized code one-by-one and multiplies each of second N codes included in each of next 2n second code sequences by one element of a fourth orthogonalized code one-by-one;
the third orthogonalized code is obtained by multiplying a N length sequence including repeated elements (+1, −1) by one element of the first orthogonalized codes one-by-one 2n times; and
the fourth orthogonalized code is obtained by multiplying the N length sequence including repeated elements (+1, −1) by the second orthogonalized code one-by-one 2n times.

10. The multi-sector radar according to claim 2 ,
wherein the first code output unit repeatedly outputs the first code sequence 2n×2 times, the first code sequence including first N codes, where N is an integer greater than or equal to 1;
the first multiplying unit multiplies each first code sequence by the first orthogonalized code and b

Assignees

• Panasonic Corp

Inventors

• Morita Tadashi
• Kishigami Takaaki

Classifications

• G01S7/023

  Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques (auxiliary means for detecting or identifying radar signals or the like G01S7/021; means for anti-jamming G01S7/36) · CPC title

• G01S13/284

  using coded pulses · CPC title

• G01S13/106 Primary

  using transmission of pulses having some particular characteristics (G01S13/12, G01S13/22, G01S13/24, G01S13/26, G01S13/28 and G01S13/30 take precedence) · CPC title