Bi-phase inter-pulse coded pulse train radar waveform with batch-to-batch diverse pulse recurrence interval (PRI)

A repeating period, two-phase encoding technology, applied in the field of radar waveforms, can solve the problems of evenly spaced inter-pulse phase encoding pulse train blind spots, etc., and achieve the effect of large unambiguous detection distance, low transmission power, and high distance resolution

Inactive Publication Date: 2013-04-24
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to provide a kind of inter-group staggered repetitive period inter-pulse two-pha

Method used

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  • Bi-phase inter-pulse coded pulse train radar waveform with batch-to-batch diverse pulse recurrence interval (PRI)
  • Bi-phase inter-pulse coded pulse train radar waveform with batch-to-batch diverse pulse recurrence interval (PRI)
  • Bi-phase inter-pulse coded pulse train radar waveform with batch-to-batch diverse pulse recurrence interval (PRI)

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Embodiment Construction

[0011] Below in conjunction with accompanying drawing and implementation process, the present invention is described in detail;

[0012] (1) Waveform generation process

[0013] See attached figure 1 , WIISS adopts inter-pulse two-phase coding interval transmission and reception system, and its detection waveform generation process is as follows: figure 1 shown. U ( n ) is a sequence with good periodic autocorrelation, such as m sequence, WG sequence, etc. U ( n ) autocorrelation function is written as:

[0014] Formula 1

[0015] According to the formula 1 in Whether to sequence length L modulo;

[0016] The transmitted signal waveform of the spaced transceiver radar constructed according to these sequences is:

[0017] Formula 2

[0018] (in Indicates the rounding operation, express yes L The modulo operation of T c Indicates the interval between two symbols, and T represents the maintenance time of each symbol) The WIISS system detects the ionospher...

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Abstract

A bi-phase inter-pulse coded pulse train radar waveform with a batch-to-batch diverse pulse recurrence interval (PRI) is characterized in that a pulse waveform has three different PRIs including a T[r1a], a T[r1b] and a T[r1c], and the pulse waveform further has three different sequence recurrence intervals (SRI) including a T[r2a], a T[r2b] and a T[r2c]. U[i] represents a code in a pulse, wherein i=0, ...L-1, and L equals to a length of a coded sequence; R[j] represents a sampling interval for echo receiving, j=0, ...N-1, and N equals to the number of echo range gates; T[p] represents a pulse width, t[b] represents a code width, and the pulse width T[p] equals to L*t[b]; and the R[j] equals to the t[b]. Therefore, the T[rs] of the PRI equal to the t[b], and namely, L+N coded pulses are transmitted circularly in a uniformly-spaced mode, and a space between two adjacent pulses is used for receiving. The bi-phase inter-pulse coded pulse train radar waveform with the batch-to-batch diverse PRI solves the dead zone problem of a even inter-pulse phase coded pulse string, and simultaneously has the advantages of high range resolution, high Doppler resolution, low transmitting power and the like of the even inter-pulse phase coded pulse string.

Description

technical field [0001] The present invention relates to a radar waveform, in particular to a radar waveform of two-phase coded burst radar waveform between pulses with inter-group staggered repetition period. Background technique [0002] Staggered pulse trains are often used in Moving Target Indication (MIT) Radar and Medium Pulse Repetition Frequency (MPRF) Radar. The former uses pulse-to-pulse PRI staggering), while the latter is in the form of batch-to-batch PRI diversity. These technologies are all to expand the radar's unambiguous detection range and unambiguous Doppler range, and reduce the range and speed measurement blind spots. For example, in MPRF radar, when there is a long-distance target whose echo delay is greater than the pulse repetition interval PRI, ranging ambiguity will occur. A common solution is to use several different PRI probes during a Dwell. The selection of PRI adopts remainder theorem, primary and secondary PRF selection method, M / N selection...

Claims

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Application Information

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IPC IPC(8): G01S7/28
Inventor 姚明白波张梁民武文俊
Owner NANCHANG UNIV
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