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

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...

AI Technical Summary

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-phase coded pulse train radar waveform, which solves the blind area problem of evenly spaced inter-pulse phase coded pulse trains

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